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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 void wxHtmlParser::InitParser(const wxString& source)
55 {
56 SetSource(source);
57 }
58
59 void wxHtmlParser::DoneParser()
60 {
61 delete m_Cache;
62 m_Cache = NULL;
63 }
64
65 void wxHtmlParser::SetSource(const wxString& src)
66 {
67 m_Source = src;
68 delete m_Cache;
69 m_Cache = new wxHtmlTagsCache(m_Source);
70 }
71
72 void wxHtmlParser::DoParsing(int begin_pos, int end_pos)
73 {
74 if (end_pos <= begin_pos) return;
75
76 char c;
77 char *temp = new char[end_pos - begin_pos + 1];
78 int i;
79 int templen;
80
81 templen = 0;
82 i = begin_pos;
83
84 while (i < end_pos)
85 {
86 c = m_Source[(unsigned int) i];
87
88 // continue building word:
89 if (c != '<')
90 {
91 temp[templen++] = c;
92 i++;
93 }
94
95 else if (c == '<')
96 {
97 wxHtmlTag tag(m_Source, i, end_pos, m_Cache);
98
99 if (templen)
100 {
101 temp[templen] = 0;
102 AddText(temp);
103 templen = 0;
104 }
105 AddTag(tag);
106 if (tag.HasEnding()) i = tag.GetEndPos2();
107 else i = tag.GetBeginPos();
108 }
109 }
110
111 if (templen)
112 { // last word of block :-(
113 temp[templen] = 0;
114 AddText(temp);
115 }
116 delete[] temp;
117 }
118
119 void wxHtmlParser::AddTag(const wxHtmlTag& tag)
120 {
121 wxHtmlTagHandler *h;
122 bool inner = FALSE;
123
124 h = (wxHtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
125 if (h)
126 inner = h->HandleTag(tag);
127 if (!inner)
128 {
129 if (tag.HasEnding())
130 DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
131 }
132 }
133
134 void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler)
135 {
136 wxString s(handler->GetSupportedTags());
137 wxStringTokenizer tokenizer(s, ", ");
138
139 while (tokenizer.HasMoreTokens())
140 m_HandlersHash.Put(tokenizer.NextToken(), handler);
141
142 if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
143 m_HandlersList.Append(handler);
144
145 handler->SetParser(this);
146 }
147
148 void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags)
149 {
150 wxStringTokenizer tokenizer(tags, ", ");
151 wxString key;
152
153 if (m_HandlersStack == NULL)
154 {
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 {
163 key = tokenizer.NextToken();
164 m_HandlersHash.Delete(key);
165 m_HandlersHash.Put(key, handler);
166 }
167 }
168
169 void wxHtmlParser::PopTagHandler()
170 {
171 wxNode *first;
172
173 if (m_HandlersStack == NULL ||
174 (first = m_HandlersStack->GetFirst()) == NULL)
175 {
176 wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
177 return;
178 }
179 m_HandlersHash = *((wxHashTable*) first->GetData());
180 m_HandlersStack->DeleteNode(first);
181 }
182
183 wxHtmlParser::~wxHtmlParser()
184 {
185 if (m_HandlersStack) delete m_HandlersStack;
186 m_HandlersHash.Clear();
187 m_HandlersList.DeleteContents(TRUE);
188 m_HandlersList.Clear();
189 }
190
191 //-----------------------------------------------------------------------------
192 // wxHtmlTagHandler
193 //-----------------------------------------------------------------------------
194
195 IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject)
196 #endif
197