[dbsrgits/SQL-Translator.git] / lib / SQL / Translator / Parser / PostgreSQL.pm

package SQL::Translator::Parser::PostgreSQL;

# -------------------------------------------------------------------
# $Id: PostgreSQL.pm,v 1.8 2003-02-25 21:58:46 kycl4rk Exp $
# -------------------------------------------------------------------
# Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>,
#                    Allen Day <allenday@users.sourceforge.net>,
#                    darren chamberlain <darren@cpan.org>,
#                    Chris Mungall <cjm@fruitfly.org>
#
# 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::Parser::PostgreSQL - parser for PostgreSQL

=head1 SYNOPSIS

  use SQL::Translator;
  use SQL::Translator::Parser::PostgreSQL;

  my $translator = SQL::Translator->new;
  $translator->parser("SQL::Translator::Parser::PostgreSQL");

=head1 DESCRIPTION

The grammar was started from the MySQL parsers.  Here is the description 
from PostgreSQL:

Table:
(http://www.postgresql.org/docs/view.php?version=7.3&idoc=1&file=sql-createtable.html)

  CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name (
      { column_name data_type [ DEFAULT default_expr ] 
         [ column_constraint [, ... ] ]
      | table_constraint }  [, ... ]
  )
  [ INHERITS ( parent_table [, ... ] ) ]
  [ WITH OIDS | WITHOUT OIDS ]
  
  where column_constraint is:
  
  [ CONSTRAINT constraint_name ]
  { NOT NULL | NULL | UNIQUE | PRIMARY KEY |
    CHECK (expression) |
    REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL ]
      [ ON DELETE action ] [ ON UPDATE action ] }
  [ DEFERRABLE | NOT DEFERRABLE ] 
  [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
  
  and table_constraint is:
  
  [ CONSTRAINT constraint_name ]
  { UNIQUE ( column_name [, ... ] ) |
    PRIMARY KEY ( column_name [, ... ] ) |
    CHECK ( expression ) |
    FOREIGN KEY ( column_name [, ... ] ) 
     REFERENCES reftable [ ( refcolumn [, ... ] ) ]
      [ MATCH FULL | MATCH PARTIAL ] 
      [ ON DELETE action ] [ ON UPDATE action ] }
  [ DEFERRABLE | NOT DEFERRABLE ] 
  [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]

Index:
(http://www.postgresql.org/docs/view.php?version=7.3&idoc=1&file=sql-createindex.html)

  CREATE [ UNIQUE ] INDEX index_name ON table
      [ USING acc_method ] ( column [ ops_name ] [, ...] )
      [ WHERE predicate ]
  CREATE [ UNIQUE ] INDEX index_name ON table
      [ USING acc_method ] ( func_name( column [, ... ]) [ ops_name ] )
      [ WHERE predicate ]

=cut

use strict;
use vars qw[ $DEBUG $VERSION $GRAMMAR @EXPORT_OK ];
$VERSION = sprintf "%d.%02d", q$Revision: 1.8 $ =~ /(\d+)\.(\d+)/;
$DEBUG   = 0 unless defined $DEBUG;

use Data::Dumper;
use Parse::RecDescent;
use Exporter;
use base qw(Exporter);

@EXPORT_OK = qw(parse);

# Enable warnings within the Parse::RecDescent module.
$::RD_ERRORS = 1; # Make sure the parser dies when it encounters an error
$::RD_WARN   = 1; # Enable warnings. This will warn on unused rules &c.
$::RD_HINT   = 1; # Give out hints to help fix problems.

my $parser; # should we do this?  There's no programmic way to 
            # change the grammar, so I think this is safe.

$GRAMMAR = q!

{ our ( %tables, $table_order ) }

#
# The "eofile" rule makes the parser fail if any "statement" rule
# fails.  Otherwise, the first successful match by a "statement" 
# won't cause the failure needed to know that the parse, as a whole,
# failed. -ky
#
startrule : statement(s) eofile { \%tables }

eofile : /^\Z/

statement : create
  | comment
  | grant
  | revoke
  | drop
  | connect
  | <error>

connect : /^\s*\\\connect.*\n/

revoke : /revoke/i WORD(s /,/) /on/i table_name /from/i name_with_opt_quotes(s /,/) ';'
    {
        my $table_name = $item{'table_name'};
        push @{ $tables{ $table_name }{'permissions'} }, {
            type       => 'revoke',
            actions    => $item[2],
            users      => $item[6],
        }
    }

grant : /grant/i WORD(s /,/) /on/i table_name /to/i name_with_opt_quotes(s /,/) ';'
    {
        my $table_name = $item{'table_name'};
        push @{ $tables{ $table_name }{'permissions'} }, {
            type       => 'grant',
            actions    => $item[2],
            users      => $item[6],
        }
    }

drop : /drop/i /[^;]*/ ';'

create : create_table table_name '(' create_definition(s /,/) ')' table_option(s?) ';'
    {
        my $table_name                       = $item{'table_name'};
        $tables{ $table_name }{'order'}      = ++$table_order;
        $tables{ $table_name }{'table_name'} = $table_name;

        my $i = 1;
        my @constraints;
        for my $definition ( @{ $item[4] } ) {
            if ( $definition->{'type'} eq 'field' ) {
                my $field_name = $definition->{'name'};
                $tables{ $table_name }{'fields'}{ $field_name } = 
                    { %$definition, order => $i };
                $i++;
				
                if ( $definition->{'is_primary_key'} ) {
                    push @{ $tables{ $table_name }{'indices'} }, {
                        type   => 'primary_key',
                        fields => [ $field_name ],
                    };
                }

                for my $constraint ( @{ $definition->{'constaints'} || [] } ) {
                    $constraint->{'fields' } = [ $field_name ];
                    push @{$tables{ $table_name }{'constraints'}}, $constraint;
                }
            }
            elsif ( $definition->{'type'} eq 'constraint' ) {
                $definition->{'type'} = $definition->{'constraint_type'};
                push @{ $tables{ $table_name }{'constraints'} }, $definition;
            }
            else {
                push @{ $tables{ $table_name }{'indices'} }, $definition;
            }
        }

        for my $option ( @{ $item[6] } ) {
            $tables{ $table_name }{'table_options'}{ $option->{'type'} } = 
                $option;
        }

        1;
    }

create : /create/i unique(?) /(index|key)/i index_name /on/i table_name using_method(?) '(' field_name(s /,/) ')' where_predicate(?) ';'
    {
        push @{ $tables{ $item{'table_name'} }{'indices'} },
            {
                name   => $item{'index_name'},
                type   => $item{'unique'}[0] ? 'unique' : 'normal',
                fields => $item[9],
                method => $item{'using_method'}[0],
            }
        ;
    }

using_method : /using/i WORD { $item[2] }

where_predicate : /where/i /[^;]+/

create_definition : field
    | table_constraint
    | <error>

comment : /^\s*(?:#|-{2}).*\n/

field : comment(s?) field_name data_type field_meta(s?) comment(s?)
    {
        my ( $default, @constraints );
        for my $meta ( @{ $item[4] } ) {
            $default = $meta if $meta->{'meta_type'} eq 'default';
            push @constraints, $meta if $meta->{'meta_type'} eq 'constraint';
        }

        my $null = ( grep { $_->{'type'} eq 'not_null' } @constraints ) ? 0 : 1;

        my @comments = ( @{ $item[1] }, @{ $item[5] } );

        $return = { 
            type           => 'field',
            name           => $item{'field_name'}, 
            data_type      => $item{'data_type'}{'type'},
            size           => $item{'data_type'}{'size'},
            list           => $item{'data_type'}{'list'},
            null           => $null,
            default        => $default->{'value'},
            constraints    => [ @constraints ],
            comments       => [ @comments ],
        } 
    }
    | <error>

field_meta : default_val
    |
    column_constraint

column_constraint : constraint_name(?) column_constraint_type deferrable(?) deferred(?)
    {
        my $desc       = $item{'column_constraint_type'};
        my $type       = $desc->{'type'};
        my $fields     = $desc->{'fields'}     || [];
        my $expression = $desc->{'expression'} || '';

        $return              =  {
            meta_type        => 'constraint',
            name             => $item{'constraint_name'}[0] || '',
            type             => $type,
            expression       => $type eq 'check' ? $expression : '',
            deferreable      => $item{'deferrable'},
            deferred         => $item{'deferred'},
            reference_table  => $desc->{'reference_table'},
            reference_fields => $desc->{'reference_fields'},
            match_type       => $desc->{'match_type'},
            on_delete_do     => $desc->{'on_delete_do'},
            on_update_do     => $desc->{'on_update_do'},
        } 
    }

constraint_name : /constraint/i name_with_opt_quotes { $item[2] }

column_constraint_type : /not null/i { $return = { type => 'not_null' } }
    |
    /null/ 
        { $return = { type => 'null' } }
    |
    /unique/ 
        { $return = { type => 'unique' } }
    |
    /primary key/i 
        { $return = { type => 'primary_key' } }
    |
    /check/i '(' /[^)]+/ ')' 
        { $return = { type => 'check', expression => $item[2] } }
    |
    /references/i table_name parens_value_list(?) match_type(?) on_delete_do(?) on_update_do(?)
    {
        $return              =  {
            type             => 'foreign_key',
            reference_table  => $item[2],
            reference_fields => $item[3],
            match_type       => $item[4][0],
            on_delete_do     => $item[5][0],
            on_update_do     => $item[6][0],
        }
    }

table_name : name_with_opt_quotes

field_name : name_with_opt_quotes

name_with_opt_quotes : double_quote(?) WORD double_quote(?) { $item[2] }

double_quote: /"/

index_name : WORD

data_type : pg_data_type parens_value_list(?)
    { 
        my $type = $item[1];

