Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(574)

Unified Diff: src/js/string.js

Issue 2448463002: [regexp] Remove unused code (Closed)
Patch Set: Created 4 years, 2 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
« no previous file with comments | « src/js/regexp.js ('k') | src/mips/interface-descriptors-mips.cc » ('j') | no next file with comments »
Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
Index: src/js/string.js
diff --git a/src/js/string.js b/src/js/string.js
index 5d87ffce9ec9bd937b8eaad62f99f7029d34dfc4..3a9254c7130858b24ea3177a3eb5d818149fa513 100644
--- a/src/js/string.js
+++ b/src/js/string.js
@@ -10,7 +10,6 @@
// Imports
var ArrayJoin;
-var GetSubstitution;
var GlobalRegExp = global.RegExp;
var GlobalString = global.String;
var MaxSimple;
@@ -22,7 +21,6 @@ var splitSymbol = utils.ImportNow("split_symbol");
utils.Import(function(from) {
ArrayJoin = from.ArrayJoin;
- GetSubstitution = from.GetSubstitution;
MaxSimple = from.MaxSimple;
MinSimple = from.MinSimple;
});
@@ -60,6 +58,90 @@ function StringMatchJS(pattern) {
return regexp[matchSymbol](subject);
}
+// ES#sec-getsubstitution
+// GetSubstitution(matched, str, position, captures, replacement)
+// Expand the $-expressions in the string and return a new string with
+// the result.
+function GetSubstitution(matched, string, position, captures, replacement) {
+ var matchLength = matched.length;
+ var stringLength = string.length;
+ var capturesLength = captures.length;
+ var tailPos = position + matchLength;
+ var result = "";
+ var pos, expansion, peek, next, scaledIndex, advance, newScaledIndex;
+
+ var next = %StringIndexOf(replacement, '$', 0);
+ if (next < 0) {
+ result += replacement;
+ return result;
+ }
+
+ if (next > 0) result += %_SubString(replacement, 0, next);
+
+ while (true) {
+ expansion = '$';
+ pos = next + 1;
+ if (pos < replacement.length) {
+ peek = %_StringCharCodeAt(replacement, pos);
+ if (peek == 36) { // $$
+ ++pos;
+ result += '$';
+ } else if (peek == 38) { // $& - match
+ ++pos;
+ result += matched;
+ } else if (peek == 96) { // $` - prefix
+ ++pos;
+ result += %_SubString(string, 0, position);
+ } else if (peek == 39) { // $' - suffix
+ ++pos;
+ result += %_SubString(string, tailPos, stringLength);
+ } else if (peek >= 48 && peek <= 57) {
+ // Valid indices are $1 .. $9, $01 .. $09 and $10 .. $99
+ scaledIndex = (peek - 48);
+ advance = 1;
+ if (pos + 1 < replacement.length) {
+ next = %_StringCharCodeAt(replacement, pos + 1);
+ if (next >= 48 && next <= 57) {
+ newScaledIndex = scaledIndex * 10 + ((next - 48));
+ if (newScaledIndex < capturesLength) {
+ scaledIndex = newScaledIndex;
+ advance = 2;
+ }
+ }
+ }
+ if (scaledIndex != 0 && scaledIndex < capturesLength) {
+ var capture = captures.at(scaledIndex);
+ if (!IS_UNDEFINED(capture)) result += capture;
+ pos += advance;
+ } else {
+ result += '$';
+ }
+ } else {
+ result += '$';
+ }
+ } else {
+ result += '$';
+ }
+
+ // Go the the next $ in the replacement.
+ next = %StringIndexOf(replacement, '$', pos);
+
+ // Return if there are no more $ characters in the replacement. If we
+ // haven't reached the end, we need to append the suffix.
+ if (next < 0) {
+ if (pos < replacement.length) {
+ result += %_SubString(replacement, pos, replacement.length);
+ }
+ return result;
+ }
+
+ // Append substring between the previous and the next $ character.
+ if (next > pos) {
+ result += %_SubString(replacement, pos, next);
+ }
+ }
+ return result;
+}
// ES6, section 21.1.3.14
function StringReplace(search, replace) {
« no previous file with comments | « src/js/regexp.js ('k') | src/mips/interface-descriptors-mips.cc » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698