package SQL::Translator;
# ----------------------------------------------------------------------
-# $Id: Translator.pm,v 1.60 2004-11-09 02:09:52 grommit Exp $
+# $Id: Translator.pm,v 1.68 2005-06-09 02:02:00 grommit Exp $
# ----------------------------------------------------------------------
# Copyright (C) 2002-4 The SQLFairy Authors
#
require 5.004;
-$VERSION = '0.06';
-$REVISION = sprintf "%d.%02d", q$Revision: 1.60 $ =~ /(\d+)\.(\d+)/;
+$VERSION = '0.07';
+$REVISION = sprintf "%d.%02d", q$Revision: 1.68 $ =~ /(\d+)\.(\d+)/;
$DEBUG = 0 unless defined $DEBUG;
$ERROR = "";
}
#
+ # Initialize the filters.
+ #
+ if ( $config->{filters} && ref $config->{filters} eq "ARRAY" ) {
+ $self->filters( @{$config->{filters}} )
+ || return $self->error('Error inititializing filters: '.$self->error);
+ }
+
+ #
# 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
+ # Finally, if there is a 'data' parameter, use that in
# preference to filename and file
#
if ( my $data = $config->{'data'} ) {
$self->{'debug'} = defined $config->{'debug'} ? $config->{'debug'} : $DEBUG;
$self->add_drop_table( $config->{'add_drop_table'} );
-
+
$self->no_comments( $config->{'no_comments'} );
$self->show_warnings( $config->{'show_warnings'} );
# ----------------------------------------------------------------------
sub producer {
shift->_tool({
- name => 'producer',
+ name => 'producer',
path => "SQL::Translator::Producer",
- default_sub => "produce"
+ default_sub => "produce",
}, @_);
}
# ----------------------------------------------------------------------
sub parser {
shift->_tool({
- name => 'parser',
+ name => 'parser',
path => "SQL::Translator::Parser",
- default_sub => "parse"
+ default_sub => "parse",
}, @_);
}
sub parser_args { shift->_args("parser", @_); }
# ----------------------------------------------------------------------
+# e.g.
+# $sqlt->filters => [
+# sub { },
+# [ "NormalizeNames", field => "lc", tabel => "ucfirst" ],
+# [
+# "DataTypeMap",
+# "TEXT" => "BIGTEXT",
+# ],
+# ],
+# ----------------------------------------------------------------------
+sub filters {
+ my $self = shift;
+ my $filters = $self->{filters} ||= [];
+ return @$filters unless @_;
+
+ # Set. Convert args to list of [\&code,@args]
+ foreach (@_) {
+ my ($filt,@args) = ref($_) eq "ARRAY" ? @$_ : $_;
+ if ( isa($filt,"CODE") ) {
+ push @$filters, [$filt,@args];
+ next;
+ }
+ else {
+ $self->debug("Adding $filt filter. Args:".Dumper(\@args)."\n");
+ $filt = _load_sub("$filt\::filter", "SQL::Translator::Filter")
+ || return $self->error(__PACKAGE__->error);
+ push @$filters, [$filt,@args];
+ }
+ }
+ return @$filters;
+}
+
+# ----------------------------------------------------------------------
sub show_warnings {
my $self = shift;
my $arg = shift;
my ($parser_output, $producer_output);
# Parse arguments
- if (@_ == 1) {
+ if (@_ == 1) {
# Passed a reference to a hash?
if (isa($_[0], 'HASH')) {
# yep, a hashref
$producer_type = $self->producer_type;
# ----------------------------------------------------------------
- # Execute the parser, then execute the producer with that output.
+ # Execute the parser, the filters and then execute the producer.
# 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.
# ----------------------------------------------------------------
+
+ # Run parser
unless ( defined $self->{'schema'} ) {
eval { $parser_output = $parser->($self, $$data) };
if ($@ || ! $parser_output) {
return $self->error($msg);
}
}
-
$self->debug("Schema =\n", Dumper($self->schema), "\n");
+ # Validate the schema if asked to.
if ($self->validate) {
my $schema = $self->schema;
return $self->error('Invalid schema') unless $schema->is_valid;
}
+ # Run filters
+ my $filt_num = 0;
+ foreach ($self->filters) {
+ $filt_num++;
+ my ($code,@args) = @$_;
+ eval { $code->($self->schema, @args) };
+ my $err = $@ || $self->error || 0;
+ return $self->error("Error with filter $filt_num : $err") if $err;
+ }
+
+ # Run producer
eval { $producer_output = $producer->($self) };
if ($@ || ! $producer_output) {
my $err = $@ || $self->error || "no results";
sub _tool {
my ($self,$args) = (shift, shift);
my $name = $args->{name};
- return $self->{$name} unless @_;
+ return $self->{$name} unless @_; # get accessor
+
+ my $path = $args->{path};
+ my $default_sub = $args->{default_sub};
my $tool = shift;
-
+
# passed an anonymous subroutine reference
if (isa($tool, 'CODE')) {
$self->{$name} = $tool;
$self->{"$name\_type"} = "CODE";
$self->debug("Got $name: code ref\n");
- }
+ }
- # Passed a module name or module and sub 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,
+ # so we give it a go.
else {
- 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.
$tool =~ s/-/::/g if $tool !~ /::/;
- if ( my $loaded = load($tool => $args->{path}) ) {
- $tool = $loaded;
- $func_name = $args->{default_sub};
- }
-
- # Passed Module::Name::function; try to recover
- else {
- my @func_parts = split /::/, $tool;
- $func_name = pop @func_parts;
- $tool = join "::", @func_parts;
-
- # If this doesn't work, then we have a legitimate
- # problem.
- load($tool) or die "Can't load $tool: $@";
+ my ($code,$sub);
+ ($code,$sub) = _load_sub("$tool\::$default_sub", $path);
+ unless ($code) {
+ if ( __PACKAGE__->error =~ m/Can't find module/ ) {
+ # Mod not found so try sub
+ ($code,$sub) = _load_sub("$tool", $path) unless $code;
+ die "Can't load $name subroutine '$tool' : ".__PACKAGE__->error
+ unless $code;
+ }
+ else {
+ die "Can't load $name '$tool' : ".__PACKAGE__->error;
+ }
}
# get code reference and assign
- $self->{$name} = \&{ "$tool\::$func_name" };
- $self->{"$name\_type"} = $tool;
- $self->debug("Got $name: $tool\::$func_name\n");
- }
+ my (undef,$module,undef) = $sub =~ m/((.*)::)?(\w+)$/;
+ $self->{$name} = $code;
+ $self->{"$name\_type"} = $sub eq "CODE" ? "CODE" : $module;
+ $self->debug("Got $name: $sub\n");
+ }
# At this point, $self->{$name} contains a subroutine
# reference that is ready to run
# MODULE - is the name of the module to load.
#
# PATH - optional list of 'package paths' to look for the module in. e.g
-# If you called load(Bar => 'Foo', 'My::Modules') it will try to load the mod
-# Bar then Foo::Bar then My::Modules::Bar.
+# If you called load('Super::Foo' => 'My', 'Other') it will
+# try to load the mod Super::Foo then My::Super::Foo then Other::Super::Foo.
#
# Returns package name of the module actually loaded or false and sets error.
#
-# Note, you can't load a name from the root namespace (ie one without '::' in
+# Note, you can't load a name from the root namespace (ie one without '::' in
# it), therefore a single word name without a path fails.
# ----------------------------------------------------------------------
sub load {
my $file = $module; $file =~ s[::][/]g; $file .= ".pm";
__PACKAGE__->debug("Loading $name as $file\n");
return $module if $INC{$file}; # Already loaded
-
+
eval { require $file };
next if $@ =~ /Can't locate $file in \@INC/;
- eval { $file->import(@_) } unless $@;
- return __PACKAGE__->error("Error loading $name as $module : $@") if $@;
+ eval { $module->import() } unless $@;
+ return __PACKAGE__->error("Error loading $name as $module : $@")
+ if $@ && $@ !~ /"SQL::Translator::Producer" is not exported/;
return $module; # Module loaded ok
}
- return 0;
+ return __PACKAGE__->error("Can't find module $name. Path:".join(",",@path));
+}
+
+# ----------------------------------------------------------------------
+# Load the sub name given (including package), optionally using a base package
+# path. Returns code ref and name of sub loaded, including its package.
+# (\&code, $sub) = load_sub( 'MySQL::produce', "SQL::Translator::Producer" );
+# (\&code, $sub) = load_sub( 'MySQL::produce', @path );
+# ----------------------------------------------------------------------
+sub _load_sub {
+ my ($tool, @path) = @_;
+
+ my (undef,$module,$func_name) = $tool =~ m/((.*)::)?(\w+)$/;
+ if ( my $module = load($module => @path) ) {
+ my $sub = "$module\::$func_name";
+ return wantarray ? ( \&{ $sub }, $sub ) : \&$sub;
+ }
+ return undef;
}
# ----------------------------------------------------------------------
}
# ----------------------------------------------------------------------
-# The other format_*_name methods rely on this one. It optionally
+# The other format_*_name methods rely on this one. It optionally
# accepts a subroutine ref as the first argument (or uses an identity
# sub if one isn't provided or it doesn't already exist), and applies
# it to the rest of the arguments (if any).
# Print debug info
debug => 1,
# Print Parse::RecDescent trace
- trace => 0,
+ trace => 0,
# Don't include comments in output
- no_comments => 0,
+ no_comments => 0,
# Print name mutations, conflicts
- show_warnings => 0,
+ show_warnings => 0,
# Add "drop table" statements
- add_drop_table => 1,
+ add_drop_table => 1,
# Validate schema object
- validate => 1,
+ validate => 1,
# Make all table names CAPS in producers which support this option
format_table_name => sub {my $tablename = shift; return uc($tablename)},
# Null-op formatting, only here for documentation's sake
from => 'MySQL',
to => 'Oracle',
# Or an arrayref of filenames, i.e. [ $file1, $file2, $file3 ]
- filename => $file,
+ filename => $file,
) or die $translator->error;
print $output;
=item *
+filters
+
+=item *
+
filename / file
=item *
There is also C<parser_type> and C<parser_args>, which perform
analogously to C<producer_type> and C<producer_args>
+=head2 filters
+
+Set or retreive the filters to run over the schema during the
+translation, before the producer creates its output. Filters are sub
+routines called, in order, with the schema object to filter as the 1st
+arg and a hash of options (passed as a list) for the rest of the args.
+They are free to do whatever they want to the schema object, which will be
+handed to any following filters, then used by the producer.
+
+Filters are set as an array, which gives the order they run in.
+Like parsers and producers, they can be defined by a module name, a
+module name relative to the SQL::Translator::Filter namespace, a module
+name and function name together or a reference to an anonymous subroutine.
+When using a module name a function called C<filter> will be invoked in
+that package to do the work.
+
+To pass args to the filter set it as an array ref with the 1st value giving
+the filter (name or sub) and the rest its args. e.g.
+
+ $tr->filters(
+ sub {
+ my $schema = shift;
+ # Do stuff to schema here!
+ },
+ DropFKeys,
+ [ "Names", table => 'lc' ],
+ [ "Foo", foo => "bar", hello => "world" ],
+ [ "Filter5" ],
+ );
+
+Although you normally set them in the constructor, which calls
+through to filters. i.e.
+
+ my $translator = SQL::Translator->new(
+ ...
+ filters => [
+ sub { ... },
+ [ "Names", table => 'lc' ],
+ ],
+ ...
+ );
+
+See F<t/36-filters.t> for more examples.
+
+Multiple set calls to filters are cumulative with new filters added to
+the end of the current list.
+
+Returns the filters as a list of array refs, the 1st value being a
+reference to the filter sub and the rest its args.
+
=head2 show_warnings
Toggles whether to print warnings of name conflicts, identifier
=head2 translate
-The C<translate> method calls the subroutines referenced by the
-C<parser> and C<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
-C<parser> and C<producer> methods).
+The C<translate> method calls the subroutine referenced by the
+C<parser> data member, then calls any C<filters> and finally calls
+the C<producer> sub routine (these members are 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 C<parser> and C<producer> methods).
Here is how the parameter list to C<translate> is parsed:
projects / dbsrgits/SQL-Translator.git / blobdiff