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

package SQL::Translator::Parser::SQLite;

# -------------------------------------------------------------------
# $Id$
# -------------------------------------------------------------------
# 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
# 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::SQLite - parser for SQLite

=head1 SYNOPSIS

  use SQL::Translator;
  use SQL::Translator::Parser::SQLite;

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

=head1 DESCRIPTION

This is a grammar for parsing CREATE statements for SQLite as 
described here:

    http://www.sqlite.org/lang.html

CREATE INDEX

sql-statement ::=
    CREATE [TEMP | TEMPORARY] [UNIQUE] INDEX index-name 
     ON [database-name .] table-name ( column-name [, column-name]* )
     [ ON CONFLICT conflict-algorithm ]

column-name ::=
    name [ ASC | DESC ]

CREATE TABLE

sql-command ::=
    CREATE [TEMP | TEMPORARY] TABLE table-name (
        column-def [, column-def]*
        [, constraint]*
     )

sql-command ::=
    CREATE [TEMP | TEMPORARY] TABLE table-name AS select-statement

column-def ::=
    name [type] [[CONSTRAINT name] column-constraint]*

type ::=
    typename |
     typename ( number ) |
     typename ( number , number )

column-constraint ::=
    NOT NULL [ conflict-clause ] |
    PRIMARY KEY [sort-order] [ conflict-clause ] |
    UNIQUE [ conflict-clause ] |
    CHECK ( expr ) [ conflict-clause ] |
    DEFAULT value

constraint ::=
    PRIMARY KEY ( name [, name]* ) [ conflict-clause ]|
    UNIQUE ( name [, name]* ) [ conflict-clause ] |
    CHECK ( expr ) [ conflict-clause ]

conflict-clause ::=
    ON CONFLICT conflict-algorithm

CREATE TRIGGER

sql-statement ::=
    CREATE [TEMP | TEMPORARY] TRIGGER trigger-name [ BEFORE | AFTER ]
    database-event ON [database-name .] table-name
    trigger-action

sql-statement ::=
    CREATE [TEMP | TEMPORARY] TRIGGER trigger-name INSTEAD OF
    database-event ON [database-name .] view-name
    trigger-action

database-event ::=
    DELETE | 
    INSERT | 
    UPDATE | 
    UPDATE OF column-list

trigger-action ::=
    [ FOR EACH ROW | FOR EACH STATEMENT ] [ WHEN expression ] 
        BEGIN 
            trigger-step ; [ trigger-step ; ]*
        END

trigger-step ::=
    update-statement | insert-statement | 
    delete-statement | select-statement

CREATE VIEW

sql-command ::=
    CREATE [TEMP | TEMPORARY] VIEW view-name AS select-statement

ON CONFLICT clause

    conflict-clause ::=
    ON CONFLICT conflict-algorithm

    conflict-algorithm ::=
    ROLLBACK | ABORT | FAIL | IGNORE | REPLACE

expression

expr ::=
    expr binary-op expr |
    expr like-op expr |
    unary-op expr |
    ( expr ) |
    column-name |
    table-name . column-name |
    database-name . table-name . column-name |
    literal-value |
    function-name ( expr-list | * ) |
    expr (+) |
    expr ISNULL |
    expr NOTNULL |
    expr [NOT] BETWEEN expr AND expr |
    expr [NOT] IN ( value-list ) |
    expr [NOT] IN ( select-statement ) |
    ( select-statement ) |
    CASE [expr] ( WHEN expr THEN expr )+ [ELSE expr] END

like-op::=
    LIKE | GLOB | NOT LIKE | NOT GLOB

=cut

use strict;
use vars qw[ $DEBUG $GRAMMAR @EXPORT_OK ];
$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.

$GRAMMAR = q!

{ 
    my ( %tables, $table_order, @table_comments, @views, @triggers );
}

#
# 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 { 
    $return      = {
        tables   => \%tables, 
        views    => \@views,
        triggers => \@triggers,
    }
}

eofile : /^\Z/

statement : begin_transaction
    | commit
    | drop
    | comment
    | create
    | <error>

begin_transaction : /begin transaction/i SEMICOLON

commit : /commit/i SEMICOLON

drop : /drop/i TABLE <commit> table_name SEMICOLON

comment : /^\s*(?:#|-{2}).*\n/
    {
        my $comment =  $item[1];
        $comment    =~ s/^\s*(#|-{2})\s*//;
        $comment    =~ s/\s*$//;
        $return     = $comment;
    }

comment : /\/\*/ /[^\*]+/ /\*\// 
    {
        my $comment = $item[2];
        $comment    =~ s/^\s*|\s*$//g;
        $return = $comment;
    }

