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wxWidgets/tests/benchmarks/htmlparser/htmlpars.cpp
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Vadim Zeitlin 756f010f35 Add wxClearList() function replacing WX_CLEAR_LIST() macro 
Keep the macro for compatibility but there is really no reason to use a
macro here.

Also document this macro, even if it's deprecated, as it's used outside
of wxWidgets code too and this allows us to redirect people using it to
wxClearList().
2024-04-13 19:36:52 +02:00

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/////////////////////////////////////////////////////////////////////////////
// Name: src/html/htmlpars.cpp
// Purpose: wx28HtmlParser class (generic parser)
// Author: Vaclav Slavik
// Copyright: (c) 1999 Vaclav Slavik
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#include "wx/wxprec.h"
#include "htmlpars.h"
#ifndef WXPRECOMP
#include "wx/dynarray.h"
#include "wx/log.h"
#include "wx/intl.h"
#include "wx/app.h"
#endif
#include "wx/crt.h"
#include "wx/tokenzr.h"
#include "wx/wfstream.h"
#include "wx/url.h"
#include "wx/fontmap.h"
#include "wx/html/htmldefs.h"
#include "wx/arrimpl.cpp"
// DLL options compatibility check:
WX_CHECK_BUILD_OPTIONS("wxHTML")
const wxChar *wxTRACE_HTML_DEBUG = wxT("htmldebug");
//-----------------------------------------------------------------------------
// wx28HtmlParser helpers
//-----------------------------------------------------------------------------
class wx28HtmlTextPiece
{
public:
wx28HtmlTextPiece(int pos, int lng) : m_pos(pos), m_lng(lng) {}
int m_pos, m_lng;
};
WX_DECLARE_OBJARRAY(wx28HtmlTextPiece, wx28HtmlTextPieces);
WX_DEFINE_OBJARRAY(wx28HtmlTextPieces)
class wx28HtmlParserState
{
public:
wx28HtmlTag *m_curTag;
wx28HtmlTag *m_tags;
wx28HtmlTextPieces *m_textPieces;
int m_curTextPiece;
wxString m_source;
wx28HtmlParserState *m_nextState;
};
//-----------------------------------------------------------------------------
// wx28HtmlParser
//-----------------------------------------------------------------------------
wxIMPLEMENT_ABSTRACT_CLASS(wx28HtmlParser, wxObject);
wx28HtmlParser::wx28HtmlParser()
: wxObject(), m_HandlersHash(wxKEY_STRING),
m_FS(nullptr), m_HandlersStack(nullptr)
{
m_entitiesParser = new wx28HtmlEntitiesParser;
m_Tags = nullptr;
m_CurTag = nullptr;
m_TextPieces = nullptr;
m_CurTextPiece = 0;
m_SavedStates = nullptr;
}
wx28HtmlParser::~wx28HtmlParser()
{
while (RestoreState()) {}
DestroyDOMTree();
if (m_HandlersStack)
{
wxList& tmp = *m_HandlersStack;
wxList::iterator it, en;
for( it = tmp.begin(), en = tmp.end(); it != en; ++it )
delete (wxHashTable*)*it;
tmp.clear();
}
delete m_HandlersStack;
m_HandlersHash.Clear();
wxClearList(m_HandlersList);
delete m_entitiesParser;
}
wxObject* wx28HtmlParser::Parse(const wxString& source)
