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/* -*- Mode: js; js-indent-level: 2; -*- */
/*
* Copyright 2011 Mozilla Foundation and contributors
* Licensed under the New BSD license. See LICENSE or:
* http://opensource.org/licenses/BSD-3-Clause
*/
const base64VLQ = require("./base64-vlq");
const util = require("./util");
const ArraySet = require("./array-set").ArraySet;
const MappingList = require("./mapping-list").MappingList;
/**
* An instance of the SourceMapGenerator represents a source map which is
* being built incrementally. You may pass an object with the following
* properties:
*
* - file: The filename of the generated source.
* - sourceRoot: A root for all relative URLs in this source map.
*/
class SourceMapGenerator {
constructor(aArgs) {
if (!aArgs) {
aArgs = {};
}
this._file = util.getArg(aArgs, "file", null);
this._sourceRoot = util.getArg(aArgs, "sourceRoot", null);
this._skipValidation = util.getArg(aArgs, "skipValidation", false);
this._sources = new ArraySet();
this._names = new ArraySet();
this._mappings = new MappingList();
this._sourcesContents = null;
}
/**
* Creates a new SourceMapGenerator based on a SourceMapConsumer
*
* @param aSourceMapConsumer The SourceMap.
*/
static fromSourceMap(aSourceMapConsumer) {
const sourceRoot = aSourceMapConsumer.sourceRoot;
const generator = new SourceMapGenerator({
file: aSourceMapConsumer.file,
sourceRoot
});
aSourceMapConsumer.eachMapping(function(mapping) {
const newMapping = {
generated: {
line: mapping.generatedLine,
column: mapping.generatedColumn
}
};
if (mapping.source != null) {
newMapping.source = mapping.source;
if (sourceRoot != null) {
newMapping.source = util.relative(sourceRoot, newMapping.source);
}
newMapping.original = {
line: mapping.originalLine,
column: mapping.originalColumn
};
if (mapping.name != null) {
newMapping.name = mapping.name;
}
}
generator.addMapping(newMapping);
});
aSourceMapConsumer.sources.forEach(function(sourceFile) {
let sourceRelative = sourceFile;
if (sourceRoot !== null) {
sourceRelative = util.relative(sourceRoot, sourceFile);
}
if (!generator._sources.has(sourceRelative)) {
generator._sources.add(sourceRelative);
}
const content = aSourceMapConsumer.sourceContentFor(sourceFile);
if (content != null) {
generator.setSourceContent(sourceFile, content);
}
});
return generator;
}
/**
* Add a single mapping from original source line and column to the generated
* source's line and column for this source map being created. The mapping
* object should have the following properties:
*
* - generated: An object with the generated line and column positions.
* - original: An object with the original line and column positions.
* - source: The original source file (relative to the sourceRoot).
* - name: An optional original token name for this mapping.
*/
addMapping(aArgs) {
const generated = util.getArg(aArgs, "generated");
const original = util.getArg(aArgs, "original", null);
let source = util.getArg(aArgs, "source", null);
let name = util.getArg(aArgs, "name", null);
if (!this._skipValidation) {
this._validateMapping(generated, original, source, name);
}
if (source != null) {
source = String(source);
if (!this._sources.has(source)) {
this._sources.add(source);
}
}
if (name != null) {
name = String(name);
if (!this._names.has(name)) {
this._names.add(name);
}
}
this._mappings.add({
generatedLine: generated.line,
generatedColumn: generated.column,
originalLine: original != null && original.line,
originalColumn: original != null && original.column,
source,
name
});
}
/**
* Set the source content for a source file.
*/
setSourceContent(aSourceFile, aSourceContent) {
let source = aSourceFile;
if (this._sourceRoot != null) {
source = util.relative(this._sourceRoot, source);
}
if (aSourceContent != null) {
// Add the source content to the _sourcesContents map.
