/* -*- Mode: js; js-indent-level: 2; -*- */
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/*
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* Copyright 2011 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE or:
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* http://opensource.org/licenses/BSD-3-Clause
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*/
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var util = require('./util');
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var binarySearch = require('./binary-search');
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var ArraySet = require('./array-set').ArraySet;
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var base64VLQ = require('./base64-vlq');
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var quickSort = require('./quick-sort').quickSort;
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function SourceMapConsumer(aSourceMap) {
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var sourceMap = aSourceMap;
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if (typeof aSourceMap === 'string') {
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sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
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}
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return sourceMap.sections != null
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? new IndexedSourceMapConsumer(sourceMap)
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: new BasicSourceMapConsumer(sourceMap);
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}
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SourceMapConsumer.fromSourceMap = function(aSourceMap) {
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return BasicSourceMapConsumer.fromSourceMap(aSourceMap);
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}
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/**
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* The version of the source mapping spec that we are consuming.
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*/
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SourceMapConsumer.prototype._version = 3;
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// `__generatedMappings` and `__originalMappings` are arrays that hold the
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// parsed mapping coordinates from the source map's "mappings" attribute. They
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// are lazily instantiated, accessed via the `_generatedMappings` and
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// `_originalMappings` getters respectively, and we only parse the mappings
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// and create these arrays once queried for a source location. We jump through
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// these hoops because there can be many thousands of mappings, and parsing
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// them is expensive, so we only want to do it if we must.
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//
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// Each object in the arrays is of the form:
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//
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// {
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// generatedLine: The line number in the generated code,
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// generatedColumn: The column number in the generated code,
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// source: The path to the original source file that generated this
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// chunk of code,
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// originalLine: The line number in the original source that
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// corresponds to this chunk of generated code,
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// originalColumn: The column number in the original source that
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// corresponds to this chunk of generated code,
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// name: The name of the original symbol which generated this chunk of
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// code.
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// }
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//
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// All properties except for `generatedLine` and `generatedColumn` can be
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// `null`.
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//
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// `_generatedMappings` is ordered by the generated positions.
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//
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// `_originalMappings` is ordered by the original positions.
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SourceMapConsumer.prototype.__generatedMappings = null;
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Object.defineProperty(SourceMapConsumer.prototype, '_generatedMappings', {
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get: function () {
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if (!this.__generatedMappings) {
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this._parseMappings(this._mappings, this.sourceRoot);
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}
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return this.__generatedMappings;
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}
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});
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SourceMapConsumer.prototype.__originalMappings = null;
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Object.defineProperty(SourceMapConsumer.prototype, '_originalMappings', {
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get: function () {
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if (!this.__originalMappings) {
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this._parseMappings(this._mappings, this.sourceRoot);
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}
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return this.__originalMappings;
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}
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});
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SourceMapConsumer.prototype._charIsMappingSeparator =
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function SourceMapConsumer_charIsMappingSeparator(aStr, index) {
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var c = aStr.charAt(index);
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return c === ";" || c === ",";
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};
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/**
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* Parse the mappings in a string in to a data structure which we can easily
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* query (the ordered arrays in the `this.__generatedMappings` and
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* `this.__originalMappings` properties).
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*/
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SourceMapConsumer.prototype._parseMappings =
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function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
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throw new Error("Subclasses must implement _parseMappings");
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};
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SourceMapConsumer.GENERATED_ORDER = 1;
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SourceMapConsumer.ORIGINAL_ORDER = 2;
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SourceMapConsumer.GREATEST_LOWER_BOUND = 1;
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SourceMapConsumer.LEAST_UPPER_BOUND = 2;
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/**
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* Iterate over each mapping between an original source/line/column and a
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* generated line/column in this source map.
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*
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* @param Function aCallback
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* The function that is called with each mapping.
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* @param Object aContext
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* Optional. If specified, this object will be the value of `this` every
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* time that `aCallback` is called.
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* @param aOrder
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* Either `SourceMapConsumer.GENERATED_ORDER` or
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* `SourceMapConsumer.ORIGINAL_ORDER`. Specifies whether you want to
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* iterate over the mappings sorted by the generated file's line/column
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* order or the original's source/line/column order, respectively. Defaults to
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* `SourceMapConsumer.GENERATED_ORDER`.