        #
        # We can deduce some sizes from the data type's name.
        #
        my $size; 
        if ( ref $type eq 'ARRAY' ) {
            $size = [ $type->[1] ];
            $type = $type->[0];
        }
        else {
            $size = $item[2][0] || '';
        }

        $return  = { 
            type => $type,
            size => $size,
        } 
    }

pg_data_type :
    /(bigint|int8|bigserial|serial8)/ { $return = [ 'integer', 8 ] }
    |
    /(smallint|int2)/ { $return = [ 'integer', 2 ] }
    |
    /int(eger)?|int4/ { $return = [ 'integer', 4 ] }
    |
    /(double precision|float8?)/ { $return = [ 'float', 8 ] }
    |
    /(real|float4)/ { $return = [ 'real', 4 ] }
    |
    /serial4?/ { $return = [ 'serial', 4 ] }
    |
    /bigserial/ { $return = [ 'serial', 8 ] }
    |
    /(bit varying|varbit)/ { $return = 'varbit' }
    |
    /character varying/ { $return = 'varchar' }
    |
    /char(acter)?/ { $return = 'char' }
    |
    /bool(ean)?/ { $return = 'boolean' }
    |
    /(bytea|binary data)/ { $return = 'binary' }
    |
    /timestampz?/ { $return = 'timestamp' }
    |
    /(bit|box|cidr|circle|date|inet|interval|line|lseg|macaddr|money|numeric|decimal|path|point|polygon|text|time|varchar)/
    { $item[1] }

parens_value_list : '(' VALUE(s /,/) ')'
    { $item[2] }

parens_word_list : '(' WORD(s /,/) ')'
    { $item[2] }

field_size : '(' num_range ')' { $item{'num_range'} }

num_range : DIGITS ',' DIGITS
    { $return = $item[1].','.$item[3] }
    | DIGITS
    { $return = $item[1] }

table_constraint : comment(s?) constraint_name(?) table_constraint_type deferrable(?) deferred(?) comment(s?)
    {
        my $desc       = $item{'table_constraint_type'};
        my $type       = $desc->{'type'};
        my $fields     = $desc->{'fields'};
        my $expression = $desc->{'expression'};
        my @comments   = ( @{ $item[1] }, @{ $item[-1] } );

        $return              =  {
            name             => $item{'constraint_name'}[0] || '',
            type             => 'constraint',
            constraint_type  => $type,
            fields           => $type ne 'check' ? $fields : [],
            expression       => $type eq 'check' ? $expression : '',
            deferreable      => $item{'deferrable'},
            deferred         => $item{'deferred'},
            reference_table  => $desc->{'reference_table'},
            reference_fields => $desc->{'reference_fields'},
            match_type       => $desc->{'match_type'}[0],
            on_delete_do     => $desc->{'on_delete_do'}[0],
            on_update_do     => $desc->{'on_update_do'}[0],
            comments         => [ @comments ],
        } 
    }

table_constraint_type : /primary key/i '(' name_with_opt_quotes(s /,/) ')' 
    { 
        $return = {
            type   => 'primary_key',
            fields => $item[3],
        }
    }
    |
    /unique/i '(' name_with_opt_quotes(s /,/) ')' 
    { 
        $return    =  {
            type   => 'unique',
            fields => $item[3],
        }
    }
    |
    /check/ '(' /(.+)/ ')'
    {
        $return        =  {
            type       => 'check',
            expression => $item[3],
        }
    }
    |
    /foreign key/i '(' name_with_opt_quotes(s /,/) ')' /references/i table_name parens_word_list(?) match_type(?) on_delete_do(?) on_update_do(?)
    {
        $return              =  {
            type             => 'foreign_key',
            fields           => $item[3],
            reference_table  => $item[6],
            reference_fields => $item[7][0],
            match_type       => $item[8][0],
            on_delete_do     => $item[9][0],
            on_update_do     => $item[10][0],
        }
    }

deferrable : /not/i /deferrable/i 
    { 
        $return = ( $item[1] =~ /not/i ) ? 0 : 1;
    }

deferred : /initially/i /(deferred|immediate)/i { $item[2] }

match_type : /match full/i { 'match_full' }
    |
    /match partial/i { 'match_partial' }

on_delete_do : /on delete/i WORD 
    { $item[2] }

on_update_do : /on update/i WORD
    { $item[2] }

create_table : /create/i /table/i

create_index : /create/i /index/i

default_val  : /default/i /(?:')?[\w\d.-]*(?:')?/ 
    { 
        my $val =  $item[2] || '';
        $val    =~ s/'//g; 
        $return =  {
            meta_type => 'default',
            value     => $val,
        }
    }

auto_inc : /auto_increment/i { 1 }

primary_key : /primary/i /key/i { 1 }

name_with_opt_paren : NAME parens_value_list(s?)
    { $item[2][0] ? "$item[1]($item[2][0][0])" : $item[1] }

unique : /unique/i { 1 }

key : /key/i | /index/i

table_option : /inherits/i '(' name_with_opt_quotes(s /,/) ')'
    { 
        $return = { type => 'inherits', table_name => $item[3] }
    }
    |
    /with(out)? oids/i
    {
        $return = { type => $item[1] =~ /out/i ? 'without_oids' : 'with_oids' }
    }

