src/html/htmltag.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        htmltag.cpp
// Purpose:     wxHtmlTag class (represents single tag)
// Author:      Vaclav Slavik
// RCS-ID:      $Id$
// Copyright:   (c) 1999 Vaclav Slavik
// Licence:     wxWindows Licence
/////////////////////////////////////////////////////////////////////////////


#ifdef __GNUG__
#pragma implementation
#endif

#include "wx/wxprec.h"

#include "wx/defs.h"
#if wxUSE_HTML

#ifdef __BORDLANDC__
#pragma hdrstop
#endif

#ifndef WXPRECOMP
#include "wx/wx.h"
#endif

#include "wx/html/htmltag.h"
#include <stdio.h> // for vsscanf
#include <stdarg.h>


//-----------------------------------------------------------------------------
// wxHtmlTagsCache
//-----------------------------------------------------------------------------

struct wxHtmlCacheItem
{
    // this is "pos" value passed to wxHtmlTag's constructor.
    // it is position of '<' character of the tag
    int Key;

    // end positions for the tag:
    // end1 is '<' of ending tag,
    // end2 is '>' or both are
    // -1 if there is no ending tag for this one...
    // or -2 if this is ending tag  </...>
    int End1, End2;

    // name of this tag
    wxChar *Name;
};


IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)

#define CACHE_INCREMENT  64

wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
{
    const wxChar *src = source.c_str();
    int i, tg, pos, stpos;
    int lng = source.Length();
    wxChar dummy[256];

    m_Cache = NULL;
    m_CacheSize = 0;
    m_CachePos = 0;

    pos = 0;
    while (pos < lng)
    {
        if (src[pos] == wxT('<'))   // tag found:
	    {
            if (m_CacheSize % CACHE_INCREMENT == 0)
                m_Cache = (wxHtmlCacheItem*) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) * sizeof(wxHtmlCacheItem));
            tg = m_CacheSize++;
            m_Cache[tg].Key = stpos = pos++;
            dummy[0] = 0; i = 0;
            while (pos < lng &&
                   src[pos] != wxT('>') &&
                   src[pos] != wxT(' ') && src[pos] != wxT('\r') &&
                   src[pos] != wxT('\n') && src[pos] != wxT('\t'))
		    {
                dummy[i] = src[pos++];
                if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
                i++;
            }
            dummy[i] = 0;
            m_Cache[tg].Name = new wxChar[i+1];
            memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));

            while (pos < lng && src[pos] != wxT('>')) pos++;

            if (src[stpos+1] == wxT('/')) // ending tag:
    	    {
                m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
                // find matching begin tag:
                for (i = tg; i >= 0; i--)
                    if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0))
		            {
                        m_Cache[i].End1 = stpos;
                        m_Cache[i].End2 = pos + 1;
                        break;
                    }
            }
            else
	        {
                m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
            }
        }

        pos++;
    }

    // ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
    for (i = 0; i < m_CacheSize; i++)
    {
        delete[] m_Cache[i].Name;
        m_Cache[i].Name = NULL;
    }
}


void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
{
    if (m_Cache == NULL) return;
    if (m_Cache[m_CachePos].Key != at)
    {
        int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
        do {m_CachePos += delta;} while (m_Cache[m_CachePos].Key != at);
    }
    *end1 = m_Cache[m_CachePos].End1;
    *end2 = m_Cache[m_CachePos].End2;
}


//-----------------------------------------------------------------------------
// wxHtmlTag
//-----------------------------------------------------------------------------

IMPLEMENT_CLASS(wxHtmlTag,wxObject)

wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos, wxHtmlTagsCache* cache) : wxObject()
{
    int i;
    char c;

    // fill-in name, params and begin pos:
    m_Name = m_Params = wxEmptyString;
    i = pos+1;
    if (source[i] == '/') { m_Ending = TRUE; i++; }
    else m_Ending = FALSE;

    // find tag's name and convert it to uppercase:
    while ((i < end_pos) &&
               ((c = source[i++]) != ' ' && c != '\r' && c != '\n' && c != '\t' &&
                c != '>'))
	{
        if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
        m_Name += c;
    }

    // if the tag has parameters, read them and "normalize" them,
    // i.e. convert to uppercase, replace whitespaces by spaces and
    // remove whitespaces around '=':
    if (source[i-1] != '>')
        while ((i < end_pos) && ((c = source[i++]) != '>'))
	    {
            if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
            if (c == '\r' || c == '\n' || c == '\t') c = ' '; // make future parsing a bit simpler
            m_Params += c;
            if (c == '"')
	        {
                // remove spaces around the '=' character:
                if (m_Params.Length() > 1 &&
                    m_Params[m_Params.Length()-2] == ' ')
                {
                    m_Params.RemoveLast();
                    while (m_Params.Length() > 0 && m_Params.Last() == ' ')
                        m_Params.RemoveLast();
                    m_Params += '"';
                }
                while ((i < end_pos) && (source[i++] == ' ')) {}
                if (i < end_pos) i--;

