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[wxWidgets.git] / src / html / htmltag.cpp
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1/////////////////////////////////////////////////////////////////////////////
2// Name: htmltag.cpp
3// Purpose: wxHtmlTag class (represents single tag)
4// Author: Vaclav Slavik
69941f05 5// RCS-ID: $Id$
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6// Copyright: (c) 1999 Vaclav Slavik
7// Licence: wxWindows Licence
8/////////////////////////////////////////////////////////////////////////////
9
10
11#ifdef __GNUG__
12#pragma implementation
13#endif
14
3096bd2f 15#include "wx/wxprec.h"
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16
17#include "wx/defs.h"
18#if wxUSE_HTML
19
20#ifdef __BORDLANDC__
21#pragma hdrstop
22#endif
23
24#ifndef WXPRECOMP
3096bd2f 25#include "wx/wx.h"
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26#endif
27
69941f05 28#include "wx/html/htmltag.h"
daa616fc 29#include "wx/html/htmlpars.h"
7e1e0960 30#include <stdio.h> // for vsscanf
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31#include <stdarg.h>
32
33
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34//-----------------------------------------------------------------------------
35// wxHtmlTagsCache
36//-----------------------------------------------------------------------------
37
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38struct wxHtmlCacheItem
39{
40 // this is "pos" value passed to wxHtmlTag's constructor.
41 // it is position of '<' character of the tag
42 int Key;
43
44 // end positions for the tag:
45 // end1 is '<' of ending tag,
46 // end2 is '>' or both are
47 // -1 if there is no ending tag for this one...
48 // or -2 if this is ending tag </...>
49 int End1, End2;
50
51 // name of this tag
52 wxChar *Name;
53};
54
55
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56IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
57
58#define CACHE_INCREMENT 64
59
60wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
61{
66a77a74 62 const wxChar *src = source.c_str();
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63 int i, tg, pos, stpos;
64 int lng = source.Length();
66a77a74 65 wxChar dummy[256];
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66
67 m_Cache = NULL;
68 m_CacheSize = 0;
69 m_CachePos = 0;
70
71 pos = 0;
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72 while (pos < lng)
73 {
74 if (src[pos] == wxT('<')) // tag found:
a914db0f 75 {
5526e819 76 if (m_CacheSize % CACHE_INCREMENT == 0)
5e8e25e7 77 m_Cache = (wxHtmlCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(wxHtmlCacheItem));
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78 tg = m_CacheSize++;
79 m_Cache[tg].Key = stpos = pos++;
80 dummy[0] = 0; i = 0;
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81 while (pos < lng &&
82 src[pos] != wxT('>') &&
f6bcfd97 83 src[pos] != wxT(' ') && src[pos] != wxT('\r') &&
4f9297b0 84 src[pos] != wxT('\n') && src[pos] != wxT('\t'))
a914db0f 85 {
5526e819 86 dummy[i] = src[pos++];
66a77a74 87 if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
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88 i++;
89 }
90 dummy[i] = 0;
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91 m_Cache[tg].Name = new wxChar[i+1];
92 memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));
5526e819 93
15db3cf5 94 while (pos < lng && src[pos] != wxT('>')) pos++;
5526e819 95
4f9297b0 96 if (src[stpos+1] == wxT('/')) // ending tag:
a914db0f 97 {
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98 m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
99 // find matching begin tag:
100 for (i = tg; i >= 0; i--)
4f9297b0 101 if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0))
a914db0f 102 {
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103 m_Cache[i].End1 = stpos;
104 m_Cache[i].End2 = pos + 1;
105 break;
106 }
107 }
4f9297b0 108 else
a914db0f 109 {
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110 m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
111 }
112 }
113
114 pos++;
115 }
116
117 // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
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118 for (i = 0; i < m_CacheSize; i++)
119 {
2776d7c3 120 delete[] m_Cache[i].Name;
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121 m_Cache[i].Name = NULL;
122 }
123}
124
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125void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
126{
127 if (m_Cache == NULL) return;
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128 if (m_Cache[m_CachePos].Key != at)
129 {
5526e819 130 int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
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131 do
132 {
133 m_CachePos += delta;
134 }
135 while (m_Cache[m_CachePos].Key != at);
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136 }
