back-references.js (2285B)
1 // Copyright (C) 2017 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-assertion 6 description: Back references 7 info: | 8 The production Assertion :: (?<=Disjunction) evaluates as follows: 9 1. Evaluate Disjunction with -1 as its direction argument to obtain a Matcher m. 10 2. Return an internal Matcher closure that takes two arguments, a State x and a Continuation 11 c, and performs the following steps: 12 a. Let d be a Continuation that always returns its State argument as a successful MatchResult. 13 b. Call m(x, d) and let r be its result. 14 c. If r is failure, return failure. 15 d. Let y be r's State. 16 e. Let cap be y's captures List. 17 f. Let xe be x's endIndex. 18 g. Let z be the State (xe, cap). 19 h. Call c(z) and return its result. 20 features: [regexp-lookbehind] 21 includes: [compareArray.js] 22 ---*/ 23 24 assert.compareArray("abb".match(/(.)(?<=(\1\1))/), ["b", "b", "bb"], "#1"); 25 assert.compareArray("abB".match(/(.)(?<=(\1\1))/i), ["B", "B", "bB"], "#2"); 26 assert.compareArray("aabAaBa".match(/((\w)\w)(?<=\1\2\1)/i), ["aB", "aB", "a"], "#3"); 27 assert.compareArray("aabAaBa".match(/(\w(\w))(?<=\1\2\1)/i), ["Ba", "Ba", "a"], "#4"); 28 assert.compareArray("abaBbAa".match(/(?=(\w))(?<=(\1))./i), ["b", "b", "B"], "#5"); 29 assert.compareArray(" 'foo' ".match(/(?<=(.))(\w+)(?=\1)/), ["foo", "'", "foo"], "#6"); 30 assert.compareArray(" \"foo\" ".match(/(?<=(.))(\w+)(?=\1)/), ["foo", "\"", "foo"], "#7"); 31 assert.compareArray("abbb".match(/(.)(?<=\1\1\1)/), ["b", "b"], "#8"); 32 assert.compareArray("fababab".match(/(..)(?<=\1\1\1)/), ["ab", "ab"], "#9"); 33 34 assert.sameValue(" .foo\" ".match(/(?<=(.))(\w+)(?=\1)/), null, "#10"); 35 assert.sameValue("ab".match(/(.)(?<=\1\1\1)/), null, "#11"); 36 assert.sameValue("abb".match(/(.)(?<=\1\1\1)/), null, "#12"); 37 assert.sameValue("ab".match(/(..)(?<=\1\1\1)/), null, "#13"); 38 assert.sameValue("abb".match(/(..)(?<=\1\1\1)/), null, "#14"); 39 assert.sameValue("aabb".match(/(..)(?<=\1\1\1)/), null, "#15"); 40 assert.sameValue("abab".match(/(..)(?<=\1\1\1)/), null, "#16"); 41 assert.sameValue("fabxbab".match(/(..)(?<=\1\1\1)/), null, "#17"); 42 assert.sameValue("faxabab".match(/(..)(?<=\1\1\1)/), null, "#18"); 43 44 45 reportCompare(0, 0);