public static object Apply(object command, Water.List args)
{
if (command is Water.List)
{
Water.List list = (Water.List)command;
object command2 = Apply(list.First(), list.NotFirst());
//TODO I don't like this.
if (command2 == null && args.Count == 0)
{
return(null);
}
return(Apply(command2, args));
}
else if (command is Water.Identifier)
{
Water.Identifier identifier = (Water.Identifier)command;
object command2 = Evaluate(identifier);
if (command2 == null)
{
throw new Water.Error(identifier.Value + " is not defined.");
}
return(Apply(command2, args));
}
else
{
Water.Operator op = (Water.Operator)command;
return(op.Evaluate(args));
}
}
/// <summary>
/// Evaluates any type of object.
/// </summary>
/// <param name="o"></param>
/// <returns></returns>
public static object Evaluate(object o)
{
if (o is Water.List)
{
Water.List list = (Water.List)o;
return(Apply(list.First(), list.NotFirst()));
}
else if (o is Water.Identifier)
{
return(EvaluateIdentifier((Water.Identifier)o));
}
else if (o is string)
{
return(EvaluateString((string)o));
}
else if (o is Water.Quote)
{
Water.Quote quote = (Water.Quote)o;
return(quote.Evaluate(new Water.List()));
}
else
{
return(o);
}
}
public override object Evaluate(Water.List expressions)
{
//Push a stack frame
Water.Environment.Push();
// Evaluate local variables.
Water.List expressions_to_eval = expressions.Copy();
Water.List values = new Water.List();
bool hasRest = false;
foreach (Water.Identifier parameter in this.Parameters)
{
if (hasRest)
{
throw new Water.Error("Cannot have parameters after a rest parameter in function " + this._name);
}
if (IsRest(parameter))
{
//Add the rest.
Water.List rest = new Water.List();
foreach (object expression in expressions_to_eval)
{
rest.Add(Water.Evaluator.Evaluate(expression));
}
expressions_to_eval.Clear();
values.Add(rest);
hasRest = true;
}
else if (IsOptional(parameter))
{
//If it doesn't exist add null.
if (expressions_to_eval.Count == 0)
{
values.Add(null);
}
else
{
object value = Water.Evaluator.Evaluate(expressions_to_eval.First());
values.Add(value);
expressions_to_eval = expressions_to_eval.NotFirst();
}
}
else if (IsUnevaluated(parameter))
{
values.Add(expressions_to_eval.First());
expressions_to_eval = expressions_to_eval.NotFirst();
}
else
{
//Throw exception if null.
if (expressions_to_eval.Count == 0)
{
throw new Water.Error("Parameter is required: " + parameter.Value);
}
else
{
object value = Water.Evaluator.Evaluate(expressions_to_eval.First());
if (value == null)
{
throw new Water.Error("Parameter is required: " + parameter.Value);
}
values.Add(value);
expressions_to_eval = expressions_to_eval.NotFirst();
}
}
}
if (expressions_to_eval.Count > 0)
{
throw new Water.Error("Too many expressions passed to function: " + this._name);
}
// Push local variables.
int i = 0;
foreach (Water.Identifier parameter in this.Parameters)
{
if (Water.Environment.IsConstant(parameter.Value))
{
throw new Water.Error("Constant \"" + parameter.Value + "\" is already defined.");
}
if (IsOptional(parameter))
{
string name = GetOptional(parameter);
Water.Environment.DefineVariable(name, values[i]);
}
else if (IsRest(parameter))
{
string name = GetRest(parameter);
Water.Environment.DefineVariable(name, values[i]);
}
else if (IsUnevaluated(parameter))
{
string name = GetUnevaluated(parameter);
Water.Environment.DefineVariable(name, values[i]);
}
else
{
Water.Environment.DefineVariable(parameter.Value, values[i]);
}
i++;
}
//Interpret the function.
Water.Interpreter.Interpret(new StatementIterator(this.Statements, false));
//Pop a stack frame.
Water.Environment.Pop();
object returnValue = Water.Environment.ReturnValue;
Water.Environment.Return = false;
Water.Environment.ReturnValue = null;
return(returnValue);
}
public override void Evaluate(Water.List expressions, Water.List statements)
{
if (expressions.Count != 0)
{
//TODO throw new Water.Error("Invalid arguments.\n\t" + expressions.ToString());
}
string exception_name = null;
Water.Dictionary block = new Water.Dictionary(); // TODO block = GroupBlock(tags);
Water.List try_block = new Water.List();
block["try"] = try_block;
Water.List current_block = try_block;
foreach (Water.Statement block_statement in statements)
{
//TODO use generics
Water.List statement = (Water.List)block_statement.Expression;
if (statement.First() is Water.Identifier)
{
string tag = ((Water.Identifier)statement.First()).Value;
if (statement.Count == 2 && tag.Equals("catch")) // && depth == 0
{
//TODO check the number of expressions.
