v8/test/mjsunit/regexp-capture-3.js

// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

function oneMatch(re) {
  "abcd".replace(re, function() { });
  assertEquals("abcd", RegExp.input);
  assertEquals("a", RegExp.leftContext);
  assertEquals("b", RegExp.lastMatch);
  assertEquals("", RegExp.lastParen);
  assertEquals(undefined, RegExp.lastIndex);
  assertEquals(undefined, RegExp.index);
  assertEquals("cd", RegExp.rightContext);
  for (var i = 1; i < 10; i++) {
    assertEquals("", RegExp['$' + i]);
  }
}

oneMatch(/b/);
oneMatch(/b/g);

"abcdabcd".replace(/b/g, function() { });
assertEquals("abcdabcd", RegExp.input);
assertEquals("abcda", RegExp.leftContext);
assertEquals("b", RegExp.lastMatch);
assertEquals("", RegExp.lastParen);
assertEquals(undefined, RegExp.lastIndex);
assertEquals(undefined, RegExp.index);
assertEquals("cd", RegExp.rightContext);
for (var i = 1; i < 10; i++) {
  assertEquals("", RegExp['$' + i]);
}

function captureMatch(re) {
  "abcd".replace(re, function() { });
  assertEquals("abcd", RegExp.input);
  assertEquals("a", RegExp.leftContext);
  assertEquals("bc", RegExp.lastMatch);
  assertEquals("c", RegExp.lastParen);
  assertEquals(undefined, RegExp.lastIndex);
  assertEquals(undefined, RegExp.index);
  assertEquals("d", RegExp.rightContext);
  assertEquals('b', RegExp.$1);
  assertEquals('c', RegExp.$2);
  for (var i = 3; i < 10; i++) {
    assertEquals("", RegExp['$' + i]);
  }
}

captureMatch(/(b)(c)/);
captureMatch(/(b)(c)/g);

"abcdabcd".replace(/(b)(c)/g, function() { });
assertEquals("abcdabcd", RegExp.input);
assertEquals("abcda", RegExp.leftContext);
assertEquals("bc", RegExp.lastMatch);
assertEquals("c", RegExp.lastParen);
assertEquals(undefined, RegExp.lastIndex);
assertEquals(undefined, RegExp.index);
assertEquals("d", RegExp.rightContext);
assertEquals('b', RegExp.$1);
assertEquals('c', RegExp.$2);
for (var i = 3; i < 10; i++) {
  assertEquals("", RegExp['$' + i]);
}


function Override() {
  // Set the internal lastMatchInfoOverride.  After calling this we do a normal
  // match and verify the override was cleared and that we record the new
  // captures.
  "abcdabcd".replace(/(b)(c)/g, function() { });
}


function TestOverride(input, expect, property, re_src) {
  var re = new RegExp(re_src);
  var re_g = new RegExp(re_src, "g");

  function OverrideCase(fn) {
    Override();
    fn();
    assertEquals(expect, RegExp[property]);
  }

  OverrideCase(function() { return input.replace(re, "x"); });
  OverrideCase(function() { return input.replace(re_g, "x"); });
  OverrideCase(function() { return input.replace(re, ""); });
  OverrideCase(function() { return input.replace(re_g, ""); });
  OverrideCase(function() { return input.match(re); });
  OverrideCase(function() { return input.match(re_g); });
  OverrideCase(function() { return re.test(input); });
  OverrideCase(function() { return re_g.test(input); });
}

var input = "bar.foo baz......";
var re_str = "(ba.).*?f";
TestOverride(input, "bar", "$1", re_str);

input = "foo bar baz";
var re_str = "bar";
TestOverride(input, "bar", "$&", re_str);


function no_last_match(fn) {
  fn();
  assertEquals("hestfisk", RegExp.$1);
}

/(hestfisk)/.test("There's no such thing as a hestfisk!");

no_last_match(function() { "foo".replace("f", ""); });
no_last_match(function() { "foo".replace("f", "f"); });
no_last_match(function() { "foo".split("o"); });

var base = "In the music.  In the music.  ";
var cons = base + base + base + base;
no_last_match(function() { cons.replace("x", "y"); });
no_last_match(function() { cons.replace("e", "E"); });


