82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
'use strict';
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var esprima;
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// Browserified version does not have esprima
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//
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// 1. For node.js just require module as deps
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// 2. For browser try to require mudule via external AMD system.
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// If not found - try to fallback to window.esprima. If not
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// found too - then fail to parse.
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//
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try {
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esprima = require('esprima');
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} catch (_) {
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/*global window */
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if (typeof window !== 'undefined') { esprima = window.esprima; }
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}
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var Type = require('../../type');
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function resolveJavascriptFunction(data) {
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try {
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var source = '(' + data + ')',
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ast = esprima.parse(source, { range: true }),
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params = [],
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body;
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if ('Program' !== ast.type ||
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1 !== ast.body.length ||
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'ExpressionStatement' !== ast.body[0].type ||
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'FunctionExpression' !== ast.body[0].expression.type) {
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return false;
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}
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return true;
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} catch (err) {
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return false;
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}
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}
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function constructJavascriptFunction(data) {
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/*jslint evil:true*/
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var source = '(' + data + ')',
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ast = esprima.parse(source, { range: true }),
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params = [],
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body;
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if ('Program' !== ast.type ||
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1 !== ast.body.length ||
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'ExpressionStatement' !== ast.body[0].type ||
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'FunctionExpression' !== ast.body[0].expression.type) {
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throw new Error('Failed to resolve function');
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}
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ast.body[0].expression.params.forEach(function (param) {
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params.push(param.name);
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});
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body = ast.body[0].expression.body.range;
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// Esprima's ranges include the first '{' and the last '}' characters on
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// function expressions. So cut them out.
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return new Function(params, source.slice(body[0]+1, body[1]-1));
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}
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function representJavascriptFunction(object /*, style*/) {
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return object.toString();
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}
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function isFunction(object) {
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return '[object Function]' === Object.prototype.toString.call(object);
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}
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module.exports = new Type('tag:yaml.org,2002:js/function', {
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kind: 'scalar',
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resolve: resolveJavascriptFunction,
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construct: constructJavascriptFunction,
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predicate: isFunction,
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represent: representJavascriptFunction
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});
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