test/mjsunit/string-match.js

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/**
 * @fileoverview Test String.prototype.match
 */


function testMatch(name, input, regexp, result, captures, from, to) {
  var matchResult = input.match(regexp);
  assertEquals(result, matchResult, name + "-match");

  var match = input.substring(from, to);
  var preMatch = input.substring(0, from);
  var postMatch = input.substring(to);
  var lastParen = captures.length > 0 ? captures[captures.length - 1] : "";

  if (regexp.global) {
    // Returns array of matched strings.
    var lastMatch = matchResult[matchResult.length - 1];
    assertEquals(match, lastMatch, name + "-match-string_g");
  } else {
    // Returns array of match and captures.
    assertEquals(match, matchResult[0], name + "-match-string");
    assertEquals(captures.length + 1, matchResult.length, name + "-cap-return");
    for (var i = 1; i < matchResult.length; i++) {
      assertEquals(captures[i - 1], matchResult[i], name + "-cap-return-" + i);
    }
  }

  assertEquals(match, RegExp["$&"], name + "-$&");
  assertEquals(match, RegExp.lastMatch, name + "-lastMatch");

  assertEquals(undefined, RegExp.$0, name + "-nocapture-10");
  for (var i = 1; i <= 9; i++) {
    if (i <= captures.length) {
      assertEquals(captures[i - 1], RegExp["$" + i], name + "-capture-" + i);
    } else {
      assertEquals("", RegExp["$" + i], name + "-nocapture-" + i);
    }
  }
  assertEquals(undefined, RegExp.$10, name + "-nocapture-10");

  assertEquals(input, RegExp.input, name + "-input");
  assertEquals(input, RegExp.$input, name + "-$input");
  assertEquals(input, RegExp.$_, name + "-$_");

  assertEquals(preMatch, RegExp["$`"], name + "-$`");
  assertEquals(preMatch, RegExp.leftContext, name + "-leftContex");

  assertEquals(postMatch, RegExp["$'"], name + "-$'");
  assertEquals(postMatch, RegExp.rightContext, name + "-rightContex");

  assertEquals(lastParen, RegExp["$+"], name + "-$+");
  assertEquals(lastParen, RegExp.lastParen, name + "-lastParen");

}


var stringSample = "A man, a plan, a canal: Panama";
var stringSample2 = "Argle bargle glop glyf!";
var stringSample3 = "abcdefghijxxxxxxxxxx";


// Non-capturing, non-global regexp.

var re_nog = /\w+/;

testMatch("Nonglobal", stringSample, re_nog,
          ["A"],
          [], 0, 1);


re_nog.lastIndex = 2;

testMatch("Nonglobal-ignore-lastIndex", stringSample, re_nog,
          ["A"],
          [], 0, 1);


// Capturing non-global regexp.

var re_multicap = /(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)/;
testMatch("Capture-Nonglobal", stringSample3, re_multicap,
          ["abcdefghij", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j"],
          ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"], 0, 10);


// Global regexp (also check that capture from before are cleared)

var re = /\w+/g;
testMatch("Global", stringSample2, re,
          ["Argle", "bargle", "glop", "glyf"], [], 18, 22);

re.lastIndex = 10;

testMatch("Global-ignore-lastIndex", stringSample2, re,
          ["Argle", "bargle", "glop", "glyf"], [], 18, 22);


// Capturing global regexp

var re_cap = /\w(\w*)/g;

testMatch("Capture-Global", stringSample, re_cap,
          ["A", "man", "a", "plan", "a", "canal", "Panama"],
          ["anama"], 24, 30);


// Atom, non-global

var re_atom = /an/;

testMatch("Atom", stringSample, re_atom,
          ["an"],
          [], 3, 5);


// Atom, global

var re_atomg = /an/g;

testMatch("Global-Atom", stringSample, re_atomg,
          ["an", "an", "an", "an"],
          [], 25, 27);