#
# Create Index
#
create : CREATE TEMPORARY(?) UNIQUE(?) INDEX WORD ON table_name parens_field_list conflict_clause(?) SEMICOLON
    {
        my $db_name    = $item[7]->{'db_name'} || '';
        my $table_name = $item[7]->{'name'};

        my $index        =  { 
            name         => $item[5],
            fields       => $item[8],
            on_conflict  => $item[9][0],
            is_temporary => $item[2][0] ? 1 : 0,
        };

        my $is_unique = $item[3][0];

        if ( $is_unique ) {
            $index->{'type'} = 'unique';
            push @{ $tables{ $table_name }{'constraints'} }, $index;
        }
        else {
            push @{ $tables{ $table_name }{'indices'} }, $index;
        }
    }

#
# Create Table
#
create : CREATE TEMPORARY(?) TABLE table_name '(' definition(s /,/) ')' SEMICOLON
    {
        my $db_name    = $item[4]->{'db_name'} || '';
        my $table_name = $item[4]->{'name'};

        $tables{ $table_name }{'name'}         = $table_name;
        $tables{ $table_name }{'is_temporary'} = $item[2][0] ? 1 : 0;
        $tables{ $table_name }{'order'}        = ++$table_order;

        for my $def ( @{ $item[6] } ) {
            if ( $def->{'supertype'} eq 'column' ) {
                push @{ $tables{ $table_name }{'fields'} }, $def;
            }
            elsif ( $def->{'supertype'} eq 'constraint' ) {
                push @{ $tables{ $table_name }{'constraints'} }, $def;
            }
        }
    }

definition : constraint_def | column_def 

column_def: NAME type(?) column_constraint(s?)
    {
        my $column = {
            supertype      => 'column',
            name           => $item[1],  
            data_type      => $item[2][0]->{'type'},
            size           => $item[2][0]->{'size'},
            is_nullable    => 1,
            is_primary_key => 0,
            is_unique      => 0,
            check          => '',
            default        => undef,
            constraints    => $item[3],
        };

        for my $c ( @{ $item[3] } ) {
            if ( $c->{'type'} eq 'not_null' ) {
                $column->{'is_nullable'} = 0;
            }
            elsif ( $c->{'type'} eq 'primary_key' ) {
                $column->{'is_primary_key'} = 1;
            }
            elsif ( $c->{'type'} eq 'unique' ) {
                $column->{'is_unique'} = 1;
            }
            elsif ( $c->{'type'} eq 'check' ) {
                $column->{'check'} = $c->{'expression'};
            }
            elsif ( $c->{'type'} eq 'default' ) {
                $column->{'default'} = $c->{'value'};
            }
        }

        $column;
    }

type : WORD parens_value_list(?)
    {
        $return = {
            type => $item[1],
            size => $item[2][0],
        }
    }

column_constraint : NOT_NULL conflict_clause(?)
    {
        $return = {
            type => 'not_null',
        }
    }
    |
    PRIMARY_KEY sort_order(?) conflict_clause(?)
    {
        $return = {
            type        => 'primary_key',
            sort_order  => $item[2][0],
            on_conflict => $item[2][0], 
        }
    }
    |
    UNIQUE conflict_clause(?)
    {
        $return = {
            type        => 'unique',
            on_conflict => $item[2][0], 
        }
    }
    |
    CHECK_C '(' expr ')' conflict_clause(?)
    {
        $return = {
            type        => 'check',
            expression  => $item[3],
            on_conflict => $item[5][0], 
        }
    }
    |
    DEFAULT VALUE
    {
        $return   = {
            type  => 'default',
            value => $item[2],
        }
    }

constraint_def : PRIMARY_KEY parens_field_list conflict_clause(?)
    {
        $return         = {
            supertype   => 'constraint',
            type        => 'primary_key',
            fields      => $item[2],
            on_conflict => $item[3][0],
        }
    }
    |
    UNIQUE parens_field_list conflict_clause(?)
    {
        $return         = {
            supertype   => 'constraint',
            type        => 'unique',
            fields      => $item[2],
            on_conflict => $item[3][0],
        }
    }
    |
    CHECK_C '(' expr ')' conflict_clause(?)
    {
        $return         = {
            supertype   => 'constraint',
            type        => 'check',
            expression  => $item[3],
            on_conflict => $item[5][0],
        }
    }

table_name : qualified_name
    
qualified_name : NAME 
    { $return = { name => $item[1] } }

qualified_name : /(\w+)\.(\w+)/ 
    { $return = { db_name => $1, name => $2 } }

field_name : NAME

conflict_clause : /on conflict/i conflict_algorigthm

conflict_algorigthm : /(rollback|abort|fail|ignore|replace)/i

parens_field_list : '(' column_list ')'
    { $item[2] }

column_list : field_name(s /,/)

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

expr : /[^)]+/

sort_order : /(ASC|DESC)/i

#
# Create Trigger

create : CREATE TEMPORARY(?) TRIGGER NAME before_or_after(?) database_event ON table_name trigger_action SEMICOLON
    {
        my $table_name = $item[8]->{'name'};
        push @triggers, {
            name         => $item[4],
            is_temporary => $item[2][0] ? 1 : 0,
            when         => $item[5][0],
            instead_of   => 0,
            db_event     => $item[6],
            action       => $item[9],
            on_table     => $table_name,
        }
    }

create : CREATE TEMPORARY(?) TRIGGER NAME instead_of database_event ON view_name trigger_action
    {
        my $table_name = $item[8]->{'name'};
        push @triggers, {
            name         => $item[4],
            is_temporary => $item[2][0] ? 1 : 0,
            when         => undef,
            instead_of   => 1,
            db_event     => $item[6],
            action       => $item[9],
            on_table     => $table_name,
        }
    }

database_event : /(delete|insert|update)/i

database_event : /update of/i column_list

trigger_action : for_each(?) when(?) BEGIN_C trigger_step(s) END_C
    {
        $return = {
            for_each => $item[1][0],
            when     => $item[2][0],
            steps    => $item[4],
        }
    }

for_each : /FOR EACH ROW/i | /FOR EACH STATEMENT/i

when : WHEN expr { $item[2] }

string :
   /'(\\.|''|[^\\\'])*'/ 

nonstring : /[^;\'"]+/

statement_body : (string | nonstring)(s?)

trigger_step : /(select|delete|insert|update)/i statement_body SEMICOLON
    {
        $return = join( ' ', $item[1], join ' ', @{ $item[2] || [] } )
    }   

before_or_after : /(before|after)/i { $return = lc $1 }

instead_of : /instead of/i

view_name : qualified_name

#
# Create View
#
create : CREATE TEMPORARY(?) VIEW view_name AS select_statement 
    {
        push @views, {
            name         => $item[4]->{'name'},
            sql          => $item[6], 
            is_temporary => $item[2][0] ? 1 : 0,
        }
    }

select_statement : SELECT /[^;]+/ SEMICOLON
    {
        $return = join( ' ', $item[1], $item[2] );
    }

#
# Tokens
#
BEGIN_C : /begin/i

END_C : /end/i

CREATE : /create/i

TEMPORARY : /temp(orary)?/i { 1 }

TABLE : /table/i

INDEX : /index/i

NOT_NULL : /not null/i

PRIMARY_KEY : /primary key/i

CHECK_C : /check/i

DEFAULT : /default/i

TRIGGER : /trigger/i

VIEW : /view/i

SELECT : /select/i

ON : /on/i

AS : /as/i

WORD : /\w+/

WHEN : /when/i

UNIQUE : /unique/i { 1 }

SEMICOLON : ';'

NAME : /'?(\w+)'?/ { $return = $1 }

VALUE : /[-+]?\.?\d+(?:[eE]\d+)?/
    { $item[1] }
    | /'.*?'/   
    { 
        # remove leading/trailing quotes 
        my $val = $item[1];
        $val    =~ s/^['"]|['"]$//g;
        $return = $val;
    }
    | /NULL/
    { 'NULL' }
    | /CURRENT_TIMESTAMP/i
    { 'CURRENT_TIMESTAMP' }

!;

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

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

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

    my $result = $parser->startrule($data);
    return $translator->error( "Parse failed." ) unless defined $result;
    warn Dumper( $result ) if $DEBUG;

    my $schema = $translator->schema;
    my @tables = 
        map   { $_->[1] }
        sort  { $a->[0] <=> $b->[0] } 
        map   { [ $result->{'tables'}{ $_ }->{'order'}, $_ ] }
        keys %{ $result->{'tables'} };

    for my $table_name ( @tables ) {
        my $tdata =  $result->{'tables'}{ $table_name };
        my $table =  $schema->add_table( 
            name  => $tdata->{'name'},
        ) or die $schema->error;

        $table->comments( $tdata->{'comments'} );

        for my $fdata ( @{ $tdata->{'fields'} } ) {
            my $field = $table->add_field(
                name              => $fdata->{'name'},
                data_type         => $fdata->{'data_type'},
                size              => $fdata->{'size'},
                default_value     => $fdata->{'default'},
                is_auto_increment => $fdata->{'is_auto_inc'},
                is_nullable       => $fdata->{'is_nullable'},
                comments          => $fdata->{'comments'},
            ) or die $table->error;

