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Diffstat (limited to 'node_modules/snapdragon/lib/source-maps.js')
-rw-r--r-- | node_modules/snapdragon/lib/source-maps.js | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/node_modules/snapdragon/lib/source-maps.js b/node_modules/snapdragon/lib/source-maps.js new file mode 100644 index 000000000..d8e638b48 --- /dev/null +++ b/node_modules/snapdragon/lib/source-maps.js @@ -0,0 +1,145 @@ +'use strict'; + +var fs = require('fs'); +var path = require('path'); +var define = require('define-property'); +var utils = require('./utils'); + +/** + * Expose `mixin()`. + * This code is based on `source-maps-support.js` in reworkcss/css + * https://github.com/reworkcss/css/blob/master/lib/stringify/source-map-support.js + * Copyright (c) 2012 TJ Holowaychuk <tj@vision-media.ca> + */ + +module.exports = mixin; + +/** + * Mixin source map support into `compiler`. + * + * @param {Object} `compiler` + * @api public + */ + +function mixin(compiler) { + define(compiler, '_comment', compiler.comment); + compiler.map = new utils.SourceMap.SourceMapGenerator(); + compiler.position = { line: 1, column: 1 }; + compiler.content = {}; + compiler.files = {}; + + for (var key in exports) { + define(compiler, key, exports[key]); + } +} + +/** + * Update position. + * + * @param {String} str + */ + +exports.updatePosition = function(str) { + var lines = str.match(/\n/g); + if (lines) this.position.line += lines.length; + var i = str.lastIndexOf('\n'); + this.position.column = ~i ? str.length - i : this.position.column + str.length; +}; + +/** + * Emit `str` with `position`. + * + * @param {String} str + * @param {Object} [pos] + * @return {String} + */ + +exports.emit = function(str, node) { + var position = node.position || {}; + var source = position.source; + if (source) { + if (position.filepath) { + source = utils.unixify(position.filepath); + } + + this.map.addMapping({ + source: source, + generated: { + line: this.position.line, + column: Math.max(this.position.column - 1, 0) + }, + original: { + line: position.start.line, + column: position.start.column - 1 + } + }); + + if (position.content) { + this.addContent(source, position); + } + if (position.filepath) { + this.addFile(source, position); + } + + this.updatePosition(str); + this.output += str; + } + return str; +}; + +/** + * Adds a file to the source map output if it has not already been added + * @param {String} `file` + * @param {Object} `pos` + */ + +exports.addFile = function(file, position) { + if (typeof position.content !== 'string') return; + if (Object.prototype.hasOwnProperty.call(this.files, file)) return; + this.files[file] = position.content; +}; + +/** + * Adds a content source to the source map output if it has not already been added + * @param {String} `source` + * @param {Object} `position` + */ + +exports.addContent = function(source, position) { + if (typeof position.content !== 'string') return; + if (Object.prototype.hasOwnProperty.call(this.content, source)) return; + this.map.setSourceContent(source, position.content); +}; + +/** + * Applies any original source maps to the output and embeds the source file + * contents in the source map. + */ + +exports.applySourceMaps = function() { + Object.keys(this.files).forEach(function(file) { + var content = this.files[file]; + this.map.setSourceContent(file, content); + + if (this.options.inputSourcemaps === true) { + var originalMap = utils.sourceMapResolve.resolveSync(content, file, fs.readFileSync); + if (originalMap) { + var map = new utils.SourceMap.SourceMapConsumer(originalMap.map); + var relativeTo = originalMap.sourcesRelativeTo; + this.map.applySourceMap(map, file, utils.unixify(path.dirname(relativeTo))); + } + } + }, this); +}; + +/** + * Process comments, drops sourceMap comments. + * @param {Object} node + */ + +exports.comment = function(node) { + if (/^# sourceMappingURL=/.test(node.comment)) { + return this.emit('', node.position); + } + return this._comment(node); +}; |