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provides the TextFile class, which gives an interface to text files
that (optionally) takes care of stripping comments, ignoring blank
lines, and joining lines with backslashes.s8 $Id: text_file.py 29687 2002-11-14 02:25:42Z akuchling $iÿÿÿÿ( t *Nt TextFilec B sª e Z d Z h d d <d d <d d <d d <d d <d d <Z d d d „ Z d
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RS( s§ 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.i t strip_commentst skip_blanksi t lstrip_wst rstrip_wst
join_linest
collapse_joinc K s | d j o | d j o
t d ‚ n xV | i i ƒ D]E } | i | ƒ o t | | | | ƒ q7 t | | | i | ƒ q7 Wx8 | i ƒ D]* } | i i | ƒ p t d | ‚ q q W| d j o | i | ƒ n | | _ | | _ d | _
g | _ d S( sü 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()'.s7 you must supply either or both of 'filename' and 'file's invalid TextFile option '%s'i N( t Nonet RuntimeErrort default_optionst keyst has_keyt setattrt KeyErrort opent filenamet filet current_linet linebuf( t selfR R t optionst opt( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt __init__O s$
c C s+ | | _ t | i d ƒ | _ d | _ d S( sy Open a new file named 'filename'. This overrides both the
'filename' and 'file' arguments to the constructor.t ri N( R R R R ( R R ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyR t s c C s, | i i ƒ d | _ d | _ d | _ d S( si Close the current file and forget everything we know about it
(filename, current line number).N( R t closeR R R ( R ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyR } s
c C sœ g } | d j o
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lines %d-%d: s line %d: t ( R R t appendR t typet ListTypet TupleTypet tuplet strt stringt join( R t msgt linet outmsg( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt gen_error‡ s
c C s t d | i | | ƒ ‚ d S( Ns error: ( t
ValueErrorR& ( R R# R$ ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt error” s c C s( t i i d | i | | ƒ d ƒ d S( sÁ 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.s warning: s
N( t syst stderrt writeR& ( R R# R$ ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt warn— s c C s | i o | i d } | i d =| Sn d } xÍ| i i ƒ } | d j o
d } n | i oµ | o® t i | d ƒ } | d j o q| d j p | | d d j oP | d d j o d p d } | d | !| } t i | ƒ d j o q2 qqt i | d d ƒ } n | i oŸ | o˜ | d j o | i
d ƒ | Sn | i o t i | ƒ } n | | } t
| i ƒ t j o | i d d | i d <q| i | i d g | _ nT | d j o d Sn t
| i ƒ t j o | i d d | _ n | i d | _ | i o | i o t i | ƒ } n; | i o t i | ƒ } n | i o t i | ƒ } n | d j p
| d j o | i o q2 n | i oO | d d j o | d } q2 n | d
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sU 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.iÿÿÿÿR t #i i s \s
s \#s2 continuation line immediately precedes end-of-fileiþÿÿÿs \
N( R R t readlineR R R! t findt stript replaceR R, R t lstripR R R R R t rstripR ( R R$ t buildup_linet post eol( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyR. ¢ sf
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c C s> g } x1 | i ƒ } | d j o | Sn | i | ƒ q d S( sW Read and return the list of all logical lines remaining in the
current file.N( R. R R ( R t linesR$ ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt readlines s
c C s | i i | ƒ d S( s· 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.N( R R ( R R$ ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt
unreadline, s N( t __name__t
__module__t __doc__R
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s 8
%
~ t __main__sE # test file
line 3 \
# intervening comment
continues on next line
c C s | d S( s
( ( t x( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt <lambda>< s s
i s line 3 \
s continues on next line
s # test file
s # intervening comment
s line 3 \s continues on next lines line 3 continues on next lines line 3 continues on next linec C sS | i ƒ } | | j o d | | f GHn$ d | | f GHd GH| GHd GH| GHd S( Ns
ok %d (%s)s not ok %d (%s):s ** expected:s ** received:( R8 ( t countt descriptionR t expected_resultt result( ( s/ /usr/local/lib/python2.5/distutils/text_file.pyt
test_inputU s
s test.txtt wR R R R i s
no processingi s strip commentsi s strip blanksi s default processingR i s join lines without collapsingR i s join lines with collapsing( R< t __revision__t typesR) t osR! R R: t test_datat mapt splitt result1t result2t result3t result4t result5t result6RD R R t out_fileR+ R t in_filet remove( ( ( s/ /usr/local/lib/python2.5/distutils/text_file.pys <module> sT
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