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Add lib/, t/lib/, and sandbox/. All modules are updated and passing on MySQL 5.1.
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Daniel Nichter
250
lib/TextResultSetParser.pm
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250
lib/TextResultSetParser.pm
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# This program is copyright 2008-2011 Percona Inc.
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# Feedback and improvements are welcome.
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#
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# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
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# systems, you can issue `man perlgpl' or `man perlartistic' to read these
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# licenses.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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# Place, Suite 330, Boston, MA 02111-1307 USA.
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# ###########################################################################
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# TextResultSetParser package $Revision: 6898 $
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# ###########################################################################
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# Package: TextResultSetParser
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# TextResultSetParser converts a text result set to a data struct like
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# DBI::selectall_arrayref(). Text result sets are like what SHOW PROCESSLIST
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# and EXPLAIN print, like:
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#
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# +----+------+
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# | Id | User |
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# +----+------+
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# | 1 | bob |
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# +----+------+
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#
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# That converts to:
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# (start code)
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# [
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# {
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# Id => '1',
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# User => 'bob',
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# },
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# ]
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# (end code)
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# Both horizontal and vertical (\G) text outputs are supported.
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{
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package TextResultSetParser;
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use strict;
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use warnings FATAL => 'all';
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use English qw(-no_match_vars);
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use constant MKDEBUG => $ENV{MKDEBUG} || 0;
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# Sub: new
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#
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# Parameters:
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# %args - Arguments
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#
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# Optional Arguments:
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# value_for - Hashref of original_val => new_val, used to alter values
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# NAME_lc - Lowercase key names, like $dbh->{FetchHashKeyName} = 'NAME_lc'
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#
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# Returns:
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# TextResultSetParser object
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sub new {
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my ( $class, %args ) = @_;
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my %value_for = (
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'NULL' => undef, # DBI::selectall_arrayref() does this
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($args{value_for} ? %{$args{value_for}} : ()),
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);
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my $self = {
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%args,
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value_for => \%value_for,
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};
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return bless $self, $class;
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}
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# Sub: _pasre_tabular
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# Parse a line from tabular horizontal output.
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#
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# Parameters:
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# $text - Text row from horizontal output, split in <parse_horizontal_rows()>
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# @cols - Column names that text rows are organized by
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#
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# Returns:
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# A record hashref
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sub _parse_tabular {
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my ( $text, @cols ) = @_;
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my %row;
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my @vals = $text =~ m/\| +([^\|]*?)(?= +\|)/msg;
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return (undef, \@vals) unless @cols;
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@row{@cols} = @vals;
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return (\%row, undef);
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}
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# Sub: _pasre_tabular
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# Parse a line from tab-separated horizontal output.
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#
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# Parameters:
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# $text - Text row from horizontal output, split in <parse_horizontal_rows()>
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# @cols - Column names that text rows are organized by
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#
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# Returns:
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# A record hashref
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sub _parse_tab_sep {
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my ( $text, @cols ) = @_;
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my %row;
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my @vals = split(/\t/, $text);
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return (undef, \@vals) unless @cols;
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@row{@cols} = @vals;
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return (\%row, undef);
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}
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# Sub: parse_vertical_row
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# Parse records split from vertical output by <split_vertical_rows()>.
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#
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# Parameters:
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# $text - Text record
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#
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# Returns:
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# A record hashref
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sub parse_vertical_row {
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my ( $self, $text ) = @_;
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my %row = $text =~ m/^\s*(\w+):(?: ([^\n]*))?/msg;
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if ( $self->{NAME_lc} ) {
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my %lc_row = map {
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my $key = lc $_;
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$key => $row{$_};
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} keys %row;
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return \%lc_row;
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}
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else {
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return \%row;
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}
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}
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# Sub: parse
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# Parse a text result set.
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#
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# Parameters:
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# $text - Text result set
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#
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# Returns:
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# Arrayref like:
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# (start code)
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# [
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# {
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# Time => '5',
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# Command => 'Query',
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# db => 'foo',
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# },
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# ]
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# (end code)
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sub parse {
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my ( $self, $text ) = @_;
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my $result_set;
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# Detect text type: tabular, tab-separated, or vertical
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if ( $text =~ m/^\+---/m ) { # standard "tabular" output
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MKDEBUG && _d('Result set text is standard tabular');
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my $line_pattern = qr/^(\| .*)[\r\n]+/m;
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$result_set
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= $self->parse_horizontal_row($text, $line_pattern, \&_parse_tabular);
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}
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elsif ( $text =~ m/^\w+\t\w+/m ) { # tab-separated
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MKDEBUG && _d('Result set text is tab-separated');
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my $line_pattern = qr/^(.*?\t.*)[\r\n]+/m;
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$result_set
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= $self->parse_horizontal_row($text, $line_pattern, \&_parse_tab_sep);
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}
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elsif ( $text =~ m/\*\*\* \d+\. row/ ) { # "vertical" output
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MKDEBUG && _d('Result set text is vertical (\G)');
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foreach my $row ( split_vertical_rows($text) ) {
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push @$result_set, $self->parse_vertical_row($row);
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}
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}
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else {
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my $text_sample = substr $text, 0, 300;
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my $remaining = length $text > 300 ? (length $text) - 300 : 0;
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chomp $text_sample;
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die "Cannot determine if text is tabular, tab-separated or vertical:\n"
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. "$text_sample\n"
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. ($remaining ? "(not showing last $remaining bytes of text)\n" : "");
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}
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# Convert values.
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if ( $self->{value_for} ) {
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foreach my $result_set ( @$result_set ) {
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foreach my $key ( keys %$result_set ) {
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next unless defined $result_set->{$key};
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$result_set->{$key} = $self->{value_for}->{ $result_set->{$key} }
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if exists $self->{value_for}->{ $result_set->{$key} };
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}
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}
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}
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return $result_set;
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}
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# Sub: parse_horizontal_row
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# Parse rows from horizontal output (regular MySQL style output).
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#
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# Parameters:
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# $text - Text result set
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# $line_pattern - Compiled regex pattern that matches one line
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# $sub - Coderef to parse a line (tabular or tab-separated lines)
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#
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# Returns:
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# Arrayref of records as hashrefs
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sub parse_horizontal_row {
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my ( $self, $text, $line_pattern, $sub ) = @_;
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my @result_sets = ();
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my @cols = ();
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foreach my $line ( $text =~ m/$line_pattern/g ) {
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my ( $row, $cols ) = $sub->($line, @cols);
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if ( $row ) {
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push @result_sets, $row;
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}
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else {
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@cols = map { $self->{NAME_lc} ? lc $_ : $_ } @$cols;
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}
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}
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return \@result_sets;
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}
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# Sub: parse_horizontal_row
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# Split records in vertical output (\G style output).
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#
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# Parameters:
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# $text - Text result set
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#
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# Returns:
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# Array of text records, parsed by <parse_vertical_row()>.
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sub split_vertical_rows {
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my ( $text ) = @_;
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my $ROW_HEADER = '\*{3,} \d+\. row \*{3,}';
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my @rows = $text =~ m/($ROW_HEADER.*?)(?=$ROW_HEADER|\z)/omgs;
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return @rows;
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}
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sub _d {
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my ($package, undef, $line) = caller 0;
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@_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
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map { defined $_ ? $_ : 'undef' }
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@_;
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print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
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}
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1;
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}
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# ###########################################################################
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# End TextResultSetParser package
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# ###########################################################################
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