SEMICOLON : /\s*;\n?/

WORD : /\w+/

DIGITS : /\d+/

COMMA : ','

NAME    : "`" /\w+/ "`"
    { $item[2] }
    | /\w+/
    { $item[1] }

VALUE   : /[-+]?\.?\d+(?:[eE]\d+)?/
    { $item[1] }
    | /'.*?'/   # XXX doesn't handle embedded quotes
    { $item[1] }
    | /NULL/
    { 'NULL' }

!;

# -------------------------------------------------------------------
sub parse {
    my ( $translator, $data ) = @_;
    $parser ||= Parse::RecDescent->new($GRAMMAR);

    $::RD_TRACE  = $translator->trace ? 1 : undef;
    $DEBUG       = $translator->debug;

    unless (defined $parser) {
        return $translator->error("Error instantiating Parse::RecDescent ".
            "instance: Bad grammer");
    }

    my $result = $parser->startrule($data);
    die "Parse failed.\n" unless defined $result;
    warn Dumper($result) if $DEBUG;
    return $result;
}

1;

#-----------------------------------------------------
# Where man is not nature is barren.
# William Blake
#-----------------------------------------------------

=pod

=head1 AUTHORS

Ken Y. Clark E<lt>kclark@cpan.orgE<gt>,
Allen Day <allenday@users.sourceforge.net>.

=head1 SEE ALSO

perl(1), Parse::RecDescent.

