public ASTNode VisitBinExpr([NotNull] llangParser.ExprContext context)
{
if (context.multop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.multop().GetText(), MakeSourceLoc(context)));
}
else if (context.addop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.addop().GetText(), MakeSourceLoc(context)));
}
else if (context.shiftop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.shiftop().GetText(), MakeSourceLoc(context)));
}
else if (context.compop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.compop().GetText(), MakeSourceLoc(context)));
}
else if (context.eqop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.eqop().GetText(), MakeSourceLoc(context)));
}
else if (context.bitwiseop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.bitwiseop().GetText(), MakeSourceLoc(context)));
}
else if (context.logicop() != null)
{
Expression lhs = (Expression)Visit(context.expr(0));
Expression rhs = (Expression)Visit(context.expr(1));
return(new BinaryExprNode(lhs, rhs, context.logicop().GetText(), MakeSourceLoc(context)));
}
else
{
throw new NotImplementedException();
}
}
/// <summary>
/// Exit a parse tree produced by <see cref="llangParser.expr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitExpr([NotNull] llangParser.ExprContext context)
{
}
public override ASTNode VisitExpr([NotNull] llangParser.ExprContext context)
{
if (context.Iden() != null && context.expr().Length == 0)
{
string name = context.Iden().GetText();
if (name == "null")
{
return(new NullNode(MakeSourceLoc(context)));
}
return(new IdenExprNode(name, TypeSymbol.INFER_SYMOBOL("__var__"), MakeSourceLoc(context)));
}
else if (context.Number() != null)
{
if (context.Number().GetText().Contains("."))
{
return(new FloatExprNode(float.Parse(context.Number().GetText()), MakeSourceLoc(context)));
}
return(new IntExprNode(int.Parse(context.Number().GetText()), MakeSourceLoc(context)));
}
else if (context.String() != null)
{
return(new StringExprNode(context.String().GetText().Trim('\"'), MakeSourceLoc(context)));
}
else if (context.varlist() != null)
{
Expression l = (Expression)Visit(context.varlist().expr(0));
Expression u = (Expression)Visit(context.varlist().expr(1));
Expression s = context.varlist().expr().Length == 2 ? new IntExprNode(1, MakeSourceLoc(context)) : (Expression)Visit(context.varlist().expr(2));
return(new VarListExprNode(l, u, s, MakeSourceLoc(context)));
}
else if (context.elementlist() != null)
{
List <Expression> elems = new List <Expression>();
if (context.elementlist() != null)
{
for (int i = 0; i < context.elementlist().expr().Length; i++)
{
elems.Add((Expression)Visit(context.elementlist().expr(i)));
}
}
return(new ConstListExprNode(elems, MakeSourceLoc(context)));
}
else if (context.unaryop() != null)
{
Expression operand = (Expression)Visit(context.expr(0));
return(new UnaryExprNode(operand, context.unaryop().GetText(), MakeSourceLoc(context)));
}
else if (context.multop() != null || context.addop() != null || context.shiftop() != null || context.compop() != null ||
context.eqop() != null || context.bitwiseop() != null || context.logicop() != null)
{
return(VisitBinExpr(context));
}
else if (context.Iden() != null && context.expr().Length == 1 && context.argslist() == null)
{
Expression basestruct = (Expression)Visit(context.expr(0));
string fieldname = context.Iden().GetText();
return(new FieldAccessNode(basestruct, fieldname, MakeSourceLoc(context)));
}
else if (context.Iden() != null && context.expr().Length == 1 && context.argslist() != null)
{
Expression e = (Expression)Visit(context.expr(0));
List <Expression> args = new List <Expression>()
{
(Expression)Visit(context.expr(0))
};
if (context.argslist() != null)
{
for (int i = 0; i < context.argslist().expr().Length; i++)
{
args.Add((Expression)Visit(context.argslist().expr(i)));
}
}
return(new ImplicitFunCallExprNode(context.Iden().GetText(), e, args, MakeSourceLoc(context)));
}
else if (context.argslist() != null)
{
Expression e = (Expression)Visit(context.expr(0));
List <Expression> args = new List <Expression>();
if (context.argslist() != null)
{
for (int i = 0; i < context.argslist().expr().Length; i++)
{
args.Add((Expression)Visit(context.argslist().expr(i)));
}
}
return(new FunCallExprNode(e, args, MakeSourceLoc(context)));
}
else if (context.expr().Length == 2)
{
Expression array = (Expression)Visit(context.expr(0));
Expression idx = (Expression)Visit(context.expr(1));
return(new ArrayIndexNode(array, idx, MakeSourceLoc(context)));
}
else if (context.expr().Length == 1)
{
Expression e = (Expression)Visit(context.expr(0));
return(e);
}
else if (context.typename() != null)
{
return(new NewStructNode(context.typename().GetText(), MakeSourceLoc(context)));
}
else
{
throw new NotImplementedException();
}
}
/// <summary>
/// Visit a parse tree produced by <see cref="llangParser.expr"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitExpr([NotNull] llangParser.ExprContext context)
{
return(VisitChildren(context));
}