            $table->primary_key( $field->name ) if $fdata->{'is_primary_key'};

            for my $cdata ( @{ $fdata->{'constraints'} } ) {
                next unless $cdata->{'type'} eq 'foreign_key';
                $cdata->{'fields'} ||= [ $field->name ];
                push @{ $tdata->{'constraints'} }, $cdata;
            }
        }

        for my $idata ( @{ $tdata->{'indices'} || [] } ) {
            my $index  =  $table->add_index(
                name   => $idata->{'name'},
                type   => uc $idata->{'type'},
                fields => $idata->{'fields'},
            ) or die $table->error;
        }

        for my $cdata ( @{ $tdata->{'constraints'} || [] } ) {
            my $constraint       =  $table->add_constraint(
                name             => $cdata->{'name'},
                type             => $cdata->{'type'},
                fields           => $cdata->{'fields'},
                reference_table  => $cdata->{'reference_table'},
                reference_fields => $cdata->{'reference_fields'},
                match_type       => $cdata->{'match_type'} || '',
                on_delete        => $cdata->{'on_delete'} || $cdata->{'on_delete_do'},
                on_update        => $cdata->{'on_update'} || $cdata->{'on_update_do'},
            ) or die $table->error;
        }
    }

    for my $def ( @{ $result->{'views'} || [] } ) {
        my $view = $schema->add_view(
            name => $def->{'name'},
            sql  => $def->{'sql'},
        );
    }

    for my $def ( @{ $result->{'triggers'} || [] } ) {
        my $view                = $schema->add_trigger(
            name                => $def->{'name'},
            perform_action_when => $def->{'when'},
            database_event      => $def->{'db_event'},
            action              => $def->{'action'},
            on_table            => $def->{'on_table'},
        );
    }

    return 1;
}

1;

# -------------------------------------------------------------------
# All wholsome food is caught without a net or a trap.
# William Blake
# -------------------------------------------------------------------

=pod

=head1 AUTHOR

Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.

=head1 SEE ALSO

perl(1), Parse::RecDescent, SQL::Translator::Schema.