// Create a new _sourcesContents map if the property is null.
if (!this._sourcesContents) {
this._sourcesContents = Object.create(null);
}
this._sourcesContents[util.toSetString(source)] = aSourceContent;
} else if (this._sourcesContents) {
// Remove the source file from the _sourcesContents map.
// If the _sourcesContents map is empty, set the property to null.
delete this._sourcesContents[util.toSetString(source)];
if (Object.keys(this._sourcesContents).length === 0) {
this._sourcesContents = null;
}
}
}
/**
* Applies the mappings of a sub-source-map for a specific source file to the
* source map being generated. Each mapping to the supplied source file is
* rewritten using the supplied source map. Note: The resolution for the
* resulting mappings is the minimium of this map and the supplied map.
*
* @param aSourceMapConsumer The source map to be applied.
* @param aSourceFile Optional. The filename of the source file.
* If omitted, SourceMapConsumer's file property will be used.
* @param aSourceMapPath Optional. The dirname of the path to the source map
* to be applied. If relative, it is relative to the SourceMapConsumer.
* This parameter is needed when the two source maps aren't in the same
* directory, and the source map to be applied contains relative source
* paths. If so, those relative source paths need to be rewritten
* relative to the SourceMapGenerator.
*/
applySourceMap(aSourceMapConsumer, aSourceFile, aSourceMapPath) {
let sourceFile = aSourceFile;
// If aSourceFile is omitted, we will use the file property of the SourceMap
if (aSourceFile == null) {
if (aSourceMapConsumer.file == null) {
throw new Error(
"SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, " +
'or the source map\'s "file" property. Both were omitted.'
);
}
sourceFile = aSourceMapConsumer.file;
}
const sourceRoot = this._sourceRoot;
// Make "sourceFile" relative if an absolute Url is passed.
if (sourceRoot != null) {
sourceFile = util.relative(sourceRoot, sourceFile);
}
// Applying the SourceMap can add and remove items from the sources and
// the names array.
const newSources = this._mappings.toArray().length > 0
? new ArraySet()
: this._sources;
const newNames = new ArraySet();
// Find mappings for the "sourceFile"
this._mappings.unsortedForEach(function(mapping) {
if (mapping.source === sourceFile && mapping.originalLine != null) {
// Check if it can be mapped by the source map, then update the mapping.
const original = aSourceMapConsumer.originalPositionFor({
line: mapping.originalLine,
column: mapping.originalColumn
});
if (original.source != null) {
// Copy mapping
mapping.source = original.source;
if (aSourceMapPath != null) {
mapping.source = util.join(aSourceMapPath, mapping.source);
}
if (sourceRoot != null) {
mapping.source = util.relative(sourceRoot, mapping.source);
}
mapping.originalLine = original.line;
mapping.originalColumn = original.column;
if (original.name != null) {
mapping.name = original.name;
}
}
}
const source = mapping.source;
if (source != null && !newSources.has(source)) {
newSources.add(source);
}
const name = mapping.name;
if (name != null && !newNames.has(name)) {
newNames.add(name);
}
}, this);
this._sources = newSources;
this._names = newNames;
// Copy sourcesContents of applied map.
aSourceMapConsumer.sources.forEach(function(srcFile) {
const content = aSourceMapConsumer.sourceContentFor(srcFile);
if (content != null) {
if (aSourceMapPath != null) {
srcFile = util.join(aSourceMapPath, srcFile);
}
if (sourceRoot != null) {
srcFile = util.relative(sourceRoot, srcFile);
}
this.setSourceContent(srcFile, content);
}
}, this);
}
/**
* A mapping can have one of the three levels of data:
*
* 1. Just the generated position.
* 2. The Generated position, original position, and original source.
* 3. Generated and original position, original source, as well as a name
* token.
*
* To maintain consistency, we validate that any new mapping being added falls
* in to one of these categories.
*/
_validateMapping(aGenerated, aOriginal, aSource, aName) {
// When aOriginal is truthy but has empty values for .line and .column,
// it is most likely a programmer error. In this case we throw a very
// specific error message to try to guide them the right way.
