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December 18, 2014 std.file.readText() extra Line Feed character | ||||
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Why does std.file.readText() append a Line Feed char onto the end of the string? I have a file with the following contents in it: Name = Int Other=Float One More = String(Random;) I then have the code: void main(string[] args){ const text = "Name = Int Other=Float One More = String(Random;)"; string input = readText(args[1]); writefln("Raw data"); writefln("D) %s", cast(ubyte[])text[$-5..$]); writefln("File) %s", cast(ubyte[])input[$-5..$]); } This produces: Raw data D) [100, 111, 109, 59, 41] File) [111, 109, 59, 41, 10] Any Idea why the reading from the File adds on that extra '10' character? I don't think it's my editor adding chars to the end of the file, as I'm using vi. |
December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin Attachments: | On Thu, 18 Dec 2014 09:18:35 +0000 Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote: > Why does std.file.readText() append a Line Feed char onto the end of the string? > > I have a file with the following contents in it: > Name = Int > Other=Float > One More = String(Random;) > > I then have the code: > > void main(string[] args){ > const text = "Name = Int > Other=Float > One More = String(Random;)"; > > string input = readText(args[1]); > > writefln("Raw data"); > writefln("D) %s", cast(ubyte[])text[$-5..$]); > writefln("File) %s", cast(ubyte[])input[$-5..$]); > > } > > This produces: > Raw data > D) [100, 111, 109, 59, 41] > File) [111, 109, 59, 41, 10] > > Any Idea why the reading from the File adds on that extra '10' character? > > I don't think it's my editor adding chars to the end of the file, as I'm using vi. you *definetely* has the last line ended with '\n'. |
December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to ketmar | On Thursday, 18 December 2014 at 09:25:47 UTC, ketmar via Digitalmars-d-learn wrote:
> On Thu, 18 Dec 2014 09:18:35 +0000
> Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
>
>> Why does std.file.readText() append a Line Feed char onto the end of the string?
>>
>> I have a file with the following contents in it:
>> Name = Int
>> Other=Float
>> One More = String(Random;)
>>
>> I then have the code:
>>
>> void main(string[] args){
>> const text = "Name = Int
>> Other=Float
>> One More = String(Random;)";
>>
>> string input = readText(args[1]);
>>
>> writefln("Raw data");
>> writefln("D) %s", cast(ubyte[])text[$-5..$]);
>> writefln("File) %s", cast(ubyte[])input[$-5..$]);
>>
>> }
>>
>> This produces:
>> Raw data
>> D) [100, 111, 109, 59, 41]
>> File) [111, 109, 59, 41, 10]
>>
>> Any Idea why the reading from the File adds on that extra '10' character?
>>
>> I don't think it's my editor adding chars to the end of the file, as I'm using vi.
>
> you *definetely* has the last line ended with '\n'.
I dont see how, I copy and pasted from the string definition in D, directly after the first " and directly before the last ".
If I look at the file in vim with line numbers turned on, the file is like this. So I really dont think I have a new line in the file...
1 Name = Int
2 Other=Float
3 One More = String(Random;)
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December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin | On Thursday, 18 December 2014 at 10:16:38 UTC, Colin wrote:
> On Thursday, 18 December 2014 at 09:25:47 UTC, ketmar via Digitalmars-d-learn wrote:
>> On Thu, 18 Dec 2014 09:18:35 +0000
>> Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
>>
>>> Why does std.file.readText() append a Line Feed char onto the end of the string?
>>>
>>> I have a file with the following contents in it:
>>> Name = Int
>>> Other=Float
>>> One More = String(Random;)
>>>
>>> I then have the code:
>>>
>>> void main(string[] args){
>>> const text = "Name = Int
>>> Other=Float
>>> One More = String(Random;)";
>>>
>>> string input = readText(args[1]);
>>>
>>> writefln("Raw data");
>>> writefln("D) %s", cast(ubyte[])text[$-5..$]);
>>> writefln("File) %s", cast(ubyte[])input[$-5..$]);
>>>
>>> }
>>>
>>> This produces:
>>> Raw data
>>> D) [100, 111, 109, 59, 41]
>>> File) [111, 109, 59, 41, 10]
>>>
>>> Any Idea why the reading from the File adds on that extra '10' character?
>>>
>>> I don't think it's my editor adding chars to the end of the file, as I'm using vi.
>>
>> you *definetely* has the last line ended with '\n'.
>
> I dont see how, I copy and pasted from the string definition in D, directly after the first " and directly before the last ".
>
> If I look at the file in vim with line numbers turned on, the file is like this. So I really dont think I have a new line in the file...
>
> 1 Name = Int
> 2 Other=Float
> 3 One More = String(Random;)
You can make sure using `hexdump -C file`. I tested locally creating a file using vi, and it does indeed have a '\n' at the end of file.
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December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to yazd | On Thursday, 18 December 2014 at 10:43:32 UTC, yazd wrote:
> On Thursday, 18 December 2014 at 10:16:38 UTC, Colin wrote:
>> On Thursday, 18 December 2014 at 09:25:47 UTC, ketmar via Digitalmars-d-learn wrote:
>>> On Thu, 18 Dec 2014 09:18:35 +0000
>>> Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:
>>>
>>>> Why does std.file.readText() append a Line Feed char onto the end of the string?
