Package distutils :: Module text_file :: Class TextFile
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_ClassType TextFile

Provides a file-like object that takes care of all the things you
commonly want to do when processing a text file that has some
line-by-line syntax: strip comments (as long as "#" is your
comment character), skip blank lines, join adjacent lines by
escaping the newline (ie. backslash at end of line), strip
leading and/or trailing whitespace.  All of these are optional
and independently controllable.

Provides a 'warn()' method so you can generate warning messages that
report physical line number, even if the logical line in question
spans multiple physical lines.  Also provides 'unreadline()' for
implementing line-at-a-time lookahead.

Constructor is called as:

    TextFile (filename=None, file=None, **options)

It bombs (RuntimeError) if both 'filename' and 'file' are None;
'filename' should be a string, and 'file' a file object (or
something that provides 'readline()' and 'close()' methods).  It is
recommended that you supply at least 'filename', so that TextFile
can include it in warning messages.  If 'file' is not supplied,
TextFile creates its own using the 'open()' builtin.

The options are all boolean, and affect the value returned by
'readline()':
  strip_comments [default: true]
    strip from "#" to end-of-line, as well as any whitespace
    leading up to the "#" -- unless it is escaped by a backslash
  lstrip_ws [default: false]
    strip leading whitespace from each line before returning it
  rstrip_ws [default: true]
    strip trailing whitespace (including line terminator!) from
    each line before returning it
  skip_blanks [default: true}
    skip lines that are empty *after* stripping comments and
    whitespace.  (If both lstrip_ws and rstrip_ws are false,
    then some lines may consist of solely whitespace: these will
    *not* be skipped, even if 'skip_blanks' is true.)
  join_lines [default: false]
    if a backslash is the last non-newline character on a line
    after stripping comments and whitespace, join the following line
    to it to form one "logical line"; if N consecutive lines end
    with a backslash, then N+1 physical lines will be joined to
    form one logical line.
  collapse_join [default: false]
    strip leading whitespace from lines that are joined to their
    predecessor; only matters if (join_lines and not lstrip_ws)

Note that since 'rstrip_ws' can strip the trailing newline, the
semantics of 'readline()' must differ from those of the builtin file
object's 'readline()' method!  In particular, 'readline()' returns
None for end-of-file: an empty string might just be a blank line (or
an all-whitespace line), if 'rstrip_ws' is true but 'skip_blanks' is
not.

Instance Methods [hide private]
 
__init__(self, filename=None, file=None, **options)
Construct a new TextFile object.
 
open(self, filename)
Open a new file named 'filename'.
 
close(self)
Close the current file and forget everything we know about it (filename, current line number).
 
gen_error(self, msg, line=None)
 
error(self, msg, line=None)
 
warn(self, msg, line=None)
Print (to stderr) a warning message tied to the current logical line in the current file.
 
readline(self)
Read and return a single logical line from the current file (or from an internal buffer if lines have previously been "unread" with 'unreadline()').
 
readlines(self)
Read and return the list of all logical lines remaining in the current file.
 
unreadline(self, line)
Push 'line' (a string) onto an internal buffer that will be checked by future 'readline()' calls.
Class Variables [hide private]
  default_options = {'collapse_join': 0, 'join_lines': 0, 'lstri...
Method Details [hide private]

__init__(self, filename=None, file=None, **options)
(Constructor)

 

Construct a new TextFile object. At least one of 'filename' (a string) and 'file' (a file-like object) must be supplied. They keyword argument options are described above and affect the values returned by 'readline()'.

open(self, filename)

 

Open a new file named 'filename'. This overrides both the 'filename' and 'file' arguments to the constructor.

warn(self, msg, line=None)

 

Print (to stderr) a warning message tied to the current logical line in the current file. If the current logical line in the file spans multiple physical lines, the warning refers to the whole range, eg. "lines 3-5". If 'line' supplied, it overrides the current line number; it may be a list or tuple to indicate a range of physical lines, or an integer for a single physical line.

readline(self)

 

Read and return a single logical line from the current file (or from an internal buffer if lines have previously been "unread" with 'unreadline()'). If the 'join_lines' option is true, this may involve reading multiple physical lines concatenated into a single string. Updates the current line number, so calling 'warn()' after 'readline()' emits a warning about the physical line(s) just read. Returns None on end-of-file, since the empty string can occur if 'rstrip_ws' is true but 'strip_blanks' is not.

unreadline(self, line)

 

Push 'line' (a string) onto an internal buffer that will be checked by future 'readline()' calls. Handy for implementing a parser with line-at-a-time lookahead.


Class Variable Details [hide private]

default_options

Value:
{'collapse_join': 0,
 'join_lines': 0,
 'lstrip_ws': 0,
 'rstrip_ws': 1,
 'skip_blanks': 1,
 'strip_comments': 1}