Implements CSSPropertyAPI for the text-indent property.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPITextIndent.cpp

+// Copyright 2017 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/properties/CSSPropertyAPITextIndent.h"
+
+#include "core/css/CSSValueList.h"
+#include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+#include "platform/RuntimeEnabledFeatures.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPITextIndent::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext* context) {
+  // [ <length> | <percentage> ] && hanging? && each-line?
+  // Keywords only allowed when css3Text is enabled.
+  CSSValueList* list = CSSValueList::createSpaceSeparated();
+
+  bool hasLengthOrPercentage = false;
+  bool hasEachLine = false;
+  bool hasHanging = false;
+
+  do {
+    if (!hasLengthOrPercentage) {
+      if (CSSValue* textIndent =
+              CSSPropertyParserHelpers::consumeLengthOrPercent(
+                  range, context->mode(), ValueRangeAll,
+                  CSSPropertyParserHelpers::UnitlessQuirk::Allow)) {
+        list->append(*textIndent);
+        hasLengthOrPercentage = true;
+        continue;
+      }
+    }
+
+    if (RuntimeEnabledFeatures::css3TextEnabled()) {
+      CSSValueID id = range.peek().id();
+      if (!hasEachLine && id == CSSValueEachLine) {
+        list->append(*CSSPropertyParserHelpers::consumeIdent(range));
+        hasEachLine = true;
+        continue;
+      }
+      if (!hasHanging && id == CSSValueHanging) {
+        list->append(*CSSPropertyParserHelpers::consumeIdent(range));
+        hasHanging = true;
+        continue;
+      }
+    }
+    return nullptr;
+  } while (!range.atEnd());
+
+  if (!hasLengthOrPercentage)
+    return nullptr;
+
+  return list;
+}
+
+}  // namespace blink