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/**CFile****************************************************************
FileName [mioParse.c]
PackageName [MVSIS 1.3: Multi-valued logic synthesis system.]
Synopsis [Parsing Boolean expressions.]
Author [MVSIS Group]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - September 8, 2003.]
Revision [$Id: mioParse.c,v 1.4 2004/06/28 14:20:25 alanmi Exp $]
***********************************************************************/
#include "mioInt.h"
#include "exp.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// the list of operation symbols to be used in expressions
#define MIO_EQN_SYM_OPEN '(' // opening paranthesis
#define MIO_EQN_SYM_CLOSE ')' // closing paranthesis
#define MIO_EQN_SYM_CONST0 '0' // constant 0
#define MIO_EQN_SYM_CONST1 '1' // constant 1
#define MIO_EQN_SYM_NEG '!' // negation before the variable
#define MIO_EQN_SYM_NEGAFT '\'' // negation after the variable
#define MIO_EQN_SYM_AND '*' // logic AND
#define MIO_EQN_SYM_AND2 '&' // logic AND
#define MIO_EQN_SYM_XOR '^' // logic XOR
#define MIO_EQN_SYM_OR '+' // logic OR
#define MIO_EQN_SYM_OR2 '|' // logic OR
// the list of opcodes (also specifying operation precedence)
#define MIO_EQN_OPER_NEG 10 // negation
#define MIO_EQN_OPER_AND 9 // logic AND
#define MIO_EQN_OPER_XOR 8 // logic XOR
#define MIO_EQN_OPER_OR 7 // logic OR
#define MIO_EQN_OPER_MARK 1 // OpStack token standing for an opening paranthesis
// these are values of the internal Flag
#define MIO_EQN_FLAG_START 1 // after the opening parenthesis
#define MIO_EQN_FLAG_VAR 2 // after operation is received
#define MIO_EQN_FLAG_OPER 3 // after operation symbol is received
#define MIO_EQN_FLAG_ERROR 4 // when error is detected
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Performs the operation on the top entries in the stack.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Mio_ParseFormulaOper( int * pMan, int nVars, Vec_Ptr_t * pStackFn, int Oper )
{
Vec_Int_t * gArg1, * gArg2, * gFunc;
// perform the given operation
gArg2 = (Vec_Int_t *)Vec_PtrPop( pStackFn );
gArg1 = (Vec_Int_t *)Vec_PtrPop( pStackFn );
if ( Oper == MIO_EQN_OPER_AND )
gFunc = Exp_And( pMan, nVars, gArg1, gArg2, 0, 0 );
else if ( Oper == MIO_EQN_OPER_OR )
gFunc = Exp_Or( pMan, nVars, gArg1, gArg2 );
else if ( Oper == MIO_EQN_OPER_XOR )
gFunc = Exp_Xor( pMan, nVars, gArg1, gArg2 );
else
return NULL;
// Cudd_Ref( gFunc );
// Cudd_RecursiveDeref( dd, gArg1 );
// Cudd_RecursiveDeref( dd, gArg2 );
Vec_IntFree( gArg1 );
Vec_IntFree( gArg2 );
Vec_PtrPush( pStackFn, gFunc );
return gFunc;
}
/**Function*************************************************************
Synopsis [Derives the AIG corresponding to the equation.]
Description [Takes the stream to output messages, the formula, the vector
of variable names and the AIG manager.]