{
InitParser(source);
DoParsing();
wxObject *result = GetProduct();
DoneParser();
return result;
}
void wx28HtmlParser::InitParser(const wxString& source)
{
SetSource(source);
m_stopParsing = false;
}
void wx28HtmlParser::DoneParser()
{
DestroyDOMTree();
}
void wx28HtmlParser::SetSource(const wxString& src)
{
DestroyDOMTree();
m_Source = src;
CreateDOMTree();
m_CurTag = nullptr;
m_CurTextPiece = 0;
}
void wx28HtmlParser::CreateDOMTree()
{
wx28HtmlTagsCache cache(m_Source);
m_TextPieces = new wx28HtmlTextPieces;
CreateDOMSubTree(nullptr, 0, m_Source.length(), &cache);
m_CurTextPiece = 0;
}
extern bool wxIsCDATAElement(const wxChar *tag);
void wx28HtmlParser::CreateDOMSubTree(wx28HtmlTag *cur,
int begin_pos, int end_pos,
wx28HtmlTagsCache *cache)
{
if (end_pos <= begin_pos) return;
wxChar c;
int i = begin_pos;
int textBeginning = begin_pos;
// If the tag contains CDATA text, we include the text between beginning
// and ending tag verbosely. Setting i=end_pos will skip to the very
// end of this function where text piece is added, bypassing any child
// tags parsing (CDATA element can't have child elements by definition):
if (cur != nullptr && wxIsCDATAElement(cur->GetName().c_str()))
{
i = end_pos;
}
while (i < end_pos)
{
c = m_Source.GetChar(i);
if (c == wxT('<'))
{
// add text to m_TextPieces:
if (i - textBeginning > 0)
m_TextPieces->Add(
wx28HtmlTextPiece(textBeginning, i - textBeginning));
// if it is a comment, skip it:
if (i < end_pos-6 && m_Source.GetChar(i+1) == wxT('!') &&
m_Source.GetChar(i+2) == wxT('-') &&
m_Source.GetChar(i+3) == wxT('-'))
{
// Comments begin with "<!--" and end with "--[ \t\r\n]*>"
// according to HTML 4.0
int dashes = 0;
i += 4;
while (i < end_pos)
{
c = m_Source.GetChar(i++);
if ((c == wxT(' ') || c == wxT('\n') ||
c == wxT('\r') || c == wxT('\t')) && dashes >= 2) {}
else if (c == wxT('>') && dashes >= 2)
{
textBeginning = i;
break;
}
else if (c == wxT('-'))
dashes++;
else
dashes = 0;
}
}
// add another tag to the tree:
else if (i < end_pos-1 && m_Source.GetChar(i+1) != wxT('/'))
{
wx28HtmlTag *chd;
if (cur)
chd = new wx28HtmlTag(cur, m_Source,
i, end_pos, cache, m_entitiesParser);
else
{
chd = new wx28HtmlTag(nullptr, m_Source,
i, end_pos, cache, m_entitiesParser);
if (!m_Tags)
{
// if this is the first tag to be created make the root
// m_Tags point to it:
m_Tags = chd;
}
else
{
// if there is already a root tag add this tag as
// the last sibling:
chd->m_Prev = m_Tags->GetLastSibling();
chd->m_Prev->m_Next = chd;
}
}
if (chd->HasEnding())
{
CreateDOMSubTree(chd,
chd->GetBeginPos(), chd->GetEndPos1(),
cache);
i = chd->GetEndPos2();
}
else
i = chd->GetBeginPos();
textBeginning = i;
}
// ... or skip ending tag:
else
{
while (i < end_pos && m_Source.GetChar(i) != wxT('>')) i++;
textBeginning = i+1;
}
}
