private AST NodeFactor(bool isFirstNode)
{
AST nodeAST = NodeEntity(isFirstNode);
while (currentToken.Type == TokenType.MUL || currentToken.Type == TokenType.DIV || currentToken.Type == TokenType.BCMUL || currentToken.Type == TokenType.BCDIV)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
nodeAST = new BinOpAST(nodeAST, binOpToken, NodeEntity(isFirstNode));
}
return(nodeAST);
}
private AST NodeEntity(bool isFirstNode)
{
AST nodeAST = Node(isFirstNode);
while (currentToken.Type == TokenType.CARET || currentToken.Type == TokenType.BCPOW)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
nodeAST = new BinOpAST(nodeAST, binOpToken, Node(isFirstNode));
}
return(nodeAST);
}
private AST NodeExpr(bool isFirstNode)
{
AST nodeFactorAST = NodeFactor(isFirstNode);
while (currentToken.Type == TokenType.PLUS || currentToken.Type == TokenType.MINUS)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
nodeFactorAST = new BinOpAST(nodeFactorAST, binOpToken, NodeFactor(isFirstNode));
}
return(nodeFactorAST);
}
private AST ValueEntity()
{
AST valueAST = Value();
while (currentToken.Type == TokenType.CARET || currentToken.Type == TokenType.BCPOW)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
valueAST = new ValBinOpAST(valueAST, binOpToken, Value());
}
return(valueAST);
}
private AST ValueFactor()
{
AST valueAST = ValueEntity();
while (currentToken.Type == TokenType.MUL || currentToken.Type == TokenType.DIV || currentToken.Type == TokenType.BCMUL || currentToken.Type == TokenType.BCDIV)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
valueAST = new ValBinOpAST(valueAST, binOpToken, ValueEntity());
}
return(valueAST);
}
private AST ValueExpr()
{
AST valueFactorAST = ValueFactor();
while (currentToken.Type == TokenType.PLUS || currentToken.Type == TokenType.MINUS)
{
OperatorToken binOpToken = Eat(currentToken.Type) as OperatorToken;
valueFactorAST = new ValBinOpAST(valueFactorAST, binOpToken, ValueFactor());
}
return(valueFactorAST);
}
private ChainAST Chain()
{
AST nodeExprAST = NodeExpr(true);
while (currentToken.Type == TokenType.GOTO)
{
OperatorToken gotoToken = (OperatorToken)currentToken;
Eat(TokenType.GOTO);
nodeExprAST = new GotoOpAST(nodeExprAST, NodeExpr(false), gotoToken);
}
return(new ChainAST(nodeExprAST));
}