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

package SQL::Translator::Parser::xSV;

# -------------------------------------------------------------------
# $Id: xSV.pm 1440 2009-01-17 16:31:57Z jawnsy $
# -------------------------------------------------------------------
# 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::xSV - parser for arbitrarily delimited text files

=head1 SYNOPSIS

  use SQL::Translator;
  use SQL::Translator::Parser::xSV;

  my $translator  =  SQL::Translator->new(
      parser      => 'xSV',
      parser_args => { field_separator => "\t" },
  );

=head1 DESCRIPTION

Parses arbitrarily delimited text files.  See the 
Text::RecordParser manpage for arguments on how to parse the file
(e.g., C<field_separator>, C<record_separator>).  Other arguments
include:

=head1 OPTIONS

=over

=item * scan_fields

Indicates that the columns should be scanned to determine data types
and field sizes.  True by default.

=item * trim_fields

A shortcut to sending filters to Text::RecordParser, will create 
callbacks that trim leading and trailing spaces from fields and headers.
True by default.

=back

Field names will automatically be normalized by 
C<SQL::Translator::Utils::normalize_name>.

=cut

# -------------------------------------------------------------------

use strict;
use vars qw(@EXPORT);

use Exporter;
use Text::ParseWords qw(quotewords);
use Text::RecordParser;
use SQL::Translator::Utils qw(debug normalize_name);

use base qw(Exporter);
@EXPORT = qw(parse);

#
# Passed a SQL::Translator instance and a string containing the data
#
sub parse {
    my ( $tr, $data )    = @_;
    my $args             = $tr->parser_args;
    my $parser           = Text::RecordParser->new(
        field_separator  => $args->{'field_separator'}  || ',',
        record_separator => $args->{'record_separator'} || "\n",
        data             => $data,
        header_filter    => \&normalize_name,
    );

    $parser->field_filter( sub { $_ = shift || ''; s/^\s+|\s+$//g; $_ } ) 
        unless defined $args->{'trim_fields'} && $args->{'trim_fields'} == 0;

    my $schema = $tr->schema;
    my $table = $schema->add_table( name => 'table1' );

    #
    # Get the field names from the first row.
    #
    $parser->bind_header;
    my @field_names = $parser->field_list;

    for ( my $i = 0; $i < @field_names; $i++ ) {
        my $field = $table->add_field(
            name              => $field_names[$i],
            data_type         => 'char',
            default_value     => '',
            size              => 255,
            is_nullable       => 1,
            is_auto_increment => undef,
        ) or die $table->error;

        if ( $i == 0 ) {
            $table->primary_key( $field->name );
            $field->is_primary_key(1);
        }
    }

    #
    # If directed, look at every field's values to guess size and type.
    #
    unless ( 
        defined $args->{'scan_fields'} &&
        $args->{'scan_fields'} == 0
    ) {
        my %field_info = map { $_, {} } @field_names;
        while ( my $rec = $parser->fetchrow_hashref ) {
            for my $field ( @field_names ) {
                my $data = defined $rec->{ $field } ? $rec->{ $field } : '';
                my $size = [ length $data ];
                my $type;

                if ( $data =~ /^-?\d+$/ ) {
                    $type = 'integer';
                }
                elsif ( 
                    $data =~ /^-?[,\d]+\.[\d+]?$/ 
                    ||
                    $data =~ /^-?[,\d]+?\.\d+$/  
                    ||
                    $data =~ /^-?\.\d+$/  
                ) {
                    $type = 'float';
                    my ( $w, $d ) = 
                        map { s/,//g; length $_ || 1 } split( /\./, $data );
                    $size = [ $w + $d, $d ];
                }
                else {
                    $type = 'char';
                }

                for my $i ( 0, 1 ) {
                    next unless defined $size->[ $i ];
                    my $fsize = $field_info{ $field }{'size'}[ $i ] || 0;
                    if ( $size->[ $i ] > $fsize ) {
                        $field_info{ $field }{'size'}[ $i ] = $size->[ $i ];
                    }
                }

                $field_info{ $field }{ $type }++;
            }
        }

        for my $field ( keys %field_info ) {
            my $size      = $field_info{ $field }{'size'} || [ 1 ];
            my $data_type = 
                $field_info{ $field }{'char'}    ? 'char'  : 
                $field_info{ $field }{'float'}   ? 'float' :
                $field_info{ $field }{'integer'} ? 'integer' : 'char';

            if ( $data_type eq 'char' && scalar @$size == 2 ) {
                $size = [ $size->[0] + $size->[1] ];
            }

            my $field = $table->get_field( $field );
            $field->size( $size );
            $field->data_type( $data_type );
        }
    }

    return 1;
}

1;

# -------------------------------------------------------------------
=pod

=head1 AUTHORS

Darren Chamberlain E<lt>darren@cpan.orgE<gt>,
Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.

=head1 SEE ALSO

Text::RecordParser, SQL::Translator.

=cut