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Hi,

Last night before we came home we write a small script with Jonas that
tries to find German comments in the LibreOffice source code (tracked
files with hxx or cxx extension).

I'm attaching as a patch, I think it may make sense to have it in the
scratch/ directory of build.git.

What do you think about it?

A bit more details:

- It's a python script (for quick prototyping), and it uses the original
  text_cat perl script to guess the language
- It does not use OOo's bundled libtextcat as we want to choose between
  English and German here, not among several languages
- It may still have bugs, though I run it on the startmath module and
  manually checked the result, also I run it on the sw module and did
  read the output at random places and it seems to output no false
  positives at the moment.

A possible future usage is to run the script from cron periodically and
publish the results on some webpage, so that translators don't have to
run it themselves.

Patch attached - is OK to push it? :)

Thanks.
From c4d279ffd089842a728e6d8cbde9f8936d37d4dc Mon Sep 17 00:00:00 2001
From: Miklos Vajna <vmiklos@frugalware.org>
Date: Sat, 23 Oct 2010 18:13:00 +0200
Subject: [PATCH] find-german-comments: simple hack to find german comments in the source code

---
 scratch/german-comments/find-german-comments.py |  162 ++++++++
 scratch/german-comments/t/test.cxx              |   59 +++
 scratch/german-comments/text_cat/COPYING        |  504 +++++++++++++++++++++++
 scratch/german-comments/text_cat/Copyright      |   21 +
 scratch/german-comments/text_cat/LM/english.lm  |  400 ++++++++++++++++++
 scratch/german-comments/text_cat/LM/german.lm   |  400 ++++++++++++++++++
 scratch/german-comments/text_cat/text_cat       |  229 ++++++++++
 scratch/german-comments/text_cat/version        |    2 +
 8 files changed, 1777 insertions(+), 0 deletions(-)
 create mode 100755 scratch/german-comments/find-german-comments.py
 create mode 100644 scratch/german-comments/t/bogus.fxx
 create mode 100644 scratch/german-comments/t/test.cxx
 create mode 100644 scratch/german-comments/text_cat/COPYING
 create mode 100644 scratch/german-comments/text_cat/Copyright
 create mode 100644 scratch/german-comments/text_cat/LM/english.lm
 create mode 100644 scratch/german-comments/text_cat/LM/german.lm
 create mode 100755 scratch/german-comments/text_cat/text_cat
 create mode 100644 scratch/german-comments/text_cat/version

