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server/libs/css/stringify/source-map-support.js

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+
+/**
+ * Module dependencies.
+ */
+
+var SourceMap = require('source-map').SourceMapGenerator;
+var SourceMapConsumer = require('source-map').SourceMapConsumer;
+var sourceMapResolve = require('source-map-resolve');
+var fs = require('fs');
+var path = require('path');
+
+/**
+ * Expose `mixin()`.
+ */
+
+module.exports = mixin;
+
+/**
+ * Ensure Windows-style paths are formatted properly
+ */
+
+const makeFriendlyPath = function(aPath) {
+  return path.sep === "\\" ? aPath.replace(/\\/g, "/").replace(/^[a-z]:\/?/i, "/") : aPath;
+}
+
+/**
+ * Mixin source map support into `compiler`.
+ *
+ * @param {Compiler} compiler
+ * @api public
+ */
+
+function mixin(compiler) {
+  compiler._comment = compiler.comment;
+  compiler.map = new SourceMap();
+  compiler.position = { line: 1, column: 1 };
+  compiler.files = {};
+  for (var k in exports) compiler[k] = exports[k];
+}
+
+/**
+ * Update position.
+ *
+ * @param {String} str
+ * @api private
+ */
+
+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`.
+ *
+ * @param {String} str
+ * @param {Object} [pos]
+ * @return {String}
+ * @api private
+ */
+
+exports.emit = function(str, pos) {
+  if (pos) {
+    var sourceFile = makeFriendlyPath(pos.source || 'source.css');
+
+    this.map.addMapping({
+      source: sourceFile,
+      generated: {
+        line: this.position.line,
+        column: Math.max(this.position.column - 1, 0)
+      },
+      original: {
+        line: pos.start.line,
+        column: pos.start.column - 1
+      }
+    });
+
+    this.addFile(sourceFile, pos);
+  }
+
+  this.updatePosition(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, pos) {
+  if (typeof pos.content !== 'string') return;
+  if (Object.prototype.hasOwnProperty.call(this.files, file)) return;
+
+  this.files[file] = pos.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 !== false) {
+      var originalMap = sourceMapResolve.resolveSync(
+        content, file, fs.readFileSync);
+      if (originalMap) {
+        var map = new SourceMapConsumer(originalMap.map);
+        var relativeTo = originalMap.sourcesRelativeTo;
+        this.map.applySourceMap(map, file, makeFriendlyPath(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);
+  else
+    return this._comment(node);
+};