public override Node VisitAssignmentExpression(DustParser.AssignmentExpressionContext context)
{
Expression left = (Expression)Visit(context.expression(0));
Expression right = (Expression)Visit(context.expression(1));
if (!(left is IdentifierExpression))
{
visitorContext.ErrorHandler.ThrowError(new SyntaxError("Assignment target must be a mutable property.", context.GetRange()));
return(null);
}
if (!((IdentifierExpression)left).IsMutable)
{
visitorContext.ErrorHandler.ThrowError(new SyntaxError($"Property '{((IdentifierExpression) left).Name}' is not mutable.", context.GetRange()));
return(null);
}
return(new AssignmentExpression(left, right, context.GetRange()));
}
/// <summary>
/// Visit a parse tree produced by the <c>AssignmentExpression</c>
/// labeled alternative in <see cref="DustParser.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 VisitAssignmentExpression([NotNull] DustParser.AssignmentExpressionContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>AssignmentExpression</c>
/// labeled alternative in <see cref="DustParser.expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitAssignmentExpression([NotNull] DustParser.AssignmentExpressionContext context)
{
}