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127 lines
2.7 KiB
127 lines
2.7 KiB
4 years ago
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/**
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* Module dependencies.
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*/
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var SourceMap = require('source-map').SourceMapGenerator;
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var SourceMapConsumer = require('source-map').SourceMapConsumer;
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var sourceMapResolve = require('source-map-resolve');
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var urix = require('urix');
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var fs = require('fs');
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var path = require('path');
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/**
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* Expose `mixin()`.
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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 {Compiler} compiler
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* @api public
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*/
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function mixin(compiler) {
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compiler._comment = compiler.comment;
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compiler.map = new SourceMap();
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compiler.position = { line: 1, column: 1 };
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compiler.files = {};
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for (var k in exports) compiler[k] = exports[k];
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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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* @api private
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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`.
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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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* @api private
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*/
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exports.emit = function(str, pos) {
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if (pos) {
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var sourceFile = urix(pos.source || 'source.css');
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this.map.addMapping({
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source: sourceFile,
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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: pos.start.line,
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column: pos.start.column - 1
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}
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});
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this.addFile(sourceFile, pos);
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}
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this.updatePosition(str);
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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, pos) {
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if (typeof pos.content !== 'string') return;
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if (Object.prototype.hasOwnProperty.call(this.files, file)) return;
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this.files[file] = pos.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 !== false) {
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var originalMap = sourceMapResolve.resolveSync(
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content, file, fs.readFileSync);
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if (originalMap) {
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var map = new SourceMapConsumer(originalMap.map);
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var relativeTo = originalMap.sourcesRelativeTo;
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this.map.applySourceMap(map, file, urix(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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else
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return this._comment(node);
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};
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