// Here's one that matches once, then tries to match again, but fails.
// Verify that the last match info is from the last match, not from the
// failure that came after.
"bar.foo baz......".replace(/(ba.).*?f/g, function() { return "x";});
assertEquals("bar", RegExp.$1);


// A test that initially does a zero width match, but later does a non-zero
// width match.
var a = "foo bar baz".replace(/^|bar/g, "");
assertEquals("foo  baz", a);

a = "foo bar baz".replace(/^|bar/g, "*");
assertEquals("*foo * baz", a);

// We test FilterASCII using regexps that will backtrack forever.  Since
// a regexp with a non-ASCII character in it can never match an ASCII
// string we can test that the relevant node is removed by verifying that
// there is no hang.
function NoHang(re) {
  print(re);
  "This is an ASCII string that could take forever".match(re);
}


NoHang(/(((.*)*)*x)å/);  // Continuation after loop is filtered, so is loop.
NoHang(/(((.*)*)*å)foo/);  // Body of loop filtered.
NoHang(/å(((.*)*)*x)/);   // Everything after a filtered character is filtered.
NoHang(/(((.*)*)*x)å/);   // Everything before a filtered character is filtered.
NoHang(/[æøå](((.*)*)*x)/);   // Everything after a filtered class is filtered.
NoHang(/(((.*)*)*x)[æøå]/);   // Everything before a filtered class is filtered.
NoHang(/[^\x00-\x7f](((.*)*)*x)/);   // After negated class.
NoHang(/(((.*)*)*x)[^\x00-\x7f]/);   // Before negated class.
NoHang(/(?!(((.*)*)*x)å)foo/);  // Negative lookahead is filtered.
NoHang(/(?!(((.*)*)*x))å/);  // Continuation branch of negative lookahead.
NoHang(/(?=(((.*)*)*x)å)foo/);  // Positive lookahead is filtered.
NoHang(/(?=(((.*)*)*x))å/);  // Continuation branch of positive lookahead.
NoHang(/(?=å)(((.*)*)*x)/);  // Positive lookahead also prunes continuation.
NoHang(/(æ|ø|å)(((.*)*)*x)/);  // All branches of alternation are filtered.
NoHang(/(a|b|(((.*)*)*x))å/);  // 1 out of 3 branches pruned.
NoHang(/(a|(((.*)*)*x)ø|(((.*)*)*x)å)/);  // 2 out of 3 branches pruned.

var s = "Don't prune based on a repetition of length 0";
assertEquals(null, s.match(/å{1,1}prune/));
assertEquals("prune", (s.match(/å{0,0}prune/)[0]));

// Some very deep regexps where FilterASCII gives up in order not to make the
// stack overflow.
var regex6 = /a*\u0100*\w/;
var input0 = "a";
regex6.exec(input0);

var re = "\u0100*\\w";

for (var i = 0; i < 200; i++) re = "a*" + re;

var regex7 = new RegExp(re);
regex7.exec(input0);

var regex8 = new RegExp(re, "i");
regex8.exec(input0);

re = "[\u0100]*\\w";
for (var i = 0; i < 200; i++) re = "a*" + re;

var regex9 = new RegExp(re);
regex9.exec(input0);

var regex10 = new RegExp(re, "i");
regex10.exec(input0);

var regex11 = /^(?:[^\u0000-\u0080]|[0-9a-z?,.!&\s#()])+$/i;
regex11.exec(input0);

var regex12 = /u(\xf0{8}?\D*?|( ? !)$h??(|)*?(||)+?\6((?:\W\B|--\d-*-|)?$){0, }?|^Y( ? !1)\d+)+a/;
regex12.exec("");