package SQL::Translator::Parser::SQLServer;

# -------------------------------------------------------------------
# $Id: SQLServer.pm,v 1.4 2006/05/04 20:47:07 duality72 Exp $
# -------------------------------------------------------------------
# Copyright (C) 2002-4 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::SQLServer - parser for SQL Server

=head1 SYNOPSIS

  use SQL::Translator::Parser::SQLServer;

=head1 DESCRIPTION

Adapted from Parser::Sybase and mostly parses the output of
Producer::SQLServer.  The parsing is by no means complete and
should probably be considered a work in progress.

=cut

use strict;

use vars qw[ $DEBUG $VERSION $GRAMMAR @EXPORT_OK ];
$VERSION = sprintf "%d.%02d", q$Revision: 1.4 $ =~ /(\d+)\.(\d+)/;
$DEBUG   = 0 unless defined $DEBUG;

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

@EXPORT_OK = qw(parse);

$::RD_ERRORS = 1;
$::RD_WARN   = 1;
$::RD_HINT   = 1;

$GRAMMAR = q{

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

startrule : statement(s) eofile { \%tables }

eofile : /^\Z/

statement : create_table
    | create_procedure
    | create_index
    | create_constraint
    | comment
    | use
    | setuser
    | if
    | print
    | grant
    | exec
    | <error>

use : /use/i WORD GO 
    { @table_comments = () }

setuser : /setuser/i NAME GO

if : /if/i object_not_null begin if_command end GO

if_command : grant
    | create_index
    | create_constraint

object_not_null : /object_id/i '(' ident ')' /is not null/i

print : /\s*/ /print/i /.*/

else : /else/i /.*/

begin : /begin/i

end : /end/i

grant : /grant/i /[^\n]*/

exec : exec_statement(s) GO

exec_statement : /exec/i /[^\n]+/

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

comment : comment_start comment_middle comment_end
    { 
        my $comment = $item[2];
        $comment =~ s/^\s*|\s*$//mg;
        $comment =~ s/^\**\s*//mg;
        push @table_comments, $comment;
    }

comment_start : m#^\s*\/\*#

comment_end : m#\s*\*\/#

comment_middle : m{([^*]+|\*(?!/))*}

#
# Create table.
#
create_table : /create/i /table/i ident '(' create_def(s /,/) ')' lock(?) on_system(?) ';' GO(?)
    { 
        my $table_owner = $item[3]{'owner'};
        my $table_name  = $item[3]{'name'};

        if ( @table_comments ) {
            $tables{ $table_name }{'comments'} = [ @table_comments ];
            @table_comments = ();
        }

        $tables{ $table_name }{'order'}  = ++$table_order;
        $tables{ $table_name }{'name'}   = $table_name;
        $tables{ $table_name }{'owner'}  = $table_owner;
        $tables{ $table_name }{'system'} = $item[7];

        my $i = 0;
        for my $def ( @{ $item[5] } ) {
            if ( $def->{'supertype'} eq 'field' ) {
                my $field_name = $def->{'name'};
                $tables{ $table_name }{'fields'}{ $field_name } = 
                    { %$def, order => $i };
                $i++;
        
                if ( $def->{'is_primary_key'} ) {
                    push @{ $tables{ $table_name }{'constraints'} }, {
                        type   => 'primary_key',
                        fields => [ $field_name ],
                    };
                }
            }
            elsif ( $def->{'supertype'} eq 'constraint' ) {
                push @{ $tables{ $table_name }{'constraints'} }, $def;
            }
            else {
                push @{ $tables{ $table_name }{'indices'} }, $def;
            }
        }
    }

create_constraint : /create/i constraint 
    {
        @table_comments = ();
        push @{ $tables{ $item[2]{'table'} }{'constraints'} }, $item[2];
    }

create_index : /create/i index
    {
        @table_comments = ();
        push @{ $tables{ $item[2]{'table'} }{'indices'} }, $item[2];
    }

create_procedure : /create/i /procedure/i procedure_body GO
    {
        @table_comments = ();
    }

procedure_body : not_go(s)

not_go : /((?!go).)*/

create_def : constraint
    | index
    | field

blank : /\s*/

field : field_name data_type field_qualifier(s?)
    { 
        my %qualifiers  = map { %$_ } @{ $item{'field_qualifier(s?)'} || [] };
        my $nullable = defined $qualifiers{'nullable'} 
                   ? $qualifiers{'nullable'} : 1;
        $return = { 
            supertype      => 'field',
            name           => $item{'field_name'}, 
            data_type      => $item{'data_type'}{'type'},
            size           => $item{'data_type'}{'size'},
            nullable       => $nullable, 
            default        => $qualifiers{'default_val'}, 
            is_auto_inc    => $qualifiers{'is_auto_inc'}, 
#            is_primary_key => $item{'primary_key'}[0], 
        } 
    }

field_qualifier : nullable
    { 
        $return = { 
             nullable => $item{'nullable'},
        } 
    }

