xml_writer.cpp

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#include "precomp.h"
#include "xml_writer.h"
#include "xml_token_save.h"
#include "string_help.h"
#include "string_format.h"
#include "xml_writer_generic.h"

static std::string insert_escapes_fast(std::string str);

// CL_XMLWriter construction:

CL_XMLWriter::CL_XMLWriter()
{
}

CL_XMLWriter::CL_XMLWriter(const CL_XMLWriter &copy) : impl(copy.impl)
{
}

CL_XMLWriter::CL_XMLWriter(CL_IODevice *output, bool delete_output) : impl(new CL_XMLWriter_Generic)
{
        impl->output = output;
        impl->delete_output = delete_output;
}

CL_XMLWriter::~CL_XMLWriter()
{
}

// CL_XMLWriter attributes:

bool CL_XMLWriter::get_insert_whitespace() const
{
        return impl->insert_whitespace;
}

void CL_XMLWriter::set_insert_whitespace(bool enable)
{
        impl->insert_whitespace = enable;
}

// CL_XMLWriter operations:

void CL_XMLWriter::write(const CL_XMLTokenSave &token)
{
        if (!impl) return;

        std::string str;
        switch (token.get_type())
        {
        case CL_XMLToken::NULL_TOKEN:
                return; // should this throw exception instead?
                
        case CL_XMLToken::ELEMENT_TOKEN:
                if (token.get_variant() == CL_XMLToken::END)
                {
                        str = cl_format("</%1>", insert_escapes_fast(token.get_name()));
                }
                else
                {
                        str = cl_format("<%1", insert_escapes_fast(token.get_name()));

                        int size = token.get_attributes_number();
                        for (int i=0; i<size; i++)
                        {
                                std::pair<std::string, std::string> attribute(token.get_attribute(i));
                                str.append(cl_format(" %1=\"%2\"", insert_escapes_fast(attribute.first), insert_escapes_fast(attribute.second)));
                        }

                        if (token.get_variant() == CL_XMLToken::SINGLE)
                                str.append("/>");
                        else
                                str.append(">");
                }
                break;
                
        case CL_XMLToken::TEXT_TOKEN:
                str = insert_escapes_fast(token.get_value());
                break;
                
        case CL_XMLToken::CDATA_SECTION_TOKEN:
                str = cl_format("<!CDATA[%1]]>", token.get_value());
                break;

        case CL_XMLToken::COMMENT_TOKEN:
                str = cl_format("<!--%1-->", token.get_value());
                break;

        case CL_XMLToken::ENTITY_REFERENCE_TOKEN:
        case CL_XMLToken::ENTITY_TOKEN:
        case CL_XMLToken::PROCESSING_INSTRUCTION_TOKEN:
        case CL_XMLToken::DOCUMENT_TYPE_TOKEN:
        case CL_XMLToken::NOTATION_TOKEN:
                return; // not implemented yet.
        }

        if (token.get_variant() == CL_XMLToken::END)
        {
                impl->indent--;
        }

        if (impl->insert_whitespace)
        {
                std::string indent_tabs(impl->indent, '\t');
                impl->output->send(indent_tabs.data(), (int) indent_tabs.size());
        }

        impl->output->send(str.data(), (int) str.size());

        if (impl->insert_whitespace)
        {
#ifdef WIN32
                impl->output->send("\r\n", 2);
#else
                impl->output->send("\n", 2);
#endif
        }

        if (token.get_variant() == CL_XMLToken::BEGIN)
        {
                impl->indent++;
        }
}
        
// CL_XMLWriter implementation:

static std::string insert_escapes_fast(std::string str)
{
        static std::string const amp("&amp;");
        static std::string const quot("&quot;");
        static std::string const apos("&apos;");
        static std::string const lt("&lt;");
        static std::string const gt("&gt;");

        std::string::size_type pos = 0;
        while (pos < str.size())
        {
                switch(str[pos])
                {
                case '&':
                        str.replace(pos, 1, amp);
                        pos += amp.size();
                        break;
                case '\'':
                        str.replace(pos, 1, apos);
                        pos += apos.size();
                        break;
                case '\"':
                        str.replace(pos, 1, quot);
                        pos += quot.size();
                        break;
                case '<':
                        str.replace(pos, 1, lt);
                        pos += lt.size();
                        break;
                case '>':
                        str.replace(pos, 1, gt);
                        pos += gt.size();
                        break;
                default:
                        ++pos;
                        break;
                }
        }
        return str;
}

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