=cut
Commit	Line	Data
84012a55	1	package SQL::Translator::Parser::PostgreSQL;
4422e22a	2
4422e22a	3	# -------------------------------------------------------------------
f2f71b8e	4	# $Id: PostgreSQL.pm,v 1.8 2003-02-25 21:58:46 kycl4rk Exp $
4422e22a	5	# -------------------------------------------------------------------
4422e22a	6	# Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>,
0efb6e1b	7	# Allen Day <allenday@users.sourceforge.net>,
4422e22a	8	# darren chamberlain <darren@cpan.org>,
	9	# Chris Mungall <cjm@fruitfly.org>
	10	#
	11	# This program is free software; you can redistribute it and/or
	12	# modify it under the terms of the GNU General Public License as
	13	# published by the Free Software Foundation; version 2.
	14	#
	15	# This program is distributed in the hope that it will be useful, but
	16	# WITHOUT ANY WARRANTY; without even the implied warranty of
	17	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	# General Public License for more details.
	19	#
	20	# You should have received a copy of the GNU General Public License
	21	# along with this program; if not, write to the Free Software
0efb6e1b	22	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
4422e22a	23	# 02111-1307 USA
	24	# -------------------------------------------------------------------
	25
	26	=head1 NAME
	27
84012a55	28	SQL::Translator::Parser::PostgreSQL - parser for PostgreSQL
4422e22a	29
	30	=head1 SYNOPSIS
	31
	32	use SQL::Translator;
84012a55	33	use SQL::Translator::Parser::PostgreSQL;
4422e22a	34
4422e22a	35	my $translator = SQL::Translator->new;
84012a55	36	$translator->parser("SQL::Translator::Parser::PostgreSQL");
4422e22a	37
	38	=head1 DESCRIPTION
	39
0efb6e1b	40	The grammar was started from the MySQL parsers. Here is the description
	41	from PostgreSQL:
	42
	43	Table:
629b76f9	44	(http://www.postgresql.org/docs/view.php?version=7.3&idoc=1&file=sql-createtable.html)
	45
	46	CREATE [ [ LOCAL ] { TEMPORARY \| TEMP } ] TABLE table_name (
	47	{ column_name data_type [ DEFAULT default_expr ]
	48	[ column_constraint [, ... ] ]
	49	\| table_constraint } [, ... ]
	50	)
	51	[ INHERITS ( parent_table [, ... ] ) ]
	52	[ WITH OIDS \| WITHOUT OIDS ]
	53
	54	where column_constraint is:
	55
	56	[ CONSTRAINT constraint_name ]
	57	{ NOT NULL \| NULL \| UNIQUE \| PRIMARY KEY \|
	58	CHECK (expression) \|
	59	REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL \| MATCH PARTIAL ]
	60	[ ON DELETE action ] [ ON UPDATE action ] }
	61	[ DEFERRABLE \| NOT DEFERRABLE ]
	62	[ INITIALLY DEFERRED \| INITIALLY IMMEDIATE ]
	63
	64	and table_constraint is:
	65
	66	[ CONSTRAINT constraint_name ]
	67	{ UNIQUE ( column_name [, ... ] ) \|
	68	PRIMARY KEY ( column_name [, ... ] ) \|
	69	CHECK ( expression ) \|
	70	FOREIGN KEY ( column_name [, ... ] )
	71	REFERENCES reftable [ ( refcolumn [, ... ] ) ]
	72	[ MATCH FULL \| MATCH PARTIAL ]
	73	[ ON DELETE action ] [ ON UPDATE action ] }
	74	[ DEFERRABLE \| NOT DEFERRABLE ]
	75	[ INITIALLY DEFERRED \| INITIALLY IMMEDIATE ]
0efb6e1b	76
0efb6e1b	77	Index:
629b76f9	78	(http://www.postgresql.org/docs/view.php?version=7.3&idoc=1&file=sql-createindex.html)
0efb6e1b	79
629b76f9	80	CREATE [ UNIQUE ] INDEX index_name ON table
	81	[ USING acc_method ] ( column [ ops_name ] [, ...] )
	82	[ WHERE predicate ]
	83	CREATE [ UNIQUE ] INDEX index_name ON table
	84	[ USING acc_method ] ( func_name( column [, ... ]) [ ops_name ] )
	85	[ WHERE predicate ]
4422e22a	86
	87	=cut
	88
	89	use strict;
	90	use vars qw[ $DEBUG $VERSION $GRAMMAR @EXPORT_OK ];
f2f71b8e	91	$VERSION = sprintf "%d.%02d", q$Revision: 1.8 $ =~ /(\d+)\.(\d+)/;
4422e22a	92	$DEBUG = 0 unless defined $DEBUG;
	93
	94	use Data::Dumper;
	95	use Parse::RecDescent;
	96	use Exporter;
	97	use base qw(Exporter);
	98
	99	@EXPORT_OK = qw(parse);
	100
	101	# Enable warnings within the Parse::RecDescent module.
	102	$::RD_ERRORS = 1; # Make sure the parser dies when it encounters an error
	103	$::RD_WARN = 1; # Enable warnings. This will warn on unused rules &c.
	104	$::RD_HINT = 1; # Give out hints to help fix problems.
	105
	106	my $parser; # should we do this? There's no programmic way to
	107	# change the grammar, so I think this is safe.
	108
	109	$GRAMMAR = q!
	110
0efb6e1b	111	{ our ( %tables, $table_order ) }
4422e22a	112
629b76f9	113	#
	114	# The "eofile" rule makes the parser fail if any "statement" rule
	115	# fails. Otherwise, the first successful match by a "statement"
	116	# won't cause the failure needed to know that the parse, as a whole,
	117	# failed. -ky
	118	#
0efb6e1b	119	startrule : statement(s) eofile { \%tables }
4422e22a	120
0efb6e1b	121	eofile : /^\Z/
	122
	123	statement : create
	124	\| comment
	125	\| grant
	126	\| revoke
4422e22a	127	\| drop
0efb6e1b	128	\| connect
4422e22a	129	\| <error>
4422e22a	130
0efb6e1b	131	connect : /^\s\\\connect.\n/
	132
	133	revoke : /revoke/i WORD(s /,/) /on/i table_name /from/i name_with_opt_quotes(s /,/) ';'
	134	{
	135	my $table_name = $item{'table_name'};
	136	push @{ $tables{ $table_name }{'permissions'} }, {
	137	type => 'revoke',
	138	actions => $item[2],
	139	users => $item[6],
	140	}
	141	}
	142
	143	grant : /grant/i WORD(s /,/) /on/i table_name /to/i name_with_opt_quotes(s /,/) ';'
	144	{
	145	my $table_name = $item{'table_name'};
	146	push @{ $tables{ $table_name }{'permissions'} }, {
	147	type => 'grant',
	148	actions => $item[2],
	149	users => $item[6],
	150	}
	151	}
	152
	153	drop : /drop/i /[^;]*/ ';'
4422e22a	154
ba1a1626	155	create : create_table table_name '(' create_definition(s /,/) ')' table_option(s?) ';'
0efb6e1b	156	{
	157	my $table_name = $item{'table_name'};
	158	$tables{ $table_name }{'order'} = ++$table_order;
	159	$tables{ $table_name }{'table_name'} = $table_name;
	160
	161	my $i = 1;
	162	my @constraints;
	163	for my $definition ( @{ $item[4] } ) {
	164	if ( $definition->{'type'} eq 'field' ) {
	165	my $field_name = $definition->{'name'};
	166	$tables{ $table_name }{'fields'}{ $field_name } =
	167	{ %$definition, order => $i };
	168	$i++;
4422e22a	169
0efb6e1b	170	if ( $definition->{'is_primary_key'} ) {
	171	push @{ $tables{ $table_name }{'indices'} }, {
	172	type => 'primary_key',
	173	fields => [ $field_name ],
	174	};
	175	}
	176
	177	for my $constraint ( @{ $definition->{'constaints'} \|\| [] } ) {
	178	$constraint->{'fields' } = [ $field_name ];
	179	push @{$tables{ $table_name }{'constraints'}}, $constraint;
	180	}
	181	}
	182	elsif ( $definition->{'type'} eq 'constraint' ) {
	183	$definition->{'type'} = $definition->{'constraint_type'};
	184	push @{ $tables{ $table_name }{'constraints'} }, $definition;
	185	}
	186	else {
	187	push @{ $tables{ $table_name }{'indices'} }, $definition;
	188	}
	189	}
	190
	191	for my $option ( @{ $item[6] } ) {
	192	$tables{ $table_name }{'table_options'}{ $option->{'type'} } =
	193	$option;
	194	}
	195
	196	1;
	197	}
	198
	199	create : /create/i unique(?) /(index\|key)/i index_name /on/i table_name using_method(?) '(' field_name(s /,/) ')' where_predicate(?) ';'
4422e22a	200	{
	201	push @{ $tables{ $item{'table_name'} }{'indices'} },
	202	{
0efb6e1b	203	name => $item{'index_name'},
	204	type => $item{'unique'}[0] ? 'unique' : 'normal',
	205	fields => $item[9],
	206	method => $item{'using_method'}[0],
4422e22a	207	}
	208	;
	209	}
	210
0efb6e1b	211	using_method : /using/i WORD { $item[2] }
	212
	213	where_predicate : /where/i /[^;]+/
	214
	215	create_definition : field
0efb6e1b	216	\| table_constraint
4422e22a	217	\| <error>
	218
	219	comment : /^\s(?:#\|-{2}).\n/
	220
f2f71b8e	221	field : comment(s?) field_name data_type field_meta(s?) comment(s?)
4422e22a	222	{
0efb6e1b	223	my ( $default, @constraints );
41fc9cb3	224	for my $meta ( @{ $item[4] } ) {
0efb6e1b	225	$default = $meta if $meta->{'meta_type'} eq 'default';
0efb6e1b	226	push @constraints, $meta if $meta->{'meta_type'} eq 'constraint';
4422e22a	227	}
4422e22a	228
0efb6e1b	229	my $null = ( grep { $_->{'type'} eq 'not_null' } @constraints ) ? 0 : 1;
0efb6e1b	230
f2f71b8e	231	my @comments = ( @{ $item[1] }, @{ $item[5] } );
f2f71b8e	232
4422e22a	233	$return = {
	234	type => 'field',
	235	name => $item{'field_name'},
	236	data_type => $item{'data_type'}{'type'},
	237	size => $item{'data_type'}{'size'},
	238	list => $item{'data_type'}{'list'},
	239	null => $null,
0efb6e1b	240	default => $default->{'value'},
0efb6e1b	241	constraints => [ @constraints ],
f2f71b8e	242	comments => [ @comments ],
4422e22a	243	}
	244	}
	245	\| <error>
	246
0efb6e1b	247	field_meta : default_val
	248	\|
	249	column_constraint
4422e22a	250
