private Expression ParseNamespaceOrTypeName(bool allowEmptyArguments, TokenSet followers)
//^ ensures followers[this.currentToken] || this.currentToken == Token.EndOfFile;
//^ ensures result is SimpleName || result is AliasQualifiedName || result is QualifiedName || result is GenericTypeInstanceExpression;
{
SimpleName rootName = this.ParseSimpleName(followers|Token.Dot|Token.DoubleColon|Token.LessThan);
Expression expression = rootName;
if (rootName.Name.UniqueKey == this.nameTable.global.UniqueKey && this.currentToken == Token.DoubleColon)
expression = new RootNamespaceExpression(rootName.SourceLocation);
SourceLocationBuilder sctx = new SourceLocationBuilder(expression.SourceLocation);
if (this.currentToken == Token.DoubleColon) {
this.GetNextToken();
SimpleName simpleName = this.ParseSimpleName(followers|Token.Dot|Token.LessThan);
sctx.UpdateToSpan(simpleName.SourceLocation);
expression = new AliasQualifiedName(expression, simpleName, sctx.GetSourceLocation());
}
//^ assume expression is SimpleName || expression is AliasQualifiedName; //RootNamespace will always disappear into AliasQualifiedName
moreDots:
while (this.currentToken == Token.Dot)
//^ invariant expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName || expression is GenericTypeInstanceExpression;
{
this.GetNextToken();
SimpleName simpleName = this.ParseSimpleName(followers|Token.Dot|Token.LessThan);
sctx.UpdateToSpan(simpleName.SourceLocation);
expression = new QualifiedName(expression, simpleName, sctx.GetSourceLocation());
}
if (this.currentToken == Token.LessThan) {
//^ assume expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName; //Can only get back here if generic instance was followed by dot.
TypeExpression genericType = new NamedTypeExpression(expression);
while (this.currentToken == Token.LessThan)
//^ invariant expression is SimpleName || expression is AliasQualifiedName || expression is QualifiedName || expression is GenericTypeInstanceExpression;
{
List<TypeExpression> arguments = this.ParseTypeArguments(sctx, allowEmptyArguments, followers|Token.Dot);
expression = new GenericTypeInstanceExpression(genericType, arguments.AsReadOnly(), sctx.GetSourceLocation());
}
if (this.currentToken == Token.Dot) goto moreDots;
}
if (this.insideType && !this.insideBlock && !followers[this.currentToken])
this.SkipTo(followers, Error.InvalidMemberDecl, this.scanner.GetTokenSource());
else
this.SkipTo(followers);
return expression;
}
private Expression ParseImplementedInterfacePlusName(ref NameDeclaration name, bool allowThis, TokenSet followers)
//^ ensures result is SimpleName || result is QualifiedName;
//^ ensures result is QualifiedName ==> (((QualifiedName)result).Qualifier is SimpleName ||
//^ ((QualifiedName)result).Qualifier is QualifiedName || ((QualifiedName)result).Qualifier is GenericTypeInstanceExpression);
{
Expression implementedInterface = new SimpleName(name, name.SourceLocation, false);
while (this.currentToken == Token.Dot || this.currentToken == Token.LessThan)
//^ invariant implementedInterface is SimpleName || implementedInterface is QualifiedName;
//The following invariant does not hold, it seems. Fix it.
//^ invariant implementedInterface is QualifiedName ==> (((QualifiedName)implementedInterface).Qualifier is SimpleName ||
//^ ((QualifiedName)implementedInterface).Qualifier is QualifiedName || ((QualifiedName)implementedInterface).Qualifier is GenericTypeInstanceExpression);
{
if (this.currentToken == Token.LessThan) {
//^ assume implementedInterface is SimpleName || implementedInterface is QualifiedName;
TypeExpression genericType = new NamedTypeExpression(implementedInterface);
SourceLocationBuilder ctx = new SourceLocationBuilder(implementedInterface.SourceLocation);
List<TypeExpression> typeArguments = this.ParseTypeArguments(ctx, false, followers|Token.Dot|Token.LeftBrace);
implementedInterface = new GenericTypeInstanceExpression(genericType, typeArguments, ctx);
}
this.Skip(Token.Dot);
if (this.currentToken == Token.This && allowThis) {
name = this.GetNameDeclarationFor("Item", this.scanner.SourceLocationOfLastScannedToken);
} else {
if (!Parser.IdentifierOrNonReservedKeyword[this.currentToken])
this.SkipTo(followers|Parser.IdentifierOrNonReservedKeyword|Token.LeftBrace, Error.ExpectedIdentifier);
name = this.ParseNameDeclaration();
}
SourceLocationBuilder ctx1 = new SourceLocationBuilder(implementedInterface.SourceLocation);
ctx1.UpdateToSpan(name.SourceLocation);
implementedInterface = new QualifiedName(implementedInterface, new SimpleName(name, name.SourceLocation, false), ctx1);
}
return implementedInterface;
}