else i++;
}
// add remaining text to m_TextPieces:
if (end_pos - textBeginning > 0)
m_TextPieces->Add(
wx28HtmlTextPiece(textBeginning, end_pos - textBeginning));
}
void wx28HtmlParser::DestroyDOMTree()
{
wx28HtmlTag *t1, *t2;
t1 = m_Tags;
while (t1)
{
t2 = t1->GetNextSibling();
delete t1;
t1 = t2;
}
m_Tags = m_CurTag = nullptr;
delete m_TextPieces;
m_TextPieces = nullptr;
}
void wx28HtmlParser::DoParsing()
{
m_CurTag = m_Tags;
m_CurTextPiece = 0;
DoParsing(0, m_Source.length());
}
void wx28HtmlParser::DoParsing(int begin_pos, int end_pos)
{
if (end_pos <= begin_pos) return;
wx28HtmlTextPieces& pieces = *m_TextPieces;
size_t piecesCnt = pieces.GetCount();
while (begin_pos < end_pos)
{
while (m_CurTag && m_CurTag->GetBeginPos() < begin_pos)
m_CurTag = m_CurTag->GetNextTag();
while (m_CurTextPiece < piecesCnt &&
pieces[m_CurTextPiece].m_pos < begin_pos)
m_CurTextPiece++;
if (m_CurTextPiece < piecesCnt &&
(!m_CurTag ||
pieces[m_CurTextPiece].m_pos < m_CurTag->GetBeginPos()))
{
// Add text:
AddText(GetEntitiesParser()->Parse(
m_Source.Mid(pieces[m_CurTextPiece].m_pos,
pieces[m_CurTextPiece].m_lng)).t_str());
begin_pos = pieces[m_CurTextPiece].m_pos +
pieces[m_CurTextPiece].m_lng;
m_CurTextPiece++;
}
else if (m_CurTag)
{
if (m_CurTag->HasEnding())
begin_pos = m_CurTag->GetEndPos2();
else
begin_pos = m_CurTag->GetBeginPos();
wx28HtmlTag *t = m_CurTag;
m_CurTag = m_CurTag->GetNextTag();
AddTag(*t);
if (m_stopParsing)
return;
}
else break;
}
}
void wx28HtmlParser::AddTag(const wx28HtmlTag& tag)
{
wx28HtmlTagHandler *h;
bool inner = false;
h = (wx28HtmlTagHandler*) m_HandlersHash.Get(tag.GetName());
if (h)
{
inner = h->HandleTag(tag);
if (m_stopParsing)
return;
}
if (!inner)
{
if (tag.HasEnding())
DoParsing(tag.GetBeginPos(), tag.GetEndPos1());
}
}
void wx28HtmlParser::AddTagHandler(wx28HtmlTagHandler *handler)
{
wxString s(handler->GetSupportedTags());
wxStringTokenizer tokenizer(s, wxT(", "));
while (tokenizer.HasMoreTokens())
m_HandlersHash.Put(tokenizer.GetNextToken(), handler);
if (m_HandlersList.IndexOf(handler) == wxNOT_FOUND)
m_HandlersList.Append(handler);
handler->SetParser(this);
}
void wx28HtmlParser::PushTagHandler(wx28HtmlTagHandler *handler, const wxString& tags)
{
wxStringTokenizer tokenizer(tags, wxT(", "));
wxString key;
if (m_HandlersStack == nullptr)
{
m_HandlersStack = new wxList;
}
m_HandlersStack->Insert((wxObject*)new wxHashTable(m_HandlersHash));
while (tokenizer.HasMoreTokens())
{
key = tokenizer.GetNextToken();
m_HandlersHash.Delete(key);
m_HandlersHash.Put(key, handler);
}
}
void wx28HtmlParser::PopTagHandler()
{
wxList::compatibility_iterator first;
if ( !m_HandlersStack ||
!(first = m_HandlersStack->GetFirst()) )
{
wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
return;
}
m_HandlersHash = *((wxHashTable*) first->GetData());
