| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: xmlexpat.cpp |
| 3 | // Purpose: wxXmlDocument - XML reader via Expat |
| 4 | // Author: Vaclav Slavik |
| 5 | // Created: 2001/04/30 |
| 6 | // RCS-ID: $Id$ |
| 7 | // Copyright: (c) 2001 Vaclav Slavik |
| 8 | // Licence: wxWindows licence |
| 9 | ///////////////////////////////////////////////////////////////////////////// |
| 10 | |
| 11 | #ifdef __GNUG__ |
| 12 | // nothing - already in xml.cpp |
| 13 | #endif |
| 14 | |
| 15 | // For compilers that support precompilation, includes "wx.h". |
| 16 | #include "wx/wxprec.h" |
| 17 | |
| 18 | #ifdef __BORLANDC__ |
| 19 | #pragma hdrstop |
| 20 | #endif |
| 21 | |
| 22 | #include "wx/wfstream.h" |
| 23 | #include "wx/intl.h" |
| 24 | #include "wx/log.h" |
| 25 | #include "wx/strconv.h" |
| 26 | #include "wx/xrc/xmlio.h" |
| 27 | |
| 28 | #include "xmlparse.h" |
| 29 | |
| 30 | /* |
| 31 | |
| 32 | FIXME: |
| 33 | |
| 34 | - handle unknown encodings |
| 35 | - process all elements, including CDATA |
| 36 | - XML resources should automatically select desired encoding besed on |
| 37 | runtime environment (?) (would need BIN and BINZ formats modification, |
| 38 | too) |
| 39 | |
| 40 | */ |
| 41 | |
| 42 | |
| 43 | // converts Expat-produced string in UTF-8 into wxString. |
| 44 | inline static wxString CharToString(const char *s, size_t len = wxSTRING_MAXLEN) |
| 45 | { |
| 46 | #if wxUSE_UNICODE |
| 47 | return wxString(s, wxMBConvUTF8, len); |
| 48 | #else |
| 49 | return wxString(s, len); |
| 50 | #endif |
| 51 | } |
| 52 | |
| 53 | bool wxXmlIOHandlerExpat::CanLoad(wxInputStream& stream) |
| 54 | { |
| 55 | char cheader[7]; |
| 56 | cheader[6] = 0; |
| 57 | stream.Read(cheader, 6); |
| 58 | stream.SeekI(-6, wxFromCurrent); |
| 59 | return (strcmp(cheader, "<?xml ") == 0); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | struct wxXmlParsingContext |
| 64 | { |
| 65 | wxXmlNode *root; |
| 66 | wxXmlNode *node; |
| 67 | wxXmlNode *lastAsText; |
| 68 | wxString encoding; |
| 69 | wxString version; |
| 70 | }; |
| 71 | |
| 72 | static void StartElementHnd(void *userData, const char *name, const char **atts) |
| 73 | { |
| 74 | wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData; |
| 75 | wxXmlNode *node = new wxXmlNode(wxXML_ELEMENT_NODE, CharToString(name)); |
| 76 | const char **a = atts; |
| 77 | while (*a) |
| 78 | { |
| 79 | node->AddProperty(CharToString(a[0]), CharToString(a[1])); |
| 80 | a += 2; |
| 81 | } |
| 82 | if (ctx->root == NULL) |
| 83 | ctx->root = node; |
| 84 | else |
| 85 | ctx->node->AddChild(node); |
| 86 | ctx->node = node; |
| 87 | ctx->lastAsText = NULL; |
| 88 | } |
| 89 | |
| 90 | static void EndElementHnd(void *userData, const char* WXUNUSED(name)) |
| 91 | { |
| 92 | wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData; |
| 93 | |
| 94 | ctx->node = ctx->node->GetParent(); |
| 95 | ctx->lastAsText = NULL; |
| 96 | } |
| 97 | |
| 98 | static void TextHnd(void *userData, const char *s, int len) |
| 99 | { |
| 100 | wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData; |
| 101 | char *buf = new char[len + 1]; |
| 102 | |
| 103 | buf[len] = '\0'; |
