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/**CFile****************************************************************
FileNameIn [parseEqn.c]
PackageName [ABC: Logic synthesis and verification system.]
Synopsis [Boolean formula parser.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - December 18, 2006.]
Revision [$Id: parseEqn.c,v 1.0 2006/12/18 00:00:00 alanmi Exp $]
***********************************************************************/
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
#include "parseInt.h"
ABC_NAMESPACE_IMPL_START
// the list of operation symbols to be used in expressions
#define PARSE_EQN_SYM_OPEN '(' // opening parenthesis
#define PARSE_EQN_SYM_CLOSE ')' // closing parenthesis
#define PARSE_EQN_SYM_CONST0 '0' // constant 0
#define PARSE_EQN_SYM_CONST1 '1' // constant 1
#define PARSE_EQN_SYM_NEG '!' // negation before the variable
#define PARSE_EQN_SYM_AND '*' // logic AND
#define PARSE_EQN_SYM_XOR '^' // logic XOR
#define PARSE_EQN_SYM_OR '+' // logic OR
// the list of opcodes (also specifying operation precedence)
#define PARSE_EQN_OPER_NEG 10 // negation
#define PARSE_EQN_OPER_AND 9 // logic AND
#define PARSE_EQN_OPER_XOR 8 // logic XOR
#define PARSE_EQN_OPER_OR 7 // logic OR
#define PARSE_EQN_OPER_MARK 1 // OpStack token standing for an opening parenthesis
// these are values of the internal Flag
#define PARSE_EQN_FLAG_START 1 // after the opening parenthesis
#define PARSE_EQN_FLAG_VAR 2 // after operation is received
#define PARSE_EQN_FLAG_OPER 3 // after operation symbol is received
#define PARSE_EQN_FLAG_ERROR 4 // when error is detected
#define PARSE_EQN_STACKSIZE 1000
static Hop_Obj_t * Parse_ParserPerformTopOp( Hop_Man_t * pMan, Parse_StackFn_t * pStackFn, int Oper );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**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 []
***********************************************************************/
Hop_Obj_t * Parse_FormulaParserEqn( FILE * pOutput, char * pFormInit, Vec_Ptr_t * vVarNames, Hop_Man_t * pMan )
{
char * pFormula;
Parse_StackFn_t * pStackFn;
Parse_StackOp_t * pStackOp;
Hop_Obj_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 parentheses is the same
nParans = 0;
for ( pTemp = pFormInit; *pTemp; pTemp++ )
if ( *pTemp == '(' )
nParans++;
else if ( *pTemp == ')' )
nParans--;
if ( nParans != 0 )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): Different number of opening and closing parentheses ().\n" );
return NULL;
}
// copy the formula
pFormula = ABC_ALLOC( char, strlen(pFormInit) + 3 );
sprintf( pFormula, "(%s)", pFormInit );
// start the stacks
pStackFn = Parse_StackFnStart( PARSE_EQN_STACKSIZE );
pStackOp = Parse_StackOpStart( PARSE_EQN_STACKSIZE );
Flag = PARSE_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 PARSE_EQN_SYM_CONST0:
Parse_StackFnPush( pStackFn, Hop_ManConst0(pMan) ); // Cudd_Ref( b0 );
if ( Flag == PARSE_EQN_FLAG_VAR )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): No operation symbol before constant 0.\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
Flag = PARSE_EQN_FLAG_VAR;
break;
case PARSE_EQN_SYM_CONST1:
Parse_StackFnPush( pStackFn, Hop_ManConst1(pMan) ); // Cudd_Ref( b1 );
if ( Flag == PARSE_EQN_FLAG_VAR )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): No operation symbol before constant 1.\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
Flag = PARSE_EQN_FLAG_VAR;
break;
case PARSE_EQN_SYM_NEG:
if ( Flag == PARSE_EQN_FLAG_VAR )
{// if NEGBEF follows a variable, AND is assumed
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_AND );
Flag = PARSE_EQN_FLAG_OPER;
}
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_NEG );
break;
case PARSE_EQN_SYM_AND:
case PARSE_EQN_SYM_XOR:
case PARSE_EQN_SYM_OR:
if ( Flag != PARSE_EQN_FLAG_VAR )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): There is no variable before AND, EXOR, or OR.\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
if ( *pTemp == PARSE_EQN_SYM_AND )
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_AND );
else if ( *pTemp == PARSE_EQN_SYM_OR )
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_OR );
else //if ( *pTemp == PARSE_EQN_SYM_XOR )
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_XOR );
Flag = PARSE_EQN_FLAG_OPER;
break;
case PARSE_EQN_SYM_OPEN:
if ( Flag == PARSE_EQN_FLAG_VAR )
{
// Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_AND );
fprintf( pOutput, "Parse_FormulaParserEqn(): An opening parenthesis follows a var without operation sign.\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
Parse_StackOpPush( pStackOp, PARSE_EQN_OPER_MARK );
// after an opening bracket, it feels like starting over again
Flag = PARSE_EQN_FLAG_START;
break;
case PARSE_EQN_SYM_CLOSE:
if ( !Parse_StackOpIsEmpty( pStackOp ) )
{
while ( 1 )
{
