detectStrictMode.jsā¢782 B
var multiLineComment = /^\s*\/\*.*?\*\//;
var singleLineComment = /^\s*\/\/.*?[\r\n]/;
var strictMode = /^\s*(?:"use strict"|'use strict')[ \t]*(?:[\r\n]|;)/;
/**
* Returns true if the source code is intended to run in strict mode. Does not detect
* "use strict" if it occurs in a nested function.
*
* @param {String} src
* @return {Boolean}
*/
function detectStrictMode(src) {
var singleLine;
var multiLine;
while ((singleLine = singleLineComment.test(src)) || (multiLine = multiLineComment.test(src))) {
if (singleLine) {
src = src.replace(singleLineComment, "");
}
if (multiLine) {
src = src.replace(multiLineComment, "");
}
}
return strictMode.test(src);
}
module.exports = detectStrictMode;