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// Copyright 2017 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_cssselector.h"
#include <utility>
#include "third_party/base/ptr_util.h"
namespace {
bool IsCSSChar(FX_WCHAR wch) {
return (wch >= 'a' && wch <= 'z') || (wch >= 'A' && wch <= 'Z');
}
int32_t GetCSSPseudoLen(const FX_WCHAR* psz, const FX_WCHAR* pEnd) {
ASSERT(*psz == ':');
const FX_WCHAR* pStart = psz;
while (psz < pEnd) {
FX_WCHAR wch = *psz;
if (IsCSSChar(wch) || wch == ':')
++psz;
else
break;
}
return psz - pStart;
}
int32_t GetCSSNameLen(const FX_WCHAR* psz, const FX_WCHAR* pEnd) {
const FX_WCHAR* pStart = psz;
while (psz < pEnd) {
FX_WCHAR wch = *psz;
if (IsCSSChar(wch) || (wch >= '0' && wch <= '9') || wch == '_' ||
wch == '-') {
++psz;
} else {
break;
}
}
return psz - pStart;
}
} // namespace
CFDE_CSSSelector::CFDE_CSSSelector(FDE_CSSSelectorType eType,
const FX_WCHAR* psz,
int32_t iLen,
bool bIgnoreCase)
: m_eType(eType),
m_dwHash(FX_HashCode_GetW(CFX_WideStringC(psz, iLen), bIgnoreCase)) {}
CFDE_CSSSelector::~CFDE_CSSSelector() {}
FDE_CSSSelectorType CFDE_CSSSelector::GetType() const {
return m_eType;
}
uint32_t CFDE_CSSSelector::GetNameHash() const {
return m_dwHash;
}
CFDE_CSSSelector* CFDE_CSSSelector::GetNextSelector() const {
return m_pNext.get();
}
std::unique_ptr<CFDE_CSSSelector> CFDE_CSSSelector::ReleaseNextSelector() {
return std::move(m_pNext);
}
std::unique_ptr<CFDE_CSSSelector> CFDE_CSSSelector::FromString(
const FX_WCHAR* psz,
int32_t iLen) {
ASSERT(psz && iLen > 0);
const FX_WCHAR* pStart = psz;
const FX_WCHAR* pEnd = psz + iLen;
for (; psz < pEnd; ++psz) {
switch (*psz) {
case '>':
case '[':
case '+':
return nullptr;
}
}
std::unique_ptr<CFDE_CSSSelector> pFirst = nullptr;
CFDE_CSSSelector* pLast = nullptr;
std::unique_ptr<CFDE_CSSSelector> pPseudoFirst = nullptr;
CFDE_CSSSelector* pPseudoLast = nullptr;
for (psz = pStart; psz < pEnd;) {
FX_WCHAR wch = *psz;
if (wch == '.' || wch == '#') {
if (psz == pStart || psz[-1] == ' ') {
auto p = pdfium::MakeUnique<CFDE_CSSSelector>(
FDE_CSSSelectorType::Element, L"*", 1, true);
if (pFirst) {
pFirst->SetType(FDE_CSSSelectorType::Descendant);
p->SetNext(std::move(pFirst));
}
pFirst = std::move(p);
pLast = pFirst.get();
}
ASSERT(pLast);
int32_t iNameLen = GetCSSNameLen(++psz, pEnd);
if (iNameLen == 0)
return nullptr;
FDE_CSSSelectorType eType =
wch == '.' ? FDE_CSSSelectorType::Class : FDE_CSSSelectorType::ID;
auto p =
pdfium::MakeUnique<CFDE_CSSSelector>(eType, psz, iNameLen, false);
p->SetNext(pLast->ReleaseNextSelector());
pLast->SetNext(std::move(p));
pLast = pLast->GetNextSelector();
psz += iNameLen;
} else if (IsCSSChar(wch) || wch == '*') {
int32_t iNameLen = wch == '*' ? 1 : GetCSSNameLen(psz, pEnd);
if (iNameLen == 0)
return nullptr;
auto p = pdfium::MakeUnique<CFDE_CSSSelector>(
FDE_CSSSelectorType::Element, psz, iNameLen, true);
if (pFirst) {
pFirst->SetType(FDE_CSSSelectorType::Descendant);
p->SetNext(std::move(pFirst));
}
pFirst = std::move(p);
pLast = pFirst.get();
psz += iNameLen;
} else if (wch == ':') {
int32_t iNameLen = GetCSSPseudoLen(psz, pEnd);
if (iNameLen == 0)
return nullptr;
auto p = pdfium::MakeUnique<CFDE_CSSSelector>(FDE_CSSSelectorType::Pseudo,
psz, iNameLen, true);
CFDE_CSSSelector* ptr = p.get();
if (pPseudoFirst)
pPseudoLast->SetNext(std::move(p));
else
pPseudoFirst = std::move(p);
pPseudoLast = ptr;
psz += iNameLen;
} else if (wch == ' ') {
psz++;
} else {
return nullptr;
}
}
if (!pPseudoFirst)
return pFirst;
pPseudoLast->SetNext(std::move(pFirst));
return pPseudoFirst;
}
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