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*/
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SourceMapConsumer.prototype.eachMapping =
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function SourceMapConsumer_eachMapping(aCallback, aContext, aOrder) {
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var context = aContext || null;
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var order = aOrder || SourceMapConsumer.GENERATED_ORDER;
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var mappings;
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switch (order) {
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case SourceMapConsumer.GENERATED_ORDER:
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mappings = this._generatedMappings;
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break;
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case SourceMapConsumer.ORIGINAL_ORDER:
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mappings = this._originalMappings;
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break;
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default:
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throw new Error("Unknown order of iteration.");
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}
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var sourceRoot = this.sourceRoot;
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mappings.map(function (mapping) {
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var source = mapping.source === null ? null : this._sources.at(mapping.source);
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if (source != null && sourceRoot != null) {
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source = util.join(sourceRoot, source);
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}
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return {
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source: source,
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generatedLine: mapping.generatedLine,
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generatedColumn: mapping.generatedColumn,
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originalLine: mapping.originalLine,
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originalColumn: mapping.originalColumn,
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name: mapping.name === null ? null : this._names.at(mapping.name)
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};
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}, this).forEach(aCallback, context);
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};
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/**
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* Returns all generated line and column information for the original source,
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* line, and column provided. If no column is provided, returns all mappings
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* corresponding to a either the line we are searching for or the next
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* closest line that has any mappings. Otherwise, returns all mappings
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* corresponding to the given line and either the column we are searching for
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* or the next closest column that has any offsets.
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*
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* The only argument is an object with the following properties:
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*
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* - source: The filename of the original source.
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* - line: The line number in the original source.
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* - column: Optional. the column number in the original source.
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*
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* and an array of objects is returned, each with the following properties:
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*
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* - line: The line number in the generated source, or null.
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* - column: The column number in the generated source, or null.
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*/
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SourceMapConsumer.prototype.allGeneratedPositionsFor =
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function SourceMapConsumer_allGeneratedPositionsFor(aArgs) {
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var line = util.getArg(aArgs, 'line');
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// When there is no exact match, BasicSourceMapConsumer.prototype._findMapping
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// returns the index of the closest mapping less than the needle. By
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// setting needle.originalColumn to 0, we thus find the last mapping for
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// the given line, provided such a mapping exists.
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var needle = {
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source: util.getArg(aArgs, 'source'),
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originalLine: line,
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originalColumn: util.getArg(aArgs, 'column', 0)
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};
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if (this.sourceRoot != null) {
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needle.source = util.relative(this.sourceRoot, needle.source);
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}
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if (!this._sources.has(needle.source)) {
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return [];
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}
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needle.source = this._sources.indexOf(needle.source);
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var mappings = [];
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var index = this._findMapping(needle,
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this._originalMappings,
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"originalLine",
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"originalColumn",
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util.compareByOriginalPositions,
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binarySearch.LEAST_UPPER_BOUND);
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if (index >= 0) {
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var mapping = this._originalMappings[index];
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if (aArgs.column === undefined) {
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var originalLine = mapping.originalLine;
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// Iterate until either we run out of mappings, or we run into
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// a mapping for a different line than the one we found. Since
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// mappings are sorted, this is guaranteed to find all mappings for
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// the line we found.
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while (mapping && mapping.originalLine === originalLine) {
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mappings.push({
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line: util.getArg(mapping, 'generatedLine', null),
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column: util.getArg(mapping, 'generatedColumn', null),
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lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
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});
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mapping = this._originalMappings[++index];
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}
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} else {
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var originalColumn = mapping.originalColumn;
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// Iterate until either we run out of mappings, or we run into
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// a mapping for a different line than the one we were searching for.
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// Since mappings are sorted, this is guaranteed to find all mappings for
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// the line we are searching for.
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while (mapping &&
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mapping.originalLine === line &&
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mapping.originalColumn == originalColumn) {
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mappings.push({
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line: util.getArg(mapping, 'generatedLine', null),
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column: util.getArg(mapping, 'generatedColumn', null),
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lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
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});
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mapping = this._originalMappings[++index];
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}
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}
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}
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return mappings;
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};
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exports.SourceMapConsumer = SourceMapConsumer;
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/**
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* A BasicSourceMapConsumer instance represents a parsed source map which we can
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* query for information about the original file positions by giving it a file
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* position in the generated source.
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*
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* The only parameter is the raw source map (either as a JSON string, or
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* already parsed to an object). According to the spec, source maps have the
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* following attributes:
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*
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* - version: Which version of the source map spec this map is following.
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* - sources: An array of URLs to the original source files.
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* - names: An array of identifiers which can be referrenced by individual mappings.
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* - sourceRoot: Optional. The URL root from which all sources are relative.
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* - sourcesContent: Optional. An array of contents of the original source files.
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* - mappings: A string of base64 VLQs which contain the actual mappings.
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* - file: Optional. The generated file this source map is associated with.
