/// <summary>
/// Parses a literal value where a full expression is not allowed, such
/// as in declarations within the header (before any functions). Logs
/// an error and returns false if a literal value was not found.
/// </summary>
/// <param name="variable">Returns the resulting variable if method returns true.</param>
/// <param name="allowLineBreak">If true, a new lines is allowed before literal.
/// Set to true when parsing array initialization within curly braces.</param>
internal bool ParseLiteral(out Variable variable, bool allowLineBreak = false)
{
variable = null;
bool negate = false;
Token token = allowLineBreak ? Lexer.GetNextSkipNewLines() : Lexer.GetNext();
if (token.Type == TokenType.LeftBracket)
{
// List size
if (!ParseLiteral(out variable))
{
return(false);
}
variable = Variable.CreateList(variable.ToInteger());
// Parse right bracket
token = Lexer.GetNext();
if (token.Type != TokenType.RightBracket)
{
Error(ErrorCode.ExpectedRightBracket, token);
NextLine();
return(false);
}
return(true);
}
if (token.Type == TokenType.LeftBrace)
{
// List initializers
List <Variable> list = new List <Variable>();
do
{
if (!ParseLiteral(out variable, true))
{
return(false);
}
list.Add(variable);
token = Lexer.GetNextSkipNewLines();
} while (token.Type == TokenType.Comma);
// Parse right brace
if (token.Type != TokenType.RightBrace)
{
Error(ErrorCode.ExpectedRightBrace, token);
NextLine();
return(false);
}
variable = new Variable(list);
return(true);
}
if (token.Type == TokenType.Minus || token.Type == TokenType.Plus)
{
negate = (token.Type == TokenType.Minus);
token = Lexer.GetNext();
}
if (token.IsLiteral)
{
variable = new Variable(token);
if (negate)
{
variable = variable.Negate();
}
return(true);
}
Error(ErrorCode.ExpectedLiteral, token);
return(false);
}
public bool IsGreaterThan(Variable value) => CompareTo(value) > 0;
public bool IsGreaterThanOrEqual(Variable value) => CompareTo(value) >= 0;
public bool IsEqual(Variable value) => CompareTo(value) == 0;
public bool IsNotEqual(Variable value) => CompareTo(value) != 0;
public abstract Variable Modulus(Variable value);
public abstract Variable Concat(Variable value);
public abstract Variable Divide(Variable value);
public abstract Variable Power(Variable value);
public abstract Variable Multiply(Variable value);
public abstract Variable Subtract(Variable value);
public abstract Variable Add(Variable value);
public bool IsLessThanOrEqual(Variable value) => CompareTo(value) <= 0;
public bool IsLessThan(Variable value) => CompareTo(value) < 0;