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index.js
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index.js
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'use strict';
var through = require('through2');
var fs = require('graceful-fs');
var path = require('path');
var File = require('vinyl');
var convert = require('convert-source-map');
var stripBom = require('strip-bom');
var detectNewline = require('detect-newline');
var acorn = require('acorn');
var SourceMapGenerator = require('source-map').SourceMapGenerator;
var css = require('css');
var PLUGIN_NAME = 'gulp-sourcemap';
var urlRegex = /^(https?|webpack(-[^:]+)?):\/\//;
/**
* Initialize source mapping chain
*/
module.exports.init = function init(options) {
function sourceMapInit(file, encoding, callback) {
/*jshint validthis:true */
// pass through if file is null or already has a source map
if (file.isNull() || file.sourceMap) {
this.push(file);
return callback();
}
if (file.isStream()) {
return callback(new Error(PLUGIN_NAME + '-init: Streaming not supported'));
}
if (options === undefined) {
options = {};
}
var fileContent = file.contents.toString();
var sourceMap;
if (options.loadMaps) {
var sourcePath = ''; //root path for the sources in the map
// Try to read inline source map
sourceMap = convert.fromSource(fileContent);
if (sourceMap) {
sourceMap = sourceMap.toObject();
// sources in map are relative to the source file
sourcePath = path.dirname(file.path);
fileContent = convert.removeComments(fileContent);
} else {
// look for source map comment referencing a source map file
var mapComment = convert.mapFileCommentRegex.exec(fileContent);
var mapFile;
if (mapComment) {
mapFile = path.resolve(path.dirname(file.path), mapComment[1] || mapComment[2]);
fileContent = convert.removeMapFileComments(fileContent);
// if no comment try map file with same name as source file
} else {
mapFile = file.path + '.map';
}
// sources in external map are relative to map file
sourcePath = path.dirname(mapFile);
try {
sourceMap = JSON.parse(stripBom(fs.readFileSync(mapFile, 'utf8')));
} catch(e) {}
}
// fix source paths and sourceContent for imported source map
if (sourceMap) {
sourceMap.sourcesContent = sourceMap.sourcesContent || [];
sourceMap.sources.forEach(function(source, i) {
if (source.match(urlRegex)) {
sourceMap.sourcesContent[i] = sourceMap.sourcesContent[i] || null;
return;
}
var absPath = path.resolve(sourcePath, source);
sourceMap.sources[i] = unixStylePath(path.relative(file.base, absPath));
if (!sourceMap.sourcesContent[i]) {
var sourceContent = null;
if (sourceMap.sourceRoot) {
if (sourceMap.sourceRoot.match(urlRegex)) {
sourceMap.sourcesContent[i] = null;
return;
}
absPath = path.resolve(sourcePath, sourceMap.sourceRoot, source);
}
// if current file: use content
if (absPath === file.path) {
sourceContent = fileContent;
// else load content from file
} else {
try {
if (options.debug)
console.log(PLUGIN_NAME + '-init: No source content for "' + source + '". Loading from file.');
sourceContent = stripBom(fs.readFileSync(absPath, 'utf8'));
} catch (e) {
if (options.debug)
console.warn(PLUGIN_NAME + '-init: source file not found: ' + absPath);
}
}
sourceMap.sourcesContent[i] = sourceContent;
}
});
// remove source map comment from source
file.contents = new Buffer(fileContent, 'utf8');
}
}
if (!sourceMap && options.identityMap) {
var fileType = path.extname(file.path);
var source = unixStylePath(file.relative);
var generator = new SourceMapGenerator({file: source});
if (fileType === '.js') {
var tokenizer = acorn.tokenizer(fileContent, {locations: true});
while (true) {
var token = tokenizer.getToken();
if (token.type.label === "eof")
break;
var mapping = {
original: token.loc.start,
generated: token.loc.start,
source: source,
};
if (token.type.label === 'name') {
mapping.name = token.value;
}
generator.addMapping(mapping);
}
generator.setSourceContent(source, fileContent);
sourceMap = generator.toJSON();
} else if (fileType === '.css') {
var ast = css.parse(fileContent, {silent: true});
var registerTokens = function(ast) {
if (ast.position) {
generator.addMapping({
original: ast.position.start,
generated: ast.position.start,
source: source,
});
}
for (var key in ast) {
if (key !== "position") {
if (Object.prototype.toString.call(ast[key]) === '[object Object]') {
registerTokens(ast[key]);
} else if (ast[key].constructor === Array) {
for (var i = 0; i < ast[key].length; i++) {
registerTokens(ast[key][i]);
}
}
}
}
};
registerTokens(ast);
generator.setSourceContent(source, fileContent);
sourceMap = generator.toJSON();
}
}
if (!sourceMap) {
// Make an empty source map
sourceMap = {
version : 3,
names: [],
mappings: '',
sources: [unixStylePath(file.relative)],
sourcesContent: [fileContent]
};
}
sourceMap.file = unixStylePath(file.relative);
file.sourceMap = sourceMap;
this.push(file);
callback();
}
return through.obj(sourceMapInit);
};
/**
* Write the source map
*
* @param options options to change the way the source map is written
*
*/
module.exports.write = function write(destPath, options) {
if (options === undefined && Object.prototype.toString.call(destPath) === '[object Object]') {
options = destPath;
destPath = undefined;
}