0efb6e1b	251	column_constraint : constraint_name(?) column_constraint_type deferrable(?) deferred(?)
	252	{
	253	my $desc = $item{'column_constraint_type'};
	254	my $type = $desc->{'type'};
	255	my $fields = $desc->{'fields'} \|\| [];
	256	my $expression = $desc->{'expression'} \|\| '';
	257
	258	$return = {
	259	meta_type => 'constraint',
	260	name => $item{'constraint_name'}[0] \|\| '',
	261	type => $type,
	262	expression => $type eq 'check' ? $expression : '',
	263	deferreable => $item{'deferrable'},
	264	deferred => $item{'deferred'},
	265	reference_table => $desc->{'reference_table'},
	266	reference_fields => $desc->{'reference_fields'},
	267	match_type => $desc->{'match_type'},
	268	on_delete_do => $desc->{'on_delete_do'},
	269	on_update_do => $desc->{'on_update_do'},
4422e22a	270	}
	271	}
	272
0efb6e1b	273	constraint_name : /constraint/i name_with_opt_quotes { $item[2] }
	274
	275	column_constraint_type : /not null/i { $return = { type => 'not_null' } }
	276	\|
	277	/null/
	278	{ $return = { type => 'null' } }
	279	\|
	280	/unique/
	281	{ $return = { type => 'unique' } }
	282	\|
	283	/primary key/i
	284	{ $return = { type => 'primary_key' } }
	285	\|
	286	/check/i '(' /[^)]+/ ')'
	287	{ $return = { type => 'check', expression => $item[2] } }
	288	\|
	289	/references/i table_name parens_value_list(?) match_type(?) on_delete_do(?) on_update_do(?)
	290	{
	291	$return = {
	292	type => 'foreign_key',
	293	reference_table => $item[2],
	294	reference_fields => $item[3],
	295	match_type => $item[4][0],
	296	on_delete_do => $item[5][0],
	297	on_update_do => $item[6][0],
ba1a1626	298	}
4422e22a	299	}
4422e22a	300
0efb6e1b	301	table_name : name_with_opt_quotes
4422e22a	302
0efb6e1b	303	field_name : name_with_opt_quotes
4422e22a	304
0efb6e1b	305	name_with_opt_quotes : double_quote(?) WORD double_quote(?) { $item[2] }
4422e22a	306
0efb6e1b	307	double_quote: /"/
4422e22a	308
0efb6e1b	309	index_name : WORD
4422e22a	310
0efb6e1b	311	data_type : pg_data_type parens_value_list(?)
4422e22a	312	{
4422e22a	313	my $type = $item[1];
ba1a1626	314
0efb6e1b	315	#
	316	# We can deduce some sizes from the data type's name.
	317	#
	318	my $size;
	319	if ( ref $type eq 'ARRAY' ) {
	320	$size = [ $type->[1] ];
	321	$type = $type->[0];
4422e22a	322	}
4422e22a	323	else {
0efb6e1b	324	$size = $item[2][0] \|\| '';
4422e22a	325	}
4422e22a	326
0efb6e1b	327	$return = {
	328	type => $type,
	329	size => $size,
4422e22a	330	}
	331	}
	332
0efb6e1b	333	pg_data_type :
	334	/(bigint\|int8\|bigserial\|serial8)/ { $return = [ 'integer', 8 ] }
	335	\|
	336	/(smallint\|int2)/ { $return = [ 'integer', 2 ] }
	337	\|
	338	/int(eger)?\|int4/ { $return = [ 'integer', 4 ] }
	339	\|
	340	/(double precision\|float8?)/ { $return = [ 'float', 8 ] }
	341	\|
	342	/(real\|float4)/ { $return = [ 'real', 4 ] }
	343	\|
	344	/serial4?/ { $return = [ 'serial', 4 ] }
	345	\|
	346	/bigserial/ { $return = [ 'serial', 8 ] }
	347	\|
	348	/(bit varying\|varbit)/ { $return = 'varbit' }
	349	\|
	350	/character varying/ { $return = 'varchar' }
	351	\|
	352	/char(acter)?/ { $return = 'char' }
	353	\|
	354	/bool(ean)?/ { $return = 'boolean' }
	355	\|
	356	/(bytea\|binary data)/ { $return = 'binary' }
	357	\|
	358	/timestampz?/ { $return = 'timestamp' }
	359	\|
	360	/(bit\|box\|cidr\|circle\|date\|inet\|interval\|line\|lseg\|macaddr\|money\|numeric\|decimal\|path\|point\|polygon\|text\|time\|varchar)/
	361	{ $item[1] }
	362
4422e22a	363	parens_value_list : '(' VALUE(s /,/) ')'
	364	{ $item[2] }
	365
0efb6e1b	366	parens_word_list : '(' WORD(s /,/) ')'
0efb6e1b	367	{ $item[2] }
4422e22a	368
0efb6e1b	369	field_size : '(' num_range ')' { $item{'num_range'} }
4422e22a	370
0efb6e1b	371	num_range : DIGITS ',' DIGITS
4422e22a	372	{ $return = $item[1].','.$item[3] }
	373	\| DIGITS
	374	{ $return = $item[1] }
	375
f2f71b8e	376	table_constraint : comment(s?) constraint_name(?) table_constraint_type deferrable(?) deferred(?) comment(s?)
0efb6e1b	377	{
	378	my $desc = $item{'table_constraint_type'};
	379	my $type = $desc->{'type'};
	380	my $fields = $desc->{'fields'};
	381	my $expression = $desc->{'expression'};
f2f71b8e	382	my @comments = ( @{ $item[1] }, @{ $item[-1] } );
0efb6e1b	383
	384	$return = {
	385	name => $item{'constraint_name'}[0] \|\| '',
