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# -*- perl -*-
# Copyright (C) 1998 Richard Braakman
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
# Functions are defined here to read a shell script and return it as
# a list of tokens.
# We do NOT do history expansion, because it's normally turned off in
# shell scripts.
# Possible tokens:
# literal:
# <<- << >> && || <> >| >& ;; (( <& >& ( ) < > ; & | -
#
# end of line: EOL
use strict;
sub scan_script {
my $tokenval = '';
my @tokens = ();
my $state = 0; #base
my $reserved_ok = 1;
my $line = 1;
foreach (split(/\n/, $_[0])) {
if ($state == 0) { # base
s/^\s+//; # skip leading whitespace
if (m/^\#|^$/) {
# skip blank lines, skip comments till end of line
push(@tokens, 'EOL');
$reserved_ok = 1;
$line++;
next;
}
elsif (s/^( <<- | << | >> | <> | >\| | >& )//x) {
push(@tokens, $1);
$reserved_ok = 0;
redo;
}
elsif (s/^( && | \|\| )//x) {
push(@tokens, $1);
$reserved_ok = 1;
redo;
}
elsif (s/^ ;; //x) {
push(@tokens, ';;');
$state = 1; # case pattern
$reserved_ok = 1;
redo;
}
elsif ($reserved_ok and s/^ \(\( //x) {
push(@tokens, '((');
$state = 2; # dparen arithmetic
redo;
# XXX parse_arith_cmd
}
elsif (s/^( <& | >& )//x) {
push(@tokens, $1);
# hack <& - and >& - cases.
# No comments or newlines can appear between the <& and -.
if (s/^ \s* -//x) {
push(@tokens, '-');
}
$reserved_ok = 0;
redo;
}
elsif (m/^( <\( | >\( )/x) {
$state = 3; # word
$reserved_ok = 0;
redo;
}
elsif (s/^( < | > )//x) {
push (@tokens, $1);
$reserved_ok = 0;
redo;
}
elsif (s/^([();&|])//) {
push (@tokens, $1);
$reserved_ok = 1;
redo;
}
else {
$state = 3; # word
redo;
}
}
}
return @tokens;
}
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