// A set command: explicitly setting a value to an expression
// <<set $foo to 1>>
public override int VisitSetVariableToValue(YarnSpinnerParser.SetVariableToValueContext context)
{
// add the expression (whatever it resolves to)
Visit(context.expression());
// now store the variable and clean up the stack
string variableName = context.VAR_ID().GetText();
compiler.Emit(OpCode.StoreVariable, new Operand(variableName));
compiler.Emit(OpCode.Pop);
return(0);
}
public override Yarn.Type VisitSetVariableToValue([NotNull] YarnSpinnerParser.SetVariableToValueContext context)
{
var expressionType = Visit(context.expression());
var variableType = Visit(context.variable());
var variableName = context.variable().GetText();
if (expressionType == Yarn.Type.Undefined)
{
// We don't know what this is set to, so we'll have to
// assume it's ok. Return the variable type, if known.
return(variableType);
}
if (variableType == Yarn.Type.Undefined)
{
// We don't have a type for this variable. Create an
// implicit declaration that it's this type.
// Get the position of this reference in the file
int positionInFile = context.Start.Line;
// The start line of the body is the line after the delimiter
int nodePositionInFile = this.currentNodeContext.BODY_START().Symbol.Line + 1;
var decl = new Declaration {
Name = variableName,
DeclarationType = Declaration.Type.Variable,
Description = $"{System.IO.Path.GetFileName(sourceFileName)}, node {currentNodeName}, line {positionInFile - nodePositionInFile}",
ReturnType = expressionType,
DefaultValue = DefaultValueForType(expressionType),
SourceFileName = sourceFileName,
SourceFileLine = positionInFile,
SourceNodeName = currentNodeName,
SourceNodeLine = positionInFile - nodePositionInFile,
IsImplicit = true,
};
NewDeclarations.Add(decl);
}
else if (expressionType != variableType)
{
throw new TypeException(context, $"{variableName} ({variableType}) cannot be assigned a {expressionType}", sourceFileName);
}
return(expressionType);
}
/// <summary>
/// Visit a parse tree produced by the <c>setVariableToValue</c>
/// labeled alternative in <see cref="YarnSpinnerParser.set_statement"/>.
/// <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 VisitSetVariableToValue([NotNull] YarnSpinnerParser.SetVariableToValueContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>setVariableToValue</c>
/// labeled alternative in <see cref="YarnSpinnerParser.set_statement"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitSetVariableToValue([NotNull] YarnSpinnerParser.SetVariableToValueContext context)
{
}