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*
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* Here is an example source map, taken from the source map spec[0]:
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*
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* {
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* version : 3,
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* file: "out.js",
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* sourceRoot : "",
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* sources: ["foo.js", "bar.js"],
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* names: ["src", "maps", "are", "fun"],
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* mappings: "AA,AB;;ABCDE;"
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* }
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*
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* [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit?pli=1#
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*/
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function BasicSourceMapConsumer(aSourceMap) {
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var sourceMap = aSourceMap;
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if (typeof aSourceMap === 'string') {
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sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
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}
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var version = util.getArg(sourceMap, 'version');
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var sources = util.getArg(sourceMap, 'sources');
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// Sass 3.3 leaves out the 'names' array, so we deviate from the spec (which
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// requires the array) to play nice here.
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var names = util.getArg(sourceMap, 'names', []);
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var sourceRoot = util.getArg(sourceMap, 'sourceRoot', null);
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var sourcesContent = util.getArg(sourceMap, 'sourcesContent', null);
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var mappings = util.getArg(sourceMap, 'mappings');
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var file = util.getArg(sourceMap, 'file', null);
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// Once again, Sass deviates from the spec and supplies the version as a
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// string rather than a number, so we use loose equality checking here.
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if (version != this._version) {
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throw new Error('Unsupported version: ' + version);
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}
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sources = sources
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.map(String)
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// Some source maps produce relative source paths like "./foo.js" instead of
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// "foo.js". Normalize these first so that future comparisons will succeed.
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// See bugzil.la/1090768.
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.map(util.normalize)
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// Always ensure that absolute sources are internally stored relative to
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// the source root, if the source root is absolute. Not doing this would
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// be particularly problematic when the source root is a prefix of the
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// source (valid, but why??). See github issue #199 and bugzil.la/1188982.
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.map(function (source) {
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return sourceRoot && util.isAbsolute(sourceRoot) && util.isAbsolute(source)
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? util.relative(sourceRoot, source)
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: source;
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});
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// Pass `true` below to allow duplicate names and sources. While source maps
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// are intended to be compressed and deduplicated, the TypeScript compiler
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// sometimes generates source maps with duplicates in them. See Github issue
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// #72 and bugzil.la/889492.
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this._names = ArraySet.fromArray(names.map(String), true);
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this._sources = ArraySet.fromArray(sources, true);
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this.sourceRoot = sourceRoot;
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this.sourcesContent = sourcesContent;
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this._mappings = mappings;
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this.file = file;
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}
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BasicSourceMapConsumer.prototype = Object.create(SourceMapConsumer.prototype);
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BasicSourceMapConsumer.prototype.consumer = SourceMapConsumer;
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/**
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* Create a BasicSourceMapConsumer from a SourceMapGenerator.
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*
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* @param SourceMapGenerator aSourceMap
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* The source map that will be consumed.
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* @returns BasicSourceMapConsumer
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*/
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BasicSourceMapConsumer.fromSourceMap =
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function SourceMapConsumer_fromSourceMap(aSourceMap) {
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var smc = Object.create(BasicSourceMapConsumer.prototype);
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var names = smc._names = ArraySet.fromArray(aSourceMap._names.toArray(), true);
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var sources = smc._sources = ArraySet.fromArray(aSourceMap._sources.toArray(), true);
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smc.sourceRoot = aSourceMap._sourceRoot;
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smc.sourcesContent = aSourceMap._generateSourcesContent(smc._sources.toArray(),
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smc.sourceRoot);
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smc.file = aSourceMap._file;
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// Because we are modifying the entries (by converting string sources and
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// names to indices into the sources and names ArraySets), we have to make
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// a copy of the entry or else bad things happen. Shared mutable state
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// strikes again! See github issue #191.
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var generatedMappings = aSourceMap._mappings.toArray().slice();
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var destGeneratedMappings = smc.__generatedMappings = [];
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var destOriginalMappings = smc.__originalMappings = [];
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for (var i = 0, length = generatedMappings.length; i < length; i++) {
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var srcMapping = generatedMappings[i];
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var destMapping = new Mapping;
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destMapping.generatedLine = srcMapping.generatedLine;
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destMapping.generatedColumn = srcMapping.generatedColumn;
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if (srcMapping.source) {
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destMapping.source = sources.indexOf(srcMapping.source);
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destMapping.originalLine = srcMapping.originalLine;
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destMapping.originalColumn = srcMapping.originalColumn;
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if (srcMapping.name) {
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destMapping.name = names.indexOf(srcMapping.name);
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}
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destOriginalMappings.push(destMapping);
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}
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destGeneratedMappings.push(destMapping);
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}
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quickSort(smc.__originalMappings, util.compareByOriginalPositions);
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return smc;
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};
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/**
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* The version of the source mapping spec that we are consuming.
