1 package SQL::Translator::Utils;
3 # ----------------------------------------------------------------------
4 # $Id: Utils.pm,v 1.3 2003-04-25 11:44:20 dlc Exp $
5 # ----------------------------------------------------------------------
6 # Copyright (C) 2003 darren chamberlain <darren@cpan.org>
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License as
10 # published by the Free Software Foundation; version 2.
12 # This program is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 # General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 # -------------------------------------------------------------------
24 use base qw(Exporter);
25 use vars qw($VERSION $DEFAULT_COMMENT @EXPORT_OK);
30 $DEFAULT_COMMENT = '-- ';
31 @EXPORT_OK = qw(debug normalize_name header_comment $DEFAULT_COMMENT);
33 # ----------------------------------------------------------------------
36 # Will send debugging messages to STDERR, if the caller's $DEBUG global
39 # This debug() function has a neat feature: Occurances of the strings
40 # PKG, LINE, and SUB in each message will be replaced with elements
43 # debug("PKG: Bad things happened on line LINE!");
47 # [SQL::Translator: Bad things happened on line 643]
49 # If called from Translator.pm, on line 643.
50 # ----------------------------------------------------------------------
52 my ($pkg, $file, $line, $sub) = caller(0);
55 return unless ${"$pkg\::DEBUG"};
63 $x =~ s/\bPKG\b/$pkg/g;
64 $x =~ s/\bLINE\b/$line/g;
65 $x =~ s/\bSUB\b/$sub/g;
66 #warn '[' . $x . "]\n";
67 print STDERR '[' . $x . "]\n";
75 # The name can only begin with a-zA-Z_; if there's anything
77 $name =~ s/^([^a-zA-Z_])/_$1/;
79 # anything other than a-zA-Z0-9_ in the non-first position
80 # needs to be turned into _
81 $name =~ tr/[a-zA-Z0-9_]/_/c;
83 # All duplicated _ need to be squashed into one.
93 my $producer = shift || caller;
94 my $comment_char = shift;
95 my $now = scalar localtime;
97 $comment_char = $DEFAULT_COMMENT
98 unless defined $comment_char;
100 my $header_comment =<<"HEADER_COMMENT";
102 ${comment_char}Created by $producer
103 ${comment_char}Created on $now
107 # Any additional stuff passed in
108 for my $additional_comment (@_) {
109 $header_comment .= "${comment_char}${additional_comment}\n";
112 return $header_comment;
121 SQL::Translator::Utils - SQL::Translator Utility functions
125 use SQL::Translator::Utils qw(debug);
126 debug("PKG: Bad things happened");
130 C<SQL::Translator::Utils> contains utility functions designed to be
131 used from the other modules within the C<SQL::Translator> modules.
133 Nothing is exported by default.
135 =head1 EXPORTED FUNCTIONS AND CONSTANTS
139 C<debug> takes 0 or more messages, which will be sent to STDERR using
140 C<warn>. Occurances of the strings I<PKG>, I<SUB>, and I<LINE>
141 will be replaced by the calling package, subroutine, and line number,
142 respectively, as reported by C<caller(1)>.
144 For example, from within C<foo> in F<SQL/Translator.pm>, at line 666:
146 debug("PKG: Error reading file at SUB/LINE");
150 [SQL::Translator: Error reading file at foo/666]
152 The entire message is enclosed within C<[> and C<]> for visual clarity
153 when STDERR is intermixed with STDOUT.
155 =head2 normalize_name
157 C<normalize_name> takes a string and ensures that it is suitable for
158 use as an identifier. This means: ensure that it starts with a letter
159 or underscore, and that the rest of the string consists of only
160 letters, numbers, and underscores. A string that begins with
161 something other than [a-zA-Z] will be prefixer with an underscore, and
162 all other characters in the string will be replaced with underscores.
163 Finally, a trailing underscore will be removed, because that's ugly.
165 normalize_name("Hello, world");
171 A more useful example, from the C<SQL::Translator::Parser::Excel> test
174 normalize_name("silly field (with random characters)");
178 silly_field_with_random_characters
180 =head2 header_comment
182 Create the header comment. Takes 1 mandatory argument (the producer
183 classname), an optional comment character (defaults to $DEFAULT_COMMENT),
184 and 0 or more additional comments, which will be appended to the header,
185 prefixed with the comment character. If additional comments are provided,
186 then a comment string must be provided ($DEFAULT_COMMENT is exported for
187 this use). For example, this:
189 package My::Producer;
191 use SQL::Translator::Utils qw(header_comment $DEFAULT_COMMENT);
193 print header_comment(__PACKAGE__,
200 -- Created by My::Prodcuer
201 -- Created on Fri Apr 25 06:56:02 2003
206 Note the gratuitous spacing.
208 =head2 $DEFAULT_COMMENT
210 This is the default comment string, '-- ' by default. Useful for