/**
* parses and evaluates the given expression.
* @returns
* - On error, an error message is returned.
* - On success, the result of the expression is either "1" or "0".
*/
bool CondParser::parse(const QString &fileName, int lineNr, const QString &expr)
{
m_expr = expr;
m_tokenType = NOTHING;
// initialize all variables
m_e = m_expr.constData(); // let m_e point to the start of the expression
bool answer = false;
getToken();
if (m_tokenType == DELIMITER && m_token.isEmpty()) {
// empty expression: answer==false
} else if (m_err.isEmpty()) {
answer = parseLevel1();
}
if (! m_err.isEmpty()) {
warn(fileName, lineNr, "problem evaluating expression '%s': %s", qPrintable(expr), qPrintable(m_err));
}
return answer;
}
/**
* parses and evaluates the given expression.
* @returns
* - On error, an error message is returned.
* - On success, the result of the expression is either "1" or "0".
*/
bool CondParser::parse(const char *fileName,int lineNr,const char *expr)
{
m_expr = expr;
m_tokenType = NOTHING;
// initialize all variables
m_e = m_expr; // let m_e point to the start of the expression
bool answer=FALSE;
getToken();
if (m_tokenType==DELIMITER && m_token.isEmpty())
{
// empty expression: answer==FALSE
}
else if (m_err.isEmpty())
{
answer = parseLevel1();
#if 0
// check for garbage at the end of the expression
// an expression ends with a character '\0' and token_type = delimeter
if (m_tokenType!=DELIMITER || !m_token.isEmpty())
{
if (m_tokenType == DELIMITER)
{
if (m_token=="(" || m_token==")")
{
m_err=QCString("Unexpected parenthesis ")+m_token+"'";
}
else
{
// user entered a not existing operator like "//"
m_err=QCString("Unexpected operator ")+m_token+"'";
}
}
else
{
m_err=QCString("Unexpected part '")+m_token+"'";
}
}
#endif
}
if (m_err)
{
warn(fileName,lineNr,"problem evaluating expression '%s': %s",
expr,m_err.data());
}
//printf("expr='%s' answer=%d\n",expr,answer);
return answer;
}
/**
* parenthesized expression or variable
*/
bool CondParser::parseLevel3() {
// check if it is a parenthesized expression
if (m_tokenType == DELIMITER) {
if (m_token == "(") {
getToken();
int ans = parseLevel1();
if (m_tokenType != DELIMITER || m_token != ")") {
m_err = "Parenthesis ) missing";
return FALSE;
}
getToken();
return ans;
}
}
// if not parenthesized then the expression is a variable
return parseVar();
}