| 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 |
| 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 | #define wxHTML_MAX_BUFLEN 1024 |
| 73 | |
| 74 | void wxHtmlParser::DoParsing(int begin_pos, int end_pos) |
| 75 | { |
| 76 | char temp[wxHTML_BUFLEN], c; |
| 77 | int i; |
| 78 | int templen; |
| 79 | |
| 80 | templen = 0; |
| 81 | i = begin_pos; |
| 82 | |
| 83 | while (i < end_pos) { |
| 84 | c = m_Source[(unsigned int) i]; |
| 85 | |
| 86 | // continue building word: |
| 87 | if (c != '<') { |
| 88 | temp[templen++] = c; |
| 89 | if (templen == wxHTML_BUFLEN-1) { |
| 90 | temp[templen] = 0; |
| 91 | AddText(temp); |
| 92 | templen = 0; |
| 93 | } |
| 94 | i++; |
| 95 | } |
| 96 | |
| 97 | else if (c == '<') { |
| 98 | wxHtmlTag tag(m_Source, i, end_pos, m_Cache); |
| 99 | |
| 100 | if (templen) { |
| 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) { // last word of block :-( |
| 112 | temp[templen] = 0; |
| 113 | AddText(temp); |
| 114 | } |
| 115 | } |
| 116 | |
| 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 | if (tag.HasEnding()) |
| 129 | DoParsing(tag.GetBeginPos(), tag.GetEndPos1()); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | |
| 134 | |
| 135 | void wxHtmlParser::AddTagHandler(wxHtmlTagHandler *handler) |
| 136 | { |
| 137 | wxString s(handler -> GetSupportedTags()); |
| 138 | wxStringTokenizer tokenizer(s, ", "); |
| 139 | |
| 140 | while (tokenizer.HasMoreTokens()) |
| 141 | m_HandlersHash.Put(tokenizer.NextToken(), handler); |
| 142 | |
| 143 | if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND) |
| 144 | m_HandlersList.Append(handler); |
| 145 | |
| 146 | handler -> SetParser(this); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | |
| 151 | void wxHtmlParser::PushTagHandler(wxHtmlTagHandler *handler, wxString tags) |
| 152 | { |
| 153 | wxStringTokenizer tokenizer(tags, ", "); |
| 154 | wxString key; |
| 155 | |
| 156 | if (m_HandlersStack == NULL) { |
| 157 | m_HandlersStack = new wxList; |
| 158 | m_HandlersStack -> DeleteContents(TRUE); |
| 159 | } |
| 160 | |
| 161 | m_HandlersStack -> Insert(new wxHashTable(m_HandlersHash)); |
| 162 | |
| 163 | while (tokenizer.HasMoreTokens()) { |
| 164 | key = tokenizer.NextToken(); |
| 165 | m_HandlersHash.Delete(key); |
| 166 | m_HandlersHash.Put(key, handler); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | |
| 171 | |
| 172 | void wxHtmlParser::PopTagHandler() |
| 173 | { |
| 174 | wxNode *first; |
| 175 | |
| 176 | if (m_HandlersStack == NULL || |
| 177 | (first = m_HandlersStack -> GetFirst()) == NULL) |
| 178 | { |
| 179 | wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack.")); |
| 180 | return; |
| 181 | } |
| 182 | m_HandlersHash = *((wxHashTable*) first -> GetData()); |
| 183 | m_HandlersStack -> DeleteNode(first); |
| 184 | } |
| 185 | |
| 186 | |
| 187 | |
| 188 | wxHtmlParser::~wxHtmlParser() |
| 189 | { |
| 190 | if (m_HandlersStack) delete m_HandlersStack; |
| 191 | m_HandlersHash.Clear(); |
| 192 | m_HandlersList.DeleteContents(TRUE); |
| 193 | m_HandlersList.Clear(); |
| 194 | } |
| 195 | |
| 196 | |
| 197 | |
| 198 | //----------------------------------------------------------------------------- |
| 199 | // wxHtmlTagHandler |
| 200 | //----------------------------------------------------------------------------- |
| 201 | |
| 202 | IMPLEMENT_ABSTRACT_CLASS(wxHtmlTagHandler,wxObject) |
| 203 | #endif |
| 204 | |