From b2420d8ffa4d347a75efbbdc376f4ce65c0eb172 Mon Sep 17 00:00:00 2001
From: Yukihiro Matsumoto <matz@ruby-lang.org>
Date: Mon, 10 Apr 1995 18:36:06 +0900
Subject: version 0.73
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https://cache.ruby-lang.org/pub/ruby/1.0/ruby-0.73.tar.gz

Mon Apr 10 18:36:06 1995  Yukihiro Matsumoto  (matz@ix-02)

	* version 0.73

Fri Apr  7 13:51:08 1995  Yukihiro Matsumoto  (matz@ix-02)

	* cons.c->assoc.c: consの余計な機能は外してpairとしての機能だけを
	  残した．enumerableをincludeするのもやめた．

	* string.c(esub): 文字列置換イテレータ．perlのs///eの相当する．
---
 string.c | 46 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 43 insertions(+), 3 deletions(-)

(limited to 'string.c')

diff --git a/string.c b/string.c
index 73c1678974..c733faf9e4 100644
--- a/string.c
+++ b/string.c
@@ -674,15 +674,14 @@ str_sub(str, pat, val, once)
     VALUE val;
     int once;
 {
-    VALUE sub;
     int beg, end, offset, n;
 
     for (offset=0, n=0;
 	 (beg=research(pat, str, offset)) >= 0;
 	 offset=BEG(0)+STRLEN(val)) {
 	end = END(0)-1;
-	sub = re_regsub(val);
-	str_replace2(str, beg, end, sub);
+	val = re_regsub(val);
+	str_replace2(str, beg, END(0)-1, val);
 	n++;
 	if (once) break;
     }
@@ -811,6 +810,37 @@ Fstr_gsub(str, pat, val)
     return Fstr_sub_internal(str, pat, val, 0);
 }
 
+static VALUE
+Fstr_esub(str, pat)
+    VALUE str, pat;
+{
+    VALUE val;
+    int beg, end, offset, n;
+
+    str_modify(str);
+    switch (TYPE(pat)) {
+      case T_REGEXP:
+	break;
+
+      case T_STRING:
+	pat = re_regcomp(pat);
+	break;
+
+      default:
+	/* type failed */
+	Check_Type(pat, T_REGEXP);
+    }
+
+    offset=0;
+    while ((beg=research(pat, str, offset)) >= 0) {
+	val = rb_yield(re_nth_match(0));
+	val = obj_as_string(val);
+	str_replace2(str, beg, END(0)-1, val);
+	offset=BEG(0)+STRLEN(val);
+    }
+    return (VALUE)str;
+}
+
 extern VALUE rb_lastline;
 
 static VALUE
@@ -829,6 +859,14 @@ Fgsub(obj, pat, val)
     return Fstr_sub_internal(rb_lastline, pat, val, 0);
 }
 
+static VALUE
+Fesub(obj, pat)
+    VALUE obj, pat;
+{
+    Check_Type(rb_lastline, T_STRING);
+    return Fstr_esub(rb_lastline, pat);
+}
+
 static VALUE
 Fstr_reverse(str)
     struct RString *str;
@@ -1669,6 +1707,7 @@ Init_String()
 
     rb_define_method(C_String, "sub", Fstr_sub, 2);
     rb_define_method(C_String, "gsub", Fstr_gsub, 2);
+    rb_define_method(C_String, "esub", Fstr_esub, 1);
     rb_define_method(C_String, "chop", Fstr_chop, 0);
     rb_define_method(C_String, "strip", Fstr_strip, 0);
 
@@ -1684,6 +1723,7 @@ Init_String()
 
     rb_define_private_method(C_Kernel, "sub", Fsub, 2);
     rb_define_private_method(C_Kernel, "gsub", Fgsub, 2);
+    rb_define_private_method(C_Kernel, "esub", Fesub, 1);
 
     pr_str = rb_intern("to_s");
 }
-- 
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