mirror of https://github.com/python/cpython
Rewrite parsesequence() to emulate MH without invoking pick.
Test it extensively by using pick.
This commit is contained in:
Guido van Rossum
parent
5e92affc54
commit
7cfd31ee8a
170
Lib/mhlib.py
170
Lib/mhlib.py
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@ -78,6 +78,7 @@ import string
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import mimetools
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import multifile
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import shutil
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from bisect import bisect
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# Exported constants
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@ -332,49 +333,131 @@ class Folder:
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# Return the current message. Raise KeyError when there is none
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def getcurrent(self):
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return min(self.getsequences()['cur'])
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seqs = self.getsequences()
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try:
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return max(seqs['cur'])
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except (ValueError, KeyError):
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raise Error, "no cur message"
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# Set the current message
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def setcurrent(self, n):
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updateline(self.getsequencesfilename(), 'cur', str(n), 0)
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# Parse an MH sequence specification into a message list.
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# Attempt to mimic mh-sequence(5) as close as possible.
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# Also attempt to mimic observed behavior regarding which
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# conditions cause which error messages
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def parsesequence(self, seq):
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if seq == "all":
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return self.listmessages()
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try:
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n = string.atoi(seq, 10)
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except string.atoi_error:
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n = 0
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if n > 0:
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return [n]
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if regex.match("^last:", seq) >= 0:
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# XXX Still not complete (see mh-format(5)).
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# Missing are:
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# - 'prev', 'next' as count
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# - Sequence-Negation option
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all = self.listmessages()
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# Observed behavior: test for empty folder is done first
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if not all:
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raise Error, "no messages in %s" % self.name
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# Common case first: all is frequently the default
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if seq == 'all':
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return all
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# Test for X:Y before X-Y because 'seq:-n' matches both
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i = string.find(seq, ':')
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if i >= 0:
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head, dir, tail = seq[:i], '', seq[i+1:]
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if tail[:1] in '-+':
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dir, tail = tail[:1], tail[1:]
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if not isnumeric(tail):
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raise Error, "bad message list %s" % seq
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try:
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count = string.atoi(tail)
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except (ValueError, OverflowError):
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# Can't use sys.maxint because of i+count below
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count = len(all)
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try:
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anchor = self._parseindex(head, all)
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except Error, msg:
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seqs = self.getsequences()
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if not seqs.has_key(head):
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if not msg:
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msg = "bad message list %s" % seq
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raise Error, msg, sys.exc_traceback
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msgs = seqs[head]
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if not msgs:
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raise Error, "sequence %s empty" % head
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if dir == '-':
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return msgs[-count:]
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else:
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return msgs[:count]
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else:
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if not dir:
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if head in ('prev', 'last'):
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dir = '-'
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if dir == '-':
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i = bisect(all, anchor)
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return all[max(0, i-count):i]
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else:
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i = bisect(all, anchor-1)
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return all[i:i+count]
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# Test for X-Y next
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i = string.find(seq, '-')
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if i >= 0:
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begin = self._parseindex(seq[:i], all)
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end = self._parseindex(seq[i+1:], all)
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i = bisect(all, begin-1)
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j = bisect(all, end)
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r = all[i:j]
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if not r:
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raise Error, "bad message list %s" % seq
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return r
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# Neither X:Y nor X-Y; must be a number or a (pseudo-)sequence
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try:
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n = string.atoi(seq[5:])
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except string.atoi_error:
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n = 0
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if n > 0:
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return self.listmessages()[-n:]
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if regex.match("^first:", seq) >= 0:
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try:
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n = string.atoi(seq[6:])
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except string.atoi_error:
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n = 0
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if n > 0:
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return self.listmessages()[:n]
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dict = self.getsequences()
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if dict.has_key(seq):
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return dict[seq]
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context = self.mh.getcontext()
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# Complex syntax -- use pick
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pipe = os.popen("pick +%s %s 2>/dev/null" % (self.name, seq))
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data = pipe.read()
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sts = pipe.close()
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self.mh.setcontext(context)
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if sts:
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raise Error, "unparseable sequence %s" % `seq`
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items = string.split(data)
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return map(string.atoi, items)
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n = self._parseindex(seq, all)
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except Error, msg:
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seqs = self.getsequences()
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if not seqs.has_key(seq):
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if not msg:
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msg = "bad message list %s" % seq
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raise Error, msg
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return seqs[seq]
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else:
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if n not in all:
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if isnumeric(seq):
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raise Error, \
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"message %d doesn't exist" % n
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else:
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raise Error, "no %s message" % seq
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else:
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return [n]
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# Internal: parse a message number (or cur, first, etc.)
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def _parseindex(self, seq, all):
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if isnumeric(seq):
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try:
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return string.atoi(seq)
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except (OverflowError, ValueError):
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return sys.maxint
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if seq in ('cur', '.'):
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return self.getcurrent()
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if seq == 'first':
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return all[0]
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if seq == 'last':
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return all[-1]
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if seq == 'next':
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n = self.getcurrent()
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i = bisect(all, n)
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try:
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return all[i]
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except IndexError:
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raise Error, "no next message"
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if seq == 'prev':
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n = self.getcurrent()
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i = bisect(all, n-1)
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if i == 0:
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raise Error, "no prev message"
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try:
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return all[i-1]
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except IndexError:
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raise Error, "no prev message"
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raise Error, None
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# Open a message -- returns a Message object
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def openmessage(self, n):
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@ -704,8 +787,7 @@ class IntSet:
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alo, ahi = self.pairs[i-1]
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blo, bhi = self.pairs[i]
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if ahi >= blo-1:
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self.pairs[i-1:i+1] = [
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(alo, max(ahi, bhi))]
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self.pairs[i-1:i+1] = [(alo, max(ahi, bhi))]
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else:
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i = i+1
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@ -883,8 +965,20 @@ def test():
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do('mh.getcontext()')
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context = mh.getcontext()
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f = mh.openfolder(context)
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do('f.listmessages()')
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do('f.getcurrent()')
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for seq in ['first', 'last', 'cur', '.', 'prev', 'next',
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'first:3', 'last:3', 'cur:3', 'cur:-3',
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'prev:3', 'next:3',
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'1:3', '1:-3', '100:3', '100:-3', '10000:3', '10000:-3',
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'all']:
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try:
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do('f.parsesequence(%s)' % `seq`)
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except Error, msg:
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print "Error:", msg
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stuff = os.popen("pick %s 2>/dev/null" % `seq`).read()
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list = map(string.atoi, string.split(stuff))
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print list, "<-- pick"
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do('f.listmessages()')
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if __name__ == '__main__':
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