#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
\begin_document
\begin_header
\textclass literate-article
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%
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\end_header

\begin_body

\begin_layout Title
LyX listerrors:
\begin_inset Newline newline
\end_inset

rewritten in Python
\end_layout

\begin_layout Author
Kayvan A.
 Sylvan
\begin_inset Newline newline
\end_inset


\begin_inset Flex URL
status collapsed

\begin_layout Plain Layout

mailto:kayvan@sylvan.com
\end_layout

\end_inset


\end_layout

\begin_layout Date
3/15/2002
\end_layout

\begin_layout Abstract
The listerrors program used to be compiled as a C program and installed
 as 
\emph on
BINDIR/listerrors
\emph default
 along with LyX in order to perform some simple re-formatting of noweb and
 GCC error messages.
 This document describes and implements the Python version of the same program.
\end_layout

\begin_layout Standard
\begin_inset CommandInset toc
LatexCommand tableofcontents

\end_inset


\end_layout

\begin_layout Section
Introduction
\end_layout

\begin_layout Standard
The motivation for this program was LyX bug 190
\begin_inset Foot
status collapsed

\begin_layout Plain Layout
Visit 
\begin_inset Flex URL
status collapsed

\begin_layout Plain Layout

http://www.lyx.org/trac/ticket/190
\end_layout

\end_inset

 for the details.
\end_layout

\end_inset

 dealing with the 
\begin_inset Quotes eld
\end_inset

listerrors
\begin_inset Quotes erd
\end_inset

 executable.
\end_layout

\begin_layout Standard
What is 
\begin_inset Quotes eld
\end_inset

listerrors
\begin_inset Quotes erd
\end_inset

? Usually, LyX has great support for parsing of error messages.
 For each error in the log file, LyX pops up an error box at that location
 in the LyX window.
 The error scanning routines expect these errors to be in a certain format
 (similar to LaTeX errors).
 When dealing with Literate Programs, you have 
\begin_inset Quotes eld
\end_inset

noweb
\begin_inset Foot
status collapsed

\begin_layout Plain Layout
See 
\begin_inset Flex URL
status collapsed

\begin_layout Plain Layout

http://www.eecs.harvard.edu/~nr/noweb
\end_layout

\end_inset

 for more information about noweb.
\end_layout

\end_inset


\begin_inset Quotes erd
\end_inset

 as well as gcc error messages (and potentially others).
 The listerrors program attempts to standardize these error messages to
 a format that LyX can parse and react to.
\end_layout

\begin_layout Standard
In a nutshell, the problems with the old implementation of listerrors that
 bug 190 refers to were::
\end_layout

\begin_layout Enumerate
It was a C program and it was installed in the user path in the same directory
 as LyX.
 Having such a generically named binary in, for example, 
\emph on
/usr/bin
\emph default
, was potentially confusing.
\end_layout

\begin_layout Enumerate
It required that noweb be installed on the compiling machine (the source
 was extracted by noweb from 
\emph on
SRCDIR/examples/Literate.lyx
\emph default
, compiled and installed by 
\begin_inset Quotes eld
\end_inset

make install
\begin_inset Quotes erd
\end_inset

).
\end_layout

\begin_layout Standard
The new version deals with these problems in the following fashion:
\end_layout

\begin_layout Enumerate
Both the example file (this document) and the program are to be added to
 the LyX CVS repository.
\end_layout

\begin_layout Enumerate
The program itself will be installed in 
\emph on
SHAREDIR/lyx/scripts
\emph default
, along with other LyX-specific helper scripts.
\end_layout

\begin_layout Standard
In the design and implementation of this new 
\begin_inset Quotes eld
\end_inset

listerrors
\begin_inset Quotes erd
\end_inset

, the Python
\begin_inset Foot
status collapsed

\begin_layout Plain Layout
See the Python home page (
\begin_inset Flex URL
status collapsed

\begin_layout Plain Layout

http://www.python.org
\end_layout

\end_inset

) for more information.
\end_layout

\end_inset

 language was chosen since it is fully multi-platform and provides a very
 uniform and easy to read syntax.
 This re-write also simplifies the code for 
\begin_inset Quotes eld
\end_inset

listerrors
\begin_inset Quotes erd
\end_inset

 greatly.
 Python is installed by default on all modern Linux systems and is freely
 available for all other platforms.
\end_layout

