sax_parser_base.hpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#ifndef INCLUDED_ORCUS_SAX_PARSER_BASE_HPP
#define INCLUDED_ORCUS_SAX_PARSER_BASE_HPP
 
#include "env.hpp"
#include "cell_buffer.hpp"
#include "parser_global.hpp"
#include "parser_base.hpp"
 
#include <cassert>
#include <cstdlib>
#include <exception>
#include <sstream>
#include <memory>
 
#define ORCUS_DEBUG_SAX_PARSER 0
 
#if ORCUS_DEBUG_SAX_PARSER
#include <iostream>
using std::cout;
using std::endl;
#endif
 
namespace orcus { namespace sax {

struct doctype_declaration
{
    enum class keyword_type { dtd_public, dtd_private };
 
    keyword_type keyword;
    std::string_view root_element;
    std::string_view fpi;
    std::string_view uri;
};

ORCUS_PSR_DLLPUBLIC char decode_xml_encoded_char(const char* p, size_t n);

ORCUS_PSR_DLLPUBLIC std::string decode_xml_unicode_char(const char* p, size_t n);

struct parser_element
{
    std::string_view ns;
    std::string_view name;
    std::ptrdiff_t begin_pos;
    std::ptrdiff_t end_pos;
};

struct parser_attribute
{
    std::string_view ns;
    std::string_view name;
    std::string_view value;
    bool transient;
};
 
class ORCUS_PSR_DLLPUBLIC parser_base : public ::orcus::parser_base
{
    struct impl;
    std::unique_ptr<impl> mp_impl;
 
    parser_base() = delete;
    parser_base(const parser_base&) = delete;
    parser_base& operator=(const parser_base&) = delete;
protected:
    size_t m_nest_level;
    size_t m_buffer_pos;
    bool m_root_elem_open:1;
 
protected:
    parser_base(const char* content, size_t size);
    ~parser_base();
 
    void next_check()
    {
        next();
        if (!has_char())
            throw malformed_xml_error("xml stream ended prematurely.", offset());
    }
 
    void nest_up() { ++m_nest_level; }
    void nest_down()
    {
        if (m_nest_level == 0)
            throw malformed_xml_error("incorrect nesting in xml stream", offset());
 
        --m_nest_level;
    }
 
    void inc_buffer_pos();
    void reset_buffer_pos() { m_buffer_pos = 0; }
 
    void has_char_throw(const char* msg) const
    {
        if (!has_char())
            throw malformed_xml_error(msg, offset());
    }
 
    char cur_char_checked() const
    {
        if (!has_char())
            throw malformed_xml_error("xml stream ended prematurely.", offset());
 
        return *mp_char;
    }
 
    char next_and_char()
    {
        next();
#if ORCUS_DEBUG_SAX_PARSER
        if (mp_char >= mp_end)
            throw malformed_xml_error("xml stream ended prematurely.", offset());
#endif
        return *mp_char;
    }
 
    char next_char_checked()
    {
        next();
        if (!has_char())
            throw malformed_xml_error("xml stream ended prematurely.", offset());
 
        return *mp_char;
    }
 
    cell_buffer& get_cell_buffer();
 
    void comment();
 
    void expects_next(const char* p, size_t n);
 
    void parse_encoded_char(cell_buffer& buf);
    void value_with_encoded_char(cell_buffer& buf, std::string_view& str, char quote_char);

    bool value(std::string_view& str, bool decode);
 
    void name(std::string_view& str);
    void element_name(parser_element& elem, std::ptrdiff_t begin_pos);
    void attribute_name(std::string_view& attr_ns, std::string_view& attr_name);
    void characters_with_encoded_char(cell_buffer& buf);
};
 
}}
 
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */