summaryrefslogtreecommitdiff
path: root/sw/source/filter/html/parcss1.hxx
blob: 51be36105fcaf1ec12bf811b983a6c7f40f444f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_SW_SOURCE_FILTER_HTML_PARCSS1_HXX
#define INCLUDED_SW_SOURCE_FILTER_HTML_PARCSS1_HXX

// tokens of the CSS1 parser
enum CSS1Token
{
    CSS1_NULL,

    CSS1_IDENT,
    CSS1_STRING,
    CSS1_NUMBER,
    CSS1_PERCENTAGE,
    CSS1_LENGTH,    // absolute length in 1/100 MM
    CSS1_PIXLENGTH, // length in pixels
    CSS1_EMS,
    CSS1_EMX,
    CSS1_HEXCOLOR,

    CSS1_DOT_W_WS,
    CSS1_DOT_WO_WS,
    CSS1_COLON,
    CSS1_SLASH,
    CSS1_PLUS,
    CSS1_MINUS,
    CSS1_OBRACE,
    CSS1_CBRACE,
    CSS1_SEMICOLON,
    CSS1_COMMA,
    CSS1_HASH,

    CSS1_IMPORT_SYM,
    CSS1_PAGE_SYM, // Feature: PrintExt

    CSS1_IMPORTANT_SYM,

    CSS1_URL,
    CSS1_RGB
};

enum CSS1ParserState
{
    CSS1_PAR_ACCEPTED = 0,
    CSS1_PAR_WORKING
};

enum CSS1SelectorType
{
    CSS1_SELTYPE_ELEMENT,
    CSS1_SELTYPE_ELEM_CLASS,
    CSS1_SELTYPE_CLASS,
    CSS1_SELTYPE_ID,
    CSS1_SELTYPE_PSEUDO,
    CSS1_SELTYPE_PAGE // Feature: PrintExt
};

/** A simple selector
 *
 * This class represents a simple selector, e.g.
 * - a HTML element name
 * - a HTML element name with a class (separated by a dot)
 * - a class (without a dot)
 * - an ID (set with ID=xxx)
 * - a pseudo element
 *
 * These simple selectors are chained in a list to complete selectors
 */
class CSS1Selector
{
    CSS1SelectorType eType; // the type
    OUString aSelector;     // the selector itself
    CSS1Selector *pNext;    // the following component

public:
    CSS1Selector( CSS1SelectorType eTyp, const OUString &rSel )
        : eType(eTyp), aSelector( rSel ), pNext( nullptr )
    {}

    ~CSS1Selector();

    CSS1SelectorType GetType() const { return eType; }
    const OUString& GetString() const { return aSelector; }

    void SetNext( CSS1Selector *pNxt ) { pNext = pNxt; }
    const CSS1Selector *GetNext() const { return pNext; }
};

/** a subexpression of a CSS1 declaration
 *
 * It contains
 * - the type of this expression (= token)
 * - the value as string (and/or double, with algebraic sign for NUMBER and LENGTH)
 * - the operator with that it is connected with the *predecessor* expression
 */
struct CSS1Expression
{
    sal_Unicode cOp; // type of the link with its predecessor
    CSS1Token eType; // type of the expression
    OUString aValue; // value as string
    double nValue;   // value as number (TWIPs for LENGTH)
    CSS1Expression *pNext; // the following component

public:
    CSS1Expression( CSS1Token eTyp, const OUString &rVal,
                    double nVal, sal_Unicode cO = 0 )
        : cOp(cO), eType(eTyp), aValue(rVal), nValue(nVal), pNext(nullptr)
    {}

    ~CSS1Expression();

    inline void Set( CSS1Token eTyp, const OUString &rVal, double nVal );

