// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "xfa/fde/css/cfde_cssstyleselector.h"

#include <algorithm>
#include <utility>

#include "third_party/base/ptr_util.h"
#include "xfa/fde/css/cfde_cssaccelerator.h"
#include "xfa/fde/css/cfde_csscolorvalue.h"
#include "xfa/fde/css/cfde_csscomputedstyle.h"
#include "xfa/fde/css/cfde_csscustomproperty.h"
#include "xfa/fde/css/cfde_cssdeclaration.h"
#include "xfa/fde/css/cfde_cssenumvalue.h"
#include "xfa/fde/css/cfde_csspropertyholder.h"
#include "xfa/fde/css/cfde_cssselector.h"
#include "xfa/fde/css/cfde_cssstylesheet.h"
#include "xfa/fde/css/cfde_csssyntaxparser.h"
#include "xfa/fde/css/cfde_csstagcache.h"
#include "xfa/fde/css/cfde_cssvaluelist.h"
#include "xfa/fxfa/app/cxfa_csstagprovider.h"

namespace {

template <class T>
T* ToValue(CFDE_CSSValue* val) {
  return static_cast<T*>(val);
}

template <class T>
const T* ToValue(const CFDE_CSSValue* val) {
  return static_cast<T*>(val);
}

}  // namespace

#define FDE_CSSUNIVERSALHASH ('*')

CFDE_CSSStyleSelector::CFDE_CSSStyleSelector(CFGAS_FontMgr* pFontMgr)
    : m_pFontMgr(pFontMgr), m_fDefFontSize(12.0f) {}

CFDE_CSSStyleSelector::~CFDE_CSSStyleSelector() {}

void CFDE_CSSStyleSelector::SetDefFontSize(FX_FLOAT fFontSize) {
  ASSERT(fFontSize > 0);
  m_fDefFontSize = fFontSize;
}

CFDE_CSSAccelerator* CFDE_CSSStyleSelector::InitAccelerator() {
  if (!m_pAccelerator)
    m_pAccelerator = pdfium::MakeUnique<CFDE_CSSAccelerator>();
  m_pAccelerator->Clear();
  return m_pAccelerator.get();
}

CFDE_CSSComputedStyle* CFDE_CSSStyleSelector::CreateComputedStyle(
    CFDE_CSSComputedStyle* pParentStyle) {
  CFDE_CSSComputedStyle* pStyle = new CFDE_CSSComputedStyle();
  if (pParentStyle)
    pStyle->m_InheritedData = pParentStyle->m_InheritedData;
  return pStyle;
}

void CFDE_CSSStyleSelector::SetUAStyleSheet(
    std::unique_ptr<CFDE_CSSStyleSheet> pSheet) {
  m_UAStyles = std::move(pSheet);
}

void CFDE_CSSStyleSelector::UpdateStyleIndex() {
  m_UARules.Clear();
  m_UARules.AddRulesFrom(m_UAStyles.get(), m_pFontMgr);
}

int32_t CFDE_CSSStyleSelector::MatchDeclarations(
    CXFA_CSSTagProvider* pTag,
    CFX_ArrayTemplate<CFDE_CSSDeclaration*>& matchedDecls,
    FDE_CSSPseudo ePseudoType) {
  ASSERT(pTag);
  CFDE_CSSTagCache* pCache = m_pAccelerator->top();
  ASSERT(pCache && pCache->GetTag() == pTag);

  matchedDecls.RemoveAt(0, matchedDecls.GetSize());

  if (m_UARules.CountSelectors() == 0)
    return 0;

  if (ePseudoType == FDE_CSSPseudo::NONE) {
    MatchRules(pCache, m_UARules.GetUniversalRuleData(), ePseudoType);
    if (pCache->HashTag()) {
      MatchRules(pCache, m_UARules.GetTagRuleData(pCache->HashTag()),
                 ePseudoType);
    }
    int32_t iCount = pCache->CountHashClass();
    for (int32_t i = 0; i < iCount; i++) {
      pCache->SetClassIndex(i);
      MatchRules(pCache, m_UARules.GetClassRuleData(pCache->HashClass()),
                 ePseudoType);
    }
  } else {
    MatchRules(pCache, m_UARules.GetPseudoRuleData(), ePseudoType);
  }

