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# Symbol predicates. |
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# Copyright 2007, 2008, 2009, 2010, 2013, 2015, 2016 Kevin Ryde |
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# This file is part of Chart. |
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# |
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# Chart is free software; you can redistribute it and/or modify it under the |
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# terms of the GNU General Public License as published by the Free Software |
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# Foundation; either version 3, or (at your option) any later version. |
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# |
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# Chart is distributed in the hope that it will be useful, but WITHOUT ANY |
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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# details. |
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# |
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# You should have received a copy of the GNU General Public License along |
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# with Chart. If not, see <http://www.gnu.org/licenses/>. |
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package App::Chart::Sympred; |
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use 5.005; |
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use strict; |
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use warnings; |
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use Carp; |
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use Scalar::Util; |
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use List::Util; |
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use App::Chart; |
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sub validate { |
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my ($obj) = @_; |
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if (! (Scalar::Util::blessed ($obj) && $obj->isa (__PACKAGE__))) { |
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croak 'Not a symbol predicate: ' . ($obj||'undef'); |
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} |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Equal; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, $suffix) = @_; |
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return bless { suffix => $suffix }, $class; |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return ($symbol eq $self->{'suffix'}); |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Suffix; |
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use 5.006; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, $suffix) = @_; |
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if ($suffix =~ /\..*\./) { |
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# two or more dots |
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return App::Chart::Sympred::Regexp->new (qr/\Q$suffix\E$/); |
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} else { |
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return bless { suffix => $suffix }, $class; |
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} |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return (App::Chart::symbol_suffix ($symbol) eq $self->{'suffix'}); |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Prefix; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, $prefix) = @_; |
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return bless { prefix => $prefix }, $class; |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return ($symbol =~ /^\Q$self->{'prefix'}\E/); |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Regexp; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, $pattern) = @_; |
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return bless { pattern => $pattern }, $class; |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return ($symbol =~ m/$self->{'pattern'}/); |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Proc; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, $proc) = @_; |
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return bless { proc => $proc }, $class; |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return &{$self->{'proc'}} ($symbol); |
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} |
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#------------------------------------------------------------------------------ |
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package App::Chart::Sympred::Any; |
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use strict; |
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use warnings; |
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use base 'App::Chart::Sympred'; |
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sub new { |
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my ($class, @preds) = @_; |
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foreach my $pred (@preds) { App::Chart::Sympred::validate ($pred); } |
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return bless { preds => \@preds }, $class; |
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} |
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sub add { |
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my ($self, @newpreds) = @_; |
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foreach my $pred (@newpreds) { App::Chart::Sympred::validate ($pred); } |
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push @{$self->{'preds'}}, @newpreds; |
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} |
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sub match { |
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my ($self, $symbol) = @_; |
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return List::Util::first { $_->match($symbol) } @{$self->{'preds'}}; |
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} |
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1; |
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__END__ |
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=for stopwords ie Eg |
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=head1 NAME |
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App::Chart::Sympred -- symbol predicate objects |
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=head1 SYNOPSIS |
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use App::Chart::Sympred; |
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my $sympred = App::Chart::Sympred::Suffix->new ('.AX'); |
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$sympred->match('FOO.AX') # returns true |
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165
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=head1 DESCRIPTION |
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A C<App::Chart::Sympred> object represents a predicate for use on stock and |
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commodity symbols, ie. a test of whether a symbol has a certain suffix or |
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similar. |
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=head1 FUNCTIONS |
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=head2 Constructors |
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=over |
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=item C<< $sympred = App::Chart::Sympred::Equal->new ($suffix) >> |
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Return a new C<App::Chart::Sympred> object which matches only the given |
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symbol exactly. Eg. |
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my $sympred = App::Chart::Sympred::Equal->new ('FOO.BAR') |
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=item C<< $sympred = App::Chart::Sympred::Suffix->new ($suffix) >> |
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186
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Return a new C<App::Chart::Sympred> object which matches the given symbol |
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suffix. Eg. |
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189
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my $sympred = App::Chart::Sympred::Suffix->new ('.FOO') |
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191
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=item C<< $sympred = App::Chart::Sympred::Prefix->new ($prefix) >> |
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193
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Return a new C<App::Chart::Sympred> object which matches the given symbol |
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prefix. Eg. |
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196
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my $sympred = App::Chart::Sympred::Prefix->new ('^NZ') |
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198
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=item C<< $sympred = App::Chart::Sympred::Regexp->new (qr/.../) >> |
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200
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Return a new C<App::Chart::Sympred> object which matches the given regexp |
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pattern. Eg. |
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203
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my $sympred = App::Chart::Sympred::Regexp->new (qr/^\^BV|\.SA$/); |
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205
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=item C<< $sympred = App::Chart::Sympred::Proc->new (\&proc) >> |
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207
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Return a new C<App::Chart::Sympred> object which calls the given C<proc> |
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subroutine to test for a match. Eg. |
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210
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sub my_fancy_test { |
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my ($symbol) = @_; |
212
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return (some zany test on $symbol); |
213
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} |
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my $sympred = App::Chart::Sympred::Proc->new (\&my_fancy_test); |
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216
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=item C<< $sympred = App::Chart::Sympred::Any->new ($pred,...) >> |
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218
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Return a new C<App::Chart::Sympred> object which is true if any of the given |
219
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C<$pred> predicates is true. Eg. |
220
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221
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my $nz = App::Chart::Sympred::Suffix->new ('.NZ') |
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my $bc = App::Chart::Sympred::Suffix->new ('.BC') |
223
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224
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my $sympred = App::Chart::Sympred::Any->new ($nz, $bc); |
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226
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=back |
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228
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=head2 Methods |
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230
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=over |
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232
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=item C<< $sympred->match ($symbol) >> |
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234
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Return true if C<$symbol> is matched by the C<$sympred> object. |
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=item C<< $sympred->add ($pred,...) >> |
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238
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Add additional predicates to a C<App::Chart::Sympred::Any> object. |
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240
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=item C<< App::Chart::Sympred::validate ($obj) >> |
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242
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Check that C<$obj> is a C<App::Chart::Sympred> object, throw an error if not. |
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244
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=back |
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246
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=head1 HOME PAGE |
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248
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L<http://user42.tuxfamily.org/chart/index.html> |
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250
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=head1 LICENCE |
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252
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Copyright 2007, 2008, 2009, 2010, 2013, 2015, 2016 Kevin Ryde |
253
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254
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Chart is free software; you can redistribute it and/or modify it under the |
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terms of the GNU General Public License as published by the Free Software |
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Foundation; either version 3, or (at your option) any later version. |
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258
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Chart is distributed in the hope that it will be useful, but WITHOUT ANY |
259
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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details. |
262
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263
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You should have received a copy of the GNU General Public License along with |
264
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Chart; see the file F<COPYING>. Failing that, see |
265
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L<http://www.gnu.org/licenses/>. |
266
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267
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=cut |