| 104 | memcpy(buf, s, (size_t)len); |
| 105 | |
| 106 | if (ctx->lastAsText) |
| 107 | { |
| 108 | ctx->lastAsText->SetContent(ctx->lastAsText->GetContent() + |
| 109 | CharToString(buf)); |
| 110 | } |
| 111 | else |
| 112 | { |
| 113 | bool whiteOnly = TRUE; |
| 114 | for (char *c = buf; *c != '\0'; c++) |
| 115 | if (*c != ' ' && *c != '\t' && *c != '\n' && *c != '\r') |
| 116 | { |
| 117 | whiteOnly = FALSE; |
| 118 | break; |
| 119 | } |
| 120 | if (!whiteOnly) |
| 121 | { |
| 122 | ctx->lastAsText = new wxXmlNode(wxXML_TEXT_NODE, wxT("text"), |
| 123 | CharToString(buf)); |
| 124 | ctx->node->AddChild(ctx->lastAsText); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | delete[] buf; |
| 129 | } |
| 130 | |
| 131 | static void CommentHnd(void *userData, const char *data) |
| 132 | { |
| 133 | wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData; |
| 134 | |
| 135 | if (ctx->node) |
| 136 | { |
| 137 | // VS: ctx->node == NULL happens if there is a comment before |
| 138 | // the root element (e.g. wxDesigner's output). We ignore such |
| 139 | // comments, no big deal... |
| 140 | ctx->node->AddChild(new wxXmlNode(wxXML_COMMENT_NODE, |
| 141 | wxT("comment"), CharToString(data))); |
| 142 | } |
| 143 | ctx->lastAsText = NULL; |
| 144 | } |
| 145 | |
| 146 | static void DefaultHnd(void *userData, const char *s, int len) |
| 147 | { |
| 148 | // XML header: |
| 149 | if (len > 6 && memcmp(s, "<?xml ", 6) == 0) |
| 150 | { |
| 151 | wxXmlParsingContext *ctx = (wxXmlParsingContext*)userData; |
| 152 | |
| 153 | wxString buf = CharToString(s, (size_t)len); |
| 154 | int pos; |
| 155 | pos = buf.Find(wxT("encoding=")); |
| 156 | if (pos != wxNOT_FOUND) |
| 157 | ctx->encoding = buf.Mid(pos + 10).BeforeFirst(buf[(size_t)pos+9]); |
| 158 | pos = buf.Find(wxT("version=")); |
| 159 | if (pos != wxNOT_FOUND) |
| 160 | ctx->version = buf.Mid(pos + 9).BeforeFirst(buf[(size_t)pos+8]); |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | bool wxXmlIOHandlerExpat::Load(wxInputStream& stream, wxXmlDocument& doc) |
| 165 | { |
| 166 | const size_t BUFSIZE = 1024; |
| 167 | char buf[BUFSIZE]; |
| 168 | wxXmlParsingContext ctx; |
| 169 | bool done; |
| 170 | XML_Parser parser = XML_ParserCreate(NULL); |
| 171 | |
| 172 | ctx.root = ctx.node = NULL; |
| 173 | XML_SetUserData(parser, (void*)&ctx); |
| 174 | XML_SetElementHandler(parser, StartElementHnd, EndElementHnd); |
| 175 | XML_SetCharacterDataHandler(parser, TextHnd); |
| 176 | XML_SetCommentHandler(parser, CommentHnd); |
| 177 | XML_SetDefaultHandler(parser, DefaultHnd); |
| 178 | |
| 179 | do |
| 180 | { |
| 181 | size_t len = stream.Read(buf, BUFSIZE).LastRead(); |
| 182 | done = (len < BUFSIZE); |
| 183 | if (!XML_Parse(parser, buf, len, done)) |
| 184 | { |
| 185 | wxLogError(_("XML parsing error: '%s' at line %d"), |
| 186 | XML_ErrorString(XML_GetErrorCode(parser)), |
| 187 | XML_GetCurrentLineNumber(parser)); |
| 188 | return FALSE; |
| 189 | } |
| 190 | } while (!done); |
| 191 | |
| 192 | doc.SetVersion(ctx.version); |
| 193 | doc.SetEncoding(ctx.encoding); |
| 194 | doc.SetRoot(ctx.root); |
| 195 | |
| 196 | XML_ParserFree(parser); |
| 197 | return TRUE; |
| 198 | } |