[ragel-users] Re: Primitive lookahead question

Wincent Colaiuta w... at wincent.com
Thu Sep 20 19:57:28 UTC 2007

El 20/9/2007, a las 21:30, Adrian Thurston escribió:

> Hi Wincent,
> I would suggesting using your first solution, then manually shorten  
> the
> from_file by 2 characters. It's a simple solution which avoids more
> elaborate backtracking/scanning approaches.
> What does git produce if the from file contains " b/"?

Ah, excellent question... let's see...	

$ mkdir test
$ cd test
$ git init
Initialized empty Git repository in .git/
$ mkdir "a b"
$ echo "content" > "a b/file"
$ git add "a b/file"
$ git commit -m "Initial content"
Created initial commit def76f9: Initial content
  1 files changed, 1 insertions(+), 0 deletions(-)
  create mode 100644 a b/file
$ echo "more content" >> "a b/file"
$ git diff
diff --git a/a b/file b/a b/file
index d95f3ad..86436d0 100644
--- a/a b/file
+++ b/a b/file
@@ -1 +1,2 @@
+more content

Geez... couldn't be worse, could it? I can barely parse it myself and  
I'm not even an automata. Hehe.

I think that really makes this question about lookahead to be moot:  
the simplest thing to do will be to just ignore everything from "diff  
--git" up to the next newline, because the path information is  
redundantly available further down anyway (in the lines starting with  
"---" and "+++") where it is much less difficult to extract.

Thanks a lot for the help, Adrian. Your question has short-circuited  
a painful side trip.


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