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Clean up _.template.

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* Cache regexes.
* Use object properties for lookup instead of switch.
This commit is contained in:
Brad Dunbar
2012-03-14 08:25:01 -04:00
parent ba3e31b53e
commit f5eb4b0915
1 changed files with 32 additions and 27 deletions
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59
underscore.js
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@@ -902,19 +902,27 @@
// guaranteed not to match.
var noMatch = /.^/;
// Certain characters need to be escaped so that they can be put into a
// string literal.
var escapes = {
'\\': '\\',
"'": "'",
'r': '\r',
'n': '\n',
't': '\t',
'u2028': '\u2028',
'u2029': '\u2029'
};
for (var p in escapes) escapes[escapes[p]] = p;
var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;
var unescaper = /\\(\\|'|r|n|t|u2028|u2029)/g;
// Within an interpolation, evaluation, or escaping, remove HTML escaping
// that had been previously added.
var unescape = function(code) {
return code.replace(/\\(\\|'|r|n|t|u2028|u2029)/g, function(match, char) {
switch (char) {
case '\\': return '\\';
case "'": return "'";
case 'r': return '\r';
case 'n': return '\n';
case 't': return '\t';
case 'u2028': return '\u2028';
case 'u2029': return '\u2029';
}
return code.replace(unescaper, function(match, escape) {
return escapes[escape];
});
};
@@ -925,23 +933,20 @@
var c = _.templateSettings;
var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +
'with(obj||{}){__p.push(\'' +
str.replace(/\\/g, '\\\\')
.replace(/'/g, "\\'")
.replace(/\r/g, '\\r')
.replace(/\n/g, '\\n')
.replace(/\t/g, '\\t')
.replace(/\u2028/g, '\\u2028')
.replace(/\u2029/g, '\\u2029')
.replace(c.escape || noMatch, function(match, code) {
return "',_.escape(" + unescape(code) + "),\n'";
})
.replace(c.interpolate || noMatch, function(match, code) {
return "'," + unescape(code) + ",\n'";
})
.replace(c.evaluate || noMatch, function(match, code) {
return "');" + unescape(code) + ";\n__p.push('";
})
+ "');}return __p.join('');";
str
.replace(escaper, function(match) {
return '\\' + escapes[match];
})
.replace(c.escape || noMatch, function(match, code) {
return "',_.escape(" + unescape(code) + "),\n'";
})
.replace(c.interpolate || noMatch, function(match, code) {
return "'," + unescape(code) + ",\n'";
})
.replace(c.evaluate || noMatch, function(match, code) {
return "');" + unescape(code) + ";\n__p.push('";
})
+ "');}return __p.join('');";
var func = new Function('obj', '_', tmpl);
if (data) return func(data, _);
return function(data) {