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package Regexp::Match::List; |
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# $Id: List.pm,v 1.1.1.1.8.3 2004/04/29 01:45:31 dgrant Exp $ |
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# IDEA: allow match() to skip regexps below a certain hitrate. |
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# IDEA: use qr// to precompile regexps |
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use strict; |
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use warnings; |
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use base qw( Class::Base ); |
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use Data::Sorting qw( :basics :arrays ); |
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use Data::Dumper; |
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use vars qw($VERSION %CONF); |
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$VERSION = 0.50; |
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%CONF = |
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# CONFIGURATION -- This configuation is loaded into $self via load_args() |
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( |
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# INTERNAL DEFAULTS (can be touched externally) |
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USESTUDY => 1, # use "study STRING;" for regexp strings |
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OPCHECK => 50, # Num of match() calls before calling optimize() |
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OPSKIP => 0, # Skip optimize() ? |
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OPWEIGHT => 1, # Default regexp hit weight |
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OPHITS => 0, # Default regexp hits |
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OPSORTCONF => # Data::Sorting Sort Rules. Used in optimize() |
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[ # The hashlike syntax is to get around some issue |
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# in Data::Sorting that wouldn't let me use a hashref |
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-compare => 'numeric', |
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-order => 'reverse', |
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-sortkey => sub { $_[0]->{'hits'} * $_[0]->{'weight'} } |
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], |
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# INTERNAL STRUCTURE (cannot be touched externally) |
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'_RE' => [], # Store regexps in arrayref. See add() |
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'_COUNT' => # Number of times a function has been called |
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{ |
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match => 0, |
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optimize => 0 |
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}, |
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); |
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sub match($$) |
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# PUBLIC METHOD |
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# Test a string for all available regular expressions. |
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# |
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my $self = shift; |
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my ($string) = @_; |
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my ($RE, $test, @results); |
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# A possible regexp optimization. see % perldoc -f study |
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study $string if ($self->{'USESTUDY'}); |
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REGEXP: |
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for my $i (0..$#{ $self->{'_RE'} }) |
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# Iterate through all regular expressions. |
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# This uses a for() b/c it allows for more control |
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# than Set::Array::foreach() (we can escape on a match) |
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{ |
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$self->_increment(); # $self->{'_COUNT'}{'match'}++ |
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$self->optimize(); # which is used by optimize() |
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$RE = $self->{'_RE'}->[$i]; # The current regular expression |
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# Execute the regular expression in list context and |
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# store the results ($1 .. $n) in an array |
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@results = ($string =~ $RE->{'test'}); |
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$self->debug("STRING:$string\n"); |
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$self->debug("TEST:$RE->{'test'}\n"); |
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$self->debug("RESULTS:", (scalar(@results)), '-', join(',', @results), "\n\n"); |
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if ($RE->callback(@results)) |
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# A successful match may not be enough for a positive |
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# result depending on the outcome of the callback which |
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# is entirely out of Regexp::Match::List's control. |
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# When it is, we acknowledge and reward a successful |
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# regular expression, then bust out of this hellish loop. |
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{ |
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$RE->count_hit(); # $RE->{'hits'}++ |
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last REGEXP; # Bust out |
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} |
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} |
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#print Dumper($RE, @results); |
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return ($results[0]) |
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? ($RE, @results) |
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: (); |
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} |
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sub add(\%) |
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# PUBLIC METHOD |
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# Add a regular expression to the mix. |
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# IN: (scalar) regular expression w/o '/' (i.e. '^.+?\s$') |
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# [(scalar) multiplier for hits, used by optimize() ] |
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# OUT: Whatever Set::Array::push() returns |
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{ |
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my $self = shift; |
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my %re = @_; |
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$self->check_re_conf(\%re); |
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$re{'weight'} ||= $self->{'OPWEIGHT'}; |
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$re{'hits'} ||= $self->{'OPHITS'}; |
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push (@{ $self->{'_RE'} }, Regexp::Match::List::RE->create(%re)); |
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115
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} |
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sub check_re_conf(\%) |
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# Determine whether the given hashref contains all the information |
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# required to create a regexp entry in $self->{'RE'} |
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# TODO: complete check_re_conf() |
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{ |
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my $self = shift; |
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return 1; |
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} |
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sub optimize() |
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# PUBLIC METHOD, USED INTERNALLY |
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# Sort Set::Array object of regular expressions by # of times |
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# match() is called. This will run only when match() has been called |
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# a multiple of $self->{'OPCHECK'} times |
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{ |
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my $self = shift; |
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my $cnt_match = $self->_count('match'); |
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135
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# We only optimize when... |
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return if ( |
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# we are told allowed to, and when... |
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($self->{'OPSKIP'} == 1) || |
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# the iteration counter reaches a multiple of $self->{'OPCHECK'} |
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(($cnt_match % $self->{'OPCHECK'}) > 1) |
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); |
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143
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# Count up a hit for this function only when we actually resort |
