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joko |
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## $Id$ |
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## ------------------------------------------------------------------------ |
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## $Log$ |
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## ------------------------------------------------------------------------ |
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package Regexp::Group; |
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use strict; |
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use warnings; |
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use base 'DesignPattern::Object::Logger'; |
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use Data::Dumper; |
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use Data::Compare::Struct qw( isEmpty ); |
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my @patterns; |
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# ------------ common perl object constructor ------------ |
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sub new { |
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my $invocant = shift; |
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my $class = ref($invocant) || $invocant; |
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my @args = (); |
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@_ && (@args = @_); |
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#$logger->debug( __PACKAGE__ . "->new( @args )" ); # this is not "common"! |
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my $self = { @_ }; |
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bless $self, $class; |
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$self->{caller} = caller; |
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#print Dumper(caller(2)); |
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#exit; |
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$self->_init(); |
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return $self; |
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} |
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sub _init { |
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my $self = shift; |
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# TODO/REVIEW: compile patterns? |
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#@patterns = map{ qr/$_/ } @patterns; |
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# dereference main/raw data (payload) |
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$self->{data} = ${$self->{data}}; |
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} |
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sub scan { |
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my $self = shift; |
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my $stepkeys = shift; |
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my $coderef = shift; |
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#my $nodecount_default = shift; |
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my $nodecount_default = 19; |
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#print "SCAN", "\n"; |
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#print $self->{pattern}, "\n"; |
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$self->{result} = []; |
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$self->{result_raw} = []; |
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# configure tracing |
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# respects additional trace-options passed to _trace-method |
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$self->{TRACE_OPTIONS} = 1; |
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# disables _any_ tracing - even if sub-conditions evaluate to true values |
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$self->{TRACE_DISABLED} = 0; |
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$self->log('starting to scan'); |
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#for (1..20) { |
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my $patterncount = 0; |
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my $match_in_loop; |
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my $steps; |
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if ($stepkeys) { |
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$steps = $stepkeys; |
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$patterncount++; |
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} else { |
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$steps = $self->{metadata}->{steps}; |
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} |
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#print "cb-2: $coderef", "\n"; |
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foreach my $stepkey_current (@{$steps}) { |
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$self->_scan_step($stepkey_current, $coderef); |
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$patterncount++; |
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} |
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#} |
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# ... propagate them to processing |
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# assign result to property of object's current instance |
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#push @{$self->{result}}, $result; |
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#$self->{code}->($self->{caller}, $self); |
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} |
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sub _scan_step { |
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my $self = shift; |
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my $stepkey = shift; |
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my $callback = shift; |
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#print "cb-3: $callback", "\n"; |
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#$self->log("running step '$stepkey'", 'debug'); |
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$self->log("running step '$stepkey'"); |
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my $dataref = $self->{data}; |
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my $metadata = $self->{metadata}->{$stepkey}; |
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my $pattern = $self->{patterns}->{$stepkey}; |
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my $coderef = $self->{coderefs}->{$stepkey}; |
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#print Dumper($coderef); |
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#print Dumper($self->{data}); |
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#exit; |
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$self->trace("data used", $dataref, 0, undef, { tag => '', exit => 0 }); |
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$self->trace("metadata used", $metadata, 0, undef, { tag => '', exit => 0 }); |
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$self->trace("pattern used", $pattern, 0, undef, { tag => '', exit => 0 }); |
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$self->trace("coderef used", $coderef, 0, undef, { tag => '', exit => 0 }); |
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#print "pattern: $pattern", "\n"; |
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#exit; |
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# if metadata variable "noscan" is supplied, don't kick off the regex-engine, just call the coderef |
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# TODO: log this event |
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if ($metadata->{noscan} && $metadata->{noscan} == 1) { |
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$coderef->($self, undef, undef, $callback); |
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return; |
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} |
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# dereference data if its still referenced |
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my $data = ${$self->{data}}; |
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#$self->{data} =~ s{ |
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$data =~ s{ |
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$pattern # the pattern itself - as contained in a string - actually gets interpolated here |
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}{ |
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print "." if $self->{verbose}; |
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$self->log("match in step '$stepkey'"); |
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# have a clean item to fill in slots |
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my $result_item = []; |