  std::sort(m_MatchedRules.begin(), m_MatchedRules.end(),
            [](const CFDE_CSSRuleCollection::Data* p1,
               const CFDE_CSSRuleCollection::Data* p2) {
              return p1->dwPriority < p2->dwPriority;
            });
  for (const auto& rule : m_MatchedRules)
    matchedDecls.Add(rule->pDeclaration);
  m_MatchedRules.clear();

  return matchedDecls.GetSize();
}

void CFDE_CSSStyleSelector::MatchRules(CFDE_CSSTagCache* pCache,
                                       CFDE_CSSRuleCollection::Data* pList,
                                       FDE_CSSPseudo ePseudoType) {
  while (pList) {
    if (MatchSelector(pCache, pList->pSelector, ePseudoType))
      m_MatchedRules.push_back(pList);
    pList = pList->pNext;
  }
}

bool CFDE_CSSStyleSelector::MatchSelector(CFDE_CSSTagCache* pCache,
                                          CFDE_CSSSelector* pSel,
                                          FDE_CSSPseudo ePseudoType) {
  uint32_t dwHash;
  while (pSel && pCache) {
    switch (pSel->GetType()) {
      case FDE_CSSSelectorType::Descendant:
        dwHash = pSel->GetNameHash();
        while ((pCache = pCache->GetParent()) != nullptr) {
          if (dwHash != FDE_CSSUNIVERSALHASH && dwHash != pCache->HashTag()) {
            continue;
          }
          if (MatchSelector(pCache, pSel->GetNextSelector(), ePseudoType)) {
            return true;
          }
        }
        return false;
      case FDE_CSSSelectorType::ID:
        dwHash = pCache->HashID();
        if (dwHash != pSel->GetNameHash()) {
          return false;
        }
        break;
      case FDE_CSSSelectorType::Class:
        dwHash = pCache->HashClass();
        if (dwHash != pSel->GetNameHash()) {
          return false;
        }
        break;
      case FDE_CSSSelectorType::Element:
        dwHash = pSel->GetNameHash();
        if (dwHash != FDE_CSSUNIVERSALHASH && dwHash != pCache->HashTag()) {
          return false;
        }
        break;
      case FDE_CSSSelectorType::Pseudo:
        dwHash = FDE_GetCSSPseudoByEnum(ePseudoType)->dwHash;
        if (dwHash != pSel->GetNameHash()) {
          return false;
        }
        break;
      default:
        ASSERT(false);
        break;
    }
    pSel = pSel->GetNextSelector();
  }
  return !pSel && pCache;
}

void CFDE_CSSStyleSelector::ComputeStyle(
    CXFA_CSSTagProvider* pTag,
    const CFDE_CSSDeclaration** ppDeclArray,
    int32_t iDeclCount,
    CFDE_CSSComputedStyle* pDestStyle) {
  ASSERT(iDeclCount >= 0);
  ASSERT(pDestStyle);

  static const uint32_t s_dwStyleHash = FX_HashCode_GetW(L"style", true);
  static const uint32_t s_dwAlignHash = FX_HashCode_GetW(L"align", true);

  if (!pTag->empty()) {
    CFDE_CSSDeclaration* pDecl = nullptr;
    for (auto it : *pTag) {
      CFX_WideString wsAttri = it.first;
      CFX_WideString wsValue = it.second;
      uint32_t dwAttriHash = FX_HashCode_GetW(wsAttri.AsStringC(), true);
      if (dwAttriHash == s_dwStyleHash) {
        if (!pDecl)
          pDecl = new CFDE_CSSDeclaration;

        AppendInlineStyle(pDecl, wsValue.c_str(), wsValue.GetLength());
      } else if (dwAttriHash == s_dwAlignHash) {
        if (!pDecl)
          pDecl = new CFDE_CSSDeclaration;

