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Stacks based on lists work better and read more clearly when they

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grow and shrink on the right.
This commit is contained in:
Raymond Hettinger 2004-05-04 08:21:52 +00:00
parent 2d5914b17e
commit 0b569bb399
1 changed files with 7 additions and 8 deletions
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15
Lib/multifile.py
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@ -38,13 +38,13 @@ class MultiFile:
def __init__(self, fp, seekable=1):
self.fp = fp
self.stack = [] # Grows down
self.stack = []
self.level = 0
self.last = 0
if seekable:
self.seekable = 1
self.start = self.fp.tell()
self.posstack = [] # Grows down
self.posstack = []
def tell(self):
if self.level > 0:
@ -88,8 +88,7 @@ def readline(self):
marker = line.rstrip()
# No? OK, try to match a boundary.
# Return the line (unstripped) if we don't.
for i in range(len(self.stack)):
sep = self.stack[i]
for i, sep in enumerate(reversed(self.stack)):
if marker == self.section_divider(sep):
self.last = 0
break
@ -130,9 +129,9 @@ def next(self):
def push(self, sep):
if self.level > 0:
raise Error, 'bad MultiFile.push() call'
self.stack.insert(0, sep)
self.stack.append(sep)
if self.seekable:
self.posstack.insert(0, self.start)
self.posstack.append(self.start)
self.start = self.fp.tell()
def pop(self):
@ -143,9 +142,9 @@ def pop(self):
else:
abslastpos = self.lastpos + self.start
self.level = max(0, self.level - 1)
del self.stack[0]
self.stack.pop()
if self.seekable:
self.start = self.posstack.pop(0)
self.start = self.posstack.pop()
if self.level > 0:
self.lastpos = abslastpos - self.start