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88 lines
2.3 KiB
88 lines
2.3 KiB
3 years ago
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'use strict';
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const {
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VMError
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} = require('./bridge');
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let cacheCoffeeScriptCompiler;
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/**
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* Returns the cached coffee script compiler or loads it
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* if it is not found in the cache.
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*
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* @private
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* @return {compileCallback} The coffee script compiler.
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* @throws {VMError} If the coffee-script module can't be found.
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*/
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function getCoffeeScriptCompiler() {
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if (!cacheCoffeeScriptCompiler) {
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try {
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// The warning generated by webpack can be disabled by setting:
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// ignoreWarnings[].message = /Can't resolve 'coffee-script'/
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/* eslint-disable-next-line global-require */
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const coffeeScript = require('coffee-script');
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cacheCoffeeScriptCompiler = (code, filename) => {
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return coffeeScript.compile(code, {header: false, bare: true});
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};
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} catch (e) {
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throw new VMError('Coffee-Script compiler is not installed.');
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}
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}
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return cacheCoffeeScriptCompiler;
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}
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/**
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* Remove the shebang from source code.
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*
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* @private
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* @param {string} code - Code from which to remove the shebang.
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* @return {string} code without the shebang.
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*/
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function removeShebang(code) {
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if (!code.startsWith('#!')) return code;
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return '//' + code.substring(2);
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}
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/**
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* The JavaScript compiler, just a identity function.
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*
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* @private
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* @type {compileCallback}
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* @param {string} code - The JavaScript code.
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* @param {string} filename - Filename of this script.
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* @return {string} The code.
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*/
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function jsCompiler(code, filename) {
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return removeShebang(code);
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}
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/**
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* Look up the compiler for a specific name.
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*
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* @private
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* @param {(string|compileCallback)} compiler - A compile callback or the name of the compiler.
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* @return {compileCallback} The resolved compiler.
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* @throws {VMError} If the compiler is unknown or the coffee script module was needed and couldn't be found.
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*/
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function lookupCompiler(compiler) {
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if ('function' === typeof compiler) return compiler;
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switch (compiler) {
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case 'coffeescript':
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case 'coffee-script':
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case 'cs':
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case 'text/coffeescript':
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return getCoffeeScriptCompiler();
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case 'javascript':
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case 'java-script':
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case 'js':
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case 'text/javascript':
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return jsCompiler;
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default:
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throw new VMError(`Unsupported compiler '${compiler}'.`);
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}
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}
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exports.removeShebang = removeShebang;
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exports.lookupCompiler = lookupCompiler;
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