mirror of
https://github.com/python/cpython.git
synced 2024-12-14 20:34:12 +08:00
543 lines
17 KiB
Python
Executable File
543 lines
17 KiB
Python
Executable File
#! /usr/bin/env python
|
|
|
|
# This file contains a class and a main program that perform three
|
|
# related (though complimentary) formatting operations on Python
|
|
# programs. When called as "pindent -c", it takes a valid Python
|
|
# program as input and outputs a version augmented with block-closing
|
|
# comments. When called as "pindent -d", it assumes its input is a
|
|
# Python program with block-closing comments and outputs a commentless
|
|
# version. When called as "pindent -r" it assumes its input is a
|
|
# Python program with block-closing comments but with its indentation
|
|
# messed up, and outputs a properly indented version.
|
|
|
|
# A "block-closing comment" is a comment of the form '# end <keyword>'
|
|
# where <keyword> is the keyword that opened the block. If the
|
|
# opening keyword is 'def' or 'class', the function or class name may
|
|
# be repeated in the block-closing comment as well. Here is an
|
|
# example of a program fully augmented with block-closing comments:
|
|
|
|
# def foobar(a, b):
|
|
# if a == b:
|
|
# a = a+1
|
|
# elif a < b:
|
|
# b = b-1
|
|
# if b > a: a = a-1
|
|
# # end if
|
|
# else:
|
|
# print 'oops!'
|
|
# # end if
|
|
# # end def foobar
|
|
|
|
# Note that only the last part of an if...elif...else... block needs a
|
|
# block-closing comment; the same is true for other compound
|
|
# statements (e.g. try...except). Also note that "short-form" blocks
|
|
# like the second 'if' in the example must be closed as well;
|
|
# otherwise the 'else' in the example would be ambiguous (remember
|
|
# that indentation is not significant when interpreting block-closing
|
|
# comments).
|
|
|
|
# The operations are idempotent (i.e. applied to their own output
|
|
# they yield an identical result). Running first "pindent -c" and
|
|
# then "pindent -r" on a valid Python program produces a program that
|
|
# is semantically identical to the input (though its indentation may
|
|
# be different). Running "pindent -e" on that output produces a
|
|
# program that only differs from the original in indentation.
|
|
|
|
# Other options:
|
|
# -s stepsize: set the indentation step size (default 8)
|
|
# -t tabsize : set the number of spaces a tab character is worth (default 8)
|
|
# -e : expand TABs into spaces
|
|
# file ... : input file(s) (default standard input)
|
|
# The results always go to standard output
|
|
|
|
# Caveats:
|
|
# - comments ending in a backslash will be mistaken for continued lines
|
|
# - continuations using backslash are always left unchanged
|
|
# - continuations inside parentheses are not extra indented by -r
|
|
# but must be indented for -c to work correctly (this breaks
|
|
# idempotency!)
|
|
# - continued lines inside triple-quoted strings are totally garbled
|
|
|
|
# Secret feature:
|
|
# - On input, a block may also be closed with an "end statement" --
|
|
# this is a block-closing comment without the '#' sign.
|
|
|
|
# Possible improvements:
|
|
# - check syntax based on transitions in 'next' table
|
|
# - better error reporting
|
|
# - better error recovery
|
|
# - check identifier after class/def
|
|
|
|
# The following wishes need a more complete tokenization of the source:
|
|
# - Don't get fooled by comments ending in backslash
|
|
# - reindent continuation lines indicated by backslash
|
|
# - handle continuation lines inside parentheses/braces/brackets
|
|
# - handle triple quoted strings spanning lines
|
|
# - realign comments
|
|
# - optionally do much more thorough reformatting, a la C indent
|
|
|
|
# Defaults
|
|
STEPSIZE = 8
|
|
TABSIZE = 8
|
|
EXPANDTABS = 0
|
|
|
|
import re
|
|
import sys
|
|
|
|
next = {}
|
|
next['if'] = next['elif'] = 'elif', 'else', 'end'
|
|
next['while'] = next['for'] = 'else', 'end'
|
|
next['try'] = 'except', 'finally'
|
|
next['except'] = 'except', 'else', 'end'
|
|
next['else'] = next['finally'] = next['def'] = next['class'] = 'end'
|
|
next['end'] = ()
|
|
start = 'if', 'while', 'for', 'try', 'def', 'class'
|
|
|
|
class PythonIndenter:
|
|
|
|
def __init__(self, fpi = sys.stdin, fpo = sys.stdout,
|
|
indentsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
self.fpi = fpi
|
|
self.fpo = fpo
|
|
self.indentsize = indentsize
|
|
self.tabsize = tabsize
|
|
self.lineno = 0
|
|
self.expandtabs = expandtabs
|
|
self._write = fpo.write
|
|
self.kwprog = re.compile(
|
|
r'^\s*(?P<kw>[a-z]+)'
|
|
r'(\s+(?P<id>[a-zA-Z_]\w*))?'
