Experimental support for RegExp lookbehind.

test/cctest/test-regexp.cc

Index: test/cctest/test-regexp.cc
diff --git a/test/cctest/test-regexp.cc b/test/cctest/test-regexp.cc
index 2e236c20f3188fcde73cc1b0a7d71cabf8cc8c18..a2ae77d9d0dac9241b7d203e47ace454851bb1dd 100644
--- a/test/cctest/test-regexp.cc
+++ b/test/cctest/test-regexp.cc
@@ -160,6 +160,8 @@ static MinMaxPair CheckMinMaxMatch(const char* input) {
   }
 
 TEST(Parser) {
+  FLAG_harmony_regexp_lookbehind = true;

[erikcorry, 2015/11/11 15:39:04]

Probably better to put this whole test in a static function that takes a bool,
and call it:

TEST(Parser) {
  RegexpParserTest(true);
  RegexpParserTest(false);
}

[Yang, 2015/11/12 08:25:35]

Done.

+
   CHECK_PARSE_ERROR("?");
 
   CheckParseEq("abc", "'abc'");
@@ -191,6 +193,8 @@ TEST(Parser) {
   CheckParseEq("foo|(bar|baz)|quux", "(| 'foo' (^ (| 'bar' 'baz')) 'quux')");
   CheckParseEq("foo(?=bar)baz", "(: 'foo' (-> + 'bar') 'baz')");
   CheckParseEq("foo(?!bar)baz", "(: 'foo' (-> - 'bar') 'baz')");
+  CheckParseEq("foo(?<=bar)baz", "(: 'foo' (<- + 'bar') 'baz')");
+  CheckParseEq("foo(?<!bar)baz", "(: 'foo' (<- - 'bar') 'baz')");
   CheckParseEq("()", "(^ %)");
   CheckParseEq("(?=)", "(-> + %)");
   CheckParseEq("[]", "^[\\x00-\\uffff]");  // Doesn't compile on windows
@@ -260,16 +264,17 @@ TEST(Parser) {
                "(: (^ 'x') (^ 'x') (^ 'x') (^ 'x') (^ 'x') (^ 'x')"
                " (^ 'x') (^ 'x') (^ 'x') (^ 'x') '\\x09')");
   CheckParseEq("(a)\\1", "(: (^ 'a') (<- 1))");
-  CheckParseEq("(a\\1)", "(^ 'a')");
-  CheckParseEq("(\\1a)", "(^ 'a')");
+  CheckParseEq("(a\\1)", "(^ (: 'a' (<- 1)))");
+  CheckParseEq("(\\1a)", "(^ (: (<- 1) 'a'))");
   CheckParseEq("(?=a)?a", "'a'");
   CheckParseEq("(?=a){0,10}a", "'a'");
   CheckParseEq("(?=a){1,10}a", "(: (-> + 'a') 'a')");
   CheckParseEq("(?=a){9,10}a", "(: (-> + 'a') 'a')");
   CheckParseEq("(?!a)?a", "'a'");
-  CheckParseEq("\\1(a)", "(^ 'a')");
+  CheckParseEq("\\1(a)", "(: (<- 1) (^ 'a'))");
   CheckParseEq("(?!(a))\\1", "(: (-> - (^ 'a')) (<- 1))");
-  CheckParseEq("(?!\\1(a\\1)\\1)\\1", "(: (-> - (: (^ 'a') (<- 1))) (<- 1))");
+  CheckParseEq("(?!\\1(a\\1)\\1)\\1",
+               "(: (-> - (: (<- 1) (^ (: 'a' (<- 1))) (<- 1))) (<- 1))");
   CheckParseEq("[\\0]", "[\\x00]");
   CheckParseEq("[\\11]", "[\\x09]");
   CheckParseEq("[\\11a]", "[\\x09 a]");
@@ -1388,7 +1393,7 @@ TEST(MacroAssembler) {
   m.Fail();
   m.Bind(&start);
   m.PushBacktrack(&fail);
-  m.CheckNotAtStart(NULL);
+  m.CheckNotAtStart(0, NULL);
   m.LoadCurrentCharacter(0, NULL);
   m.CheckNotCharacter('f', NULL);
   m.LoadCurrentCharacter(1, NULL);