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*/
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BasicSourceMapConsumer.prototype._version = 3;
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/**
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* The list of original sources.
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*/
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Object.defineProperty(BasicSourceMapConsumer.prototype, 'sources', {
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get: function () {
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return this._sources.toArray().map(function (s) {
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return this.sourceRoot != null ? util.join(this.sourceRoot, s) : s;
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}, this);
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}
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});
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/**
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* Provide the JIT with a nice shape / hidden class.
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*/
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function Mapping() {
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this.generatedLine = 0;
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this.generatedColumn = 0;
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this.source = null;
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this.originalLine = null;
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this.originalColumn = null;
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this.name = null;
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}
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/**
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* Parse the mappings in a string in to a data structure which we can easily
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* query (the ordered arrays in the `this.__generatedMappings` and
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* `this.__originalMappings` properties).
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*/
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BasicSourceMapConsumer.prototype._parseMappings =
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function SourceMapConsumer_parseMappings(aStr, aSourceRoot) {
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var generatedLine = 1;
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var previousGeneratedColumn = 0;
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var previousOriginalLine = 0;
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var previousOriginalColumn = 0;
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var previousSource = 0;
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var previousName = 0;
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var length = aStr.length;
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var index = 0;
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var cachedSegments = {};
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var temp = {};
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var originalMappings = [];
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var generatedMappings = [];
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var mapping, str, segment, end, value;
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while (index < length) {
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if (aStr.charAt(index) === ';') {
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generatedLine++;
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index++;
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previousGeneratedColumn = 0;
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}
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else if (aStr.charAt(index) === ',') {
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index++;
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}
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else {
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mapping = new Mapping();
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mapping.generatedLine = generatedLine;
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// Because each offset is encoded relative to the previous one,
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// many segments often have the same encoding. We can exploit this
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// fact by caching the parsed variable length fields of each segment,
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// allowing us to avoid a second parse if we encounter the same
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// segment again.
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for (end = index; end < length; end++) {
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if (this._charIsMappingSeparator(aStr, end)) {
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break;
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}
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}
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str = aStr.slice(index, end);
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segment = cachedSegments[str];
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if (segment) {
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index += str.length;
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} else {
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segment = [];
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while (index < end) {
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base64VLQ.decode(aStr, index, temp);
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value = temp.value;
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index = temp.rest;
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segment.push(value);
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}
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if (segment.length === 2) {
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throw new Error('Found a source, but no line and column');
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}
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if (segment.length === 3) {
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throw new Error('Found a source and line, but no column');
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}
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cachedSegments[str] = segment;
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}
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// Generated column.
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mapping.generatedColumn = previousGeneratedColumn + segment[0];
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previousGeneratedColumn = mapping.generatedColumn;
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if (segment.length > 1) {
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// Original source.
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mapping.source = previousSource + segment[1];
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previousSource += segment[1];
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// Original line.
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mapping.originalLine = previousOriginalLine + segment[2];
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previousOriginalLine = mapping.originalLine;
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// Lines are stored 0-based
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mapping.originalLine += 1;
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// Original column.
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mapping.originalColumn = previousOriginalColumn + segment[3];
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previousOriginalColumn = mapping.originalColumn;
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if (segment.length > 4) {
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// Original name.
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mapping.name = previousName + segment[4];
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previousName += segment[4];
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}
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}
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generatedMappings.push(mapping);
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if (typeof mapping.originalLine === 'number') {
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originalMappings.push(mapping);
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}
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}
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}
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quickSort(generatedMappings, util.compareByGeneratedPositionsDeflated);
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this.__generatedMappings = generatedMappings;
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quickSort(originalMappings, util.compareByOriginalPositions);
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this.__originalMappings = originalMappings;
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};
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/**
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* Find the mapping that best matches the hypothetical "needle" mapping that
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* we are searching for in the given "haystack" of mappings.
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*/
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BasicSourceMapConsumer.prototype._findMapping =
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function SourceMapConsumer_findMapping(aNeedle, aMappings, aLineName,
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aColumnName, aComparator, aBias) {
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// To return the position we are searching for, we must first find the
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// mapping for the given position and then return the opposite position it
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// points to. Because the mappings are sorted, we can use binary search to
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// find the best mapping.
