From a0e0b03bbb1af2496841ffe824b36c5c59fed759 Mon Sep 17 00:00:00 2001
From: pin <pin@fe552daf-6dbe-4428-90eb-1537e0879342>
Date: Wed, 7 Jul 2010 12:24:05 +0000
Subject: [PATCH] =?utf8?q?Ajout=20utilitaire=20pour=20lire=20les=20fichier?=
=?utf8?q?s=20ligne=20par=20ligne=20=C3=A0=20l'envers.?=
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git-svn-id: https://svn.cri.ensmp.fr/svn/minwii/trunk@276 fe552daf-6dbe-4428-90eb-1537e0879342
---
src/minwii/backwardsfilereader.py | 47 +++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100755 src/minwii/backwardsfilereader.py
diff --git a/src/minwii/backwardsfilereader.py b/src/minwii/backwardsfilereader.py
new file mode 100755
index 0000000..ff89f07
--- /dev/null
+++ b/src/minwii/backwardsfilereader.py
@@ -0,0 +1,47 @@
+## {{{ http://code.activestate.com/recipes/439045/ (r2)
+#!/usr/bin/env python
+# -*-mode: python; coding: iso-8859-1 -*-
+#
+# Copyright (c) Peter Astrand <astrand@cendio.se>
+# $Id$
+# $URL$
+
+import string
+
+class BackwardsReader:
+ """Read a file line by line, backwards"""
+
+ def readline(self):
+ while 1:
+ newline_pos = string.rfind(self.buf, "\n")
+ pos = self.file.tell()
+ if newline_pos != -1:
+ # Found a newline
+ line = self.buf[newline_pos+1:]
+ self.buf = self.buf[:newline_pos]
+ if pos != 0 or newline_pos != 0 or self.trailing_newline:
+ line += "\n"
+ return line
+ else:
+ if pos == 0:
+ # Start-of-file
+ return ""
+ else:
+ # Need to fill buffer
+ toread = min(self.BLKSIZE, pos)
+ self.file.seek(-toread, 1)
+ self.buf = self.file.read(toread) + self.buf
+ self.file.seek(-toread, 1)
+ if pos - toread == 0:
+ self.buf = "\n" + self.buf
+
+ def __init__(self, file, BLKSIZE=4096):
+ self.file = file
+ self.BLKSIZE = BLKSIZE
+ self.buf = ""
+ self.file.seek(-1, 2)
+ self.trailing_newline = 0
+ lastchar = self.file.read(1)
+ if lastchar == "\n":
+ self.trailing_newline = 1
+ self.file.seek(-1, 2)
--
2.20.1