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

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+var escapePrefix = '__ESCAPED_';
+
+function trackPrefix(value, context, interestingContent) {
+  if (!interestingContent && value.indexOf('\n') == -1) {
+    if (value.indexOf(escapePrefix) === 0) {
+      return value;
+    } else {
+      context.column += value.length;
+      return;
+    }
+  }
+
+  var withoutContent = 0;
+  var split = value.split('\n');
+  var total = split.length;
+  var shift = 0;
+
+  while (true) {
+    if (withoutContent == total - 1)
+      break;
+
+    var part = split[withoutContent];
+    if (/\S/.test(part))
+      break;
+
+    shift += part.length + 1;
+    withoutContent++;
+  }
+
+  context.line += withoutContent;
+  context.column = withoutContent > 0 ? 0 : context.column;
+  context.column += /^(\s)*/.exec(split[withoutContent])[0].length;
+
+  return value.substring(shift).trimLeft();
+}
+
+function sourceFor(originalMetadata, contextMetadata, context) {
+  var source = originalMetadata.source || contextMetadata.source;
+
+  if (source && context.resolvePath)
+    return context.resolvePath(contextMetadata.source, source);
+
+  return source;
+}
+
+function snapshot(data, context, fallbacks) {
+  var metadata = {
+    line: context.line,
+    column: context.column,
+    source: context.source
+  };
+  var sourceContent = null;
+  var sourceMetadata = context.sourceMapTracker.isTracking(metadata.source) ?
+    context.sourceMapTracker.originalPositionFor(metadata, data, fallbacks || 0) :
+    {};
+
+  metadata.line = sourceMetadata.line || metadata.line;
+  metadata.column = sourceMetadata.column || metadata.column;
+  metadata.source = sourceMetadata.sourceResolved ?
+    sourceMetadata.source :
+    sourceFor(sourceMetadata, metadata, context);
+
+  if (context.sourceMapInlineSources) {
+    var sourceMapSourcesContent = context.sourceMapTracker.sourcesContentFor(context.source);
+    sourceContent = sourceMapSourcesContent && sourceMapSourcesContent[metadata.source] ?
+      sourceMapSourcesContent :
+      context.sourceReader.sourceAt(context.source);
+  }
+
+  return sourceContent ?
+    [metadata.line, metadata.column, metadata.source, sourceContent] :
+    [metadata.line, metadata.column, metadata.source];
+}
+
+function trackSuffix(data, context) {
+  var parts = data.split('\n');
+
+  for (var i = 0, l = parts.length; i < l; i++) {
+    var part = parts[i];
+    var cursor = 0;
+
+    if (i > 0) {
+      context.line++;
+      context.column = 0;
+    }
+
+    while (true) {
+      var next = part.indexOf(escapePrefix, cursor);
+
+      if (next == -1) {
+        context.column += part.substring(cursor).length;
+        break;
+      }
+
+      context.column += next - cursor;
+      cursor += next - cursor;
+
+      var escaped = part.substring(next, part.indexOf('__', next + 1) + 2);
+      var encodedValues = escaped.substring(escaped.indexOf('(') + 1, escaped.indexOf(')')).split(',');
+      context.line += ~~encodedValues[0];
+      context.column = (~~encodedValues[0] === 0 ? context.column : 0) + ~~encodedValues[1];
+      cursor += escaped.length;
+    }
+  }
+}
+
+function track(data, context, snapshotMetadata, fallbacks) {
+  var untracked = trackPrefix(data, context, snapshotMetadata);
+  var metadata = snapshotMetadata ?
+    snapshot(untracked, context, fallbacks) :
+    [];
+
+  if (untracked)
+    trackSuffix(untracked, context);
+
+  return metadata;
+}
+
+module.exports = track;