|
|
r'[^\w]')
|
|
self.endprog = re.compile(
|
|
r'^\s*#?\s*end\s+(?P<kw>[a-z]+)'
|
|
r'(\s+(?P<id>[a-zA-Z_]\w*))?'
|
|
r'[^\w]')
|
|
self.wsprog = re.compile(r'^[ \t]*')
|
|
# end def __init__
|
|
|
|
def write(self, line):
|
|
if self.expandtabs:
|
|
self._write(line.expandtabs(self.tabsize))
|
|
else:
|
|
self._write(line)
|
|
# end if
|
|
# end def write
|
|
|
|
def readline(self):
|
|
line = self.fpi.readline()
|
|
if line: self.lineno = self.lineno + 1
|
|
# end if
|
|
return line
|
|
# end def readline
|
|
|
|
def error(self, fmt, *args):
|
|
if args: fmt = fmt % args
|
|
# end if
|
|
sys.stderr.write('Error at line %d: %s\n' % (self.lineno, fmt))
|
|
self.write('### %s ###\n' % fmt)
|
|
# end def error
|
|
|
|
def getline(self):
|
|
line = self.readline()
|
|
while line[-2:] == '\\\n':
|
|
line2 = self.readline()
|
|
if not line2: break
|
|
# end if
|
|
line = line + line2
|
|
# end while
|
|
return line
|
|
# end def getline
|
|
|
|
def putline(self, line, indent = None):
|
|
if indent is None:
|
|
self.write(line)
|
|
return
|
|
# end if
|
|
tabs, spaces = divmod(indent*self.indentsize, self.tabsize)
|
|
i = 0
|
|
m = self.wsprog.match(line)
|
|
if m: i = m.end()
|
|
# end if
|
|
self.write('\t'*tabs + ' '*spaces + line[i:])
|
|
# end def putline
|
|
|
|
def reformat(self):
|
|
stack = []
|
|
while 1:
|
|
line = self.getline()
|
|
if not line: break # EOF
|
|
# end if
|
|
m = self.endprog.match(line)
|
|
if m:
|
|
kw = 'end'
|
|
kw2 = m.group('kw')
|
|
if not stack:
|
|
self.error('unexpected end')
|
|
elif stack[-1][0] != kw2:
|
|
self.error('unmatched end')
|
|
# end if
|
|
del stack[-1:]
|
|
self.putline(line, len(stack))
|
|
continue
|
|
# end if
|
|
m = self.kwprog.match(line)
|
|
if m:
|
|
kw = m.group('kw')
|
|
if kw in start:
|
|
self.putline(line, len(stack))
|
|
stack.append((kw, kw))
|
|
continue
|
|
# end if
|
|
if kw in next and stack:
|
|
self.putline(line, len(stack)-1)
|
|
kwa, kwb = stack[-1]
|
|
stack[-1] = kwa, kw
|
|
continue
|
|
# end if
|
|
# end if
|
|
self.putline(line, len(stack))
|
|
# end while
|
|
if stack:
|
|
self.error('unterminated keywords')
|
|
for kwa, kwb in stack:
|
|
self.write('\t%s\n' % kwa)
|
|
# end for
|
|
# end if
|
|
# end def reformat
|
|
|
|
def delete(self):
|
|
begin_counter = 0
|
|
end_counter = 0
|
|
while 1:
|
|
line = self.getline()
|
|
if not line: break # EOF
|
|
# end if
|
|
m = self.endprog.match(line)
|
|
if m:
|
|
end_counter = end_counter + 1
|
|
continue
|
|
# end if
|
|
m = self.kwprog.match(line)
|
|
if m:
|
|
kw = m.group('kw')
|
|
if kw in start:
|
|
begin_counter = begin_counter + 1
|
|
# end if
|
|
# end if
|
|
self.putline(line)
|
|
# end while
|
|
if begin_counter - end_counter < 0:
|
|
sys.stderr.write('Warning: input contained more end tags than expected\n')
|
|
elif begin_counter - end_counter > 0:
|
|
sys.stderr.write('Warning: input contained less end tags than expected\n')
|
|
# end if
|
|
# end def delete
|
|
|
|
def complete(self):
|
|
self.indentsize = 1
|
|
stack = []
|
|
todo = []
|
|
thisid = ''
|
|
current, firstkw, lastkw, topid = 0, '', '', ''
|
|
while 1:
|
|
line = self.getline()
|
|
i = 0
|
|
m = self.wsprog.match(line)
|
|
if m: i = m.end()
|
|
# end if
|
|
m = self.endprog.match(line)
|
|
if m:
|
|
thiskw = 'end'
|
|
endkw = m.group('kw')
|
|
thisid = m.group('id')
|
|
else:
|
|
m = self.kwprog.match(line)
|
|
if m:
|
|
thiskw = m.group('kw')
|
|
if thiskw not in next:
|
|
thiskw = ''
|
|
# end if
|
|
if thiskw in ('def', 'class'):
|
|
thisid = m.group('id')
|
|
else:
|
|
thisid = ''
|
|
# end if
|
|
elif line[i:i+1] in ('\n', '#'):
|
|
todo.append(line)
|
|
continue
|
|
else:
|
|
thiskw = ''
|
|
# end if
|
|
# end if
|
|
indent = len(line[:i].expandtabs(self.tabsize))
|
|
while indent < current:
|
|
if firstkw:
|
|
if topid:
|
|
s = '# end %s %s\n' % (
|
|
firstkw, topid)
|
|
else:
|
|
s = '# end %s\n' % firstkw
|
|
# end if
|
|
self.putline(s, current)
|
|
firstkw = lastkw = ''
|
|
# end if
|
|
current, firstkw, lastkw, topid = stack[-1]
|
|
del stack[-1]
|
|
# end while
|
|
if indent == current and firstkw:
|
|
if thiskw == 'end':
|
|
if endkw != firstkw:
|
|
self.error('mismatched end')
|
|
# end if
|
|
firstkw = lastkw = ''
|
|
elif not thiskw or thiskw in start:
|
|
if topid:
|
|
s = '# end %s %s\n' % (
|
|
firstkw, topid)
|
|
else:
|
|
s = '# end %s\n' % firstkw
|
|
# end if
|
|
self.putline(s, current)
|
|
firstkw = lastkw = topid = ''
|
|
# end if
|
|
# end if
|
|
if indent > current:
|
|
stack.append((current, firstkw, lastkw, topid))
|
|
if thiskw and thiskw not in start:
|
|
# error
|
|
thiskw = ''
|
|
# end if
|
|
current, firstkw, lastkw, topid = \
|
|
indent, thiskw, thiskw, thisid
|
|
# end if
|
|
if thiskw:
|
|
if thiskw in start:
|
|
firstkw = lastkw = thiskw
|
|
topid = thisid
|
|
else:
|
|
lastkw = thiskw
|
|
# end if
|
|
# end if
|
|
for l in todo: self.write(l)
|
|
# end for
|
|
todo = []
|
|
if not line: break
|
|
# end if
|
|
self.write(line)
|
|
# end while
|
|
# end def complete
|
|
|
|
# end class PythonIndenter
|
|
|
|
# Simplified user interface
|
|
# - xxx_filter(input, output): read and write file objects
|
|
# - xxx_string(s): take and return string object
|
|
# - xxx_file(filename): process file in place, return true iff changed
|
|
|
|
def complete_filter(input = sys.stdin, output = sys.stdout,
|
|
stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.complete()
|
|
# end def complete_filter
|
|
|
|
def delete_filter(input= sys.stdin, output = sys.stdout,
|
|
stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.delete()
|
|
# end def delete_filter
|
|
|
|
def reformat_filter(input = sys.stdin, output = sys.stdout,
|
|
stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.reformat()
|
|
# end def reformat_filter
|
|
|
|
class StringReader:
|
|
def __init__(self, buf):
|
|
self.buf = buf
|
|
self.pos = 0
|
|
self.len = len(self.buf)
|
|
# end def __init__
|
|
def read(self, n = 0):
|
|
if n <= 0:
|
|
n = self.len - self.pos
|
|
else:
|
|
n = min(n, self.len - self.pos)
|
|
# end if
|
|
r = self.buf[self.pos : self.pos + n]
|
|
self.pos = self.pos + n
|
|
return r
|
|
# end def read
|
|
def readline(self):
|
|
i = self.buf.find('\n', self.pos)
|
|
return self.read(i + 1 - self.pos)
|
|
# end def readline
|
|
def readlines(self):
|
|
lines = []
|
|
line = self.readline()
|
|
while line:
|
|
lines.append(line)
|
|
line = self.readline()
|
|
# end while
|
|
return lines
|
|
# end def readlines
|
|
# seek/tell etc. are left as an exercise for the reader
|
|
# end class StringReader
|
|
|
|
class StringWriter:
|
|
def __init__(self):
|
|
self.buf = ''
|
|
# end def __init__
|
|
def write(self, s):
|
|
self.buf = self.buf + s
|
|
# end def write
|
|
def getvalue(self):
|
|
return self.buf
|
|
# end def getvalue
|
|
# end class StringWriter
|
|
|
|
def complete_string(source, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
input = StringReader(source)
|
|
output = StringWriter()
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.complete()
|
|
return output.getvalue()
|
|
# end def complete_string
|
|
|
|
def delete_string(source, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
input = StringReader(source)
|
|
output = StringWriter()
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.delete()
|
|
return output.getvalue()
|
|
# end def delete_string
|
|
|
|
def reformat_string(source, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
