1 files changed, 46 insertions, 0 deletions
diff --git a/node_modules/clean-css/lib/tokenizer/tokenize.js b/node_modules/clean-css/lib/tokenizer/tokenize.js
index 7c071dd93..018b89de8 100644
--- a/node_modules/clean-css/lib/tokenizer/tokenize.js
+++ b/node_modules/clean-css/lib/tokenizer/tokenize.js
@@ -28,6 +28,34 @@ var BLOCK_RULES = [
   '@supports'
 ];
 
+var PAGE_MARGIN_BOXES = [
+  '@bottom-center',
+  '@bottom-left',
+  '@bottom-left-corner',
+  '@bottom-right',
+  '@bottom-right-corner',
+  '@left-bottom',
+  '@left-middle',
+  '@left-top',
+  '@right-bottom',
+  '@right-middle',
+  '@right-top',
+  '@top-center',
+  '@top-left',
+  '@top-left-corner',
+  '@top-right',
+  '@top-right-corner'
+];
+
+var EXTRA_PAGE_BOXES = [
+  '@footnote',
+  '@footnotes',
+  '@left',
+  '@page-float-bottom',
+  '@page-float-top',
+  '@right'
+];
+
 var REPEAT_PATTERN = /^\[\s*\d+\s*\]$/;
 var RULE_WORD_SEPARATOR_PATTERN = /[\s\(]/;
 var TAIL_BROKEN_VALUE_PATTERN = /[\s|\}]*$/;
@@ -221,6 +249,18 @@ function intoTokens(source, externalContext, internalContext, isNested) {
       levels.push(level);
       level = Level.RULE;
       seekingValue = false;
+    } else if (character == Marker.OPEN_CURLY_BRACKET && level == Level.RULE && isPageMarginBox(buffer)) {
+      // open brace opening page-margin box at rule level, e.g. @page{@top-center{<--
+      serializedBuffer = buffer.join('').trim();
+      ruleTokens.push(ruleToken);
+      ruleToken = [Token.AT_RULE_BLOCK, [], []];
+      ruleToken[1].push([Token.AT_RULE_BLOCK_SCOPE, serializedBuffer, [originalMetadata(metadata, serializedBuffer, externalContext)]]);
+      newTokens.push(ruleToken);
+      newTokens = ruleToken[2];
+
+      levels.push(level);
+      level = Level.RULE;
+      buffer = [];
     } else if (character == Marker.COLON && level == Level.RULE && !seekingValue) {
       // colon at rule level, e.g. a{color:<--
       serializedBuffer = buffer.join('').trim();
@@ -467,6 +507,12 @@ function tokenScopeFrom(tokenType) {
   }
 }
 
+function isPageMarginBox(buffer) {
+  var serializedBuffer = buffer.join('').trim();
+
+  return PAGE_MARGIN_BOXES.indexOf(serializedBuffer) > -1 || EXTRA_PAGE_BOXES.indexOf(serializedBuffer) > -1;
+}
+
 function isRepeatToken(buffer) {
   return REPEAT_PATTERN.test(buffer.join('') + Marker.CLOSE_SQUARE_BRACKET);
 }