package SQL::Translator;
-#-----------------------------------------------------
-# $Id: Translator.pm,v 1.1.1.1 2002-03-01 02:26:25 kycl4rk Exp $
+# ----------------------------------------------------------------------
+# $Id: Translator.pm,v 1.14 2002-11-26 03:59:57 kycl4rk Exp $
+# ----------------------------------------------------------------------
+# Copyright (C) 2002 Ken Y. Clark <kclark@cpan.org>,
+# darren chamberlain <darren@cpan.org>
#
-# File : SQL/Translator.pm
-# Programmer : Ken Y. Clark, kclark@logsoft.com
-# Created : 2002/02/27
-# Purpose : convert schema from one database to another
-#-----------------------------------------------------
+# 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; version 2.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307 USA
+# -------------------------------------------------------------------
+
+=head1 NAME
+
+SQL::Translator - convert schema from one database to another
+
+=head1 SYNOPSIS
+
+ use SQL::Translator;
+
+ my $translator = SQL::Translator->new(
+ xlate => $xlate || {}, # Overrides for field translation
+ debug => $debug, # Print debug info
+ trace => $trace, # Print Parse::RecDescent trace
+ no_comments => $no_comments, # Don't include comments in output
+ show_warnings => $show_warnings, # Print name mutations, conflicts
+ add_drop_table => $add_drop_table, # Add "drop table" statements
+ );
+
+ my $output = $translator->translate(
+ from => "MySQL",
+ to => "Oracle",
+ filename => $file,
+ ) or die $translator->error;
+
+ print $output;
+
+=head1 DESCRIPTION
+
+This module attempts to simplify the task of converting one database
+create syntax to another through the use of Parsers (which understand
+the sourced format) and Producers (which understand the destination
+format). The idea is that any Parser can be used with any Producer in
+the conversion process. So, if you wanted PostgreSQL-to-Oracle, you
+would use the PostgreSQL parser and the Oracle producer.
+
+=cut
use strict;
-use vars qw( $VERSION );
-$VERSION = (qw$Revision: 1.1.1.1 $)[-1];
+use vars qw( $VERSION $REVISION $DEFAULT_SUB $DEBUG $ERROR );
+use base 'Class::Base';
-use Data::Dumper;
+$VERSION = '0.01';
+$REVISION = sprintf "%d.%02d", q$Revision: 1.14 $ =~ /(\d+)\.(\d+)/;
+$DEBUG = 0 unless defined $DEBUG;
+$ERROR = "";
-use SQL::Translator::Parser::MySQL;
-use SQL::Translator::Parser::Sybase;
-use SQL::Translator::Producer::Oracle;
-use SQL::Translator::Producer::XML;
+use Carp qw(carp);
-#
-# These are the inputs we can parse.
-#
-my %parsers = (
- mysql => 'MySQL',
- sybase => 'Sybase',
-);
+use File::Spec::Functions qw(catfile);
+use File::Basename qw(dirname);
+use IO::Dir;
-#
-# These are the formats we can produce.
-#
-my %producers = (
- oracle => 'Oracle',
- xml => 'XML',
-);
+# ----------------------------------------------------------------------
+# The default behavior is to "pass through" values (note that the
+# SQL::Translator instance is the first value ($_[0]), and the stuff
+# to be parsed is the second value ($_[1])
+# ----------------------------------------------------------------------
+$DEFAULT_SUB = sub { $_[1] } unless defined $DEFAULT_SUB;
-#-----------------------------------------------------
-sub new {
+=head1 CONSTRUCTOR
+
+The constructor is called B<new>, and accepts a optional hash of options.
+Valid options are:
+
+=over 4
+
+=item parser (aka from)
+
+=item parser_args
+
+=item producer (aka to)
+
+=item producer_args
+
+=item filename (aka file)
+
+=item data
+
+=item debug
+
+=back
+
+All options are, well, optional; these attributes can be set via
+instance methods. Internally, they are; no (non-syntactical)
+advantage is gained by passing options to the constructor.
