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node_modules/clean-css/lib/text/free-text-processor.js

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+var EscapeStore = require('./escape-store');
+var QuoteScanner = require('../utils/quote-scanner');
+
+var lineBreak = require('os').EOL;
+
+function FreeTextProcessor(saveWaypoints) {
+  this.matches = new EscapeStore('FREE_TEXT');
+  this.saveWaypoints = saveWaypoints;
+}
+
+// Strip content tags by replacing them by the a special
+// marker for further restoring. It's done via string scanning
+// instead of regexps to speed up the process.
+FreeTextProcessor.prototype.escape = function (data) {
+  var self = this;
+  var breaksCount;
+  var lastBreakAt;
+  var indent;
+  var metadata;
+  var saveWaypoints = this.saveWaypoints;
+
+  return new QuoteScanner(data).each(function (match, store) {
+    if (saveWaypoints) {
+      breaksCount = match.split(lineBreak).length - 1;
+      lastBreakAt = match.lastIndexOf(lineBreak);
+      indent = lastBreakAt > 0 ?
+        match.substring(lastBreakAt + lineBreak.length).length :
+        match.length;
+      metadata = [breaksCount, indent];
+    }
+
+    var placeholder = self.matches.store(match, metadata);
+    store.push(placeholder);
+  });
+};
+
+function normalize(text, data, prefixContext, cursor) {
+  // FIXME: this is even a bigger hack now - see #407
+  var searchIn = data;
+  if (prefixContext) {
+    searchIn = prefixContext + data.substring(0, data.indexOf('__ESCAPED_FREE_TEXT_CLEAN_CSS'));
+    cursor = searchIn.length;
+  }
+
+  var lastSemicolon = searchIn.lastIndexOf(';', cursor);
+  var lastOpenBrace = searchIn.lastIndexOf('{', cursor);
+  var lastOne = 0;
+
+  if (lastSemicolon > -1 && lastOpenBrace > -1)
+    lastOne = Math.max(lastSemicolon, lastOpenBrace);
+  else if (lastSemicolon == -1)
+    lastOne = lastOpenBrace;
+  else
+    lastOne = lastSemicolon;
+
+  var context = searchIn.substring(lastOne + 1, cursor);
+
+  if (/\[[\w\d\-]+[\*\|\~\^\$]?=$/.test(context)) {
+    text = text
+      .replace(/\\\n|\\\r\n/g, '')
+      .replace(/\n|\r\n/g, '');
+  }
+
+  if (/^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/.test(text) && !/format\($/.test(context)) {
+    var isFont = /^(font|font\-family):/.test(context);
+    var isAttribute = /\[[\w\d\-]+[\*\|\~\^\$]?=$/.test(context);
+    var isKeyframe = /@(-moz-|-o-|-webkit-)?keyframes /.test(context);
+    var isAnimation = /^(-moz-|-o-|-webkit-)?animation(-name)?:/.test(context);
+
+    if (isFont || isAttribute || isKeyframe || isAnimation)
+      text = text.substring(1, text.length - 1);
+  }
+
+  return text;
+}
+
+FreeTextProcessor.prototype.restore = function (data, prefixContext) {
+  var tempData = [];
+  var cursor = 0;
+
+  for (; cursor < data.length;) {
+    var nextMatch = this.matches.nextMatch(data, cursor);
+    if (nextMatch.start < 0)
+      break;
+
+    tempData.push(data.substring(cursor, nextMatch.start));
+    var text = normalize(this.matches.restore(nextMatch.match), data, prefixContext, nextMatch.start);
+    tempData.push(text);
+
+    cursor = nextMatch.end;
+  }
+
+  return tempData.length > 0 ?
+    tempData.join('') + data.substring(cursor, data.length) :
+    data;
+};
+
+module.exports = FreeTextProcessor;