=cut
Commit	Line	Data
72aa2647	1	package SQL::Translator::Parser::SQLite;
	2
	3	# -------------------------------------------------------------------
821a0fde	4	# $Id$
72aa2647	5	# -------------------------------------------------------------------
478f608d	6	# Copyright (C) 2002-2009 SQLFairy Authors
72aa2647	7	#
	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.
	11	#
	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.
	16	#
	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
	20	# 02111-1307 USA
	21	# -------------------------------------------------------------------
	22
	23	=head1 NAME
	24
	25	SQL::Translator::Parser::SQLite - parser for SQLite
	26
	27	=head1 SYNOPSIS
	28
	29	use SQL::Translator;
	30	use SQL::Translator::Parser::SQLite;
	31
	32	my $translator = SQL::Translator->new;
	33	$translator->parser("SQL::Translator::Parser::SQLite");
	34
	35	=head1 DESCRIPTION
	36
	37	This is a grammar for parsing CREATE statements for SQLite as
	38	described here:
	39
	40	http://www.sqlite.org/lang.html
	41
	42	CREATE INDEX
	43
	44	sql-statement ::=
	45	CREATE [TEMP \| TEMPORARY] [UNIQUE] INDEX index-name
	46	ON [database-name .] table-name ( column-name [, column-name]* )
	47	[ ON CONFLICT conflict-algorithm ]
	48
	49	column-name ::=
	50	name [ ASC \| DESC ]
	51
	52	CREATE TABLE
	53
	54	sql-command ::=
	55	CREATE [TEMP \| TEMPORARY] TABLE table-name (
	56	column-def [, column-def]*
	57	[, constraint]*
	58	)
	59
	60	sql-command ::=
	61	CREATE [TEMP \| TEMPORARY] TABLE table-name AS select-statement
	62
	63	column-def ::=
	64	name [type] [[CONSTRAINT name] column-constraint]*
	65
	66	type ::=
	67	typename \|
	68	typename ( number ) \|
	69	typename ( number , number )
	70
71	column-constraint ::=
72	NOT NULL [ conflict-clause ] \|
73	PRIMARY KEY [sort-order] [ conflict-clause ] \|
74	UNIQUE [ conflict-clause ] \|
75	CHECK ( expr ) [ conflict-clause ] \|
76	DEFAULT value
77
78	constraint ::=
79	PRIMARY KEY ( name [, name]* ) [ conflict-clause ]\|
80	UNIQUE ( name [, name]* ) [ conflict-clause ] \|
81	CHECK ( expr ) [ conflict-clause ]
82
83	conflict-clause ::=
84	ON CONFLICT conflict-algorithm
85
86	CREATE TRIGGER
87
88	sql-statement ::=
89	CREATE [TEMP \| TEMPORARY] TRIGGER trigger-name [ BEFORE \| AFTER ]
90	database-event ON [database-name .] table-name
91	trigger-action
92
93	sql-statement ::=
94	CREATE [TEMP \| TEMPORARY] TRIGGER trigger-name INSTEAD OF
95	database-event ON [database-name .] view-name
96	trigger-action
97
98	database-event ::=
99	DELETE \|
100	INSERT \|
101	UPDATE \|
102	UPDATE OF column-list
103
104	trigger-action ::=
105	[ FOR EACH ROW \| FOR EACH STATEMENT ] [ WHEN expression ]
106	BEGIN
107	trigger-step ; [ trigger-step ; ]*
108	END
109
110	trigger-step ::=
111	update-statement \| insert-statement \|
51af147e	112	delete-statement \| select-statement
72aa2647	113
	114	CREATE VIEW
	115
	116	sql-command ::=
	117	CREATE [TEMP \| TEMPORARY] VIEW view-name AS select-statement
	118
	119	ON CONFLICT clause
	120
	121	conflict-clause ::=
	122	ON CONFLICT conflict-algorithm
	123
	124	conflict-algorithm ::=
	125	ROLLBACK \| ABORT \| FAIL \| IGNORE \| REPLACE
	126
	127	expression
	128
	129	expr ::=
	130	expr binary-op expr \|
	131	expr like-op expr \|
	132	unary-op expr \|
	133	( expr ) \|
	134	column-name \|
	135	table-name . column-name \|
	136	database-name . table-name . column-name \|
	137	literal-value \|
	138	function-name ( expr-list \| * ) \|
	139	expr (+) \|
	140	expr ISNULL \|
	141	expr NOTNULL \|
	142	expr [NOT] BETWEEN expr AND expr \|
	143	expr [NOT] IN ( value-list ) \|
	144	expr [NOT] IN ( select-statement ) \|
	145	( select-statement ) \|
	146	CASE [expr] ( WHEN expr THEN expr )+ [ELSE expr] END
	147
	148	like-op::=
	149	LIKE \| GLOB \| NOT LIKE \| NOT GLOB
	150
	151	=cut
	152
	153	use strict;
478f608d	154	use vars qw[ $DEBUG $GRAMMAR @EXPORT_OK ];
72aa2647	155	$DEBUG = 0 unless defined $DEBUG;
	156
	157	use Data::Dumper;
	158	use Parse::RecDescent;
	159	use Exporter;
	160	use base qw(Exporter);
	161
	162	@EXPORT_OK = qw(parse);
	163
	164	# Enable warnings within the Parse::RecDescent module.
	165	$::RD_ERRORS = 1; # Make sure the parser dies when it encounters an error