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Mio_ParseFormula( char * pFormInit, char ** ppVarNames, int nVars )
{
char * pFormula;
int Man = nVars, * pMan = &Man;
Vec_Ptr_t * pStackFn;
Vec_Int_t * pStackOp;
Vec_Int_t * gFunc;
char * pTemp, * pName;
int nParans, fFound, Flag;
int Oper, Oper1, Oper2;
int i, v;
// make sure that the number of opening and closing parantheses is the same
nParans = 0;
for ( pTemp = pFormInit; *pTemp; pTemp++ )
if ( *pTemp == '(' )
nParans++;
else if ( *pTemp == ')' )
nParans--;
if ( nParans != 0 )
{
fprintf( stdout, "Mio_ParseFormula(): Different number of opening and closing parantheses ().\n" );
return NULL;
}
// copy the formula
pFormula = ABC_ALLOC( char, strlen(pFormInit) + 3 );
sprintf( pFormula, "(%s)", pFormInit );
// start the stacks
pStackFn = Vec_PtrAlloc( 100 );
pStackOp = Vec_IntAlloc( 100 );
Flag = MIO_EQN_FLAG_START;
for ( pTemp = pFormula; *pTemp; pTemp++ )
{
switch ( *pTemp )
{
// skip all spaces, tabs, and end-of-lines
case ' ':
case '\t':
case '\r':
case '\n':
continue;
case MIO_EQN_SYM_CONST0:
Vec_PtrPush( pStackFn, Exp_Const0() ); // Cudd_Ref( b0 );
if ( Flag == MIO_EQN_FLAG_VAR )
{
fprintf( stdout, "Mio_ParseFormula(): No operation symbol before constant 0.\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
Flag = MIO_EQN_FLAG_VAR;
break;
case MIO_EQN_SYM_CONST1:
Vec_PtrPush( pStackFn, Exp_Const1() ); // Cudd_Ref( b1 );
if ( Flag == MIO_EQN_FLAG_VAR )
{
fprintf( stdout, "Mio_ParseFormula(): No operation symbol before constant 1.\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
Flag = MIO_EQN_FLAG_VAR;
break;
case MIO_EQN_SYM_NEG:
if ( Flag == MIO_EQN_FLAG_VAR )
{// if NEGBEF follows a variable, AND is assumed
Vec_IntPush( pStackOp, MIO_EQN_OPER_AND );
Flag = MIO_EQN_FLAG_OPER;
}
Vec_IntPush( pStackOp, MIO_EQN_OPER_NEG );
break;
case MIO_EQN_SYM_NEGAFT:
if ( Flag != MIO_EQN_FLAG_VAR )
{// if there is no variable before NEGAFT, it is an error
fprintf( stdout, "Mio_ParseFormula(): No variable is specified before the negation suffix.\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
else // if ( Flag == PARSE_FLAG_VAR )
Vec_PtrPush( pStackFn, Exp_Not( (Vec_Int_t *)Vec_PtrPop(pStackFn) ) );
break;
case MIO_EQN_SYM_AND:
case MIO_EQN_SYM_AND2:
case MIO_EQN_SYM_OR:
case MIO_EQN_SYM_OR2:
case MIO_EQN_SYM_XOR:
if ( Flag != MIO_EQN_FLAG_VAR )
{
fprintf( stdout, "Mio_ParseFormula(): There is no variable before AND, EXOR, or OR.\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
if ( *pTemp == MIO_EQN_SYM_AND || *pTemp == MIO_EQN_SYM_AND2 )
Vec_IntPush( pStackOp, MIO_EQN_OPER_AND );
else if ( *pTemp == MIO_EQN_SYM_OR || *pTemp == MIO_EQN_SYM_OR2 )
Vec_IntPush( pStackOp, MIO_EQN_OPER_OR );
else //if ( *pTemp == MIO_EQN_SYM_XOR )
Vec_IntPush( pStackOp, MIO_EQN_OPER_XOR );
Flag = MIO_EQN_FLAG_OPER;
break;
case MIO_EQN_SYM_OPEN:
if ( Flag == MIO_EQN_FLAG_VAR )
{
Vec_IntPush( pStackOp, MIO_EQN_OPER_AND );
// fprintf( stdout, "Mio_ParseFormula(): An opening paranthesis follows a var without operation sign.\n" );
// Flag = MIO_EQN_FLAG_ERROR;
// break;
}
Vec_IntPush( pStackOp, MIO_EQN_OPER_MARK );
// after an opening bracket, it feels like starting over again
Flag = MIO_EQN_FLAG_START;
break;
case MIO_EQN_SYM_CLOSE:
if ( Vec_IntSize( pStackOp ) != 0 )
{
while ( 1 )
{
if ( Vec_IntSize( pStackOp ) == 0 )
{
fprintf( stdout, "Mio_ParseFormula(): There is no opening paranthesis\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
Oper = Vec_IntPop( pStackOp );
if ( Oper == MIO_EQN_OPER_MARK )
break;
// perform the given operation
if ( Mio_ParseFormulaOper( pMan, nVars, pStackFn, Oper ) == NULL )
{
fprintf( stdout, "Mio_ParseFormula(): Unknown operation\n" );
ABC_FREE( pFormula );
Vec_PtrFreeP( &pStackFn );