137 *end1 = m_Cache[m_CachePos].End1;
138 *end2 = m_Cache[m_CachePos].End2;
139}
140
141
142
143
144//-----------------------------------------------------------------------------
145// wxHtmlTag
146//-----------------------------------------------------------------------------
147
148IMPLEMENT_CLASS(wxHtmlTag,wxObject)
149
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150wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos,
151 wxHtmlTagsCache *cache,
152 wxHtmlEntitiesParser *entParser) : wxObject()
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153{
154 int i;
daa616fc 155 wxChar c;
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156
157 // fill-in name, params and begin pos:
5526e819 158 i = pos+1;
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159 if (source[i] == wxT('/'))
160 { m_Ending = TRUE; i++; }
161 else
162 m_Ending = FALSE;
5526e819 163
b076dc01 164 // find tag's name and convert it to uppercase:
f6bcfd97 165 while ((i < end_pos) &&
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166 ((c = source[i++]) != wxT(' ') && c != wxT('\r') &&
167 c != wxT('\n') && c != wxT('\t') &&
168 c != wxT('>')))
a914db0f 169 {
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170 if ((c >= wxT('a')) && (c <= wxT('z')))
171 c -= (wxT('a') - wxT('A'));
172 m_Name << c;
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173 }
174
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175 // if the tag has parameters, read them and "normalize" them,
176 // i.e. convert to uppercase, replace whitespaces by spaces and
177 // remove whitespaces around '=':
c9893146 178 if (source[i-1] != wxT('>'))
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179 {
180 #define IS_WHITE(c) (c == wxT(' ') || c == wxT('\r') || \
181 c == wxT('\n') || c == wxT('\t'))
182 wxString pname, pvalue;
183 wxChar quote;
184 enum
a914db0f 185 {
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186 ST_BEFORE_NAME = 1,
187 ST_NAME,
188 ST_BEFORE_EQ,
189 ST_BEFORE_VALUE,
190 ST_VALUE
191 } state;
192
193 quote = 0;
194 state = ST_BEFORE_NAME;
195 while (i < end_pos)
196 {
197 c = source[i++];
198
199 if (c == wxT('>') && !(state == ST_VALUE && quote != 0))
a914db0f 200 {
daa616fc 201 if (state == ST_BEFORE_EQ || state == ST_NAME)
b076dc01 202 {
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203 m_ParamNames.Add(pname);
204 m_ParamValues.Add(wxEmptyString);
b076dc01 205 }
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206 else if (state == ST_VALUE && quote == 0)
207 {
208 m_ParamNames.Add(pname);
209 m_ParamValues.Add(entParser->Parse(pvalue));
210 }
211 break;
5526e819 212 }
daa616fc 213 switch (state)
a914db0f 214 {
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215 case ST_BEFORE_NAME:
216 if (!IS_WHITE(c))
217 {
218 pname = c;
219 state = ST_NAME;
220 }
221 break;
222 case ST_NAME:
223 if (IS_WHITE(c))
224 state = ST_BEFORE_EQ;
225 else if (c == wxT('='))
226 state = ST_BEFORE_VALUE;
227 else
228 pname << c;
229 break;
230 case ST_BEFORE_EQ:
231 if (c == wxT('='))
232 state = ST_BEFORE_VALUE;
233 else if (!IS_WHITE(c))
234 {
235 m_ParamNames.Add(pname);
236 m_ParamValues.Add(wxEmptyString);
237 pname = c;
238 state = ST_NAME;
239 }
240 break;
241 case ST_BEFORE_VALUE:
242 if (!IS_WHITE(c))
243 {
244 if (c == wxT('"') || c == wxT('\''))
245 quote = c, pvalue = wxEmptyString;
246 else
247 quote = 0, pvalue = c;
248 state = ST_VALUE;
249 }
250 break;
251 case ST_VALUE:
252 if ((quote != 0 && c == quote) ||
253 (quote == 0 && IS_WHITE(c)))
254 {
255 m_ParamNames.Add(pname);
256 if (quote == 0)
257 {
258 // VS: backward compatibility, no real reason,
259 // but wxHTML code relies on this... :(
260 pvalue.MakeUpper();
261 }
262 m_ParamValues.Add(entParser->Parse(pvalue));
263 state = ST_BEFORE_NAME;
264 }
265 else
266 pvalue << c;
267 break;
72aa4a98 268 }
5526e819 269 }
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270
271 #undef IS_WHITE
272 }
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273 m_Begin = i;
274
4f9297b0 275 cache->QueryTag(pos, &m_End1, &m_End2);
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276 if (m_End1 > end_pos) m_End1 = end_pos;
277 if (m_End2 > end_pos) m_End2 = end_pos;
278}
279
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280bool wxHtmlTag::HasParam(const wxString& par) const
281{
daa616fc 282 return (m_ParamNames.Index(par, FALSE) != wxNOT_FOUND);
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283}
284
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285wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
286{
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287 int index = m_ParamNames.Index(par, FALSE);
288 if (index == wxNOT_FOUND)
289 return wxEmptyString;
290 if (with_commas)
4f9297b0 291 {
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292 // VS: backward compatibility, seems to be never used by wxHTML...