\begin_layout Scrap
<<listerrors>>=
\end_layout

\begin_layout Scrap
#!/usr/bin/python -tt
\end_layout

\begin_layout Scrap
"""reformat noweb and compiler errors for LyX.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
Expects to read from stdin and output to stdout.
\end_layout

\begin_layout Scrap
"""
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
__author__ = "Kayvan A.
 Sylvan <kayvan@sylvan.com>"
\end_layout

\begin_layout Scrap
__date__ = "$Date: 2005/07/18 09:42:26 $"
\end_layout

\begin_layout Scrap
__version__ = "$Revision: 1.5 $"
\end_layout

\begin_layout Scrap
__credits__ = """Edmar Wienskoski Jr.
 <edmar-w-jr@technologist.com>
\end_layout

\begin_layout Scrap
    original Literate support for LyX.
\end_layout

\begin_layout Scrap
Bernard Michael Hurley <berhardh@westherts.ac.uk>
\end_layout

\begin_layout Scrap
    modifications to original listerrors."""
\end_layout

\begin_layout Scrap
__copyright__ = "Copyright 2002 - Kayvan Sylvan."
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
import sys, string
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
<<Function Bodies>>
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
if __name__ == "__main__":
\end_layout

\begin_layout Scrap
  main()
\end_layout

\begin_layout Scrap
@
\end_layout

\begin_layout Section
LaTeX style error message
\end_layout

\begin_layout Standard
The following function mimics the TeX error message format.
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def write_error(msg, tool = "noweb", line_number = 1):
\end_layout

\begin_layout Scrap
  """Write out the given message in TeX error style.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  called like: write_error(msg, tool, line_number)."""
\begin_inset Newline newline
\end_inset

  print "! Build Error: ==> %s ==>
\backslash
n" % (tool),
\begin_inset Newline newline
\end_inset

  print " ...
\backslash
n
\backslash
nl.%d ...
\backslash
n" % (line_number),
\begin_inset Newline newline
\end_inset

  if type(msg) == type("str"): # simple string
\begin_inset Newline newline
\end_inset

    print msg
\begin_inset Newline newline
\end_inset

  else: # some kind of list (sequence or tuple)
\begin_inset Newline newline
\end_inset

    for m in msg:
\begin_inset Newline newline
\end_inset

        if m != "": print m,
\begin_inset Newline newline
\end_inset

    print
\begin_inset Newline newline
\end_inset


\begin_inset Newline newline
\end_inset

@ %def write_error
\end_layout

\begin_layout Section
Filtering errors
\end_layout

\begin_layout Standard
The only complication in our filtering code is that some parsers might need
 to push back lines that are read in to be read again later.
 We solve this problem by implementing a 
\begin_inset Quotes eld
\end_inset

getline
\begin_inset Quotes erd
\end_inset

 and 
\begin_inset Quotes eld
\end_inset

pushline
\begin_inset Quotes erd
\end_inset

 set of functions:
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
__lines = [] # lines pushed back
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
def getline(file = sys.stdin):
\end_layout

\begin_layout Scrap
  """read a line from internal stack or from file.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  optional file argument defaults to sys.stdin."""
\end_layout

\begin_layout Scrap
  global __lines
\end_layout

\begin_layout Scrap
  lines = __lines
\end_layout

\begin_layout Scrap
  if lines:
\end_layout

\begin_layout Scrap
    line = lines.pop()
\end_layout

\begin_layout Scrap
  else:
\end_layout

\begin_layout Scrap
    line = file.readline()
\end_layout

\begin_layout Scrap
  return line
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
@ %def getline
\end_layout

\begin_layout Standard
And now for the corresponding pushline function:
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def pushline(line):
\end_layout

\begin_layout Scrap
  "push a line onto the pushback stack."
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  global __lines
\begin_inset Newline newline
\end_inset

  lines = __lines
\begin_inset Newline newline
\end_inset

  lines.append(line)
\begin_inset Newline newline
\end_inset


\begin_inset Newline newline
\end_inset

@ %def pushline
\end_layout

\begin_layout Standard
The main() entry point function is extremely simple.
 Note that this version of 
\begin_inset Quotes eld
\end_inset

listerrors
\begin_inset Quotes erd
\end_inset

 takes no options and simply filters, attempting simply to match against
 the known error message patterns.
 The listerrors C program handled a single-character command-line argument
 that the current code no longer needs.
 