diff --git a/scratch/german-comments/find-german-comments.py 
b/scratch/german-comments/find-german-comments.py
new file mode 100755
index 0000000..1538c6d
--- /dev/null
+++ b/scratch/german-comments/find-german-comments.py
@@ -0,0 +1,162 @@
+#!/usr/bin/env python
+########################################################################
+#
+#  Copyright (c) 2010 Jonas Jensen, Miklos Vajna
+#
+#  Permission is hereby granted, free of charge, to any person
+#  obtaining a copy of this software and associated documentation
+#  files (the "Software"), to deal in the Software without
+#  restriction, including without limitation the rights to use,
+#  copy, modify, merge, publish, distribute, sublicense, and/or sell
+#  copies of the Software, and to permit persons to whom the
+#  Software is furnished to do so, subject to the following
+#  conditions:
+#
+#  The above copyright notice and this permission notice shall be
+#  included in all copies or substantial portions of the Software.
+#
+#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+#  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+#  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+#  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+#  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+#  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+#  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+#  OTHER DEALINGS IN THE SOFTWARE.
+#
+########################################################################
+
+
+import sys, re, subprocess, os, optparse, string
+
+class Parser:
+    """
+    This parser extracts comments from source files, tries to guess
+    their language and then prints out the german ones.
+    """
+    def __init__(self):
+        self.strip = string.punctuation + " \n"
+        op = optparse.OptionParser()
+        op.set_usage("%prog [options] <rootdir>\n\n" +
+            "Searches for german comments in cxx/hxx source files inside a given root\n" +
+            "directory recursively.")
+        op.add_option("-v", "--verbose", action="store_true", dest="verbose", default=False,
+            help="Turn on verbose mode (print progress to stderr)")
+        self.options, args = op.parse_args()
+        try:
+            dir = args[0]
+        except IndexError:
+            dir = "."
+        self.check_source_files(dir)
+
+    def get_comments(self, filename):
+        """
+        Extracts the source code comments.
+        """
+        linenum = 0
+        if self.options.verbose:
+            sys.stderr.write("processing file '%s'...\n" % filename)
+        sock = open(filename)
+        # add an empty line to trigger the output of collected oneliner
+        # comment group
+        lines = sock.readlines() + ["\n"]
+        sock.close()
+
+        in_comment = False
+        buf = []
+        count = 1
+        for i in lines:
+            if "//" in i and not in_comment:
+                # if we find a new //-style comment, then we
+                # just append it to a previous one if: there is
+                # only whitespace before the // mark that is
+                # necessary to make comments longer, giving
+                # more reliable output
+                if not len(re.sub("(.*)//.*", r"\1", i).strip(self.strip)):
+                    s = re.sub(".*// ?", "", i).strip(self.strip)
+                    if len(s):
+                        buf.append(s)
+                else:
+                    # otherwise it's an independent //-style comment in the next line
+                    yield (count, "\n    ".join(buf))
+                    buf = [re.sub(".*// ?", "", i.strip(self.strip))]
+            elif "//" not in i and not in_comment and len(buf) > 0:
+                # first normal line after a // block
+                yield (count, "\n    ".join(buf))
+                buf = []
+            elif "/*" in i and "*/" not in i and not in_comment:
+                # start of a real multiline comment
+                in_comment = True
+                linenum = count
+                s = re.sub(".*/\*+", "", i.strip(self.strip))
+                if len(s):
+                    buf.append(s.strip(self.strip))
+            elif in_comment and not "*/" in i:
+                # in multiline comment
+                s = re.sub("^( |\|)*\*?", "", i)
+                if len(s.strip(self.strip)):
+                    buf.append(s.strip(self.strip))
+            elif "*/" in i and in_comment:
+                # end of multiline comment
+                in_comment = False
+                s = re.sub(r"\*+/.*", "", i.strip(self.strip))
+                if len(s):
+                    buf.append(s)
+                yield (count, "\n    ".join(buf))
+                buf = []
+            elif "/*" in i and "*/" in i:
+                # c-style oneliner comment
+                yield (count, re.sub(".*/\*(.*)\*/.*", r"\1", i).strip(self.strip))
+            count += 1
+
+    def get_lang(self, s):
+        """ the output is 'german' or 'english' or 'german or english'. when
+        unsure, just don't warn, there are strings where you just can't
+        teremine the results reliably, like '#110680#' """
+        cwd = os.getcwd()
+        # change to our directory
+        os.chdir(os.path.split(os.path.abspath(sys.argv[0]))[0])
+        sock = subprocess.Popen(["text_cat/text_cat", "-d", "text_cat/LM"], stdin=subprocess.PIPE, 
stdout=subprocess.PIPE)
+        sock.stdin.write(s)
+        sock.stdin.close()
+        lang = sock.stdout.read().strip()
+        sock.stdout.close()
+        os.chdir(cwd)
+        return lang
+
+    def is_german(self, s):
+        """
+        determines if a string is german or not
+        """
+        # for short strings we can't do reliable recognition, so skip
+        # short strings and less than 4 words
+        s = s.replace('\n', ' ')
+        if len(s) < 32 or len(s.split()) < 4:
+            return False
+        return "german" == self.get_lang(s)
+
+    def check_file(self, path):
+        """
+        checks each comment in a file
+        """
+        for linenum, s in self.get_comments(path):
+            if self.is_german(s):
+                print "%s:%s: %s" % (path, linenum, s)
+
+    def check_source_files(self, dir):
+        """
+        checks each _tracked_ file in a directory recursively
+        """
+        sock = os.popen(r"git ls-files '%s' |egrep '\.(c|h)xx$'" % dir)
+        lines = sock.readlines()
+        sock.close()
+        for path in lines:
+            self.check_file(path.strip())
+
+try:
+    Parser()
+except KeyboardInterrupt:
+    print "Interrupted!"
+    sys.exit(0)
+
+# vim:set shiftwidth=4 softtabstop=4 expandtab:
diff --git a/scratch/german-comments/t/bogus.fxx b/scratch/german-comments/t/bogus.fxx
new file mode 100644
index 0000000..e69de29
diff --git a/scratch/german-comments/t/test.cxx b/scratch/german-comments/t/test.cxx
new file mode 100644
index 0000000..9f0b4eb
--- /dev/null
+++ b/scratch/german-comments/t/test.cxx
@@ -0,0 +1,59 @@
+before_comment();
+foo(); // single line comment
+//single line comment 2
+after_comment();
+
+/*
+ * If there was some unconverted bytes on the last cycle then they
+ */
+
+not_a_comment();
+/*
+ * dann mal einen harten Seitenumbruch einfuegen
+ */
+
+not_a_comment();
+
+/**************************************************************************/
+
+// #110680#
+
+    DEFAULTFONT_SERIF,          // FNT_VARIABLE
+
+// Set base URI
+
+/*************************************************************************
+|*
+|* Deinitialisierung
+|*
+\************************************************************************/
+
+/*************************************************************************
+|*
+|* Deinitialising
+|*
+\************************************************************************/
+
+/* dann mal einen harten Seitenumbruch einfuegen */
+
+    // used to convert the 4 special ExtraProg/UINames for
+    // RES_POOLCOLL_LABEL_DRAWING,  RES_POOLCOLL_LABEL_ABB,
+    // RES_POOLCOLL_LABEL_TABLE, RES_POOLCOLL_LABEL_FRAME
+    // forth and back.
+    // Non-matching names remain unchanged.
+
+        bCntntCheck( FALSE ), // --> FME 2005-05-13 #i43742# <--
+        bInFrontOfLabel( FALSE ), // #i27615#
+        bInNumPortion(FALSE), // #i23726#
+        nInNumPostionOffset(0) // #i23726#
+
+////////////////////////////////////////////////////////////
+//
+//      SmFontPickListBox
+//
+
+// --------------------
+// SwGrfNode
+// --------------------
+
+//#define WID_???                               1024
diff --git a/scratch/german-comments/text_cat/COPYING b/scratch/german-comments/text_cat/COPYING
new file mode 100644
index 0000000..5ab7695
--- /dev/null
+++ b/scratch/german-comments/text_cat/COPYING
@@ -0,0 +1,504 @@
+                 GNU LESSER GENERAL PUBLIC LICENSE
+                      Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+ 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+[This is the first released version of the Lesser GPL.  It also counts
+ as the successor of the GNU Library Public License, version 2, hence
+ the version number 2.1.]
+
+                           Preamble
+
+  The licenses for most software are designed to take away your
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+specially designated software packages--typically libraries--of the
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+can use it too, but we suggest you first think carefully about whether
+this license or the ordinary General Public License is the better
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+
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+  It may happen that this requirement contradicts the license
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+
+  7. You may place library facilities that are a work based on the
+Library side-by-side in a single library together with other library
+facilities not covered by this License, and distribute such a combined
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+  9. You are not required to accept this License, since you have not
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+
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+