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# This information is only useful for reference |
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$self->_increment(); # $self->{'_COUNT'}{'optimize'}++ |
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147
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$self->debug("optimize(): running at match() call #$cnt_match\n\n"); |
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149
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# Sort using Data::Sorting. $self->{'OPSORTCONF'} contains a |
150
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# sort rule configuration. |
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sort_arrayref($self->{'_RE'}, @{ $self->{'OPSORTCONF'} }); |
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152
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153
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} |
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# EXTREMELY PRIVATE METHODS |
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# Haha. Philstrdamous, I know you love this one. |
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# Increments a counter by one. The particular counter is determined |
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# by the calling function. i.e. $self->{'_COUNT'}{'optimize'}++ |
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sub _increment() { $_[0]->{'_COUNT'}{ (split '::', (caller(1))[3])[3] }++ } |
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# Returns the value of the counter for the given function |
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sub _count() { $_[0]->{'_COUNT'}{$_[1]} } |
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168
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173
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# CONSTRUCTOR RELATED |
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sub init() |
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# Rekindle all that we are |
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{ |
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my ($self, $config) = @_; # Get vars from Class::Base::new() |
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$self->load_args($config); # Load config into $self |
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$self->create_attributes(); # Set our attributes and defaults |
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return $self; |
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} |
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183
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sub create_attributes() |
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# Add internal attributes to $self (does not overwrite existing values) |
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# AND apply default values to externally setable parameters |
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{ |
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my $self = shift; |
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189
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# See %CONF declaration at the top of this file |
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191
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foreach my $a (keys %CONF) |
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{ |
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$self->{$a} = $CONF{$a} unless (exists($self->{$a})); |
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} |
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return $self; |
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} |
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199
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sub load_args($$) |
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# Used by the constructor to load config into $self. |
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# NOTE: _ is skipped |
202
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{ |
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0
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my ($self, $args) = (shift, shift); |
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205
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for my $key (keys %{ $args }) |
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206
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{ |
207
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# Skip values that could overwrite internal attributes |
208
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0
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0
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next if $key =~ /^\_/; |
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210
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0
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(!exists($self->{$key})) |
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? $self->{$key} = $args->{$key} |
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: ($self->debug("loadArgs: $key already exists in \$self")); |
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} |
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215
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0
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return $self; |
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} |
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############################################################################### |
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# TODO: move into separate module (Regexp::Match::List::RE?) |
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package Regexp::Match::List::RE; |
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# A simple object to store a regular expression test and all its matter |
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sub create() |
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# A constructor. |
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# See add() |
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{ |
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my $class = shift; |
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my %att = @_; |
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my $self = {}; |
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bless \%att, $class; |
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} |
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# Increment hit tally for this regular expression by user value or 1 |
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# See match() |
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sub count_hit() { shift->{'hits'} += shift || 1; } |
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sub callback() |
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# Run this regular expression's callback if one exists. |
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# By default we will return the result of the regexp test. |
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# IN: (array) results ($1 .. $n) of this RE on the current string |
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# OUT: (bool) success as determined by the callback |
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# |
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# See match() |
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{ |
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my $self = shift; |
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# If there is no callback, return the test result |
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return ($#_ >= 0) unless(exists($self->{'callback'})); |
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# Send the callback the test result as well as a reference to ourself |
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return &{ $self->{'callback'} }($self, @_); |
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} |
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# $Log: List.pm,v $ |
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# Revision 1.1.1.1.8.3 2004/04/29 01:45:31 dgrant |
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# - Initial preparation for CPAN |
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# |
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# Revision 1.1.1.1.8.2 2004/04/23 23:30:25 dgrant |
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# - Added callback template to Regexp/Match/List.pm |
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# |
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# Revision 1.1.1.1.8.1 2004/04/16 17:10:34 dgrant |
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# - Merging libperl-016 changes into the libperl-1-current trunk |
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# |
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# Revision 1.1.1.1.2.1.20.2 2004/04/08 18:23:56 dgrant |
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# *** empty log message *** |
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# |
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# Revision 1.1.1.1.2.1.20.1 2004/04/08 16:42:30 dgrant |
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# - No significant change |
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# |
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# Revision 1.1.1.1.2.1 2004/03/25 01:49:51 dgrant |
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# - Inital import of List.pm |
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# - Added cvs Id and Log variables |
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# |
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1; |
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__END__ |