	166	$::RD_WARN = 1; # Enable warnings. This will warn on unused rules &c.
	167	$::RD_HINT = 1; # Give out hints to help fix problems.
	168
	169	$GRAMMAR = q!
	170
	171	{
70698e1c	172	my ( %tables, $table_order, @table_comments, @views, @triggers );
72aa2647	173	}
	174
	175	#
	176	# The "eofile" rule makes the parser fail if any "statement" rule
	177	# fails. Otherwise, the first successful match by a "statement"
	178	# won't cause the failure needed to know that the parse, as a whole,
	179	# failed. -ky
	180	#
70698e1c	181	startrule : statement(s) eofile {
8c12c406	182	$return = {
70698e1c	183	tables => \%tables,
	184	views => \@views,
	185	triggers => \@triggers,
	186	}
	187	}
72aa2647	188
	189	eofile : /^\Z/
	190
	191	statement : begin_transaction
	192	\| commit
ac9c4e2e	193	\| drop
72aa2647	194	\| comment
	195	\| create
	196	\| <error>
	197
	198	begin_transaction : /begin transaction/i SEMICOLON
	199
	200	commit : /commit/i SEMICOLON
	201
ac9c4e2e	202	drop : /drop/i TABLE <commit> table_name SEMICOLON
ac9c4e2e	203
72aa2647	204	comment : /^\s(?:#\|-{2}).\n/
	205	{
	206	my $comment = $item[1];
	207	$comment =~ s/^\s(#\|-{2})\s//;
	208	$comment =~ s/\s*$//;
	209	$return = $comment;
	210	}
	211
	212	comment : /\/\/ /[^\]+/ /\*\//
	213	{
	214	my $comment = $item[2];
	215	$comment =~ s/^\s\|\s$//g;
	216	$return = $comment;
	217	}
	218
	219	#
	220	# Create Index
	221	#
	222	create : CREATE TEMPORARY(?) UNIQUE(?) INDEX WORD ON table_name parens_field_list conflict_clause(?) SEMICOLON
	223	{
	224	my $db_name = $item[7]->{'db_name'} \|\| '';
	225	my $table_name = $item[7]->{'name'};
	226
	227	my $index = {
	228	name => $item[5],
	229	fields => $item[8],
	230	on_conflict => $item[9][0],
	231	is_temporary => $item[2][0] ? 1 : 0,
	232	};
	233
	234	my $is_unique = $item[3][0];
	235
	236	if ( $is_unique ) {
	237	$index->{'type'} = 'unique';
	238	push @{ $tables{ $table_name }{'constraints'} }, $index;
	239	}
	240	else {
	241	push @{ $tables{ $table_name }{'indices'} }, $index;
	242	}
	243	}
	244
	245	#
	246	# Create Table
	247	#
	248	create : CREATE TEMPORARY(?) TABLE table_name '(' definition(s /,/) ')' SEMICOLON
	249	{
	250	my $db_name = $item[4]->{'db_name'} \|\| '';
	251	my $table_name = $item[4]->{'name'};
	252
	253	$tables{ $table_name }{'name'} = $table_name;
	254	$tables{ $table_name }{'is_temporary'} = $item[2][0] ? 1 : 0;
	255	$tables{ $table_name }{'order'} = ++$table_order;
	256
	257	for my $def ( @{ $item[6] } ) {
	258	if ( $def->{'supertype'} eq 'column' ) {
	259	push @{ $tables{ $table_name }{'fields'} }, $def;
	260	}
	261	elsif ( $def->{'supertype'} eq 'constraint' ) {
	262	push @{ $tables{ $table_name }{'constraints'} }, $def;
	263	}
	264	}
	265	}
	266
	267	definition : constraint_def \| column_def
268
269	column_def: NAME type(?) column_constraint(s?)
270	{
271	my $column = {
272	supertype => 'column',
273	name => $item[1],
274	data_type => $item[2][0]->{'type'},
275	size => $item[2][0]->{'size'},
276	is_nullable => 1,
277	is_primary_key => 0,
278	is_unique => 0,
279	check => '',
280	default => undef,
281	constraints => $item[3],
282	};
283
284	for my $c ( @{ $item[3] } ) {
285	if ( $c->{'type'} eq 'not_null' ) {
286	$column->{'is_nullable'} = 0;
287	}
288	elsif ( $c->{'type'} eq 'primary_key' ) {
289	$column->{'is_primary_key'} = 1;
290	}
291	elsif ( $c->{'type'} eq 'unique' ) {
292	$column->{'is_unique'} = 1;
293	}
294	elsif ( $c->{'type'} eq 'check' ) {
295	$column->{'check'} = $c->{'expression'};
296	}
297	elsif ( $c->{'type'} eq 'default' ) {
298	$column->{'default'} = $c->{'value'};
299	}
300	}
301
302	$column;
303	}
304
305	type : WORD parens_value_list(?)
306	{
307	$return = {
308	type => $item[1],
309	size => $item[2][0],
310	}
311	}
312
313	column_constraint : NOT_NULL conflict_clause(?)
314	{
315	$return = {
316	type => 'not_null',
317	}
318	}
319	\|
320	PRIMARY_KEY sort_order(?) conflict_clause(?)
321	{
322	$return = {
323	type => 'primary_key',
324	sort_order => $item[2][0],
325	on_conflict => $item[2][0],
326	}
327	}
328	\|
329	UNIQUE conflict_clause(?)
330	{
331	$return = {
332	type => 'unique',