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+DAMAGES.
+
+                    END OF TERMS AND CONDITIONS
+
+           How to Apply These Terms to Your New Libraries
+
+  If you develop a new library, and you want it to be of the greatest
+possible use to the public, we recommend making it free software that
+everyone can redistribute and change.  You can do so by permitting
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+
+  To apply these terms, attach the following notices to the library.  It is
+safest to attach them to the start of each source file to most effectively
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+
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+    Copyright (C) <year>  <name of author>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+Also add information on how to contact you by electronic and paper mail.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the library, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the
+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!
+
+
diff --git a/scratch/german-comments/text_cat/Copyright b/scratch/german-comments/text_cat/Copyright
new file mode 100644
index 0000000..c1e75d3
--- /dev/null
+++ b/scratch/german-comments/text_cat/Copyright
@@ -0,0 +1,21 @@
+Copyright (c) 1994, 1995, 1996, 1997 by Gertjan van Noord.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the 
+    Free Software Foundation, Inc., 
+    51 Franklin Street, Fifth Floor, Boston, 
+    MA  02110-1301  USA
+
+cf. the file COPYING
+
+
diff --git a/scratch/german-comments/text_cat/LM/english.lm 
b/scratch/german-comments/text_cat/LM/english.lm
new file mode 100644
index 0000000..ab71632
--- /dev/null
+++ b/scratch/german-comments/text_cat/LM/english.lm
@@ -0,0 +1,400 @@
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diff --git a/scratch/german-comments/text_cat/LM/german.lm 
b/scratch/german-comments/text_cat/LM/german.lm
new file mode 100644
index 0000000..6f14f51
--- /dev/null
+++ b/scratch/german-comments/text_cat/LM/german.lm
@@ -0,0 +1,400 @@
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+sa      141
+_fü     140
+hn      140
+zi      140
+no      140
+nicht   140
+im_     139
+von_    139
+von     139
+_nic    139
+_nich   139
+eine_   139
+oc      138
+wei     138
+io      138
+schen   138
+gt      138
diff --git a/scratch/german-comments/text_cat/text_cat b/scratch/german-comments/text_cat/text_cat
new file mode 100755
index 0000000..6c6b0d1
--- /dev/null
+++ b/scratch/german-comments/text_cat/text_cat
@@ -0,0 +1,229 @@
+#!/usr/bin/perl -w
+# Š Gertjan van Noord, 1997.
+# mailto:vannoord@let.rug.nl
+
+use strict;
+use vars qw($opt_d $opt_f $opt_h $opt_i $opt_l $opt_n $opt_s $opt_t $opt_v $opt_u $opt_a);
+use Getopt::Std;
+use Benchmark;
+
+my $non_word_characters='0-9\s';
+
+# OPTIONS
+getopts('a:d:f:hi:lnst:u:v');
+
+# defaults: set $opt_X unless already defined (Perl Cookbook p. 6):
+$opt_a ||= 10;
+$opt_d ||= '/users1/vannoord/Perl/TextCat/LM';
+$opt_f ||= 0;
+$opt_t ||= 400;
+$opt_u ||= 1.05;
+
+sub help {
+    print <<HELP
+Text Categorization. Typically used to determine the language of a
+given document. 
+
+Usage
+-----
+
+* print help message:
+
+$0 -h
+
+* for guessing: 
+
+$0 [-a Int] [-d Dir] [-f Int] [-i N] [-l] [-t Int] [-u Int] [-v]
+
+    -a    the program returns the best-scoring language together
+          with all languages which are $opt_u times worse (cf option -u). 
+          If the number of languages to be printed is larger than the value 
+          of this option (default: $opt_a) then no language is returned, but
+          instead a message that the input is of an unknown language is
+          printed. Default: $opt_a.
+    -d    indicates in which directory the language models are 
+          located (files ending in .lm). Currently only a single 
+          directory is supported. Default: $opt_d.
+    -f    Before sorting is performed the Ngrams which occur this number 
+          of times or less are removed. This can be used to speed up
+          the program for longer inputs. For short inputs you should use
+          -f 0.
+          Default: $opt_f.
+    -i N  only read first N lines
+    -l    indicates that input is given as an argument on the command line,
+          e.g. text_cat -l "this is english text"
+          Cannot be used in combination with -n.
+    -s    Determine language of each line of input. Not very efficient yet,
+          because language models are re-loaded after each line.
+    -t    indicates the topmost number of ngrams that should be used. 
+          If used in combination with -n this determines the size of the 
+          output. If used with categorization this determines
+          the number of ngrams that are compared with each of the language
+          models (but each of those models is used completely). 
+    -u    determines how much worse result must be in order not to be 
+          mentioned as an alternative. Typical value: 1.05 or 1.1. 
+          Default: $opt_u.
+    -v    verbose. Continuation messages are written to standard error.
+
+* for creating new language model, based on text read from standard input:
