| // Copyright 2017 The PDFium Authors |
| // 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_cssvaluelistparser.h" |
| |
| #include "core/fxcrt/check.h" |
| #include "core/fxcrt/check_op.h" |
| #include "core/fxcrt/fx_extension.h" |
| #include "core/fxcrt/fx_system.h" |
| |
| CFX_CSSValueListParser::CFX_CSSValueListParser(WideStringView list, |
| wchar_t separator) |
| : m_Separator(separator), |
| m_pCur(list.unterminated_c_str()), |
| m_pEnd(list.unterminated_c_str() + list.GetLength()) { |
| DCHECK_NE(m_pCur, m_pEnd); |
| } |
| |
| std::optional<CFX_CSSValueListParser::Result> |
| CFX_CSSValueListParser::NextValue() { |
| while (m_pCur < m_pEnd && (*m_pCur <= ' ' || *m_pCur == m_Separator)) { |
| ++m_pCur; |
| } |
| if (m_pCur >= m_pEnd) { |
| return std::nullopt; |
| } |
| auto eType = CFX_CSSValue::PrimitiveType::kUnknown; |
| const wchar_t* pStart = m_pCur; |
| size_t nLength = 0; |
| wchar_t wch = *m_pCur; |
| if (wch == '#') { |
| nLength = SkipToChar(' '); |
| if (nLength == 4 || nLength == 7) { |
| eType = CFX_CSSValue::PrimitiveType::kRGB; |
| } |
| } else if (FXSYS_IsDecimalDigit(wch) || wch == '.' || wch == '-' || |
| wch == '+') { |
| while (m_pCur < m_pEnd && (*m_pCur > ' ' && *m_pCur != m_Separator)) { |
| ++m_pCur; |
| } |
| nLength = m_pCur - pStart; |
| eType = CFX_CSSValue::PrimitiveType::kNumber; |
| } else if (wch == '\"' || wch == '\'') { |
| ++pStart; |
| ++m_pCur; |
| nLength = SkipToChar(wch); |
| ++m_pCur; |
| eType = CFX_CSSValue::PrimitiveType::kString; |
| } else if (m_pEnd - m_pCur > 5 && m_pCur[3] == '(') { |
| if (FXSYS_wcsnicmp(L"rgb", m_pCur, 3) == 0) { |
| nLength = SkipToChar(')') + 1; |
| ++m_pCur; |
| eType = CFX_CSSValue::PrimitiveType::kRGB; |
| } |
| } else { |
| nLength = SkipToCharMatchingParens(m_Separator); |
| eType = CFX_CSSValue::PrimitiveType::kString; |
| } |
| if (m_pCur <= m_pEnd && nLength > 0) { |
| return Result{eType, WideStringView(pStart, nLength)}; |
| } |
| return std::nullopt; |
| } |
| |
| size_t CFX_CSSValueListParser::SkipToChar(wchar_t wch) { |
| const wchar_t* pStart = m_pCur; |
| while (m_pCur < m_pEnd && *m_pCur != wch) { |
| m_pCur++; |
| } |
| return m_pCur - pStart; |
| } |
| |
| size_t CFX_CSSValueListParser::SkipToCharMatchingParens(wchar_t wch) { |
| const wchar_t* pStart = m_pCur; |
| int64_t bracketCount = 0; |
| while (m_pCur < m_pEnd && *m_pCur != wch) { |
| if (*m_pCur <= ' ') |
| break; |
| if (*m_pCur == '(') |
| bracketCount++; |
| else if (*m_pCur == ')') |
| bracketCount--; |
| m_pCur++; |
| } |
| while (bracketCount > 0 && m_pCur < m_pEnd) { |
| if (*m_pCur == ')') |
| bracketCount--; |
| m_pCur++; |
| } |
| return m_pCur - pStart; |
| } |