if ( Parse_StackOpIsEmpty( pStackOp ) )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): There is no opening parenthesis\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
Oper = Parse_StackOpPop( pStackOp );
if ( Oper == PARSE_EQN_OPER_MARK )
break;
// perform the given operation
if ( Parse_ParserPerformTopOp( pMan, pStackFn, Oper ) == NULL )
{
Parse_StackFnFree( pStackFn );
Parse_StackOpFree( pStackOp );
fprintf( pOutput, "Parse_FormulaParserEqn(): Unknown operation\n" );
ABC_FREE( pFormula );
return NULL;
}
}
}
else
{
fprintf( pOutput, "Parse_FormulaParserEqn(): There is no opening parenthesis\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
if ( Flag != PARSE_EQN_FLAG_ERROR )
Flag = PARSE_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] != PARSE_EQN_SYM_AND && pTemp[i] != PARSE_EQN_SYM_OR && pTemp[i] != PARSE_EQN_SYM_XOR && pTemp[i] != PARSE_EQN_SYM_CLOSE; i++ )
{
if ( pTemp[i] == PARSE_EQN_SYM_NEG || pTemp[i] == PARSE_EQN_SYM_OPEN )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): The negation sign or an opening parenthesis inside the variable name.\n" );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
}
// variable name is found
fFound = 0;
Vec_PtrForEachEntry( char *, vVarNames, pName, v )
if ( strncmp(pTemp, pName, i) == 0 && strlen(pName) == (unsigned)i )
{
pTemp += i-1;
fFound = 1;
break;
}
if ( !fFound )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): The parser cannot find var \"%s\" in the input var list.\n", pTemp );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
if ( Flag == PARSE_EQN_FLAG_VAR )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): The variable name \"%s\" follows another var without operation sign.\n", pTemp );
Flag = PARSE_EQN_FLAG_ERROR;
break;
}
Parse_StackFnPush( pStackFn, Hop_IthVar( pMan, v ) ); // Cudd_Ref( pbVars[v] );
Flag = PARSE_EQN_FLAG_VAR;
break;
}
if ( Flag == PARSE_EQN_FLAG_ERROR )
break; // error exit
else if ( Flag == PARSE_EQN_FLAG_START )
continue; // go on parsing
else if ( Flag == PARSE_EQN_FLAG_VAR )
while ( 1 )
{ // check if there are negations in the OpStack
if ( Parse_StackOpIsEmpty(pStackOp) )
break;
Oper = Parse_StackOpPop( pStackOp );
if ( Oper != PARSE_EQN_OPER_NEG )
{
Parse_StackOpPush( pStackOp, Oper );
break;
}
else
{
Parse_StackFnPush( pStackFn, Hop_Not((Hop_Obj_t *)Parse_StackFnPop(pStackFn)) );
}
}
else // if ( Flag == PARSE_EQN_FLAG_OPER )
while ( 1 )
{ // execute all the operations in the OpStack
// with precedence higher or equal than the last one
Oper1 = Parse_StackOpPop( pStackOp ); // the last operation
if ( Parse_StackOpIsEmpty(pStackOp) )
{ // if it is the only operation, push it back
Parse_StackOpPush( pStackOp, Oper1 );
break;
}
Oper2 = Parse_StackOpPop( pStackOp ); // the operation before the last one
if ( Oper2 >= Oper1 )
{ // if Oper2 precedence is higher or equal, execute it
if ( Parse_ParserPerformTopOp( pMan, pStackFn, Oper2 ) == NULL )
{
fprintf( pOutput, "Parse_FormulaParserEqn(): Unknown operation\n" );
ABC_FREE( pFormula );
Parse_StackFnFree( pStackFn );
Parse_StackOpFree( pStackOp );
return NULL;
}
Parse_StackOpPush( pStackOp, Oper1 ); // push the last operation back
}
else
{ // if Oper2 precedence is lower, push them back and done
Parse_StackOpPush( pStackOp, Oper2 );
Parse_StackOpPush( pStackOp, Oper1 );
break;
}
}
}
if ( Flag != PARSE_EQN_FLAG_ERROR )
{
if ( !Parse_StackFnIsEmpty(pStackFn) )
{
gFunc = (Hop_Obj_t *)Parse_StackFnPop(pStackFn);
if ( Parse_StackFnIsEmpty(pStackFn) )
if ( Parse_StackOpIsEmpty(pStackOp) )
{
Parse_StackFnFree(pStackFn);
Parse_StackOpFree(pStackOp);
// Cudd_Deref( gFunc );
ABC_FREE( pFormula );
return gFunc;
}
else
fprintf( pOutput, "Parse_FormulaParserEqn(): Something is left in the operation stack\n" );
else
fprintf( pOutput, "Parse_FormulaParserEqn(): Something is left in the function stack\n" );
}
else
fprintf( pOutput, "Parse_FormulaParserEqn(): The input string is empty\n" );
}
ABC_FREE( pFormula );
return NULL;
}
/**Function*************************************************************
Synopsis [Performs the operation on the top entries in the stack.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Hop_Obj_t * Parse_ParserPerformTopOp( Hop_Man_t * pMan, Parse_StackFn_t * pStackFn, int Oper )
{
Hop_Obj_t * gArg1, * gArg2, * gFunc;
// perform the given operation
gArg2 = (Hop_Obj_t *)Parse_StackFnPop( pStackFn );
gArg1 = (Hop_Obj_t *)Parse_StackFnPop( pStackFn );
if ( Oper == PARSE_EQN_OPER_AND )
gFunc = Hop_And( pMan, gArg1, gArg2 );
else if ( Oper == PARSE_EQN_OPER_OR )
gFunc = Hop_Or( pMan, gArg1, gArg2 );
else if ( Oper == PARSE_EQN_OPER_XOR )
gFunc = Hop_Exor( pMan, gArg1, gArg2 );
else
return NULL;
// Cudd_Ref( gFunc );
// Cudd_RecursiveDeref( dd, gArg1 );
// Cudd_RecursiveDeref( dd, gArg2 );
Parse_StackFnPush( pStackFn, gFunc );
return gFunc;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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