333	on_conflict => $item[2][0],
334	}
335	}
336	\|
337	CHECK_C '(' expr ')' conflict_clause(?)
338	{
339	$return = {
340	type => 'check',
341	expression => $item[3],
342	on_conflict => $item[5][0],
343	}
344	}
345	\|
346	DEFAULT VALUE
347	{
348	$return = {
349	type => 'default',
350	value => $item[2],
351	}
352	}
353
354	constraint_def : PRIMARY_KEY parens_field_list conflict_clause(?)
355	{
356	$return = {
357	supertype => 'constraint',
358	type => 'primary_key',
359	fields => $item[2],
360	on_conflict => $item[3][0],
361	}
362	}
363	\|
364	UNIQUE parens_field_list conflict_clause(?)
365	{
366	$return = {
367	supertype => 'constraint',
368	type => 'unique',
369	fields => $item[2],
370	on_conflict => $item[3][0],
371	}
372	}
373	\|
374	CHECK_C '(' expr ')' conflict_clause(?)
375	{
376	$return = {
377	supertype => 'constraint',
378	type => 'check',
379	expression => $item[3],
380	on_conflict => $item[5][0],
381	}
382	}
383
384	table_name : qualified_name
385
386	qualified_name : NAME
387	{ $return = { name => $item[1] } }
388
389	qualified_name : /(\w+)\.(\w+)/
390	{ $return = { db_name => $1, name => $2 } }
391
392	field_name : NAME
393
394	conflict_clause : /on conflict/i conflict_algorigthm
395
396	conflict_algorigthm : /(rollback\|abort\|fail\|ignore\|replace)/i
397
398	parens_field_list : '(' column_list ')'
399	{ $item[2] }
400
401	column_list : field_name(s /,/)
402
403	parens_value_list : '(' VALUE(s /,/) ')'
404	{ $item[2] }
405
406	expr : /[^)]+/
407
408	sort_order : /(ASC\|DESC)/i
409
410	#
411	# Create Trigger
412
2661d702	413	create : CREATE TEMPORARY(?) TRIGGER NAME before_or_after(?) database_event ON table_name trigger_action SEMICOLON
72aa2647	414	{
72aa2647	415	my $table_name = $item[8]->{'name'};
70698e1c	416	push @triggers, {
72aa2647	417	name => $item[4],
	418	is_temporary => $item[2][0] ? 1 : 0,
	419	when => $item[5][0],
	420	instead_of => 0,
	421	db_event => $item[6],
	422	action => $item[9],
da2f5992	423	on_table => $table_name,
72aa2647	424	}
	425	}
	426
	427	create : CREATE TEMPORARY(?) TRIGGER NAME instead_of database_event ON view_name trigger_action
	428	{
	429	my $table_name = $item[8]->{'name'};
70698e1c	430	push @triggers, {
72aa2647	431	name => $item[4],
	432	is_temporary => $item[2][0] ? 1 : 0,
	433	when => undef,
	434	instead_of => 1,
	435	db_event => $item[6],
	436	action => $item[9],
da2f5992	437	on_table => $table_name,
72aa2647	438	}
	439	}
	440
	441	database_event : /(delete\|insert\|update)/i
	442
	443	database_event : /update of/i column_list
	444
	445	trigger_action : for_each(?) when(?) BEGIN_C trigger_step(s) END_C
	446	{
	447	$return = {
	448	for_each => $item[1][0],
	449	when => $item[2][0],
	450	steps => $item[4],
	451	}
	452	}
	453
	454	for_each : /FOR EACH ROW/i \| /FOR EACH STATEMENT/i
	455
	456	when : WHEN expr { $item[2] }
	457
9bf756df	458	string :
	459	/'(\\.\|''\|[^\\\'])*'/
	460
	461	nonstring : /[^;\'"]+/
	462
	463	statement_body : (string \| nonstring)(s?)
	464
	465	trigger_step : /(select\|delete\|insert\|update)/i statement_body SEMICOLON
72aa2647	466	{
67a1819d	467	$return = join( ' ', $item[1], join ' ', @{ $item[2] \|\| [] } )
72aa2647	468	}
	469
	470	before_or_after : /(before\|after)/i { $return = lc $1 }
	471
	472	instead_of : /instead of/i
	473
	474	view_name : qualified_name
	475
	476	#
70698e1c	477	# Create View
	478	#
	479	create : CREATE TEMPORARY(?) VIEW view_name AS select_statement
	480	{
	481	push @views, {
	482	name => $item[4]->{'name'},
	483	sql => $item[6],
	484	is_temporary => $item[2][0] ? 1 : 0,
	485	}
	486	}
	487
	488	select_statement : SELECT /[^;]+/ SEMICOLON
	489	{
	490	$return = join( ' ', $item[1], $item[2] );
	491	}
	492
	493	#
72aa2647	494	# Tokens
	495	#
	496	BEGIN_C : /begin/i
	497
	498	END_C : /end/i
	499
	500	CREATE : /create/i
	501
	502	TEMPORARY : /temp(orary)?/i { 1 }
	503
	504	TABLE : /table/i
	505
	506	INDEX : /index/i
	507
	508	NOT_NULL : /not null/i
	509
	510	PRIMARY_KEY : /primary key/i
	511
	512	CHECK_C : /check/i
	513
	514	DEFAULT : /default/i
	515
	516	TRIGGER : /trigger/i
	517
70698e1c	518	VIEW : /view/i
	519
	520	SELECT : /select/i
	521
72aa2647	522	ON : /on/i
72aa2647	523
70698e1c	524	AS : /as/i
70698e1c	525
72aa2647	526	WORD : /\w+/
	527
	528	WHEN : /when/i
	529
	530	UNIQUE : /unique/i { 1 }
	531
	532	SEMICOLON : ';'
	533
70698e1c	534	NAME : /'?(\w+)'?/ { $return = $1 }
72aa2647	535
70698e1c	536	VALUE : /[-+]?\.?\d+(?:[eE]\d+)?/
72aa2647	537	{ $item[1] }
	538	\| /'.*?'/
	539	{
	540	# remove leading/trailing quotes
	541	my $val = $item[1];
	542	$val =~ s/^['"]\|['"]$//g;
	543	$return = $val;
	544	}
	545	\| /NULL/
	546	{ 'NULL' }
ac9c4e2e	547	\| /CURRENT_TIMESTAMP/i
ac9c4e2e	548	{ 'CURRENT_TIMESTAMP' }
72aa2647	549
	550	!;
	551
	552	# -------------------------------------------------------------------
	553	sub parse {
	554	my ( $translator, $data ) = @_;
	555	my $parser = Parse::RecDescent->new($GRAMMAR);
	556
	557	local $::RD_TRACE = $translator->trace ? 1 : undef;
	558	local $DEBUG = $translator->debug;
	559
	560	unless (defined $parser) {
	561	return $translator->error("Error instantiating Parse::RecDescent ".
	562	"instance: Bad grammer");
	563	}
	564
	565	my $result = $parser->startrule($data);
	566	return $translator->error( "Parse failed." ) unless defined $result;
	567	warn Dumper( $result ) if $DEBUG;
	568
	569	my $schema = $translator->schema;
b727fc08	570	my @tables =
	571	map { $_->[1] }
	572	sort { $a->[0] <=> $b->[0] }
	573	map { [ $result->{'tables'}{ $_ }->{'order'}, $_ ] }
	574	keys %{ $result->{'tables'} };
72aa2647	575
72aa2647	576	for my $table_name ( @tables ) {
70698e1c	577	my $tdata = $result->{'tables'}{ $table_name };
72aa2647	578	my $table = $schema->add_table(
	579	name => $tdata->{'name'},
	580	) or die $schema->error;
	581
	582	$table->comments( $tdata->{'comments'} );
	583
	584	for my $fdata ( @{ $tdata->{'fields'} } ) {
	585	my $field = $table->add_field(
	586	name => $fdata->{'name'},
	587	data_type => $fdata->{'data_type'},
	588	size => $fdata->{'size'},
	589	default_value => $fdata->{'default'},
	590	is_auto_increment => $fdata->{'is_auto_inc'},
	591	is_nullable => $fdata->{'is_nullable'},
	592	comments => $fdata->{'comments'},
	593	) or die $table->error;
	594
	595	$table->primary_key( $field->name ) if $fdata->{'is_primary_key'};
	596
	597	for my $cdata ( @{ $fdata->{'constraints'} } ) {
	598	next unless $cdata->{'type'} eq 'foreign_key';
	599	$cdata->{'fields'} \|\|= [ $field->name ];
	600	push @{ $tdata->{'constraints'} }, $cdata;
	601	}
	602	}
	603
	604	for my $idata ( @{ $tdata->{'indices'} \|\| [] } ) {
	605	my $index = $table->add_index(
	606	name => $idata->{'name'},
	607	type => uc $idata->{'type'},
	608	fields => $idata->{'fields'},
	609	) or die $table->error;
	610	}
	611
	612	for my $cdata ( @{ $tdata->{'constraints'} \|\| [] } ) {
	613	my $constraint = $table->add_constraint(
	614	name => $cdata->{'name'},
	615	type => $cdata->{'type'},
	616	fields => $cdata->{'fields'},
	617	reference_table => $cdata->{'reference_table'},
	618	reference_fields => $cdata->{'reference_fields'},
	619	match_type => $cdata->{'match_type'} \|\| '',
100684f3	620	on_delete => $cdata->{'on_delete'} \|\| $cdata->{'on_delete_do'},
100684f3	621	on_update => $cdata->{'on_update'} \|\| $cdata->{'on_update_do'},
72aa2647	622	) or die $table->error;
	623	}
	624	}
	625
70698e1c	626	for my $def ( @{ $result->{'views'} \|\| [] } ) {
	627	my $view = $schema->add_view(
	628	name => $def->{'name'},
	629	sql => $def->{'sql'},
	630	);
	631	}
	632
	633	for my $def ( @{ $result->{'triggers'} \|\| [] } ) {
	634	my $view = $schema->add_trigger(
	635	name => $def->{'name'},
	636	perform_action_when => $def->{'when'},
	637	database_event => $def->{'db_event'},
	638	action => $def->{'action'},
da2f5992	639	on_table => $def->{'on_table'},
70698e1c	640	);
	641	}
	642
72aa2647	643	return 1;
	644	}
	645
	646	1;
	647
	648	# -------------------------------------------------------------------
	649	# All wholsome food is caught without a net or a trap.
	650	# William Blake
	651	# -------------------------------------------------------------------
	652
	653	=pod
	654
	655	=head1 AUTHOR
	656
	657	Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
	658
	659	=head1 SEE ALSO
	660
	661	perl(1), Parse::RecDescent, SQL::Translator::Schema.
	662
	663	=cut