+
+=cut
+
+# ----------------------------------------------------------------------
+# init([ARGS])
+# The constructor.
#
-# Makes a new object. Intentionally made very bare as
-# it is used by all subclasses (unless they override,
-# of course).
+# new takes an optional hash of arguments. These arguments may
+# include a parser, specified with the keys "parser" or "from",
+# and a producer, specified with the keys "producer" or "to".
#
- my $class = shift;
- my %args = @_;
- my $self = { %args };
- return bless $self, $class;
+# The values that can be passed as the parser or producer are
+# given directly to the parser or producer methods, respectively.
+# See the appropriate method description below for details about
+# what each expects/accepts.
+# ----------------------------------------------------------------------
+sub init {
+ my ( $self, $config ) = @_;
+
+ #
+ # Set the parser and producer.
+ #
+ # If a 'parser' or 'from' parameter is passed in, use that as the
+ # parser; if a 'producer' or 'to' parameter is passed in, use that
+ # as the producer; both default to $DEFAULT_SUB.
+ #
+ $self->parser ($config->{'parser'} || $config->{'from'} || $DEFAULT_SUB);
+ $self->producer($config->{'producer'} || $config->{'to'} || $DEFAULT_SUB);
+
+ #
+ # Set the parser_args and producer_args
+ #
+ for my $pargs ( qw[ parser_args producer_args ] ) {
+ $self->$pargs( $config->{$pargs} ) if defined $config->{ $pargs };
+ }
+
+ #
+ # Set the data source, if 'filename' or 'file' is provided.
+ #
+ $config->{'filename'} ||= $config->{'file'} || "";
+ $self->filename( $config->{'filename'} ) if $config->{'filename'};
+
+ #
+ # Finally, if there is a 'data' parameter, use that in
+ # preference to filename and file
+ #
+ if ( my $data = $config->{'data'} ) {
+ $self->data( $data );
+ }
+
+ #
+ # Set various other options.
+ #
+ $self->{'debug'} = defined $config->{'debug'} ? $config->{'debug'} : $DEBUG;
+
+
+ $self->add_drop_table( $config->{'add_drop_table'} );
+
+ $self->custom_translate( $config->{'xlate'} );
+
+ $self->no_comments( $config->{'no_comments'} );
+
+ $self->show_warnings( $config->{'show_warnings'} );
+
+ $self->trace( $config->{'trace'} );
+
+ return $self;
}
-#-----------------------------------------------------
-sub error {
-#
-# Return the last error.
-#
- return shift()->{'error'} || '';
+=head1 METHODS
+
+# ----------------------------------------------------------------------
+=head2 B<add_drop_table>
+
+Toggles whether or not to add "DROP TABLE" statements just before the
+create definitions.
+
+=cut
+
+sub add_drop_table {
+ my $self = shift;
+ if ( defined (my $arg = shift) ) {
+ $self->{'add_drop_table'} = $arg ? 1 : 0;
+ }
+ return $self->{'add_drop_table'} || 0;
}
-#-----------------------------------------------------
-sub error_out {
-#
-# Record the error and return undef.
-#
+
+# ----------------------------------------------------------------------
+=head2 B<custom_translate>
+
+Allows the user to override default translation of fields. For example,
+if a MySQL "text" field would normally be converted to a "long" for Oracle,
+the user could specify to change it to a "CLOB." Accepts a hashref where
+keys are the "from" value and values are the "to," returns the current
+value of the field.
+
+=cut
+
+sub custom_translate {
+ my $self = shift;
+ $self->{'custom_translate'} = shift if @_;
+ return $self->{'custom_translate'} || {};
+}
+
+# ----------------------------------------------------------------------
+=head2 B<no_comments>
+
+Toggles whether to print comments in the output. Accepts a true or false
+value, returns the current value.
+
+=cut
+
+sub no_comments {
my $self = shift;
- if ( my $error = shift ) {
- $self->{'error'} = $error;
+ my $arg = shift;
+ if ( defined $arg ) {
+ $self->{'no_comments'} = $arg ? 1 : 0;
}
- return;
+ return $self->{'no_comments'} || 0;
}
-#-----------------------------------------------------
-sub translate {
+# ----------------------------------------------------------------------
+=head2 B<producer>
+
+The B<producer> method is an accessor/mutator, used to retrieve or
+define what subroutine is called to produce the output. A subroutine
+defined as a producer will be invoked as a function (not a method) and
+passed 2 parameters: its container SQL::Translator instance and a
+data structure. It is expected that the function transform the data
+structure to a string. The SQL::Transformer instance is provided for
+informational purposes; for example, the type of the parser can be
+retrieved using the B<parser_type> method, and the B<error> and
+B<debug> methods can be called when needed.
+
+When defining a producer, one of several things can be passed
+in: A module name (e.g., My::Groovy::Producer), a module name
+relative to the SQL::Translator::Producer namespace (e.g., MySQL), a
+module name and function combination (My::Groovy::Producer::transmogrify),
+or a reference to an anonymous subroutine. If a full module name is
+passed in (for the purposes of this method, a string containing "::"
+is considered to be a module name), it is treated as a package, and a
+function called "produce" will be invoked: $modulename::produce. If
+$modulename cannot be loaded, the final portion is stripped off and
+treated as a function. In other words, if there is no file named
+My/Groovy/Producer/transmogrify.pm, SQL::Translator will attempt to load
+My/Groovy/Producer.pm and use transmogrify as the name of the function,
+instead of the default "produce".
+
+ my $tr = SQL::Translator->new;
+
+ # This will invoke My::Groovy::Producer::produce($tr, $data)
+ $tr->producer("My::Groovy::Producer");
+
+ # This will invoke SQL::Translator::Producer::Sybase::produce($tr, $data)
+ $tr->producer("Sybase");
+
+ # This will invoke My::Groovy::Producer::transmogrify($tr, $data),
+ # assuming that My::Groovy::Producer::transmogrify is not a module
+ # on disk.
+ $tr->producer("My::Groovy::Producer::transmogrify");
+
+ # This will invoke the referenced subroutine directly, as
+ # $subref->($tr, $data);
+ $tr->producer(\&my_producer);
+
+There is also a method named B<producer_type>, which is a string
+containing the classname to which the above B<produce> function
+belongs. In the case of anonymous subroutines, this method returns
+the string "CODE".
+
+Finally, there is a method named B<producer_args>, which is both an
+accessor and a mutator. Arbitrary data may be stored in name => value
+pairs for the producer subroutine to access:
+
+ sub My::Random::producer {
+ my ($tr, $data) = @_;
+ my $pr_args = $tr->producer_args();
+
+ # $pr_args is a hashref.
+
+Extra data passed to the B<producer> method is passed to
+B<producer_args>:
+
+ $tr->producer("xSV", delimiter => ',\s*');
+
+ # In SQL::Translator::Producer::xSV:
+ my $args = $tr->producer_args;
+ my $delimiter = $args->{'delimiter'}; # value is ,\s*
+
+=cut
+
+# producer and producer_type
+sub producer {
+ my $self = shift;
+
+ # producer as a mutator
+ if (@_) {
+ my $producer = shift;
+
+ # Passed a module name (string containing "::")
+ if ($producer =~ /::/) {
+ my $func_name;
+
+ # Module name was passed directly
+ # We try to load the name; if it doesn't load, there's
+ # a possibility that it has a function name attached to
+ # it.
+ if (load($producer)) {
+ $func_name = "produce";
+ }
+
+ # Module::function was passed
+ else {
+ # Passed Module::Name::function; try to recover
+ my @func_parts = split /::/, $producer;
+ $func_name = pop @func_parts;
+ $producer = join "::", @func_parts;
+
+ # If this doesn't work, then we have a legitimate
+ # problem.