                // ...and copy the value to m_Params:
                while ((i < end_pos) && ((c = source[i++]) != '"')) m_Params += c;
                m_Params += c;
            }
            else if (c == '\'')
	        {
                while ((i < end_pos) && ((c = source[i++]) != '\'')) m_Params += c;
                m_Params += c;
            }
        }
   m_Begin = i;

   cache->QueryTag(pos, &m_End1, &m_End2);
   if (m_End1 > end_pos) m_End1 = end_pos;
   if (m_End2 > end_pos) m_End2 = end_pos;
}


bool wxHtmlTag::HasParam(const wxString& par) const
{
    const wxChar *st = m_Params, *p = par;
    const wxChar *st2, *p2;

    if (*st == 0) return FALSE;
    if (*p == 0) return FALSE;
    for (st2 = st, p2 = p; ; st2++)
    {
        if (*p2 == 0) return TRUE;
        if (*st2 == 0) return FALSE;
        if (*p2 != *st2) p2 = p;
        if (*p2 == *st2) p2++;
        if (*st2 == ' ') p2 = p;
        else if (*st2 == '=')
	    {
            p2 = p;
            while (*st2 != ' ')
	        {
                if (*st2 == '"')
		        {
                    st2++;
                    while (*st2 != '"') st2++;
                }
                st2++;
                if (*st2 == 0) return FALSE;
            }
        }
    }
}


wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
{
    const wxChar *st = m_Params, *p = par;
    const wxChar *st2, *p2;
    bool comma;
    char comma_char;

    if (*st == 0) return "";
    if (*p == 0) return "";
    for (st2 = st, p2 = p; ; st2++)
    {
        if (*p2 == 0)  // found
	    {
            wxString fnd = "";
            st2++; // '=' character
            comma = FALSE;
    	    comma_char = '\0';
            if (!with_commas && (*(st2) == '"'))
	        {
    	        st2++;
        		comma = TRUE;
        		comma_char = '"';
	        }
    	    else if (!with_commas && (*(st2) == '\''))
	        {
    	        st2++;
    	    	comma = TRUE;
        		comma_char = '\'';
    	    }

            while (*st2 != 0)
	        {
                if (comma && *st2 == comma_char) comma = FALSE;
                else if ((*st2 == ' ') && (!comma)) break;
                fnd += (*(st2++));
            }
            if (!with_commas && (*(st2-1) == comma_char)) fnd.RemoveLast();
            return fnd;
        }
        if (*st2 == 0) return "";
        if (*p2 != *st2) p2 = p;
        if (*p2 == *st2) p2++;
        if (*st2 == ' ') p2 = p;
        else if (*st2 == '=')
	    {
            p2 = p;
            while (*st2 != ' ')
	        {
                if (*st2 == '"')
		        {
                    st2++;
                    while (*st2 != '"') st2++;
                }
                else if (*st2 == '\'')
		        {
                    st2++;
                    while (*st2 != '\'') st2++;
                }
                st2++;
            }
        }
    }
}


int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
{
    wxString parval = GetParam(par);
    return wxSscanf((const wxChar*)parval, format, param);
}