options = options || {};
// set defaults for options if unset
if (options.includeContent === undefined)
options.includeContent = true;
if (options.addComment === undefined)
options.addComment = true;
if (options.charset === undefined)
options.charset = "utf8";
function sourceMapWrite(file, encoding, callback) {
/*jshint validthis:true */
if (file.isNull() || !file.sourceMap) {
this.push(file);
return callback();
}
if (file.isStream()) {
return callback(new Error(PLUGIN_NAME + '-write: Streaming not supported'));
}
var sourceMap = file.sourceMap;
// fix paths if Windows style paths
sourceMap.file = unixStylePath(file.relative);
if (options.mapSources && typeof options.mapSources === 'function') {
sourceMap.sources = sourceMap.sources.map(function(filePath) {
return options.mapSources(filePath);
});
}
sourceMap.sources = sourceMap.sources.map(function(filePath) {
return unixStylePath(filePath);
});
if (typeof options.sourceRoot === 'function') {
sourceMap.sourceRoot = options.sourceRoot(file);
} else {
sourceMap.sourceRoot = options.sourceRoot;
}
if (sourceMap.sourceRoot === null) {
sourceMap.sourceRoot = undefined;
}
if (options.includeContent) {
sourceMap.sourcesContent = sourceMap.sourcesContent || [];
// load missing source content
for (var i = 0; i < file.sourceMap.sources.length; i++) {
if (!sourceMap.sourcesContent[i]) {
var sourcePath = path.resolve(sourceMap.sourceRoot || file.base, sourceMap.sources[i]);
try {
if (options.debug)
console.log(PLUGIN_NAME + '-write: No source content for "' + sourceMap.sources[i] + '". Loading from file.');
sourceMap.sourcesContent[i] = stripBom(fs.readFileSync(sourcePath, 'utf8'));
} catch (e) {
if (options.debug)
console.warn(PLUGIN_NAME + '-write: source file not found: ' + sourcePath);
}
}
}
} else {
delete sourceMap.sourcesContent;
}
var extension = file.relative.split('.').pop();
var newline = detectNewline(file.contents.toString());
var commentFormatter;
switch (extension) {
case 'css':
commentFormatter = function(url) {
return newline + "/*# sourceMappingURL=" + url + " */" + newline;
};
break;
case 'js':
commentFormatter = function(url) {
return newline + "//# sourceMappingURL=" + url + newline;
};
break;
default:
commentFormatter = function(url) { return ""; };
}
var comment, sourceMappingURLPrefix;
if (destPath === undefined || destPath === null) {
// encode source map into comment
var base64Map = new Buffer(JSON.stringify(sourceMap)).toString('base64');
comment = commentFormatter('data:application/json;charset=' + options.charset + ';base64,' + base64Map);
} else {
var mapFile = path.join(destPath, file.relative) + '.map';
// custom map file name
if (options.mapFile && typeof options.mapFile === 'function') {
mapFile = options.mapFile(mapFile);
}
var sourceMapPath = path.join(file.base, mapFile);
// if explicit destination path is set
if (options.destPath) {
var destSourceMapPath = path.join(file.cwd, options.destPath, mapFile);
var destFilePath = path.join(file.cwd, options.destPath, file.relative);
sourceMap.file = unixStylePath(path.relative(path.dirname(destSourceMapPath), destFilePath));
if (sourceMap.sourceRoot === undefined) {
sourceMap.sourceRoot = unixStylePath(path.relative(path.dirname(destSourceMapPath), file.base));
} else if (sourceMap.sourceRoot === '' || (sourceMap.sourceRoot && sourceMap.sourceRoot[0] === '.')) {
sourceMap.sourceRoot = unixStylePath(path.join(path.relative(path.dirname(destSourceMapPath), file.base), sourceMap.sourceRoot));
}
} else {
// best effort, can be incorrect if options.destPath not set
sourceMap.file = unixStylePath(path.relative(path.dirname(sourceMapPath), file.path));
if (sourceMap.sourceRoot === '' || (sourceMap.sourceRoot && sourceMap.sourceRoot[0] === '.')) {
sourceMap.sourceRoot = unixStylePath(path.join(path.relative(path.dirname(sourceMapPath), file.base), sourceMap.sourceRoot));
}
}
// add new source map file to stream
var sourceMapFile = new File({
cwd: file.cwd,
base: file.base,
path: sourceMapPath,
contents: new Buffer(JSON.stringify(sourceMap)),
stat: {
isFile: function () { return true; },
isDirectory: function () { return false; },
isBlockDevice: function () { return false; },
isCharacterDevice: function () { return false; },
isSymbolicLink: function () { return false; },
isFIFO: function () { return false; },
isSocket: function () { return false; }
}
});
this.push(sourceMapFile);
var sourceMapPathRelative = path.relative(path.dirname(file.path), sourceMapPath);
if (options.sourceMappingURLPrefix) {
var prefix = '';
if (typeof options.sourceMappingURLPrefix === 'function') {
prefix = options.sourceMappingURLPrefix(file);
} else {
prefix = options.sourceMappingURLPrefix;
}
sourceMapPathRelative = prefix+path.join('/', sourceMapPathRelative);
}
comment = commentFormatter(unixStylePath(sourceMapPathRelative));
if (options.sourceMappingURL && typeof options.sourceMappingURL === 'function') {
comment = commentFormatter(options.sourceMappingURL(file));
}
}
// append source map comment
if (options.addComment)
file.contents = Buffer.concat([file.contents, new Buffer(comment)]);
this.push(file);
callback();
}
return through.obj(sourceMapWrite);
};
function unixStylePath(filePath) {
return filePath.split(path.sep).join('/');
}