    CSS1Token GetType() const { return eType; }
    const OUString& GetString() const { return aValue; }
    double GetNumber() const { return nValue; }
    inline sal_uInt32 GetULength() const;
    inline sal_Int32 GetSLength() const;
    sal_Unicode GetOp() const { return cOp; }

    void GetURL( OUString& rURL ) const;
    bool GetColor( Color &rRGB ) const;

    void SetNext( CSS1Expression *pNxt ) { pNext = pNxt; }
    const CSS1Expression *GetNext() const { return pNext; }
};

inline void CSS1Expression::Set( CSS1Token eTyp, const OUString &rVal,
                                 double nVal )
{
    cOp = 0; eType = eTyp; aValue = rVal; nValue = nVal; pNext = nullptr;
}

inline sal_uInt32 CSS1Expression::GetULength() const
{
    return nValue < 0. ? 0UL : (sal_uInt32)(nValue + .5);
}

inline sal_Int32 CSS1Expression::GetSLength() const
{
    return (sal_Int32)(nValue + (nValue < 0. ? -.5 : .5 ));
}

/** Parser of a style element/option
 *
 * This class parses the content of a style element or a style option and preprocesses it.
 *
 * The result of the parser is forwarded to derived parsers by the methods SelectorParsed()
 * and DeclarationParsed(). Example:
 * H1, H2 { font-weight: bold; text-align: right }
 *  |  |                    |                  |
 *  |  |                    |                  DeclP( 'text-align', 'right' )
 *  |  |                    DeclP( 'font-weight', 'bold' )
 *  |  SelP( 'H2', false )
 *  SelP( 'H1', true )
 */
class CSS1Parser
{
    bool bWhiteSpace : 1; // read a whitespace?
    bool bEOF : 1; // is end of "file"?

    sal_Unicode cNextCh; // next character

    sal_Int32 nInPos; // current position in the input string

    sal_uInt32 nlLineNr; // current row number
    sal_uInt32 nlLinePos; // current column number

    double nValue; // value of the token as number

    CSS1ParserState eState; // current state of the parser
    CSS1Token nToken; // the current token

    OUString aIn; // the string to parse
    OUString aToken; // token as string

    /// prepare parsing
    void InitRead( const OUString& rIn );

    /// @returns the next character to parse
    sal_Unicode GetNextChar();

    /// @returns the next token to parse
    CSS1Token GetNextToken();

    /// Is the parser still working?
    bool IsParserWorking() const { return CSS1_PAR_WORKING == eState; }

    bool IsEOF() const { return bEOF; }

    void IncLineNr() { ++nlLineNr; }
    sal_uInt32 IncLinePos() { return ++nlLinePos; }
    inline void SetLinePos( sal_uInt32 nlPos ); // inline declaration below

    // parse parts of the grammar
    void ParseRule();
    CSS1Selector *ParseSelector();
    CSS1Expression *ParseDeclaration( OUString& rProperty );

protected:
    void ParseStyleSheet();

    /** parse the content of a HTML style element
     *
     * For each selector and each declaration the methods SelectorParsed()
     * or DeclarationParsed() need to be called afterwards
     *
     * @param rIn the style element as string
     * @return true if ???
     */
    bool ParseStyleSheet( const OUString& rIn );

    /** parse the content of a HTML style option
     *
     * For each selector and each declaration the methods SelectorParsed()
     * or DeclarationParsed() need to be called afterwards.
     *
     * @param rIn the style option as string
     * @return true if ???
     */
    bool ParseStyleOption( const OUString& rIn );

    /** Called after a selector was parsed.
     *
     * @param pSelector The selector that was parsed
     * @param bFirst if true, a new declaration starts with this selector
     * @return If true, the selector will be deleted. (Returns always true?)
     */
    virtual bool SelectorParsed( CSS1Selector* pSelector, bool bFirst );

    /** Called after a declaration or property was parsed
     *
     * @param rProperty The declaration/property
     * @param pExpr ???
     * @return If true, the declaration will be deleted. (Returns always true?)
     */
    virtual bool DeclarationParsed( const OUString& rProperty,
                                    const CSS1Expression *pExpr );

public:
    CSS1Parser();
    virtual ~CSS1Parser();
};

inline void CSS1Parser::SetLinePos( sal_uInt32 nlPos )
{
    nlLinePos = nlPos;
}

#endif

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */