Little challenge: Best way to read stream and count line returns
Hello everyone, I often needs to read some streams these days and to get some infos related to the lines returns for example. Because of the CRLF it is a little complicated sometimes. I have an example of code here: | lfShouldBeCounted char count remaining | lfShouldBeCounted := false. remaining := 0. count := 0. stream position: startPos. [ stream position = endPos ] whileFalse: [ "13 is a CR, 10 a LF" (char := stream next asInteger) = 13 ifTrue: [ count := count + 1. remaining := 0. lfShouldBeCounted := false ] ifFalse: [ char = 10 ifTrue: [ lfShouldBeCounted ifTrue: [ count := count + 1. remaining := 0 ] ifFalse: [ lfShouldBeCounted := true ] ] ifFalse: [ remaining := remaining + 1 ] ] ] With this example I know how many lines where passed between the startPos and the endPos in a stream. I also know how many char there is between the last line return and the endPos. I wanted to know if you had a better way to do that? The way need to be as performant than this snippet. I know some people here can produce a snippet more readable and easier to maintain :) -- Cyril Ferlicot https://ferlicot.fr http://www.synectique.eu 2 rue Jacques Prévert 01, 59650 Villeneuve d'ascq France
count := 0. stream do: [ :character | (character = Character cr and: [stream peek = Character lf]) ifTrue: [ count := count + 1 ]]. count. Snippet with example: | count crlftext stream | stream := (String streamContents: [ :s | s nextPutAll: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.'; crlf; nextPutAll: 'Phasellus sollicitudin lorem ac nunc varius aliquam.'; crlf; nextPutAll: 'Quisque posuere augue in quam suscipit eleifend.'; crlf; nextPutAll: 'Donec non tempor ex.'; crlf; nextPutAll: 'Phasellus placerat leo augue, eu placerat augue luctus quis. '; crlf; lf; cr; cr ]) readStream. count := 0. stream do: [ :char | (char = Character cr and: [ stream peek = Character lf ]) ifTrue: [ count := count + 1 ] ]. count On 13 July 2017 at 09:31, Cyril Ferlicot <cyril.ferlicot@gmail.com> wrote:
Hello everyone,
I often needs to read some streams these days and to get some infos related to the lines returns for example. Because of the CRLF it is a little complicated sometimes.
I have an example of code here:
| lfShouldBeCounted char count remaining | lfShouldBeCounted := false. remaining := 0. count := 0. stream position: startPos. [ stream position = endPos ] whileFalse: [ "13 is a CR, 10 a LF" (char := stream next asInteger) = 13 ifTrue: [ count := count + 1. remaining := 0. lfShouldBeCounted := false ] ifFalse: [ char = 10 ifTrue: [ lfShouldBeCounted ifTrue: [ count := count + 1. remaining := 0 ] ifFalse: [ lfShouldBeCounted := true ] ] ifFalse: [ remaining := remaining + 1 ] ] ]
With this example I know how many lines where passed between the startPos and the endPos in a stream. I also know how many char there is between the last line return and the endPos.
I wanted to know if you had a better way to do that? The way need to be as performant than this snippet. I know some people here can produce a snippet more readable and easier to maintain :)
-- Cyril Ferlicot https://ferlicot.fr
http://www.synectique.eu 2 rue Jacques Prévert 01, 59650 Villeneuve d'ascq France
participants (2)
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Cyril Ferlicot -
Julián Maestri