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if (aNeedle[aLineName] <= 0) {
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throw new TypeError('Line must be greater than or equal to 1, got '
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+ aNeedle[aLineName]);
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}
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if (aNeedle[aColumnName] < 0) {
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throw new TypeError('Column must be greater than or equal to 0, got '
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+ aNeedle[aColumnName]);
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}
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return binarySearch.search(aNeedle, aMappings, aComparator, aBias);
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};
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/**
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* Compute the last column for each generated mapping. The last column is
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* inclusive.
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*/
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BasicSourceMapConsumer.prototype.computeColumnSpans =
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function SourceMapConsumer_computeColumnSpans() {
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for (var index = 0; index < this._generatedMappings.length; ++index) {
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var mapping = this._generatedMappings[index];
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// Mappings do not contain a field for the last generated columnt. We
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// can come up with an optimistic estimate, however, by assuming that
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// mappings are contiguous (i.e. given two consecutive mappings, the
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// first mapping ends where the second one starts).
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if (index + 1 < this._generatedMappings.length) {
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var nextMapping = this._generatedMappings[index + 1];
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if (mapping.generatedLine === nextMapping.generatedLine) {
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mapping.lastGeneratedColumn = nextMapping.generatedColumn - 1;
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continue;
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}
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}
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// The last mapping for each line spans the entire line.
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mapping.lastGeneratedColumn = Infinity;
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}
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};
|
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/**
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* Returns the original source, line, and column information for the generated
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* source's line and column positions provided. The only argument is an object
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* with the following properties:
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*
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* - line: The line number in the generated source.
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* - column: The column number in the generated source.
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* - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
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* 'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
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* closest element that is smaller than or greater than the one we are
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* searching for, respectively, if the exact element cannot be found.
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* Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
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*
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* and an object is returned with the following properties:
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*
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* - source: The original source file, or null.
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* - line: The line number in the original source, or null.
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* - column: The column number in the original source, or null.
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* - name: The original identifier, or null.
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*/
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BasicSourceMapConsumer.prototype.originalPositionFor =
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function SourceMapConsumer_originalPositionFor(aArgs) {
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var needle = {
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generatedLine: util.getArg(aArgs, 'line'),
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generatedColumn: util.getArg(aArgs, 'column')
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};
|
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var index = this._findMapping(
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needle,
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this._generatedMappings,
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"generatedLine",
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"generatedColumn",
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util.compareByGeneratedPositionsDeflated,
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util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
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);
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if (index >= 0) {
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var mapping = this._generatedMappings[index];
|
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if (mapping.generatedLine === needle.generatedLine) {
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var source = util.getArg(mapping, 'source', null);
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if (source !== null) {
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source = this._sources.at(source);
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if (this.sourceRoot != null) {
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source = util.join(this.sourceRoot, source);
|
}
|
}
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var name = util.getArg(mapping, 'name', null);
|
if (name !== null) {
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name = this._names.at(name);
|
}
|
return {
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source: source,
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line: util.getArg(mapping, 'originalLine', null),
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column: util.getArg(mapping, 'originalColumn', null),
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name: name
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};
|
}
|
}
|
|
return {
|
source: null,
|
line: null,
|
column: null,
|
name: null
|
};
|
};
|
|
/**
|
* Return true if we have the source content for every source in the source
|
* map, false otherwise.
|
*/
|
BasicSourceMapConsumer.prototype.hasContentsOfAllSources =
|
function BasicSourceMapConsumer_hasContentsOfAllSources() {
|
if (!this.sourcesContent) {
|
return false;
|
}
|
return this.sourcesContent.length >= this._sources.size() &&
|
!this.sourcesContent.some(function (sc) { return sc == null; });
|
};
|
|
/**
|
* Returns the original source content. The only argument is the url of the
|
* original source file. Returns null if no original source content is
|
* available.
|
*/
|
BasicSourceMapConsumer.prototype.sourceContentFor =
|
function SourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
|
if (!this.sourcesContent) {
|
return null;
|
}
|
|
if (this.sourceRoot != null) {
|
aSource = util.relative(this.sourceRoot, aSource);
|
}
|
|
if (this._sources.has(aSource)) {
|
return this.sourcesContent[this._sources.indexOf(aSource)];
|
}
|
|
var url;
|
if (this.sourceRoot != null
|
&& (url = util.urlParse(this.sourceRoot))) {
|
// XXX: file:// URIs and absolute paths lead to unexpected behavior for
|
// many users. We can help them out when they expect file:// URIs to
|
// behave like it would if they were running a local HTTP server. See
|
// https://bugzilla.mozilla.org/show_bug.cgi?id=885597.
