int evaluate(char *expression , Stack *dataStack , Stack *operatorStack ) {
Tokenizer *tokenizer;
Token *token;
NumberToken *number;
OperatorToken *operator;
tokenizer = tokenizerNew(expression);
while(1) {
number=(NumberToken*)nextToken(tokenizer);
if(number == NULL) {
Throw(ERR_NOT_DATA);
}
else if(number->type!=NUMBER_TOKEN) {
Throw(ERR_NOT_DATA);
} else
push(dataStack,number);
operator=(OperatorToken *)nextToken(tokenizer);
if(operator == NULL) {
break;
} else if(operator->type!=OPERATOR_TOKEN) {
Throw(ERR_NOT_OPERATOR);
} else
tryEvaluateOperatorsOnStackThenPush(dataStack, operatorStack ,operator);
}
evaluateAlloperatorOnStack(operatorStack ,dataStack);
}
struct token *readAllTokens(char *fileName, struct lm *lm)
/* Get list of all tokens from file. */
{
struct tokenizer *tkz;
struct token *tokList = NULL, *tok;
char *s;
tkz = tokenizerNew(fileName);
tkz->uncommentC = tkz->uncommentShell = tkz->leaveQuotes = TRUE;
while ((s = tokenizerNext(tkz)) != NULL)
{
lmAllocVar(lm, tok);
tok->string = lmCloneString(lm, s);
tok->fileName = fileName;
tok->lineIx = tkz->lf->lineIx;
slAddHead(&tokList, tok);
}
slReverse(&tokList);
return tokList;
}
int evaluate(char *expression,Stack *dataStack,Stack *operatorStack){
Tokenizer *tokenizer;
Token *token;
Token *ansToken;
ErrorCode e;
int i;
int counter =0;
NumberToken *result;
dataStack=stackNew();
operatorStack=stackNew();
tokenizer = tokenizerNew(expression);
if(expression ==NULL){
Throw(ERR_NO_EXPRESSION);
}
while((token=nextToken(tokenizer))!=NULL){
if(counter%2==0&&token->type==OPERATOR_TOKEN){
Throw(ERR_NOT_DATA);
}
else if(counter%2==1&&token->type==NUMBER_TOKEN){
Throw(ERR_NOT_OPERATOR);
}
if(isNumber(token)){
push(token,dataStack);
}
else if(isOperator(token))
{
tryEvaluateOperatorOnStackThenPush((OperatorToken*)token,dataStack,operatorStack);
}
counter ++;
}
evaluateAllOperatorOnStack(dataStack,operatorStack);
result=(NumberToken*)pop(dataStack);
printf("counter needed for each expression : %d \n",counter);
return result->value;
}