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performance improvement of single statement in parser

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Misko Hevery
2011-03-23 09:30:08 -07:00
parent cc9f1fdf38
commit 20ce797906
1 changed files with 13 additions and 9 deletions
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22
src/parser.js
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@@ -325,15 +325,19 @@ function parser(text, json){
if (tokens.length > 0 && !peek('}', ')', ';', ']'))
statements.push(filterChain());
if (!expect(';')) {
return function (self){
var value;
for ( var i = 0; i < statements.length; i++) {
var statement = statements[i];
if (statement)
value = statement(self);
}
return value;
};
// optimize for the common case where there is only one statement.
// TODO(size): maybe we should not support multiple statements?
return statements.length == 1
? statements[0]
: function (self){
var value;
for ( var i = 0; i < statements.length; i++) {
var statement = statements[i];
if (statement)
value = statement(self);
}
return value;
};
}
}
}