delete (wxHashTable*) first->GetData();
m_HandlersStack->Erase(first);
}
void wx28HtmlParser::SetSourceAndSaveState(const wxString& src)
{
wx28HtmlParserState *s = new wx28HtmlParserState;
s->m_curTag = m_CurTag;
s->m_tags = m_Tags;
s->m_textPieces = m_TextPieces;
s->m_curTextPiece = m_CurTextPiece;
s->m_source = m_Source;
s->m_nextState = m_SavedStates;
m_SavedStates = s;
m_CurTag = nullptr;
m_Tags = nullptr;
m_TextPieces = nullptr;
m_CurTextPiece = 0;
m_Source = wxEmptyString;
SetSource(src);
}
bool wx28HtmlParser::RestoreState()
{
if (!m_SavedStates) return false;
DestroyDOMTree();
wx28HtmlParserState *s = m_SavedStates;
m_SavedStates = s->m_nextState;
m_CurTag = s->m_curTag;
m_Tags = s->m_tags;
m_TextPieces = s->m_textPieces;
m_CurTextPiece = s->m_curTextPiece;
m_Source = s->m_source;
delete s;
return true;
}
wxString wx28HtmlParser::GetInnerSource(const wx28HtmlTag& tag)
{
return GetSource()->Mid(tag.GetBeginPos(),
tag.GetEndPos1() - tag.GetBeginPos());
}
//-----------------------------------------------------------------------------
// wx28HtmlTagHandler
//-----------------------------------------------------------------------------
wxIMPLEMENT_ABSTRACT_CLASS(wx28HtmlTagHandler, wxObject);
void wx28HtmlTagHandler::ParseInnerSource(const wxString& source)
{
// It is safe to temporarily change the source being parsed,
// provided we restore the state back after parsing
m_Parser->SetSourceAndSaveState(source);
m_Parser->DoParsing();
m_Parser->RestoreState();
}
//-----------------------------------------------------------------------------
// wx28HtmlEntitiesParser
//-----------------------------------------------------------------------------
wxIMPLEMENT_DYNAMIC_CLASS(wx28HtmlEntitiesParser,wxObject);
wx28HtmlEntitiesParser::wx28HtmlEntitiesParser()
{
}
wx28HtmlEntitiesParser::~wx28HtmlEntitiesParser()
{
}
void wx28HtmlEntitiesParser::SetEncoding(wxFontEncoding encoding)
{
(void) encoding;
}
wxString wx28HtmlEntitiesParser::Parse(const wxString& input)
{
const wxChar *c, *last;
const wxChar *in_str = input.c_str();
wxString output;
for (c = in_str, last = in_str; *c != wxT('\0'); c++)
{
if (*c == wxT('&'))
{
if ( output.empty() )
output.reserve(input.length());
if (c - last > 0)
output.append(last, c - last);
if ( *++c == wxT('\0') )
break;
wxString entity;
const wxChar *ent_s = c;
wxChar entity_char;
for (; (*c >= wxT('a') && *c <= wxT('z')) ||
(*c >= wxT('A') && *c <= wxT('Z')) ||
(*c >= wxT('0') && *c <= wxT('9')) ||
*c == wxT('_') || *c == wxT('#'); c++) {}
entity.append(ent_s, c - ent_s);
if (*c != wxT(';')) c--;
last = c+1;
entity_char = GetEntityChar(entity);
if (entity_char)
output << entity_char;
else
{
output.append(ent_s-1, c-ent_s+2);
wxLogTrace(wxTRACE_HTML_DEBUG,
wxT("Unrecognized HTML entity: '%s'"),
entity.c_str());
}
}
}
