Generate a series of nested switch statements to parse CSSPrimitiveValue units.

third_party/WebKit/Source/core/css/CSSPrimitiveValue.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/css/CSSPrimitiveValue.h"
 
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSHelper.h"
 #include "core/css/CSSMarkup.h"
+#include "core/css/CSSPrimitiveValueUnitTrie.h"
 #include "core/css/CSSToLengthConversionData.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Node.h"
 #include "core/style/ComputedStyle.h"
 #include "platform/LayoutUnit.h"
 #include "platform/fonts/FontMetrics.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace WTF;
 
 namespace blink {
 
 namespace {
 
 // Max/min values for CSS, needs to slightly smaller/larger than the true max/min values to allow for rounding without overflowing.
 // Subtract two (rather than one) to allow for values to be converted to float and back without exceeding the LayoutUnit::max.
 const int maxValueForCssLength = INT_MAX / kFixedPointDenominator - 2;
 const int minValueForCssLength = INT_MIN / kFixedPointDenominator + 2;
 
-using StringToUnitTable = HashMap<String, CSSPrimitiveValue::UnitType>;
-
-StringToUnitTable createStringToUnitTable()
-{
-    StringToUnitTable table;
-    table.set(String("em"), CSSPrimitiveValue::UnitType::Ems);
-    table.set(String("ex"), CSSPrimitiveValue::UnitType::Exs);
-    table.set(String("px"), CSSPrimitiveValue::UnitType::Pixels);
-    table.set(String("cm"), CSSPrimitiveValue::UnitType::Centimeters);
-    table.set(String("mm"), CSSPrimitiveValue::UnitType::Millimeters);
-    table.set(String("in"), CSSPrimitiveValue::UnitType::Inches);
-    table.set(String("pt"), CSSPrimitiveValue::UnitType::Points);
-    table.set(String("pc"), CSSPrimitiveValue::UnitType::Picas);
-    table.set(String(""), CSSPrimitiveValue::UnitType::UserUnits);
-    table.set(String("deg"), CSSPrimitiveValue::UnitType::Degrees);
-    table.set(String("rad"), CSSPrimitiveValue::UnitType::Radians);
-    table.set(String("grad"), CSSPrimitiveValue::UnitType::Gradians);
-    table.set(String("ms"), CSSPrimitiveValue::UnitType::Milliseconds);
-    table.set(String("s"), CSSPrimitiveValue::UnitType::Seconds);
-    table.set(String("hz"), CSSPrimitiveValue::UnitType::Hertz);
-    table.set(String("khz"), CSSPrimitiveValue::UnitType::Kilohertz);
-    table.set(String("dpi"), CSSPrimitiveValue::UnitType::DotsPerInch);
-    table.set(String("dpcm"), CSSPrimitiveValue::UnitType::DotsPerCentimeter);
-    table.set(String("dppx"), CSSPrimitiveValue::UnitType::DotsPerPixel);
-    table.set(String("vw"), CSSPrimitiveValue::UnitType::ViewportWidth);
-    table.set(String("vh"), CSSPrimitiveValue::UnitType::ViewportHeight);
-    table.set(String("vmin"), CSSPrimitiveValue::UnitType::ViewportMin);
-    table.set(String("vmax"), CSSPrimitiveValue::UnitType::ViewportMax);
-    table.set(String("rem"), CSSPrimitiveValue::UnitType::Rems);
-    table.set(String("fr"), CSSPrimitiveValue::UnitType::Fraction);
-    table.set(String("turn"), CSSPrimitiveValue::UnitType::Turns);
-    table.set(String("ch"), CSSPrimitiveValue::UnitType::Chs);
-    table.set(String("__qem"), CSSPrimitiveValue::UnitType::QuirkyEms);
-    return table;
-}
-
-StringToUnitTable& unitTable()
-{
-    DEFINE_STATIC_LOCAL(StringToUnitTable, unitTable, (createStringToUnitTable()));
-    return unitTable;
-}
-
 } // namespace
 
 float CSSPrimitiveValue::clampToCSSLengthRange(double value)
 {
     return clampTo<float>(value, minValueForCssLength, maxValueForCssLength);
 }
 
-void CSSPrimitiveValue::initUnitTable()
-{
-    // Make sure we initialize this during blink initialization
-    // to avoid racy static local initialization.
-    unitTable();
-}
-
-CSSPrimitiveValue::UnitType CSSPrimitiveValue::fromName(const String& unit)
-{
-    return unitTable().get(unit.lower());
-}
-
 CSSPrimitiveValue::UnitCategory CSSPrimitiveValue::unitTypeToUnitCategory(UnitType type)
 {
     switch (type) {
     case UnitType::Number:
         return CSSPrimitiveValue::UNumber;
     case UnitType::Percentage:
         return CSSPrimitiveValue::UPercent;
     case UnitType::Pixels:
     case UnitType::Centimeters:
     case UnitType::Millimeters:
@@ skipping 657 matching lines @@
     case UnitType::Calc:
         visitor->trace(m_value.calc);
         break;
     default:
         break;
     }
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink