private AstItem ReadArray(TokenIterator tokens)
{
tokens.PopExpected(TokenKind.SquareBracketOpen);
var firstValue = ReadExpression(tokens, new List <TokenKind> {
TokenKind.SemiColon, TokenKind.Comma
});
var token = tokens.Pop();
if (token.Kind == TokenKind.SquareBracketClose)
{
//Array with only single value
return(AstItem.ValueArrayDefinition(new List <AstItem>()
{
firstValue
}));
}
if (token.Kind == TokenKind.Comma)
{
//Array definition with n values
var valueTokens = ReadBreaketedList(tokens, TokenKind.SquareBracketOpen, TokenKind.SquareBracketClose, TokenKind.Comma);
var valueExpressions = new List <AstItem>(valueTokens.Count + 1)
{
firstValue
};
foreach (var tokenList in valueTokens)
{
var iterator = new TokenIterator(tokenList);
var valueItem = ReadExpression(iterator, null);
valueExpressions.Add(valueItem);
}
return(AstItem.ValueArrayDefinition(valueExpressions));
}
else if (token.Kind == TokenKind.SemiColon)
{
//Array definition with one value and number of items
var numItemsExpression = ReadExpression(tokens, TokenKind.SquareBracketClose);
return(AstItem.SizedArrayDefinition(firstValue, numItemsExpression));
}
throw new Exception("Unexpected token in array definition: " + token);
}