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def main():
\end_layout

\begin_layout Scrap
  """Entry point for listerrors.
 Takes no options.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  Reads stdin and writes to stdout.
 Filter errors"""
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  while 1:
\end_layout

\begin_layout Scrap
    line = getline()
\end_layout

\begin_layout Scrap
    if line == "": break
\end_layout

\begin_layout Scrap
    <<Check line against patterns and take action>>
\end_layout

\begin_layout Scrap
@ %def main
\end_layout

\begin_layout Standard
For each line read in, we need to find out if it matches any of our tools
 (noweb, gcc, etc.) and act accordingly.
\end_layout

\begin_layout Scrap
<<Check line against patterns and take action>>=
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
try_patterns_dispatch = [ noweb_try, gcc_try, xlc_try ]
\begin_inset Newline newline
\end_inset

for predicate in try_patterns_dispatch:
\begin_inset Newline newline
\end_inset

  if predicate(line): break
\begin_inset Newline newline
\end_inset

@
\end_layout

\begin_layout Section
Different Error Formats
\end_layout

\begin_layout Standard
The following sections handle the various error message formats that we
 recognize in this program.
 
\end_layout

\begin_layout Subsection
noweb errors
\end_layout

\begin_layout Standard
Noweb errors are output on a single line, so examining just the current
 line is enough.
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def noweb_try(line):
\end_layout

\begin_layout Scrap
  """see if line is a noweb error.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  Returns 1 on success, 0 otherwise.
 Outputs on stdout."""
\end_layout

\begin_layout Scrap
  retval = 0
\end_layout

\begin_layout Scrap
  <<Look for the unescaped angle-brackets in documentation>>
\end_layout

\begin_layout Scrap
  <<Look for anything with double angle brackets>>
\end_layout

\begin_layout Scrap
  <<Last ditch effort scan for specific strings>>
\end_layout

\begin_layout Scrap
  return retval
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
@ %def noweb_try
\end_layout

\begin_layout Standard
First, we look for the 
\begin_inset Quotes eld
\end_inset

unescaped < < in documentation chunk
\begin_inset Quotes erd
\end_inset

 message.
 This is the only message with an associated line number from noweb.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
<<Look for the unescaped angle-brackets in documentation>>=
\end_layout

\begin_layout Scrap
if string.find(line, ": unescaped << in documentation chunk") != -1:
\end_layout

\begin_layout Scrap
  line_parts = string.split(line, ':')
\end_layout

\begin_layout Scrap
  num_str = line_parts[1]
\end_layout

\begin_layout Scrap
  num_len = len(num_str)
\end_layout

\begin_layout Scrap
  i = 0
\end_layout

\begin_layout Scrap
  while i < num_len and (num_str[i] in string.digits): i = i + 1
\end_layout

\begin_layout Scrap
  if i == num_len:
\end_layout

\begin_layout Scrap
    write_error(":" + line_parts[2], "noweb", int(num_str))
\end_layout

\begin_layout Scrap
    retval = 1
\end_layout

\begin_layout Scrap
@
\end_layout

\begin_layout Standard
Some noweb messages are simply about undefined scraps.
 These can be seen by looking for matching double-angle-brackets.
\end_layout

\begin_layout Scrap
<<Look for anything with double angle brackets>>=
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
if (not retval):
\begin_inset Newline newline
\end_inset

  left = string.find(line, "<<")
\begin_inset Newline newline
\end_inset

  if (left != -1) and ((left + 2) < len(line)) and 
\backslash

\begin_inset Newline newline
\end_inset

     (string.find(line[left+2:], ">>") != -1):
\begin_inset Newline newline
\end_inset

    write_error(line, "noweb");
\begin_inset Newline newline
\end_inset

    retval = 1;
\begin_inset Newline newline
\end_inset

@
\end_layout

\begin_layout Standard
Finally, here is an additional list of explicit strings to check for.
\end_layout

