diff options
Diffstat (limited to 'Demo')
| -rwxr-xr-x | Demo/scripts/eqfix.py | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/Demo/scripts/eqfix.py b/Demo/scripts/eqfix.py new file mode 100755 index 0000000..c666ee0 --- /dev/null +++ b/Demo/scripts/eqfix.py @@ -0,0 +1,168 @@ +#! /ufs/guido/bin/sgi/python +#! /usr/local/python + +# Fix Python source files to use the new equality test operator, +# i.e., +# if x == y: ... +# instead of +# if x = y: ... +# +# Command line arguments are files or directories to be processed. +# Directories are searched recursively for files whose name looks +# like a python module. +# Symbolic links are always ignored (except as explicit directory +# arguments). Of course, the original file is kept as a back-up +# (with a "~" attached to its name). +# +# Changes made are reported to stdout in a diff-like format. +# +# Undoubtedly you can do this using find and sed or perl, but this is +# a nice example of Python code that recurses down a directory tree +# and uses regular expressions. Also note several subtleties like +# preserving the file's mode and avoiding to even write a temp file +# when no changes are needed for a file. +# +# NB: by changing only the function fixline() you can turn this +# into a program for a different change to Python programs... + +import sys +import regex +import posix +import path +from stat import * + +err = sys.stderr.write +dbg = err +rep = sys.stdout.write + +def main(): + bad = 0 + if not sys.argv[1:]: # No arguments + err('usage: ' + argv[0] + ' file-or-directory ...\n') + sys.exit(2) + for arg in sys.argv[1:]: + if path.isdir(arg): + if recursedown(arg): bad = 1 + elif path.islink(arg): + err(arg + ': will not process symbolic links\n') + bad = 1 + else: + if fix(arg): bad = 1 + sys.exit(bad) + +ispythonprog = regex.compile('^[a-zA-Z0-9_]+\.py$') +def ispython(name): + return ispythonprog.match(name) >= 0 + +def recursedown(dirname): + dbg('recursedown(' + `dirname` + ')\n') + bad = 0 + try: + names = posix.listdir(dirname) + except posix.error, msg: + err(dirname + ': cannot list directory: ' + `msg` + '\n') + return 1 + names.sort() + subdirs = [] + for name in names: + if name in ('.', '..'): continue + fullname = path.join(dirname, name) + if path.islink(fullname): pass + elif path.isdir(fullname): + subdirs.append(fullname) + elif ispython(name): + if fix(fullname): bad = 1 + for fullname in subdirs: + if recursedown(fullname): bad = 1 + return bad + +def fix(filename): + dbg('fix(' + `filename` + ')\n') + try: + f = open(filename, 'r') + except IOError, msg: + err(filename + ': cannot open: ' + `msg` + '\n') + return 1 + head, tail = path.split(filename) + tempname = path.join(head, '@' + tail) + g = None + # If we find a match, we rewind the file and start over but + # now copy everything to a temp file. + lineno = 0 + while 1: + line = f.readline() + if not line: break + lineno = lineno + 1 + while line[-2:] == '\\\n': + nextline = f.readline() + if not nextline: break + line = line + nextline + lineno = lineno + 1 + newline = fixline(line) + if newline != line: + if g is None: + try: + g = open(tempname, 'w') + except IOError, msg: + f.close() + err(tempname+': cannot create: '+\ + `msg`+'\n') + return 1 + f.seek(0) + lineno = 0 + rep(filename + ':\n') + continue # restart from the beginning + rep(`lineno` + '\n') + rep('< ' + line) + rep('> ' + newline) + if g is not None: + g.write(newline) + + # End of file + f.close() + if not g: return 0 # No changes + + # Finishing touch -- move files + + # First copy the file's mode to the temp file + try: + statbuf = posix.stat(filename) + posix.chmod(tempname, statbuf[ST_MODE] & 07777) + except posix.error, msg: + err(tempname + ': warning: chmod failed (' + `msg` + ')\n') + # Then make a backup of the original file as filename~ + try: + posix.rename(filename, filename + '~') + except posix.error, msg: + err(filename + ': warning: backup failed (' + `msg` + ')\n') + # Now move the temp file to the original file + try: + posix.rename(tempname, filename) + except posix.error, msg: + err(filename + ': rename failed (' + `msg` + ')\n') + return 1 + # Return succes + return 0 + +PAT1 = '\<\(if\|elif\|while\)\>[\0-\377]*[^<>!=]\(=\)[^=][\0-\377]*[^[]:[^]]' +# \2 \3 +PAT2 = '\<return\>[\0-\377]*[^<>!=]\(=\)[^=]' +# \4 +PAT = '^[ \t]*\(' + PAT1 + '\|' + PAT2 + '\)' +# \1 +prog = regex.compile(PAT) + +def fixline(line): + while prog.match(line) >= 0: + regs = prog.regs + if regs[3] == (-1, -1): + a, b = regs[4] + else: + a, b = regs[3] + if not 0 < a < b < len(line): + dbg('Weird: ' + line) + break + line = line[:a] + '==' + line[b:] + return line + +main() |