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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(wchar_t wch) {
return (wch >= 'a' && wch <= 'z') || (wch >= 'A' && wch <= 'Z');
}
int32_t GetCSSNameLen(const wchar_t* psz, const wchar_t* pEnd) {
const wchar_t* pStart = psz;
while (psz < pEnd) {
wchar_t 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 wchar_t* 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();
}
// static.
std::unique_ptr<CFDE_CSSSelector> CFDE_CSSSelector::FromString(
const CFX_WideStringC& str) {
ASSERT(!str.IsEmpty());
const wchar_t* psz = str.c_str();
const wchar_t* pStart = psz;
const wchar_t* pEnd = psz + str.GetLength();
for (; psz < pEnd; ++psz) {
switch (*psz) {
case '>':
case '[':
case '+':
return nullptr;
}
}
std::unique_ptr<CFDE_CSSSelector> pFirst = nullptr;
for (psz = pStart; psz < pEnd;) {
wchar_t wch = *psz;
if (IsCSSChar(wch) || wch == '*') {
int32_t iNameLen = wch == '*' ? 1 : GetCSSNameLen(psz, pEnd);
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);
psz += iNameLen;
} else if (wch == ' ') {
psz++;
} else {
return nullptr;
}
}
return pFirst;
}
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