kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 1 | // Copyright 2014 The PDFium Authors |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| 6 | |
| 7 | #include "core/fxcrt/css/cfx_csssyntaxparser.h" |
| 8 | |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 9 | #include "core/fxcrt/css/cfx_cssdata.h" |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 10 | #include "core/fxcrt/css/cfx_cssdeclaration.h" |
| 11 | #include "core/fxcrt/fx_codepage.h" |
| 12 | #include "core/fxcrt/fx_extension.h" |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 13 | #include "third_party/base/notreached.h" |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 14 | |
| 15 | namespace { |
| 16 | |
| 17 | bool IsSelectorStart(wchar_t wch) { |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 18 | return wch == '.' || wch == '#' || wch == '*' || |
| 19 | (isascii(wch) && isalpha(wch)); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 20 | } |
| 21 | |
| 22 | } // namespace |
| 23 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 24 | CFX_CSSSyntaxParser::CFX_CSSSyntaxParser(WideStringView str) : m_Input(str) {} |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 25 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 26 | CFX_CSSSyntaxParser::~CFX_CSSSyntaxParser() = default; |
Haibo Huang | 49cc930 | 2020-04-27 16:14:24 -0700 | [diff] [blame] | 27 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 28 | void CFX_CSSSyntaxParser::SetParseOnlyDeclarations() { |
| 29 | m_eMode = Mode::kPropertyName; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 30 | } |
| 31 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 32 | CFX_CSSSyntaxParser::Status CFX_CSSSyntaxParser::DoSyntaxParse() { |
| 33 | m_Output.Clear(); |
| 34 | if (m_bHasError) |
| 35 | return Status::kError; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 36 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 37 | while (!m_Input.IsEOF()) { |
| 38 | wchar_t wch = m_Input.GetChar(); |
| 39 | switch (m_eMode) { |
| 40 | case Mode::kRuleSet: |
| 41 | switch (wch) { |
| 42 | case '}': |
| 43 | m_bHasError = true; |
| 44 | return Status::kError; |
| 45 | case '/': |
| 46 | if (m_Input.GetNextChar() == '*') { |
| 47 | SaveMode(Mode::kRuleSet); |
| 48 | m_eMode = Mode::kComment; |
| 49 | break; |
| 50 | } |
| 51 | [[fallthrough]]; |
| 52 | default: |
| 53 | if (wch <= ' ') { |
| 54 | m_Input.MoveNext(); |
| 55 | } else if (IsSelectorStart(wch)) { |
| 56 | m_eMode = Mode::kSelector; |
| 57 | return Status::kStyleRule; |
| 58 | } else { |
| 59 | m_bHasError = true; |
| 60 | return Status::kError; |
| 61 | } |
| 62 | break; |
| 63 | } |
| 64 | break; |
| 65 | case Mode::kSelector: |
| 66 | switch (wch) { |
| 67 | case ',': |
| 68 | m_Input.MoveNext(); |
| 69 | if (!m_Output.IsEmpty()) |
| 70 | return Status::kSelector; |
| 71 | break; |
| 72 | case '{': |
| 73 | if (!m_Output.IsEmpty()) |
| 74 | return Status::kSelector; |
| 75 | m_Input.MoveNext(); |
| 76 | SaveMode(Mode::kRuleSet); // Back to validate ruleset again. |
| 77 | m_eMode = Mode::kPropertyName; |
| 78 | return Status::kDeclOpen; |
| 79 | case '/': |
| 80 | if (m_Input.GetNextChar() == '*') { |
| 81 | SaveMode(Mode::kSelector); |
| 82 | m_eMode = Mode::kComment; |
| 83 | if (!m_Output.IsEmpty()) |
| 84 | return Status::kSelector; |
| 85 | break; |
| 86 | } |
| 87 | [[fallthrough]]; |
| 88 | default: |
| 89 | m_Output.AppendCharIfNotLeadingBlank(wch); |
| 90 | m_Input.MoveNext(); |
| 91 | break; |
| 92 | } |
| 93 | break; |
| 94 | case Mode::kPropertyName: |
| 95 | switch (wch) { |
| 96 | case ':': |
| 97 | m_Input.MoveNext(); |
| 98 | m_eMode = Mode::kPropertyValue; |
| 99 | return Status::kPropertyName; |
| 100 | case '}': |
| 101 | m_Input.MoveNext(); |
| 102 | if (!RestoreMode()) |
| 103 | return Status::kError; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 104 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 105 | return Status::kDeclClose; |
| 106 | case '/': |
| 107 | if (m_Input.GetNextChar() == '*') { |
| 108 | SaveMode(Mode::kPropertyName); |
| 109 | m_eMode = Mode::kComment; |
| 110 | if (!m_Output.IsEmpty()) |
| 111 | return Status::kPropertyName; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 112 | break; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 113 | } |
| 114 | [[fallthrough]]; |
| 115 | default: |
| 116 | m_Output.AppendCharIfNotLeadingBlank(wch); |
| 117 | m_Input.MoveNext(); |
| 118 | break; |
| 119 | } |
| 120 | break; |
| 121 | case Mode::kPropertyValue: |
| 122 | switch (wch) { |
| 123 | case ';': |
| 124 | m_Input.MoveNext(); |
| 125 | [[fallthrough]]; |
| 126 | case '}': |
| 127 | m_eMode = Mode::kPropertyName; |
| 128 | return Status::kPropertyValue; |
| 129 | case '/': |
| 130 | if (m_Input.GetNextChar() == '*') { |
| 131 | SaveMode(Mode::kPropertyValue); |
| 132 | m_eMode = Mode::kComment; |
| 133 | if (!m_Output.IsEmpty()) |
| 134 | return Status::kPropertyValue; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 135 | break; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 136 | } |
| 137 | [[fallthrough]]; |
| 138 | default: |
| 139 | m_Output.AppendCharIfNotLeadingBlank(wch); |
| 140 | m_Input.MoveNext(); |
| 141 | break; |
| 142 | } |
| 143 | break; |
| 144 | case Mode::kComment: |
| 145 | if (wch == '*' && m_Input.GetNextChar() == '/') { |
| 146 | if (!RestoreMode()) |
| 147 | return Status::kError; |
| 148 | m_Input.MoveNext(); |
| 149 | } |
| 150 | m_Input.MoveNext(); |
| 151 | break; |
| 152 | default: |
| 153 | NOTREACHED(); |
| 154 | break; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 155 | } |
| 156 | } |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 157 | if (m_eMode == Mode::kPropertyValue && !m_Output.IsEmpty()) |
| 158 | return Status::kPropertyValue; |
| 159 | |
| 160 | return Status::kEOS; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 161 | } |
| 162 | |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 163 | void CFX_CSSSyntaxParser::SaveMode(Mode mode) { |
| 164 | m_ModeStack.push(mode); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | bool CFX_CSSSyntaxParser::RestoreMode() { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 168 | if (m_ModeStack.empty()) { |
| 169 | m_bHasError = true; |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 170 | return false; |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 171 | } |
| 172 | m_eMode = m_ModeStack.top(); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 173 | m_ModeStack.pop(); |
| 174 | return true; |
| 175 | } |
| 176 | |
| 177 | WideStringView CFX_CSSSyntaxParser::GetCurrentString() const { |
kumarashishg | 826308d | 2023-06-23 13:21:22 +0000 | [diff] [blame] | 178 | return m_Output.GetTrailingBlankTrimmedString(); |
Philip P. Moltmann | d904c1e | 2018-03-19 09:26:45 -0700 | [diff] [blame] | 179 | } |