field_qualifier : default_val
    { 
        $return = { 
             default_val => $item{'default_val'},
        } 
    }

field_qualifier : auto_inc
    { 
        $return = { 
             is_auto_inc => $item{'auto_inc'},
        } 
    }

constraint : primary_key_constraint
    | foreign_key_constraint
    | unique_constraint

field_name : WORD

index_name : WORD

table_name : WORD

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

lock : /lock/i /datarows/i

field_type : WORD

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

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


nullable : /not/i /null/i
    { $return = 0 }
    | /null/i
    { $return = 1 }

default_val : /default/i /null/i
    { $return = 'null' }
	| /default/i /'[^']*'/ 
    { $item[2]=~ s/'//g; $return = $item[2] }

auto_inc : /identity/i { 1 }

primary_key_constraint : /constraint/i index_name(?) /primary/i /key/i parens_field_list
    { 
        $return = { 
            supertype => 'constraint',
            name      => $item[2][0],
            type      => 'primary_key',
            fields    => $item[5],
        } 
    }

foreign_key_constraint : /constraint/i index_name(?) /foreign/i /key/i parens_field_list /references/i table_name parens_field_list(?) on_delete(?) on_update(?)
    {
        $return = { 
            supertype        => 'constraint',
            name             => $item[2][0],
            type             => 'foreign_key',
            fields           => $item[5],
            reference_table  => $item[7],
            reference_fields => $item[8][0], 
            on_delete        => $item[9][0],
            on_update        => $item[10][0],
        } 
    }

unique_constraint : /unique/i clustered(?) INDEX(?) index_name(?) on_table(?) parens_field_list
    { 
        $return = { 
            supertype => 'constraint',
            type      => 'unique',
            clustered => $item[2][0],
            name      => $item[4][0],
            table     => $item[5][0],
            fields    => $item[6],
        } 
    }

on_delete : /on delete/i reference_option
    { $item[2] }

on_update : /on update/i reference_option
    { $item[2] }

reference_option: /cascade/i   | 
    /no action/i
    { $item[1] }  

clustered : /clustered/i
    { $return = 1 }
    | /nonclustered/i
    { $return = 0 }

INDEX : /index/i

on_table : /on/i table_name
    { $return = $item[2] }

on_system : /on/i /system/i
    { $return = 1 }

index : clustered(?) INDEX index_name(?) on_table(?) parens_field_list ';'
    { 
        $return = { 
            supertype => 'index',
            type      => 'normal',
            clustered => $item[1][0],
            name      => $item[3][0],
            table     => $item[4][0],
            fields    => $item[5],
        } 
    }

parens_field_list : '(' field_name(s /,/) ')'
    { $item[2] }

ident : QUOTE(?) WORD '.' WORD QUOTE(?)
    { $return = { owner => $item[2], name => $item[4] } }
    | WORD
    { $return = { name  => $item[1] } }

GO : /^go/i

NAME : QUOTE(?) /\w+/ QUOTE(?)
    { $item[2] }

WORD : /[\w#]+/

DIGITS : /\d+/

COMMA : ','

QUOTE : /'/

};

# -------------------------------------------------------------------
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 = sort { 
        $result->{ $a }->{'order'} <=> $result->{ $b }->{'order'}
    } keys %{ $result };

    for my $table_name ( @tables ) {
        my $tdata = $result->{ $table_name };
        my $table = $schema->add_table( name => $tdata->{'name'} ) 
                    or die "Can't create table '$table_name': ", $schema->error;

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

        my @fields = sort { 
            $tdata->{'fields'}->{$a}->{'order'} 
            <=>
            $tdata->{'fields'}->{$b}->{'order'}
        } keys %{ $tdata->{'fields'} };

        for my $fname ( @fields ) {
            my $fdata = $tdata->{'fields'}{ $fname };
            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->{'nullable'},
                comments          => $fdata->{'comments'},
            ) or die $table->error;

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

            for my $qual ( qw[ binary unsigned zerofill list ] ) {
                if ( my $val = $fdata->{ $qual } || $fdata->{ uc $qual } ) {
                    next if ref $val eq 'ARRAY' && !@$val;
                    $field->extra( $qual, $val );
                }
            }

            if ( $field->data_type =~ /(set|enum)/i && !$field->size ) {
                my %extra = $field->extra;
                my $longest = 0;
                for my $len ( map { length } @{ $extra{'list'} || [] } ) {
                    $longest = $len if $len > $longest;
                }
                $field->size( $longest ) if $longest;
            }

            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;
        }
    }

    return 1;
}

1;

# -------------------------------------------------------------------
# Every hero becomes a bore at last.
# Ralph Waldo Emerson
# -------------------------------------------------------------------

=pod

=head1 AUTHOR

Chris Hilton E<lt>chris@dctank.comE<gt> - Bulk of code from
Sybase parser, I just tweaked it for SQLServer. Thanks.

=head1 SEE ALSO

SQL::Translator, SQL::Translator::Parser::DBI, L<http://www.midsomer.org/>.

=cut