+
+$0 -n [-v]
+
+    -v    verbose. Continuation messages are written to standard error.
+
+
+HELP
+}
+
+if ($opt_h) { help(); exit 0; };
+
+if ($opt_n) { 
+    my %ngram=();
+    my @result = create_lm(input(),\%ngram);
+    print join("\n",map { "$_\t $ngram{$_}" ; } @result),"\n";
+} elsif ($opt_l) {
+    classify($ARGV[0]);
+} elsif ($opt_s) {
+    while (<>) {
+       chomp;
+       classify($_);
+    }
+} else { 
+    classify(input()); 
+}
+
+# CLASSIFICATION
+sub classify {
+  my ($input)=@_;
+  my %results=();
+  my $maxp = $opt_t;
+  # open directory to find which languages are supported
+  opendir DIR, "$opt_d" or die "directory $opt_d: $!\n";
+  my @languages = sort(grep { s/\.lm// && -r "$opt_d/$_.lm" } readdir(DIR));
+  closedir DIR;
+  @languages or die "sorry, can't read any language models from $opt_d\n" .
+    "language models must reside in files with .lm ending\n";
+
+
+  # create ngrams for input. Note that hash %unknown is not used;
+  # it contains the actual counts which are only used under -n: creating
+  # new language model (and even then they are not really required).
+  my @unknown=create_lm($input);
+  # load model and count for each language.
+  my $language;
+  my $t1 = new Benchmark;
+  foreach $language (@languages) {
+    # loads the language model into hash %$language.
+    my %ngram=();
+    my $rang=1;
+    open(LM,"$opt_d/$language.lm") || die "cannot open $language.lm: $!\n";
+    while (<LM>) {
+      chomp;
+      # only use lines starting with appropriate character. Others are
+      # ignored.
+      if (/^[^$non_word_characters]+/o) {
+       $ngram{$&} = $rang++;
+      } 
+    }
+    close(LM);
+    #print STDERR "loaded language model $language\n" if $opt_v;
+    
+    # compares the language model with input ngrams list
+    my ($i,$p)=(0,0);
+    while ($i < @unknown) {
+      if ($ngram{$unknown[$i]}) {
+       $p=$p+abs($ngram{$unknown[$i]}-$i);
+      } else { 
+       $p=$p+$maxp; 
+      }
+      ++$i;
+    }
+    #print STDERR "$language: $p\n" if $opt_v;
+    
+    $results{$language} = $p;
+  }
+  print STDERR "read language models done (" . 
+    timestr(timediff(new Benchmark, $t1)) . 
+      ".\n" if $opt_v;
+  my @results = sort { $results{$a} <=> $results{$b} } keys %results;
+  
+  print join("\n",map { "$_\t $results{$_}"; } @results),"\n" if $opt_v;
+  my $a = $results{$results[0]};
+  
+  my @answers=(shift(@results));
+  while (@results && $results{$results[0]} < ($opt_u *$a)) {
+    @answers=(@answers,shift(@results));
+  }
+  if (@answers > $opt_a) {
+    print "I don't know; " .
+      "Perhaps this is a language I haven't seen before?\n";
+  } else {
+    print join(" or ", @answers), "\n";
+  }
+}
+
+# first and only argument is reference to hash.
+# this hash is filled, and a sorted list (opt_n elements)
+# is returned.
+sub input {
+    my $read="";
+    if ($opt_i) {
+       while(<>) {
+           if ($. == $opt_i) {
+               return $read . $_;
+           }
+           $read = $read . $_;
+       }
+       return $read;
+    } else {
+       local $/;     # so it doesn't affect $/ elsewhere
+       undef $/;
+       $read = <>;      # swallow input.
+       $read || die "determining the language of an empty file is hard...\n";
+       return $read;
+    }
+}
+
+
+sub create_lm {
+  my $t1 = new Benchmark;
+  my $ngram;
+  ($_,$ngram) = @_;  #$ngram contains reference to the hash we build
+    # then add the ngrams found in each word in the hash
+  my $word;
+  foreach $word (split("[$non_word_characters]+")) {
+    $word = "_" . $word . "_";
+    my $len = length($word);
+    my $flen=$len;
+    my $i;
+    for ($i=0;$i<$flen;$i++) {
+      $$ngram{substr($word,$i,5)}++ if $len > 4;
+      $$ngram{substr($word,$i,4)}++ if $len > 3;
+      $$ngram{substr($word,$i,3)}++ if $len > 2;
+      $$ngram{substr($word,$i,2)}++ if $len > 1;
+      $$ngram{substr($word,$i,1)}++;
+      $len--;
+    }
+  }
+  ###print "@{[%$ngram]}";
+  my $t2 = new Benchmark;
+  print STDERR "count_ngrams done (". 
+    timestr(timediff($t2, $t1)) .").\n" if $opt_v;
+
+  # as suggested by Karel P. de Vos, k.vos@elsevier.nl, we speed up
+  # sorting by removing singletons
+  map { my $key=$_; if ($$ngram{$key} <= $opt_f) 
+             { delete $$ngram{$key}; }; } keys %$ngram;
+  #however I have very bad results for short inputs, this way
+
+  
+  # sort the ngrams, and spit out the $opt_t frequent ones.
+  # adding  `or $a cmp $b' in the sort block makes sorting five
+  # times slower..., although it would be somewhat nicer (unique result)
+  my @sorted = sort { $$ngram{$b} <=> $$ngram{$a} } keys %$ngram;
+  splice(@sorted,$opt_t) if (@sorted > $opt_t); 
+  print STDERR "sorting done (" . 
+    timestr(timediff(new Benchmark, $t2)) . 
+      ").\n" if $opt_v;
+  return @sorted;
+}
diff --git a/scratch/german-comments/text_cat/version b/scratch/german-comments/text_cat/version
new file mode 100644
index 0000000..e6ba9d5
--- /dev/null
+++ b/scratch/german-comments/text_cat/version
@@ -0,0 +1,2 @@
+1.10
+
-- 
1.7.3.1

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