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authorJeremy Kerr <jk@ozlabs.org>2008-09-09 16:00:58 +1000
committerJeremy Kerr <jk@ozlabs.org>2008-09-09 16:00:58 +1000
commit4ede11b48f3b056d655a2e4a74d3627292bfbb9f (patch)
tree8c562a6e40b1b247820b1b1263a5d901b373e334 /apps/patchwork/parser.py
parent3be1754575b6735718a76238f437eaa2c2d3c4b1 (diff)
downloadpatchwork-4ede11b48f3b056d655a2e4a74d3627292bfbb9f.tar.bz2
patchwork-4ede11b48f3b056d655a2e4a74d3627292bfbb9f.tar.xz
Move patchparser to patchwork.parser
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Diffstat (limited to 'apps/patchwork/parser.py')
-rw-r--r--apps/patchwork/parser.py158
1 files changed, 158 insertions, 0 deletions
diff --git a/apps/patchwork/parser.py b/apps/patchwork/parser.py
new file mode 100644
index 0000000..16d1de4
--- /dev/null
+++ b/apps/patchwork/parser.py
@@ -0,0 +1,158 @@
+#!/usr/bin/python
+#
+# Patchwork - automated patch tracking system
+# Copyright (C) 2008 Jeremy Kerr <jk@ozlabs.org>
+#
+# This file is part of the Patchwork package.
+#
+# Patchwork is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# Patchwork is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Patchwork; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+
+import re
+
+def parse_patch(text):
+ patchbuf = ''
+ commentbuf = ''
+ buf = ''
+
+ # state specified the line we just saw, and what to expect next
+ state = 0
+ # 0: text
+ # 1: suspected patch header (diff, ====, Index:)
+ # 2: patch header line 1 (---)
+ # 3: patch header line 2 (+++)
+ # 4: patch hunk header line (@@ line)
+ # 5: patch hunk content
+ #
+ # valid transitions:
+ # 0 -> 1 (diff, ===, Index:)
+ # 0 -> 2 (---)
+ # 1 -> 2 (---)
+ # 2 -> 3 (+++)
+ # 3 -> 4 (@@ line)
+ # 4 -> 5 (patch content)
+ # 5 -> 1 (run out of lines from @@-specifed count)
+ #
+ # Suspected patch header is stored into buf, and appended to
+ # patchbuf if we find a following hunk. Otherwise, append to
+ # comment after parsing.
+
+ # line counts while parsing a patch hunk
+ lc = (0, 0)
+ hunk = 0
+
+ hunk_re = re.compile('^\@\@ -\d+(?:,(\d+))? \+\d+(?:,(\d+))? \@\@')
+
+ for line in text.split('\n'):
+ line += '\n'
+
+ if state == 0:
+ if line.startswith('diff') or line.startswith('===') \
+ or line.startswith('Index: '):
+ state = 1
+ buf += line
+
+ elif line.startswith('--- '):
+ state = 2
+ buf += line
+
+ else:
+ commentbuf += line
+
+ elif state == 1:
+ buf += line
+ if line.startswith('--- '):
+ state = 2
+
+ elif state == 2:
+ if line.startswith('+++ '):
+ state = 3
+ buf += line
+
+ elif hunk:
+ state = 1
+ buf += line
+
+ else:
+ state = 0
+ commentbuf += buf + line
+ buf = ''
+
+ elif state == 3:
+ match = hunk_re.match(line)
+ if match:
+
+ def fn(x):
+ if not x:
+ return 1
+ return int(x)
+
+ lc = map(fn, match.groups())
+
+ state = 4
+ patchbuf += buf + line
+ buf = ''
+
+ elif line.startswith('--- '):
+ patchbuf += buf + line
+ buf = ''
+ state = 2
+
+ elif hunk:
+ state = 1
+ buf += line
+
+ else:
+ state = 0
+ commentbuf += buf + line
+ buf = ''
+
+ elif state == 4 or state == 5:
+ if line.startswith('-'):
+ lc[0] -= 1
+ elif line.startswith('+'):
+ lc[1] -= 1
+ else:
+ lc[0] -= 1
+ lc[1] -= 1
+
+ patchbuf += line
+
+ if lc[0] <= 0 and lc[1] <= 0:
+ state = 3
+ hunk += 1
+ else:
+ state = 5
+
+ else:
+ raise Exception("Unknown state %d! (line '%s')" % (state, line))
+
+ commentbuf += buf
+
+ if patchbuf == '':
+ patchbuf = None
+
+ if commentbuf == '':
+ commentbuf = None
+
+ return (patchbuf, commentbuf)
+
+if __name__ == '__main__':
+ import sys
+ (patch, comment) = parse_patch(sys.stdin.read())
+ if patch:
+ print "Patch: ------\n" + patch
+ if comment:
+ print "Comment: ----\n" + comment