if (last == in_str) // common case: no entity
return input;
if (*last != wxT('\0'))
output.append(last);
return output;
}
struct wx28HtmlEntityInfo
{
const wxChar *name;
unsigned code;
};
extern "C" int LINKAGEMODE wx28HtmlEntityCompare(const void *key, const void *item)
{
return wxStrcmp((wxChar*)key, ((wx28HtmlEntityInfo*)item)->name);
}
wxChar wx28HtmlEntitiesParser::GetEntityChar(const wxString& entity)
{
unsigned code = 0;
if (entity[0] == wxT('#'))
{
const wxChar *ent_s = entity.c_str();
const wxChar *format;
if (ent_s[1] == wxT('x') || ent_s[1] == wxT('X'))
{
format = wxT("%x");
ent_s++;
}
else
format = wxT("%u");
ent_s++;
if (wxSscanf(ent_s, format, &code) != 1)
code = 0;
}
else
{
static wx28HtmlEntityInfo substitutions[] = {
{ wxT("AElig"),198 },
{ wxT("Aacute"),193 },
{ wxT("Acirc"),194 },
{ wxT("Agrave"),192 },
{ wxT("Alpha"),913 },
{ wxT("Aring"),197 },
{ wxT("Atilde"),195 },
{ wxT("Auml"),196 },
{ wxT("Beta"),914 },
{ wxT("Ccedil"),199 },
{ wxT("Chi"),935 },
{ wxT("Dagger"),8225 },
{ wxT("Delta"),916 },
{ wxT("ETH"),208 },
{ wxT("Eacute"),201 },
{ wxT("Ecirc"),202 },
{ wxT("Egrave"),200 },
{ wxT("Epsilon"),917 },
{ wxT("Eta"),919 },
{ wxT("Euml"),203 },
{ wxT("Gamma"),915 },
{ wxT("Iacute"),205 },
{ wxT("Icirc"),206 },
{ wxT("Igrave"),204 },
{ wxT("Iota"),921 },
{ wxT("Iuml"),207 },
{ wxT("Kappa"),922 },
{ wxT("Lambda"),923 },
{ wxT("Mu"),924 },
{ wxT("Ntilde"),209 },
{ wxT("Nu"),925 },
{ wxT("OElig"),338 },
{ wxT("Oacute"),211 },
{ wxT("Ocirc"),212 },
{ wxT("Ograve"),210 },
{ wxT("Omega"),937 },
{ wxT("Omicron"),927 },
{ wxT("Oslash"),216 },
{ wxT("Otilde"),213 },
{ wxT("Ouml"),214 },
{ wxT("Phi"),934 },
{ wxT("Pi"),928 },
{ wxT("Prime"),8243 },
{ wxT("Psi"),936 },
{ wxT("Rho"),929 },
{ wxT("Scaron"),352 },
{ wxT("Sigma"),931 },
{ wxT("THORN"),222 },
{ wxT("Tau"),932 },
{ wxT("Theta"),920 },
{ wxT("Uacute"),218 },
{ wxT("Ucirc"),219 },
{ wxT("Ugrave"),217 },
{ wxT("Upsilon"),933 },
{ wxT("Uuml"),220 },
{ wxT("Xi"),926 },
{ wxT("Yacute"),221 },
{ wxT("Yuml"),376 },
{ wxT("Zeta"),918 },
{ wxT("aacute"),225 },
{ wxT("acirc"),226 },
{ wxT("acute"),180 },
{ wxT("aelig"),230 },
{ wxT("agrave"),224 },
{ wxT("alefsym"),8501 },
{ wxT("alpha"),945 },
{ wxT("amp"),38 },
{ wxT("and"),8743 },
{ wxT("ang"),8736 },
{ wxT("aring"),229 },
{ wxT("asymp"),8776 },
{ wxT("atilde"),227 },
{ wxT("auml"),228 },
{ wxT("bdquo"),8222 },
{ wxT("beta"),946 },
{ wxT("brvbar"),166 },
{ wxT("bull"),8226 },
{ wxT("cap"),8745 },
{ wxT("ccedil"),231 },
{ wxT("cedil"),184 },
{ wxT("cent"),162 },
{ wxT("chi"),967 },
{ wxT("circ"),710 },
{ wxT("clubs"),9827 },
{ wxT("cong"),8773 },
{ wxT("copy"),169 },
{ wxT("crarr"),8629 },
{ wxT("cup"),8746 },
{ wxT("curren"),164 },
{ wxT("dArr"),8659 },
{ wxT("dagger"),8224 },
{ wxT("darr"),8595 },
{ wxT("deg"),176 },
{ wxT("delta"),948 },