|
var fileUriAbsPath = aSource.replace(/^file:\/\//, "");
|
if (url.scheme == "file"
|
&& this._sources.has(fileUriAbsPath)) {
|
return this.sourcesContent[this._sources.indexOf(fileUriAbsPath)]
|
}
|
|
if ((!url.path || url.path == "/")
|
&& this._sources.has("/" + aSource)) {
|
return this.sourcesContent[this._sources.indexOf("/" + aSource)];
|
}
|
}
|
|
// This function is used recursively from
|
// IndexedSourceMapConsumer.prototype.sourceContentFor. In that case, we
|
// don't want to throw if we can't find the source - we just want to
|
// return null, so we provide a flag to exit gracefully.
|
if (nullOnMissing) {
|
return null;
|
}
|
else {
|
throw new Error('"' + aSource + '" is not in the SourceMap.');
|
}
|
};
|
|
/**
|
* Returns the generated line and column information for the original source,
|
* line, and column positions provided. The only argument is an object with
|
* the following properties:
|
*
|
* - source: The filename of the original source.
|
* - line: The line number in the original source.
|
* - column: The column number in the original source.
|
* - bias: Either 'SourceMapConsumer.GREATEST_LOWER_BOUND' or
|
* 'SourceMapConsumer.LEAST_UPPER_BOUND'. Specifies whether to return the
|
* closest element that is smaller than or greater than the one we are
|
* searching for, respectively, if the exact element cannot be found.
|
* Defaults to 'SourceMapConsumer.GREATEST_LOWER_BOUND'.
|
*
|
* and an object is returned with the following properties:
|
*
|
* - line: The line number in the generated source, or null.
|
* - column: The column number in the generated source, or null.
|
*/
|
BasicSourceMapConsumer.prototype.generatedPositionFor =
|
function SourceMapConsumer_generatedPositionFor(aArgs) {
|
var source = util.getArg(aArgs, 'source');
|
if (this.sourceRoot != null) {
|
source = util.relative(this.sourceRoot, source);
|
}
|
if (!this._sources.has(source)) {
|
return {
|
line: null,
|
column: null,
|
lastColumn: null
|
};
|
}
|
source = this._sources.indexOf(source);
|
|
var needle = {
|
source: source,
|
originalLine: util.getArg(aArgs, 'line'),
|
originalColumn: util.getArg(aArgs, 'column')
|
};
|
|
var index = this._findMapping(
|
needle,
|
this._originalMappings,
|
"originalLine",
|
"originalColumn",
|
util.compareByOriginalPositions,
|
util.getArg(aArgs, 'bias', SourceMapConsumer.GREATEST_LOWER_BOUND)
|
);
|
|
if (index >= 0) {
|
var mapping = this._originalMappings[index];
|
|
if (mapping.source === needle.source) {
|
return {
|
line: util.getArg(mapping, 'generatedLine', null),
|
column: util.getArg(mapping, 'generatedColumn', null),
|
lastColumn: util.getArg(mapping, 'lastGeneratedColumn', null)
|
};
|
}
|
}
|
|
return {
|
line: null,
|
column: null,
|
lastColumn: null
|
};
|
};
|
|
exports.BasicSourceMapConsumer = BasicSourceMapConsumer;
|
|
/**
|
* An IndexedSourceMapConsumer instance represents a parsed source map which
|
* we can query for information. It differs from BasicSourceMapConsumer in
|
* that it takes "indexed" source maps (i.e. ones with a "sections" field) as
|
* input.
|
*
|
* The only parameter is a raw source map (either as a JSON string, or already
|
* parsed to an object). According to the spec for indexed source maps, they
|
* have the following attributes:
|
*
|
* - version: Which version of the source map spec this map is following.
|
* - file: Optional. The generated file this source map is associated with.
|
* - sections: A list of section definitions.
|
*
|
* Each value under the "sections" field has two fields:
|
* - offset: The offset into the original specified at which this section
|
* begins to apply, defined as an object with a "line" and "column"
|
* field.
|
* - map: A source map definition. This source map could also be indexed,
|
* but doesn't have to be.
|
*
|
* Instead of the "map" field, it's also possible to have a "url" field
|
* specifying a URL to retrieve a source map from, but that's currently
|
* unsupported.
|
*
|
* Here's an example source map, taken from the source map spec[0], but
|
* modified to omit a section which uses the "url" field.
