private IEnumerable<Expression> ParseCollectionElementValueList(SourceLocationBuilder slb, TokenSet followers)
//^ ensures followers[this.currentToken] || this.currentToken == Token.EndOfFile;
{
List<Expression> elementValues = new List<Expression>();
while (this.currentToken != Token.RightBrace && this.currentToken != Token.EndOfFile) {
Expression elementValue;
if (this.currentToken == Token.LeftBrace) {
IEnumerable<Expression> nestedElementValues = Expression.EmptyCollection;
IEnumerable<NamedArgument> nestedNamedArguments = NamedArgument.EmptyCollection;
//^ assume this.currentToken == Token.LeftBrace;
this.ParseElementValuesOrNamedArguments(ref nestedElementValues, ref nestedNamedArguments, slb, followers);
if (nestedElementValues != Expression.EmptyCollection)
elementValue = new PopulateCollection(null, nestedElementValues, slb);
else if (nestedNamedArguments != NamedArgument.EmptyCollection)
elementValue = new InitializeObject(null, nestedNamedArguments, slb);
else {
this.HandleError(Error.SyntaxError); //TODO: better error
continue;
}
} else
elementValue = this.ParseExpression(followers|Token.Comma);
elementValues.Add(elementValue);
if (this.currentToken != Token.Comma) break;
this.GetNextToken();
}
elementValues.TrimExcess();
IEnumerable<Expression> result = elementValues.AsReadOnly();
this.SkipTo(followers);
return result;
}
private IEnumerable<NamedArgument> ParseNamedArgumentList(SourceLocationBuilder slb, TokenSet followers)
//^ requires Parser.IdentifierOrNonReservedKeyword[this.currentToken];
//^ ensures followers[this.currentToken] || this.currentToken == Token.EndOfFile;
{
List<NamedArgument> namedArguments = new List<NamedArgument>();
while (Parser.IdentifierOrNonReservedKeyword[this.currentToken]) {
SimpleName argumentName = this.ParseSimpleName(followers|Token.Comma);
this.Skip(Token.Assign);
Expression argumentValue;
if (this.currentToken == Token.LeftBrace) {
IEnumerable<Expression> nestedElementValues = Expression.EmptyCollection;
IEnumerable<NamedArgument> nestedNamedArguments = NamedArgument.EmptyCollection;
//^ assume this.currentToken == Token.LeftBrace;
this.ParseElementValuesOrNamedArguments(ref nestedElementValues, ref nestedNamedArguments, slb, followers);
if (nestedElementValues != Expression.EmptyCollection)
argumentValue = new PopulateCollection(null, nestedElementValues, slb);
else if (nestedNamedArguments != NamedArgument.EmptyCollection)
argumentValue = new InitializeObject(null, nestedNamedArguments, slb);
else {
this.HandleError(Error.SyntaxError); //TODO: better error
continue;
}
} else
argumentValue = this.ParseExpression(followers|Token.Comma);
namedArguments.Add(new NamedArgument(argumentName, argumentValue, slb));
if (this.currentToken != Token.Comma) break;
this.GetNextToken();
}
namedArguments.TrimExcess();
IEnumerable<NamedArgument> result = namedArguments.AsReadOnly();
this.SkipTo(followers);
return result;
}