Water.List catch_block = new Water.List();
block["catch"] = catch_block;
current_block = catch_block;
exception_name = ((Water.Identifier)statement[1]).Value;
}
else
{
current_block.Add(block_statement);
}
}
else
{
current_block.Add(block_statement);
}
}
if (exception_name == null)
{
//TODO throw exception.
}
try
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["try"], false));
}
catch (System.Reflection.TargetInvocationException exception)
{
Water.Environment.Push();
Water.Environment.DefineVariable(exception_name, exception.InnerException);
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["catch"], false));
Water.Environment.Pop();
}
catch (System.Exception exception)
{
Water.Environment.Push();
Water.Environment.DefineVariable(exception_name, exception);
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["catch"], false));
Water.Environment.Pop();
}
}
public override void Evaluate(Water.List expressions, Water.List statements)
{
if (expressions.Count != 1)
{
throw new Water.Error("Invalid arguments.\n\t" + expressions.ToString());
}
Water.Dictionary block = new Water.Dictionary();
block["else_if"] = new Water.List();
Water.List if_block = new Water.List();
block["if"] = if_block;
Water.List current_block = if_block;
foreach (Water.Statement block_statement in statements)
{
Water.List statement = (Water.List)block_statement.Expression;
if (statement.First() is Water.Identifier)
{
string tag = ((Water.Identifier)statement.First()).Value;
if (tag.Equals("if"))
{
current_block.Add(block_statement);
}
else if (statement.Count == 2 && tag.Equals("else_if"))
{
Water.Dictionary else_if_block = new Water.Dictionary();
//TODO use generics
((Water.List)block["else_if"]).Add(else_if_block);
else_if_block["Expressions"] = statement.NotFirst().First();
Water.List else_if_block_statements = new Water.List();
else_if_block["Statements"] = else_if_block_statements;
current_block = else_if_block_statements;
}
else if (statement.Count == 1 && tag.Equals("else")) // && depth == 0
{
Water.List else_block = new Water.List();
block["else"] = else_block;
current_block = else_block;
}
else if (statement.Count == 1 && tag.Equals("end_if"))
{
current_block.Add(block_statement);
}
else
{
current_block.Add(block_statement);
}
}
else
{
current_block.Add(block_statement);
}
}
if (Water.Evaluator.EvaluateBoolean(expressions[0]))
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["if"], false));
return;
}
//TODO use generics
foreach (Water.Dictionary elseIf in (Water.List)block["else_if"])
{
if (Water.Evaluator.EvaluateBoolean(elseIf["Expressions"]))
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)elseIf["Statements"], false));
return;
}
}
if (block["else"] != null)
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["else"], false));
return;
}
}
public override void Evaluate(Water.List expressions, Water.List statements)
{
if (expressions.Count != 1)
{
throw new Water.Error("Invalid arguments.\n\t" + expressions.ToString());
}
object switch_expression = Water.Evaluator.Evaluate(expressions[0]);
Water.Dictionary block = new Water.Dictionary();
block["case"] = new Water.List();
Water.List current_block = null;
int depth = 0;
foreach (Water.Statement block_statement in statements)
{
//TODO use generics
Water.List statement = (Water.List)block_statement.Expression;
if (statement.Count == 2 && statement.First() is Water.Identifier && ((Water.Identifier)statement.First()).Value.Equals("case"))
{
Water.Dictionary case_block = new Water.Dictionary();
//TODO use generics
((Water.List)block["case"]).Add(case_block);
case_block["Expressions"] = statement.NotFirst().First();
Water.List case_block_statements = new Water.List();
case_block["Statements"] = case_block_statements;
current_block = case_block_statements;
}
else if (statement.First() is Water.Identifier)
{
string tag = ((Water.Identifier)statement.First()).Value;
if (tag.Equals("switch"))
{
current_block.Add(block_statement);
depth++;
}
//TODO No good.
else if (statement.Count == 1 && tag.Equals("end_switch"))
{
current_block.Add(block_statement);
depth--;
}
else if (statement.Count == 1 && tag.Equals("default") && depth == 0)
{
Water.List default_block = new Water.List();
block["default"] = default_block;
current_block = default_block;
}
else
{
current_block.Add(block_statement);
}
}
else
{
if (current_block == null)
{
//TODO file, line, column.
throw new Water.Error("Invalid statement in switch statement.");
}
current_block.Add(block_statement);
}
}
//TODO use generics
foreach (Water.Dictionary case_ in (Water.List)block["case"])
{
if (switch_expression.Equals(Water.Evaluator.Evaluate(case_["Expressions"])))
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)case_["Statements"], false));
return;
}
}
if (block["default"] != null)
{
//TODO use generics
Water.Interpreter.Interpret(new StatementIterator((Water.List)block["default"], false));
return;
}
}