64 lines
2.3 KiB
JavaScript
64 lines
2.3 KiB
JavaScript
var fs = require('fs');
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// require('...') || exports[''] = ... || exports.asd = ... || module.exports = ...
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var cjsExportsRegEx = /(?:^\uFEFF?|[^$_a-zA-Z\xA0-\uFFFF.])(exports\s*(\[['"]|\.)|module(\.exports|\['exports'\]|\["exports"\])\s*(\[['"]|[=,\.]))/;
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// RegEx adjusted from https://github.com/jbrantly/yabble/blob/master/lib/yabble.js#L339
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var cjsRequireRegEx = /(?:^\uFEFF?|[^$_a-zA-Z\xA0-\uFFFF."'])require\s*\(\s*("[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')\s*\)/g;
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var commentRegEx = /(^|[^\\])(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg;
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var stringRegEx = /("[^"\\\n\r]*(\\.[^"\\\n\r]*)*"|'[^'\\\n\r]*(\\.[^'\\\n\r]*)*')/g;
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function getCJSDeps(source) {
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cjsRequireRegEx.lastIndex = commentRegEx.lastIndex = stringRegEx.lastIndex = 0;
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var deps = [];
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var match;
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// track string and comment locations for unminified source
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var stringLocations = [], commentLocations = [];
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function inLocation(locations, match) {
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for (var i = 0; i < locations.length; i++)
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if (locations[i][0] < match.index && locations[i][1] > match.index)
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return true;
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return false;
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}
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if (source.length / source.split('\n').length < 200) {
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while (match = stringRegEx.exec(source))
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stringLocations.push([match.index, match.index + match[0].length]);
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// TODO: track template literals here before comments
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while (match = commentRegEx.exec(source)) {
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// only track comments not starting in strings
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if (!inLocation(stringLocations, match))
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commentLocations.push([match.index + match[1].length, match.index + match[0].length - 1]);
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}
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}
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while (match = cjsRequireRegEx.exec(source)) {
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// ensure we're not within a string or comment location
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if (!inLocation(stringLocations, match) && !inLocation(commentLocations, match)) {
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var dep = match[1].substr(1, match[1].length - 2);
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// skip cases like require('" + file + "')
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if (dep.match(/"|'/))
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continue;
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// trailing slash requires are removed as they don't map mains in SystemJS
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if (dep[dep.length - 1] == '/')
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dep = dep.substr(0, dep.length - 1);
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deps.push(dep);
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}
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}
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return deps;
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}
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var cjs = fs.readFileSync('./cjs-sample/cjs.js').toString();
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var startTime = Date.now();
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for (var i = 0; i < 1000; i++)
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getCJSDeps(cjs);
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console.log(Date.now() - startTime);
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