work.suroh.tk/node_modules/is-expression/index.js

46 lines
840 B
JavaScript

'use strict';
var acorn = require('acorn');
var objectAssign = require('object-assign');
module.exports = isExpression;
var DEFAULT_OPTIONS = {
throw: false,
strict: false,
lineComment: false
};
function isExpression(src, options) {
options = objectAssign({}, DEFAULT_OPTIONS, options);
try {
var parser = new acorn.Parser(options, src, 0);
if (options.strict) {
parser.strict = true;
}
if (!options.lineComment) {
parser.skipLineComment = function (startSkip) {
this.raise(this.pos, 'Line comments not allowed in an expression');
};
}
parser.nextToken();
parser.parseExpression();
if (parser.type !== acorn.tokTypes.eof) {
parser.unexpected();
}
} catch (ex) {
if (!options.throw) {
return false;
}
throw ex;
}
return true;
}