input = StringReader(source)
|
|
output = StringWriter()
|
|
pi = PythonIndenter(input, output, stepsize, tabsize, expandtabs)
|
|
pi.reformat()
|
|
return output.getvalue()
|
|
# end def reformat_string
|
|
|
|
def complete_file(filename, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
source = open(filename, 'r').read()
|
|
result = complete_string(source, stepsize, tabsize, expandtabs)
|
|
if source == result: return 0
|
|
# end if
|
|
import os
|
|
try: os.rename(filename, filename + '~')
|
|
except os.error: pass
|
|
# end try
|
|
f = open(filename, 'w')
|
|
f.write(result)
|
|
f.close()
|
|
return 1
|
|
# end def complete_file
|
|
|
|
def delete_file(filename, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
source = open(filename, 'r').read()
|
|
result = delete_string(source, stepsize, tabsize, expandtabs)
|
|
if source == result: return 0
|
|
# end if
|
|
import os
|
|
try: os.rename(filename, filename + '~')
|
|
except os.error: pass
|
|
# end try
|
|
f = open(filename, 'w')
|
|
f.write(result)
|
|
f.close()
|
|
return 1
|
|
# end def delete_file
|
|
|
|
def reformat_file(filename, stepsize = STEPSIZE, tabsize = TABSIZE, expandtabs = EXPANDTABS):
|
|
source = open(filename, 'r').read()
|
|
result = reformat_string(source, stepsize, tabsize, expandtabs)
|
|
if source == result: return 0
|
|
# end if
|
|
import os
|
|
try: os.rename(filename, filename + '~')
|
|
except os.error: pass
|
|
# end try
|
|
f = open(filename, 'w')
|
|
f.write(result)
|
|
f.close()
|
|
return 1
|
|
# end def reformat_file
|
|
|
|
# Test program when called as a script
|
|
|
|
usage = """
|
|
usage: pindent (-c|-d|-r) [-s stepsize] [-t tabsize] [-e] [file] ...
|
|
-c : complete a correctly indented program (add #end directives)
|
|
-d : delete #end directives
|
|
-r : reformat a completed program (use #end directives)
|
|
-s stepsize: indentation step (default %(STEPSIZE)d)
|
|
-t tabsize : the worth in spaces of a tab (default %(TABSIZE)d)
|
|
-e : expand TABs into spaces (defailt OFF)
|
|
[file] ... : files are changed in place, with backups in file~
|
|
If no files are specified or a single - is given,
|
|
the program acts as a filter (reads stdin, writes stdout).
|
|
""" % vars()
|
|
|
|
def error_both(op1, op2):
|
|
sys.stderr.write('Error: You can not specify both '+op1+' and -'+op2[0]+' at the same time\n')
|
|
sys.stderr.write(usage)
|
|
sys.exit(2)
|
|
# end def error_both
|
|
|
|
def test():
|
|
import getopt
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], 'cdrs:t:e')
|
|
except getopt.error as msg:
|
|
sys.stderr.write('Error: %s\n' % msg)
|
|
sys.stderr.write(usage)
|
|
sys.exit(2)
|
|
# end try
|
|
action = None
|
|
stepsize = STEPSIZE
|
|
tabsize = TABSIZE
|
|
expandtabs = EXPANDTABS
|
|
for o, a in opts:
|
|
if o == '-c':
|
|
if action: error_both(o, action)
|
|
# end if
|
|
action = 'complete'
|
|
elif o == '-d':
|
|
if action: error_both(o, action)
|
|
# end if
|
|
action = 'delete'
|
|
elif o == '-r':
|
|
if action: error_both(o, action)
|
|
# end if
|
|
action = 'reformat'
|
|
elif o == '-s':
|
|
stepsize = int(a)
|
|
elif o == '-t':
|
|
tabsize = int(a)
|
|
elif o == '-e':
|
|
expandtabs = 1
|
|
# end if
|
|
# end for
|
|
if not action:
|
|
sys.stderr.write(
|
|
'You must specify -c(omplete), -d(elete) or -r(eformat)\n')
|
|
sys.stderr.write(usage)
|
|
sys.exit(2)
|
|
# end if
|
|
if not args or args == ['-']:
|
|
action = eval(action + '_filter')
|
|
action(sys.stdin, sys.stdout, stepsize, tabsize, expandtabs)
|
|
else:
|
|
action = eval(action + '_file')
|
|
for filename in args:
|
|
action(filename, stepsize, tabsize, expandtabs)
|
|
# end for
|
|
# end if
|
|
# end def test
|
|
|
|
if __name__ == '__main__':
|
|
test()
|
|
# end if
|