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node_modules/clean-css/lib/stringifier/source-maps.js

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+var SourceMapGenerator = require('source-map').SourceMapGenerator;
+var all = require('./helpers').all;
+
+var isWindows = process.platform == 'win32';
+var unknownSource = '$stdin';
+
+function store(element, context) {
+  var fromString = typeof element == 'string';
+  var value = fromString ? element : element[0];
+
+  if (value.indexOf('_') > -1)
+    value = context.restore(value, prefixContentFrom(context.output));
+
+  track(value, fromString ? null : element, context);
+  context.output.push(value);
+}
+
+function prefixContentFrom(values) {
+  var content = [];
+
+  for (var i = values.length - 1; i >= 0; i--) {
+    var value = values[i];
+    content.unshift(value);
+
+    if (value == '{' || value == ';')
+      break;
+  }
+
+  return content.join('');
+}
+
+function track(value, element, context) {
+  if (element)
+    trackAllMappings(element, context);
+
+  var parts = value.split('\n');
+  context.line += parts.length - 1;
+  context.column = parts.length > 1 ? 0 : (context.column + parts.pop().length);
+}
+
+function trackAllMappings(element, context) {
+  var mapping = element[element.length - 1];
+
+  if (!Array.isArray(mapping))
+    return;
+
+  for (var i = 0, l = mapping.length; i < l; i++) {
+    trackMapping(mapping[i], context);
+  }
+}
+
+function trackMapping(mapping, context) {
+  var source = mapping[2] || unknownSource;
+
+  if (isWindows)
+    source = source.replace(/\\/g, '/');
+
+  context.outputMap.addMapping({
+    generated: {
+      line: context.line,
+      column: context.column
+    },
+    source: source,
+    original: {
+      line: mapping[0],
+      column: mapping[1]
+    }
+  });
+
+  if (mapping[3])
+    context.outputMap.setSourceContent(source, mapping[3][mapping[2]]);
+}
+
+function stringify(tokens, options, restoreCallback, inputMapTracker) {
+  var context = {
+    column: 0,
+    inputMapTracker: inputMapTracker,
+    keepBreaks: options.keepBreaks,
+    line: 1,
+    output: [],
+    outputMap: new SourceMapGenerator(),
+    restore: restoreCallback,
+    sourceMapInlineSources: options.sourceMapInlineSources,
+    spaceAfterClosingBrace: options.compatibility.properties.spaceAfterClosingBrace,
+    store: store
+  };
+
+  all(tokens, context, false);
+
+  return {
+    sourceMap: context.outputMap,
+    styles: context.output.join('').trim()
+  };
+}
+
+module.exports = stringify;