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