	386	type => 'constraint',
	387	constraint_type => $type,
	388	fields => $type ne 'check' ? $fields : [],
	389	expression => $type eq 'check' ? $expression : '',
	390	deferreable => $item{'deferrable'},
	391	deferred => $item{'deferred'},
	392	reference_table => $desc->{'reference_table'},
	393	reference_fields => $desc->{'reference_fields'},
	394	match_type => $desc->{'match_type'}[0],
	395	on_delete_do => $desc->{'on_delete_do'}[0],
	396	on_update_do => $desc->{'on_update_do'}[0],
f2f71b8e	397	comments => [ @comments ],
0efb6e1b	398	}
0efb6e1b	399	}
4422e22a	400
0efb6e1b	401	table_constraint_type : /primary key/i '(' name_with_opt_quotes(s /,/) ')'
	402	{
	403	$return = {
	404	type => 'primary_key',
	405	fields => $item[3],
	406	}
	407	}
	408	\|
	409	/unique/i '(' name_with_opt_quotes(s /,/) ')'
	410	{
	411	$return = {
	412	type => 'unique',
	413	fields => $item[3],
	414	}
	415	}
	416	\|
	417	/check/ '(' /(.+)/ ')'
	418	{
	419	$return = {
	420	type => 'check',
	421	expression => $item[3],
	422	}
	423	}
	424	\|
	425	/foreign key/i '(' name_with_opt_quotes(s /,/) ')' /references/i table_name parens_word_list(?) match_type(?) on_delete_do(?) on_update_do(?)
	426	{
	427	$return = {
	428	type => 'foreign_key',
	429	fields => $item[3],
	430	reference_table => $item[6],
	431	reference_fields => $item[7][0],
	432	match_type => $item[8][0],
	433	on_delete_do => $item[9][0],
	434	on_update_do => $item[10][0],
	435	}
	436	}
	437
	438	deferrable : /not/i /deferrable/i
	439	{
	440	$return = ( $item[1] =~ /not/i ) ? 0 : 1;
	441	}
4422e22a	442
0efb6e1b	443	deferred : /initially/i /(deferred\|immediate)/i { $item[2] }
4422e22a	444
0efb6e1b	445	match_type : /match full/i { 'match_full' }
	446	\|
	447	/match partial/i { 'match_partial' }
	448
	449	on_delete_do : /on delete/i WORD
	450	{ $item[2] }
	451
	452	on_update_do : /on update/i WORD
	453	{ $item[2] }
	454
	455	create_table : /create/i /table/i
	456
	457	create_index : /create/i /index/i
4422e22a	458
	459	default_val : /default/i /(?:')?[\w\d.-]*(?:')?/
	460	{
0efb6e1b	461	my $val = $item[2] \|\| '';
	462	$val =~ s/'//g;
	463	$return = {
	464	meta_type => 'default',
	465	value => $val,
	466	}
4422e22a	467	}
4422e22a	468
0efb6e1b	469	auto_inc : /auto_increment/i { 1 }
4422e22a	470
	471	primary_key : /primary/i /key/i { 1 }
	472
4422e22a	473	name_with_opt_paren : NAME parens_value_list(s?)
0efb6e1b	474	{ $item[2][0] ? "$item[1]($item[2][0][0])" : $item[1] }
4422e22a	475
	476	unique : /unique/i { 1 }
	477
	478	key : /key/i \| /index/i
	479
0efb6e1b	480	table_option : /inherits/i '(' name_with_opt_quotes(s /,/) ')'
4422e22a	481	{
0efb6e1b	482	$return = { type => 'inherits', table_name => $item[3] }
	483	}
	484	\|
	485	/with(out)? oids/i
	486	{
	487	$return = { type => $item[1] =~ /out/i ? 'without_oids' : 'with_oids' }
4422e22a	488	}
4422e22a	489
0efb6e1b	490	SEMICOLON : /\s*;\n?/
0efb6e1b	491
4422e22a	492	WORD : /\w+/
	493
	494	DIGITS : /\d+/
	495
	496	COMMA : ','
	497
	498	NAME : "`" /\w+/ "`"
	499	{ $item[2] }
	500	\| /\w+/
	501	{ $item[1] }
	502
	503	VALUE : /[-+]?\.?\d+(?:[eE]\d+)?/
	504	{ $item[1] }
	505	\| /'.*?'/ # XXX doesn't handle embedded quotes
	506	{ $item[1] }
	507	\| /NULL/
	508	{ 'NULL' }
	509
	510	!;
	511
	512	# -------------------------------------------------------------------
	513	sub parse {
	514	my ( $translator, $data ) = @_;
	515	$parser \|\|= Parse::RecDescent->new($GRAMMAR);
	516
	517	$::RD_TRACE = $translator->trace ? 1 : undef;
	518	$DEBUG = $translator->debug;
	519
	520	unless (defined $parser) {
	521	return $translator->error("Error instantiating Parse::RecDescent ".
	522	"instance: Bad grammer");
	523	}
	524
	525	my $result = $parser->startrule($data);
	526	die "Parse failed.\n" unless defined $result;
	527	warn Dumper($result) if $DEBUG;
	528	return $result;
	529	}
	530
	531	1;
	532
	533	#-----------------------------------------------------
	534	# Where man is not nature is barren.
	535	# William Blake
	536	#-----------------------------------------------------
	537
	538	=pod
	539
0efb6e1b	540	=head1 AUTHORS
4422e22a	541
4422e22a	542	Ken Y. Clark E<lt>kclark@cpan.orgE<gt>,
0efb6e1b	543	Allen Day <allenday@users.sourceforge.net>.
4422e22a	544
	545	=head1 SEE ALSO
	546
	547	perl(1), Parse::RecDescent.
	548
	549	=cut