38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {SourceMap} from '@angular/compiler/src/output/source_map';
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const b64 = require('base64-js');
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const SourceMapConsumer = require('source-map').SourceMapConsumer;
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export interface SourceLocation {
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line: number;
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column: number;
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source: string;
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}
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export function originalPositionFor(
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sourceMap: SourceMap, genPosition: {line: number, column: number}): SourceLocation {
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const smc = new SourceMapConsumer(sourceMap);
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// Note: We don't return the original object as it also contains a `name` property
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// which is always null and we don't want to include that in our assertions...
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const {line, column, source} = smc.originalPositionFor(genPosition);
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return {line, column, source};
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}
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export function extractSourceMap(source: string): SourceMap {
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let idx = source.lastIndexOf('\n//#');
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if (idx == -1) return null;
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const smComment = source.slice(idx).trim();
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const smB64 = smComment.split('sourceMappingURL=data:application/json;base64,')[1];
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return smB64 ? JSON.parse(decodeB64String(smB64)) : null;
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}
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function decodeB64String(s: string): string {
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return b64.toByteArray(s).reduce((s: string, c: number) => s + String.fromCharCode(c), '');
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}
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