htmlparser.cpp

ecos实时嵌入式操作系统

{
    return Matches(wxT("</"));
}

bool wxSimpleHtmlParser::IsComment()
{
    return Matches(wxT("<!--"));
}

bool wxSimpleHtmlParser::IsDirective()
{
    return Matches(wxT("<!"));
}

bool wxSimpleHtmlParser::IsString()
{
    return (GetChar(m_pos) == (int) '"') ;
}

bool wxSimpleHtmlParser::IsWord()
{
    return (IsAlpha(GetChar(m_pos)));
}

bool wxSimpleHtmlParser::IsTagStartBracket(int ch)
{
    return (ch == wxT('<'));
}

bool wxSimpleHtmlParser::IsTagEndBracket(int ch)
{
    return (ch == wxT('>'));
}

bool wxSimpleHtmlParser::IsWhitespace(int ch)
{
    return ((ch == 13) || (ch == 10) || (ch == 32) || (ch == (int) '\t')) ;
}

bool wxSimpleHtmlParser::IsAlpha(int ch)
{
    return (wxIsalpha((wxChar) ch) != 0);
}

bool wxSimpleHtmlParser::IsWordChar(int ch)
{
    return (wxIsalpha((wxChar) ch) != 0 || ch == wxT('-') || ch == wxT('_') || IsNumeric(ch));
}

bool wxSimpleHtmlParser::IsNumeric(int ch)
{
    return (wxIsdigit((wxChar) ch) != 0 || ch == wxT('-') || ch == wxT('.')) ;
}

// Matches this string (case insensitive)
bool wxSimpleHtmlParser::Matches(const wxString& tok, bool eatIt)
{
    wxString text(m_text.Mid(m_pos, tok.Length()));
    bool success = (text.CmpNoCase(tok) == 0) ;
    if (success && eatIt)
    {
        m_pos += tok.Length();
    }
    return success;
}

// Safe way of getting a character
int wxSimpleHtmlParser::GetChar(size_t i) const
{
    if (i >= m_length)
        return -1;
    return m_text[i];
}

void wxSimpleHtmlParser::Clear()
{
    if (m_topLevel)
        delete m_topLevel;
    m_topLevel = NULL;
    m_text = wxEmptyString;
    m_pos = 0;
    m_length = 0;
}

// Write this file
void wxSimpleHtmlParser::Write(wxOutputStream& stream)
{
    if (m_topLevel)
        m_topLevel->Write(stream);
}

bool wxSimpleHtmlParser::WriteFile(wxString& filename)
{
    wxFileOutputStream fstream(filename);
    if (fstream.Ok())
    {
        Write(fstream);
        return TRUE;
    }
    else
        return FALSE;
}

/*
 * wxSimpleHtmlTag
 * Representation of a tag or chunk of text
 */

wxSimpleHtmlTag::wxSimpleHtmlTag(const wxString& tagName, int tagType)
{
    m_name = tagName;
    m_type = tagType;
    m_attributes = NULL;
    m_children = NULL;
    m_parent = NULL;
    m_next = NULL;
}

wxSimpleHtmlTag::~wxSimpleHtmlTag()
{
    ClearAttributes();
    ClearChildren();
}

//// Operations
void wxSimpleHtmlTag::ClearAttributes()
{
    if (m_attributes)
    {
        wxSimpleHtmlAttribute* attr = m_attributes;
        while (attr)
        {
            wxSimpleHtmlAttribute* next = attr->m_next;

            attr->m_next = NULL;
            delete attr;
            attr = next;
        }
        m_attributes = NULL;
    }
}

wxSimpleHtmlAttribute* wxSimpleHtmlTag::FindAttribute(const wxString& name) const
{
    wxSimpleHtmlAttribute* attr = m_attributes;
    while (attr)
    {
        if (attr->GetName().CmpNoCase(name) == 0)
        {
            return attr;
        }
        attr = attr->m_next;
    }
    return NULL;
}

void wxSimpleHtmlTag::AppendAttribute(const wxString& name, const wxString& value)
{
    wxSimpleHtmlAttribute* attr = new wxSimpleHtmlAttribute(name, value);
    if (m_attributes)
    {
        // Find tail
        wxSimpleHtmlAttribute* last = m_attributes;
        while (last->m_next)
            last = last->m_next;

        last->m_next = attr;
    }
    else
        m_attributes = attr;
}

void wxSimpleHtmlTag::ClearChildren()
{
    if (m_children)
    {
        wxSimpleHtmlTag* child = m_children;
        while (child)
        {
            wxSimpleHtmlTag* next = child->m_next;

            child->m_next = NULL;
            delete child;
            child = next;
        }
        m_children = NULL;
    }
}

void wxSimpleHtmlTag::AppendTag(wxSimpleHtmlTag* tag)
{
    if (m_children)
    {
        // Find tail
        wxSimpleHtmlTag* last = m_children;
        while (last->m_next)
            last = last->m_next;

        last->m_next = tag;
        tag->m_parent = this;
    }
    else
        m_children = tag;
}

// Gets the text from this tag and its descendants
wxString wxSimpleHtmlTag::GetTagText()
{
    wxString text;
    if (m_children)
    {
        wxSimpleHtmlTag* tag = m_children;
        while (tag)
        {
            text += tag->GetTagText();
            tag = tag->m_next;
        }
        return text;
    }
    else if (GetType() == wxSimpleHtmlTag_Text)
        return GetText();
    else
        return wxEmptyString;
}

int wxSimpleHtmlTag::GetAttributeCount() const
{
    int count = 0;
    wxSimpleHtmlAttribute* attr = m_attributes;
    while (attr)
    {
        count ++;
        attr = attr->m_next;
    }
    return count;
}

wxSimpleHtmlAttribute* wxSimpleHtmlTag::GetAttribute(int i) const
{
    int count = 0;
    wxSimpleHtmlAttribute* attr = m_attributes;
    while (attr)
    {
        if (count == i)
            return attr;
        count ++;
        attr = attr->m_next;
    }
    return NULL;
}

int wxSimpleHtmlTag::GetChildCount() const
{
    int count = 0;
    wxSimpleHtmlTag* tag = m_children;
    while (tag)
    {
        count ++;
        tag = tag->m_next;
    }
    return count;
}

bool wxSimpleHtmlTag::HasAttribute(const wxString& name, const wxString& value) const
{
    wxSimpleHtmlAttribute* attr = FindAttribute(name);

    return (attr && (attr->GetValue().CmpNoCase(value) == 0)) ;
}

bool wxSimpleHtmlTag::HasAttribute(const wxString& name) const
{
    return FindAttribute(name) != NULL ;
}

bool wxSimpleHtmlTag::GetAttributeValue(wxString& value, const wxString& attrName)
{
    wxSimpleHtmlAttribute* attr = FindAttribute(attrName);
    if (attr)
    {
        value = attr->GetValue();
        return TRUE;
    }
    else
        return FALSE;
}

// Search forward from this tag until we find a tag with this name & attribute 
wxSimpleHtmlTag* wxSimpleHtmlTag::FindTag(const wxString& tagName, const wxString& attrName)
{
    wxSimpleHtmlTag* tag = m_next;
    while (tag)
    {
        if (tag->NameIs(tagName) && tag->FindAttribute(attrName))
            return tag;

        tag = tag->m_next;
    }
    return NULL;
}

bool wxSimpleHtmlTag::FindTextUntilTagClose(wxString& text, const wxString& tagName)
{
    wxSimpleHtmlTag* tag = this;
    while (tag)
    {
        if (tag->GetType() == wxSimpleHtmlTag_Close && tag->NameIs(tagName))
            return TRUE;

        if (tag->GetType() == wxSimpleHtmlTag_Text)
            text += tag->GetText();

        tag = tag->m_next;
    }
    return TRUE;
}


wxSimpleHtmlTag* wxSimpleHtmlTag::GetChild(int i) const
{
    int count = 0;
    wxSimpleHtmlTag* tag = m_children;
    while (tag)
    {
        if (count == i)
            return tag;

        count ++;
        tag = tag->m_next;
    }
    return NULL;
}

void wxSimpleHtmlTag::Write(wxOutputStream& stream)
{
    switch (GetType())
    {
    case wxSimpleHtmlTag_Text:
        {
            stream << m_text;
            break;
        }
    case wxSimpleHtmlTag_Open:
        {
            stream << "<" << m_name;
            if (GetAttributeCount() > 0)
                stream << " ";
            int i;
            for (i = 0; i < GetAttributeCount(); i++)
            {
                wxSimpleHtmlAttribute* attr = GetAttribute(i);
                attr->Write(stream);
                if (i < GetAttributeCount() - 1)
                    stream << " ";
            }
            stream << ">\n";
            break;
        }
    case wxSimpleHtmlTag_Directive:
        {
            stream << "<!" << m_name << " ";
            int i;
            for (i = 0; i < GetAttributeCount(); i++)
            {
                wxSimpleHtmlAttribute* attr = GetAttribute(i);
                attr->Write(stream);
                if (i < GetAttributeCount() - 1)
                    stream << " ";
            }
            stream << ">\n";
            break;
        }
    case wxSimpleHtmlTag_Close:
        {
            stream << "</" << m_name << ">\n";
            break;
        }
    default:
        {
            break;
        }
    }
    wxSimpleHtmlTag* tag = m_children;
    while (tag)
    {
        tag->Write(stream);
        tag = tag->m_next;
    }

}

void wxSimpleHtmlAttribute::Write(wxOutputStream& stream)
{
    if (m_value.IsEmpty())
        stream << m_name;
    else
    {
        stream << m_name;
        stream << "=\"";
        stream << m_value;
        stream << "\"";
    }
}