#endif
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: htmltag.cpp
	3	// Purpose: wxHtmlTag class (represents single tag)
	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/html/htmltag.h"
	29	#include <stdio.h> // for vsscanf
	30	#include <stdarg.h>
	31
	32
	33	//-----------------------------------------------------------------------------
	34	// wxHtmlTagsCache
	35	//-----------------------------------------------------------------------------
	36
	37	struct wxHtmlCacheItem
	38	{
	39	// this is "pos" value passed to wxHtmlTag's constructor.
	40	// it is position of '<' character of the tag
	41	int Key;
	42
	43	// end positions for the tag:
	44	// end1 is '<' of ending tag,
	45	// end2 is '>' or both are
	46	// -1 if there is no ending tag for this one...
	47	// or -2 if this is ending tag </...>
	48	int End1, End2;
	49
	50	// name of this tag
	51	wxChar *Name;
	52	};
	53
	54
	55	IMPLEMENT_CLASS(wxHtmlTagsCache,wxObject)
	56
	57	#define CACHE_INCREMENT 64
	58
	59	wxHtmlTagsCache::wxHtmlTagsCache(const wxString& source)
	60	{
	61	const wxChar *src = source.c_str();
	62	int i, tg, pos, stpos;
	63	int lng = source.Length();
	64	wxChar dummy[256];
	65
	66	m_Cache = NULL;
	67	m_CacheSize = 0;
	68	m_CachePos = 0;
	69
	70	pos = 0;
	71	while (pos < lng)
	72	{
	73	if (src[pos] == wxT('<')) // tag found:
	74	{
	75	if (m_CacheSize % CACHE_INCREMENT == 0)
	76	m_Cache = (wxHtmlCacheItem) realloc(m_Cache, (m_CacheSize + CACHE_INCREMENT) sizeof(wxHtmlCacheItem));
	77	tg = m_CacheSize++;
	78	m_Cache[tg].Key = stpos = pos++;
	79	dummy[0] = 0; i = 0;
	80	while (pos < lng &&
	81	src[pos] != wxT('>') &&
	82	src[pos] != wxT(' ') && src[pos] != wxT('\r') &&
	83	src[pos] != wxT('\n') && src[pos] != wxT('\t'))
	84	{
	85	dummy[i] = src[pos++];
	86	if ((dummy[i] >= wxT('a')) && (dummy[i] <= wxT('z'))) dummy[i] -= (wxT('a') - wxT('A'));
	87	i++;
	88	}
	89	dummy[i] = 0;
	90	m_Cache[tg].Name = new wxChar[i+1];
	91	memcpy(m_Cache[tg].Name, dummy, (i+1)*sizeof(wxChar));
	92
	93	while (pos < lng && src[pos] != wxT('>')) pos++;
	94
	95	if (src[stpos+1] == wxT('/')) // ending tag:
	96	{
	97	m_Cache[tg].End1 = m_Cache[tg].End2 = -2;
	98	// find matching begin tag:
	99	for (i = tg; i >= 0; i--)
	100	if ((m_Cache[i].End1 == -1) && (wxStrcmp(m_Cache[i].Name, dummy+1) == 0))
	101	{
	102	m_Cache[i].End1 = stpos;
	103	m_Cache[i].End2 = pos + 1;
	104	break;
	105	}
	106	}
	107	else
	108	{
	109	m_Cache[tg].End1 = m_Cache[tg].End2 = -1;
	110	}
	111	}
	112
	113	pos++;
	114	}
	115
	116	// ok, we're done, now we'll free .Name members of cache - we don't need it anymore:
	117	for (i = 0; i < m_CacheSize; i++)
	118	{
	119	delete[] m_Cache[i].Name;
	120	m_Cache[i].Name = NULL;
	121	}
	122	}
	123
	124
	125
	126	void wxHtmlTagsCache::QueryTag(int at, int* end1, int* end2)
	127	{
	128	if (m_Cache == NULL) return;
	129	if (m_Cache[m_CachePos].Key != at)
	130	{
	131	int delta = (at < m_Cache[m_CachePos].Key) ? -1 : 1;
	132	do {m_CachePos += delta;} while (m_Cache[m_CachePos].Key != at);
	133	}
	134	*end1 = m_Cache[m_CachePos].End1;
	135	*end2 = m_Cache[m_CachePos].End2;
	136	}
	137
	138
	139
	140
	141	//-----------------------------------------------------------------------------
	142	// wxHtmlTag
	143	//-----------------------------------------------------------------------------
	144
	145	IMPLEMENT_CLASS(wxHtmlTag,wxObject)
	146
	147	wxHtmlTag::wxHtmlTag(const wxString& source, int pos, int end_pos, wxHtmlTagsCache* cache) : wxObject()
	148	{
	149	int i;
	150	char c;
	151
	152	// fill-in name, params and begin pos:
	153	m_Name = m_Params = wxEmptyString;
	154	i = pos+1;
	155	if (source[i] == '/') { m_Ending = TRUE; i++; }
	156	else m_Ending = FALSE;
	157
