From 78a59da8bc242413c58723203aa007d0f3beecf0 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 3 Feb 2010 01:29:44 +0000
Subject: * enumerator.c: move implementation of each_slice, each_cons,  
 each_with_object to enum.c.

* enum.c (each_slice_i): convert multiple values from yield into
  an array.

* enum.c (each_cons_i): ditto.

* enum.c (each_with_object_i): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26546 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 enum.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)

(limited to 'enum.c')

diff --git a/enum.c b/enum.c
index c6cc0ad00c..6eeb62cd6b 100644
--- a/enum.c
+++ b/enum.c
@@ -1655,6 +1655,147 @@ enum_each_entry(int argc, VALUE *argv, VALUE obj)
     return obj;
 }
 
+static VALUE
+each_slice_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
+{
+    VALUE ary = memo[0];
+    VALUE v = Qnil;
+    long size = (long)memo[1];
+    ENUM_WANT_SVALUE();
+
+    rb_ary_push(ary, i);
+
+    if (RARRAY_LEN(ary) == size) {
+	v = rb_yield(ary);
+	memo[0] = rb_ary_new2(size);
+    }
+
+    return v;
+}
+
+/*
+ *  call-seq:
+ *    e.each_slice(n) {...}
+ *    e.each_slice(n)
+ *
+ *  Iterates the given block for each slice of <n> elements.  If no
+ *  block is given, returns an enumerator.
+ *
+ *  e.g.:
+ *      (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 args[2], ary;
+
+    if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
+    RETURN_ENUMERATOR(obj, 1, &n);
+    args[0] = rb_ary_new2(size);
+    args[1] = (VALUE)size;
+
+    rb_block_call(obj, id_each, 0, 0, each_slice_i, (VALUE)args);
+
+    ary = args[0];
+    if (RARRAY_LEN(ary) > 0) rb_yield(ary);
+
+    return Qnil;
+}
+
+static VALUE
+each_cons_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
+{
+    VALUE ary = memo[0];
+    VALUE v = Qnil;
+    long size = (long)memo[1];
+    ENUM_WANT_SVALUE();
+
+    if (RARRAY_LEN(ary) == size) {
+	rb_ary_shift(ary);
+    }
+    rb_ary_push(ary, i);
+    if (RARRAY_LEN(ary) == size) {
+	v = rb_yield(rb_ary_dup(ary));
+    }
+    return v;
+}
+
+/*
+ *  call-seq:
+ *    each_cons(n) {...}
+ *    each_cons(n)
+ *
+ *  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);
+    VALUE args[2];
+
+    if (size <= 0) rb_raise(rb_eArgError, "invalid size");
+    RETURN_ENUMERATOR(obj, 1, &n);
+    args[0] = rb_ary_new2(size);
+    args[1] = (VALUE)size;
+
+    rb_block_call(obj, id_each, 0, 0, each_cons_i, (VALUE)args);
+
+    return Qnil;
+}
+
+static VALUE
+each_with_object_i(VALUE i, VALUE memo, int argc, VALUE *argv)
+{
+    ENUM_WANT_SVALUE();
+    return rb_yield_values(2, i, memo);
+}
+
+/*
+ *  call-seq:
+ *    each_with_object(obj) {|(*args), memo_obj| ... }
+ *    each_with_object(obj)
+ *
+ *  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.
+ *
+ *  e.g.:
+ *      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_ENUMERATOR(obj, 1, &memo);
+
+    rb_block_call(obj, id_each, 0, 0, each_with_object_i, memo);
+
+    return memo;
+}
+
 static VALUE
 zip_ary(VALUE val, NODE *memo, int argc, VALUE *argv)
 {
@@ -2474,6 +2615,9 @@ Init_Enumerable(void)
     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);
-- 
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