{ wxT("diams"),9830 },
{ wxT("divide"),247 },
{ wxT("eacute"),233 },
{ wxT("ecirc"),234 },
{ wxT("egrave"),232 },
{ wxT("empty"),8709 },
{ wxT("emsp"),8195 },
{ wxT("ensp"),8194 },
{ wxT("epsilon"),949 },
{ wxT("equiv"),8801 },
{ wxT("eta"),951 },
{ wxT("eth"),240 },
{ wxT("euml"),235 },
{ wxT("euro"),8364 },
{ wxT("exist"),8707 },
{ wxT("fnof"),402 },
{ wxT("forall"),8704 },
{ wxT("frac12"),189 },
{ wxT("frac14"),188 },
{ wxT("frac34"),190 },
{ wxT("frasl"),8260 },
{ wxT("gamma"),947 },
{ wxT("ge"),8805 },
{ wxT("gt"),62 },
{ wxT("hArr"),8660 },
{ wxT("harr"),8596 },
{ wxT("hearts"),9829 },
{ wxT("hellip"),8230 },
{ wxT("iacute"),237 },
{ wxT("icirc"),238 },
{ wxT("iexcl"),161 },
{ wxT("igrave"),236 },
{ wxT("image"),8465 },
{ wxT("infin"),8734 },
{ wxT("int"),8747 },
{ wxT("iota"),953 },
{ wxT("iquest"),191 },
{ wxT("isin"),8712 },
{ wxT("iuml"),239 },
{ wxT("kappa"),954 },
{ wxT("lArr"),8656 },
{ wxT("lambda"),955 },
{ wxT("lang"),9001 },
{ wxT("laquo"),171 },
{ wxT("larr"),8592 },
{ wxT("lceil"),8968 },
{ wxT("ldquo"),8220 },
{ wxT("le"),8804 },
{ wxT("lfloor"),8970 },
{ wxT("lowast"),8727 },
{ wxT("loz"),9674 },
{ wxT("lrm"),8206 },
{ wxT("lsaquo"),8249 },
{ wxT("lsquo"),8216 },
{ wxT("lt"),60 },
{ wxT("macr"),175 },
{ wxT("mdash"),8212 },
{ wxT("micro"),181 },
{ wxT("middot"),183 },
{ wxT("minus"),8722 },
{ wxT("mu"),956 },
{ wxT("nabla"),8711 },
{ wxT("nbsp"),160 },
{ wxT("ndash"),8211 },
{ wxT("ne"),8800 },
{ wxT("ni"),8715 },
{ wxT("not"),172 },
{ wxT("notin"),8713 },
{ wxT("nsub"),8836 },
{ wxT("ntilde"),241 },
{ wxT("nu"),957 },
{ wxT("oacute"),243 },
{ wxT("ocirc"),244 },
{ wxT("oelig"),339 },
{ wxT("ograve"),242 },
{ wxT("oline"),8254 },
{ wxT("omega"),969 },
{ wxT("omicron"),959 },
{ wxT("oplus"),8853 },
{ wxT("or"),8744 },
{ wxT("ordf"),170 },
{ wxT("ordm"),186 },
{ wxT("oslash"),248 },
{ wxT("otilde"),245 },
{ wxT("otimes"),8855 },
{ wxT("ouml"),246 },
{ wxT("para"),182 },
{ wxT("part"),8706 },
{ wxT("permil"),8240 },
{ wxT("perp"),8869 },
{ wxT("phi"),966 },
{ wxT("pi"),960 },
{ wxT("piv"),982 },
{ wxT("plusmn"),177 },
{ wxT("pound"),163 },
{ wxT("prime"),8242 },
{ wxT("prod"),8719 },
{ wxT("prop"),8733 },
{ wxT("psi"),968 },
{ wxT("quot"),34 },
{ wxT("rArr"),8658 },
{ wxT("radic"),8730 },
{ wxT("rang"),9002 },
{ wxT("raquo"),187 },
{ wxT("rarr"),8594 },
{ wxT("rceil"),8969 },
{ wxT("rdquo"),8221 },
{ wxT("real"),8476 },
{ wxT("reg"),174 },
{ wxT("rfloor"),8971 },
{ wxT("rho"),961 },
{ wxT("rlm"),8207 },
{ wxT("rsaquo"),8250 },
{ wxT("rsquo"),8217 },
{ wxT("sbquo"),8218 },
{ wxT("scaron"),353 },
{ wxT("sdot"),8901 },
{ wxT("sect"),167 },
{ wxT("shy"),173 },
{ wxT("sigma"),963 },
{ wxT("sigmaf"),962 },
{ wxT("sim"),8764 },
{ wxT("spades"),9824 },
{ wxT("sub"),8834 },
{ wxT("sube"),8838 },
{ wxT("sum"),8721 },
{ wxT("sup"),8835 },
