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Diffstat (limited to 'Lib/dos-8x3/fileinpu.py')
| -rw-r--r-- | Lib/dos-8x3/fileinpu.py | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/Lib/dos-8x3/fileinpu.py b/Lib/dos-8x3/fileinpu.py deleted file mode 100644 index d1b7617..0000000 --- a/Lib/dos-8x3/fileinpu.py +++ /dev/null @@ -1,268 +0,0 @@ -"""Helper class to quickly write a loop over all standard input files. - -Typical use is: - - import fileinput - for line in fileinput.input(): - process(line) - -This iterates over the lines of all files listed in sys.argv[1:], -defaulting to sys.stdin if the list is empty. If a filename is '-' it -is also replaced by sys.stdin. To specify an alternative list of -filenames, pass it as the argument to input(). A single file name is -also allowed. - -Functions filename(), lineno() return the filename and cumulative line -number of the line that has just been read; filelineno() returns its -line number in the current file; isfirstline() returns true iff the -line just read is the first line of its file; isstdin() returns true -iff the line was read from sys.stdin. Function nextfile() closes the -current file so that the next iteration will read the first line from -the next file (if any); lines not read from the file will not count -towards the cumulative line count; the filename is not changed until -after the first line of the next file has been read. Function close() -closes the sequence. - -Before any lines have been read, filename() returns None and both line -numbers are zero; nextfile() has no effect. After all lines have been -read, filename() and the line number functions return the values -pertaining to the last line read; nextfile() has no effect. - -All files are opened in text mode. If an I/O error occurs during -opening or reading a file, the IOError exception is raised. - -If sys.stdin is used more than once, the second and further use will -return no lines, except perhaps for interactive use, or if it has been -explicitly reset (e.g. using sys.stdin.seek(0)). - -Empty files are opened and immediately closed; the only time their -presence in the list of filenames is noticeable at all is when the -last file opened is empty. - -It is possible that the last line of a file doesn't end in a newline -character; otherwise lines are returned including the trailing -newline. - -Class FileInput is the implementation; its methods filename(), -lineno(), fileline(), isfirstline(), isstdin(), nextfile() and close() -correspond to the functions in the module. In addition it has a -readline() method which returns the next input line, and a -__getitem__() method which implements the sequence behavior. The -sequence must be accessed in strictly sequential order; sequence -access and readline() cannot be mixed. - -Optional in-place filtering: if the keyword argument inplace=1 is -passed to input() or to the FileInput constructor, the file is moved -to a backup file and standard output is directed to the input file. -This makes it possible to write a filter that rewrites its input file -in place. If the keyword argument backup=".<some extension>" is also -given, it specifies the extension for the backup file, and the backup -file remains around; by default, the extension is ".bak" and it is -deleted when the output file is closed. In-place filtering is -disabled when standard input is read. XXX The current implementation -does not work for MS-DOS 8+3 filesystems. - -XXX Possible additions: - -- optional getopt argument processing -- specify open mode ('r' or 'rb') -- specify buffer size -- fileno() -- isatty() -- read(), read(size), even readlines() - -""" - -import sys, os, stat - -_state = None - -def input(files=None, inplace=0, backup=""): - global _state - if _state and _state._file: - raise RuntimeError, "input() already active" - _state = FileInput(files, inplace, backup) - return _state - -def close(): - global _state - state = _state - _state = None - if state: - state.close() - -def nextfile(): - if not _state: - raise RuntimeError, "no active input()" - return _state.nextfile() - -def filename(): - if not _state: - raise RuntimeError, "no active input()" - return _state.filename() - -def lineno(): - if not _state: - raise RuntimeError, "no active input()" - return _state.lineno() - -def filelineno(): - if not _state: - raise RuntimeError, "no active input()" - return _state.filelineno() - -def isfirstline(): - if not _state: - raise RuntimeError, "no active input()" - return _state.isfirstline() - -def isstdin(): - if not _state: - raise RuntimeError, "no active input()" - return _state.isstdin() - -class FileInput: - - def __init__(self, files=None, inplace=0, backup=""): - if type(files) == type(''): - files = (files,) - else: - if files is None: - files = sys.argv[1:] - if not files: - files = ('-',) - else: - files = tuple(files) - self._files = files - self._inplace = inplace - self._backup = backup - self._savestdout = None - self._output = None - self._filename = None - self._lineno = 0 - self._filelineno = 0 - self._file = None - self._isstdin = 0 - self._backupfilename = None - - def __del__(self): - self.close() - - def close(self): - self.nextfile() - self._files = () - - def __getitem__(self, i): - if i != self._lineno: - raise RuntimeError, "accessing lines out of order" - line = self.readline() - if not line: - raise IndexError, "end of input reached" - return line - - def nextfile(self): - savestdout = self._savestdout - self._savestdout = 0 - if savestdout: - sys.stdout = savestdout - - output = self._output - self._output = 0 - if output: - output.close() - - file = self._file - self._file = 0 - if file and not self._isstdin: - file.close() - - backupfilename = self._backupfilename - self._backupfilename = 0 - if backupfilename and not self._backup: - try: os.unlink(backupfilename) - except: pass - - self._isstdin = 0 - - def readline(self): - if not self._file: - if not self._files: - return "" - self._filename = self._files[0] - self._files = self._files[1:] - self._filelineno = 0 - self._file = None - self._isstdin = 0 - self._backupfilename = 0 - if self._filename == '-': - self._filename = '<stdin>' - self._file = sys.stdin - self._isstdin = 1 - else: - if self._inplace: - self._backupfilename = ( - self._filename + (self._backup or ".bak")) - try: os.unlink(self._backupfilename) - except os.error: pass - # The next few lines may raise IOError - os.rename(self._filename, self._backupfilename) - self._file = open(self._backupfilename, "r") - try: - perm = os.fstat(self._file.fileno())[stat.ST_MODE] - except: - self._output = open(self._filename, "w") - else: - fd = os.open(self._filename, - os.O_CREAT | os.O_WRONLY | os.O_TRUNC, - perm) - self._output = os.fdopen(fd, "w") - try: - os.chmod(self._filename, perm) - except: - pass - self._savestdout = sys.stdout - sys.stdout = self._output - else: - # This may raise IOError - self._file = open(self._filename, "r") - line = self._file.readline() - if line: - self._lineno = self._lineno + 1 - self._filelineno = self._filelineno + 1 - return line - self.nextfile() - # Recursive call - return self.readline() - - def filename(self): - return self._filename - - def lineno(self): - return self._lineno - - def filelineno(self): - return self._filelineno - - def isfirstline(self): - return self._filelineno == 1 - - def isstdin(self): - return self._isstdin - -def _test(): - import getopt - inplace = 0 - backup = 0 - opts, args = getopt.getopt(sys.argv[1:], "ib:") - for o, a in opts: - if o == '-i': inplace = 1 - if o == '-b': backup = a - for line in input(args, inplace=inplace, backup=backup): - if line[-1:] == '\n': line = line[:-1] - if line[-1:] == '\r': line = line[:-1] - print "%d: %s[%d]%s %s" % (lineno(), filename(), filelineno(), - isfirstline() and "*" or "", line) - print "%d: %s[%d]" % (lineno(), filename(), filelineno()) - -if __name__ == '__main__': - _test() |