/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.value"/>.
/// <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 VisitValue([NotNull] algoParser.ValueContext context)
{
return(VisitChildren(context));
}
//When a single value is visited in Algo.
public override object VisitValue([NotNull] algoParser.ValueContext context)
{
//Check what type the value is.
if (context.INTEGER() != null)
{
//INTEGER
return(new AlgoValue()
{
Type = AlgoValueType.Integer,
Value = BigInteger.Parse(context.INTEGER().GetText()),
});
}
else if (context.FLOAT() != null)
{
//FLOAT
return(new AlgoValue()
{
Type = AlgoValueType.Float,
Value = BigFloat.Parse(context.FLOAT().GetText()),
});
}
else if (context.STRING() != null)
{
//STRING
return(new AlgoValue()
{
Type = AlgoValueType.String,
Value = context.STRING().GetText().Substring(1, context.STRING().GetText().Length - 2)
//text escape codes
.Replace("\\n", "\n")
.Replace("\\t", "\t")
.Replace("\\r", "\r")
.Replace("\\q", "\"")
});
}
else if (context.RATIONAL() != null)
{
//RATIONAL
//Get the two integer halves from the rational.
string[] halves = context.RATIONAL().GetText().Split('/');
string numerator = halves[0];
string denominator = halves[1];
return(new AlgoValue()
{
Type = AlgoValueType.Rational,
Value = new BigRational(BigInteger.Zero, new Fraction(BigInteger.Parse(numerator), BigInteger.Parse(denominator))),
});
}
else if (context.BOOLEAN() != null)
{
//BOOLEAN
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = (context.BOOLEAN().GetText() == "true"),
});
}
else if (context.HEX() != null)
{
//BYTES
return(new AlgoValue()
{
Type = AlgoValueType.Bytes,
Value = context.HEX().GetText().ToByteArray()
});
}
else if (context.NULL() != null)
{
//NULL VALUE
return(new AlgoValue()
{
Type = AlgoValueType.Null,
Value = null,
});
}
else if (context.IDENTIFIER() != null)
{
//VARIABLE/OBJECT
return(Particles.ParseParticleBlock(this, context, context.IDENTIFIER(), context.particle()));
}
else if (context.stat_functionCall() != null)
{
//FUNCTION CALL
AlgoValue value = (AlgoValue)VisitStat_functionCall(context.stat_functionCall());
if (value != null)
{
return(value);
}
else
{
//Return a null value.
return(new AlgoValue()
{
Type = AlgoValueType.Null,
Value = null,
});
}
}
else if (context.array() != null)
{
//LIST.
//Evaluate all list items as expressions.
List <AlgoValue> list = new List <AlgoValue>();
foreach (var item in context.array().value())
{
list.Add((AlgoValue)VisitValue(item));
}
//Return as a single value.
return(new AlgoValue()
{
Type = AlgoValueType.List,
Value = list
});
}
else if (context.@object() != null)
{
//OBJECT DEFINITION
//Create a new object.
AlgoObject toReturn = new AlgoObject();
//Anything to enumerate?
if (context.@object().obj_child_definitions() == null)
{
//Nope.
return(new AlgoValue()
{
Type = AlgoValueType.Object,
Value = toReturn
});
}
//Enumerate through all the define statements and evaluate their values.
foreach (var value in context.@object().obj_child_definitions().obj_vardefine())
{
//Check if the variable already exists.
if (toReturn.ObjectScopes.VariableExists(value.IDENTIFIER().GetText()))
{
Error.Fatal(context, "The variable with name '" + value.IDENTIFIER().GetText() + "' is defined twice or more in an object.");
return(null);
}
//Evaluate the value on the right.
AlgoValue evaluated = (AlgoValue)VisitExpr(value.expr());
//Add the variable to scope.
toReturn.ObjectScopes.AddVariable(value.IDENTIFIER().GetText(), evaluated);
}
//Enumerate through all functions and define them.
foreach (var value in context.@object().obj_child_definitions().obj_funcdefine())
{
//Check if the variable already exists.
if (toReturn.ObjectScopes.VariableExists(value.IDENTIFIER().GetText()))
{
Error.Fatal(context, "The variable with name '" + value.IDENTIFIER().GetText() + "' is defined twice or more in an object.");
return(null);
}
//Create a list of parameters.
List <string> params_ = new List <string>();
if (value.abstract_params() != null)
{
foreach (var param in value.abstract_params().IDENTIFIER())
{
//Check if param already exists.
if (params_.Contains(param.GetText()))
{
Error.Fatal(context, "The parameter with name '" + param.GetText() + "' is already defined in the function.");
return(null);
}
params_.Add(param.GetText());
}
}
//Create a function, push.
AlgoFunction func = new AlgoFunction(value.statement().ToList(), params_, value.IDENTIFIER().GetText());
AlgoValue funcValue = new AlgoValue()
{
Type = AlgoValueType.Function,
Value = func,
};
toReturn.ObjectScopes.AddVariable(value.IDENTIFIER().GetText(), funcValue);
}
//Enumerate all external functions defined.
foreach (var ext in context.@object().obj_child_definitions().obj_externdefine())
{
//Get the value of the function.
var loadFuncStat = ext.stat_loadFuncExt();
AlgoValue func = Plugins.GetEmulatedFuncValue(loadFuncStat);
//Check if a variable with this name already exists.
if (toReturn.ObjectScopes.VariableExists(loadFuncStat.IDENTIFIER()[0].GetText()))
{
Error.Fatal(context, "A variable with the name '" + loadFuncStat.IDENTIFIER()[0].GetText() + "' already exists in this object. Cannot duplicate.");
return(null);
}
//Add that function to the return object.
toReturn.ObjectScopes.AddVariable(loadFuncStat.IDENTIFIER()[0].GetText(), func);
}
//Return the object.
return(new AlgoValue()
{
Type = AlgoValueType.Object,
Value = toReturn
});
}
else
{
//No proper detected value type.
Error.Fatal(context, "Unknown or invalid type given for value.");
return(new AlgoValue()
{
Type = AlgoValueType.Null,
Value = null
});
}
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.value"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitValue([NotNull] algoParser.ValueContext context)
{
}