Vec_IntFreeP( &pStackOp );
return NULL;
}
}
}
else
{
fprintf( stdout, "Mio_ParseFormula(): There is no opening paranthesis\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
if ( Flag != MIO_EQN_FLAG_ERROR )
Flag = MIO_EQN_FLAG_VAR;
break;
default:
// scan the next name
for ( i = 0; pTemp[i] &&
pTemp[i] != ' ' && pTemp[i] != '\t' && pTemp[i] != '\r' && pTemp[i] != '\n' &&
pTemp[i] != MIO_EQN_SYM_AND && pTemp[i] != MIO_EQN_SYM_AND2 && pTemp[i] != MIO_EQN_SYM_OR && pTemp[i] != MIO_EQN_SYM_OR2 &&
pTemp[i] != MIO_EQN_SYM_XOR && pTemp[i] != MIO_EQN_SYM_NEGAFT && pTemp[i] != MIO_EQN_SYM_CLOSE;
i++ )
{
if ( pTemp[i] == MIO_EQN_SYM_NEG || pTemp[i] == MIO_EQN_SYM_OPEN )
{
fprintf( stdout, "Mio_ParseFormula(): The negation sign or an opening paranthesis inside the variable name.\n" );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
}
// variable name is found
fFound = 0;
// Vec_PtrForEachEntry( char *, vVarNames, pName, v )
for ( v = 0; v < nVars; v++ )
{
pName = ppVarNames[v];
if ( strncmp(pTemp, pName, i) == 0 && strlen(pName) == (unsigned)i )
{
pTemp += i-1;
fFound = 1;
break;
}
}
if ( !fFound )
{
fprintf( stdout, "Mio_ParseFormula(): The parser cannot find var \"%s\" in the input var list.\n", pTemp );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
/*
if ( Flag == MIO_EQN_FLAG_VAR )
{
fprintf( stdout, "Mio_ParseFormula(): The variable name \"%s\" follows another var without operation sign.\n", pTemp );
Flag = MIO_EQN_FLAG_ERROR;
break;
}
*/
if ( Flag == MIO_EQN_FLAG_VAR )
Vec_IntPush( pStackOp, MIO_EQN_OPER_AND );
Vec_PtrPush( pStackFn, Exp_Var(v) ); // Cudd_Ref( pbVars[v] );
Flag = MIO_EQN_FLAG_VAR;
break;
}
if ( Flag == MIO_EQN_FLAG_ERROR )
break; // error exit
else if ( Flag == MIO_EQN_FLAG_START )
continue; // go on parsing
else if ( Flag == MIO_EQN_FLAG_VAR )
while ( 1 )
{ // check if there are negations in the OpStack
if ( Vec_IntSize( pStackOp ) == 0 )
break;
Oper = Vec_IntPop( pStackOp );
if ( Oper != MIO_EQN_OPER_NEG )
{
Vec_IntPush( pStackOp, Oper );
break;
}
else
{
Vec_PtrPush( pStackFn, Exp_Not((Vec_Int_t *)Vec_PtrPop(pStackFn)) );
}
}
else // if ( Flag == MIO_EQN_FLAG_OPER )
while ( 1 )
{ // execute all the operations in the OpStack
// with precedence higher or equal than the last one
Oper1 = Vec_IntPop( pStackOp ); // the last operation
if ( Vec_IntSize( pStackOp ) == 0 )
{ // if it is the only operation, push it back
Vec_IntPush( pStackOp, Oper1 );
break;
}
Oper2 = Vec_IntPop( pStackOp ); // the operation before the last one
if ( Oper2 >= Oper1 )
{ // if Oper2 precedence is higher or equal, execute it
if ( Mio_ParseFormulaOper( pMan, nVars, pStackFn, Oper2 ) == NULL )
{
fprintf( stdout, "Mio_ParseFormula(): Unknown operation\n" );
ABC_FREE( pFormula );
Vec_PtrFreeP( &pStackFn );
Vec_IntFreeP( &pStackOp );
return NULL;
}
Vec_IntPush( pStackOp, Oper1 ); // push the last operation back
}
else
{ // if Oper2 precedence is lower, push them back and done
Vec_IntPush( pStackOp, Oper2 );
Vec_IntPush( pStackOp, Oper1 );
break;
}
}
}
if ( Flag != MIO_EQN_FLAG_ERROR )
{
if ( Vec_PtrSize(pStackFn) != 0 )
{
gFunc = (Vec_Int_t *)Vec_PtrPop(pStackFn);
if ( Vec_PtrSize(pStackFn) == 0 )
if ( Vec_IntSize( pStackOp ) == 0 )
{
// Cudd_Deref( gFunc );
ABC_FREE( pFormula );
Vec_PtrFreeP( &pStackFn );
Vec_IntFreeP( &pStackOp );
return Exp_Reverse(gFunc);
}
else
fprintf( stdout, "Mio_ParseFormula(): Something is left in the operation stack\n" );
else
fprintf( stdout, "Mio_ParseFormula(): Something is left in the function stack\n" );
}
else
fprintf( stdout, "Mio_ParseFormula(): The input string is empty\n" );
}
ABC_FREE( pFormula );
Vec_PtrFreeP( &pStackFn );
Vec_IntFreeP( &pStackOp );
return NULL;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