        FDE_CSSPropertyArgs args;
        args.pStringCache = nullptr;
        args.pProperty = FDE_GetCSSPropertyByEnum(FDE_CSSProperty::TextAlign);
        pDecl->AddProperty(&args, wsValue.c_str(), wsValue.GetLength());
      }
    }

    if (pDecl) {
      CFX_ArrayTemplate<CFDE_CSSDeclaration*> decls;
      decls.SetSize(iDeclCount + 1);
      CFDE_CSSDeclaration** ppInline = decls.GetData();
      FXSYS_memcpy(ppInline, ppDeclArray,
                   iDeclCount * sizeof(CFDE_CSSDeclaration*));
      ppInline[iDeclCount++] = pDecl;
      ApplyDeclarations(true, const_cast<const CFDE_CSSDeclaration**>(ppInline),
                        iDeclCount, pDestStyle);
      ApplyDeclarations(false,
                        const_cast<const CFDE_CSSDeclaration**>(ppInline),
                        iDeclCount, pDestStyle);
      return;
    }
  }

  if (iDeclCount > 0) {
    ASSERT(ppDeclArray);

    ApplyDeclarations(true, ppDeclArray, iDeclCount, pDestStyle);
    ApplyDeclarations(false, ppDeclArray, iDeclCount, pDestStyle);
  }
}

void CFDE_CSSStyleSelector::ApplyDeclarations(
    bool bPriority,
    const CFDE_CSSDeclaration** ppDeclArray,
    int32_t iDeclCount,
    CFDE_CSSComputedStyle* pDestStyle) {
  CFDE_CSSComputedStyle* pComputedStyle = pDestStyle;

  int32_t i;
  if (bPriority) {
    CFDE_CSSValue* pLastest = nullptr;
    CFDE_CSSValue* pImportant = nullptr;
    for (i = 0; i < iDeclCount; ++i) {
      bool bImportant;
      CFDE_CSSValue* pVal =
          ppDeclArray[i]->GetProperty(FDE_CSSProperty::FontSize, bImportant);
      if (!pVal)
        continue;

      if (bImportant)
        pImportant = pVal;
      else
        pLastest = pVal;
    }
    if (pImportant) {
      ApplyProperty(FDE_CSSProperty::FontSize, pImportant, pComputedStyle);
    } else if (pLastest) {
      ApplyProperty(FDE_CSSProperty::FontSize, pLastest, pComputedStyle);
    }
  } else {
    CFX_ArrayTemplate<CFDE_CSSDeclaration*> importants;
    const CFDE_CSSDeclaration* pDecl = nullptr;

    for (i = 0; i < iDeclCount; ++i) {
      pDecl = ppDeclArray[i];
      for (auto it = pDecl->begin(); it != pDecl->end(); it++) {
        if ((*it)->eProperty == FDE_CSSProperty::FontSize)
          continue;
        if (!(*it)->bImportant) {
          ApplyProperty((*it)->eProperty, (*it)->pValue.Get(), pComputedStyle);
        } else if (importants.GetSize() == 0 ||
                   importants[importants.GetUpperBound()] != pDecl) {
          importants.Add(const_cast<CFDE_CSSDeclaration*>(pDecl));
        }
      }
    }

    iDeclCount = importants.GetSize();
    for (i = 0; i < iDeclCount; ++i) {
      pDecl = importants[i];

      for (auto it = pDecl->begin(); it != pDecl->end(); it++) {
        if ((*it)->bImportant && (*it)->eProperty != FDE_CSSProperty::FontSize)
          ApplyProperty((*it)->eProperty, (*it)->pValue.Get(), pComputedStyle);
      }
    }

    for (auto it = pDecl->custom_begin(); it != pDecl->custom_end(); it++) {
      pComputedStyle->AddCustomStyle((*it)->pwsName, (*it)->pwsValue);
    }
  }
}

void CFDE_CSSStyleSelector::AppendInlineStyle(CFDE_CSSDeclaration* pDecl,
                                              const FX_WCHAR* psz,
                                              int32_t iLen) {
  ASSERT(pDecl && psz && iLen > 0);
  auto pSyntax = pdfium::MakeUnique<CFDE_CSSSyntaxParser>();
  if (!pSyntax->Init(psz, iLen, 32, true))
    return;

  int32_t iLen2 = 0;
  const FX_WCHAR* psz2;
  FDE_CSSPropertyArgs args;
  args.pStringCache = nullptr;
  args.pProperty = nullptr;
  CFX_WideString wsName;
  while (1) {
    FDE_CSSSyntaxStatus eStatus = pSyntax->DoSyntaxParse();
    if (eStatus == FDE_CSSSyntaxStatus::PropertyName) {
      psz2 = pSyntax->GetCurrentString(iLen2);
      args.pProperty = FDE_GetCSSPropertyByName(CFX_WideStringC(psz2, iLen2));
      if (!args.pProperty)
        wsName = CFX_WideStringC(psz2, iLen2);
    } else if (eStatus == FDE_CSSSyntaxStatus::PropertyValue) {
      if (args.pProperty) {
        psz2 = pSyntax->GetCurrentString(iLen2);
        if (iLen2 > 0)
          pDecl->AddProperty(&args, psz2, iLen2);
      } else if (iLen2 > 0) {
        psz2 = pSyntax->GetCurrentString(iLen2);
        if (iLen2 > 0) {
          pDecl->AddProperty(&args, wsName.c_str(), wsName.GetLength(), psz2,
                             iLen2);
        }
      }
    } else {
      break;
    }
  }
}

void CFDE_CSSStyleSelector::ApplyProperty(
    FDE_CSSProperty eProperty,
    CFDE_CSSValue* pValue,
    CFDE_CSSComputedStyle* pComputedStyle) {
  if (pValue->GetType() != FDE_CSSPrimitiveType::List) {
    FDE_CSSPrimitiveType eType = pValue->GetType();
    switch (eProperty) {
      case FDE_CSSProperty::Display:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_NonInheritedData.m_eDisplay =
              ToDisplay(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        }
        break;
      case FDE_CSSProperty::FontSize: {
        FX_FLOAT& fFontSize = pComputedStyle->m_InheritedData.m_fFontSize;
        if (eType == FDE_CSSPrimitiveType::Number) {
          fFontSize = ToValue<CFDE_CSSNumberValue>(pValue)->Apply(fFontSize);
        } else if (eType == FDE_CSSPrimitiveType::Enum) {
          fFontSize = ToFontSize(ToValue<CFDE_CSSEnumValue>(pValue)->Value(),
                                 fFontSize);
        }
      } break;
      case FDE_CSSProperty::LineHeight:
        if (eType == FDE_CSSPrimitiveType::Number) {
          const CFDE_CSSNumberValue* v = ToValue<CFDE_CSSNumberValue>(pValue);
          if (v->Kind() == FDE_CSSNumberType::Number) {
            pComputedStyle->m_InheritedData.m_fLineHeight =
                v->Value() * pComputedStyle->m_InheritedData.m_fFontSize;
          } else {
            pComputedStyle->m_InheritedData.m_fLineHeight =
                v->Apply(pComputedStyle->m_InheritedData.m_fFontSize);
          }
        }
        break;
      case FDE_CSSProperty::TextAlign:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_eTextAlign =
              ToTextAlign(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        }
        break;
      case FDE_CSSProperty::TextIndent:
        SetLengthWithPercent(pComputedStyle->m_InheritedData.m_TextIndent,
                             eType, pValue,
                             pComputedStyle->m_InheritedData.m_fFontSize);
        break;
      case FDE_CSSProperty::FontWeight:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_wFontWeight =
              ToFontWeight(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        } else if (eType == FDE_CSSPrimitiveType::Number) {
          int32_t iValue =
              (int32_t)ToValue<CFDE_CSSNumberValue>(pValue)->Value() / 100;
          if (iValue >= 1 && iValue <= 9) {
            pComputedStyle->m_InheritedData.m_wFontWeight = iValue * 100;
          }
        }
        break;
      case FDE_CSSProperty::FontStyle:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_eFontStyle =
              ToFontStyle(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        }
        break;
      case FDE_CSSProperty::Color:
        if (eType == FDE_CSSPrimitiveType::RGB) {
          pComputedStyle->m_InheritedData.m_dwFontColor =
              ToValue<CFDE_CSSColorValue>(pValue)->Value();
        }
        break;
      case FDE_CSSProperty::MarginLeft:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_MarginWidth.left, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasMargin = true;
        }
        break;
      case FDE_CSSProperty::MarginTop:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_MarginWidth.top, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasMargin = true;
        }
        break;
      case FDE_CSSProperty::MarginRight:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_MarginWidth.right, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasMargin = true;
        }
        break;
      case FDE_CSSProperty::MarginBottom:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_MarginWidth.bottom, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasMargin = true;
        }
        break;
      case FDE_CSSProperty::PaddingLeft:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_PaddingWidth.left, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasPadding = true;
        }
        break;
      case FDE_CSSProperty::PaddingTop:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_PaddingWidth.top, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasPadding = true;
        }
        break;
      case FDE_CSSProperty::PaddingRight:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_PaddingWidth.right, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasPadding = true;
        }
        break;
      case FDE_CSSProperty::PaddingBottom:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_PaddingWidth.bottom, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasPadding = true;
        }
        break;
      case FDE_CSSProperty::BorderLeftWidth:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_BorderWidth.left, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasBorder = true;
        }
        break;
      case FDE_CSSProperty::BorderTopWidth:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_BorderWidth.top, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasBorder = true;
        }
        break;
      case FDE_CSSProperty::BorderRightWidth:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_BorderWidth.right, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasBorder = true;
        }
        break;
      case FDE_CSSProperty::BorderBottomWidth:
        if (SetLengthWithPercent(
                pComputedStyle->m_NonInheritedData.m_BorderWidth.bottom, eType,
                pValue, pComputedStyle->m_InheritedData.m_fFontSize)) {
          pComputedStyle->m_NonInheritedData.m_bHasBorder = true;
        }
        break;
      case FDE_CSSProperty::VerticalAlign:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_NonInheritedData.m_eVerticalAlign =
              ToVerticalAlign(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        } else if (eType == FDE_CSSPrimitiveType::Number) {
          pComputedStyle->m_NonInheritedData.m_eVerticalAlign =
              FDE_CSSVerticalAlign::Number;
          pComputedStyle->m_NonInheritedData.m_fVerticalAlign =
              ToValue<CFDE_CSSNumberValue>(pValue)->Apply(
                  pComputedStyle->m_InheritedData.m_fFontSize);
        }
        break;
      case FDE_CSSProperty::FontVariant:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_eFontVariant =
              ToFontVariant(ToValue<CFDE_CSSEnumValue>(pValue)->Value());
        }
        break;
      case FDE_CSSProperty::LetterSpacing:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_LetterSpacing.Set(
              FDE_CSSLengthUnit::Normal);
        } else if (eType == FDE_CSSPrimitiveType::Number) {
          if (ToValue<CFDE_CSSNumberValue>(pValue)->Kind() ==
              FDE_CSSNumberType::Percent) {
            break;
          }