|
*
|
* {
|
* version : 3,
|
* file: "app.js",
|
* sections: [{
|
* offset: {line:100, column:10},
|
* map: {
|
* version : 3,
|
* file: "section.js",
|
* sources: ["foo.js", "bar.js"],
|
* names: ["src", "maps", "are", "fun"],
|
* mappings: "AAAA,E;;ABCDE;"
|
* }
|
* }],
|
* }
|
*
|
* [0]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit#heading=h.535es3xeprgt
|
*/
|
function IndexedSourceMapConsumer(aSourceMap) {
|
var sourceMap = aSourceMap;
|
if (typeof aSourceMap === 'string') {
|
sourceMap = JSON.parse(aSourceMap.replace(/^\)\]\}'/, ''));
|
}
|
|
var version = util.getArg(sourceMap, 'version');
|
var sections = util.getArg(sourceMap, 'sections');
|
|
if (version != this._version) {
|
throw new Error('Unsupported version: ' + version);
|
}
|
|
this._sources = new ArraySet();
|
this._names = new ArraySet();
|
|
var lastOffset = {
|
line: -1,
|
column: 0
|
};
|
this._sections = sections.map(function (s) {
|
if (s.url) {
|
// The url field will require support for asynchronicity.
|
// See https://github.com/mozilla/source-map/issues/16
|
throw new Error('Support for url field in sections not implemented.');
|
}
|
var offset = util.getArg(s, 'offset');
|
var offsetLine = util.getArg(offset, 'line');
|
var offsetColumn = util.getArg(offset, 'column');
|
|
if (offsetLine < lastOffset.line ||
|
(offsetLine === lastOffset.line && offsetColumn < lastOffset.column)) {
|
throw new Error('Section offsets must be ordered and non-overlapping.');
|
}
|
lastOffset = offset;
|
|
return {
|
generatedOffset: {
|
// The offset fields are 0-based, but we use 1-based indices when
|
// encoding/decoding from VLQ.
|
generatedLine: offsetLine + 1,
|
generatedColumn: offsetColumn + 1
|
},
|
consumer: new SourceMapConsumer(util.getArg(s, 'map'))
|
}
|
});
|
}
|
|
IndexedSourceMapConsumer.prototype = Object.create(SourceMapConsumer.prototype);
|
IndexedSourceMapConsumer.prototype.constructor = SourceMapConsumer;
|
|
/**
|
* The version of the source mapping spec that we are consuming.
|
*/
|
IndexedSourceMapConsumer.prototype._version = 3;
|
|
/**
|
* The list of original sources.
|
*/
|
Object.defineProperty(IndexedSourceMapConsumer.prototype, 'sources', {
|
get: function () {
|
var sources = [];
|
for (var i = 0; i < this._sections.length; i++) {
|
for (var j = 0; j < this._sections[i].consumer.sources.length; j++) {
|
sources.push(this._sections[i].consumer.sources[j]);
|
}
|
}
|
return sources;
|
}
|
});
|
|
/**
|
* Returns the original source, line, and column information for the generated
|
* source's line and column positions provided. The only argument is an object
|
* with the following properties:
|
*
|
* - line: The line number in the generated source.
|
* - column: The column number in the generated source.
|
*
|
* and an object is returned with the following properties:
|
*
|
* - source: The original source file, or null.
|
* - line: The line number in the original source, or null.
|
* - column: The column number in the original source, or null.
|
* - name: The original identifier, or null.
|
*/
|
IndexedSourceMapConsumer.prototype.originalPositionFor =
|
function IndexedSourceMapConsumer_originalPositionFor(aArgs) {
|
var needle = {
|
generatedLine: util.getArg(aArgs, 'line'),
|
generatedColumn: util.getArg(aArgs, 'column')
|
};
|
|
// Find the section containing the generated position we're trying to map
|
// to an original position.
|
var sectionIndex = binarySearch.search(needle, this._sections,
|
function(needle, section) {
|
var cmp = needle.generatedLine - section.generatedOffset.generatedLine;
|
if (cmp) {
|
return cmp;
|
}
|
|
return (needle.generatedColumn -
|
section.generatedOffset.generatedColumn);
|
});
|
var section = this._sections[sectionIndex];
|
|
if (!section) {
|
return {
|
source: null,
|
line: null,
|
column: null,
|
name: null
|
};
|
}
|
|
return section.consumer.originalPositionFor({
|
line: needle.generatedLine -
|
(section.generatedOffset.generatedLine - 1),
|
column: needle.generatedColumn -
|
(section.generatedOffset.generatedLine === needle.generatedLine
|
? section.generatedOffset.generatedColumn - 1
|
: 0),
|
bias: aArgs.bias
|
});
|
};
|
|
/**
|
* Return true if we have the source content for every source in the source
|
* map, false otherwise.
