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/*
Copyright (c) 2006 Gábor Lehel <illissius@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "expression.h"
ExpressionParser::ExpressionParser( const TQString &expression )
: m_expression( expression )
, m_state( ExpectMinus )
, m_haveGroup( false )
, m_inQuote( false )
, m_inOrGroup( false )
{ }
ParsedExpression ExpressionParser::parse()
{
const uint length = m_expression.length();
for( uint pos = 0; pos < length; ++pos )
parseChar( m_expression.constref( pos ) );
finishedToken();
finishedOrGroup();
return m_parsed;
}
ParsedExpression ExpressionParser::parse( const TQString &expression ) //static
{
ExpressionParser p( expression );
return p.parse();
}
bool ExpressionParser::isAdvancedExpression( const TQString &expression ) //static
{
return ( expression.contains( '"' ) ||
expression.contains( ':' ) ||
expression.contains( '-' ) ||
expression.contains( "AND" ) ||
expression.contains( "OR" ) );
}
/* PRIVATE */
void ExpressionParser::parseChar( const TQChar &c )
{
if( m_inQuote && c != '"' )
m_string += c;
else if( c.isSpace() )
handleSpace( c );
else if( c == '-' )
handleMinus( c );
else if( c == ':' )
handleColon( c );
else if( c == '>' || c == '<' )
handleMod( c );
else if( c == '"' )
handleQuote( c );
else
handleChar( c );
}
void ExpressionParser::handleSpace( const TQChar& )
{
if( m_state > ExpectMinus )
finishedToken();
}
void ExpressionParser::handleMinus( const TQChar &c )
{
if( m_state == ExpectMinus )
{
m_element.negate = true;
m_state = ExpectField;
}
else
handleChar( c );
}
void ExpressionParser::handleColon( const TQChar &c )
{
if( m_state <= ExpectField && !m_string.isEmpty() )
{
m_element.field = m_string;
m_string = TQString();
m_state = ExpectMod;
}
else
handleChar( c );
}
void ExpressionParser::handleMod( const TQChar &c )
{
if( m_state == ExpectMod )
{
m_element.match = ( c == '>' ) ? expression_element::More : expression_element::Less;
m_state = ExpectText;
}
else
handleChar( c );
}
void ExpressionParser::handleQuote( const TQChar& )
{
if( m_inQuote )
{
finishedElement();
m_inQuote = false;
}
else
{
if( !m_string.isEmpty() )
finishedToken();
m_state = ExpectText;
m_inQuote = true;
}
}
void ExpressionParser::handleChar( const TQChar &c )
{
m_string += c;
if( m_state <= ExpectField )
m_state = ExpectField;
else if( m_state <= ExpectText )
m_state = ExpectText;
}
void ExpressionParser::finishedToken()
{
enum { And, Or, Neither };
int s;
if( m_haveGroup || !m_element.field.isEmpty() )
s = Neither;
else if( m_string == "AND" )
s = And;
else if( m_string == "OR" )
s = Or;
else
s = Neither;
if( s == Neither )
finishedElement();
else
{
m_haveGroup = true;
if( s == Or )
m_inOrGroup = true;
else
finishedOrGroup();
m_string = TQString();
m_state = ExpectMinus;
}
}
void ExpressionParser::finishedElement()
{
if( !m_inOrGroup )
finishedOrGroup();
m_inOrGroup = m_haveGroup = false;
m_element.text = m_string;
m_string = TQString();
if( !m_element.text.isEmpty() || !m_element.field.isEmpty() )
m_or.append( m_element );
m_element = expression_element();
m_state = ExpectMinus;
}
void ExpressionParser::finishedOrGroup()
{
if( !m_or.isEmpty() )
m_parsed.append( m_or );
m_or.clear();
m_inOrGroup = false;
}
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