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package Perl::ToPerl6::Theme; |
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use 5.006001; |
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use strict; |
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use warnings; |
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use English qw(-no_match_vars); |
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use Readonly; |
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use Exporter 'import'; |
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use List::MoreUtils qw(any); |
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use Perl::ToPerl6::Utils qw{ :characters :data_conversion }; |
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use Perl::ToPerl6::Exception::Fatal::Internal qw{ &throw_internal }; |
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use Perl::ToPerl6::Exception::Configuration::Option::Global::ParameterValue |
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qw{ &throw_global_value }; |
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#----------------------------------------------------------------------------- |
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our $VERSION = '0.03'; |
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#----------------------------------------------------------------------------- |
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Readonly::Array our @EXPORT_OK => qw{ |
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$RULE_INVALID_CHARACTER_REGEX |
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cook_rule |
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}; |
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#----------------------------------------------------------------------------- |
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Readonly::Scalar our $RULE_INVALID_CHARACTER_REGEX => |
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qr/ ( [^()\s\w\d+\-*&|!] ) /xms; |
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#----------------------------------------------------------------------------- |
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Readonly::Scalar my $CONFIG_KEY => 'theme'; |
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#----------------------------------------------------------------------------- |
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sub new { |
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1
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26623
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my ( $class, %args ) = @_; |
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290
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my $self = bless {}, $class; |
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114
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434
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$self->_init( %args ); |
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498
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return $self; |
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} |
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#----------------------------------------------------------------------------- |
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sub _init { |
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114
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114
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my ($self, %args) = @_; |
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114
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66
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485
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my $rule = $args{-rule} || $EMPTY; |
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55
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114
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100
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603
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if ( $rule =~ m/$RULE_INVALID_CHARACTER_REGEX/xms ) { |
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throw_global_value |
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option_name => $CONFIG_KEY, |
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option_value => $rule, |
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message_suffix => qq{contains an invalid character: "$1".}; |
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} |
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62
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106
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253
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$self->{_rule} = cook_rule( $rule ); |
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64
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106
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210
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return $self; |
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} |
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#----------------------------------------------------------------------------- |
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sub rule { |
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5
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5
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1
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14
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my $self = shift; |
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5
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114
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return $self->{_rule}; |
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} |
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#----------------------------------------------------------------------------- |
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sub transformer_is_thematic { |
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78
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1634
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1634
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1
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4719
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my ($self, %args) = @_; |
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my $transformer = $args{-transformer} |
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1634
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33
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6981
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|| throw_internal 'The -transformer argument is required'; |
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1634
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50
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35912
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ref $transformer |
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|| throw_internal 'The -transformer must be an object'; |
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84
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1634
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100
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6155
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my $rule = $self->{_rule} or return 1; |
85
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799
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2726
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my %themes = hashify( $transformer->get_themes() ); |
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87
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# This bit of magic turns the rule into a perl expression that can be |
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# eval-ed for truth. Each theme name in the rule is translated to 1 or 0 |
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# if the $transformer belongs in that theme. For example: |
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# |
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# 'bugs && (pbp || core)' ...could become... '1 && (0 || 1)' |
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93
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799
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1108
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my $as_code = $rule; #Making a copy, so $rule is preserved |
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799
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100
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3287
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$as_code =~ s/ ( [\w\d]+ ) /exists $themes{$1} || 0/gexms; |
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1483
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6765
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95
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799
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37841
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my $is_thematic = eval $as_code; |
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97
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799
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100
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2512
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if ($EVAL_ERROR) { |
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1
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6
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throw_global_value |
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option_name => $CONFIG_KEY, |
100
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option_value => $rule, |
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message_suffix => q{contains a syntax error.}; |
102
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} |
103
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104
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798
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3317
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return $is_thematic; |
105
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} |
106
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107
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#----------------------------------------------------------------------------- |
108
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109
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sub cook_rule { |
110
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195
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195
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1
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6709
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my ($raw_rule) = @_; |
111
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195
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50
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433
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return if not defined $raw_rule; |
112
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113
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#Translate logical operators |
114
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195
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432
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$raw_rule =~ s{\b not \b}{!}ixmsg; # "not" -> "!" |
115
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195
