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#include "scriptengine.h"
#include "lexer.h"
#include "parser.h"
#include "expression.h"
#include <bu/staticmembuf.h>
#include <bu/exceptionbase.h>
#include <bu/sio.h>
#include <stdlib.h>
ScriptEngine::ScriptEngine() :
bRunning( true )
{
}
ScriptEngine::~ScriptEngine()
{
}
void ScriptEngine::exec( const Bu::String &sExpr )
{
Bu::StaticMemBuf mb( sExpr.getStr(), sExpr.getSize() );
exec( sExpr );
}
void ScriptEngine::exec( Bu::Stream &sInput )
{
Lexer l( sInput );
Parser p( l );
Expression *pExp = p.parse();
exec( pExp );
delete pExp;
}
void ScriptEngine::exec( Expression *pExpr )
{
NumStack sNums;
for( Expression::iterator i = pExpr->begin(); i; i++ )
{
// Bu::sio << (*i).eType << " - " << sNums << Bu::sio.nl;
if( ((*i).eType&Token::mMetaCmd) )
{
command( i );
continue;
}
switch( (*i).eType )
{
case Token::tNumber:
sNums.push( *(*i).nVal );
break;
case Token::tVariable:
if( hVarState.has( *(*i).sVal ) )
{
sNums.push( hVarState[*(*i).sVal] );
}
else
{
if( sigError.isSet() )
sigError(
Bu::String("No such variable: $%1").
arg(*(*i).sVal)
);
return;
}
break;
case Token::tPlus:
{
Number b = sNums.peekPop();
Number a = sNums.peekPop();
sNums.push( a + b );
}
break;
case Token::tMinus:
{
Number b = sNums.peekPop();
Number a = sNums.peekPop();
sNums.push( a - b );
}
break;
case Token::tDivide:
{
Number b = sNums.peekPop();
Number a = sNums.peekPop();
sNums.push( a / b );
}
break;
case Token::tMultiply:
{
Number b = sNums.peekPop();
Number a = sNums.peekPop();
sNums.push( a * b );
}
break;
case Token::tNegate:
sNums.push( -sNums.peekPop() );
break;
}
}
if( sigNumResult.isSet() )
sigNumResult( sNums.peekPop() );
}
void ScriptEngine::command( Expression::iterator &i )
{
switch( (*i).eType )
{
case Token::tCmdExit:
bRunning = false;
return;
case Token::tCmdScale:
{
if( !(++i) )
{
if( sigError.isSet() )
sigError("You must provide a positive integer.");
return;
}
int32_t iScale = strtol( (*i).sVal->getStr(), 0, 10 );
if( iScale < 0 )
{
if( sigError.isSet() )
sigError("You must provide a positive integer.");
return;
}
if( sigMessage.isSet() )
sigMessage(Bu::String("Changed scale to: %1").arg( iScale ));
for( VarHash::iterator i = hVarState.begin(); i; i++ )
(*i).setScale( iScale );
}
break;
case Token::tCmdRadix:
break;
case Token::tCmdExtended:
/*
else if( sCmd == "vars" )
{
}
else if( sCmd == "help" || sCmd == "?" )
{
}
else
{
}*/
break;
}
}
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