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Issue 2448463002: [regexp] Remove unused code (Closed)
Patch Set: Created 4 years, 1 month ago
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1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 (function(global, utils) {
6
7 'use strict';
8
9 %CheckIsBootstrapping();
10
11 // -------------------------------------------------------------------
12
13 // ES#sec-getsubstitution
14 // GetSubstitution(matched, str, position, captures, replacement)
15 // Expand the $-expressions in the string and return a new string with
16 // the result.
17 function GetSubstitution(matched, string, position, captures, replacement) {
18 var matchLength = matched.length;
19 var stringLength = string.length;
20 var capturesLength = captures.length;
21 var tailPos = position + matchLength;
22 var result = "";
23 var pos, expansion, peek, next, scaledIndex, advance, newScaledIndex;
24
25 var next = %StringIndexOf(replacement, '$', 0);
26 if (next < 0) {
27 result += replacement;
28 return result;
29 }
30
31 if (next > 0) result += %_SubString(replacement, 0, next);
32
33 while (true) {
34 expansion = '$';
35 pos = next + 1;
36 if (pos < replacement.length) {
37 peek = %_StringCharCodeAt(replacement, pos);
38 if (peek == 36) { // $$
39 ++pos;
40 result += '$';
41 } else if (peek == 38) { // $& - match
42 ++pos;
43 result += matched;
44 } else if (peek == 96) { // $` - prefix
45 ++pos;
46 result += %_SubString(string, 0, position);
47 } else if (peek == 39) { // $' - suffix
48 ++pos;
49 result += %_SubString(string, tailPos, stringLength);
50 } else if (peek >= 48 && peek <= 57) {
51 // Valid indices are $1 .. $9, $01 .. $09 and $10 .. $99
52 scaledIndex = (peek - 48);
53 advance = 1;
54 if (pos + 1 < replacement.length) {
55 next = %_StringCharCodeAt(replacement, pos + 1);
56 if (next >= 48 && next <= 57) {
57 newScaledIndex = scaledIndex * 10 + ((next - 48));
58 if (newScaledIndex < capturesLength) {
59 scaledIndex = newScaledIndex;
60 advance = 2;
61 }
62 }
63 }
64 if (scaledIndex != 0 && scaledIndex < capturesLength) {
65 var capture = captures.at(scaledIndex);
66 if (!IS_UNDEFINED(capture)) result += capture;
67 pos += advance;
68 } else {
69 result += '$';
70 }
71 } else {
72 result += '$';
73 }
74 } else {
75 result += '$';
76 }
77
78 // Go the the next $ in the replacement.
79 next = %StringIndexOf(replacement, '$', pos);
80
81 // Return if there are no more $ characters in the replacement. If we
82 // haven't reached the end, we need to append the suffix.
83 if (next < 0) {
84 if (pos < replacement.length) {
85 result += %_SubString(replacement, pos, replacement.length);
86 }
87 return result;
88 }
89
90 // Append substring between the previous and the next $ character.
91 if (next > pos) {
92 result += %_SubString(replacement, pos, next);
93 }
94 }
95 return result;
96 }
97
98 // -------------------------------------------------------------------
99 // Exports
100
101 utils.Export(function(to) {
102 to.GetSubstitution = GetSubstitution;
103 });
104
105 })
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