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);


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

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