// For example: https://github.com/Polymer/polymer-bundler/pull/519
if (aOriginal && typeof aOriginal.line !== "number" && typeof aOriginal.column !== "number") {
throw new Error(
"original.line and original.column are not numbers -- you probably meant to omit " +
"the original mapping entirely and only map the generated position. If so, pass " +
"null for the original mapping instead of an object with empty or null values."
);
}
if (aGenerated && "line" in aGenerated && "column" in aGenerated
&& aGenerated.line > 0 && aGenerated.column >= 0
&& !aOriginal && !aSource && !aName) {
// Case 1.
} else if (aGenerated && "line" in aGenerated && "column" in aGenerated
&& aOriginal && "line" in aOriginal && "column" in aOriginal
&& aGenerated.line > 0 && aGenerated.column >= 0
&& aOriginal.line > 0 && aOriginal.column >= 0
&& aSource) {
// Cases 2 and 3.
} else {
throw new Error("Invalid mapping: " + JSON.stringify({
generated: aGenerated,
source: aSource,
original: aOriginal,
name: aName
}));
}
}
/**
* Serialize the accumulated mappings in to the stream of base 64 VLQs
* specified by the source map format.
*/
_serializeMappings() {
let previousGeneratedColumn = 0;
let previousGeneratedLine = 1;
let previousOriginalColumn = 0;
let previousOriginalLine = 0;
let previousName = 0;
let previousSource = 0;
let result = "";
let next;
let mapping;
let nameIdx;
let sourceIdx;
const mappings = this._mappings.toArray();
for (let i = 0, len = mappings.length; i < len; i++) {
mapping = mappings[i];
next = "";
if (mapping.generatedLine !== previousGeneratedLine) {
previousGeneratedColumn = 0;
while (mapping.generatedLine !== previousGeneratedLine) {
next += ";";
previousGeneratedLine++;
}
} else if (i > 0) {
if (!util.compareByGeneratedPositionsInflated(mapping, mappings[i - 1])) {
continue;
}
next += ",";
}
next += base64VLQ.encode(mapping.generatedColumn
- previousGeneratedColumn);
previousGeneratedColumn = mapping.generatedColumn;
if (mapping.source != null) {
sourceIdx = this._sources.indexOf(mapping.source);
next += base64VLQ.encode(sourceIdx - previousSource);
previousSource = sourceIdx;
// lines are stored 0-based in SourceMap spec version 3
next += base64VLQ.encode(mapping.originalLine - 1
- previousOriginalLine);
previousOriginalLine = mapping.originalLine - 1;
next += base64VLQ.encode(mapping.originalColumn
- previousOriginalColumn);
previousOriginalColumn = mapping.originalColumn;
if (mapping.name != null) {
nameIdx = this._names.indexOf(mapping.name);
next += base64VLQ.encode(nameIdx - previousName);
previousName = nameIdx;
}
}
result += next;
}
return result;
}
_generateSourcesContent(aSources, aSourceRoot) {
return aSources.map(function(source) {
if (!this._sourcesContents) {
return null;
}
if (aSourceRoot != null) {
source = util.relative(aSourceRoot, source);
}
const key = util.toSetString(source);
return Object.prototype.hasOwnProperty.call(this._sourcesContents, key)
? this._sourcesContents[key]
: null;
}, this);
}
/**
* Externalize the source map.
*/
toJSON() {
const map = {
version: this._version,
sources: this._sources.toArray(),
names: this._names.toArray(),
mappings: this._serializeMappings()
};
if (this._file != null) {
map.file = this._file;
}
if (this._sourceRoot != null) {
map.sourceRoot = this._sourceRoot;
}
if (this._sourcesContents) {
map.sourcesContent = this._generateSourcesContent(map.sources, map.sourceRoot);
}
return map;
}
/**
* Render the source map being generated to a string.
*/
toString() {
return JSON.stringify(this.toJSON());
}
}
SourceMapGenerator.prototype._version = 3;
exports.SourceMapGenerator = SourceMapGenerator;