293 wxString s;
294 s << wxT('"') << m_ParamValues[index] << wxT('"');
295 return s;
5526e819 296 }
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297 else
298 return m_ParamValues[index];
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299}
300
66a77a74 301int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
5526e819 302{
5526e819 303 wxString parval = GetParam(par);
161f4f73 304 return wxSscanf(parval, format, param);
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305}
306
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307bool wxHtmlTag::GetParamAsColour(const wxString& par, wxColour *clr) const
308{
309 wxString str = GetParam(par);
310
311 if (str.IsEmpty()) return FALSE;
312 if (str.GetChar(0) == wxT('#'))
313 {
314 unsigned long tmp;
315 if (ScanParam(par, wxT("#%lX"), &tmp) != 1)
316 return FALSE;
317 *clr = wxColour((unsigned char)((tmp & 0xFF0000) >> 16),
318 (unsigned char)((tmp & 0x00FF00) >> 8),
319 (unsigned char)(tmp & 0x0000FF));
320 return TRUE;
321 }
322 else
323 {
324 // Handle colours defined in HTML 4.0:
325 #define HTML_COLOUR(name,r,g,b) \
326 if (str.IsSameAs(wxT(name), FALSE)) \
327 { *clr = wxColour(r,g,b); return TRUE; }
328 HTML_COLOUR("black", 0x00,0x00,0x00)
329 HTML_COLOUR("silver", 0xC0,0xC0,0xC0)
330 HTML_COLOUR("gray", 0x80,0x80,0x80)
331 HTML_COLOUR("white", 0xFF,0xFF,0xFF)
332 HTML_COLOUR("maroon", 0x80,0x00,0x00)
333 HTML_COLOUR("red", 0xFF,0x00,0x00)
334 HTML_COLOUR("purple", 0x80,0x00,0x80)
335 HTML_COLOUR("fuchsia", 0xFF,0x00,0xFF)
336 HTML_COLOUR("green", 0x00,0x80,0x00)
337 HTML_COLOUR("lime", 0x00,0xFF,0x00)
338 HTML_COLOUR("olive", 0x80,0x80,0x00)
339 HTML_COLOUR("yellow", 0xFF,0xFF,0x00)
340 HTML_COLOUR("navy", 0x00,0x00,0x80)
341 HTML_COLOUR("blue", 0x00,0x00,0xFF)
342 HTML_COLOUR("teal", 0x00,0x80,0x80)
343 HTML_COLOUR("aqua", 0x00,0xFF,0xFF)
344 #undef HTML_COLOUR
345 return FALSE;
346 }
347}
348
349bool wxHtmlTag::GetParamAsInt(const wxString& par, int *clr) const
350{
351 if (!HasParam(par)) return FALSE;
352 long i;
353 bool succ = GetParam(par).ToLong(&i);
354 *clr = (int)i;
355 return succ;
356}
357
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358wxString wxHtmlTag::GetAllParams() const
359{
360 // VS: this function is for backward compatiblity only,
361 // never used by wxHTML
362 wxString s;
363 size_t cnt = m_ParamNames.GetCount();
364 for (size_t i = 0; i < cnt; i++)
365 {
366 s << m_ParamNames[i];
367 s << wxT('=');
368 if (m_ParamValues[i].Find(wxT('"')) != wxNOT_FOUND)
369 s << wxT('\'') << m_ParamValues[i] << wxT('\'');
370 else
371 s << wxT('"') << m_ParamValues[i] << wxT('"');
372 }
373 return s;
374}
375
4d223b67 376#endif