IMaybe <int> getTerm(Block block, int index)
{
index = ignoreReturns(index);
if (ifExpressionParser.Scan(source, index))
{
block.Add(ifExpressionParser.Verb);
return(ifExpressionParser.Position.Some());
}
while (prefixOperatorParser.Scan(source, index))
{
block.Add(prefixOperatorParser.Verb);
index = prefixOperatorParser.Position;
}
index = ignoreReturns(index);
if (valueParser.Scan(source, index))
{
block.Add(valueParser.Verb);
index = valueParser.Position;
}
else
{
return(none <int>());
}
index = ignoreReturns(index);
while (postfixOperatorParser.Scan(source, index))
{
block.Add(postfixOperatorParser.Verb);
index = postfixOperatorParser.Position;
index = ignoreReturns(index);
}
return(index.Some());
}
