Run string replace regexp with function in C++ code loop.

src/regexp-delay.js

Index: src/regexp-delay.js
diff --git a/src/regexp-delay.js b/src/regexp-delay.js
index e2492f7245b24ba8d1082d0bbcf94a99e309add7..dc1b0429f7094c5c4fe80d5af5515c8fd2e5fb91 100644
--- a/src/regexp-delay.js
+++ b/src/regexp-delay.js
@@ -344,6 +344,7 @@ function RegExpToString() {
 // on the captures array of the last successful match and the subject string
 // of the last successful match.
 function RegExpGetLastMatch() {
+  if (lastMatchInfoOverride) { return lastMatchInfoOverride[0]; }
   var regExpSubject = LAST_SUBJECT(lastMatchInfo);
   return SubString(regExpSubject,
                    lastMatchInfo[CAPTURE0],
@@ -352,6 +353,11 @@ function RegExpGetLastMatch() {
 
 
 function RegExpGetLastParen() {
+  if (lastMatchInfoOverride) {
+    var override = lastMatchInfoOverride;
+    if (override.length <= 3) return ''; 
+    return override[override.length - 3];
+  }
   var length = NUMBER_OF_CAPTURES(lastMatchInfo);
   if (length <= 2) return '';  // There were no captures.
   // We match the SpiderMonkey behavior: return the substring defined by the
@@ -368,17 +374,32 @@ function RegExpGetLastParen() {
 
 
 function RegExpGetLeftContext() {
-  return SubString(LAST_SUBJECT(lastMatchInfo),
-                   0,
-                   lastMatchInfo[CAPTURE0]);
+  var start_index;
+  var subject;
+  if (!lastMatchInfoOverride) {
+    start_index = lastMatchInfo[CAPTURE0];
+    subject = LAST_SUBJECT(lastMatchInfo);
+  } else {
+    var override = lastMatchInfoOverride;
+    start_index = override[override.length - 2];
+    subject = override[override.length - 1];
+  }
+  return SubString(subject, 0, start_index);
 }
 
 
 function RegExpGetRightContext() {
-  var subject = LAST_SUBJECT(lastMatchInfo);
-  return SubString(subject,
-                   lastMatchInfo[CAPTURE1],
-                   subject.length);
+  var start_index;
+  var subject;
+  if (!lastMatchInfoOverride) {
+    start_index = lastMatchInfo[CAPTURE1];
+    subject = LAST_SUBJECT(lastMatchInfo);
+  } else {
+    var override = lastMatchInfoOverride;
+    subject = override[override.length - 1];
+    start_index = override[override.length - 2] + subject.length;
+  }
+  return SubString(subject, start_index, subject.length);
 }
 
 
@@ -387,6 +408,10 @@ function RegExpGetRightContext() {
 // called with indices from 1 to 9.
 function RegExpMakeCaptureGetter(n) {
   return function() {
+    if (lastMatchInfoOverride) {
+      if (n < lastMatchInfoOverride.length - 2) return lastMatchInfoOverride[n];
+      return '';
+    }
     var index = n * 2;
     if (index >= NUMBER_OF_CAPTURES(lastMatchInfo)) return '';
     var matchStart = lastMatchInfo[CAPTURE(index)];
@@ -411,6 +436,12 @@ var lastMatchInfo = [
     0,                 // REGEXP_FIRST_CAPTURE + 1
 ];
 
+// Override last match info with an array of actual substrings.
+// Used internally by replace regexp with function.
+// The array has the format of an "apply" argument for a replacement 
+// function. 
+var lastMatchInfoOverride = null;
+
 // -------------------------------------------------------------------
 
 function SetupRegExp() {