|
*/
|
IndexedSourceMapConsumer.prototype.hasContentsOfAllSources =
|
function IndexedSourceMapConsumer_hasContentsOfAllSources() {
|
return this._sections.every(function (s) {
|
return s.consumer.hasContentsOfAllSources();
|
});
|
};
|
|
/**
|
* Returns the original source content. The only argument is the url of the
|
* original source file. Returns null if no original source content is
|
* available.
|
*/
|
IndexedSourceMapConsumer.prototype.sourceContentFor =
|
function IndexedSourceMapConsumer_sourceContentFor(aSource, nullOnMissing) {
|
for (var i = 0; i < this._sections.length; i++) {
|
var section = this._sections[i];
|
|
var content = section.consumer.sourceContentFor(aSource, true);
|
if (content) {
|
return content;
|
}
|
}
|
if (nullOnMissing) {
|
return null;
|
}
|
else {
|
throw new Error('"' + aSource + '" is not in the SourceMap.');
|
}
|
};
|
|
/**
|
* Returns the generated line and column information for the original source,
|
* line, and column positions provided. The only argument is an object with
|
* the following properties:
|
*
|
* - source: The filename of the original source.
|
* - line: The line number in the original source.
|
* - column: The column number in the original source.
|
*
|
* and an object is returned with the following properties:
|
*
|
* - line: The line number in the generated source, or null.
|
* - column: The column number in the generated source, or null.
|
*/
|
IndexedSourceMapConsumer.prototype.generatedPositionFor =
|
function IndexedSourceMapConsumer_generatedPositionFor(aArgs) {
|
for (var i = 0; i < this._sections.length; i++) {
|
var section = this._sections[i];
|
|
// Only consider this section if the requested source is in the list of
|
// sources of the consumer.
|
if (section.consumer.sources.indexOf(util.getArg(aArgs, 'source')) === -1) {
|
continue;
|
}
|
var generatedPosition = section.consumer.generatedPositionFor(aArgs);
|
if (generatedPosition) {
|
var ret = {
|
line: generatedPosition.line +
|
(section.generatedOffset.generatedLine - 1),
|
column: generatedPosition.column +
|
(section.generatedOffset.generatedLine === generatedPosition.line
|
? section.generatedOffset.generatedColumn - 1
|
: 0)
|
};
|
return ret;
|
}
|
}
|
|
return {
|
line: null,
|
column: null
|
};
|
};
|
|
/**
|
* Parse the mappings in a string in to a data structure which we can easily
|
* query (the ordered arrays in the `this.__generatedMappings` and
|
* `this.__originalMappings` properties).
|
*/
|
IndexedSourceMapConsumer.prototype._parseMappings =
|
function IndexedSourceMapConsumer_parseMappings(aStr, aSourceRoot) {
|
this.__generatedMappings = [];
|
this.__originalMappings = [];
|
for (var i = 0; i < this._sections.length; i++) {
|
var section = this._sections[i];
|
var sectionMappings = section.consumer._generatedMappings;
|
for (var j = 0; j < sectionMappings.length; j++) {
|
var mapping = sectionMappings[j];
|
|
var source = section.consumer._sources.at(mapping.source);
|
if (section.consumer.sourceRoot !== null) {
|
source = util.join(section.consumer.sourceRoot, source);
|
}
|
this._sources.add(source);
|
source = this._sources.indexOf(source);
|
|
var name = section.consumer._names.at(mapping.name);
|
this._names.add(name);
|
name = this._names.indexOf(name);
|
|
// The mappings coming from the consumer for the section have
|
// generated positions relative to the start of the section, so we
|
// need to offset them to be relative to the start of the concatenated
|
// generated file.
|
var adjustedMapping = {
|
source: source,
|
generatedLine: mapping.generatedLine +
|
(section.generatedOffset.generatedLine - 1),
|
generatedColumn: mapping.generatedColumn +
|
(section.generatedOffset.generatedLine === mapping.generatedLine
|
? section.generatedOffset.generatedColumn - 1
|
: 0),
|
originalLine: mapping.originalLine,
|
originalColumn: mapping.originalColumn,
|
name: name
|
};
|
|
this.__generatedMappings.push(adjustedMapping);
|
if (typeof adjustedMapping.originalLine === 'number') {
|
this.__originalMappings.push(adjustedMapping);
|
}
|
}
|
}
|
|
quickSort(this.__generatedMappings, util.compareByGeneratedPositionsDeflated);
|
quickSort(this.__originalMappings, util.compareByOriginalPositions);
|
};
|
|
exports.IndexedSourceMapConsumer = IndexedSourceMapConsumer;
|