          SetLengthWithPercent(pComputedStyle->m_InheritedData.m_LetterSpacing,
                               eType, pValue,
                               pComputedStyle->m_InheritedData.m_fFontSize);
        }
        break;
      case FDE_CSSProperty::WordSpacing:
        if (eType == FDE_CSSPrimitiveType::Enum) {
          pComputedStyle->m_InheritedData.m_WordSpacing.Set(
              FDE_CSSLengthUnit::Normal);
        } else if (eType == FDE_CSSPrimitiveType::Number) {
          if (ToValue<CFDE_CSSNumberValue>(pValue)->Kind() ==
              FDE_CSSNumberType::Percent) {
            break;
          }
          SetLengthWithPercent(pComputedStyle->m_InheritedData.m_WordSpacing,
                               eType, pValue,
                               pComputedStyle->m_InheritedData.m_fFontSize);
        }
        break;
      case FDE_CSSProperty::Top:
        SetLengthWithPercent(pComputedStyle->m_NonInheritedData.m_Top, eType,
                             pValue,
                             pComputedStyle->m_InheritedData.m_fFontSize);
        break;
      case FDE_CSSProperty::Bottom:
        SetLengthWithPercent(pComputedStyle->m_NonInheritedData.m_Bottom, eType,
                             pValue,
                             pComputedStyle->m_InheritedData.m_fFontSize);
        break;
      case FDE_CSSProperty::Left:
        SetLengthWithPercent(pComputedStyle->m_NonInheritedData.m_Left, eType,
                             pValue,
                             pComputedStyle->m_InheritedData.m_fFontSize);
        break;
      case FDE_CSSProperty::Right:
        SetLengthWithPercent(pComputedStyle->m_NonInheritedData.m_Right, eType,
                             pValue,
                             pComputedStyle->m_InheritedData.m_fFontSize);
        break;
      default:
        break;
    }
  } else if (pValue->GetType() == FDE_CSSPrimitiveType::List) {
    CFDE_CSSValueList* pList = ToValue<CFDE_CSSValueList>(pValue);
    int32_t iCount = pList->CountValues();
    if (iCount > 0) {
      switch (eProperty) {
        case FDE_CSSProperty::FontFamily:
          pComputedStyle->m_InheritedData.m_pFontFamily = pList;
          break;
        case FDE_CSSProperty::TextDecoration:
          pComputedStyle->m_NonInheritedData.m_dwTextDecoration =
              ToTextDecoration(pList);
          break;
        default:
          break;
      }
    }
  } else {
    ASSERT(false);
  }
}

FDE_CSSDisplay CFDE_CSSStyleSelector::ToDisplay(FDE_CSSPropertyValue eValue) {
  switch (eValue) {
    case FDE_CSSPropertyValue::Block:
      return FDE_CSSDisplay::Block;
    case FDE_CSSPropertyValue::None:
      return FDE_CSSDisplay::None;
    case FDE_CSSPropertyValue::ListItem:
      return FDE_CSSDisplay::ListItem;
    case FDE_CSSPropertyValue::InlineTable:
      return FDE_CSSDisplay::InlineTable;
    case FDE_CSSPropertyValue::InlineBlock:
      return FDE_CSSDisplay::InlineBlock;
    case FDE_CSSPropertyValue::Inline:
    default:
      return FDE_CSSDisplay::Inline;
  }
}

FDE_CSSTextAlign CFDE_CSSStyleSelector::ToTextAlign(
    FDE_CSSPropertyValue eValue) {
  switch (eValue) {
    case FDE_CSSPropertyValue::Center:
      return FDE_CSSTextAlign::Center;
    case FDE_CSSPropertyValue::Right:
      return FDE_CSSTextAlign::Right;
    case FDE_CSSPropertyValue::Justify:
      return FDE_CSSTextAlign::Justify;
    case FDE_CSSPropertyValue::Left:
    default:
      return FDE_CSSTextAlign::Left;
  }
}

uint16_t CFDE_CSSStyleSelector::ToFontWeight(FDE_CSSPropertyValue eValue) {
  switch (eValue) {
    case FDE_CSSPropertyValue::Bold:
      return 700;
    case FDE_CSSPropertyValue::Bolder:
      return 900;
    case FDE_CSSPropertyValue::Lighter:
      return 200;
    case FDE_CSSPropertyValue::Normal:
    default:
      return 400;
  }
}

FDE_CSSFontStyle CFDE_CSSStyleSelector::ToFontStyle(
    FDE_CSSPropertyValue eValue) {
  switch (eValue) {
    case FDE_CSSPropertyValue::Italic:
    case FDE_CSSPropertyValue::Oblique:
      return FDE_CSSFontStyle::Italic;
    default:
      return FDE_CSSFontStyle::Normal;
  }
}

bool CFDE_CSSStyleSelector::SetLengthWithPercent(FDE_CSSLength& width,
                                                 FDE_CSSPrimitiveType eType,
                                                 CFDE_CSSValue* pValue,
                                                 FX_FLOAT fFontSize) {
  if (eType == FDE_CSSPrimitiveType::Number) {
    const CFDE_CSSNumberValue* v = ToValue<CFDE_CSSNumberValue>(pValue);
    if (v->Kind() == FDE_CSSNumberType::Percent) {
      width.Set(FDE_CSSLengthUnit::Percent,
                ToValue<CFDE_CSSNumberValue>(pValue)->Value() / 100.0f);
      return width.NonZero();
    }

    FX_FLOAT fValue = v->Apply(fFontSize);
    width.Set(FDE_CSSLengthUnit::Point, fValue);
    return width.NonZero();
  } else if (eType == FDE_CSSPrimitiveType::Enum) {
    switch (ToValue<CFDE_CSSEnumValue>(pValue)->Value()) {
      case FDE_CSSPropertyValue::Auto:
        width.Set(FDE_CSSLengthUnit::Auto);
        return true;
      case FDE_CSSPropertyValue::None:
        width.Set(FDE_CSSLengthUnit::None);
        return true;
      case FDE_CSSPropertyValue::Thin:
        width.Set(FDE_CSSLengthUnit::Point, 2);
        return true;
      case FDE_CSSPropertyValue::Medium:
        width.Set(FDE_CSSLengthUnit::Point, 3);
        return true;
      case FDE_CSSPropertyValue::Thick:
        width.Set(FDE_CSSLengthUnit::Point, 4);
        return true;
      default:
        return false;
    }
  }
  return false;
}