\begin_layout Scrap
<<Last ditch effort scan for specific strings>>=
\end_layout

\begin_layout Scrap
if (not retval):
\end_layout

\begin_layout Scrap
  msgs_to_try = ("couldn't open file",
\end_layout

\begin_layout Scrap
    "couldn't open temporary file",
\end_layout

\begin_layout Scrap
    "error writing temporary file",
\end_layout

\begin_layout Scrap
    "ill-formed option",
\end_layout

\begin_layout Scrap
    "unknown option",
\end_layout

\begin_layout Scrap
    "Bad format sequence",
\end_layout

\begin_layout Scrap
    "Can't open output file",
\end_layout

\begin_layout Scrap
    "Can't open temporary file",
\end_layout

\begin_layout Scrap
    "Capacity exceeded:",
\end_layout

\begin_layout Scrap
    "Ignoring unknown option -",
\end_layout

\begin_layout Scrap
    "This can't happen:",
\end_layout

\begin_layout Scrap
    "non-numeric line number in")
\end_layout

\begin_layout Scrap
  for msg in msgs_to_try:
\end_layout

\begin_layout Scrap
    if string.find(line, msg) != -1:
\end_layout

\begin_layout Scrap
      write_error(line, "noweb")
\end_layout

\begin_layout Scrap
      retval = 1
\end_layout

\begin_layout Scrap
      break
\end_layout

\begin_layout Scrap
@
\end_layout

\begin_layout Subsection
gcc errors
\end_layout

\begin_layout Standard
The gcc errors can be multi-line, with the following format:
\end_layout

\begin_layout LyX-Code
foo.c: In function `main': 
\end_layout

\begin_layout Scrap
foo.c:3: `bar' undeclared (first use in this function) 
\end_layout

\begin_layout Scrap
foo.c:3: (Each undeclared identifier is reported only once 
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
foo.c:3: for each function it appears in.) 
\begin_inset Newline newline
\end_inset

foo.c:3: parse error before `x'
\end_layout

\begin_layout Standard
In order to parse this, the gcc error handler has to look ahead and return
 any and all lines that do not match the expected pattern.
\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def gcc_try(line):
\end_layout

\begin_layout Scrap
  """See if line is a gcc error.
 Read ahead to handle all the lines.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  Returns 1 on success, 0 otherwise.
 Outputs on stdout."""
\end_layout

\begin_layout Scrap
  retval = 0
\end_layout

\begin_layout Scrap
  <<Handle the gcc error message>>
\end_layout

\begin_layout Scrap
  return retval
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
@ %def gcc_try
\end_layout

\begin_layout Standard
The error message starts with a gcc header (as above) without an associated
 line number.
\end_layout

\begin_layout Scrap
<<Handle the gcc error message>>= 
\begin_inset Newline newline
\end_inset

first_space = string.find(line, ' ')
\begin_inset Newline newline
\end_inset

if first_space > 1: # The smallest would be "X: "
\begin_inset Newline newline
\end_inset

  if line[first_space - 1] == ':':
\begin_inset Newline newline
\end_inset

    header_to_see = line[:first_space - 1]
\begin_inset Newline newline
\end_inset

    next_line = getline()
\begin_inset Newline newline
\end_inset

    if next_line and next_line[:first_space - 1] == header_to_see:
\begin_inset Newline newline
\end_inset

      num_end = first_space
\begin_inset Newline newline
\end_inset

      while next_line[num_end] in string.digits: num_end = num_end + 1
\begin_inset Newline newline
\end_inset

      if num_end > first_space: # good!
\begin_inset Newline newline
\end_inset

        <<Accumulate gcc error lines and print it>>
\begin_inset Newline newline
\end_inset

      else: # oops! Not a gcc error.
\begin_inset Newline newline
\end_inset

        pushline(next_line)
\begin_inset Newline newline
\end_inset

    elif next_line:
\begin_inset Newline newline
\end_inset

      pushline(next_line) # return this line to input stream
\begin_inset Newline newline
\end_inset

@
\end_layout

\begin_layout Standard
At the point in the code that we know that we are in the middle of an error
 message, we do the following:
\end_layout

\begin_layout Scrap
<<Accumulate gcc error lines and print it>>=
\end_layout

\begin_layout Scrap
num_str = next_line[first_space:num_end]
\end_layout

\begin_layout Scrap
msgs = [line[first_space:]]
\end_layout

\begin_layout Scrap
msgs.append(next_line[num_end + 1:])
\end_layout

\begin_layout Scrap
header_to_see = next_line[:num_end]
\end_layout

\begin_layout Scrap
next_line = getline()
\end_layout

\begin_layout Scrap
while next_line and next_line[:num_end] == header_to_see:
\end_layout

