| // 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 "core/fxcrt/css/cfx_cssselector.h" |
| |
| #include <utility> |
| |
| #include "core/fxcrt/fx_extension.h" |
| #include "third_party/base/ptr_util.h" |
| |
| namespace { |
| |
| int32_t GetCSSNameLen(const wchar_t* psz, const wchar_t* pEnd) { |
| const wchar_t* pStart = psz; |
| while (psz < pEnd) { |
| if (!isascii(*psz) || (!isalnum(*psz) && *psz != '_' && *psz != '-')) { |
| break; |
| } |
| ++psz; |
| } |
| return psz - pStart; |
| } |
| |
| } // namespace |
| |
| CFX_CSSSelector::CFX_CSSSelector(CFX_CSSSelectorType eType, |
| const wchar_t* psz, |
| int32_t iLen, |
| bool bIgnoreCase) |
| : m_eType(eType), |
| m_dwHash(FX_HashCode_GetW(WideStringView(psz, iLen), bIgnoreCase)) {} |
| |
| CFX_CSSSelector::~CFX_CSSSelector() {} |
| |
| CFX_CSSSelectorType CFX_CSSSelector::GetType() const { |
| return m_eType; |
| } |
| |
| uint32_t CFX_CSSSelector::GetNameHash() const { |
| return m_dwHash; |
| } |
| |
| CFX_CSSSelector* CFX_CSSSelector::GetNextSelector() const { |
| return m_pNext.get(); |
| } |
| |
| // static. |
| std::unique_ptr<CFX_CSSSelector> CFX_CSSSelector::FromString( |
| const WideStringView& str) { |
| ASSERT(!str.IsEmpty()); |
| |
| const wchar_t* psz = str.unterminated_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<CFX_CSSSelector> pFirst = nullptr; |
| for (psz = pStart; psz < pEnd;) { |
| wchar_t wch = *psz; |
| if ((isascii(wch) && isalpha(wch)) || wch == '*') { |
| int32_t iNameLen = wch == '*' ? 1 : GetCSSNameLen(psz, pEnd); |
| auto p = pdfium::MakeUnique<CFX_CSSSelector>(CFX_CSSSelectorType::Element, |
| psz, iNameLen, true); |
| if (pFirst) { |
| pFirst->SetType(CFX_CSSSelectorType::Descendant); |
| p->SetNext(std::move(pFirst)); |
| } |
| pFirst = std::move(p); |
| psz += iNameLen; |
| } else if (wch == ' ') { |
| psz++; |
| } else { |
| return nullptr; |
| } |
| } |
| return pFirst; |
| } |