FX_FLOAT CFDE_CSSStyleSelector::ToFontSize(FDE_CSSPropertyValue eValue,
                                           FX_FLOAT fCurFontSize) {
  switch (eValue) {
    case FDE_CSSPropertyValue::XxSmall:
      return m_fDefFontSize / 1.2f / 1.2f / 1.2f;
    case FDE_CSSPropertyValue::XSmall:
      return m_fDefFontSize / 1.2f / 1.2f;
    case FDE_CSSPropertyValue::Small:
      return m_fDefFontSize / 1.2f;
    case FDE_CSSPropertyValue::Medium:
      return m_fDefFontSize;
    case FDE_CSSPropertyValue::Large:
      return m_fDefFontSize * 1.2f;
    case FDE_CSSPropertyValue::XLarge:
      return m_fDefFontSize * 1.2f * 1.2f;
    case FDE_CSSPropertyValue::XxLarge:
      return m_fDefFontSize * 1.2f * 1.2f * 1.2f;
    case FDE_CSSPropertyValue::Larger:
      return fCurFontSize * 1.2f;
    case FDE_CSSPropertyValue::Smaller:
      return fCurFontSize / 1.2f;
    default:
      return fCurFontSize;
  }
}

FDE_CSSVerticalAlign CFDE_CSSStyleSelector::ToVerticalAlign(
    FDE_CSSPropertyValue eValue) {
  switch (eValue) {
    case FDE_CSSPropertyValue::Middle:
      return FDE_CSSVerticalAlign::Middle;
    case FDE_CSSPropertyValue::Bottom:
      return FDE_CSSVerticalAlign::Bottom;
    case FDE_CSSPropertyValue::Super:
      return FDE_CSSVerticalAlign::Super;
    case FDE_CSSPropertyValue::Sub:
      return FDE_CSSVerticalAlign::Sub;
    case FDE_CSSPropertyValue::Top:
      return FDE_CSSVerticalAlign::Top;
    case FDE_CSSPropertyValue::TextTop:
      return FDE_CSSVerticalAlign::TextTop;
    case FDE_CSSPropertyValue::TextBottom:
      return FDE_CSSVerticalAlign::TextBottom;
    case FDE_CSSPropertyValue::Baseline:
    default:
      return FDE_CSSVerticalAlign::Baseline;
  }
}

uint32_t CFDE_CSSStyleSelector::ToTextDecoration(CFDE_CSSValueList* pValue) {
  uint32_t dwDecoration = 0;
  for (int32_t i = pValue->CountValues() - 1; i >= 0; --i) {
    CFDE_CSSValue* pVal = pValue->GetValue(i);
    if (pVal->GetType() != FDE_CSSPrimitiveType::Enum)
      continue;

    switch (ToValue<CFDE_CSSEnumValue>(pVal)->Value()) {
      case FDE_CSSPropertyValue::Underline:
        dwDecoration |= FDE_CSSTEXTDECORATION_Underline;
        break;
      case FDE_CSSPropertyValue::LineThrough:
        dwDecoration |= FDE_CSSTEXTDECORATION_LineThrough;
        break;
      case FDE_CSSPropertyValue::Overline:
        dwDecoration |= FDE_CSSTEXTDECORATION_Overline;
        break;
      case FDE_CSSPropertyValue::Blink:
        dwDecoration |= FDE_CSSTEXTDECORATION_Blink;
        break;
      case FDE_CSSPropertyValue::Double:
        dwDecoration |= FDE_CSSTEXTDECORATION_Double;
        break;
      default:
        break;
    }
  }
  return dwDecoration;
}

FDE_CSSFontVariant CFDE_CSSStyleSelector::ToFontVariant(
    FDE_CSSPropertyValue eValue) {
  return eValue == FDE_CSSPropertyValue::SmallCaps
             ? FDE_CSSFontVariant::SmallCaps
             : FDE_CSSFontVariant::Normal;
}