X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSQL%2FTranslator%2FUtils.pm;h=89b26424e695f4e7f9e6505f3bfd454a6188ce1f;hb=da06ac74ada30aacf656943306679a28605ad5c8;hp=88fe399e2300bae725000ee89100e418beae025f;hpb=118bb73f72e2483a02833954d442dbf26f7ac1c7;p=dbsrgits%2FSQL-Translator.git diff --git a/lib/SQL/Translator/Utils.pm b/lib/SQL/Translator/Utils.pm index 88fe399..89b2642 100644 --- a/lib/SQL/Translator/Utils.pm +++ b/lib/SQL/Translator/Utils.pm @@ -1,9 +1,9 @@ package SQL::Translator::Utils; # ---------------------------------------------------------------------- -# $Id: Utils.pm,v 1.4 2003-05-09 16:54:03 kycl4rk Exp $ +# $Id: Utils.pm 1440 2009-01-17 16:31:57Z jawnsy $ # ---------------------------------------------------------------------- -# Copyright (C) 2003 darren chamberlain +# Copyright (C) 2002-2009 SQLFairy Authors # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License as @@ -24,12 +24,14 @@ use strict; use base qw(Exporter); use vars qw($VERSION $DEFAULT_COMMENT @EXPORT_OK); +use Digest::SHA1 qw( sha1_hex ); + use Exporter; -$VERSION = 1.00; +$VERSION = '1.99'; $DEFAULT_COMMENT = '-- '; @EXPORT_OK = qw( - debug normalize_name header_comment parse_list_arg $DEFAULT_COMMENT + debug normalize_name header_comment parse_list_arg truncate_id_uniquely $DEFAULT_COMMENT parse_mysql_version ); # ---------------------------------------------------------------------- @@ -72,7 +74,7 @@ sub debug { # ---------------------------------------------------------------------- sub normalize_name { - my $name = shift; + my $name = shift or return ''; # The name can only begin with a-zA-Z_; if there's anything # else, prefix with _ @@ -116,13 +118,108 @@ HEADER_COMMENT } # ---------------------------------------------------------------------- +# parse_list_arg +# +# Meant to accept a list, an array reference, or a string of +# comma-separated values. Retuns an array reference of the +# arguments. Modified to also handle a list of references. +# ---------------------------------------------------------------------- sub parse_list_arg { - return UNIVERSAL::isa( $_[0], 'ARRAY' ) - ? shift - : [ map { s/^\s+|\s+$//g; $_ } map { split /,/ } @_ ] - ; + my $list = UNIVERSAL::isa( $_[0], 'ARRAY' ) ? shift : [ @_ ]; + + # + # This protects stringification of references. + # + if ( @$list && ref $list->[0] ) { + return $list; + } + # + # This processes string-like arguments. + # + else { + return [ + map { s/^\s+|\s+$//g; $_ } + map { split /,/ } + grep { defined && length } @$list + ]; + } +} + +# ---------------------------------------------------------------------- +# truncate_id_uniquely( $desired_name, $max_symbol_length ) +# +# Truncates the name $desired_name to the $max_symbol_length by +# including part of the hash of the full name at the end of the +# truncated name, giving a high probability that the symbol will be +# unique. +# ---------------------------------------------------------------------- +my $COLLISION_TAG_LENGTH = 8; +sub truncate_id_uniquely { + my ( $desired_name, $max_symbol_length ) = @_; + + return $desired_name unless defined $desired_name && length $desired_name > $max_symbol_length; + + my $truncated_name = substr $desired_name, 0, $max_symbol_length - $COLLISION_TAG_LENGTH - 1; + + # Hex isn't the most space-efficient, but it skirts around allowed + # charset issues + my $digest = sha1_hex($desired_name); + my $collision_tag = substr $digest, 0, $COLLISION_TAG_LENGTH; + + return $truncated_name + . '_' + . $collision_tag; +} + + +#--------------------------------------------------------------------- +# parse_mysql_version ( $version_string, $result_target) +# +# Attempts to parse an arbitrary string as a mysql version number. +# Returns either a floating point perl style string, or a mysql style +# 5 digit string, depending on the supplied $result_target +#--------------------------------------------------------------------- +sub parse_mysql_version { + my ($v, $target) = @_; + + return undef unless $v; + + $target ||= 'perl'; + + my @vers; + + # X.Y.Z style + if ( $v =~ / ^ (\d+) \. (\d{1,3}) (?: \. (\d{1,3}) )? $ /x ) { + push @vers, $1, $2, $3; + } + + # XYYZZ (mysql) style + elsif ( $v =~ / ^ (\d) (\d{2}) (\d{2}) $ /x ) { + push @vers, $1, $2, $3; + } + + # XX.YYYZZZ (perl) style or simply X + elsif ( $v =~ / ^ (\d+) (?: \. (\d{3}) (\d{3}) )? $ /x ) { + push @vers, $1, $2, $3; + } + else { + #how do I croak sanely here? + die "Unparseable MySQL version '$v'"; + } + + if ($target eq 'perl') { + return sprintf ('%d.%03d%03d', map { $_ || 0 } (@vers) ); + } + elsif ($target eq 'mysql') { + return sprintf ('%d%02d%02d', map { $_ || 0 } (@vers) ); + } + else { + #how do I croak sanely here? + die "Unknown version target '$target'"; + } } + 1; # ---------------------------------------------------------------------- @@ -152,7 +249,7 @@ Nothing is exported by default. C takes 0 or more messages, which will be sent to STDERR using C. Occurances of the strings I, I, and I will be replaced by the calling package, subroutine, and line number, -respectively, as reported by C. +respectively, as reported by C. For example, from within C in F, at line 666: @@ -204,17 +301,17 @@ this use). For example, this: use SQL::Translator::Utils qw(header_comment $DEFAULT_COMMENT); print header_comment(__PACKAGE__, - $DEFAULT_COMMENT, + $DEFAULT_COMMENT, "Hi mom!"); produces: - -- + -- -- Created by My::Prodcuer -- Created on Fri Apr 25 06:56:02 2003 - -- + -- -- Hi mom! - -- + -- Note the gratuitous spacing. @@ -230,16 +327,46 @@ All of the following will return equivalent values: parse_list_arg( [ 'id', 'name' ] ); parse_list_arg( qw[ id name ] ); +=head2 truncate_id_uniquely + +Takes a string ($desired_name) and int ($max_symbol_length). Truncates +$desired_name to $max_symbol_length by including part of the hash of +the full name at the end of the truncated name, giving a high +probability that the symbol will be unique. For example, + + truncate_id_uniquely( 'a' x 100, 64 ) + truncate_id_uniquely( 'a' x 99 . 'b', 64 ); + truncate_id_uniquely( 'a' x 99, 64 ) + +Will give three different results; specifically: + + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_7f900025 + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_6191e39a + aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_8cd96af2 + =head2 $DEFAULT_COMMENT This is the default comment string, '-- ' by default. Useful for C. +=head2 parse_mysql_version + +Used by both L and +L in order to provide a +consistent format for both C<< parser_args->{mysql_parser_version} >> and +C<< producer_args->{mysql_version} >> respectively. Takes any of the following +version specifications: + + 5.0.3 + 4.1 + 3.23.2 + 5 + 5.001005 (perl style) + 30201 (mysql style) + =head1 AUTHORS Darren Chamberlain Edarren@cpan.orgE, Ken Y. Clark Ekclark@cpan.orgE. =cut - -=cut