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/* messageattribute.cpp
* Copyright (C) 2003 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <tnt/messageattribute.h>
#include <cctype>
#include <iostream>
namespace tnt
{
namespace
{
static inline bool istokenchar(char ch)
{
return ch >= 33
&& ch <= 126
&& ch != '(' && ch != ')' && ch != '<' && ch != '>' && ch != '@'
&& ch != ',' && ch != ';' && ch != ':' && ch != '\\' && ch != '"'
&& ch != '/' && ch != '[' && ch != ']' && ch != '?' && ch != '=';
}
static inline bool tnt_isblank(char ch)
{
return ch == ' ' || ch == '\t';
}
}
void MessageattributeParser::parse(std::istream& in)
{
enum state_type
{
state_0,
state_type0,
state_type_sp,
state_subtype0,
state_subtype,
state_subtype_sp,
state_attribute0,
state_attribute,
state_attribute_sp,
state_value0,
state_value,
state_qvalue,
state_end
};
state_type state = state_0;
std::streambuf* buf = in.rdbuf();
std::string type, subtype, attribute, value;
while (state != state_end && buf->sgetc() != std::ios::traits_type::eof())
{
char ch = buf->sgetc();
switch (state)
{
case state_0:
if (istokenchar(ch))
{
type.clear();
type.reserve(16);
type += ch;
state = state_type0;
}
else if (std::isspace(ch))
in.setstate(std::ios::failbit);
break;
case state_type0:
if (tnt_isblank(ch))
state = state_type_sp;
else if (ch == '/')
state = state_subtype0;
else if (ch == ';')
{
switch (onType(type, std::string()))
{
case OK: state = state_attribute0; break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else if (istokenchar(ch))
type += ch;
else
in.setstate(std::ios::failbit);
break;
case state_type_sp:
if (ch == '/')
state = state_subtype0;
else if (ch == ';')
{
switch (onType(type, std::string()))
{
case OK: state = state_attribute0; break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else if (!tnt_isblank(ch))
in.setstate(std::ios::failbit);
break;
case state_subtype0:
if (istokenchar(ch))
{
subtype = ch;
state = state_subtype;
}
else if (!tnt_isblank(ch))
in.setstate(std::ios::failbit);
break;
case state_subtype:
if (ch == ';')
{
switch (onType(type, subtype))
{
case OK: state = state_attribute0; break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else if (tnt_isblank(ch))
{
switch (onType(type, subtype))
{
case OK: state = state_subtype_sp; break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else if (istokenchar(ch))
subtype += ch;
else
in.setstate(std::ios::failbit);
break;
case state_subtype_sp:
if (ch == ';')
state = state_attribute0;
else if (!tnt_isblank(ch))
state = state_end;
break;
case state_attribute0:
if (istokenchar(ch))
{
attribute = ch;
state = state_attribute;
}
break;
case state_attribute:
if (istokenchar(ch))
attribute += ch;
else if (tnt_isblank(ch))
state = state_attribute_sp;
else if (ch == '=')
state = state_value0;
else
in.setstate(std::ios::failbit);
break;
case state_attribute_sp:
if (ch == '=')
state = state_value0;
else if (!tnt_isblank(ch))
in.setstate(std::ios::failbit);
break;
case state_value0:
if (ch == '"')
state = state_qvalue;
else if (istokenchar(ch))
{
value.clear();
value.reserve(16);
value += ch;
state = state_value;
}
else
in.setstate(std::ios::failbit);
break;
case state_qvalue:
if (ch == '"')
{
switch (onParameter(attribute, value))
{
case OK: state = state_subtype_sp;
attribute.clear();
value.clear();
break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else
value += ch;
break;
case state_value:
if (istokenchar(ch))
value += ch;
else if (tnt_isblank(ch))
{
switch (onParameter(attribute, value))
{
case OK: state = state_subtype_sp;
attribute.clear();
value.clear();
break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else if (ch == ';')
{
switch (onParameter(attribute, value))
{
case OK: state = state_attribute0;
attribute.clear();
value.clear();
break;
case FAIL: in.setstate(std::ios::failbit); break;
case END: state = state_end; break;
}
}
else
in.setstate(std::ios::failbit);
break;
case state_end:
break;
}
if (state != state_end)
buf->sbumpc();
}
// process last parameter
if (in.fail())
return;
switch (state)
{
case state_0:
case state_type0:
break;
case state_type_sp:
case state_subtype0:
case state_subtype:
if (onType(type, subtype) == FAIL)
in.setstate(std::ios::failbit);
break;
case state_subtype_sp:
case state_attribute0:
break;
case state_attribute:
case state_attribute_sp:
case state_value0:
case state_qvalue:
in.setstate(std::ios::failbit);
break;
case state_value:
if(onParameter(attribute, value) == FAIL)
in.setstate(std::ios::failbit);
break;
case state_end:
break;
};
if (buf->sgetc() == std::ios::traits_type::eof())
in.setstate(std::ios::eofbit);
}
}
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