public override int VisitExpTypeConversion(YarnSpinnerParser.ExpTypeConversionContext context)
{
// Evaluate the single expression, and then call the type-conversion function
Visit(context.expression());
// Push the number of parameters onto the stack
compiler.Emit(OpCode.PushFloat, new Operand(1));
string functionName;
switch (context.type().typename.Type)
{
case YarnSpinnerLexer.TYPE_STRING:
functionName = "string";
break;
case YarnSpinnerLexer.TYPE_BOOL:
functionName = "bool";
break;
case YarnSpinnerLexer.TYPE_NUMBER:
functionName = "number";
break;
default:
throw new ParseException($"Cannot convert {context.expression().GetText()} to {context.type().GetText()}: unknown type");
}
// Call the function
compiler.Emit(OpCode.CallFunc, new Operand(functionName));
return(0);
}
public override Yarn.Type VisitExpTypeConversion(YarnSpinnerParser.ExpTypeConversionContext context)
{
// Validate the type of the expression; the actual conversion
// will be done at runtime, and may fail depending on the
// actual value
Visit(context.expression());
// Return a value whose type depends on which type we're using
switch (context.type().typename.Type)
{
case YarnSpinnerLexer.TYPE_NUMBER:
return(Yarn.Type.Number);
case YarnSpinnerLexer.TYPE_STRING:
return(Yarn.Type.String);
case YarnSpinnerLexer.TYPE_BOOL:
return(Yarn.Type.Bool);
default:
throw new ArgumentOutOfRangeException($"Unsupported type {context.type().GetText()}");
}
}
/// <summary>
/// Exit a parse tree produced by the <c>expTypeConversion</c>
/// labeled alternative in <see cref="YarnSpinnerParser.expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitExpTypeConversion([NotNull] YarnSpinnerParser.ExpTypeConversionContext context)
{
}
/// <summary>
/// Visit a parse tree produced by the <c>expTypeConversion</c>
/// labeled alternative in <see cref="YarnSpinnerParser.expression"/>.
/// <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 VisitExpTypeConversion([NotNull] YarnSpinnerParser.ExpTypeConversionContext context)
{
return(VisitChildren(context));
}
