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// Copyright 2016 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_cssrulecollection.h"
#include <algorithm>
#include <map>
#include <memory>
#include "xfa/fde/css/cfde_cssdeclaration.h"
#include "xfa/fde/css/cfde_cssselector.h"
#include "xfa/fde/css/cfde_cssstylerule.h"
#include "xfa/fde/css/cfde_cssstylesheet.h"
#include "xfa/fde/css/cfde_csssyntaxparser.h"
#include "xfa/fde/css/cfde_csstagcache.h"
#define FDE_CSSUNIVERSALHASH ('*')
void CFDE_CSSRuleCollection::Clear() {
m_IDRules.clear();
m_TagRules.clear();
m_ClassRules.clear();
m_pUniversalRules = nullptr;
m_iSelectors = 0;
}
CFDE_CSSRuleCollection::CFDE_CSSRuleCollection()
: m_pUniversalRules(nullptr), m_pPseudoRules(nullptr), m_iSelectors(0) {}
CFDE_CSSRuleCollection::~CFDE_CSSRuleCollection() {
Clear();
}
void CFDE_CSSRuleCollection::AddRulesFrom(const CFDE_CSSStyleSheet* sheet,
CFGAS_FontMgr* pFontMgr) {
int32_t iRules = sheet->CountRules();
for (int32_t j = 0; j < iRules; j++)
AddRulesFrom(sheet, sheet->GetRule(j), pFontMgr);
}
void CFDE_CSSRuleCollection::AddRulesFrom(const CFDE_CSSStyleSheet* pStyleSheet,
CFDE_CSSStyleRule* pStyleRule,
CFGAS_FontMgr* pFontMgr) {
CFDE_CSSDeclaration* pDeclaration = pStyleRule->GetDeclaration();
int32_t iSelectors = pStyleRule->CountSelectorLists();
for (int32_t i = 0; i < iSelectors; ++i) {
CFDE_CSSSelector* pSelector = pStyleRule->GetSelectorList(i);
if (pSelector->GetType() == FDE_CSSSelectorType::Pseudo) {
Data* pData = NewRuleData(pSelector, pDeclaration);
AddRuleTo(&m_pPseudoRules, pData);
continue;
}
if (pSelector->GetNameHash() != FDE_CSSUNIVERSALHASH) {
AddRuleTo(&m_TagRules, pSelector->GetNameHash(), pSelector, pDeclaration);
continue;
}
CFDE_CSSSelector* pNext = pSelector->GetNextSelector();
if (!pNext) {
Data* pData = NewRuleData(pSelector, pDeclaration);
AddRuleTo(&m_pUniversalRules, pData);
continue;
}
switch (pNext->GetType()) {
case FDE_CSSSelectorType::ID:
AddRuleTo(&m_IDRules, pNext->GetNameHash(), pSelector, pDeclaration);
break;
case FDE_CSSSelectorType::Class:
AddRuleTo(&m_ClassRules, pNext->GetNameHash(), pSelector, pDeclaration);
break;
case FDE_CSSSelectorType::Descendant:
case FDE_CSSSelectorType::Element:
AddRuleTo(&m_pUniversalRules, NewRuleData(pSelector, pDeclaration));
break;
default:
ASSERT(false);
break;
}
}
}
void CFDE_CSSRuleCollection::AddRuleTo(std::map<uint32_t, Data*>* pMap,
uint32_t dwKey,
CFDE_CSSSelector* pSel,
CFDE_CSSDeclaration* pDecl) {
Data* pData = NewRuleData(pSel, pDecl);
Data* pList = (*pMap)[dwKey];
if (!pList) {
(*pMap)[dwKey] = pData;
} else if (AddRuleTo(&pList, pData)) {
(*pMap)[dwKey] = pList;
}
}
bool CFDE_CSSRuleCollection::AddRuleTo(Data** pList, Data* pData) {
if (*pList) {
pData->pNext = (*pList)->pNext;
(*pList)->pNext = pData;
return false;
}
*pList = pData;
return true;
}
CFDE_CSSRuleCollection::Data* CFDE_CSSRuleCollection::NewRuleData(
CFDE_CSSSelector* pSel,
CFDE_CSSDeclaration* pDecl) {
return new Data(pSel, pDecl, ++m_iSelectors);
}
CFDE_CSSRuleCollection::Data::Data(CFDE_CSSSelector* pSel,
CFDE_CSSDeclaration* pDecl,
uint32_t dwPos)
: pSelector(pSel), pDeclaration(pDecl), dwPriority(dwPos), pNext(nullptr) {
static const uint32_t s_Specific[5] = {0x00010000, 0x00010000, 0x00100000,
0x00100000, 0x01000000};
for (; pSel; pSel = pSel->GetNextSelector()) {
FDE_CSSSelectorType eType = pSel->GetType();
if (eType > FDE_CSSSelectorType::Descendant ||
pSel->GetNameHash() != FDE_CSSUNIVERSALHASH) {
dwPriority += s_Specific[static_cast<int>(eType)];
}
}
}
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