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84 lines
1.7 KiB
JavaScript
84 lines
1.7 KiB
JavaScript
5 years ago
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'use strict';
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module.exports.parse = parse;
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module.exports.generate = generate;
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// TODO(jamestalmage): Allow full range of identifier characters instead of just ASCII
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//
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// This will likely require a build step
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//
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// SPEC: http://www.ecma-international.org/ecma-262/5.1/#sec-7.6
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//
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// TOOLING:
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// https://github.com/mathiasbynens/regenerate
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// https://www.npmjs.com/package/regjsgen
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var regex = /^\s*(?:([A-Za-z$_][A-Za-z0-9$_]*)\s*\.)?\s*([A-Za-z$_][A-Za-z0-9$_]*)\s*\(\s*((?:[A-Za-z$_][A-Za-z0-9$_]*)|(?:\[\s*[A-Za-z$_][A-Za-z0-9$_]*\s*]))?((?:\s*,\s*(?:(?:[A-Za-z$_][A-Za-z0-9$_]*)|(?:\[\s*[A-Za-z$_][A-Za-z0-9$_]*\s*])))+)?\s*\)\s*$/;
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function parse(str) {
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var match = regex.exec(str);
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if (!match) {
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return null;
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}
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var callee;
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if (match[1]) {
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callee = {
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type: 'MemberExpression',
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object: match[1],
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member: match[2]
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};
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} else {
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callee = {
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type: 'Identifier',
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name: match[2]
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};
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}
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var args = match[4] || '';
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args = args.split(',');
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if (match[3]) {
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args[0] = match[3];
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}
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var trimmed = [];
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args.forEach(function (str) {
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var optional = false;
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str = str.replace(/\s+/g, '');
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if (!str.length) {
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return;
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}
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if (str.charAt(0) === '[' && str.charAt(str.length - 1) === ']') {
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optional = true;
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str = str.substring(1, str.length - 1);
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}
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trimmed.push({
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name: str,
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optional: optional
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});
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});
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return {
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callee: callee,
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args: trimmed
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};
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}
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function generate(parsed) {
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var callee;
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if (parsed.callee.type === 'MemberExpression') {
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callee = [
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parsed.callee.object,
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'.',
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parsed.callee.member
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];
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} else {
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callee = [parsed.callee.name];
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}
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return callee.concat([
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'(',
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parsed.args.map(function (arg) {
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return arg.optional ? '[' + arg.name + ']' : arg.name;
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}).join(', '),
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')'
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]).join('');
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}
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