public override TranslationResult Translate(TranslationContext context)
{
var symbol = context.Semantics.GetDeclaredSymbol(this.variable);
var identifier = context.Process.IdentifierTranslator.RegisterAndGetIdentifier(symbol);
Error err;
List <Error> errors = new List <Error>();
VarStatementSilvernode intro =
new VarStatementSilvernode(identifier,
TypeTranslator.TranslateType(
context.Semantics.GetSymbolInfo(this.typeSyntax).Symbol as ITypeSymbol, this.typeSyntax,
out err), this.OriginalNode);
if (err != null)
{
errors.Add(err);
}
if (this.initialValue == null)
{
return(TranslationResult.FromSilvernode(intro, errors));
}
// Add assignment if there is an initial value.
var res = this.initialValue.Translate(context.ChangePurityContext(PurityContext.Purifiable));
AssignmentSilvernode assignmentSilvernode =
new AssignmentSilvernode(new IdentifierSilvernode(identifier), res.Silvernode, this.OriginalNode);
errors.AddRange(res.Errors);
return(TranslationResult.FromSilvernode(new StatementsSequenceSilvernode(this.OriginalNode,
intro,
new StatementsSequenceSilvernode(null, res.PrependTheseSilvernodes.ToArray()),
assignmentSilvernode), errors));
}
/// <summary>
/// This is called when an invocation sharpnode determines that this silvernode must be a statement in Viper code; this method
/// then, if in <see cref="PurityContext.PureOrFail"/> context, changes this result into an error; or, if in <see cref="PurityContext.Purifiable"/>
/// context, moves this result's <see cref="Silvernode"/> to <see cref="PrependTheseSilvernodes"/> and performs the prepending.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="type">The Silver type of this silvernode.</param>
/// <param name="impurityReason">The reason why this silvernode must be a statement.</param>
internal void AsImpureAssertion(TranslationContext context, SilverType type, string impurityReason)
{
switch (context.PurityContext)
{
case PurityContext.PureOrFail:
this.Errors.Add(new Error(Diagnostics.SSIL114_NotPureContext, this.Silvernode.OriginalNode, impurityReason));
break;
case PurityContext.Purifiable:
var newTempVar = context.Process.IdentifierTranslator.RegisterNewUniqueIdentifier();
VarStatementSilvernode v = new VarStatementSilvernode(newTempVar, type, null);
AssignmentSilvernode a = new AssignmentSilvernode(new IdentifierSilvernode(newTempVar),
this.Silvernode, null);
this.PrependTheseSilvernodes.Add(v);
this.PrependTheseSilvernodes.Add(a);
this.Silvernode = new IdentifierSilvernode(newTempVar);
break;
case PurityContext.PurityNotRequired:
break;
}
}
