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Optimize _.escape, _.escapeRegExp, and _.unescape.

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This commit is contained in:
John-David Dalton
2014-12-09 08:55:48 -08:00
parent 091c00229a
commit eff4825000
1 changed files with 8 additions and 5 deletions
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13
lodash.js
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@@ -54,7 +54,9 @@
/** Used to match HTML entities and HTML characters. */ /** Used to match HTML entities and HTML characters. */
var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g, var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g,
reUnescapedHtml = /[&<>"'`]/g; reUnescapedHtml = /[&<>"'`]/g,
reHasEscapedHtml = RegExp(reEscapedHtml.source),
reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
/** Used to match template delimiters. */ /** Used to match template delimiters. */
var reEscape = /<%-([\s\S]+?)%>/g, var reEscape = /<%-([\s\S]+?)%>/g,
@@ -91,7 +93,8 @@
* See this [article on `RegExp` characters](http://www.regular-expressions.info/characters.html#special) * See this [article on `RegExp` characters](http://www.regular-expressions.info/characters.html#special)
* for more details. * for more details.
*/ */
var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g; var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g,
reHasRegExpChars = RegExp(reRegExpChars.source);
/** Used to detect functions containing a `this` reference. */ /** Used to detect functions containing a `this` reference. */
var reThis = /\bthis\b/; var reThis = /\bthis\b/;
@@ -8836,7 +8839,7 @@
function escape(string) { function escape(string) {
// Reset `lastIndex` because in IE < 9 `String#replace` does not. // Reset `lastIndex` because in IE < 9 `String#replace` does not.
string = string == null ? '' : String(string); string = string == null ? '' : String(string);
return string && (reUnescapedHtml.lastIndex = 0, reUnescapedHtml.test(string)) return (string && reHasUnescapedHtml.test(string))
? string.replace(reUnescapedHtml, escapeHtmlChar) ? string.replace(reUnescapedHtml, escapeHtmlChar)
: string; : string;
} }
@@ -8857,7 +8860,7 @@
*/ */
function escapeRegExp(string) { function escapeRegExp(string) {
string = string == null ? '' : String(string); string = string == null ? '' : String(string);
return string && (reRegExpChars.lastIndex = 0, reRegExpChars.test(string)) return (string && reHasRegExpChars.test(string))
? string.replace(reRegExpChars, '\\$&') ? string.replace(reRegExpChars, '\\$&')
: string; : string;
} }
@@ -9468,7 +9471,7 @@
*/ */
function unescape(string) { function unescape(string) {
string = string == null ? '' : String(string); string = string == null ? '' : String(string);
return string && (reEscapedHtml.lastIndex = 0, reEscapedHtml.test(string)) return (string && reHasEscapedHtml.test(string))
? string.replace(reEscapedHtml, unescapeHtmlChar) ? string.replace(reEscapedHtml, unescapeHtmlChar)
: string; : string;
} }