{ wxT("sup1"),185 },
{ wxT("sup2"),178 },
{ wxT("sup3"),179 },
{ wxT("supe"),8839 },
{ wxT("szlig"),223 },
{ wxT("tau"),964 },
{ wxT("there4"),8756 },
{ wxT("theta"),952 },
{ wxT("thetasym"),977 },
{ wxT("thinsp"),8201 },
{ wxT("thorn"),254 },
{ wxT("tilde"),732 },
{ wxT("times"),215 },
{ wxT("trade"),8482 },
{ wxT("uArr"),8657 },
{ wxT("uacute"),250 },
{ wxT("uarr"),8593 },
{ wxT("ucirc"),251 },
{ wxT("ugrave"),249 },
{ wxT("uml"),168 },
{ wxT("upsih"),978 },
{ wxT("upsilon"),965 },
{ wxT("uuml"),252 },
{ wxT("weierp"),8472 },
{ wxT("xi"),958 },
{ wxT("yacute"),253 },
{ wxT("yen"),165 },
{ wxT("yuml"),255 },
{ wxT("zeta"),950 },
{ wxT("zwj"),8205 },
{ wxT("zwnj"),8204 },
{nullptr, 0}};
static size_t substitutions_cnt = 0;
if (substitutions_cnt == 0)
while (substitutions[substitutions_cnt].code != 0)
substitutions_cnt++;
wx28HtmlEntityInfo *info = nullptr;
info = (wx28HtmlEntityInfo*) bsearch(entity.c_str(), substitutions,
substitutions_cnt,
sizeof(wx28HtmlEntityInfo),
wx28HtmlEntityCompare);
if (info)
code = info->code;
}
if (code == 0)
return 0;
else
return GetCharForCode(code);
}
wxFSFile *wx28HtmlParser::OpenURL(wx28HtmlURLType WXUNUSED(type),
const wxString& url) const
{
return m_FS ? m_FS->OpenFile(url) : nullptr;
}
//-----------------------------------------------------------------------------
// wx28HtmlParser::ExtractCharsetInformation
//-----------------------------------------------------------------------------
class wxMetaTagParser : public wx28HtmlParser
{
public:
wxMetaTagParser() { }
wxObject* GetProduct() { return nullptr; }
protected:
virtual void AddText(const wxChar* WXUNUSED(txt)) {}
wxDECLARE_NO_COPY_CLASS(wxMetaTagParser);
};
class wxMetaTagHandler : public wx28HtmlTagHandler
{
public:
wxMetaTagHandler(wxString *retval) : wx28HtmlTagHandler(), m_retval(retval) {}
wxString GetSupportedTags() { return wxT("META,BODY"); }
bool HandleTag(const wx28HtmlTag& tag);
private:
wxString *m_retval;
wxDECLARE_NO_COPY_CLASS(wxMetaTagHandler);
};
bool wxMetaTagHandler::HandleTag(const wx28HtmlTag& tag)
{
if (tag.GetName() == wxT("BODY"))
{
m_Parser->StopParsing();
return false;
}
if (tag.HasParam(wxT("HTTP-EQUIV")) &&
tag.GetParam(wxT("HTTP-EQUIV")).IsSameAs(wxT("Content-Type"), false) &&
tag.HasParam(wxT("CONTENT")))
{
wxString content = tag.GetParam(wxT("CONTENT")).Lower();
if (content.Left(19) == wxT("text/html; charset="))
{
*m_retval = content.Mid(19);
m_Parser->StopParsing();
}
}
return false;
}
/*static*/
wxString wx28HtmlParser::ExtractCharsetInformation(const wxString& markup)
{
wxString charset;
wxMetaTagParser *parser = new wxMetaTagParser();
if(parser)
{
parser->AddTagHandler(new wxMetaTagHandler(&charset));
parser->Parse(markup);
delete parser;
}
return charset;
}
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