+ load($producer) or die "Can't load $producer: $@";
+ }
+
+ # get code reference and assign
+ $self->{'producer'} = \&{ "$producer\::$func_name" };
+ $self->{'producer_type'} = $producer;
+ $self->debug("Got producer: $producer\::$func_name\n");
+ }
+
+ # passed an anonymous subroutine reference
+ elsif (isa($producer, 'CODE')) {
+ $self->{'producer'} = $producer;
+ $self->{'producer_type'} = "CODE";
+ $self->debug("Got producer: code ref\n");
+ }
+
+ # passed a string containing no "::"; relative package name
+ else {
+ my $Pp = sprintf "SQL::Translator::Producer::$producer";
+ load($Pp) or die "Can't load $Pp: $@";
+ $self->{'producer'} = \&{ "$Pp\::produce" };
+ $self->{'producer_type'} = $Pp;
+ $self->debug("Got producer: $Pp\n");
+ }
+
+ # At this point, $self->{'producer'} contains a subroutine
+ # reference that is ready to run
+
+ # Anything left? If so, it's producer_args
+ $self->producer_args(@_) if (@_);
+ }
+
+ return $self->{'producer'};
+};
+
+# ----------------------------------------------------------------------
+# producer_type
#
-# Translates any number of given files.
+# producer_type is an accessor that allows producer subs to get
+# information about their origin. This is poptentially important;
+# since all producer subs are called as subroutine refernces, there is
+# no way for a producer to find out which package the sub lives in
+# originally, for example.
+# ----------------------------------------------------------------------
+sub producer_type { $_[0]->{'producer_type'} }
+
+# ----------------------------------------------------------------------
+# producer_args
+#
+# Arbitrary name => value pairs of paramters can be passed to a
+# producer using this method.
#
- my ( $self, %args ) = @_;
- my $from = $args{'from'} || '';
- my $to = $args{'to'} || '';
- my $input = $args{'input'} || [];
- my $verbose = $args{'verbose'} || 0;
- my $no_comments = $args{'no_comments'} || 0;
+# XXX All calls to producer_args with a value clobbers old values!
+# Should probably check if $_[0] is undef, and delete stored
+# args if it is:
+#
+# if (@_) {
+# unless (defined $_[0]) {
+# %{ $self->{'producer_args'} } = ();
+# }
+# my $args = isa($_[0], 'HASH') ? shift : { @_ };
+# %{ $self->{'producer_args'} } = (
+# %{ $self->{'producer_args'} },
+# %{ $args }
+# );
+# }
+# ----------------------------------------------------------------------
+sub producer_args {
+ my $self = shift;
+ if (@_) {
+ my $args = isa($_[0], 'HASH') ? shift : { @_ };
+ $self->{'producer_args'} = $args;
+ }
+ $self->{'producer_args'};
+}
+
+# ----------------------------------------------------------------------
+=head2 B<parser>
+
+The B<parser> method defines or retrieves a subroutine that will be
+called to perform the parsing. The basic idea is the same as that of
+B<producer> (see above), except the default subroutine name is
+"parse", and will be invoked as $module_name::parse($tr, $data).
+Also, the parser subroutine will be passed a string containing the
+entirety of the data to be parsed.
+
+ # Invokes SQL::Translator::Parser::MySQL::parse()
+ $tr->parser("MySQL");
+
+ # Invokes My::Groovy::Parser::parse()
+ $tr->parser("My::Groovy::Parser");
+
+ # Invoke an anonymous subroutine directly
+ $tr->parser(sub {
+ my $dumper = Data::Dumper->new([ $_[1] ], [ "SQL" ]);
+ $dumper->Purity(1)->Terse(1)->Deepcopy(1);
+ return $dumper->Dump;
+ });
+
+There is also B<parser_type> and B<parser_args>, which perform
+analogously to B<producer_type> and B<producer_args>
+
+=cut
+
+sub parser {
+ my $self = shift;
+
+ # parser as a mutator
+ if (@_) {
+ my $parser = shift;
+
+ # Passed a module name (string containing "::")
+ if ($parser =~ /::/) {
+ my $func_name;
+
+ # Module name was passed directly
+ # We try to load the name; if it doesn't load, there's
+ # a possibility that it has a function name attached to
+ # it.
+ if (load($parser)) {
+ $func_name = "parse";
+ }
+
+ # Module::function was passed
+ else {
+ # Passed Module::Name::function; try to recover
+ my @func_parts = split /::/, $parser;
+ $func_name = pop @func_parts;
+ $parser = join "::", @func_parts;
- if ( exists $parsers{ $from } ) {
- $self->{'from'} = $from;
- warn "Using parser '$from.'\n" if $verbose;
+ # If this doesn't work, then we have a legitimate
+ # problem.
+ load($parser) or die "Can't load $parser: $@";
+ }
+
+ # get code reference and assign
+ $self->{'parser'} = \&{ "$parser\::$func_name" };
+ $self->{'parser_type'} = $parser;
+ $self->debug("Got parser: $parser\::$func_name\n");
+ }
+
+ # passed an anonymous subroutine reference
+ elsif ( isa( $parser, 'CODE' ) ) {
+ $self->{'parser'} = $parser;
+ $self->{'parser_type'} = "CODE";
+ $self->debug("Got parser: code ref\n");
+ }
+
+ # passed a string containing no "::"; relative package name
+ else {
+ my $Pp = "SQL::Translator::Parser::$parser";
+ load( $Pp ) or die "Can't load $Pp: $@";
+ $self->{'parser'} = \&{ "$Pp\::parse" };
+ $self->{'parser_type'} = $Pp;
+ $self->debug("Got parser: $Pp\n");
+ }
+
+ #
+ # At this point, $self->{'parser'} contains a subroutine
+ # reference that is ready to run
+ #
+ $self->parser_args( @_ ) if (@_);
}
- else {
- my $msg = "The parsers '$from' is not valid.\n" .
- "Please choose from the following list:\n";
- $msg .= " $_\n" for sort keys %parsers;
- return $self->error_out( $msg );
+
+ return $self->{'parser'};
+}
+
+# ----------------------------------------------------------------------
+sub parser_type { $_[0]->{'parser_type'} }
+
+# ----------------------------------------------------------------------
+# XXX See notes on producer_args, above
+sub parser_args {
+ my $self = shift;
+ if (@_) {
+ my $args = isa($_[0], 'HASH') ? shift : { @_ };
+ $self->{'parser_args'} = $args;
}
+ $self->{'parser_args'};
+}
+
+# ----------------------------------------------------------------------
+=head2 B<show_warnings>
- if ( exists $producers{ $to } ) {
- $self->{'to'} = $to;
- warn "Using producer '$to.'\n" if $verbose;
+Toggles whether to print warnings of name conflicts, identifier
+mutations, etc. Probably only generated by producers to let the user
+know when something won't translate very smoothly (e.g., MySQL "enum"
+fields into Oracle). Accepts a true or false value, returns the
+current value.
+
+=cut
+
+sub show_warnings {
+ my $self = shift;
+ my $arg = shift;
+ if ( defined $arg ) {
+ $self->{'show_warnings'} = $arg ? 1 : 0;
}
- else {
- my $msg = "The producer '$to' is not valid.\n" .
- "Please choose from the following list:\n";
- $msg .= " $_\n" for sort keys %producers;
- return $self->error_out( $msg );
+ return $self->{'show_warnings'} || 0;
+}
+
+# ----------------------------------------------------------------------
+=head2 B<translate>
+
+The B<translate> method calls the subroutines referenced by the
+B<parser> and B<producer> data members (described above). It accepts
+as arguments a number of things, in key => value format, including
+(potentially) a parser and a producer (they are passed directly to the
+B<parser> and B<producer> methods).
+
+Here is how the parameter list to B<translate> is parsed:
+
+=over
+
+=item *
+
+1 argument means it's the data to be parsed; which could be a string
+(filename) or a refernce to a scalar (a string stored in memory), or a
+reference to a hash, which is parsed as being more than one argument
+(see next section).
+
+ # Parse the file /path/to/datafile
+ my $output = $tr->translate("/path/to/datafile");
+
+ # Parse the data contained in the string $data
+ my $output = $tr->translate(\$data);
+
+=item *
+
+More than 1 argument means its a hash of things, and it might be
+setting a parser, producer, or datasource (this key is named
+"filename" or "file" if it's a file, or "data" for a SCALAR reference.
+
+ # As above, parse /path/to/datafile, but with different producers
+ for my $prod ("MySQL", "XML", "Sybase") {
+ print $tr->translate(
+ producer => $prod,
+ filename => "/path/to/datafile",
+ );
+ }
+
+ # The filename hash key could also be:
+ datasource => \$data,
+
+You get the idea.
+
+=back
+
+# ----------------------------------------------------------------------
+=head2 B<filename>, B<data>
+
+Using the B<filename> method, the filename of the data to be parsed
+can be set. This method can be used in conjunction with the B<data>
+method, below. If both the B<filename> and B<data> methods are
+invoked as mutators, the data set in the B<data> method is used.
+
+ $tr->filename("/my/data/files/create.sql");
+
+or:
+
+ my $create_script = do {
+ local $/;
+ open CREATE, "/my/data/files/create.sql" or die $!;
+ <CREATE>;
+ };
+ $tr->data(\$create_script);
+
+B<filename> takes a string, which is interpreted as a filename.
+B<data> takes a reference to a string, which is used as the data to be
+parsed. If a filename is set, then that file is opened and read when
+the B<translate> method is called, as long as the data instance
+variable is not set.
+
+=cut
+
+# filename - get or set the filename
+sub filename {
+ my $self = shift;
+ if (@_) {
+ my $filename = shift;
+ if (-d $filename) {
+ my $msg = "Cannot use directory '$filename' as input source";
+ return $self->error($msg);
+ } elsif (-f _ && -r _) {
+ $self->{'filename'} = $filename;
+ $self->debug("Got filename: '$self->{'filename'}'\n");
+ } else {
+ my $msg = "Cannot use '$filename' as input source: ".
+ "file does not exist or is not readable.";
+ return $self->error($msg);
+ }
}
- #
- # Slurp the entire text file we're parsing.
- #
- my $parser = $self->parser;
- my $producer = $self->producer;
- my $data;
- for my $file ( @$input ) {
- warn "Parsing file '$file.'\n" if $verbose;
- open my $fh, $file or return $self->error_out( "Can't read $file: $!" );
+ $self->{'filename'};
+}
+
+# ----------------------------------------------------------------------
+# data - get or set the data
+# if $self->{'data'} is not set, but $self->{'filename'} is, then
+# $self->{'filename'} is opened and read, whith the results put into
+# $self->{'data'}.
+sub data {
+ my $self = shift;
+
+ # Set $self->{'data'} to $_[0], if it is provided.
+ if (@_) {
+ my $data = shift;
+ if (isa($data, "SCALAR")) {
+ $self->{'data'} = $data;
+ }
+ elsif (! ref $data) {
+ $self->{'data'} = \$data;
+ }
+ }
+
+ # If we have a filename but no data yet, populate.
+ if (not $self->{'data'} and my $filename = $self->filename) {
+ $self->debug("Opening '$filename' to get contents.\n");
+ local *FH;
local $/;
- $data = $parser->parse( <$fh> );
+ my $data;
+
+ unless (open FH, $filename) {
+ return $self->error("Can't read file '$filename': $!");
+ }
+
+ $data = <FH>;
+ $self->{'data'} = \$data;
+
+ unless (close FH) {
+ return $self->error("Can't close file '$filename': $!");
+ }
}
- warn "Data =\n", Dumper( $data ) if $verbose;
- my $output = $producer->translate( $data );
+ return $self->{'data'};
}
-#-----------------------------------------------------
-sub parser {
-#
-# Figures out which module to load based on the "from" argument
-#
+# ----------------------------------------------------------------------
+=pod
+
+=head2 B<trace>
+
+Turns on/off the tracing option of Parse::RecDescent.