\begin_layout Scrap
  msgs.append(next_line[num_end + 1:])
\end_layout

\begin_layout Scrap
  next_line = getline()
\end_layout

\begin_layout Scrap
if next_line: pushline(next_line)
\end_layout

\begin_layout Scrap
write_error(msgs, "gcc", int(num_str))
\end_layout

\begin_layout Scrap
retval = 1
\end_layout

\begin_layout Scrap
@
\end_layout

\begin_layout Subsection
xlc errors
\end_layout

\begin_layout Standard
A xlc error message is easy to identify.
 Every error message starts with a quoted string with no spaces, a comma,
 a space, the word 
\begin_inset Quotes eld
\end_inset

line
\begin_inset Quotes erd
\end_inset

, a space, and some variable text.
 The following routine tests if a given buffer line matches this criteria
 (this code would probably be simpler if I used the 
\begin_inset Quotes eld
\end_inset

re
\begin_inset Quotes erd
\end_inset

 regexp module, but we don't really need the full regular expression engine
 here).
 
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
<<Function Bodies>>=
\end_layout

\begin_layout Scrap
def xlc_try(line):
\end_layout

\begin_layout Scrap
  """see if line is an xlc error.
\end_layout

\begin_layout Scrap

\end_layout

\begin_layout Scrap
  Returns 1 on success, 0 otherwise.
 Outputs on stdout."""
\end_layout

\begin_layout Scrap
  retval = 0
\end_layout

\begin_layout Scrap
  if line[0] == '"': # This is the first character of all xlc errors
\end_layout

\begin_layout Scrap
    next_quote = string.find(line, '"', 1)
\end_layout

\begin_layout Scrap
    first_space = string.find(line, ' ')
\end_layout

\begin_layout Scrap
    if (next_quote != -1) and (first_space > next_quote): # no space inisde
 quotes
\end_layout

\begin_layout Scrap
      if line[first_space - 1:first_space + 6] == ", line ":
\end_layout

\begin_layout Scrap
        num_start = num_end = first_space + 6
\end_layout

\begin_layout Scrap
        while line[num_end] in string.digits: num_end = num_end + 1
\end_layout

\begin_layout Scrap
        if num_end > num_start:
\end_layout

\begin_layout Scrap
          write_error(line, "xlc", int(line[num_start : num_end]))
\end_layout

\begin_layout Scrap
          retval = 1
\end_layout

\begin_layout Scrap
  return retval
\end_layout

\begin_layout Scrap
  
\end_layout

\begin_layout Scrap
@ %def xlc_try
\end_layout

\begin_layout Section
Extracting the code
\end_layout

\begin_layout Standard
This project can be tangled from LyX if you set your 
\begin_inset Quotes eld
\end_inset

Program
\begin_inset Quotes erd
\end_inset

 convertor to call a generic script that always extracts a scrap named 
\family typewriter
build-script
\family default
 and executes it.
 Here is an example of such a generic script:
\end_layout

\begin_layout LyX-Code
#!/bin/sh
\begin_inset Newline newline
\end_inset

notangle -Rbuild-script $1 | env NOWEB_SOURCE=$1 sh
\end_layout

\begin_layout Standard
This section defines our build-script, which extracts the code.
\end_layout

\begin_layout Scrap
<<build-script>>=
\end_layout

\begin_layout Scrap
#!/bin/sh
\end_layout

\begin_layout Scrap
if [ -z "$NOWEB_SOURCE" ]; then NOWEB_SOURCE=listerrors.nw; fi
\end_layout

\begin_layout Scrap
notangle -Rlisterrors ${NOWEB_SOURCE} > listerrors
\end_layout

\begin_layout Scrap
chmod +x listerrors
\end_layout

\begin_layout Scrap
@
\end_layout

\begin_layout Section
Indices
\end_layout

\begin_layout Standard
This section provides cross-references into the rest of the program.
\end_layout

\begin_layout Subsection
Macros
\end_layout

\begin_layout Standard
\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
nowebchunks
\end_layout

\end_inset


\end_layout

\begin_layout Subsection
Identifiers
\end_layout

\begin_layout Standard
\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
nowebindex
\end_layout

\end_inset


\end_layout

\end_body
\end_document