	158	// find tag's name and convert it to uppercase:
	159	while ((i < end_pos) &&
	160	((c = source[i++]) != ' ' && c != '\r' && c != '\n' && c != '\t' &&
	161	c != '>'))
	162	{
	163	if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
	164	m_Name += c;
	165	}
	166
	167	// if the tag has parameters, read them and "normalize" them,
	168	// i.e. convert to uppercase, replace whitespaces by spaces and
	169	// remove whitespaces around '=':
	170	if (source[i-1] != '>')
	171	while ((i < end_pos) && ((c = source[i++]) != '>'))
	172	{
	173	if ((c >= 'a') && (c <= 'z')) c -= ('a' - 'A');
	174	if (c == '\r' \|\| c == '\n' \|\| c == '\t') c = ' '; // make future parsing a bit simpler
	175	m_Params += c;
	176	if (c == '"')
	177	{
	178	// remove spaces around the '=' character:
	179	if (m_Params.Length() > 1 &&
	180	m_Params[m_Params.Length()-2] == ' ')
	181	{
	182	m_Params.RemoveLast();
	183	while (m_Params.Length() > 0 && m_Params.Last() == ' ')
	184	m_Params.RemoveLast();
	185	m_Params += '"';
	186	}
	187	while ((i < end_pos) && (source[i++] == ' ')) {}
	188	if (i < end_pos) i--;
	189
	190	// ...and copy the value to m_Params:
	191	while ((i < end_pos) && ((c = source[i++]) != '"')) m_Params += c;
	192	m_Params += c;
	193	}
	194	else if (c == '\'')
	195	{
	196	while ((i < end_pos) && ((c = source[i++]) != '\'')) m_Params += c;
	197	m_Params += c;
	198	}
	199	}
	200	m_Begin = i;
	201
	202	cache->QueryTag(pos, &m_End1, &m_End2);
	203	if (m_End1 > end_pos) m_End1 = end_pos;
	204	if (m_End2 > end_pos) m_End2 = end_pos;
	205	}
	206
	207
	208
	209	bool wxHtmlTag::HasParam(const wxString& par) const
	210	{
	211	const wxChar st = m_Params, p = par;
	212	const wxChar st2, p2;
	213
	214	if (*st == 0) return FALSE;
	215	if (*p == 0) return FALSE;
	216	for (st2 = st, p2 = p; ; st2++)
	217	{
	218	if (*p2 == 0) return TRUE;
	219	if (*st2 == 0) return FALSE;
	220	if (p2 != st2) p2 = p;
	221	if (p2 == st2) p2++;
	222	if (*st2 == ' ') p2 = p;
	223	else if (*st2 == '=')
	224	{
	225	p2 = p;
	226	while (*st2 != ' ')
	227	{
	228	if (*st2 == '"')
	229	{
	230	st2++;
	231	while (*st2 != '"') st2++;
	232	}
	233	st2++;
	234	if (*st2 == 0) return FALSE;
	235	}
	236	}
	237	}
	238	}
	239
	240
	241
	242	wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
	243	{
	244	const wxChar st = m_Params, p = par;
	245	const wxChar st2, p2;
	246	bool comma;
	247	char comma_char;
	248
	249	if (*st == 0) return "";
	250	if (*p == 0) return "";
	251	for (st2 = st, p2 = p; ; st2++)
	252	{
	253	if (*p2 == 0) // found
	254	{
	255	wxString fnd = "";
	256	st2++; // '=' character
	257	comma = FALSE;
	258	comma_char = '\0';
	259	if (!with_commas && (*(st2) == '"'))
	260	{
	261	st2++;
	262	comma = TRUE;
	263	comma_char = '"';
	264	}
	265	else if (!with_commas && (*(st2) == '\''))
	266	{
	267	st2++;
	268	comma = TRUE;
	269	comma_char = '\'';
	270	}
	271
	272	while (*st2 != 0)
	273	{
	274	if (comma && *st2 == comma_char) comma = FALSE;
	275	else if ((*st2 == ' ') && (!comma)) break;
	276	fnd += (*(st2++));
	277	}
	278	if (!with_commas && (*(st2-1) == comma_char)) fnd.RemoveLast();
	279	return fnd;
	280	}
	281	if (*st2 == 0) return "";
	282	if (p2 != st2) p2 = p;
	283	if (p2 == st2) p2++;
	284	if (*st2 == ' ') p2 = p;
	285	else if (*st2 == '=')
	286	{
	287	p2 = p;
	288	while (*st2 != ' ')
	289	{
	290	if (*st2 == '"')
	291	{
	292	st2++;
	293	while (*st2 != '"') st2++;
	294	}
	295	else if (*st2 == '\'')
	296	{
	297	st2++;
	298	while (*st2 != '\'') st2++;
	299	}
	300	st2++;
	301	}
	302	}
	303	}
	304	}
	305
	306
	307
	308	int wxHtmlTag::ScanParam(const wxString& par, wxChar format, void param) const
	309	{
	310	wxString parval = GetParam(par);
	311	return wxSscanf((const wxChar*)parval, format, param);
	312	}
	313
	314	#endif