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270
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$raw_rule =~ s{\b and \b}{&&}ixmsg; # "and" -> "&&" |
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258
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$raw_rule =~ s{\b or \b}{||}ixmsg; # "or" -> "||" |
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118
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#Translate algebra operators (for backward compatibility) |
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195
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207
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$raw_rule =~ s{\A [-] }{!}ixmsg; # "-" -> "!" e.g. difference |
120
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195
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211
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$raw_rule =~ s{ [-] }{&& !}ixmsg; # "-" -> "&& !" e.g. difference |
121
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195
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257
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$raw_rule =~ s{ [*] }{&&}ixmsg; # "*" -> "&&" e.g. intersection |
122
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195
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239
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$raw_rule =~ s{ [+] }{||}ixmsg; # "+" -> "||" e.g. union |
123
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124
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195
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288
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my $cooked_rule = lc $raw_rule; #Is now cooked! |
125
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195
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548
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return $cooked_rule; |
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} |
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128
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129
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1; |
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131
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__END__ |
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133
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#----------------------------------------------------------------------------- |
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135
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=pod |
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137
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=head1 NAME |
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139
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Perl::ToPerl6::Theme - Construct thematic sets of transformers. |
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141
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=head1 DESCRIPTION |
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This is a helper class for evaluating theme expressions into sets of |
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Transformer objects. There are no user-serviceable parts here. |
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147
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148
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=head1 INTERFACE SUPPORT |
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This is considered to be a non-public class. Its interface is subject |
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to change without notice. |
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153
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154
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=head1 METHODS |
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156
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=over |
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158
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=item C<< new( -rule => $rule_expression ) >> |
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160
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Returns a reference to a new Perl::ToPerl6::Theme object. C<-rule> is |
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a string expression that evaluates to true or false for each Transformer.. |
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See L<"THEME RULES"> for more information. |
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164
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165
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=item C<< transformer_is_thematic( -transformer => $transformer ) >> |
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167
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Given a reference to a L<Perl::ToPerl6::Transformer|Perl::ToPerl6::Transformer> |
168
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object, this method returns evaluates the rule against the themes that |
169
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are associated with the Transformer. Returns 1 if the Transformer satisfies the |
170
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rule, 0 otherwise. |
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172
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173
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=item C< rule() > |
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175
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Returns the rule expression that was used to construct this Theme. |
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The rule may have been translated into a normalized expression. See |
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L<"THEME RULES"> for more information. |
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179
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=back |
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181
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182
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=head2 THEME RULES |
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184
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A theme rule is a simple boolean expression, where the operands are |
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the names of any of the themes associated with the |
186
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Perl::ToPerl6::Polices. |
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188
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Theme names can be combined with logical operators to form arbitrarily |
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complex expressions. Precedence is the same as normal mathematics, |
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but you can use parentheses to enforce precedence as well. Supported |
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operators are: |
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193
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Operator Altertative Example |
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---------------------------------------------------------------- |
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&& and 'pbp && core' |
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|| or 'pbp || (bugs && security)' |
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! not 'pbp && ! (portability || complexity) |
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199
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See L<Perl::ToPerl6/"CONFIGURATION"> for more information about |
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customizing the themes for each Transformer. |
201
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202
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203
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=head1 SUBROUTINES |
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205
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=over |
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207
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=item C<cook_rule( $rule )> |
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209
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Standardize a rule into a almost executable Perl code. The "almost" |
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comes from the fact that theme names are left as is. |
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212
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213
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=back |
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215
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216
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=head1 CONSTANTS |
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218
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=over |
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220
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=item C<$RULE_INVALID_CHARACTER_REGEX> |
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222
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A regular expression that will return the first character in the |
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matched expression that is not valid in a rule. |
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225
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226
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=back |
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228
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229
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=head1 AUTHOR |
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231
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Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> |
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233
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234
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=head1 COPYRIGHT |
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236
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Copyright (c) 2006-2011 Imaginative Software Systems |
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238
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This program is free software; you can redistribute it and/or modify |
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it under the same terms as Perl itself. The full text of this license |
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can be found in the LICENSE file included with this module. |
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242
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=cut |
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244
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############################################################################## |
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# Local Variables: |
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# mode: cperl |
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# cperl-indent-level: 4 |
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# fill-column: 78 |
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# indent-tabs-mode: nil |
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# c-indentation-style: bsd |
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# End: |
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# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround : |