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/**********************************************************************
enum.c -
$Author$
created at: Fri Oct 1 15:15:19 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "id.h"
#include "internal.h"
#include "internal/compar.h"
#include "internal/enum.h"
#include "internal/hash.h"
#include "internal/imemo.h"
#include "internal/numeric.h"
#include "internal/object.h"
#include "internal/proc.h"
#include "internal/rational.h"
#include "internal/re.h"
#include "ruby/util.h"
#include "ruby_assert.h"
#include "symbol.h"
VALUE rb_mEnumerable;
static ID id_next;
static ID id__alone;
static ID id__separator;
static ID id_chunk_categorize;
static ID id_chunk_enumerable;
static ID id_sliceafter_enum;
static ID id_sliceafter_pat;
static ID id_sliceafter_pred;
static ID id_slicebefore_enumerable;
static ID id_slicebefore_sep_pat;
static ID id_slicebefore_sep_pred;
static ID id_slicewhen_enum;
static ID id_slicewhen_inverted;
static ID id_slicewhen_pred;
#define id_div idDiv
#define id_each idEach
#define id_eqq idEqq
#define id_cmp idCmp
#define id_lshift idLTLT
#define id_call idCall
#define id_size idSize
VALUE
rb_enum_values_pack(int argc, const VALUE *argv)
{
if (argc == 0) return Qnil;
if (argc == 1) return argv[0];
return rb_ary_new4(argc, argv);
}
#define ENUM_WANT_SVALUE() do { \
i = rb_enum_values_pack(argc, argv); \
} while (0)
static VALUE
enum_yield(int argc, VALUE ary)
{
if (argc > 1)
return rb_yield_force_blockarg(ary);
if (argc == 1)
return rb_yield(ary);
return rb_yield_values2(0, 0);
}
static VALUE
enum_yield_array(VALUE ary)
{
long len = RARRAY_LEN(ary);
if (len > 1)
return rb_yield_force_blockarg(ary);
if (len == 1)
return rb_yield(RARRAY_AREF(ary, 0));
return rb_yield_values2(0, 0);
}
static VALUE
grep_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
ENUM_WANT_SVALUE();
if (RTEST(rb_funcallv(memo->v1, id_eqq, 1, &i)) == RTEST(memo->u3.value)) {
rb_ary_push(memo->v2, i);
}
return Qnil;
}
static VALUE
grep_regexp_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
VALUE converted_element, match;
ENUM_WANT_SVALUE();
/* In case element can't be converted to a Symbol or String: not a match (don't raise) */
converted_element = SYMBOL_P(i) ? i : rb_check_string_type(i);
match = NIL_P(converted_element) ? Qfalse : rb_reg_match_p(memo->v1, i, 0);
if (match == memo->u3.value) {
rb_ary_push(memo->v2, i);
}
return Qnil;
}
static VALUE
grep_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
ENUM_WANT_SVALUE();
if (RTEST(rb_funcallv(memo->v1, id_eqq, 1, &i)) == RTEST(memo->u3.value)) {
rb_ary_push(memo->v2, enum_yield(argc, i));
}
return Qnil;
}
static VALUE
enum_grep0(VALUE obj, VALUE pat, VALUE test)
{
VALUE ary = rb_ary_new();
struct MEMO *memo = MEMO_NEW(pat, ary, test);
rb_block_call_func_t fn;
if (rb_block_given_p()) {
fn = grep_iter_i;
}
else if (RB_TYPE_P(pat, T_REGEXP) &&
LIKELY(rb_method_basic_definition_p(CLASS_OF(pat), idEqq))) {
fn = grep_regexp_i;
}
else {
fn = grep_i;
}
rb_block_call(obj, id_each, 0, 0, fn, (VALUE)memo);
return ary;
}
/*
* call-seq:
* grep(pattern) -> array
* grep(pattern) {|element| ... } -> array
*
* Returns an array of objects based elements of +self+ that match the given pattern.
*
* With no block given, returns an array containing each element
* for which <tt>pattern === element</tt> is +true+:
*
* a = ['foo', 'bar', 'car', 'moo']
* a.grep(/ar/) # => ["bar", "car"]
* (1..10).grep(3..8) # => [3, 4, 5, 6, 7, 8]
* ['a', 'b', 0, 1].grep(Integer) # => [0, 1]
*
* With a block given,
* calls the block with each matching element and returns an array containing each
* object returned by the block:
*
* a = ['foo', 'bar', 'car', 'moo']
* a.grep(/ar/) {|element| element.upcase } # => ["BAR", "CAR"]
*
* Related: #grep_v.
*/
static VALUE
enum_grep(VALUE obj, VALUE pat)
{
return enum_grep0(obj, pat, Qtrue);
}
/*
* call-seq:
* grep_v(pattern) -> array
* grep_v(pattern) {|element| ... } -> array
*
* Returns an array of objects based on elements of +self+
* that <em>don't</em> match the given pattern.
*
* With no block given, returns an array containing each element
* for which <tt>pattern === element</tt> is +false+:
*
* a = ['foo', 'bar', 'car', 'moo']
* a.grep_v(/ar/) # => ["foo", "moo"]
* (1..10).grep_v(3..8) # => [1, 2, 9, 10]
* ['a', 'b', 0, 1].grep_v(Integer) # => ["a", "b"]
*
* With a block given,
* calls the block with each non-matching element and returns an array containing each
* object returned by the block:
*
* a = ['foo', 'bar', 'car', 'moo']
* a.grep_v(/ar/) {|element| element.upcase } # => ["FOO", "MOO"]
*
* Related: #grep.
*/
static VALUE
enum_grep_v(VALUE obj, VALUE pat)
{
return enum_grep0(obj, pat, Qfalse);
}
#define COUNT_BIGNUM IMEMO_FL_USER0
#define MEMO_V3_SET(m, v) RB_OBJ_WRITE((m), &(m)->u3.value, (v))
static void
imemo_count_up(struct MEMO *memo)
{
if (memo->flags & COUNT_BIGNUM) {
MEMO_V3_SET(memo, rb_int_succ(memo->u3.value));
}
else if (++memo->u3.cnt == 0) {
/* overflow */
unsigned long buf[2] = {0, 1};
MEMO_V3_SET(memo, rb_big_unpack(buf, 2));
memo->flags |= COUNT_BIGNUM;
}
}
static VALUE
imemo_count_value(struct MEMO *memo)
{
if (memo->flags & COUNT_BIGNUM) {
return memo->u3.value;
}
else {
return ULONG2NUM(memo->u3.cnt);
}
}
static VALUE
count_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
struct MEMO *memo = MEMO_CAST(memop);
ENUM_WANT_SVALUE();
if (rb_equal(i, memo->v1)) {
imemo_count_up(memo);
}
return Qnil;
}
static VALUE
count_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
struct MEMO *memo = MEMO_CAST(memop);
if (RTEST(rb_yield_values2(argc, argv))) {
imemo_count_up(memo);
}
return Qnil;
}
static VALUE
count_all_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
struct MEMO *memo = MEMO_CAST(memop);
imemo_count_up(memo);
return Qnil;
}
/*
* call-seq:
* count -> integer
* count(object) -> integer
* count {|element| ... } -> integer
*
* Returns the count of elements, based on an argument or block criterion, if given.
*
* With no argument and no block given, returns the number of elements:
*
* [0, 1, 2].count # => 3
* {foo: 0, bar: 1, baz: 2}.count # => 3
*
* With argument +object+ given,
* returns the number of elements that are <tt>==</tt> to +object+:
*
* [0, 1, 2, 1].count(1) # => 2
*
* With a block given, calls the block with each element
* and returns the number of elements for which the block returns a truthy value:
*
* [0, 1, 2, 3].count {|element| element < 2} # => 2
* {foo: 0, bar: 1, baz: 2}.count {|key, value| value < 2} # => 2
*
*/
static VALUE
enum_count(int argc, VALUE *argv, VALUE obj)
{
VALUE item = Qnil;
struct MEMO *memo;
rb_block_call_func *func;
if (argc == 0) {
if (rb_block_given_p()) {
func = count_iter_i;
}
else {
func = count_all_i;
}
}
else {
rb_scan_args(argc, argv, "1", &item);
if (rb_block_given_p()) {
rb_warn("given block not used");
}
func = count_i;
}
memo = MEMO_NEW(item, 0, 0);
rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
return imemo_count_value(memo);
}
static VALUE
find_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
ENUM_WANT_SVALUE();
if (RTEST(enum_yield(argc, i))) {
struct MEMO *memo = MEMO_CAST(memop);
MEMO_V1_SET(memo, i);
memo->u3.cnt = 1;
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* find(if_none_proc = nil) {|element| ... } -> object or nil
* find(if_none_proc = nil) -> enumerator
*
* Returns the first element for which the block returns a truthy value.
*
* With a block given, calls the block with successive elements of the collection;
* returns the first element for which the block returns a truthy value:
*
* (0..9).find {|element| element > 2} # => 3
*
* If no such element is found, calls +if_none_proc+ and returns its return value.
*
* (0..9).find(proc {false}) {|element| element > 12} # => false
* {foo: 0, bar: 1, baz: 2}.find {|key, value| key.start_with?('b') } # => [:bar, 1]
* {foo: 0, bar: 1, baz: 2}.find(proc {[]}) {|key, value| key.start_with?('c') } # => []
*
* With no block given, returns an \Enumerator.
*
*/
static VALUE
enum_find(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
VALUE if_none;
if_none = rb_check_arity(argc, 0, 1) ? argv[0] : Qnil;
RETURN_ENUMERATOR(obj, argc, argv);
memo = MEMO_NEW(Qundef, 0, 0);
rb_block_call(obj, id_each, 0, 0, find_i, (VALUE)memo);
if (memo->u3.cnt) {
return memo->v1;
}
if (!NIL_P(if_none)) {
return rb_funcallv(if_none, id_call, 0, 0);
}
return Qnil;
}
static VALUE
find_index_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
struct MEMO *memo = MEMO_CAST(memop);
ENUM_WANT_SVALUE();
if (rb_equal(i, memo->v2)) {
MEMO_V1_SET(memo, imemo_count_value(memo));
rb_iter_break();
}
imemo_count_up(memo);
return Qnil;
}
static VALUE
find_index_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
{
struct MEMO *memo = MEMO_CAST(memop);
if (RTEST(rb_yield_values2(argc, argv))) {
MEMO_V1_SET(memo, imemo_count_value(memo));
rb_iter_break();
}
imemo_count_up(memo);
return Qnil;
}
/*
* call-seq:
* find_index(object) -> integer or nil
* find_index {|element| ... } -> integer or nil
* find_index -> enumerator
*
* Returns the index of the first element that meets a specified criterion,
* or +nil+ if no such element is found.
*
* With argument +object+ given,
* returns the index of the first element that is <tt>==</tt> +object+:
*
* ['a', 'b', 'c', 'b'].find_index('b') # => 1
*
* With a block given, calls the block with successive elements;
* returns the first element for which the block returns a truthy value:
*
* ['a', 'b', 'c', 'b'].find_index {|element| element.start_with?('b') } # => 1
* {foo: 0, bar: 1, baz: 2}.find_index {|key, value| value > 1 } # => 2
*
* With no argument and no block given, returns an \Enumerator.
*
*/
static VALUE
enum_find_index(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo; /* [return value, current index, ] */
VALUE condition_value = Qnil;
rb_block_call_func *func;
if (argc == 0) {
RETURN_ENUMERATOR(obj, 0, 0);
func = find_index_iter_i;
}
else {
rb_scan_args(argc, argv, "1", &condition_value);
if (rb_block_given_p()) {
rb_warn("given block not used");
}
func = find_index_i;
}
memo = MEMO_NEW(Qnil, condition_value, 0);
rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
return memo->v1;
}
static VALUE
find_all_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
ENUM_WANT_SVALUE();
if (RTEST(enum_yield(argc, i))) {
rb_ary_push(ary, i);
}
return Qnil;
}
static VALUE
enum_size(VALUE self, VALUE args, VALUE eobj)
{
return rb_check_funcall_default(self, id_size, 0, 0, Qnil);
}
static long
limit_by_enum_size(VALUE obj, long n)
{
unsigned long limit;
VALUE size = rb_check_funcall(obj, id_size, 0, 0);
if (!FIXNUM_P(size)) return n;
limit = FIX2ULONG(size);
return ((unsigned long)n > limit) ? (long)limit : n;
}
static int
enum_size_over_p(VALUE obj, long n)
{
VALUE size = rb_check_funcall(obj, id_size, 0, 0);
if (!FIXNUM_P(size)) return 0;
return ((unsigned long)n > FIX2ULONG(size));
}
/*
* call-seq:
* select {|element| ... } -> array
* select -> enumerator
*
* Returns an array containing elements selected by the block.
*
* With a block given, calls the block with successive elements;
* returns an array of those elements for which the block returns a truthy value:
*
* (0..9).select {|element| element % 3 == 0 } # => [0, 3, 6, 9]
* a = {foo: 0, bar: 1, baz: 2}.select {|key, value| key.start_with?('b') }
* a # => {:bar=>1, :baz=>2}
*
* With no block given, returns an \Enumerator.
*
* Related: #reject.
*/
static VALUE
enum_find_all(VALUE obj)
{
VALUE ary;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, find_all_i, ary);
return ary;
}
static VALUE
filter_map_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
i = rb_yield_values2(argc, argv);
if (RTEST(i)) {
rb_ary_push(ary, i);
}
return Qnil;
}
/*
* call-seq:
* filter_map {|element| ... } -> array
* filter_map -> enumerator
*
* Returns an array containing truthy elements returned by the block.
*
* With a block given, calls the block with successive elements;
* returns an array containing each truthy value returned by the block:
*
* (0..9).filter_map {|i| i * 2 if i.even? } # => [0, 4, 8, 12, 16]
* {foo: 0, bar: 1, baz: 2}.filter_map {|key, value| key if value.even? } # => [:foo, :baz]
*
* When no block given, returns an \Enumerator.
*
*/
static VALUE
enum_filter_map(VALUE obj)
{
VALUE ary;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, filter_map_i, ary);
return ary;
}
static VALUE
reject_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
ENUM_WANT_SVALUE();
if (!RTEST(enum_yield(argc, i))) {
rb_ary_push(ary, i);
}
return Qnil;
}
/*
* call-seq:
* reject {|element| ... } -> array
* reject -> enumerator
*
* Returns an array of objects rejected by the block.
*
* With a block given, calls the block with successive elements;
* returns an array of those elements for which the block returns +nil+ or +false+:
*
* (0..9).reject {|i| i * 2 if i.even? } # => [1, 3, 5, 7, 9]
* {foo: 0, bar: 1, baz: 2}.reject {|key, value| key if value.odd? } # => {:foo=>0, :baz=>2}
*
* When no block given, returns an \Enumerator.
*
* Related: #select.
*/
static VALUE
enum_reject(VALUE obj)
{
VALUE ary;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, reject_i, ary);
return ary;
}
static VALUE
collect_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
rb_ary_push(ary, rb_yield_values2(argc, argv));
return Qnil;
}
static VALUE
collect_all(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
rb_ary_push(ary, rb_enum_values_pack(argc, argv));
return Qnil;
}
/*
* call-seq:
* map {|element| ... } -> array
* map -> enumerator
*
* Returns an array of objects returned by the block.
*
* With a block given, calls the block with successive elements;
* returns an array of the objects returned by the block:
*
* (0..4).map {|i| i*i } # => [0, 1, 4, 9, 16]
* {foo: 0, bar: 1, baz: 2}.map {|key, value| value*2} # => [0, 2, 4]
*
* With no block given, returns an \Enumerator.
*
*/
static VALUE
enum_collect(VALUE obj)
{
VALUE ary;
int min_argc, max_argc;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
ary = rb_ary_new();
min_argc = rb_block_min_max_arity(&max_argc);
rb_lambda_call(obj, id_each, 0, 0, collect_i, min_argc, max_argc, ary);
return ary;
}
static VALUE
flat_map_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
VALUE tmp;
i = rb_yield_values2(argc, argv);
tmp = rb_check_array_type(i);
if (NIL_P(tmp)) {
rb_ary_push(ary, i);
}
else {
rb_ary_concat(ary, tmp);
}
return Qnil;
}
/*
* call-seq:
* flat_map {|element| ... } -> array
* flat_map -> enumerator
*
* Returns an array of flattened objects returned by the block.
*
* With a block given, calls the block with successive elements;
* returns a flattened array of objects returned by the block:
*
* [0, 1, 2, 3].flat_map {|element| -element } # => [0, -1, -2, -3]
* [0, 1, 2, 3].flat_map {|element| [element, -element] } # => [0, 0, 1, -1, 2, -2, 3, -3]
* [[0, 1], [2, 3]].flat_map {|e| e + [100] } # => [0, 1, 100, 2, 3, 100]
* {foo: 0, bar: 1, baz: 2}.flat_map {|key, value| [key, value] } # => [:foo, 0, :bar, 1, :baz, 2]
*
* With no block given, returns an \Enumerator.
*
* Alias: #collect_concat.
*/
static VALUE
enum_flat_map(VALUE obj)
{
VALUE ary;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, flat_map_i, ary);
return ary;
}
/*
* call-seq:
* enum.to_a(*args) -> array
* enum.entries(*args) -> array
*
* Returns an array containing the items in <i>enum</i>.
*
* (1..7).to_a #=> [1, 2, 3, 4, 5, 6, 7]
* { 'a'=>1, 'b'=>2, 'c'=>3 }.to_a #=> [["a", 1], ["b", 2], ["c", 3]]
*
* require 'prime'
* Prime.entries 10 #=> [2, 3, 5, 7]
*/
static VALUE
enum_to_a(int argc, VALUE *argv, VALUE obj)
{
VALUE ary = rb_ary_new();
rb_block_call(obj, id_each, argc, argv, collect_all, ary);
return ary;
}
static VALUE
enum_hashify_into(VALUE obj, int argc, const VALUE *argv, rb_block_call_func *iter, VALUE hash)
{
rb_block_call(obj, id_each, argc, argv, iter, hash);
return hash;
}
static VALUE
enum_hashify(VALUE obj, int argc, const VALUE *argv, rb_block_call_func *iter)
{
return enum_hashify_into(obj, argc, argv, iter, rb_hash_new());
}
static VALUE
enum_to_h_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
ENUM_WANT_SVALUE();
return rb_hash_set_pair(hash, i);
}
static VALUE
enum_to_h_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
return rb_hash_set_pair(hash, rb_yield_values2(argc, argv));
}
/*
* call-seq:
* enum.to_h(*args) -> hash
* enum.to_h(*args) {...} -> hash
*
* Returns the result of interpreting <i>enum</i> as a list of
* <tt>[key, value]</tt> pairs.
*
* %i[hello world].each_with_index.to_h
* # => {:hello => 0, :world => 1}
*
* If a block is given, the results of the block on each element of
* the enum will be used as pairs.
*
* (1..5).to_h {|x| [x, x ** 2]}
* #=> {1=>1, 2=>4, 3=>9, 4=>16, 5=>25}
*/
static VALUE
enum_to_h(int argc, VALUE *argv, VALUE obj)
{
rb_block_call_func *iter = rb_block_given_p() ? enum_to_h_ii : enum_to_h_i;
return enum_hashify(obj, argc, argv, iter);
}
static VALUE
inject_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
{
struct MEMO *memo = MEMO_CAST(p);
ENUM_WANT_SVALUE();
if (memo->v1 == Qundef) {
MEMO_V1_SET(memo, i);
}
else {
MEMO_V1_SET(memo, rb_yield_values(2, memo->v1, i));
}
return Qnil;
}
static VALUE
inject_op_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
{
struct MEMO *memo = MEMO_CAST(p);
VALUE name;
ENUM_WANT_SVALUE();
if (memo->v1 == Qundef) {
MEMO_V1_SET(memo, i);
}
else if (SYMBOL_P(name = memo->u3.value)) {
const ID mid = SYM2ID(name);
MEMO_V1_SET(memo, rb_funcallv_public(memo->v1, mid, 1, &i));
}
else {
VALUE args[2];
args[0] = name;
args[1] = i;
MEMO_V1_SET(memo, rb_f_send(numberof(args), args, memo->v1));
}
return Qnil;
}
static VALUE
ary_inject_op(VALUE ary, VALUE init, VALUE op)
{
ID id;
VALUE v, e;
long i, n;
if (RARRAY_LEN(ary) == 0)
return init == Qundef ? Qnil : init;
if (init == Qundef) {
v = RARRAY_AREF(ary, 0);
i = 1;
if (RARRAY_LEN(ary) == 1)
return v;
}
else {
v = init;
i = 0;
}
id = SYM2ID(op);
if (id == idPLUS) {
if (RB_INTEGER_TYPE_P(v) &&
rb_method_basic_definition_p(rb_cInteger, idPLUS) &&
rb_obj_respond_to(v, idPLUS, FALSE)) {
n = 0;
for (; i < RARRAY_LEN(ary); i++) {
e = RARRAY_AREF(ary, i);
if (FIXNUM_P(e)) {
n += FIX2LONG(e); /* should not overflow long type */
if (!FIXABLE(n)) {
v = rb_big_plus(LONG2NUM(n), v);
n = 0;
}
}
else if (RB_TYPE_P(e, T_BIGNUM))
v = rb_big_plus(e, v);
else
goto not_integer;
}
if (n != 0)
v = rb_fix_plus(LONG2FIX(n), v);
return v;
not_integer:
if (n != 0)
v = rb_fix_plus(LONG2FIX(n), v);
}
}
for (; i < RARRAY_LEN(ary); i++) {
VALUE arg = RARRAY_AREF(ary, i);
v = rb_funcallv_public(v, id, 1, &arg);
}
return v;
}
/*
* call-seq:
* enum.inject(initial, sym) -> obj
* enum.inject(sym) -> obj
* enum.inject(initial) { |memo, obj| block } -> obj
* enum.inject { |memo, obj| block } -> obj
* enum.reduce(initial, sym) -> obj
* enum.reduce(sym) -> obj
* enum.reduce(initial) { |memo, obj| block } -> obj
* enum.reduce { |memo, obj| block } -> obj
*
* Combines all elements of <i>enum</i> by applying a binary
* operation, specified by a block or a symbol that names a
* method or operator.
*
* The <i>inject</i> and <i>reduce</i> methods are aliases. There
* is no performance benefit to either.
*
* If you specify a block, then for each element in <i>enum</i>
* the block is passed an accumulator value (<i>memo</i>) and the element.
* If you specify a symbol instead, then each element in the collection
* will be passed to the named method of <i>memo</i>.
* In either case, the result becomes the new value for <i>memo</i>.
* At the end of the iteration, the final value of <i>memo</i> is the
* return value for the method.
*
* If you do not explicitly specify an <i>initial</i> value for <i>memo</i>,
* then the first element of collection is used as the initial value
* of <i>memo</i>.
*
*
* # Sum some numbers
* (5..10).reduce(:+) #=> 45
* # Same using a block and inject
* (5..10).inject { |sum, n| sum + n } #=> 45
* # Multiply some numbers
* (5..10).reduce(1, :*) #=> 151200
* # Same using a block
* (5..10).inject(1) { |product, n| product * n } #=> 151200
* # find the longest word
* longest = %w{ cat sheep bear }.inject do |memo, word|
* memo.length > word.length ? memo : word
* end
* longest #=> "sheep"
*
*/
static VALUE
enum_inject(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
VALUE init, op;
rb_block_call_func *iter = inject_i;
ID id;
switch (rb_scan_args(argc, argv, "02", &init, &op)) {
case 0:
init = Qundef;
break;
case 1:
if (rb_block_given_p()) {
break;
}
id = rb_check_id(&init);
op = id ? ID2SYM(id) : init;
init = Qundef;
iter = inject_op_i;
break;
case 2:
if (rb_block_given_p()) {
rb_warning("given block not used");
}
id = rb_check_id(&op);
if (id) op = ID2SYM(id);
iter = inject_op_i;
break;
}
if (iter == inject_op_i &&
SYMBOL_P(op) &&
RB_TYPE_P(obj, T_ARRAY) &&
rb_method_basic_definition_p(CLASS_OF(obj), id_each)) {
return ary_inject_op(obj, init, op);
}
memo = MEMO_NEW(init, Qnil, op);
rb_block_call(obj, id_each, 0, 0, iter, (VALUE)memo);
if (memo->v1 == Qundef) return Qnil;
return memo->v1;
}
static VALUE
partition_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, arys))
{
struct MEMO *memo = MEMO_CAST(arys);
VALUE ary;
ENUM_WANT_SVALUE();
if (RTEST(enum_yield(argc, i))) {
ary = memo->v1;
}
else {
ary = memo->v2;
}
rb_ary_push(ary, i);
return Qnil;
}
/*
* call-seq:
* enum.partition { |obj| block } -> [ true_array, false_array ]
* enum.partition -> an_enumerator
*
* Returns two arrays, the first containing the elements of
* <i>enum</i> for which the block evaluates to true, the second
* containing the rest.
*
* If no block is given, an enumerator is returned instead.
*
* (1..6).partition { |v| v.even? } #=> [[2, 4, 6], [1, 3, 5]]
*
*/
static VALUE
enum_partition(VALUE obj)
{
struct MEMO *memo;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
memo = MEMO_NEW(rb_ary_new(), rb_ary_new(), 0);
rb_block_call(obj, id_each, 0, 0, partition_i, (VALUE)memo);
return rb_assoc_new(memo->v1, memo->v2);
}
static VALUE
group_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
VALUE group;
VALUE values;
ENUM_WANT_SVALUE();
group = enum_yield(argc, i);
values = rb_hash_aref(hash, group);
if (!RB_TYPE_P(values, T_ARRAY)) {
values = rb_ary_new3(1, i);
rb_hash_aset(hash, group, values);
}
else {
rb_ary_push(values, i);
}
return Qnil;
}
/*
* call-seq:
* enum.group_by { |obj| block } -> a_hash
* enum.group_by -> an_enumerator
*
* Groups the collection by result of the block. Returns a hash where the
* keys are the evaluated result from the block and the values are
* arrays of elements in the collection that correspond to the key.
*
* If no block is given an enumerator is returned.
*
* (1..6).group_by { |i| i%3 } #=> {0=>[3, 6], 1=>[1, 4], 2=>[2, 5]}
*
*/
static VALUE
enum_group_by(VALUE obj)
{
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
return enum_hashify(obj, 0, 0, group_by_i);
}
static int
tally_up(st_data_t *group, st_data_t *value, st_data_t arg, int existing)
{
VALUE tally = (VALUE)*value;
VALUE hash = (VALUE)arg;
if (!existing) {
tally = INT2FIX(1);
}
else if (FIXNUM_P(tally) && tally < INT2FIX(FIXNUM_MAX)) {
tally += INT2FIX(1) & ~FIXNUM_FLAG;
}
else {
Check_Type(tally, T_BIGNUM);
tally = rb_big_plus(tally, INT2FIX(1));
RB_OBJ_WRITTEN(hash, Qundef, tally);
}
*value = (st_data_t)tally;
if (!SPECIAL_CONST_P(*group)) RB_OBJ_WRITTEN(hash, Qundef, *group);
return ST_CONTINUE;
}
static VALUE
rb_enum_tally_up(VALUE hash, VALUE group)
{
rb_hash_stlike_update(hash, group, tally_up, (st_data_t)hash);
return hash;
}
static VALUE
tally_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
ENUM_WANT_SVALUE();
rb_enum_tally_up(hash, i);
return Qnil;
}
/*
* call-seq:
* enum.tally -> a_hash
* enum.tally(a_hash) -> a_hash
*
* Tallies the collection, i.e., counts the occurrences of each element.
* Returns a hash with the elements of the collection as keys and the
* corresponding counts as values.
*
* ["a", "b", "c", "b"].tally #=> {"a"=>1, "b"=>2, "c"=>1}
*
* If a hash is given, the number of occurrences is added to each value
* in the hash, and the hash is returned. The value corresponding to
* each element must be an integer.
*/
static VALUE
enum_tally(int argc, VALUE *argv, VALUE obj)
{
VALUE hash;
if (rb_check_arity(argc, 0, 1)) {
hash = rb_convert_type(argv[0], T_HASH, "Hash", "to_hash");
rb_check_frozen(hash);
}
else {
hash = rb_hash_new();
}
return enum_hashify_into(obj, 0, 0, tally_i, hash);
}
NORETURN(static VALUE first_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, params)));
static VALUE
first_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, params))
{
struct MEMO *memo = MEMO_CAST(params);
ENUM_WANT_SVALUE();
MEMO_V1_SET(memo, i);
rb_iter_break();
UNREACHABLE_RETURN(Qnil);
}
static VALUE enum_take(VALUE obj, VALUE n);
/*
* call-seq:
* enum.first -> obj or nil
* enum.first(n) -> an_array
*
* Returns the first element, or the first +n+ elements, of the enumerable.
* If the enumerable is empty, the first form returns <code>nil</code>, and the
* second form returns an empty array.
*
* %w[foo bar baz].first #=> "foo"
* %w[foo bar baz].first(2) #=> ["foo", "bar"]
* %w[foo bar baz].first(10) #=> ["foo", "bar", "baz"]
* [].first #=> nil
* [].first(10) #=> []
*
*/
static VALUE
enum_first(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
rb_check_arity(argc, 0, 1);
if (argc > 0) {
return enum_take(obj, argv[0]);
}
else {
memo = MEMO_NEW(Qnil, 0, 0);
rb_block_call(obj, id_each, 0, 0, first_i, (VALUE)memo);
return memo->v1;
}
}
/*
* call-seq:
* enum.sort -> array
* enum.sort { |a, b| block } -> array
*
* Returns an array containing the items in <i>enum</i> sorted.
*
* Comparisons for the sort will be done using the items' own
* <code><=></code> operator or using an optional code block.
*
* The block must implement a comparison between +a+ and +b+ and return
* an integer less than 0 when +b+ follows +a+, +0+ when +a+ and +b+
* are equivalent, or an integer greater than 0 when +a+ follows +b+.
*
* The result is not guaranteed to be stable. When the comparison of two
* elements returns +0+, the order of the elements is unpredictable.
*
* %w(rhea kea flea).sort #=> ["flea", "kea", "rhea"]
* (1..10).sort { |a, b| b <=> a } #=> [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
*
* See also Enumerable#sort_by. It implements a Schwartzian transform
* which is useful when key computation or comparison is expensive.
*/
static VALUE
enum_sort(VALUE obj)
{
return rb_ary_sort_bang(enum_to_a(0, 0, obj));
}
#define SORT_BY_BUFSIZE 16
struct sort_by_data {
const VALUE ary;
const VALUE buf;
long n;
};
static VALUE
sort_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _data))
{
struct sort_by_data *data = (struct sort_by_data *)&MEMO_CAST(_data)->v1;
VALUE ary = data->ary;
VALUE v;
ENUM_WANT_SVALUE();
v = enum_yield(argc, i);
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
if (RARRAY_LEN(data->buf) != SORT_BY_BUFSIZE*2) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
RARRAY_ASET(data->buf, data->n*2, v);
RARRAY_ASET(data->buf, data->n*2+1, i);
data->n++;
if (data->n == SORT_BY_BUFSIZE) {
rb_ary_concat(ary, data->buf);
data->n = 0;
}
return Qnil;
}
static int
sort_by_cmp(const void *ap, const void *bp, void *data)
{
struct cmp_opt_data cmp_opt = { 0, 0 };
VALUE a;
VALUE b;
VALUE ary = (VALUE)data;
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
a = *(VALUE *)ap;
b = *(VALUE *)bp;
return OPTIMIZED_CMP(a, b, cmp_opt);
}
/*
* call-seq:
* enum.sort_by { |obj| block } -> array
* enum.sort_by -> an_enumerator
*
* Sorts <i>enum</i> using a set of keys generated by mapping the
* values in <i>enum</i> through the given block.
*
* The result is not guaranteed to be stable. When two keys are equal,
* the order of the corresponding elements is unpredictable.
*
* If no block is given, an enumerator is returned instead.
*
* %w{apple pear fig}.sort_by { |word| word.length }
* #=> ["fig", "pear", "apple"]
*
* The current implementation of #sort_by generates an array of
* tuples containing the original collection element and the mapped
* value. This makes #sort_by fairly expensive when the keysets are
* simple.
*
* require 'benchmark'
*
* a = (1..100000).map { rand(100000) }
*
* Benchmark.bm(10) do |b|
* b.report("Sort") { a.sort }
* b.report("Sort by") { a.sort_by { |a| a } }
* end
*
* <em>produces:</em>
*
* user system total real
* Sort 0.180000 0.000000 0.180000 ( 0.175469)
* Sort by 1.980000 0.040000 2.020000 ( 2.013586)
*
* However, consider the case where comparing the keys is a non-trivial
* operation. The following code sorts some files on modification time
* using the basic #sort method.
*
* files = Dir["*"]
* sorted = files.sort { |a, b| File.new(a).mtime <=> File.new(b).mtime }
* sorted #=> ["mon", "tues", "wed", "thurs"]
*
* This sort is inefficient: it generates two new File
* objects during every comparison. A slightly better technique is to
* use the Kernel#test method to generate the modification
* times directly.
*
* files = Dir["*"]
* sorted = files.sort { |a, b|
* test(?M, a) <=> test(?M, b)
* }
* sorted #=> ["mon", "tues", "wed", "thurs"]
*
* This still generates many unnecessary Time objects. A more
* efficient technique is to cache the sort keys (modification times
* in this case) before the sort. Perl users often call this approach
* a Schwartzian transform, after Randal Schwartz. We construct a
* temporary array, where each element is an array containing our
* sort key along with the filename. We sort this array, and then
* extract the filename from the result.
*
* sorted = Dir["*"].collect { |f|
* [test(?M, f), f]
* }.sort.collect { |f| f[1] }
* sorted #=> ["mon", "tues", "wed", "thurs"]
*
* This is exactly what #sort_by does internally.
*
* sorted = Dir["*"].sort_by { |f| test(?M, f) }
* sorted #=> ["mon", "tues", "wed", "thurs"]
*
* To produce the reverse of a specific order, the following can be used:
*
* ary.sort_by { ... }.reverse!
*/
static VALUE
enum_sort_by(VALUE obj)
{
VALUE ary, buf;
struct MEMO *memo;
long i;
struct sort_by_data *data;
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
if (RB_TYPE_P(obj, T_ARRAY) && RARRAY_LEN(obj) <= LONG_MAX/2) {
ary = rb_ary_new2(RARRAY_LEN(obj)*2);
}
else {
ary = rb_ary_new();
}
RBASIC_CLEAR_CLASS(ary);
buf = rb_ary_tmp_new(SORT_BY_BUFSIZE*2);
rb_ary_store(buf, SORT_BY_BUFSIZE*2-1, Qnil);
memo = MEMO_NEW(0, 0, 0);
data = (struct sort_by_data *)&memo->v1;
RB_OBJ_WRITE(memo, &data->ary, ary);
RB_OBJ_WRITE(memo, &data->buf, buf);
data->n = 0;
rb_block_call(obj, id_each, 0, 0, sort_by_i, (VALUE)memo);
ary = data->ary;
buf = data->buf;
if (data->n) {
rb_ary_resize(buf, data->n*2);
rb_ary_concat(ary, buf);
}
if (RARRAY_LEN(ary) > 2) {
RARRAY_PTR_USE(ary, ptr,
ruby_qsort(ptr, RARRAY_LEN(ary)/2, 2*sizeof(VALUE),
sort_by_cmp, (void *)ary));
}
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
for (i=1; i<RARRAY_LEN(ary); i+=2) {
RARRAY_ASET(ary, i/2, RARRAY_AREF(ary, i));
}
rb_ary_resize(ary, RARRAY_LEN(ary)/2);
RBASIC_SET_CLASS_RAW(ary, rb_cArray);
return ary;
}
#define ENUMFUNC(name) argc ? name##_eqq : rb_block_given_p() ? name##_iter_i : name##_i
#define MEMO_ENUM_NEW(v1) (rb_check_arity(argc, 0, 1), MEMO_NEW((v1), (argc ? *argv : 0), 0))
#define DEFINE_ENUMFUNCS(name) \
static VALUE enum_##name##_func(VALUE result, struct MEMO *memo); \
\
static VALUE \
name##_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo)) \
{ \
return enum_##name##_func(rb_enum_values_pack(argc, argv), MEMO_CAST(memo)); \
} \
\
static VALUE \
name##_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo)) \
{ \
return enum_##name##_func(rb_yield_values2(argc, argv), MEMO_CAST(memo)); \
} \
\
static VALUE \
name##_eqq(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo)) \
{ \
ENUM_WANT_SVALUE(); \
return enum_##name##_func(rb_funcallv(MEMO_CAST(memo)->v2, id_eqq, 1, &i), MEMO_CAST(memo)); \
} \
\
static VALUE \
enum_##name##_func(VALUE result, struct MEMO *memo)
#define WARN_UNUSED_BLOCK(argc) do { \
if ((argc) > 0 && rb_block_given_p()) { \
rb_warn("given block not used"); \
} \
} while (0)
DEFINE_ENUMFUNCS(all)
{
if (!RTEST(result)) {
MEMO_V1_SET(memo, Qfalse);
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* enum.all? [{ |obj| block } ] -> true or false
* enum.all?(pattern) -> true or false
*
* Passes each element of the collection to the given block. The method
* returns <code>true</code> if the block never returns
* <code>false</code> or <code>nil</code>. If the block is not given,
* Ruby adds an implicit block of <code>{ |obj| obj }</code> which will
* cause #all? to return +true+ when none of the collection members are
* +false+ or +nil+.
*
* If instead a pattern is supplied, the method returns whether
* <code>pattern === element</code> for every collection member.
*
* %w[ant bear cat].all? { |word| word.length >= 3 } #=> true
* %w[ant bear cat].all? { |word| word.length >= 4 } #=> false
* %w[ant bear cat].all?(/t/) #=> false
* [1, 2i, 3.14].all?(Numeric) #=> true
* [nil, true, 99].all? #=> false
* [].all? #=> true
*
*/
static VALUE
enum_all(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo = MEMO_ENUM_NEW(Qtrue);
WARN_UNUSED_BLOCK(argc);
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(all), (VALUE)memo);
return memo->v1;
}
DEFINE_ENUMFUNCS(any)
{
if (RTEST(result)) {
MEMO_V1_SET(memo, Qtrue);
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* enum.any? [{ |obj| block }] -> true or false
* enum.any?(pattern) -> true or false
*
* Passes each element of the collection to the given block. The method
* returns <code>true</code> if the block ever returns a value other
* than <code>false</code> or <code>nil</code>. If the block is not
* given, Ruby adds an implicit block of <code>{ |obj| obj }</code> that
* will cause #any? to return +true+ if at least one of the collection
* members is not +false+ or +nil+.
*
* If instead a pattern is supplied, the method returns whether
* <code>pattern === element</code> for any collection member.
*
* %w[ant bear cat].any? { |word| word.length >= 3 } #=> true
* %w[ant bear cat].any? { |word| word.length >= 4 } #=> true
* %w[ant bear cat].any?(/d/) #=> false
* [nil, true, 99].any?(Integer) #=> true
* [nil, true, 99].any? #=> true
* [].any? #=> false
*
*/
static VALUE
enum_any(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo = MEMO_ENUM_NEW(Qfalse);
WARN_UNUSED_BLOCK(argc);
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(any), (VALUE)memo);
return memo->v1;
}
DEFINE_ENUMFUNCS(one)
{
if (RTEST(result)) {
if (memo->v1 == Qundef) {
MEMO_V1_SET(memo, Qtrue);
}
else if (memo->v1 == Qtrue) {
MEMO_V1_SET(memo, Qfalse);
rb_iter_break();
}
}
return Qnil;
}
struct nmin_data {
long n;
long bufmax;
long curlen;
VALUE buf;
VALUE limit;
int (*cmpfunc)(const void *, const void *, void *);
int rev: 1; /* max if 1 */
int by: 1; /* min_by if 1 */
};
static VALUE
cmpint_reenter_check(struct nmin_data *data, VALUE val)
{
if (RBASIC(data->buf)->klass) {
rb_raise(rb_eRuntimeError, "%s%s reentered",
data->rev ? "max" : "min",
data->by ? "_by" : "");
}
return val;
}
static int
nmin_cmp(const void *ap, const void *bp, void *_data)
{
struct cmp_opt_data cmp_opt = { 0, 0 };
struct nmin_data *data = (struct nmin_data *)_data;
VALUE a = *(const VALUE *)ap, b = *(const VALUE *)bp;
#define rb_cmpint(cmp, a, b) rb_cmpint(cmpint_reenter_check(data, (cmp)), a, b)
return OPTIMIZED_CMP(a, b, cmp_opt);
#undef rb_cmpint
}
static int
nmin_block_cmp(const void *ap, const void *bp, void *_data)
{
struct nmin_data *data = (struct nmin_data *)_data;
VALUE a = *(const VALUE *)ap, b = *(const VALUE *)bp;
VALUE cmp = rb_yield_values(2, a, b);
cmpint_reenter_check(data, cmp);
return rb_cmpint(cmp, a, b);
}
static void
nmin_filter(struct nmin_data *data)
{
long n;
VALUE *beg;
int eltsize;
long numelts;
long left, right;
long store_index;
long i, j;
if (data->curlen <= data->n)
return;
n = data->n;
beg = RARRAY_PTR(data->buf);
eltsize = data->by ? 2 : 1;
numelts = data->curlen;
left = 0;
right = numelts-1;
#define GETPTR(i) (beg+(i)*eltsize)
#define SWAP(i, j) do { \
VALUE tmp[2]; \
memcpy(tmp, GETPTR(i), sizeof(VALUE)*eltsize); \
memcpy(GETPTR(i), GETPTR(j), sizeof(VALUE)*eltsize); \
memcpy(GETPTR(j), tmp, sizeof(VALUE)*eltsize); \
} while (0)
while (1) {
long pivot_index = left + (right-left)/2;
long num_pivots = 1;
SWAP(pivot_index, right);
pivot_index = right;
store_index = left;
i = left;
while (i <= right-num_pivots) {
int c = data->cmpfunc(GETPTR(i), GETPTR(pivot_index), data);
if (data->rev)
c = -c;
if (c == 0) {
SWAP(i, right-num_pivots);
num_pivots++;
continue;
}
if (c < 0) {
SWAP(i, store_index);
store_index++;
}
i++;
}
j = store_index;
for (i = right; right-num_pivots < i; i--) {
if (i <= j)
break;
SWAP(j, i);
j++;
}
if (store_index <= n && n <= store_index+num_pivots)
break;
if (n < store_index) {
right = store_index-1;
}
else {
left = store_index+num_pivots;
}
}
#undef GETPTR
#undef SWAP
data->limit = RARRAY_AREF(data->buf, store_index*eltsize); /* the last pivot */
data->curlen = data->n;
rb_ary_resize(data->buf, data->n * eltsize);
}
static VALUE
nmin_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _data))
{
struct nmin_data *data = (struct nmin_data *)_data;
VALUE cmpv;
ENUM_WANT_SVALUE();
if (data->by)
cmpv = enum_yield(argc, i);
else
cmpv = i;
if (data->limit != Qundef) {
int c = data->cmpfunc(&cmpv, &data->limit, data);
if (data->rev)
c = -c;
if (c >= 0)
return Qnil;
}
if (data->by)
rb_ary_push(data->buf, cmpv);
rb_ary_push(data->buf, i);
data->curlen++;
if (data->curlen == data->bufmax) {
nmin_filter(data);
}
return Qnil;
}
VALUE
rb_nmin_run(VALUE obj, VALUE num, int by, int rev, int ary)
{
VALUE result;
struct nmin_data data;
data.n = NUM2LONG(num);
if (data.n < 0)
rb_raise(rb_eArgError, "negative size (%ld)", data.n);
if (data.n == 0)
return rb_ary_new2(0);
if (LONG_MAX/4/(by ? 2 : 1) < data.n)
rb_raise(rb_eArgError, "too big size");
data.bufmax = data.n * 4;
data.curlen = 0;
data.buf = rb_ary_tmp_new(data.bufmax * (by ? 2 : 1));
data.limit = Qundef;
data.cmpfunc = by ? nmin_cmp :
rb_block_given_p() ? nmin_block_cmp :
nmin_cmp;
data.rev = rev;
data.by = by;
if (ary) {
long i;
for (i = 0; i < RARRAY_LEN(obj); i++) {
VALUE args[1];
args[0] = RARRAY_AREF(obj, i);
nmin_i(obj, (VALUE)&data, 1, args, Qundef);
}
}
else {
rb_block_call(obj, id_each, 0, 0, nmin_i, (VALUE)&data);
}
nmin_filter(&data);
result = data.buf;
if (by) {
long i;
RARRAY_PTR_USE(result, ptr, {
ruby_qsort(ptr,
RARRAY_LEN(result)/2,
sizeof(VALUE)*2,
data.cmpfunc, (void *)&data);
for (i=1; i<RARRAY_LEN(result); i+=2) {
ptr[i/2] = ptr[i];
}
});
rb_ary_resize(result, RARRAY_LEN(result)/2);
}
else {
RARRAY_PTR_USE(result, ptr, {
ruby_qsort(ptr, RARRAY_LEN(result), sizeof(VALUE),
data.cmpfunc, (void *)&data);
});
}
if (rev) {
rb_ary_reverse(result);
}
RBASIC_SET_CLASS(result, rb_cArray);
return result;
}
/*
* call-seq:
* enum.one? [{ |obj| block }] -> true or false
* enum.one?(pattern) -> true or false
*
* Passes each element of the collection to the given block. The method
* returns <code>true</code> if the block returns <code>true</code>
* exactly once. If the block is not given, <code>one?</code> will return
* <code>true</code> only if exactly one of the collection members is
* true.
*
* If instead a pattern is supplied, the method returns whether
* <code>pattern === element</code> for exactly one collection member.
*
* %w{ant bear cat}.one? { |word| word.length == 4 } #=> true
* %w{ant bear cat}.one? { |word| word.length > 4 } #=> false
* %w{ant bear cat}.one? { |word| word.length < 4 } #=> false
* %w{ant bear cat}.one?(/t/) #=> false
* [ nil, true, 99 ].one? #=> false
* [ nil, true, false ].one? #=> true
* [ nil, true, 99 ].one?(Integer) #=> true
* [].one? #=> false
*
*/
static VALUE
enum_one(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo = MEMO_ENUM_NEW(Qundef);
VALUE result;
WARN_UNUSED_BLOCK(argc);
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(one), (VALUE)memo);
result = memo->v1;
if (result == Qundef) return Qfalse;
return result;
}
DEFINE_ENUMFUNCS(none)
{
if (RTEST(result)) {
MEMO_V1_SET(memo, Qfalse);
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* enum.none? [{ |obj| block }] -> true or false
* enum.none?(pattern) -> true or false
*
* Passes each element of the collection to the given block. The method
* returns <code>true</code> if the block never returns <code>true</code>
* for all elements. If the block is not given, <code>none?</code> will return
* <code>true</code> only if none of the collection members is true.
*
* If instead a pattern is supplied, the method returns whether
* <code>pattern === element</code> for none of the collection members.
*
* %w{ant bear cat}.none? { |word| word.length == 5 } #=> true
* %w{ant bear cat}.none? { |word| word.length >= 4 } #=> false
* %w{ant bear cat}.none?(/d/) #=> true
* [1, 3.14, 42].none?(Float) #=> false
* [].none? #=> true
* [nil].none? #=> true
* [nil, false].none? #=> true
* [nil, false, true].none? #=> false
*/
static VALUE
enum_none(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo = MEMO_ENUM_NEW(Qtrue);
WARN_UNUSED_BLOCK(argc);
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(none), (VALUE)memo);
return memo->v1;
}
struct min_t {
VALUE min;
struct cmp_opt_data cmp_opt;
};
static VALUE
min_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct min_t *memo = MEMO_FOR(struct min_t, args);
ENUM_WANT_SVALUE();
if (memo->min == Qundef) {
memo->min = i;
}
else {
if (OPTIMIZED_CMP(i, memo->min, memo->cmp_opt) < 0) {
memo->min = i;
}
}
return Qnil;
}
static VALUE
min_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
VALUE cmp;
struct min_t *memo = MEMO_FOR(struct min_t, args);
ENUM_WANT_SVALUE();
if (memo->min == Qundef) {
memo->min = i;
}
else {
cmp = rb_yield_values(2, i, memo->min);
if (rb_cmpint(cmp, i, memo->min) < 0) {
memo->min = i;
}
}
return Qnil;
}
/*
* call-seq:
* enum.min -> obj
* enum.min { |a, b| block } -> obj
* enum.min(n) -> array
* enum.min(n) { |a, b| block } -> array
*
* Returns the object in _enum_ with the minimum value. The
* first form assumes all objects implement <code><=></code>;
* the second uses the block to return <em>a <=> b</em>.
*
* a = %w(albatross dog horse)
* a.min #=> "albatross"
* a.min { |a, b| a.length <=> b.length } #=> "dog"
*
* If the +n+ argument is given, minimum +n+ elements are returned
* as a sorted array.
*
* a = %w[albatross dog horse]
* a.min(2) #=> ["albatross", "dog"]
* a.min(2) {|a, b| a.length <=> b.length } #=> ["dog", "horse"]
* [5, 1, 3, 4, 2].min(3) #=> [1, 2, 3]
*/
static VALUE
enum_min(int argc, VALUE *argv, VALUE obj)
{
VALUE memo;
struct min_t *m = NEW_CMP_OPT_MEMO(struct min_t, memo);
VALUE result;
VALUE num;
if (rb_check_arity(argc, 0, 1) && !NIL_P(num = argv[0]))
return rb_nmin_run(obj, num, 0, 0, 0);
m->min = Qundef;
m->cmp_opt.opt_methods = 0;
m->cmp_opt.opt_inited = 0;
if (rb_block_given_p()) {
rb_block_call(obj, id_each, 0, 0, min_ii, memo);
}
else {
rb_block_call(obj, id_each, 0, 0, min_i, memo);
}
result = m->min;
if (result == Qundef) return Qnil;
return result;
}
struct max_t {
VALUE max;
struct cmp_opt_data cmp_opt;
};
static VALUE
max_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct max_t *memo = MEMO_FOR(struct max_t, args);
ENUM_WANT_SVALUE();
if (memo->max == Qundef) {
memo->max = i;
}
else {
if (OPTIMIZED_CMP(i, memo->max, memo->cmp_opt) > 0) {
memo->max = i;
}
}
return Qnil;
}
static VALUE
max_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct max_t *memo = MEMO_FOR(struct max_t, args);
VALUE cmp;
ENUM_WANT_SVALUE();
if (memo->max == Qundef) {
memo->max = i;
}
else {
cmp = rb_yield_values(2, i, memo->max);
if (rb_cmpint(cmp, i, memo->max) > 0) {
memo->max = i;
}
}
return Qnil;
}
/*
* call-seq:
* enum.max -> obj
* enum.max { |a, b| block } -> obj
* enum.max(n) -> array
* enum.max(n) { |a, b| block } -> array
*
* Returns the object in _enum_ with the maximum value. The
* first form assumes all objects implement <code><=></code>;
* the second uses the block to return <em>a <=> b</em>.
*
* a = %w(albatross dog horse)
* a.max #=> "horse"
* a.max { |a, b| a.length <=> b.length } #=> "albatross"
*
* If the +n+ argument is given, maximum +n+ elements are returned
* as an array, sorted in descending order.
*
* a = %w[albatross dog horse]
* a.max(2) #=> ["horse", "dog"]
* a.max(2) {|a, b| a.length <=> b.length } #=> ["albatross", "horse"]
* [5, 1, 3, 4, 2].max(3) #=> [5, 4, 3]
*/
static VALUE
enum_max(int argc, VALUE *argv, VALUE obj)
{
VALUE memo;
struct max_t *m = NEW_CMP_OPT_MEMO(struct max_t, memo);
VALUE result;
VALUE num;
if (rb_check_arity(argc, 0, 1) && !NIL_P(num = argv[0]))
return rb_nmin_run(obj, num, 0, 1, 0);
m->max = Qundef;
m->cmp_opt.opt_methods = 0;
m->cmp_opt.opt_inited = 0;
if (rb_block_given_p()) {
rb_block_call(obj, id_each, 0, 0, max_ii, (VALUE)memo);
}
else {
rb_block_call(obj, id_each, 0, 0, max_i, (VALUE)memo);
}
result = m->max;
if (result == Qundef) return Qnil;
return result;
}
struct minmax_t {
VALUE min;
VALUE max;
VALUE last;
struct cmp_opt_data cmp_opt;
};
static void
minmax_i_update(VALUE i, VALUE j, struct minmax_t *memo)
{
int n;
if (memo->min == Qundef) {
memo->min = i;
memo->max = j;
}
else {
n = OPTIMIZED_CMP(i, memo->min, memo->cmp_opt);
if (n < 0) {
memo->min = i;
}
n = OPTIMIZED_CMP(j, memo->max, memo->cmp_opt);
if (n > 0) {
memo->max = j;
}
}
}
static VALUE
minmax_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
{
struct minmax_t *memo = MEMO_FOR(struct minmax_t, _memo);
int n;
VALUE j;
ENUM_WANT_SVALUE();
if (memo->last == Qundef) {
memo->last = i;
return Qnil;
}
j = memo->last;
memo->last = Qundef;
n = OPTIMIZED_CMP(j, i, memo->cmp_opt);
if (n == 0)
i = j;
else if (n < 0) {
VALUE tmp;
tmp = i;
i = j;
j = tmp;
}
minmax_i_update(i, j, memo);
return Qnil;
}
static void
minmax_ii_update(VALUE i, VALUE j, struct minmax_t *memo)
{
int n;
if (memo->min == Qundef) {
memo->min = i;
memo->max = j;
}
else {
n = rb_cmpint(rb_yield_values(2, i, memo->min), i, memo->min);
if (n < 0) {
memo->min = i;
}
n = rb_cmpint(rb_yield_values(2, j, memo->max), j, memo->max);
if (n > 0) {
memo->max = j;
}
}
}
static VALUE
minmax_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
{
struct minmax_t *memo = MEMO_FOR(struct minmax_t, _memo);
int n;
VALUE j;
ENUM_WANT_SVALUE();
if (memo->last == Qundef) {
memo->last = i;
return Qnil;
}
j = memo->last;
memo->last = Qundef;
n = rb_cmpint(rb_yield_values(2, j, i), j, i);
if (n == 0)
i = j;
else if (n < 0) {
VALUE tmp;
tmp = i;
i = j;
j = tmp;
}
minmax_ii_update(i, j, memo);
return Qnil;
}
/*
* call-seq:
* enum.minmax -> [min, max]
* enum.minmax { |a, b| block } -> [min, max]
*
* Returns a two element array which contains the minimum and the
* maximum value in the enumerable. The first form assumes all
* objects implement <code><=></code>; the second uses the
* block to return <em>a <=> b</em>.
*
* a = %w(albatross dog horse)
* a.minmax #=> ["albatross", "horse"]
* a.minmax { |a, b| a.length <=> b.length } #=> ["dog", "albatross"]
*/
static VALUE
enum_minmax(VALUE obj)
{
VALUE memo;
struct minmax_t *m = NEW_CMP_OPT_MEMO(struct minmax_t, memo);
m->min = Qundef;
m->last = Qundef;
m->cmp_opt.opt_methods = 0;
m->cmp_opt.opt_inited = 0;
if (rb_block_given_p()) {
rb_block_call(obj, id_each, 0, 0, minmax_ii, memo);
if (m->last != Qundef)
minmax_ii_update(m->last, m->last, m);
}
else {
rb_block_call(obj, id_each, 0, 0, minmax_i, memo);
if (m->last != Qundef)
minmax_i_update(m->last, m->last, m);
}
if (m->min != Qundef) {
return rb_assoc_new(m->min, m->max);
}
return rb_assoc_new(Qnil, Qnil);
}
static VALUE
min_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct cmp_opt_data cmp_opt = { 0, 0 };
struct MEMO *memo = MEMO_CAST(args);
VALUE v;
ENUM_WANT_SVALUE();
v = enum_yield(argc, i);
if (memo->v1 == Qundef) {
MEMO_V1_SET(memo, v);
MEMO_V2_SET(memo, i);
}
else if (OPTIMIZED_CMP(v, memo->v1, cmp_opt) < 0) {
MEMO_V1_SET(memo, v);
MEMO_V2_SET(memo, i);
}
return Qnil;
}
/*
* call-seq:
* enum.min_by {|obj| block } -> obj
* enum.min_by -> an_enumerator
* enum.min_by(n) {|obj| block } -> array
* enum.min_by(n) -> an_enumerator
*
* Returns the object in <i>enum</i> that gives the minimum
* value from the given block.
*
* If no block is given, an enumerator is returned instead.
*
* a = %w(albatross dog horse)
* a.min_by { |x| x.length } #=> "dog"
*
* If the +n+ argument is given, minimum +n+ elements are returned
* as an array. These +n+ elements are sorted by the value from the
* given block.
*
* a = %w[albatross dog horse]
* p a.min_by(2) {|x| x.length } #=> ["dog", "horse"]
*/
static VALUE
enum_min_by(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
VALUE num;
rb_check_arity(argc, 0, 1);
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
if (argc && !NIL_P(num = argv[0]))
return rb_nmin_run(obj, num, 1, 0, 0);
memo = MEMO_NEW(Qundef, Qnil, 0);
rb_block_call(obj, id_each, 0, 0, min_by_i, (VALUE)memo);
return memo->v2;
}
static VALUE
max_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct cmp_opt_data cmp_opt = { 0, 0 };
struct MEMO *memo = MEMO_CAST(args);
VALUE v;
ENUM_WANT_SVALUE();
v = enum_yield(argc, i);
if (memo->v1 == Qundef) {
MEMO_V1_SET(memo, v);
MEMO_V2_SET(memo, i);
}
else if (OPTIMIZED_CMP(v, memo->v1, cmp_opt) > 0) {
MEMO_V1_SET(memo, v);
MEMO_V2_SET(memo, i);
}
return Qnil;
}
/*
* call-seq:
* enum.max_by {|obj| block } -> obj
* enum.max_by -> an_enumerator
* enum.max_by(n) {|obj| block } -> obj
* enum.max_by(n) -> an_enumerator
*
* Returns the object in <i>enum</i> that gives the maximum
* value from the given block.
*
* If no block is given, an enumerator is returned instead.
*
* a = %w(albatross dog horse)
* a.max_by { |x| x.length } #=> "albatross"
*
* If the +n+ argument is given, maximum +n+ elements are returned
* as an array. These +n+ elements are sorted by the value from the
* given block, in descending order.
*
* a = %w[albatross dog horse]
* a.max_by(2) {|x| x.length } #=> ["albatross", "horse"]
*
* enum.max_by(n) can be used to implement weighted random sampling.
* Following example implements and use Enumerable#wsample.
*
* module Enumerable
* # weighted random sampling.
* #
* # Pavlos S. Efraimidis, Paul G. Spirakis
* # Weighted random sampling with a reservoir
* # Information Processing Letters
* # Volume 97, Issue 5 (16 March 2006)
* def wsample(n)
* self.max_by(n) {|v| rand ** (1.0/yield(v)) }
* end
* end
* e = (-20..20).to_a*10000
* a = e.wsample(20000) {|x|
* Math.exp(-(x/5.0)**2) # normal distribution
* }
* # a is 20000 samples from e.
* p a.length #=> 20000
* h = a.group_by {|x| x }
* -10.upto(10) {|x| puts "*" * (h[x].length/30.0).to_i if h[x] }
* #=> *
* # ***
* # ******
* # ***********
* # ******************
* # *****************************
* # *****************************************
* # ****************************************************
* # ***************************************************************
* # ********************************************************************
* # ***********************************************************************
* # ***********************************************************************
* # **************************************************************
* # ****************************************************
* # ***************************************
* # ***************************
* # ******************
* # ***********
* # *******
* # ***
* # *
*
*/
static VALUE
enum_max_by(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
VALUE num;
rb_check_arity(argc, 0, 1);
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
if (argc && !NIL_P(num = argv[0]))
return rb_nmin_run(obj, num, 1, 1, 0);
memo = MEMO_NEW(Qundef, Qnil, 0);
rb_block_call(obj, id_each, 0, 0, max_by_i, (VALUE)memo);
return memo->v2;
}
struct minmax_by_t {
VALUE min_bv;
VALUE max_bv;
VALUE min;
VALUE max;
VALUE last_bv;
VALUE last;
};
static void
minmax_by_i_update(VALUE v1, VALUE v2, VALUE i1, VALUE i2, struct minmax_by_t *memo)
{
struct cmp_opt_data cmp_opt = { 0, 0 };
if (memo->min_bv == Qundef) {
memo->min_bv = v1;
memo->max_bv = v2;
memo->min = i1;
memo->max = i2;
}
else {
if (OPTIMIZED_CMP(v1, memo->min_bv, cmp_opt) < 0) {
memo->min_bv = v1;
memo->min = i1;
}
if (OPTIMIZED_CMP(v2, memo->max_bv, cmp_opt) > 0) {
memo->max_bv = v2;
memo->max = i2;
}
}
}
static VALUE
minmax_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
{
struct cmp_opt_data cmp_opt = { 0, 0 };
struct minmax_by_t *memo = MEMO_FOR(struct minmax_by_t, _memo);
VALUE vi, vj, j;
int n;
ENUM_WANT_SVALUE();
vi = enum_yield(argc, i);
if (memo->last_bv == Qundef) {
memo->last_bv = vi;
memo->last = i;
return Qnil;
}
vj = memo->last_bv;
j = memo->last;
memo->last_bv = Qundef;
n = OPTIMIZED_CMP(vj, vi, cmp_opt);
if (n == 0) {
i = j;
vi = vj;
}
else if (n < 0) {
VALUE tmp;
tmp = i;
i = j;
j = tmp;
tmp = vi;
vi = vj;
vj = tmp;
}
minmax_by_i_update(vi, vj, i, j, memo);
return Qnil;
}
/*
* call-seq:
* enum.minmax_by { |obj| block } -> [min, max]
* enum.minmax_by -> an_enumerator
*
* Returns a two element array containing the objects in
* <i>enum</i> that correspond to the minimum and maximum values respectively
* from the given block.
*
* If no block is given, an enumerator is returned instead.
*
* a = %w(albatross dog horse)
* a.minmax_by { |x| x.length } #=> ["dog", "albatross"]
*/
static VALUE
enum_minmax_by(VALUE obj)
{
VALUE memo;
struct minmax_by_t *m = NEW_MEMO_FOR(struct minmax_by_t, memo);
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
m->min_bv = Qundef;
m->max_bv = Qundef;
m->min = Qnil;
m->max = Qnil;
m->last_bv = Qundef;
m->last = Qundef;
rb_block_call(obj, id_each, 0, 0, minmax_by_i, memo);
if (m->last_bv != Qundef)
minmax_by_i_update(m->last_bv, m->last_bv, m->last, m->last, m);
m = MEMO_FOR(struct minmax_by_t, memo);
return rb_assoc_new(m->min, m->max);
}
static VALUE
member_i(RB_BLOCK_CALL_FUNC_ARGLIST(iter, args))
{
struct MEMO *memo = MEMO_CAST(args);
if (rb_equal(rb_enum_values_pack(argc, argv), memo->v1)) {
MEMO_V2_SET(memo, Qtrue);
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* enum.include?(obj) -> true or false
* enum.member?(obj) -> true or false
*
* Returns <code>true</code> if any member of <i>enum</i> equals
* <i>obj</i>. Equality is tested using <code>==</code>.
*
* (1..10).include? 5 #=> true
* (1..10).include? 15 #=> false
* (1..10).member? 5 #=> true
* (1..10).member? 15 #=> false
*
*/
static VALUE
enum_member(VALUE obj, VALUE val)
{
struct MEMO *memo = MEMO_NEW(val, Qfalse, 0);
rb_block_call(obj, id_each, 0, 0, member_i, (VALUE)memo);
return memo->v2;
}
static VALUE
each_with_index_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo))
{
struct MEMO *m = MEMO_CAST(memo);
VALUE n = imemo_count_value(m);
imemo_count_up(m);
return rb_yield_values(2, rb_enum_values_pack(argc, argv), n);
}
/*
* call-seq:
* enum.each_with_index(*args) { |obj, i| block } -> enum
* enum.each_with_index(*args) -> an_enumerator
*
* Calls <em>block</em> with two arguments, the item and its index,
* for each item in <i>enum</i>. Given arguments are passed through
* to #each().
*
* If no block is given, an enumerator is returned instead.
*
* hash = Hash.new
* %w(cat dog wombat).each_with_index { |item, index|
* hash[item] = index
* }
* hash #=> {"cat"=>0, "dog"=>1, "wombat"=>2}
*
*/
static VALUE
enum_each_with_index(int argc, VALUE *argv, VALUE obj)
{
struct MEMO *memo;
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
memo = MEMO_NEW(0, 0, 0);
rb_block_call(obj, id_each, argc, argv, each_with_index_i, (VALUE)memo);
return obj;
}
/*
* call-seq:
* enum.reverse_each(*args) { |item| block } -> enum
* enum.reverse_each(*args) -> an_enumerator
*
* Builds a temporary array and traverses that array in reverse order.
*
* If no block is given, an enumerator is returned instead.
*
* (1..3).reverse_each { |v| p v }
*
* produces:
*
* 3
* 2
* 1
*/
static VALUE
enum_reverse_each(int argc, VALUE *argv, VALUE obj)
{
VALUE ary;
long len;
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
ary = enum_to_a(argc, argv, obj);
len = RARRAY_LEN(ary);
while (len--) {
long nlen;
rb_yield(RARRAY_AREF(ary, len));
nlen = RARRAY_LEN(ary);
if (nlen < len) {
len = nlen;
}
}
return obj;
}
static VALUE
each_val_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
{
ENUM_WANT_SVALUE();
enum_yield(argc, i);
return Qnil;
}
/*
* call-seq:
* enum.each_entry { |obj| block } -> enum
* enum.each_entry -> an_enumerator
*
* Calls <i>block</i> once for each element in +self+, passing that
* element as a parameter, converting multiple values from yield to an
* array.
*
* If no block is given, an enumerator is returned instead.
*
* class Foo
* include Enumerable
* def each
* yield 1
* yield 1, 2
* yield
* end
* end
* Foo.new.each_entry{ |o| p o }
*
* produces:
*
* 1
* [1, 2]
* nil
*
*/
static VALUE
enum_each_entry(int argc, VALUE *argv, VALUE obj)
{
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
rb_block_call(obj, id_each, argc, argv, each_val_i, 0);
return obj;
}
static VALUE
add_int(VALUE x, long n)
{
const VALUE y = LONG2NUM(n);
if (RB_INTEGER_TYPE_P(x)) return rb_int_plus(x, y);
return rb_funcallv(x, '+', 1, &y);
}
static VALUE
div_int(VALUE x, long n)
{
const VALUE y = LONG2NUM(n);
if (RB_INTEGER_TYPE_P(x)) return rb_int_idiv(x, y);
return rb_funcallv(x, id_div, 1, &y);
}
#define dont_recycle_block_arg(arity) ((arity) == 1 || (arity) < 0)
static VALUE
each_slice_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, m))
{
struct MEMO *memo = MEMO_CAST(m);
VALUE ary = memo->v1;
VALUE v = Qnil;
long size = memo->u3.cnt;
ENUM_WANT_SVALUE();
rb_ary_push(ary, i);
if (RARRAY_LEN(ary) == size) {
v = rb_yield(ary);
if (memo->v2) {
MEMO_V1_SET(memo, rb_ary_new2(size));
}
else {
rb_ary_clear(ary);
}
}
return v;
}
static VALUE
enum_each_slice_size(VALUE obj, VALUE args, VALUE eobj)
{
VALUE n, size;
long slice_size = NUM2LONG(RARRAY_AREF(args, 0));
ID infinite_p;
CONST_ID(infinite_p, "infinite?");
if (slice_size <= 0) rb_raise(rb_eArgError, "invalid slice size");
size = enum_size(obj, 0, 0);
if (size == Qnil) return Qnil;
if (RB_FLOAT_TYPE_P(size) && RTEST(rb_funcall(size, infinite_p, 0))) {
return size;
}
n = add_int(size, slice_size-1);
return div_int(n, slice_size);
}
/*
* call-seq:
* enum.each_slice(n) { ... } -> nil
* enum.each_slice(n) -> an_enumerator
*
* Iterates the given block for each slice of <n> elements. If no
* block is given, returns an enumerator.
*
* (1..10).each_slice(3) { |a| p a }
* # outputs below
* [1, 2, 3]
* [4, 5, 6]
* [7, 8, 9]
* [10]
*
*/
static VALUE
enum_each_slice(VALUE obj, VALUE n)
{
long size = NUM2LONG(n);
VALUE ary;
struct MEMO *memo;
int arity;
if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
RETURN_SIZED_ENUMERATOR(obj, 1, &n, enum_each_slice_size);
size = limit_by_enum_size(obj, size);
ary = rb_ary_new2(size);
arity = rb_block_arity();
memo = MEMO_NEW(ary, dont_recycle_block_arg(arity), size);
rb_block_call(obj, id_each, 0, 0, each_slice_i, (VALUE)memo);
ary = memo->v1;
if (RARRAY_LEN(ary) > 0) rb_yield(ary);
return Qnil;
}
static VALUE
each_cons_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
VALUE ary = memo->v1;
VALUE v = Qnil;
long size = memo->u3.cnt;
ENUM_WANT_SVALUE();
if (RARRAY_LEN(ary) == size) {
rb_ary_shift(ary);
}
rb_ary_push(ary, i);
if (RARRAY_LEN(ary) == size) {
if (memo->v2) {
ary = rb_ary_dup(ary);
}
v = rb_yield(ary);
}
return v;
}
static VALUE
enum_each_cons_size(VALUE obj, VALUE args, VALUE eobj)
{
struct cmp_opt_data cmp_opt = { 0, 0 };
const VALUE zero = LONG2FIX(0);
VALUE n, size;
long cons_size = NUM2LONG(RARRAY_AREF(args, 0));
if (cons_size <= 0) rb_raise(rb_eArgError, "invalid size");
size = enum_size(obj, 0, 0);
if (size == Qnil) return Qnil;
n = add_int(size, 1 - cons_size);
return (OPTIMIZED_CMP(n, zero, cmp_opt) == -1) ? zero : n;
}
/*
* call-seq:
* enum.each_cons(n) { ... } -> nil
* enum.each_cons(n) -> an_enumerator
*
* Iterates the given block for each array of consecutive <n>
* elements. If no block is given, returns an enumerator.
*
* e.g.:
* (1..10).each_cons(3) { |a| p a }
* # outputs below
* [1, 2, 3]
* [2, 3, 4]
* [3, 4, 5]
* [4, 5, 6]
* [5, 6, 7]
* [6, 7, 8]
* [7, 8, 9]
* [8, 9, 10]
*
*/
static VALUE
enum_each_cons(VALUE obj, VALUE n)
{
long size = NUM2LONG(n);
struct MEMO *memo;
int arity;
if (size <= 0) rb_raise(rb_eArgError, "invalid size");
RETURN_SIZED_ENUMERATOR(obj, 1, &n, enum_each_cons_size);
arity = rb_block_arity();
if (enum_size_over_p(obj, size)) return Qnil;
memo = MEMO_NEW(rb_ary_new2(size), dont_recycle_block_arg(arity), size);
rb_block_call(obj, id_each, 0, 0, each_cons_i, (VALUE)memo);
return Qnil;
}
static VALUE
each_with_object_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo))
{
ENUM_WANT_SVALUE();
return rb_yield_values(2, i, memo);
}
/*
* call-seq:
* enum.each_with_object(obj) { |(*args), memo_obj| ... } -> obj
* enum.each_with_object(obj) -> an_enumerator
*
* Iterates the given block for each element with an arbitrary
* object given, and returns the initially given object.
*
* If no block is given, returns an enumerator.
*
* evens = (1..10).each_with_object([]) { |i, a| a << i*2 }
* #=> [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
*
*/
static VALUE
enum_each_with_object(VALUE obj, VALUE memo)
{
RETURN_SIZED_ENUMERATOR(obj, 1, &memo, enum_size);
rb_block_call(obj, id_each, 0, 0, each_with_object_i, memo);
return memo;
}
static VALUE
zip_ary(RB_BLOCK_CALL_FUNC_ARGLIST(val, memoval))
{
struct MEMO *memo = (struct MEMO *)memoval;
VALUE result = memo->v1;
VALUE args = memo->v2;
long n = memo->u3.cnt++;
VALUE tmp;
int i;
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
rb_ary_store(tmp, 0, rb_enum_values_pack(argc, argv));
for (i=0; i<RARRAY_LEN(args); i++) {
VALUE e = RARRAY_AREF(args, i);
if (RARRAY_LEN(e) <= n) {
rb_ary_push(tmp, Qnil);
}
else {
rb_ary_push(tmp, RARRAY_AREF(e, n));
}
}
if (NIL_P(result)) {
enum_yield_array(tmp);
}
else {
rb_ary_push(result, tmp);
}
RB_GC_GUARD(args);
return Qnil;
}
static VALUE
call_next(VALUE w)
{
VALUE *v = (VALUE *)w;
return v[0] = rb_funcallv(v[1], id_next, 0, 0);
}
static VALUE
call_stop(VALUE w, VALUE _)
{
VALUE *v = (VALUE *)w;
return v[0] = Qundef;
}
static VALUE
zip_i(RB_BLOCK_CALL_FUNC_ARGLIST(val, memoval))
{
struct MEMO *memo = (struct MEMO *)memoval;
VALUE result = memo->v1;
VALUE args = memo->v2;
VALUE tmp;
int i;
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
rb_ary_store(tmp, 0, rb_enum_values_pack(argc, argv));
for (i=0; i<RARRAY_LEN(args); i++) {
if (NIL_P(RARRAY_AREF(args, i))) {
rb_ary_push(tmp, Qnil);
}
else {
VALUE v[2];
v[1] = RARRAY_AREF(args, i);
rb_rescue2(call_next, (VALUE)v, call_stop, (VALUE)v, rb_eStopIteration, (VALUE)0);
if (v[0] == Qundef) {
RARRAY_ASET(args, i, Qnil);
v[0] = Qnil;
}
rb_ary_push(tmp, v[0]);
}
}
if (NIL_P(result)) {
enum_yield_array(tmp);
}
else {
rb_ary_push(result, tmp);
}
RB_GC_GUARD(args);
return Qnil;
}
/*
* call-seq:
* enum.zip(arg, ...) -> an_array_of_array
* enum.zip(arg, ...) { |arr| block } -> nil
*
* Takes one element from <i>enum</i> and merges corresponding
* elements from each <i>args</i>. This generates a sequence of
* <em>n</em>-element arrays, where <em>n</em> is one more than the
* count of arguments. The length of the resulting sequence will be
* <code>enum#size</code>. If the size of any argument is less than
* <code>enum#size</code>, <code>nil</code> values are supplied. If
* a block is given, it is invoked for each output array, otherwise
* an array of arrays is returned.
*
* a = [ 4, 5, 6 ]
* b = [ 7, 8, 9 ]
*
* a.zip(b) #=> [[4, 7], [5, 8], [6, 9]]
* [1, 2, 3].zip(a, b) #=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
* [1, 2].zip(a, b) #=> [[1, 4, 7], [2, 5, 8]]
* a.zip([1, 2], [8]) #=> [[4, 1, 8], [5, 2, nil], [6, nil, nil]]
*
* c = []
* a.zip(b) { |x, y| c << x + y } #=> nil
* c #=> [11, 13, 15]
*
*/
static VALUE
enum_zip(int argc, VALUE *argv, VALUE obj)
{
int i;
ID conv;
struct MEMO *memo;
VALUE result = Qnil;
VALUE args = rb_ary_new4(argc, argv);
int allary = TRUE;
argv = RARRAY_PTR(args);
for (i=0; i<argc; i++) {
VALUE ary = rb_check_array_type(argv[i]);
if (NIL_P(ary)) {
allary = FALSE;
break;
}
argv[i] = ary;
}
if (!allary) {
static const VALUE sym_each = STATIC_ID2SYM(id_each);
CONST_ID(conv, "to_enum");
for (i=0; i<argc; i++) {
if (!rb_respond_to(argv[i], id_each)) {
rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (must respond to :each)",
rb_obj_class(argv[i]));
}
argv[i] = rb_funcallv(argv[i], conv, 1, &sym_each);
}
}
if (!rb_block_given_p()) {
result = rb_ary_new();
}
/* TODO: use NODE_DOT2 as memo(v, v, -) */
memo = MEMO_NEW(result, args, 0);
rb_block_call(obj, id_each, 0, 0, allary ? zip_ary : zip_i, (VALUE)memo);
return result;
}
static VALUE
take_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
rb_ary_push(memo->v1, rb_enum_values_pack(argc, argv));
if (--memo->u3.cnt == 0) rb_iter_break();
return Qnil;
}
/*
* call-seq:
* enum.take(n) -> array
*
* Returns first n elements from <i>enum</i>.
*
* a = [1, 2, 3, 4, 5, 0]
* a.take(3) #=> [1, 2, 3]
* a.take(30) #=> [1, 2, 3, 4, 5, 0]
*
*/
static VALUE
enum_take(VALUE obj, VALUE n)
{
struct MEMO *memo;
VALUE result;
long len = NUM2LONG(n);
if (len < 0) {
rb_raise(rb_eArgError, "attempt to take negative size");
}
if (len == 0) return rb_ary_new2(0);
result = rb_ary_new2(len);
memo = MEMO_NEW(result, 0, len);
rb_block_call(obj, id_each, 0, 0, take_i, (VALUE)memo);
return result;
}
static VALUE
take_while_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
if (!RTEST(rb_yield_values2(argc, argv))) rb_iter_break();
rb_ary_push(ary, rb_enum_values_pack(argc, argv));
return Qnil;
}
/*
* call-seq:
* enum.take_while { |obj| block } -> array
* enum.take_while -> an_enumerator
*
* Passes elements to the block until the block returns +nil+ or +false+,
* then stops iterating and returns an array of all prior elements.
*
* If no block is given, an enumerator is returned instead.
*
* a = [1, 2, 3, 4, 5, 0]
* a.take_while { |i| i < 3 } #=> [1, 2]
*
*/
static VALUE
enum_take_while(VALUE obj)
{
VALUE ary;
RETURN_ENUMERATOR(obj, 0, 0);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, take_while_i, ary);
return ary;
}
static VALUE
drop_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
if (memo->u3.cnt == 0) {
rb_ary_push(memo->v1, rb_enum_values_pack(argc, argv));
}
else {
memo->u3.cnt--;
}
return Qnil;
}
/*
* call-seq:
* enum.drop(n) -> array
*
* Drops first n elements from <i>enum</i>, and returns rest elements
* in an array.
*
* a = [1, 2, 3, 4, 5, 0]
* a.drop(3) #=> [4, 5, 0]
*
*/
static VALUE
enum_drop(VALUE obj, VALUE n)
{
VALUE result;
struct MEMO *memo;
long len = NUM2LONG(n);
if (len < 0) {
rb_raise(rb_eArgError, "attempt to drop negative size");
}
result = rb_ary_new();
memo = MEMO_NEW(result, 0, len);
rb_block_call(obj, id_each, 0, 0, drop_i, (VALUE)memo);
return result;
}
static VALUE
drop_while_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
struct MEMO *memo = MEMO_CAST(args);
ENUM_WANT_SVALUE();
if (!memo->u3.state && !RTEST(enum_yield(argc, i))) {
memo->u3.state = TRUE;
}
if (memo->u3.state) {
rb_ary_push(memo->v1, i);
}
return Qnil;
}
/*
* call-seq:
* enum.drop_while { |obj| block } -> array
* enum.drop_while -> an_enumerator
*
* Drops elements up to, but not including, the first element for
* which the block returns +nil+ or +false+ and returns an array
* containing the remaining elements.
*
* If no block is given, an enumerator is returned instead.
*
* a = [1, 2, 3, 4, 5, 0]
* a.drop_while { |i| i < 3 } #=> [3, 4, 5, 0]
*
*/
static VALUE
enum_drop_while(VALUE obj)
{
VALUE result;
struct MEMO *memo;
RETURN_ENUMERATOR(obj, 0, 0);
result = rb_ary_new();
memo = MEMO_NEW(result, 0, FALSE);
rb_block_call(obj, id_each, 0, 0, drop_while_i, (VALUE)memo);
return result;
}
static VALUE
cycle_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
ENUM_WANT_SVALUE();
rb_ary_push(ary, argc > 1 ? i : rb_ary_new_from_values(argc, argv));
enum_yield(argc, i);
return Qnil;
}
static VALUE
enum_cycle_size(VALUE self, VALUE args, VALUE eobj)
{
long mul = 0;
VALUE n = Qnil;
VALUE size;
if (args && (RARRAY_LEN(args) > 0)) {
n = RARRAY_AREF(args, 0);
if (!NIL_P(n)) mul = NUM2LONG(n);
}
size = enum_size(self, args, 0);
if (NIL_P(size) || FIXNUM_ZERO_P(size)) return size;
if (NIL_P(n)) return DBL2NUM(HUGE_VAL);
if (mul <= 0) return INT2FIX(0);
n = LONG2FIX(mul);
return rb_funcallv(size, '*', 1, &n);
}
/*
* call-seq:
* enum.cycle(n=nil) { |obj| block } -> nil
* enum.cycle(n=nil) -> an_enumerator
*
* Calls <i>block</i> for each element of <i>enum</i> repeatedly _n_
* times or forever if none or +nil+ is given. If a non-positive
* number is given or the collection is empty, does nothing. Returns
* +nil+ if the loop has finished without getting interrupted.
*
* Enumerable#cycle saves elements in an internal array so changes
* to <i>enum</i> after the first pass have no effect.
*
* If no block is given, an enumerator is returned instead.
*
* a = ["a", "b", "c"]
* a.cycle { |x| puts x } # print, a, b, c, a, b, c,.. forever.
* a.cycle(2) { |x| puts x } # print, a, b, c, a, b, c.
*
*/
static VALUE
enum_cycle(int argc, VALUE *argv, VALUE obj)
{
VALUE ary;
VALUE nv = Qnil;
long n, i, len;
rb_check_arity(argc, 0, 1);
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_cycle_size);
if (!argc || NIL_P(nv = argv[0])) {
n = -1;
}
else {
n = NUM2LONG(nv);
if (n <= 0) return Qnil;
}
ary = rb_ary_new();
RBASIC_CLEAR_CLASS(ary);
rb_block_call(obj, id_each, 0, 0, cycle_i, ary);
len = RARRAY_LEN(ary);
if (len == 0) return Qnil;
while (n < 0 || 0 < --n) {
for (i=0; i<len; i++) {
enum_yield_array(RARRAY_AREF(ary, i));
}
}
return Qnil;
}
struct chunk_arg {
VALUE categorize;
VALUE prev_value;
VALUE prev_elts;
VALUE yielder;
};
static VALUE
chunk_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _argp))
{
struct chunk_arg *argp = MEMO_FOR(struct chunk_arg, _argp);
VALUE v, s;
VALUE alone = ID2SYM(id__alone);
VALUE separator = ID2SYM(id__separator);
ENUM_WANT_SVALUE();
v = rb_funcallv(argp->categorize, id_call, 1, &i);
if (v == alone) {
if (!NIL_P(argp->prev_value)) {
s = rb_assoc_new(argp->prev_value, argp->prev_elts);
rb_funcallv(argp->yielder, id_lshift, 1, &s);
argp->prev_value = argp->prev_elts = Qnil;
}
v = rb_assoc_new(v, rb_ary_new3(1, i));
rb_funcallv(argp->yielder, id_lshift, 1, &v);
}
else if (NIL_P(v) || v == separator) {
if (!NIL_P(argp->prev_value)) {
v = rb_assoc_new(argp->prev_value, argp->prev_elts);
rb_funcallv(argp->yielder, id_lshift, 1, &v);
argp->prev_value = argp->prev_elts = Qnil;
}
}
else if (SYMBOL_P(v) && (s = rb_sym2str(v), RSTRING_PTR(s)[0] == '_')) {
rb_raise(rb_eRuntimeError, "symbols beginning with an underscore are reserved");
}
else {
if (NIL_P(argp->prev_value)) {
argp->prev_value = v;
argp->prev_elts = rb_ary_new3(1, i);
}
else {
if (rb_equal(argp->prev_value, v)) {
rb_ary_push(argp->prev_elts, i);
}
else {
s = rb_assoc_new(argp->prev_value, argp->prev_elts);
rb_funcallv(argp->yielder, id_lshift, 1, &s);
argp->prev_value = v;
argp->prev_elts = rb_ary_new3(1, i);
}
}
}
return Qnil;
}
static VALUE
chunk_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
{
VALUE enumerable;
VALUE arg;
struct chunk_arg *memo = NEW_MEMO_FOR(struct chunk_arg, arg);
enumerable = rb_ivar_get(enumerator, id_chunk_enumerable);
memo->categorize = rb_ivar_get(enumerator, id_chunk_categorize);
memo->prev_value = Qnil;
memo->prev_elts = Qnil;
memo->yielder = yielder;
rb_block_call(enumerable, id_each, 0, 0, chunk_ii, arg);
memo = MEMO_FOR(struct chunk_arg, arg);
if (!NIL_P(memo->prev_elts)) {
arg = rb_assoc_new(memo->prev_value, memo->prev_elts);
rb_funcallv(memo->yielder, id_lshift, 1, &arg);
}
return Qnil;
}
/*
* call-seq:
* enum.chunk { |elt| ... } -> an_enumerator
*
* Enumerates over the items, chunking them together based on the return
* value of the block.
*
* Consecutive elements which return the same block value are chunked together.
*
* For example, consecutive even numbers and odd numbers can be
* chunked as follows.
*
* [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5].chunk { |n|
* n.even?
* }.each { |even, ary|
* p [even, ary]
* }
* #=> [false, [3, 1]]
* # [true, [4]]
* # [false, [1, 5, 9]]
* # [true, [2, 6]]
* # [false, [5, 3, 5]]
*
* This method is especially useful for sorted series of elements.
* The following example counts words for each initial letter.
*
* open("/usr/share/dict/words", "r:iso-8859-1") { |f|
* f.chunk { |line| line.upcase.ord }.each { |ch, lines| p [ch.chr, lines.length] }
* }
* #=> ["\n", 1]
* # ["A", 1327]
* # ["B", 1372]
* # ["C", 1507]
* # ["D", 791]
* # ...
*
* The following key values have special meaning:
* - +nil+ and +:_separator+ specifies that the elements should be dropped.
* - +:_alone+ specifies that the element should be chunked by itself.
*
* Any other symbols that begin with an underscore will raise an error:
*
* items.chunk { |item| :_underscore }
* #=> RuntimeError: symbols beginning with an underscore are reserved
*
* +nil+ and +:_separator+ can be used to ignore some elements.
*
* For example, the sequence of hyphens in svn log can be eliminated as follows:
*
* sep = "-"*72 + "\n"
* IO.popen("svn log README") { |f|
* f.chunk { |line|
* line != sep || nil
* }.each { |_, lines|
* pp lines
* }
* }
* #=> ["r20018 | knu | 2008-10-29 13:20:42 +0900 (Wed, 29 Oct 2008) | 2 lines\n",
* # "\n",
* # "* README, README.ja: Update the portability section.\n",
* # "\n"]
* # ["r16725 | knu | 2008-05-31 23:34:23 +0900 (Sat, 31 May 2008) | 2 lines\n",
* # "\n",
* # "* README, README.ja: Add a note about default C flags.\n",
* # "\n"]
* # ...
*
* Paragraphs separated by empty lines can be parsed as follows:
*
* File.foreach("README").chunk { |line|
* /\A\s*\z/ !~ line || nil
* }.each { |_, lines|
* pp lines
* }
*
* +:_alone+ can be used to force items into their own chunk.
* For example, you can put lines that contain a URL by themselves,
* and chunk the rest of the lines together, like this:
*
* pattern = /http/
* open(filename) { |f|
* f.chunk { |line| line =~ pattern ? :_alone : true }.each { |key, lines|
* pp lines
* }
* }
*
* If no block is given, an enumerator to `chunk` is returned instead.
*/
static VALUE
enum_chunk(VALUE enumerable)
{
VALUE enumerator;
RETURN_SIZED_ENUMERATOR(enumerable, 0, 0, enum_size);
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_chunk_enumerable, enumerable);
rb_ivar_set(enumerator, id_chunk_categorize, rb_block_proc());
rb_block_call(enumerator, idInitialize, 0, 0, chunk_i, enumerator);
return enumerator;
}
struct slicebefore_arg {
VALUE sep_pred;
VALUE sep_pat;
VALUE prev_elts;
VALUE yielder;
};
static VALUE
slicebefore_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _argp))
{
struct slicebefore_arg *argp = MEMO_FOR(struct slicebefore_arg, _argp);
VALUE header_p;
ENUM_WANT_SVALUE();
if (!NIL_P(argp->sep_pat))
header_p = rb_funcallv(argp->sep_pat, id_eqq, 1, &i);
else
header_p = rb_funcallv(argp->sep_pred, id_call, 1, &i);
if (RTEST(header_p)) {
if (!NIL_P(argp->prev_elts))
rb_funcallv(argp->yielder, id_lshift, 1, &argp->prev_elts);
argp->prev_elts = rb_ary_new3(1, i);
}
else {
if (NIL_P(argp->prev_elts))
argp->prev_elts = rb_ary_new3(1, i);
else
rb_ary_push(argp->prev_elts, i);
}
return Qnil;
}
static VALUE
slicebefore_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
{
VALUE enumerable;
VALUE arg;
struct slicebefore_arg *memo = NEW_MEMO_FOR(struct slicebefore_arg, arg);
enumerable = rb_ivar_get(enumerator, id_slicebefore_enumerable);
memo->sep_pred = rb_attr_get(enumerator, id_slicebefore_sep_pred);
memo->sep_pat = NIL_P(memo->sep_pred) ? rb_ivar_get(enumerator, id_slicebefore_sep_pat) : Qnil;
memo->prev_elts = Qnil;
memo->yielder = yielder;
rb_block_call(enumerable, id_each, 0, 0, slicebefore_ii, arg);
memo = MEMO_FOR(struct slicebefore_arg, arg);
if (!NIL_P(memo->prev_elts))
rb_funcallv(memo->yielder, id_lshift, 1, &memo->prev_elts);
return Qnil;
}
/*
* call-seq:
* enum.slice_before(pattern) -> an_enumerator
* enum.slice_before { |elt| bool } -> an_enumerator
*
* Creates an enumerator for each chunked elements.
* The beginnings of chunks are defined by _pattern_ and the block.
* If <code>_pattern_ === _elt_</code> returns <code>true</code> or the block
* returns <code>true</code> for the element, the element is beginning of a
* chunk.
* The <code>===</code> and _block_ is called from the first element to the last
* element of _enum_. The result for the first element is ignored.
* The result enumerator yields the chunked elements as an array.
* So +each+ method can be called as follows:
*
* enum.slice_before(pattern).each { |ary| ... }
* enum.slice_before { |elt| bool }.each { |ary| ... }
*
* Other methods of the Enumerator class and Enumerable module,
* such as +to_a+, +map+, etc., are also usable.
*
* For example, iteration over ChangeLog entries can be implemented as
* follows:
*
* # iterate over ChangeLog entries.
* open("ChangeLog") { |f|
* f.slice_before(/\A\S/).each { |e| pp e }
* }
*
* # same as above. block is used instead of pattern argument.
* open("ChangeLog") { |f|
* f.slice_before { |line| /\A\S/ === line }.each { |e| pp e }
* }
*
*
* "svn proplist -R" produces multiline output for each file.
* They can be chunked as follows:
*
* IO.popen([{"LC_ALL"=>"C"}, "svn", "proplist", "-R"]) { |f|
* f.lines.slice_before(/\AProp/).each { |lines| p lines }
* }
* #=> ["Properties on '.':\n", " svn:ignore\n", " svk:merge\n"]
* # ["Properties on 'goruby.c':\n", " svn:eol-style\n"]
* # ["Properties on 'complex.c':\n", " svn:mime-type\n", " svn:eol-style\n"]
* # ["Properties on 'regparse.c':\n", " svn:eol-style\n"]
* # ...
*
* If the block needs to maintain state over multiple elements,
* local variables can be used.
* For example, three or more consecutive increasing numbers can be squashed
* as follows (see +chunk_while+ for a better way):
*
* a = [0, 2, 3, 4, 6, 7, 9]
* prev = a[0]
* p a.slice_before { |e|
* prev, prev2 = e, prev
* prev2 + 1 != e
* }.map { |es|
* es.length <= 2 ? es.join(",") : "#{es.first}-#{es.last}"
* }.join(",")
* #=> "0,2-4,6,7,9"
*
* However local variables should be used carefully
* if the result enumerator is enumerated twice or more.
* The local variables should be initialized for each enumeration.
* Enumerator.new can be used to do it.
*
* # Word wrapping. This assumes all characters have same width.
* def wordwrap(words, maxwidth)
* Enumerator.new {|y|
* # cols is initialized in Enumerator.new.
* cols = 0
* words.slice_before { |w|
* cols += 1 if cols != 0
* cols += w.length
* if maxwidth < cols
* cols = w.length
* true
* else
* false
* end
* }.each {|ws| y.yield ws }
* }
* end
* text = (1..20).to_a.join(" ")
* enum = wordwrap(text.split(/\s+/), 10)
* puts "-"*10
* enum.each { |ws| puts ws.join(" ") } # first enumeration.
* puts "-"*10
* enum.each { |ws| puts ws.join(" ") } # second enumeration generates same result as the first.
* puts "-"*10
* #=> ----------
* # 1 2 3 4 5
* # 6 7 8 9 10
* # 11 12 13
* # 14 15 16
* # 17 18 19
* # 20
* # ----------
* # 1 2 3 4 5
* # 6 7 8 9 10
* # 11 12 13
* # 14 15 16
* # 17 18 19
* # 20
* # ----------
*
* mbox contains series of mails which start with Unix From line.
* So each mail can be extracted by slice before Unix From line.
*
* # parse mbox
* open("mbox") { |f|
* f.slice_before { |line|
* line.start_with? "From "
* }.each { |mail|
* unix_from = mail.shift
* i = mail.index("\n")
* header = mail[0...i]
* body = mail[(i+1)..-1]
* body.pop if body.last == "\n"
* fields = header.slice_before { |line| !" \t".include?(line[0]) }.to_a
* p unix_from
* pp fields
* pp body
* }
* }
*
* # split mails in mbox (slice before Unix From line after an empty line)
* open("mbox") { |f|
* emp = true
* f.slice_before { |line|
* prevemp = emp
* emp = line == "\n"
* prevemp && line.start_with?("From ")
* }.each { |mail|
* mail.pop if mail.last == "\n"
* pp mail
* }
* }
*
*/
static VALUE
enum_slice_before(int argc, VALUE *argv, VALUE enumerable)
{
VALUE enumerator;
if (rb_block_given_p()) {
if (argc != 0)
rb_error_arity(argc, 0, 0);
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_slicebefore_sep_pred, rb_block_proc());
}
else {
VALUE sep_pat;
rb_scan_args(argc, argv, "1", &sep_pat);
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_slicebefore_sep_pat, sep_pat);
}
rb_ivar_set(enumerator, id_slicebefore_enumerable, enumerable);
rb_block_call(enumerator, idInitialize, 0, 0, slicebefore_i, enumerator);
return enumerator;
}
struct sliceafter_arg {
VALUE pat;
VALUE pred;
VALUE prev_elts;
VALUE yielder;
};
static VALUE
sliceafter_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
{
#define UPDATE_MEMO ((void)(memo = MEMO_FOR(struct sliceafter_arg, _memo)))
struct sliceafter_arg *memo;
int split_p;
UPDATE_MEMO;
ENUM_WANT_SVALUE();
if (NIL_P(memo->prev_elts)) {
memo->prev_elts = rb_ary_new3(1, i);
}
else {
rb_ary_push(memo->prev_elts, i);
}
if (NIL_P(memo->pred)) {
split_p = RTEST(rb_funcallv(memo->pat, id_eqq, 1, &i));
UPDATE_MEMO;
}
else {
split_p = RTEST(rb_funcallv(memo->pred, id_call, 1, &i));
UPDATE_MEMO;
}
if (split_p) {
rb_funcallv(memo->yielder, id_lshift, 1, &memo->prev_elts);
UPDATE_MEMO;
memo->prev_elts = Qnil;
}
return Qnil;
#undef UPDATE_MEMO
}
static VALUE
sliceafter_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
{
VALUE enumerable;
VALUE arg;
struct sliceafter_arg *memo = NEW_MEMO_FOR(struct sliceafter_arg, arg);
enumerable = rb_ivar_get(enumerator, id_sliceafter_enum);
memo->pat = rb_ivar_get(enumerator, id_sliceafter_pat);
memo->pred = rb_attr_get(enumerator, id_sliceafter_pred);
memo->prev_elts = Qnil;
memo->yielder = yielder;
rb_block_call(enumerable, id_each, 0, 0, sliceafter_ii, arg);
memo = MEMO_FOR(struct sliceafter_arg, arg);
if (!NIL_P(memo->prev_elts))
rb_funcallv(memo->yielder, id_lshift, 1, &memo->prev_elts);
return Qnil;
}
/*
* call-seq:
* enum.slice_after(pattern) -> an_enumerator
* enum.slice_after { |elt| bool } -> an_enumerator
*
* Creates an enumerator for each chunked elements.
* The ends of chunks are defined by _pattern_ and the block.
*
* If <code>_pattern_ === _elt_</code> returns <code>true</code> or the block
* returns <code>true</code> for the element, the element is end of a
* chunk.
*
* The <code>===</code> and _block_ is called from the first element to the last
* element of _enum_.
*
* The result enumerator yields the chunked elements as an array.
* So +each+ method can be called as follows:
*
* enum.slice_after(pattern).each { |ary| ... }
* enum.slice_after { |elt| bool }.each { |ary| ... }
*
* Other methods of the Enumerator class and Enumerable module,
* such as +map+, etc., are also usable.
*
* For example, continuation lines (lines end with backslash) can be
* concatenated as follows:
*
* lines = ["foo\n", "bar\\\n", "baz\n", "\n", "qux\n"]
* e = lines.slice_after(/(?<!\\)\n\z/)
* p e.to_a
* #=> [["foo\n"], ["bar\\\n", "baz\n"], ["\n"], ["qux\n"]]
* p e.map {|ll| ll[0...-1].map {|l| l.sub(/\\\n\z/, "") }.join + ll.last }
* #=>["foo\n", "barbaz\n", "\n", "qux\n"]
*
*/
static VALUE
enum_slice_after(int argc, VALUE *argv, VALUE enumerable)
{
VALUE enumerator;
VALUE pat = Qnil, pred = Qnil;
if (rb_block_given_p()) {
if (0 < argc)
rb_raise(rb_eArgError, "both pattern and block are given");
pred = rb_block_proc();
}
else {
rb_scan_args(argc, argv, "1", &pat);
}
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_sliceafter_enum, enumerable);
rb_ivar_set(enumerator, id_sliceafter_pat, pat);
rb_ivar_set(enumerator, id_sliceafter_pred, pred);
rb_block_call(enumerator, idInitialize, 0, 0, sliceafter_i, enumerator);
return enumerator;
}
struct slicewhen_arg {
VALUE pred;
VALUE prev_elt;
VALUE prev_elts;
VALUE yielder;
int inverted; /* 0 for slice_when and 1 for chunk_while. */
};
static VALUE
slicewhen_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
{
#define UPDATE_MEMO ((void)(memo = MEMO_FOR(struct slicewhen_arg, _memo)))
struct slicewhen_arg *memo;
int split_p;
UPDATE_MEMO;
ENUM_WANT_SVALUE();
if (memo->prev_elt == Qundef) {
/* The first element */
memo->prev_elt = i;
memo->prev_elts = rb_ary_new3(1, i);
}
else {
VALUE args[2];
args[0] = memo->prev_elt;
args[1] = i;
split_p = RTEST(rb_funcallv(memo->pred, id_call, 2, args));
UPDATE_MEMO;
if (memo->inverted)
split_p = !split_p;
if (split_p) {
rb_funcallv(memo->yielder, id_lshift, 1, &memo->prev_elts);
UPDATE_MEMO;
memo->prev_elts = rb_ary_new3(1, i);
}
else {
rb_ary_push(memo->prev_elts, i);
}
memo->prev_elt = i;
}
return Qnil;
#undef UPDATE_MEMO
}
static VALUE
slicewhen_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
{
VALUE enumerable;
VALUE arg;
struct slicewhen_arg *memo =
NEW_PARTIAL_MEMO_FOR(struct slicewhen_arg, arg, inverted);
enumerable = rb_ivar_get(enumerator, id_slicewhen_enum);
memo->pred = rb_attr_get(enumerator, id_slicewhen_pred);
memo->prev_elt = Qundef;
memo->prev_elts = Qnil;
memo->yielder = yielder;
memo->inverted = RTEST(rb_attr_get(enumerator, id_slicewhen_inverted));
rb_block_call(enumerable, id_each, 0, 0, slicewhen_ii, arg);
memo = MEMO_FOR(struct slicewhen_arg, arg);
if (!NIL_P(memo->prev_elts))
rb_funcallv(memo->yielder, id_lshift, 1, &memo->prev_elts);
return Qnil;
}
/*
* call-seq:
* enum.slice_when {|elt_before, elt_after| bool } -> an_enumerator
*
* Creates an enumerator for each chunked elements.
* The beginnings of chunks are defined by the block.
*
* This method splits each chunk using adjacent elements,
* _elt_before_ and _elt_after_,
* in the receiver enumerator.
* This method split chunks between _elt_before_ and _elt_after_ where
* the block returns <code>true</code>.
*
* The block is called the length of the receiver enumerator minus one.
*
* The result enumerator yields the chunked elements as an array.
* So +each+ method can be called as follows:
*
* enum.slice_when { |elt_before, elt_after| bool }.each { |ary| ... }
*
* Other methods of the Enumerator class and Enumerable module,
* such as +to_a+, +map+, etc., are also usable.
*
* For example, one-by-one increasing subsequence can be chunked as follows:
*
* a = [1,2,4,9,10,11,12,15,16,19,20,21]
* b = a.slice_when {|i, j| i+1 != j }
* p b.to_a #=> [[1, 2], [4], [9, 10, 11, 12], [15, 16], [19, 20, 21]]
* c = b.map {|a| a.length < 3 ? a : "#{a.first}-#{a.last}" }
* p c #=> [[1, 2], [4], "9-12", [15, 16], "19-21"]
* d = c.join(",")
* p d #=> "1,2,4,9-12,15,16,19-21"
*
* Near elements (threshold: 6) in sorted array can be chunked as follows:
*
* a = [3, 11, 14, 25, 28, 29, 29, 41, 55, 57]
* p a.slice_when {|i, j| 6 < j - i }.to_a
* #=> [[3], [11, 14], [25, 28, 29, 29], [41], [55, 57]]
*
* Increasing (non-decreasing) subsequence can be chunked as follows:
*
* a = [0, 9, 2, 2, 3, 2, 7, 5, 9, 5]
* p a.slice_when {|i, j| i > j }.to_a
* #=> [[0, 9], [2, 2, 3], [2, 7], [5, 9], [5]]
*
* Adjacent evens and odds can be chunked as follows:
* (Enumerable#chunk is another way to do it.)
*
* a = [7, 5, 9, 2, 0, 7, 9, 4, 2, 0]
* p a.slice_when {|i, j| i.even? != j.even? }.to_a
* #=> [[7, 5, 9], [2, 0], [7, 9], [4, 2, 0]]
*
* Paragraphs (non-empty lines with trailing empty lines) can be chunked as follows:
* (See Enumerable#chunk to ignore empty lines.)
*
* lines = ["foo\n", "bar\n", "\n", "baz\n", "qux\n"]
* p lines.slice_when {|l1, l2| /\A\s*\z/ =~ l1 && /\S/ =~ l2 }.to_a
* #=> [["foo\n", "bar\n", "\n"], ["baz\n", "qux\n"]]
*
* Enumerable#chunk_while does the same, except splitting when the block
* returns <code>false</code> instead of <code>true</code>.
*/
static VALUE
enum_slice_when(VALUE enumerable)
{
VALUE enumerator;
VALUE pred;
pred = rb_block_proc();
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_slicewhen_enum, enumerable);
rb_ivar_set(enumerator, id_slicewhen_pred, pred);
rb_ivar_set(enumerator, id_slicewhen_inverted, Qfalse);
rb_block_call(enumerator, idInitialize, 0, 0, slicewhen_i, enumerator);
return enumerator;
}
/*
* call-seq:
* enum.chunk_while {|elt_before, elt_after| bool } -> an_enumerator
*
* Creates an enumerator for each chunked elements.
* The beginnings of chunks are defined by the block.
*
* This method splits each chunk using adjacent elements,
* _elt_before_ and _elt_after_,
* in the receiver enumerator.
* This method split chunks between _elt_before_ and _elt_after_ where
* the block returns <code>false</code>.
*
* The block is called the length of the receiver enumerator minus one.
*
* The result enumerator yields the chunked elements as an array.
* So +each+ method can be called as follows:
*
* enum.chunk_while { |elt_before, elt_after| bool }.each { |ary| ... }
*
* Other methods of the Enumerator class and Enumerable module,
* such as +to_a+, +map+, etc., are also usable.
*
* For example, one-by-one increasing subsequence can be chunked as follows:
*
* a = [1,2,4,9,10,11,12,15,16,19,20,21]
* b = a.chunk_while {|i, j| i+1 == j }
* p b.to_a #=> [[1, 2], [4], [9, 10, 11, 12], [15, 16], [19, 20, 21]]
* c = b.map {|a| a.length < 3 ? a : "#{a.first}-#{a.last}" }
* p c #=> [[1, 2], [4], "9-12", [15, 16], "19-21"]
* d = c.join(",")
* p d #=> "1,2,4,9-12,15,16,19-21"
*
* Increasing (non-decreasing) subsequence can be chunked as follows:
*
* a = [0, 9, 2, 2, 3, 2, 7, 5, 9, 5]
* p a.chunk_while {|i, j| i <= j }.to_a
* #=> [[0, 9], [2, 2, 3], [2, 7], [5, 9], [5]]
*
* Adjacent evens and odds can be chunked as follows:
* (Enumerable#chunk is another way to do it.)
*
* a = [7, 5, 9, 2, 0, 7, 9, 4, 2, 0]
* p a.chunk_while {|i, j| i.even? == j.even? }.to_a
* #=> [[7, 5, 9], [2, 0], [7, 9], [4, 2, 0]]
*
* Enumerable#slice_when does the same, except splitting when the block
* returns <code>true</code> instead of <code>false</code>.
*/
static VALUE
enum_chunk_while(VALUE enumerable)
{
VALUE enumerator;
VALUE pred;
pred = rb_block_proc();
enumerator = rb_obj_alloc(rb_cEnumerator);
rb_ivar_set(enumerator, id_slicewhen_enum, enumerable);
rb_ivar_set(enumerator, id_slicewhen_pred, pred);
rb_ivar_set(enumerator, id_slicewhen_inverted, Qtrue);
rb_block_call(enumerator, idInitialize, 0, 0, slicewhen_i, enumerator);
return enumerator;
}
struct enum_sum_memo {
VALUE v, r;
long n;
double f, c;
int block_given;
int float_value;
};
static void
sum_iter_normalize_memo(struct enum_sum_memo *memo)
{
assert(FIXABLE(memo->n));
memo->v = rb_fix_plus(LONG2FIX(memo->n), memo->v);
memo->n = 0;
switch (TYPE(memo->r)) {
case T_RATIONAL: memo->v = rb_rational_plus(memo->r, memo->v); break;
case T_UNDEF: break;
default: UNREACHABLE; /* or ...? */
}
memo->r = Qundef;
}
static void
sum_iter_fixnum(VALUE i, struct enum_sum_memo *memo)
{
memo->n += FIX2LONG(i); /* should not overflow long type */
if (! FIXABLE(memo->n)) {
memo->v = rb_big_plus(LONG2NUM(memo->n), memo->v);
memo->n = 0;
}
}
static void
sum_iter_bignum(VALUE i, struct enum_sum_memo *memo)
{
memo->v = rb_big_plus(i, memo->v);
}
static void
sum_iter_rational(VALUE i, struct enum_sum_memo *memo)
{
if (memo->r == Qundef) {
memo->r = i;
}
else {
memo->r = rb_rational_plus(memo->r, i);
}
}
static void
sum_iter_some_value(VALUE i, struct enum_sum_memo *memo)
{
memo->v = rb_funcallv(memo->v, idPLUS, 1, &i);
}
static void
sum_iter_Kahan_Babuska(VALUE i, struct enum_sum_memo *memo)
{
/*
* Kahan-Babuska balancing compensated summation algorithm
* See https://link.springer.com/article/10.1007/s00607-005-0139-x
*/
double x;
switch (TYPE(i)) {
case T_FLOAT: x = RFLOAT_VALUE(i); break;
case T_FIXNUM: x = FIX2LONG(i); break;
case T_BIGNUM: x = rb_big2dbl(i); break;
case T_RATIONAL: x = rb_num2dbl(i); break;
default:
memo->v = DBL2NUM(memo->f);
memo->float_value = 0;
sum_iter_some_value(i, memo);
return;
}
double f = memo->f;
if (isnan(f)) {
return;
}
else if (! isfinite(x)) {
if (isinf(x) && isinf(f) && signbit(x) != signbit(f)) {
i = DBL2NUM(f);
x = nan("");
}
memo->v = i;
memo->f = x;
return;
}
else if (isinf(f)) {
return;
}
double c = memo->c;
double t = f + x;
if (fabs(f) >= fabs(x)) {
c += ((f - t) + x);
}
else {
c += ((x - t) + f);
}
f = t;
memo->f = f;
memo->c = c;
}
static void
sum_iter(VALUE i, struct enum_sum_memo *memo)
{
assert(memo != NULL);
if (memo->block_given) {
i = rb_yield(i);
}
if (memo->float_value) {
sum_iter_Kahan_Babuska(i, memo);
}
else switch (TYPE(memo->v)) {
default: sum_iter_some_value(i, memo); return;
case T_FLOAT: sum_iter_Kahan_Babuska(i, memo); return;
case T_FIXNUM:
case T_BIGNUM:
case T_RATIONAL:
switch (TYPE(i)) {
case T_FIXNUM: sum_iter_fixnum(i, memo); return;
case T_BIGNUM: sum_iter_bignum(i, memo); return;
case T_RATIONAL: sum_iter_rational(i, memo); return;
case T_FLOAT:
sum_iter_normalize_memo(memo);
memo->f = NUM2DBL(memo->v);
memo->c = 0.0;
memo->float_value = 1;
sum_iter_Kahan_Babuska(i, memo);
return;
default:
sum_iter_normalize_memo(memo);
sum_iter_some_value(i, memo);
return;
}
}
}
static VALUE
enum_sum_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
{
ENUM_WANT_SVALUE();
sum_iter(i, (struct enum_sum_memo *) args);
return Qnil;
}
static int
hash_sum_i(VALUE key, VALUE value, VALUE arg)
{
sum_iter(rb_assoc_new(key, value), (struct enum_sum_memo *) arg);
return ST_CONTINUE;
}
static void
hash_sum(VALUE hash, struct enum_sum_memo *memo)
{
assert(RB_TYPE_P(hash, T_HASH));
assert(memo != NULL);
rb_hash_foreach(hash, hash_sum_i, (VALUE)memo);
}
static VALUE
int_range_sum(VALUE beg, VALUE end, int excl, VALUE init)
{
if (excl) {
if (FIXNUM_P(end))
end = LONG2FIX(FIX2LONG(end) - 1);
else
end = rb_big_minus(end, LONG2FIX(1));
}
if (rb_int_ge(end, beg)) {
VALUE a;
a = rb_int_plus(rb_int_minus(end, beg), LONG2FIX(1));
a = rb_int_mul(a, rb_int_plus(end, beg));
a = rb_int_idiv(a, LONG2FIX(2));
return rb_int_plus(init, a);
}
return init;
}
/*
* call-seq:
* enum.sum(init=0) -> number
* enum.sum(init=0) {|e| expr } -> number
*
* Returns the sum of elements in an Enumerable.
