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# Subject: [stolfi@ic.unicamp.br: Bug in [...]* matching with acute-u]
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# From: Jorge Stolfi <stolfi@ic.unicamp.br>
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# Subject: Bug in [...]* matching with acute-u
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# Hi,
#
# I think I have run into a bug in gawk's handling of REs of the
# form [...]* when the bracketed list includes certain 8-bit characters,
# specifically u-acute (octal \372).
#
# The problem occurs in GNU Awk 3.0.4, both under
# Linux 2.2.14-5.0 (intel i686) and SunOS 5.5 (Sun sparc).
#
# Here is a program that illustrates the bug, and its output.
# The first two lines of the output should be equal, shouldn't they?
#
# ----------------------------------------------------------------------
#! /usr/bin/gawk -f

BEGIN {
  s = "bananas and ananases in canaan";
  t = s; gsub(/[an]*n/, "AN", t);   printf "%-8s  %s\n", "[an]*n", t;
  t = s; gsub(/[an�]*n/, "AN", t);  printf "%-8s  %s\n", "[an�]*n", t;
  print "";
  t = s; gsub(/[a�]*n/, "AN", t);   printf "%-8s  %s\n", "[a�]*n", t;
  print "";
  t = s; gsub(/[an]n/, "AN", t);    printf "%-8s  %s\n", "[an]n", t;
  t = s; gsub(/[a�]n/, "AN", t);    printf "%-8s  %s\n", "[a�]n", t;
  t = s; gsub(/[an�]n/, "AN", t);   printf "%-8s  %s\n", "[an�]n", t;
  print "";
  t = s; gsub(/[an]?n/, "AN", t);   printf "%-8s  %s\n", "[an]?n", t;
  t = s; gsub(/[a�]?n/, "AN", t);   printf "%-8s  %s\n", "[a�]?n", t;
  t = s; gsub(/[an�]?n/, "AN", t);  printf "%-8s  %s\n", "[an�]?n", t;
  print "";
  t = s; gsub(/[an]+n/, "AN", t);   printf "%-8s  %s\n", "[an]+n", t;
  t = s; gsub(/[a�]+n/,  "AN", t);  printf "%-8s  %s\n", "[a�]+n", t;
  t = s; gsub(/[an�]+n/, "AN", t);  printf "%-8s  %s\n", "[an�]+n", t;
}
# ----------------------------------------------------------------------
# [an]*n    bANas ANd ANases iAN cAN
# [an�]*n   bananas and ananases in canaan
#
# [a�]*n    bANANas ANd ANANases iAN cANAN
#
# [an]n     bANANas ANd ANANases in cANaAN
# [a�]n     bANANas ANd ANANases in cANaAN
# [an�]n    bANANas ANd ANANases in cANaAN
#
# [an]?n    bANANas ANd ANANases iAN cANaAN
# [a�]?n    bANANas ANd ANANases iAN cANaAN
# [an�]?n   bANANas ANd ANANases iAN cANaAN
#
# [an]+n    bANas ANd ANases in cAN
# [a�]+n    bANANas ANd ANANases in cANAN
# [an�]+n   bananas and ananases in canaan
# ----------------------------------------------------------------------
#
# Apparently the problem is specific to u-acute; I've tried several
# other 8-bit characters and they seem to behave as expected.
#
# By comparing the second and third output lines, it would seem that the
# problem involves backtracking out of a partial match of [...]* in
# order to match the next sub-expression, when the latter begins with
# one of the given characters.
#
#
# All the best,
#
# --stolfi
#
# ------------------------------------------------------------------------
# Jorge Stolfi | http://www.dcc.unicamp.br/~stolfi | stolfi@dcc.unicamp.br
# Institute of Computing (formerly DCC-IMECC)      | Wrk +55 (19)3788-5858
# Universidade Estadual de Campinas (UNICAMP)      |     +55 (19)3788-5840
# Av. Albert Einstein 1251 - Caixa Postal 6176     | Fax +55 (19)3788-5847
# 13083-970 Campinas, SP -- Brazil                 | Hom +55 (19)3287-4069
# ------------------------------------------------------------------------
#
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