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# 1. build matched structure from slots - grouping functionality for slots |
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# V1 - hand-rolled |
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#my $result = [$1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20]; |
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#print Dumper($result); |
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my $count = $metadata->{nodecount}; |
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# TODO: re-renable this! |
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#$count ||= $nodecount_default; |
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# V2 - iterate! |
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# push dummy item to slot '0' to mimic known behaviour of accessing $1, $2, $3, .... |
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push @{$result_item}, 'n/a'; |
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for my $i (1..$count) { |
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my $slot = '$' . $i; |
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push @{$result_item}, eval($slot); |
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} |
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# 2. remember built result (raw) in object - grouping functionality for items |
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$self->log("pushing raw result"); |
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push @{$self->{result_raw}}, $result_item; |
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# 4. check/modify further metadata |
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# e.g. 'column_positions' means: "this step is a ColumnProvider" |
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#print Dumper($metadata); |
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if (my $positions = $metadata->{column_positions}) { |
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$self->trace('positions', $positions, 0); |
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#print Dumper($result_item); |
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# build column-names array from position-metadata |
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my @column_names; |
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map { |
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push @column_names, $result_item->[$_]; |
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} @$positions; |
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# store additional metadata |
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$metadata->{column_names} = \@column_names; |
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} |
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$self->trace('column-names', $metadata->{column_names}, 0); |
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#return ''; |
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#$&; |
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push(@{$self->{matches}->{parsed_chunks}}, $&); |
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#undef; |
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my $matchpos = pos($data); |
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$self->{matches}->{position} = $matchpos; |
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push @{$self->{matches}->{positions}}, $matchpos; |
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# 3. call coderef to get _processed_ result if given (callback) |
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$self->log("calling coderef '$coderef'"); |
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if ($coderef) { |
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my $result_processed = {}; |
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if ($coderef->($self, $result_item, $result_processed, $callback)) { |
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$self->trace("pushing processed result", $result_processed, 0); |
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push @{$self->{result}}, $result_processed if $result_processed; |
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} else { |
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$self->log('processing of container failed', 'warning'); |
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return; |
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} |
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} else { |
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# TODO: croak 'no coderef'; |
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} |
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# pass back matched content if we are not the ones to delete something (pass-back-if-not-remover) |
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# with this mechanism, we can iterate over the same content again and again and don't loose data while doing this |
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# without this, multiple scan stepping would not be possible since each step would either remove its |
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# matched content - or not: no flexibility. |
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# as it seems we need flexibility at any point ;-( in order not to break our necks with code-maintenance ;-) |
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# this also can get configured here (this flag is contained in the metadata-part of your filter-declaration) |
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$& if !$metadata->{remover}; |
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}xge; |
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#$self->{data_rest} = \$data; |
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$self->{data} = \$data; |
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#$self->trace('matches', $self->getMatches(), 1); |
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#$self->trace('matches-positions', $self->getMatchPositions(), 1); |
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} |
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sub continue { |
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my $self = shift; |
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my $scankey = shift; |
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#print "CONTINUE!", "\n"; |
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#$self->{data} = $self->{data_rest}; |
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return $self->scan($scankey); |
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} |
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sub getMatches { |
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my $self = shift; |
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return $self->{result_raw}; |
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} |
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sub getResults { |
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my $self = shift; |
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return $self->{result}; |
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} |
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sub getDataRest { |
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my $self = shift; |
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return $self->{data_rest}; |
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} |
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sub getMatchCount { |
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my $self = shift; |
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my $matches = $self->getMatches(); |
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return if isEmpty($matches); |
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my $count = $#{$matches}; |
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$count++; |
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return $count; |
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} |
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sub getMatchPositions { |
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my $self = shift; |
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if (!$self->getMatchCount()) { |
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$self->{matches}->{positions} = []; |
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} |
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return $self->{matches}->{positions}; |
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} |
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sub getMatchPosition { |
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my $self = shift; |
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return $self->{matches}->{position}; |
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} |
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1; |
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