*
* If a block is given, the block is applied to each element
* before addition.
*
* If <i>enum</i> is empty, it returns <i>init</i>.
*
* For example:
*
* { 1 => 10, 2 => 20 }.sum {|k, v| k * v } #=> 50
* (1..10).sum #=> 55
* (1..10).sum {|v| v * 2 } #=> 110
* ('a'..'z').sum #=> TypeError
*
* This method can be used for non-numeric objects by
* explicit <i>init</i> argument.
*
* { 1 => 10, 2 => 20 }.sum([]) #=> [1, 10, 2, 20]
* "a\nb\nc".each_line.lazy.map(&:chomp).sum("") #=> "abc"
*
* If the method is applied to an Integer range without a block,
* the sum is not done by iteration, but instead using Gauss's summation
* formula.
*
* Enumerable#sum method may not respect method redefinition of "+"
* methods such as Integer#+, or "each" methods such as Range#each.
*/
static VALUE
enum_sum(int argc, VALUE* argv, VALUE obj)
{
struct enum_sum_memo memo;
VALUE beg, end;
int excl;
memo.v = (rb_check_arity(argc, 0, 1) == 0) ? LONG2FIX(0) : argv[0];
memo.block_given = rb_block_given_p();
memo.n = 0;
memo.r = Qundef;
if ((memo.float_value = RB_FLOAT_TYPE_P(memo.v))) {
memo.f = RFLOAT_VALUE(memo.v);
memo.c = 0.0;
}
else {
memo.f = 0.0;
memo.c = 0.0;
}
if (RTEST(rb_range_values(obj, &beg, &end, &excl))) {
if (!memo.block_given && !memo.float_value &&
(FIXNUM_P(beg) || RB_TYPE_P(beg, T_BIGNUM)) &&
(FIXNUM_P(end) || RB_TYPE_P(end, T_BIGNUM))) {
return int_range_sum(beg, end, excl, memo.v);
}
}
if (RB_TYPE_P(obj, T_HASH) &&
rb_method_basic_definition_p(CLASS_OF(obj), id_each))
hash_sum(obj, &memo);
else
rb_block_call(obj, id_each, 0, 0, enum_sum_i, (VALUE)&memo);
if (memo.float_value) {
return DBL2NUM(memo.f + memo.c);
}
else {
if (memo.n != 0)
memo.v = rb_fix_plus(LONG2FIX(memo.n), memo.v);
if (memo.r != Qundef) {
memo.v = rb_rational_plus(memo.r, memo.v);
}
return memo.v;
}
}
static VALUE
uniq_func(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
ENUM_WANT_SVALUE();
rb_hash_add_new_element(hash, i, i);
return Qnil;
}
static VALUE
uniq_iter(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
{
ENUM_WANT_SVALUE();
rb_hash_add_new_element(hash, rb_yield_values2(argc, argv), i);
return Qnil;
}
/*
* call-seq:
* enum.uniq -> new_ary
* enum.uniq { |item| ... } -> new_ary
*
* Returns a new array by removing duplicate values in +self+.
*
* See also Array#uniq.
*/
static VALUE
enum_uniq(VALUE obj)
{
VALUE hash, ret;
rb_block_call_func *const func =
rb_block_given_p() ? uniq_iter : uniq_func;
hash = rb_obj_hide(rb_hash_new());
rb_block_call(obj, id_each, 0, 0, func, hash);
ret = rb_hash_values(hash);
rb_hash_clear(hash);
return ret;
}
static VALUE
compact_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
{
ENUM_WANT_SVALUE();
if (!NIL_P(i)) {
rb_ary_push(ary, i);
}
return Qnil;
}
/*
* call-seq:
* enum.compact -> array
*
* Returns an array of all non-+nil+ elements from enumeration.
*
* def with_nils
* yield 1
* yield 2
* yield nil
* yield 3
* end
*
* to_enum(:with_nils).compact
* # => [1, 2, 3]
*
* See also Array#compact.
*/
static VALUE
enum_compact(VALUE obj)
{
VALUE ary;
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, compact_i, ary);
return ary;
}
/*
* == What's Here
*
* \Module \Enumerable provides methods that are useful to a collection class for:
* - {Querying}[#module-Enumerable-label-Methods+for+Querying]
* - {Fetching}[#module-Enumerable-label-Methods+for+Fetching]
* - {Searching}[#module-Enumerable-label-Methods+for+Searching]
* - {Sorting}[#module-Enumerable-label-Methods+for+Sorting]
* - {Iterating}[#module-Enumerable-label-Methods+for+Iterating]
* - {And more....}[#module-Enumerable-label-Other+Methods]
*
* === Methods for Querying
*
* These methods return information about the \Enumerable other than the elements themselves:
*
* #include?, #member?:: Returns +true+ if self == object, +false+ otherwise.
* #all?:: Returns +true+ if all elements meet a specified criterion; +false+ otherwise.
* #any?:: Returns +true+ if any element meets a specified criterion; +false+ otherwise.
* #none?:: Returns +true+ if no element meets a specified criterion; +false+ otherwise.
* #one?:: Returns +true+ if exactly one element meets a specified criterion; +false+ otherwise.
* #count:: Returns the count of elements,
* based on an argument or block criterion, if given.
* #tally:: Returns a new \Hash containing the counts of occurrences of each element.
*
* === Methods for Fetching
*
* These methods return entries from the \Enumerable, without modifying it:
*
* <i>Leading, trailing, or all elements</i>:
* #entries, #to_a:: Returns all elements.
* #first:: Returns the first element or leading elements.
* #take:: Returns a specified number of leading elements.
* #drop:: Returns a specified number of trailing elements.
* #take_while:: Returns leading elements as specified by the given block.
* #drop_while:: Returns trailing elements as specified by the given block.
*
* <i>Minimum and maximum value elements</i>:
* #min:: Returns the elements whose values are smallest among the elements,
* as determined by <tt><=></tt> or a given block.
* #max:: Returns the elements whose values are largest among the elements,
* as determined by <tt><=></tt> or a given block.
* #minmax:: Returns a 2-element \Array containing the smallest and largest elements.
* #min_by:: Returns the smallest element, as determined by the given block.
* #max_by:: Returns the largest element, as determined by the given block.
* #minmax_by:: Returns the smallest and largest elements, as determined by the given block.
*
* <i>Groups, slices, and partitions</i>:
* #group_by:: Returns a \Hash that partitions the elements into groups.
* #partition:: Returns elements partitioned into two new Arrays, as determined by the given block.
* #slice_after:: Returns a new \Enumerator whose entries are a partition of +self+,
based either on a given +object+ or a given block.
* #slice_before:: Returns a new \Enumerator whose entries are a partition of +self+,
based either on a given +object+ or a given block.
* #slice_when:: Returns a new \Enumerator whose entries are a partition of +self+
based on the given block.
* #chunk:: Returns elements organized into chunks as specified by the given block.
* #chunk_while:: Returns elements organized into chunks as specified by the given block.
*
* === Methods for Searching and Filtering
*
* These methods return elements that meet a specified criterion.
*
* #find, #detect:: Returns an element selected by the block.
* #find_all, #filter, #select:: Returns elements selected by the block.
* #find_index:: Returns the index of an element selected by a given object or block.
* #reject:: Returns elements not rejected by the block.
* #uniq:: Returns elements that are not duplicates.
*
* === Methods for Sorting
*
* These methods return elements in sorted order.
*
* #sort:: Returns the elements, sorted by <tt><=></tt> or the given block.
* #sort_by:: Returns the elements, sorted by the given block.
*
* === Methods for Iterating
*
* #each_entry:: Calls the block with each successive element
* (slightly different from #each).
* #each_with_index:: Calls the block with each successive element and its index.
* #each_with_object:: Calls the block with each successive element and a given object.
* #each_slice:: Calls the block with successive non-overlapping slices.
* #each_cons:: Calls the block with successive overlapping slices.
* (different from #each_slice).
* #reverse_each:: Calls the block with each successive element, in reverse order.
*
* === Other Methods
*
* #map, #collect:: Returns objects returned by the block.
* #filter_map:: Returns truthy objects returned by the block.
* #flat_map, #collect_concat:: Returns flattened objects returned by the block.
* #grep:: Returns elements selected by a given object
* or objects returned by a given block.
* #grep_v:: Returns elements selected by a given object
* or objects returned by a given block.
* #reduce, #inject:: Returns the object formed by combining all elements.
* #sum:: Returns the sum of the elements, using method +++.
* #zip:: Combines each element with elements from other enumerables;
* returns the n-tuples or calls the block with each.
* #cycle:: Calls the block with each element, cycling repeatedly.
*
* == Usage
*
* To use module \Enumerable in a collection class:
* - Include it:
* include Enumerable
* - Implement method <tt>#each</tt>
* which must yield successive elements of the collection.
* This method will be called by almost any \Enumerable method.
*
* == \Enumerable in Ruby Core Classes
* Some Ruby classes include \Enumerable:
* - Array
* - Dir
* - Hash
* - IO
* - Range
* - Set
* - Struct
* Virtually all methods in \Enumerable call method +#each+ in the including class:
* - <tt>Hash#each</tt> yields the next key-value pair as a 2-element \Array.
* - <tt>Struct#each</tt> yields the next name-value pair as a 2-element \Array.
* - For the other classes above, +#each+ yields the next object from the collection.
*
* == About the Examples
* The example code snippets for the \Enumerable methods:
* - Always show the use of one or more \Array-like classes (often \Array itself).
* - Sometimes show the use of a \Hash-like class.
* For some methods, though, the usage would not make sense,
* and so it is not shown. Example: #tally would find exactly one of each \Hash entry.
*/
void
Init_Enumerable(void)
{
rb_mEnumerable = rb_define_module("Enumerable");
rb_define_method(rb_mEnumerable, "to_a", enum_to_a, -1);
rb_define_method(rb_mEnumerable, "entries", enum_to_a, -1);
rb_define_method(rb_mEnumerable, "to_h", enum_to_h, -1);
rb_define_method(rb_mEnumerable, "sort", enum_sort, 0);
rb_define_method(rb_mEnumerable, "sort_by", enum_sort_by, 0);
rb_define_method(rb_mEnumerable, "grep", enum_grep, 1);
rb_define_method(rb_mEnumerable, "grep_v", enum_grep_v, 1);
rb_define_method(rb_mEnumerable, "count", enum_count, -1);
rb_define_method(rb_mEnumerable, "find", enum_find, -1);
rb_define_method(rb_mEnumerable, "detect", enum_find, -1);
rb_define_method(rb_mEnumerable, "find_index", enum_find_index, -1);
rb_define_method(rb_mEnumerable, "find_all", enum_find_all, 0);
rb_define_method(rb_mEnumerable, "select", enum_find_all, 0);
rb_define_method(rb_mEnumerable, "filter", enum_find_all, 0);
rb_define_method(rb_mEnumerable, "filter_map", enum_filter_map, 0);
rb_define_method(rb_mEnumerable, "reject", enum_reject, 0);
rb_define_method(rb_mEnumerable, "collect", enum_collect, 0);
rb_define_method(rb_mEnumerable, "map", enum_collect, 0);
rb_define_method(rb_mEnumerable, "flat_map", enum_flat_map, 0);
rb_define_method(rb_mEnumerable, "collect_concat", enum_flat_map, 0);
rb_define_method(rb_mEnumerable, "inject", enum_inject, -1);
rb_define_method(rb_mEnumerable, "reduce", enum_inject, -1);
rb_define_method(rb_mEnumerable, "partition", enum_partition, 0);
rb_define_method(rb_mEnumerable, "group_by", enum_group_by, 0);
rb_define_method(rb_mEnumerable, "tally", enum_tally, -1);
rb_define_method(rb_mEnumerable, "first", enum_first, -1);
rb_define_method(rb_mEnumerable, "all?", enum_all, -1);
rb_define_method(rb_mEnumerable, "any?", enum_any, -1);
rb_define_method(rb_mEnumerable, "one?", enum_one, -1);
rb_define_method(rb_mEnumerable, "none?", enum_none, -1);
rb_define_method(rb_mEnumerable, "min", enum_min, -1);
rb_define_method(rb_mEnumerable, "max", enum_max, -1);
rb_define_method(rb_mEnumerable, "minmax", enum_minmax, 0);
rb_define_method(rb_mEnumerable, "min_by", enum_min_by, -1);
rb_define_method(rb_mEnumerable, "max_by", enum_max_by, -1);
rb_define_method(rb_mEnumerable, "minmax_by", enum_minmax_by, 0);
rb_define_method(rb_mEnumerable, "member?", enum_member, 1);
rb_define_method(rb_mEnumerable, "include?", enum_member, 1);
rb_define_method(rb_mEnumerable, "each_with_index", enum_each_with_index, -1);
rb_define_method(rb_mEnumerable, "reverse_each", enum_reverse_each, -1);
rb_define_method(rb_mEnumerable, "each_entry", enum_each_entry, -1);
rb_define_method(rb_mEnumerable, "each_slice", enum_each_slice, 1);
rb_define_method(rb_mEnumerable, "each_cons", enum_each_cons, 1);
rb_define_method(rb_mEnumerable, "each_with_object", enum_each_with_object, 1);
rb_define_method(rb_mEnumerable, "zip", enum_zip, -1);
rb_define_method(rb_mEnumerable, "take", enum_take, 1);
rb_define_method(rb_mEnumerable, "take_while", enum_take_while, 0);
rb_define_method(rb_mEnumerable, "drop", enum_drop, 1);
rb_define_method(rb_mEnumerable, "drop_while", enum_drop_while, 0);
rb_define_method(rb_mEnumerable, "cycle", enum_cycle, -1);
rb_define_method(rb_mEnumerable, "chunk", enum_chunk, 0);
rb_define_method(rb_mEnumerable, "slice_before", enum_slice_before, -1);
rb_define_method(rb_mEnumerable, "slice_after", enum_slice_after, -1);
rb_define_method(rb_mEnumerable, "slice_when", enum_slice_when, 0);
rb_define_method(rb_mEnumerable, "chunk_while", enum_chunk_while, 0);
rb_define_method(rb_mEnumerable, "sum", enum_sum, -1);
rb_define_method(rb_mEnumerable, "uniq", enum_uniq, 0);
rb_define_method(rb_mEnumerable, "compact", enum_compact, 0);
id__alone = rb_intern_const("_alone");
id__separator = rb_intern_const("_separator");
id_chunk_categorize = rb_intern_const("chunk_categorize");
id_chunk_enumerable = rb_intern_const("chunk_enumerable");
id_next = rb_intern_const("next");
id_sliceafter_enum = rb_intern_const("sliceafter_enum");
id_sliceafter_pat = rb_intern_const("sliceafter_pat");
id_sliceafter_pred = rb_intern_const("sliceafter_pred");
id_slicebefore_enumerable = rb_intern_const("slicebefore_enumerable");
id_slicebefore_sep_pat = rb_intern_const("slicebefore_sep_pat");
id_slicebefore_sep_pred = rb_intern_const("slicebefore_sep_pred");
id_slicewhen_enum = rb_intern_const("slicewhen_enum");
id_slicewhen_inverted = rb_intern_const("slicewhen_inverted");
id_slicewhen_pred = rb_intern_const("slicewhen_pred");
}