>>>>
>>>> I have a file with the following contents in it:
>>>> Name = Int
>>>> Other=Float
>>>> One More = String(Random;)
>>>>
>>>> I then have the code:
>>>>
>>>> void main(string[] args){
>>>> const text = "Name = Int
>>>> Other=Float
>>>> One More = String(Random;)";
>>>>
>>>> string input = readText(args[1]);
>>>>
>>>> writefln("Raw data");
>>>> writefln("D) %s", cast(ubyte[])text[$-5..$]);
>>>> writefln("File) %s", cast(ubyte[])input[$-5..$]);
>>>>
>>>> }
>>>>
>>>> This produces:
>>>> Raw data
>>>> D) [100, 111, 109, 59, 41]
>>>> File) [111, 109, 59, 41, 10]
>>>>
>>>> Any Idea why the reading from the File adds on that extra '10' character?
>>>>
>>>> I don't think it's my editor adding chars to the end of the file, as I'm using vi.
>>>
>>> you *definetely* has the last line ended with '\n'.
>>
>> I dont see how, I copy and pasted from the string definition in D, directly after the first " and directly before the last ".
>>
>> If I look at the file in vim with line numbers turned on, the file is like this. So I really dont think I have a new line in the file...
>>
>> 1 Name = Int
>> 2 Other=Float
>> 3 One More = String(Random;)
>
> You can make sure using `hexdump -C file`. I tested locally creating a file using vi, and it does indeed have a '\n' at the end of file.
Ah, I see. That's a little annoying.
Thanks folks!
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December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin | On Thursday, 18 December 2014 at 09:18:36 UTC, Colin wrote: > I don't think it's my editor adding chars to the end of the file, as I'm using vi. :-) vim actually does it by default. Check out ":help eol" from inside it. I think other vi clones do it too but I'm not sure, but I know vim has it as documented behavior. There's apparently a few reasons for it: http://stackoverflow.com/questions/729692/why-should-files-end-with-a-newline |
December 18, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin | On 12/18/2014 02:51 AM, Colin wrote: > > vi, and it does indeed have a '\n' at the end of file. > > Ah, I see. That's a little annoying. It looks like there are ways of dealing with it: http://stackoverflow.com/questions/1050640/vim-disable-automatic-newline-at-end-of-file Ali "happy with Emacs :p" |
December 19, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Ali Çehreli | On Thursday, 18 December 2014 at 22:29:30 UTC, Ali Çehreli wrote:
> On 12/18/2014 02:51 AM, Colin wrote:
>
> > > vi, and it does indeed have a '\n' at the end of file.
> >
> > Ah, I see. That's a little annoying.
>
> It looks like there are ways of dealing with it:
>
>
> http://stackoverflow.com/questions/1050640/vim-disable-automatic-newline-at-end-of-file
>
> Ali
> "happy with Emacs :p"
Does emacs do this aswell? :)
Anyway, I'm making a tool which will be in use by a range of
people, so making the tool accept inputs with \n or not would be
the better choice than getting everyone to ensure they dont have
\n at the end of every file.
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December 19, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin Attachments: | On Fri, 19 Dec 2014 10:22:01 +0000 Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote: > On Thursday, 18 December 2014 at 22:29:30 UTC, Ali Çehreli wrote: > > On 12/18/2014 02:51 AM, Colin wrote: > > > > > > vi, and it does indeed have a '\n' at the end of file. > > > > > > Ah, I see. That's a little annoying. > > > > It looks like there are ways of dealing with it: > > > > > > http://stackoverflow.com/questions/1050640/vim-disable-automatic-newline-at-end-of-file > > > > Ali > > "happy with Emacs :p" > > Does emacs do this aswell? :) > > Anyway, I'm making a tool which will be in use by a range of people, so making the tool accept inputs with \n or not would be the better choice than getting everyone to ensure they dont have \n at the end of every file. `.strip` the read string. or just `.stripRight`. this will remove all unnecessary whitespace noise at both sides of string (`.strip`) or only at the end of the string (`.stripRight`). |
December 19, 2014 Re: std.file.readText() extra Line Feed character | ||||
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Posted in reply to Colin Attachments: | On Fri, 19 Dec 2014 10:22:01 +0000 Colin via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote: > On Thursday, 18 December 2014 at 22:29:30 UTC, Ali Çehreli wrote: > > On 12/18/2014 02:51 AM, Colin wrote: > > > > > > vi, and it does indeed have a '\n' at the end of file. > > > > > > Ah, I see. That's a little annoying. > > > > It looks like there are ways of dealing with it: > > > > > > http://stackoverflow.com/questions/1050640/vim-disable-automatic-newline-at-end-of-file > > > > Ali > > "happy with Emacs :p" > > Does emacs do this aswell? :) > > Anyway, I'm making a tool which will be in use by a range of people, so making the tool accept inputs with \n or not would be the better choice than getting everyone to ensure they dont have \n at the end of every file. p.s. in D string slicing cost almost nothing and it doesn't need to scan the whole string to find it's length, so stripping is very cheap. |
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