+
+=cut
+
+sub trace {
my $self = shift;
- unless ( $self->{'parser'} ) {
- my $parser_module =
- 'SQL::Translator::Parser::'.$parsers{ $self->{'from'} };
- $self->{'parser'} = $parser_module->new;
+ my $arg = shift;
+ if ( defined $arg ) {
+ $self->{'trace'} = $arg ? 1 : 0;
}
- return $self->{'parser'};
+ return $self->{'trace'} || 0;
}
-#-----------------------------------------------------
-sub producer {
-#
-# Figures out which module to load based on the "to" argument
-#
+# ----------------------------------------------------------------------
+sub translate {
my $self = shift;
- unless ( $self->{'producer'} ) {
- my $from = $parsers{ $self->{'from'} };
- my $producer_module =
- 'SQL::Translator::Producer::'.$producers{ $self->{'to'} };
- $self->{'producer'} = $producer_module->new( from => $from );
+ my ($args, $parser, $parser_type, $producer, $producer_type);
+ my ($parser_output, $producer_output);
+
+ # Parse arguments
+ if (@_ == 1) {
+ # Passed a reference to a hash?
+ if (isa($_[0], 'HASH')) {
+ # yep, a hashref
+ $self->debug("translate: Got a hashref\n");
+ $args = $_[0];
+ }
+
+ # Passed a reference to a string containing the data
+ elsif (isa($_[0], 'SCALAR')) {
+ # passed a ref to a string
+ $self->debug("translate: Got a SCALAR reference (string)\n");
+ $self->data($_[0]);
+ }
+
+ # Not a reference; treat it as a filename
+ elsif (! ref $_[0]) {
+ # Not a ref, it's a filename
+ $self->debug("translate: Got a filename\n");
+ $self->filename($_[0]);
+ }
+
+ # Passed something else entirely.
+ else {
+ # We're not impressed. Take your empty string and leave.
+ # return "";
+
+ # Actually, if data, parser, and producer are set, then we
+ # can continue. Too bad, because I like my comment
+ # (above)...
+ return "" unless ($self->data &&
+ $self->producer &&
+ $self->parser);
+ }
}
- return $self->{'producer'};
+ else {
+ # You must pass in a hash, or you get nothing.
+ return "" if @_ % 2;
+ $args = { @_ };
+ }
+
+ # ----------------------------------------------------------------------
+ # Can specify the data to be transformed using "filename", "file",
+ # "data", or "datasource".
+ # ----------------------------------------------------------------------
+ if (my $filename = ($args->{'filename'} || $args->{'file'})) {
+ $self->filename($filename);
+ }
+
+ if (my $data = ($self->{'data'} || $self->{'datasource'})) {
+ $self->data($data);
+ }
+
+ # ----------------------------------------------------------------
+ # Get the data.
+ # ----------------------------------------------------------------
+ my $data = $self->data;
+ unless (length $$data) {
+ return $self->error("Empty data file!");
+ }
+
+ # ----------------------------------------------------------------
+ # Local reference to the parser subroutine
+ # ----------------------------------------------------------------
+ if ($parser = ($args->{'parser'} || $args->{'from'})) {
+ $self->parser($parser);
+ }
+ $parser = $self->parser;
+ $parser_type = $self->parser_type;
+
+ # ----------------------------------------------------------------
+ # Local reference to the producer subroutine
+ # ----------------------------------------------------------------
+ if ($producer = ($args->{'producer'} || $args->{'to'})) {
+ $self->producer($producer);
+ }
+ $producer = $self->producer;
+ $producer_type = $self->producer_type;
+
+ # ----------------------------------------------------------------
+ # Execute the parser, then execute the producer with that output.
