protected virtual ParenthesizedExpressionNode ParseParenthesizedExpression(IPrimaryParentNode parent, SpecialCharacterToken leftParenthesis)
{
// PARSE: '(' <expression> ')'
ParenthesizedExpressionNode result = new ParenthesizedExpressionNode(parent, leftParenthesis);
Token token = this.GetNextTokenxx(Preference.NegativeSign);
ExpressionNode expression = this.ParseExpression(result, token);
if (expression == null)
{
this.ReportParserError(result, SemanticErrors.MissingExpression, token);
return(result);
}
// Ensure the parentheses are properly closed.
token = this.GetNextTokenxx(Preference.Default);
SpecialCharacterToken rightParenthesis = null;
if (Parser.IsClosingParenthesis(token))
{
rightParenthesis = (SpecialCharacterToken)token;
}
else
{
this.ReportParserError(result, SemanticErrors.MissingExpressionClosingParenthesis, token);
this.ResidueToken = token;
}
result.SetContents(expression, rightParenthesis);
return(result);
}
protected virtual ArrayLiteralNode ParseArrayLiteral(ILiteralNodeParent parent, SpecialCharacterToken arrayToken)
{
// PARSE: <array literal> ::= '#(' <array element>* ')'
// <array element> ::= <literal> | identifier
Token token = this.GetNextTokenxx(Preference.Default);
if (!Parser.IsOpeningParenthesis(token))
{
this.ReportParserError(parent, SemanticErrors.MissingLiteralArrayOpeningParenthesis, token);
// The hash token is thrown away and lost :-/ ... only the current token is passed on.
this.ResidueToken = token;
return(null);
}
List <LiteralNode> elements = new List <LiteralNode>();
ArrayLiteralNode result = new ArrayLiteralNode(parent, arrayToken, (SpecialCharacterToken)token);
// Process tokens inside the array ...
while (true)
{
// ... get next token in the array ...
token = this.GetNextTokenxx(Preference.NegativeSign | Preference.UnquotedSelector);
// Is this closing parenthesis?
if (Parser.IsClosingParenthesis(token))
{
// Closing parenthesis ... done with the array, return litral array node.
result.SetContents(elements, (SpecialCharacterToken)token);
this.ResidueToken = null;
return(result);
}
if (token is EofToken)
{
// Unfinished source code ... return
result.SetContents(elements, null);
this.ReportParserError(parent, SemanticErrors.MissingLiteralArrayClosingParenthesis, token);
this.ResidueToken = token;
return(result);
}
// PARSE: <array element> ::= <literal> | identifier
if (token is ILiteralArrayIdentifierToken)
{
// identifier ... special case only inside arrays.
elements.Add(new IdentifierLiteralNode(result, (ILiteralArrayIdentifierToken)token));
}
else
{
// ... it's not identifier, so it must be an literal
LiteralNode element = this.ParseLiteral(result, token);
if (element == null)
{
// Report error in source code ... here, it must be a literal
this.ReportParserError(result, SemanticErrors.UnrecognizedLiteral, token);
result.SetContents(elements, null);
return(result);
}
else
{
// ... add the child element to the array elements.
elements.Add(element);
}
}
}
}