Proposal for SentinelInputRange

[Walter Bright]

On 2/28/2013 7:38 AM, Dmitry Olshansky wrote:
> 28-Feb-2013 14:44, Walter Bright пишет:
>> On 2/28/2013 12:25 AM, Jacob Carlborg wrote:
>>> On 2013-02-28 08:23, Walter Bright wrote:
>>>
>>>> There is always a terminating 0, even if the file ends in 0x1a.
>>>>
>>>> (The 0x1A comes from some old editors that end a file with a control Z.)
>>>
>>> http://dlang.org/lex.html, "End of File" shows this:
>>>
>>> EndOfFile:
>>>      physical end of the file
>>>      \u0000
>>>      \u001A
>>>
>>> Doesn't that mean that the input is empty if the file is empty, \u0000
>>> or \u001A
>>> is encountered?
>>>
>>
>
>
>> Please follow the source code from file to input to the lexer.
>
> Source as spec is no good. Either change the spec or  admit that having a tuple
> of sentinels as manifest constant is fine. In any case constant tuples are
> easily unrolled into case statements.

The spec is correct, so is the code, and tuple sentinels are entirely unnecessary.