+ # Allowances are made for each piece to die, or fail to compile,
+ # since the referenced subroutines could be almost anything. In
+ # the future, each of these might happen in a Safe environment,
+ # depending on how paranoid we want to be.
+ # ----------------------------------------------------------------
+ eval { $parser_output = $parser->($self, $$data) };
+ if ($@ || ! $parser_output) {
+ my $msg = sprintf "translate: Error with parser '%s': %s",
+ $parser_type, ($@) ? $@ : " no results";
+ return $self->error($msg);
+ }
+
+ eval { $producer_output = $producer->($self, $parser_output) };
+ if ($@ || ! $producer_output) {
+ my $msg = sprintf "translate: Error with producer '%s': %s",
+ $producer_type, ($@) ? $@ : " no results";
+ return $self->error($msg);
+ }
+
+ return $producer_output;
+}
+
+# ----------------------------------------------------------------------
+sub list_producers {
+ require SQL::Translator::Producer;
+ my $path = catfile(dirname($INC{'SQL/Translator/Producer.pm'}), "Producer");
+ my $dh = IO::Dir->new($path);
+
+ my @available = map { join "::", "SQL::Translator::Producer", $_ }
+ grep /\.pm$/, $dh->read;
+
+ return @available;
+}
+
+# ----------------------------------------------------------------------
+sub list_parsers {
+ require SQL::Translator::Parser;
+ my $path = catfile(dirname($INC{'SQL/Translator/Parser.pm'}), "Parser");
+ my $dh = IO::Dir->new($path);
+
+ my @available = map { join "::", "SQL::Translator::Parser", $_ }
+ grep /\.pm$/, $dh->read;
+
+ return @available;
+}
+
+# ----------------------------------------------------------------------
+sub load {
+ my $module = do { my $m = shift; $m =~ s[::][/]g; "$m.pm" };
+ return 1 if $INC{$module};
+
+ eval { require $module };
+
+ return if ($@);
+ return 1;
}
+# ----------------------------------------------------------------------
+sub isa { UNIVERSAL::isa($_[0], $_[1]) }
+
1;
#-----------------------------------------------------
# Henry David Thoreau
#-----------------------------------------------------
-=head1 NAME
-
-SQL::Translator - convert schema from one database to another
-
-=head1 SYNOPSIS
+=pod
- use SQL::Translator;
- my $translator = SQL::Translator->new;
- my $output = $translator->translate(
- from => 'mysql',
- to => 'oracle',
- file => $file,
- ) or die $translator->error;
- print $output;
+=head1 AUTHORS
-=head1 DESCRIPTION
+Ken Y. Clark, E<lt>kclark@cpan.org<gt>,
+darren chamberlain E<lt>darren@cpan.orgE<gt>,
+Chris Mungall E<lt>cjm@fruitfly.orgE<gt>
-This module attempts to simplify the task of converting one database
-create syntax to another through the use of Parsers and Producers.
-The idea is that any Parser can be used with any Producer in the
-conversion process. So, if you wanted PostgreSQL-to-Oracle, you could
-just write the PostgreSQL parser and use an existing Oracle producer.
+=head1 COPYRIGHT
-Currently, the existing parsers use Parse::RecDescent, and the
-producers are just printing formatted output of the parsed data
-structure. New parsers don't necessarily have to use
-Parse::RecDescent, however, as long as the data structure conforms to
-what the producers are expecting. With this separation of code, it is
-hoped that developers will find it easy to add more database dialects
-by using what's written, writing only what they need, and then
-contributing their parsers or producers back to the project.
+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; version 2.
-=head1 AUTHOR
+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.
-Ken Y. Clark, kclark@logsoft.com
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+USA
=head1 SEE ALSO
-perl(1).
+L<perl>, L<Parse::RecDescent>
=cut
projects / dbsrgits/SQL-Translator.git / blobdiff