ply-hack Google Group

ply custom token precedence

n210241048...@gmail.com (Robert Grosse) — Sat, 30 Mar 2013 03:49:32 UT

I suggest adding a way to provide a custom precedence for the token regexs.
I'm currently stuck because as far as I can tell, there isn't one.
Currently, it always sorts by the first line number of the function, which
is nice if you're defining the functions manually, but a huge pain if
you're defining the rules programmatically. Since

Redirecting Ply error messages

garl...@csail.mit.edu (Steve Garland) — Mon, 14 Jan 2013 19:37:33 UT

I am using Ply to parse information supplied to an HTML form. Is there some way
to have Ply append error messages to a list from which they can be retrieved by
the Python script I use to process the form? Since the HTML form and the Python
script will be hosted on a machine that is not under my control, I would prefer

advise on using ply

kene.men...@illom.org (Kene Meniru) — Mon, 24 Dec 2012 12:16:40 UT

Hello: I am writing a program that is made up of a collection of POV-Ray
macros. POV-Ray is available at povray.org. It is a ray-tracing program that
reads a scene description language (SDL) to create photo-realistic images.
At this time my program (for modeling building information) is so huge that

p_error parameters lack information

n210241048...@gmail.com (Robert Grosse) — Mon, 29 Oct 2012 02:15:14 UT

One can define a p_error function to handle syntax errors, but
unfortunately, Ply provides no useful information to the function. I've had
to resort to an ugly reflection hack just to provide meaningful error
messages. Would it be possible to improve the interface so that Ply
actually provides access to this information?

preserving whitespace

enriquepa...@gmail.com (Enrique Pérez) — Fri, 26 Oct 2012 14:48:15 UT

I am writing a parser for a grammar, and I want to allow Python sections
(delimitd by '\n<-\n' and '\n->\n') within code generated from that
grammar. I do not want to parse Python; I will feed it to exec. I just want
to get the whole lines, including whitespace.
This is in my lexer:
def t_begin_pycode(self, t):

Help with Java's <<

ere...@gmail.com (Erez) — Thu, 04 Oct 2012 17:58:37 UT

Hi, I'm trying to parse Java and it's going ok so far, except for one
problem that I just can't solve, regarding the > token.
Consider the following 3 lines:
someType<anotherType>> a;
if (b > c)
d >> e;
If I define shift-right as:
SHR: '>>'
expression: var SHR var
then the lexer will match the template code, and the parser will break.

Why 'Illegal character" happens?

tchol...@gmail.com (Konstantin Tcholokachvili) — Sat, 04 Aug 2012 22:45:59 UT

Hello,

I defined rules, which I think are correct but I got an error indicating me
"Illegal character'.

More details are here:
[link]

Can you tell me what is the reason?

Thank you in advance.

Konstantin Tcholokachvili

100 groups in python re limitation slows down PLY performance

viy....@gmail.com (viy) — Fri, 17 Aug 2012 12:52:09 UT

Hi all, jfyi
I've added just one token to my lexer rules and stuck in 100 groups limit
in python re
[link]
PLY has workaround in its code - when your master re exceeds 100 groups,
PLY catches AssertionError from python, splits master re into parts and

Problem with empty production. Syntax error on supposedly correct input.

grzegorzmi...@gmail.com (Grzegorz Milka) — Tue, 31 Jul 2012 15:54:03 UT

Hello,

I decided to use ply to implement assembler from "Elements of computer
systems" and in the process I noticed an unexpected behaviour (error
on someone's part) on something that in my opinion looks ok.

Here's the program showing the error:

import ply.lex as lex
import ply.yacc as yacc

experimental python library for SQL queries

jeffery.kl...@gmail.com (Jeff) — Thu, 19 Jul 2012 15:40:14 UT

Hi all,
I tried posting this a few weeks ago, but I still have not seen it show up
on this list. If this message shows up as a duplicate, I am sorry for the
spam.
I have written a Python library that allows one to express general SELECT
queries as a string of text, but without raw SQL. The parsing is done

ply handling huge files

saravanan.manickanai...@gmail.com (PyRate) — Tue, 17 Jul 2012 09:54:58 UT

Hi,
Recently I was developing a parser to parse text files with a
particular format. The huge file sizes made it to hang. So I read the file
in chunks and passed it to ply. But this caused the whole parser to break
as the tokens sometime fall between the file chunks. This lead me to add
some code to the lex and yacc module of ply so that it loads file chunks if

Yacc - nesting of if - else if - else - end ifstatements

joshuabo...@gmail.com (Joshua Boshi) — Thu, 12 Jul 2012 16:19:05 UT

Hi all!
can somebody help me with writing correct grammar rules for nested if
statements?
In my language, I am able to write constructions like this:
(IF CONDITION)
some statements
(IF CONDITION)
some statements
(ELSE IF CONDITION)
some statements
(ELSE IF CONDITION)
some statements
(ELSE IF CONDITION)

Parsing strace output: a job for PLY?

kten...@gmail.com (Kent Tenney) — Mon, 02 Jul 2012 19:39:56 UT

Howdy,

Necessity has spawned an attempt to invent a tool to explain strace output.

I am trying to figure out why my installation of Shotwell isn't responding
to configuration correctly, strace offers debugging help.

I'm examining the output of
$ strace -o shotwell.strace shotwell

I've written a class which maintains the current fd:filename association,