45 lines
1.8 KiB
TypeScript
45 lines
1.8 KiB
TypeScript
import {Promise, PromiseWrapper} from 'angular2/src/core/facade/async';
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import {isPresent, global, StringWrapper} from 'angular2/src/core/facade/lang';
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var evalCounter = 0;
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var MODULE_URL_REGEX = /^package:(.*)\.js/;
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function nextModuleId() {
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return `evalScript${evalCounter++}`;
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}
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export function evalModule(moduleSource: string, imports: string[][], args: any[]): Promise<any> {
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var moduleId = nextModuleId();
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var moduleSourceWithImports = [];
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var importModuleIds = [];
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imports.forEach(sourceImport => {
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var modUrl = sourceImport[0];
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var modMatch = MODULE_URL_REGEX.exec(modUrl);
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if (!modMatch) {
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throw new Error(`Module url ${modUrl} does not match the pattern ${MODULE_URL_REGEX}`);
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}
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var modId = modMatch[1];
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var modAlias = sourceImport[1];
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importModuleIds.push(modId);
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// Note: After transpilation to commonJS and loading this file in a browser
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// using SystemJS, the loader might get confused by the presence of require,
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// and attempt to load "+ modName +.js" !?!
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// A simple string concat manages to prevent that, but that is one compiler
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// optimaztion away from breaking again. Proceed with caution!
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moduleSourceWithImports.push(`var ${modAlias} = require` + `('${modId}');`);
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});
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moduleSourceWithImports.push(moduleSource);
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var moduleBody = new Function('require', 'exports', 'module', moduleSourceWithImports.join('\n'));
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var System = global['System'];
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if (isPresent(System) && isPresent(System.registerDynamic)) {
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System.registerDynamic(moduleId, importModuleIds, false, moduleBody);
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return <Promise<any>>System.import(moduleId).then((module) => module.run(args));
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} else {
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var exports = {};
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moduleBody(require, exports, {});
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return PromiseWrapper.resolve(exports['run'](args));
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}
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}
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