| // Copyright 2014 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_csssyntaxparser.h" |
| |
| #include "core/fxcrt/css/cfx_cssdata.h" |
| #include "core/fxcrt/css/cfx_cssdeclaration.h" |
| #include "core/fxcrt/fx_codepage.h" |
| #include "core/fxcrt/fx_extension.h" |
| |
| namespace { |
| |
| bool IsSelectorStart(wchar_t wch) { |
| return wch == '.' || wch == '#' || wch == '*' || |
| (isascii(wch) && isalpha(wch)); |
| } |
| |
| } // namespace |
| |
| CFX_CSSSyntaxParser::CFX_CSSSyntaxParser(WideStringView str) : m_Input(str) {} |
| |
| CFX_CSSSyntaxParser::~CFX_CSSSyntaxParser() = default; |
| |
| void CFX_CSSSyntaxParser::SetParseOnlyDeclarations() { |
| m_eMode = Mode::kPropertyName; |
| } |
| |
| CFX_CSSSyntaxParser::Status CFX_CSSSyntaxParser::DoSyntaxParse() { |
| m_Output.Clear(); |
| if (m_bHasError) |
| return Status::kError; |
| |
| while (!m_Input.IsEOF()) { |
| wchar_t wch = m_Input.GetChar(); |
| switch (m_eMode) { |
| case Mode::kRuleSet: |
| switch (wch) { |
| case '}': |
| m_bHasError = true; |
| return Status::kError; |
| case '/': |
| if (m_Input.GetNextChar() == '*') { |
| SaveMode(Mode::kRuleSet); |
| m_eMode = Mode::kComment; |
| break; |
| } |
| [[fallthrough]]; |
| default: |
| if (wch <= ' ') { |
| m_Input.MoveNext(); |
| } else if (IsSelectorStart(wch)) { |
| m_eMode = Mode::kSelector; |
| return Status::kStyleRule; |
| } else { |
| m_bHasError = true; |
| return Status::kError; |
| } |
| break; |
| } |
| break; |
| case Mode::kSelector: |
| switch (wch) { |
| case ',': |
| m_Input.MoveNext(); |
| if (!m_Output.IsEmpty()) |
| return Status::kSelector; |
| break; |
| case '{': |
| if (!m_Output.IsEmpty()) |
| return Status::kSelector; |
| m_Input.MoveNext(); |
| SaveMode(Mode::kRuleSet); // Back to validate ruleset again. |
| m_eMode = Mode::kPropertyName; |
| return Status::kDeclOpen; |
| case '/': |
| if (m_Input.GetNextChar() == '*') { |
| SaveMode(Mode::kSelector); |
| m_eMode = Mode::kComment; |
| if (!m_Output.IsEmpty()) |
| return Status::kSelector; |
| break; |
| } |
| [[fallthrough]]; |
| default: |
| m_Output.AppendCharIfNotLeadingBlank(wch); |
| m_Input.MoveNext(); |
| break; |
| } |
| break; |
| case Mode::kPropertyName: |
| switch (wch) { |
| case ':': |
| m_Input.MoveNext(); |
| m_eMode = Mode::kPropertyValue; |
| return Status::kPropertyName; |
| case '}': |
| m_Input.MoveNext(); |
| if (!RestoreMode()) |
| return Status::kError; |
| |
| return Status::kDeclClose; |
| case '/': |
| if (m_Input.GetNextChar() == '*') { |
| SaveMode(Mode::kPropertyName); |
| m_eMode = Mode::kComment; |
| if (!m_Output.IsEmpty()) |
| return Status::kPropertyName; |
| break; |
| } |
| [[fallthrough]]; |
| default: |
| m_Output.AppendCharIfNotLeadingBlank(wch); |
| m_Input.MoveNext(); |
| break; |
| } |
| break; |
| case Mode::kPropertyValue: |
| switch (wch) { |
| case ';': |
| m_Input.MoveNext(); |
| [[fallthrough]]; |
| case '}': |
| m_eMode = Mode::kPropertyName; |
| return Status::kPropertyValue; |
| case '/': |
| if (m_Input.GetNextChar() == '*') { |
| SaveMode(Mode::kPropertyValue); |
| m_eMode = Mode::kComment; |
| if (!m_Output.IsEmpty()) |
| return Status::kPropertyValue; |
| break; |
| } |
| [[fallthrough]]; |
| default: |
| m_Output.AppendCharIfNotLeadingBlank(wch); |
| m_Input.MoveNext(); |
| break; |
| } |
| break; |
| case Mode::kComment: |
| if (wch == '*' && m_Input.GetNextChar() == '/') { |
| if (!RestoreMode()) |
| return Status::kError; |
| m_Input.MoveNext(); |
| } |
| m_Input.MoveNext(); |
| break; |
| } |
| } |
| if (m_eMode == Mode::kPropertyValue && !m_Output.IsEmpty()) |
| return Status::kPropertyValue; |
| |
| return Status::kEOS; |
| } |
| |
| void CFX_CSSSyntaxParser::SaveMode(Mode mode) { |
| m_ModeStack.push(mode); |
| } |
| |
| bool CFX_CSSSyntaxParser::RestoreMode() { |
| if (m_ModeStack.empty()) { |
| m_bHasError = true; |
| return false; |
| } |
| m_eMode = m_ModeStack.top(); |
| m_ModeStack.pop(); |
| return true; |
| } |
| |
| WideStringView CFX_CSSSyntaxParser::GetCurrentString() const { |
| return m_Output.GetTrailingBlankTrimmedString(); |
| } |