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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: htmlpars.cpp
3 // Purpose: wxHtmlParser class (generic parser)
4 // Author: Vaclav Slavik
5 // RCS-ID: $Id$
6 // Copyright: (c) 1999 Vaclav Slavik
7 // Licence: wxWindows Licence
8 /////////////////////////////////////////////////////////////////////////////
9
10
11 #ifdef __GNUG__
12 #pragma implementation
13 #endif
14
15 #include "wx/wxprec.h"
16
17 #include "wx/defs.h"
18 #if wxUSE_HTML && wxUSE_STREAMS
19
20 #ifdef __BORDLANDC__
21 #pragma hdrstop
22 #endif
23
24 #ifndef WXPRECOMP
25 #include "wx/wx.h"
26 #endif
27
28 #include "wx/tokenzr.h"
29 #include "wx/wfstream.h"
30 #include "wx/url.h"
31 #include "wx/html/htmldefs.h"
32 #include "wx/html/htmlpars.h"
33
34
35
36 //-----------------------------------------------------------------------------
37 // wxHtmlParser
38 //-----------------------------------------------------------------------------
39
40 IMPLEMENT_ABSTRACT_CLASS(wxHtmlParser,wxObject)
41
42
43 wxObject* wxHtmlParser::Parse(const wxString& source)
44 {
45 wxObject *result;
46
47 InitParser(source);
48 DoParsing();
49 result = GetProduct();
50 DoneParser();
51 return result;
52 }
53
54
55
56 void wxHtmlParser::InitParser(const wxString& source)
57 {
58 m_Source = source;
59 m_Cache = new wxHtmlTagsCache(m_Source);
60 }
61
62
63
64 void wxHtmlParser::DoneParser()
65 {
66 delete m_Cache;
67 m_Cache = NULL;
68 }
69
70
71
72
73 void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
74 {
75 if (end_pos <= begin_pos) return;
76
77 char c;
78 char *temp = new char[end_pos - begin_pos + 1];
79 int i;
80 int templen;
81
82 templen = 0;
83 i = begin_pos;
84
85 while (i < end_pos) {
86 c = m_Source[(unsigned int) i];
87
88 // continue building word:
89 if (c != '<') {
90 temp[templen++] = c;
91 i++;
92 }
93
94 else if (c == '<') {
95 wxHtmlTag tag(m_Source, i, end_pos, m_Cache);
96
97 if (templen) {
98 temp[templen] = 0;
99 AddText(temp);
100 templen = 0;
101 }
102 AddTag(tag);
103 if (tag.HasEnding()) i = tag.GetEndPos2();
104 else i = tag.GetBeginPos();
105 }
106 }
107
108 if (templen) { // last word of block :-(
109 temp[templen] = 0;
110 AddText(temp);
111 }
112 delete[] temp;
113 }
114
115
116
117 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
118 {
119 wxHtmlTagHandler *h;
120 bool inner = FALSE;
121
122 h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
123 if (h)
124 inner = h -> HandleTag(tag);
125 if (!inner) {
126 if (tag.HasEnding())
127 DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
128 }
129 }
130
131
132
133 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
134 {
135 wxString s(handler -> GetSupportedTags());
136 wxStringTokenizer tokenizer(s, ", ");
137
138 while (tokenizer.HasMoreTokens())
139 m_HandlersHash.Put(tokenizer.NextToken(), handler);
140
141 if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
142 m_HandlersList.Append(handler);
143
144 handler -> SetParser(this);
145 }
146
147
148
149 void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
150 {
151 wxStringTokenizer tokenizer(tags, ", ");
152 wxString key;
153
154 if (m_HandlersStack == NULL) {
155 m_HandlersStack = new wxList;
156 m_HandlersStack -> DeleteContents(TRUE);
157 }
158
159 m_HandlersStack -> Insert(new wxHashTable(m_HandlersHash));
160
161 while (tokenizer.HasMoreTokens()) {
162 key = tokenizer.NextToken();
163 m_HandlersHash.Delete(key);
164 m_HandlersHash.Put(key, handler);
165 }
166 }
167
168
169
170 void wxHtmlParser::PopTagHandler()
171 {
172 wxNode *first;
173
174 if (m_HandlersStack == NULL ||
175 (first = m_HandlersStack -> GetFirst()) == NULL)
176 {
177 wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
178 return;
179 }
180 m_HandlersHash = *((wxHashTable*) first -> GetData());
181 m_HandlersStack -> DeleteNode(first);
182 }
183
184
185
186 wxHtmlParser::~wxHtmlParser()
187 {
188 if (m_HandlersStack) delete m_HandlersStack;
189 m_HandlersHash.Clear();
190 m_HandlersList.DeleteContents(TRUE);
191 m_HandlersList.Clear();
192 }
193
194
195
196 //-----------------------------------------------------------------------------
197 // wxHtmlTagHandler
198 //-----------------------------------------------------------------------------
199
200 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
201 #endif
202