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/*
* Copyright (C) 2007 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/tafreader.h"
#include "bu/exceptions.h"
#include "bu/fstring.h"
using namespace Bu;
Bu::TafReader::TafReader( Bu::Stream &sIn ) :
c( 0 ),
sIn( sIn )
{
next(); next();
}
Bu::TafReader::~TafReader()
{
}
Bu::TafGroup *Bu::TafReader::readGroup()
{
ws();
if( c != '{' )
throw TafException("Expected '{'");
next();
ws();
FString sName = readStr();
TafGroup *pGroup = new TafGroup( sName );
next();
//printf("Node[%s]:\n", sName.getStr() );
groupContent( pGroup );
if( c != '}' )
throw TafException("Expected '}'");
next();
return pGroup;
}
void Bu::TafReader::groupContent( Bu::TafGroup *pGroup )
{
for(;;)
{
ws();
if( c == '{' )
pGroup->addChild( readGroup() );
else if( c == '}' )
return;
else if( c == '/' && la == '*' )
pGroup->addChild( readComment() );
else if( c == '/' && la == '/' )
pGroup->addChild( readComment( true ) );
else if( c == ':' )
throw TafException("Encountered stray ':' in taf stream.");
else
pGroup->addChild( readProperty() );
}
}
Bu::TafProperty *Bu::TafReader::readProperty()
{
FString sName = readStr();
ws();
if( c != '=' )
{
//printf(" %s (true)\n", sName.getStr() );
return new Bu::TafProperty( "", sName );
}
next();
FString sValue = readStr();
return new Bu::TafProperty( sName, sValue );
//printf(" %s = %s\n", sName.getStr(), sValue.getStr() );
}
Bu::TafComment *Bu::TafReader::readComment( bool bEOL )
{
FString sCmnt;
next();
if( bEOL )
{
for(;;)
{
next();
if( c == '\n' && la == '\r' )
{
next(); next();
break;
}
else if( c == '\n' || c == '\r' )
{
next();
break;
}
sCmnt += c;
}
}
else
{
for(;;)
{
next();
if( c == '*' && la == '/' )
{
next(); next();
break;
}
sCmnt += c;
}
}
return new TafComment( sCmnt, bEOL );
}
Bu::FString Bu::TafReader::readStr()
{
ws();
FString s;
if( c == '"' )
{
next();
for(;;)
{
if( c == '\\' )
{
next();
if( c == 'x' )
{
char code[3]={'\0','\0','\0'};
next();
code[0] = c;
next();
code[1] = c;
c = (unsigned char)strtol( code, NULL, 16 );
}
else if( c == '"' )
c = '"';
else
throw TafException("Invalid escape sequence.");
}
else if( c == '"' )
break;
s += c;
next();
}
next();
}
else
{
for(;;)
{
if( isws() || c == '}' || c == '{' || c == ':' || c == '=' )
break;
s += c;
next();
}
}
return s;
}
void Bu::TafReader::ws()
{
for(;;)
{
if( !isws() )
return;
next();
}
}
bool Bu::TafReader::isws()
{
return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
}
void Bu::TafReader::next()
{
c = la;
sIn.read( &la, 1 );
}
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