int eeeprintDotTree(antlr::RefAST tree, std::ostream& out, antlr::Parser& p) {
int me = ++_dot_node;
out << me << " [label=\"" << p.getTokenName(tree->getType())
<< "\\n" << tree->getText() << "\"];" << std::endl;
antlr::RefAST c = tree->getFirstChild();
while (antlr::nullAST != c) {
int child = printDotTree(c, out, p);
out << me << " -> " << child << ";" << std::endl;
c = c->getNextSibling();
}
return me;
}
double getValue( antlr::RefAST &refAST ) {
switch( refAST->getType() ) {
case MExprParserTokenTypes::ADD :
case MExprParserTokenTypes::SUB :
{
std::string op = refAST->getText();
antlr::RefAST child1 = refAST->getFirstChild();
double value1 = getValue( child1 );
if ( ISNAN( value1 ) ) return std::numeric_limits< double >::quiet_NaN();
antlr::RefAST child2 = child1->getNextSibling();
if ( child2 == antlr::nullAST ) {
return op == "+" ? value1 : -value1;
}
double value2 = getValue( child2 );
if ( ISNAN( value2 ) ) return std::numeric_limits< double >::quiet_NaN();
return op == "+" ? value1 + value2 : value1 - value2;
}
case MExprParserTokenTypes::MUL :
case MExprParserTokenTypes::DIV :
case MExprParserTokenTypes::MOD :
{
std::string op = refAST->getText();
antlr::RefAST child1 = refAST->getFirstChild();
double value1 = getValue( child1 );
if ( ISNAN( value1 ) ) return std::numeric_limits< double >::quiet_NaN();
antlr::RefAST child2 = child1->getNextSibling();
double value2 = getValue( child2 );
if ( ISNAN( value2 ) ) return std::numeric_limits< double >::quiet_NaN();
if ( op == "*" ) return value1 * value2;
if ( op == "/" ) return value1 / value2;
// MOD (%)
if ( value2 == 0 ) return std::numeric_limits< double >::quiet_NaN();
return static_cast< int >( value1 ) % static_cast< int >( value2 );
}
case MExprParserTokenTypes::VAR :
{
std::string op = refAST->getText();
if ( op == "pi" ) return M_PI;
if ( op == "e" ) return M_E;
return std::numeric_limits< double >::quiet_NaN();
}
case MExprParserTokenTypes::NUM :
{
std::string num = refAST->getText();
return atof( num.c_str() );
}
}
return std::numeric_limits< double >::quiet_NaN();
}
