On Sep 21, 10:59 am, Nobody nob...@nowhere.com wrote:
I have a similar question.
What I want: a tokeniser generator which can take a lex-style grammar (not
necessarily lex syntax, but a set of token specifications defined by
REs, BNF, or whatever), generate a DFA, then run the DFA on
On Tue, 22 Sep 2009 17:07:33 +1200, greg wrote:
What I want: a tokeniser generator which can take a lex-style grammar (not
necessarily lex syntax, but a set of token specifications defined by
REs, BNF, or whatever), generate a DFA, then run the DFA on sequences of
bytes. It must allow the
On Sat, 19 Sep 2009 13:21:58 -0700, Peng Yu wrote:
I did a google search and found various parser in python that can be
used to parse different files in various situation. I don't see a page
that summarizes and compares all the available parsers in python, from
simple and easy-to-use ones to
Nobody wrote:
What I want: a tokeniser generator which can take a lex-style grammar (not
necessarily lex syntax, but a set of token specifications defined by
REs, BNF, or whatever), generate a DFA, then run the DFA on sequences of
bytes. It must allow the syntax to be defined at run-time.
You
On Sep 19, 9:34 pm, Peng Yu pengyu...@gmail.com wrote:
On Sep 19, 6:05 pm, Robert Kern robert.k...@gmail.com wrote:
http://nedbatchelder.com/text/python-parsers.html
This is more a less just a list of parsers. I would like some detailed
guidelines on which one to choose for various parsing
On Sun, Sep 20, 2009 at 6:50 AM, andrew cooke and...@acooke.org wrote:
On Sep 19, 9:34 pm, Peng Yu pengyu...@gmail.com wrote:
On Sep 19, 6:05 pm, Robert Kern robert.k...@gmail.com wrote:
http://nedbatchelder.com/text/python-parsers.html
This is more a less just a list of parsers. I would like
On Sep 20, 8:11 am, Peng Yu pengyu...@gmail.com wrote:
On Sun, Sep 20, 2009 at 6:50 AM, andrew cooke and...@acooke.org wrote:
On Sep 19, 9:34 pm, Peng Yu pengyu...@gmail.com wrote:
On Sep 19, 6:05 pm, Robert Kern robert.k...@gmail.com wrote:
http://nedbatchelder.com/text/python-parsers.html
On Sep 19, 11:39 pm, TerryP bigboss1...@gmail.com wrote:
[...]
For flat data, simple unix style rc or dos style ini file will often
suffice, and writing a parser is fairly trivial; in fact writing a
[...]
python already includes parsers for .ini configuration files.
[...]
The best way to
One word of warning - the documentation for that format says at the
beginning that it is compressed in some way. I am not sure if that
means within some program, or on disk. But most parsers will not be
much use with a compressed file - you will need to uncompress it first.
--
On Sun, Sep 20, 2009 at 7:20 AM, andrew cooke and...@acooke.org wrote:
On Sep 20, 8:11 am, Peng Yu pengyu...@gmail.com wrote:
On Sun, Sep 20, 2009 at 6:50 AM, andrew cooke and...@acooke.org wrote:
On Sep 19, 9:34 pm, Peng Yu pengyu...@gmail.com wrote:
On Sep 19, 6:05 pm, Robert Kern
The file size of a wig file can be very large (GB). Most tasks on this
file format does not need the parser to save all the lines read from
the file in the memory to produce the parsing result. I'm wondering if
pyparsing is capable of parsing large wig files by keeping only
minimum required
also, parsing large files may be slow. in which case you may be
better with a non-python solution (even if you call it from python).
your file format is so simple that you may find a lexer is enough for
what you want, and they should be stream oriented. have a look at the
shlex package that is
On Sun, Sep 20, 2009 at 8:19 AM, andrew cooke and...@acooke.org wrote:
also, parsing large files may be slow. in which case you may be
better with a non-python solution (even if you call it from python).
your file format is so simple that you may find a lexer is enough for
what you want,
I don't quite understand this point. If I don't use a parser, since
python can read numbers line by line, why I need a lexer package?
for the lines of numbers it would make no difference; for the track
definition lines it would save you some work.
as you said, this is a simple format, so the
On Sun, Sep 20, 2009 at 8:49 AM, andrew cooke and...@acooke.org wrote:
I don't quite understand this point. If I don't use a parser, since
python can read numbers line by line, why I need a lexer package?
for the lines of numbers it would make no difference; for the track
definition lines it
So for the track definition, using a lexer package would be better
than using regex in python, right?
they are similar. a lexer is really just a library that packages
regular expressions in a certain way. so you could write your own
code and you would really be writing a simple lexer. the
Peng Yu wrote:
The file size of a wig file can be very large (GB). Most tasks on this
file format does not need the parser to save all the lines read from
the file in the memory to produce the parsing result. I'm wondering if
pyparsing is capable of parsing large wig files by keeping only
On Sep 20, 9:12 am, andrew cooke and...@acooke.org wrote:
ps is there somewhere can download example files? this would be
useful for my own testing. thanks.
i replied to a lot of your questions here; any chance you could reply
to this one of mine?
the wig format looks like it could be a good
On Sun, Sep 20, 2009 at 1:35 PM, andrew cooke and...@acooke.org wrote:
On Sep 20, 9:12 am, andrew cooke and...@acooke.org wrote:
ps is there somewhere can download example files? this would be
useful for my own testing. thanks.
i replied to a lot of your questions here; any chance you could
On Sep 20, 3:16 pm, Peng Yu pengyu...@gmail.com wrote:
On Sun, Sep 20, 2009 at 1:35 PM, andrew cooke and...@acooke.org wrote:
On Sep 20, 9:12 am, andrew cooke and...@acooke.org wrote:
ps is there somewhere can download example files? this would be
useful for my own testing. thanks.
i
On Sep 19, 9:34 pm, Peng Yu pengyu...@gmail.com wrote:
On Sep 19, 6:05 pm, Robert Kern robert.k...@gmail.com wrote:
Peng Yu wrote:
Hi,
I did a google search and found various parser in python that can be
used to parse different files in various situation. I don't see a page
that
Hi,
I did a google search and found various parser in python that can be
used to parse different files in various situation. I don't see a page
that summarizes and compares all the available parsers in python, from
simple and easy-to-use ones to complex and powerful ones.
I am wondering if
Peng Yu wrote:
Hi,
I did a google search and found various parser in python that can be
used to parse different files in various situation. I don't see a page
that summarizes and compares all the available parsers in python, from
simple and easy-to-use ones to complex and powerful ones.
On Sep 19, 6:05 pm, Robert Kern robert.k...@gmail.com wrote:
Peng Yu wrote:
Hi,
I did a google search and found various parser in python that can be
used to parse different files in various situation. I don't see a page
that summarizes and compares all the available parsers in python,
Peng Yu wrote:
This is more a less just a list of parsers. I would like some detailed
guidelines on which one to choose for various parsing problems.
Regards,
Peng
It depends on the parsing problem.
Obviously your not going to use an INI parser to work with XML, or
vice versa. Likewise
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