From 766df600db46f3cc8a2bd0c0af2dfceeec2d8fb3 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 14 Feb 2009 15:45:43 +0000
Subject: * array.c (rb_ary_uniq_bang, rb_ary_uniq): unique by the result of  
 given block.  [ruby-dev:37998]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22307 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 array.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 74 insertions(+), 17 deletions(-)

(limited to 'array.c')

diff --git a/array.c b/array.c
index 5a6ceebea9..70d18543e6 100644
--- a/array.c
+++ b/array.c
@@ -2887,15 +2887,43 @@ ary_add_hash(VALUE hash, VALUE ary)
     return hash;
 }
 
-static VALUE
-ary_make_hash(VALUE ary)
+static inline VALUE
+ary_tmp_hash_new(void)
 {
     VALUE hash = rb_hash_new();
 
     RBASIC(hash)->klass = 0;
+    return hash;
+}
+
+static VALUE
+ary_make_hash(VALUE ary)
+{
+    VALUE hash = ary_tmp_hash_new();
     return ary_add_hash(hash, ary);
 }
 
+static VALUE
+ary_add_hash_by(VALUE hash, VALUE ary)
+{
+    long i;
+
+    for (i = 0; i < RARRAY_LEN(ary); ++i) {
+	VALUE v = rb_ary_elt(ary, i), k = rb_yield(v);
+	if (rb_hash_lookup2(hash, k, Qundef) == Qundef) {
+	    rb_hash_aset(hash, k, v);
+	}
+    }
+    return hash;
+}
+
+static VALUE
+ary_make_hash_by(VALUE ary)
+{
+    VALUE hash = ary_tmp_hash_new();
+    return ary_add_hash_by(hash, ary);
+}
+
 static inline void
 ary_recycle_hash(VALUE hash)
 {
@@ -3010,6 +3038,13 @@ rb_ary_or(VALUE ary1, VALUE ary2)
     return ary3;
 }
 
+static int
+push_value(st_data_t key, st_data_t val, st_data_t ary)
+{
+    rb_ary_push((VALUE)ary, (VALUE)val);
+    return ST_CONTINUE;
+}
+
 /*
  *  call-seq:
  *     array.uniq! -> array or nil
@@ -3022,6 +3057,8 @@ rb_ary_or(VALUE ary1, VALUE ary2)
  *     a.uniq!   #=> ["a", "b", "c"]
  *     b = [ "a", "b", "c" ]
  *     b.uniq!   #=> nil
+ *     c = [ "a:def", "a:xyz", "b:abc", "b:xyz", "c:jkl" ]
+ *     c.uniq! {|s| s[/^\w+/]}  #=> [ "a:def", "b:abc", "c:jkl" ] 
  */
 
 static VALUE
@@ -3030,18 +3067,28 @@ rb_ary_uniq_bang(VALUE ary)
     VALUE hash, v;
     long i, j;
 
-    hash = ary_make_hash(ary);
-
-    if (RARRAY_LEN(ary) == RHASH_SIZE(hash)) {
-	return Qnil;
+    if (rb_block_given_p()) {
+	hash = ary_make_hash_by(ary);
+	if (RARRAY_LEN(ary) == (i = RHASH_SIZE(hash))) {
+	    return Qnil;
+	}
+	ary_resize_capa(ary, i);
+	ARY_SET_LEN(ary, 0);
+	st_foreach(RHASH_TBL(hash), push_value, ary);
     }
-    for (i=j=0; i<RARRAY_LEN(ary); i++) {
-	st_data_t vv = (st_data_t)(v = rb_ary_elt(ary, i));
-	if (st_delete(RHASH_TBL(hash), &vv, 0)) {
-	    rb_ary_store(ary, j++, v);
+    else {
+	hash = ary_make_hash(ary);
+	if (RARRAY_LEN(ary) == RHASH_SIZE(hash)) {
+	    return Qnil;
 	}
+	for (i=j=0; i<RARRAY_LEN(ary); i++) {
+	    st_data_t vv = (st_data_t)(v = rb_ary_elt(ary, i));
+	    if (st_delete(RHASH_TBL(hash), &vv, 0)) {
+		rb_ary_store(ary, j++, v);
+	    }
+	}
+	ARY_SET_LEN(ary, j);
     }
-    ARY_SET_LEN(ary, j);
     ary_recycle_hash(hash);
 
     return ary;
@@ -3055,19 +3102,29 @@ rb_ary_uniq_bang(VALUE ary)
  *     
  *     a = [ "a", "a", "b", "b", "c" ]
  *     a.uniq   #=> ["a", "b", "c"]
+ *     c = [ "a:def", "a:xyz", "b:abc", "b:xyz", "c:jkl" ]
+ *     c.uniq {|s| s[/^\w+/]}  #=> [ "a:def", "b:abc", "c:jkl" ] 
  */
 
 static VALUE
 rb_ary_uniq(VALUE ary)
 {
-    VALUE hash = ary_make_hash(ary), v;
-    VALUE uniq = ary_new(rb_obj_class(ary), RHASH_SIZE(hash));
+    VALUE hash, uniq, v;
     long i;
 
-    for (i=0; i<RARRAY_LEN(ary); i++) {
-	st_data_t vv = (st_data_t)(v = rb_ary_elt(ary, i));
-	if (st_delete(RHASH_TBL(hash), &vv, 0)) {
-	    rb_ary_push(uniq, v);
+    if (rb_block_given_p()) {
+	hash = ary_make_hash_by(ary);
+	uniq = ary_new(rb_obj_class(ary), RHASH_SIZE(hash));
+	st_foreach(RHASH_TBL(hash), push_value, uniq);
+    }
+    else {
+	hash = ary_make_hash(ary);
+	uniq = ary_new(rb_obj_class(ary), RHASH_SIZE(hash));
+	for (i=0; i<RARRAY_LEN(ary); i++) {
+	    st_data_t vv = (st_data_t)(v = rb_ary_elt(ary, i));
+	    if (st_delete(RHASH_TBL(hash), &vv, 0)) {
+		rb_ary_push(uniq, v);
+	    }
 	}
     }
     ary_recycle_hash(hash);
-- 
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