1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #include "mozilla/dom/CSSLexer.h"
7 #include "js/Value.h"
8 #include "mozilla/dom/CSSLexerBinding.h"
9 #include "mozilla/dom/ToJSValue.h"
10
11 namespace mozilla {
12 namespace dom {
13
14 // Ensure that constants are consistent.
15
16 #define CHECK(X, Y) \
17 static_assert(static_cast<int>(X) == static_cast<int>(Y), \
18 "nsCSSToken and CSSTokenType should have identical values")
19
20 CHECK(eCSSToken_Whitespace, CSSTokenType::Whitespace);
21 CHECK(eCSSToken_Comment, CSSTokenType::Comment);
22 CHECK(eCSSToken_Ident, CSSTokenType::Ident);
23 CHECK(eCSSToken_Function, CSSTokenType::Function);
24 CHECK(eCSSToken_AtKeyword, CSSTokenType::At);
25 CHECK(eCSSToken_ID, CSSTokenType::Id);
26 CHECK(eCSSToken_Hash, CSSTokenType::Hash);
27 CHECK(eCSSToken_Number, CSSTokenType::Number);
28 CHECK(eCSSToken_Dimension, CSSTokenType::Dimension);
29 CHECK(eCSSToken_Percentage, CSSTokenType::Percentage);
30 CHECK(eCSSToken_String, CSSTokenType::String);
31 CHECK(eCSSToken_Bad_String, CSSTokenType::Bad_string);
32 CHECK(eCSSToken_URL, CSSTokenType::Url);
33 CHECK(eCSSToken_Bad_URL, CSSTokenType::Bad_url);
34 CHECK(eCSSToken_Symbol, CSSTokenType::Symbol);
35 CHECK(eCSSToken_Includes, CSSTokenType::Includes);
36 CHECK(eCSSToken_Dashmatch, CSSTokenType::Dashmatch);
37 CHECK(eCSSToken_Beginsmatch, CSSTokenType::Beginsmatch);
38 CHECK(eCSSToken_Endsmatch, CSSTokenType::Endsmatch);
39 CHECK(eCSSToken_Containsmatch, CSSTokenType::Containsmatch);
40 CHECK(eCSSToken_URange, CSSTokenType::Urange);
41 CHECK(eCSSToken_HTMLComment, CSSTokenType::Htmlcomment);
42
43 #undef CHECK
44
CSSLexer(const nsAString & aText)45 CSSLexer::CSSLexer(const nsAString& aText)
46 : mInput(aText)
47 , mScanner(mInput, 1)
48 {
49 }
50
~CSSLexer()51 CSSLexer::~CSSLexer()
52 {
53 }
54
55 bool
WrapObject(JSContext * aCx,JS::Handle<JSObject * > aGivenProto,JS::MutableHandle<JSObject * > aReflector)56 CSSLexer::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
57 JS::MutableHandle<JSObject*> aReflector)
58 {
59 return CSSLexerBinding::Wrap(aCx, this, aGivenProto, aReflector);
60 }
61
62 uint32_t
LineNumber()63 CSSLexer::LineNumber()
64 {
65 // The scanner uses 1-based line numbers, but our callers expect
66 // 0-based.
67 return mScanner.GetLineNumber() - 1;
68 }
69
70 uint32_t
ColumnNumber()71 CSSLexer::ColumnNumber()
72 {
73 return mScanner.GetColumnNumber();
74 }
75
76 void
PerformEOFFixup(const nsAString & aInputString,bool aPreserveBackslash,nsAString & aResult)77 CSSLexer::PerformEOFFixup(const nsAString& aInputString, bool aPreserveBackslash,
78 nsAString& aResult)
79 {
80 aResult.Append(aInputString);
81 uint32_t eofChars = mScanner.GetEOFCharacters();
82
83 if (aPreserveBackslash &&
84 (eofChars & (nsCSSScanner::eEOFCharacters_DropBackslash |
85 nsCSSScanner::eEOFCharacters_ReplacementChar)) != 0) {
86 eofChars &= ~(nsCSSScanner::eEOFCharacters_DropBackslash |
87 nsCSSScanner::eEOFCharacters_ReplacementChar);
88 aResult.Append('\\');
89 }
90
91 if ((eofChars & nsCSSScanner::eEOFCharacters_DropBackslash) != 0 &&
92 aResult.Length() > 0 && aResult.Last() == '\\') {
93 aResult.Truncate(aResult.Length() - 1);
94 }
95
96 nsCSSScanner::AppendImpliedEOFCharacters(nsCSSScanner::EOFCharacters(eofChars),
97 aResult);
98 }
99
100 void
NextToken(Nullable<CSSToken> & aResult)101 CSSLexer::NextToken(Nullable<CSSToken>& aResult)
102 {
103 nsCSSToken token;
104 if (!mScanner.Next(token, eCSSScannerExclude_None)) {
105 return;
106 }
107
108 CSSToken& resultToken(aResult.SetValue());
109
110 resultToken.mTokenType = static_cast<CSSTokenType>(token.mType);
111 resultToken.mStartOffset = mScanner.GetTokenOffset();
112 resultToken.mEndOffset = mScanner.GetTokenEndOffset();
113
114 switch (token.mType) {
115 case eCSSToken_Whitespace:
116 break;
117
118 case eCSSToken_Ident:
119 case eCSSToken_Function:
120 case eCSSToken_AtKeyword:
121 case eCSSToken_ID:
122 case eCSSToken_Hash:
123 resultToken.mText.Construct(token.mIdent);
124 break;
125
126 case eCSSToken_Dimension:
127 resultToken.mText.Construct(token.mIdent);
128 MOZ_FALLTHROUGH;
129 case eCSSToken_Number:
130 case eCSSToken_Percentage:
131 resultToken.mNumber.Construct(token.mNumber);
132 resultToken.mHasSign.Construct(token.mHasSign);
133 resultToken.mIsInteger.Construct(token.mIntegerValid);
134 break;
135
136 case eCSSToken_String:
137 case eCSSToken_Bad_String:
138 case eCSSToken_URL:
139 case eCSSToken_Bad_URL:
140 resultToken.mText.Construct(token.mIdent);
141 /* Don't bother emitting the delimiter, as it is readily extracted
142 from the source string when needed. */
143 break;
144
145 case eCSSToken_Symbol:
146 resultToken.mText.Construct(nsString(&token.mSymbol, 1));
147 break;
148
149 case eCSSToken_Includes:
150 case eCSSToken_Dashmatch:
151 case eCSSToken_Beginsmatch:
152 case eCSSToken_Endsmatch:
153 case eCSSToken_Containsmatch:
154 case eCSSToken_URange:
155 break;
156
157 case eCSSToken_Comment:
158 case eCSSToken_HTMLComment:
159 /* The comment text is easily extracted from the source string,
160 and is rarely useful. */
161 break;
162 }
163 }
164
165 } // namespace dom
166 } // namespace mozilla
167