CSS Properties & Values API: Support <resolution> values

third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSGradientValue.h"
@@ skipping 295 matching lines @@
     return nullptr;
   }
   CalcParser calcParser(range, valueRange);
   if (const CSSCalcValue* calculation = calcParser.value()) {
     if (calculation->category() == CalcTime)
       return calcParser.consumeValue();
   }
   return nullptr;
 }
 
+CSSPrimitiveValue* consumeResolution(CSSParserTokenRange& range) {
+  const CSSParserToken& token = range.peek();
+  // Unlike the other types, calc() does not work with <resolution>.
+  if (token.type() != DimensionToken)
+    return nullptr;
+  CSSPrimitiveValue::UnitType unit = token.unitType();
+  if (unit == CSSPrimitiveValue::UnitType::DotsPerPixel ||
+      unit == CSSPrimitiveValue::UnitType::DotsPerInch ||
+      unit == CSSPrimitiveValue::UnitType::DotsPerCentimeter) {
+    return CSSPrimitiveValue::create(
+        range.consumeIncludingWhitespace().numericValue(), unit);
+  }
+  return nullptr;
+}
+
 CSSIdentifierValue* consumeIdent(CSSParserTokenRange& range) {
   if (range.peek().type() != IdentToken)
     return nullptr;
   return CSSIdentifierValue::create(range.consumeIncludingWhitespace().id());
 }
 
 CSSIdentifierValue* consumeIdentRange(CSSParserTokenRange& range,
                                       CSSValueID lower,
                                       CSSValueID upper) {
   if (range.peek().id() < lower || range.peek().id() > upper)
@@ skipping 907 matching lines @@
 
 // https://drafts.csswg.org/css-shapes-1/#typedef-shape-box
 CSSIdentifierValue* consumeShapeBox(CSSParserTokenRange& range) {
   return consumeIdent<CSSValueContentBox, CSSValuePaddingBox, CSSValueBorderBox,
                       CSSValueMarginBox>(range);
 }
 
 }  // namespace CSSPropertyParserHelpers
 
 }  // namespace blink