public bool InterpreteNextAST()
{
if (Input.IsEnd())
{
return(false);
}
try
{
switch (Input.Peek().ASTType)
{
// Valid cases...
case AST.Classification.Say:
InterpreteSay();
return(true);
case AST.Classification.Set:
InterpreteSet();
return(true);
case AST.Classification.Choice:
InterpreteChoice();
return(true);
case AST.Classification.Label:
InterpreteLabel();
return(true);
case AST.Classification.Jump:
InterpreteJump();
return(true);
case AST.Classification.Return:
InterpreteReturn();
return(true);
case AST.Classification.LineBreak:
break;
// Some invalid cases... Not a statement.
case AST.Classification.Identifier:
throw new InvalidStatementPassedException("An identifier cannot be used as a statement.");
case AST.Classification.String:
throw new InvalidStatementPassedException("A string cannot be used as a statement.");
case AST.Classification.Boolean:
throw new InvalidStatementPassedException("A boolean value cannot be used as a statement.");
case AST.Classification.Number:
throw new InvalidStatementPassedException("A number value cannot be used as a statement.");
case AST.Classification.Of:
throw new InvalidStatementPassedException("Of statements cannot be used alone. They must be used with Set statements.");
default:
throw new InvalidStatementPassedException($"Invalid statement AST {Input.Peek().ASTType} was passed. An element such as Number cannot be a statement.");
}
if (Input.Peek().ASTType != AST.Classification.LineBreak)
{
throw new InvalidStatementPassedException("Each statements must be separated by line break.");
}
Input.Read(); // Remove the line break AST
}
catch (Exception e)
{
OutputManager.Exception(e);
}
return(true);
}
// Parse statements
public AST ParseSay()
{
AST result = null;
if (Input.IsEnd(3))
{
return(result);
}
Token Speaker = Input.Read(), Colon = Input.Read(), Conversation = Input.Read();
if (Colon.TokenType == Token.Classification.Punctuation && Colon.Content == ":" &&
Conversation.TokenType == Token.Classification.String)
{
result = AST.CreateSayAST(AST.CreateIdentifierAST(Speaker.Content), AST.CreateStringAST(Conversation.Content));
}
return(result);
}
