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package Devel::TypeCheck::Type::Omicron; |
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=head1 NAME |
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Devel::TypeCheck::Type::Omicron - Type representing arrays. |
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=head1 SYNOPSIS |
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use Devel::TypeCheck::Type::Omicron; |
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=head1 DESCRIPTION |
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This class represents the Omicron (capital 'O') terminal in the type |
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language. As such, it maintains type information for arrays. This |
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class is a little bit different than the others, because it can |
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represent two essentially different types: lists of homogeneous typed |
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values, or tuples of heterogeneous types. This has an adaptation to |
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the unify() algorithm where a tuple can be unified with a list through |
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promotion to a list if all elements of the tuple can be unified with |
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the list element type. Lists cannot be demoted to tuples. |
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Inherits from Devel::TypeCheck::Type and Devel::TypeCheck::TSub. |
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=cut |
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use strict; |
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use Carp; |
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use Devel::TypeCheck::Type; |
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use Devel::TypeCheck::Util; |
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our @ISA = qw(Devel::TypeCheck::Type Devel::TypeCheck::Type::TSub); |
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# **** CLASS **** |
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our @SUBTYPES; |
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our @subtypes; |
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BEGIN { |
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@SUBTYPES = (Devel::TypeCheck::Type::K()); |
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for my $i (@SUBTYPES) { |
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2235
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$subtypes[$i] = 1; |
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} |
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} |
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sub hasSubtype { |
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my ($this, $index) = @_; |
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return ($subtypes[$index]); |
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} |
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52
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# **** INSTANCE **** |
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54
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sub new { |
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my ($name, $type) = @_; |
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my $this = {}; |
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$this->{'ref'} = newRef($type); |
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0
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return bless($this, $name); |
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} |
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64
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sub newRef { |
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my ($type) = @_; |
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my $ref = {}; |
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0
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0
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if (defined($type)) { |
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$ref->{'ary'} = undef; |
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$ref->{'homogeneous'} = TRUE; |
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$ref->{'subtype'} = $type; |
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} else { |
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$ref->{'ary'} = []; |
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$ref->{'homogeneous'} = FALSE; |
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$ref->{'subtype'} = undef; |
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} |
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return $ref; |
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} |
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sub derefIndex { |
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my ($this, $index, $env) = @_; |
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if (!defined($env)) { |
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confess("null environment"); |
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} |
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89
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0
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0
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if ($this->homogeneous) { |
90
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return $this->derefHomogeneous; |
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} else { |
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0
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confess("index is negative") if ($index < 0); |
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94
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0
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0
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if (!exists($this->ary->[$index])) { |
95
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$this->ary->[$index] = $env->freshKappa(); |
96
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} |
97
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98
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return $this->ary->[$index]; |
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} |
100
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} |
101
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102
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sub ary { |
103
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1
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my ($this) = @_; |
104
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return $this->{'ref'}->{'ary'}; |
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} |
106
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107
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sub subtype { |
108
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1
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return undef; |
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} |
110
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111
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sub derefHomogeneous { |
112
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0
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0
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1
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my ($this) = @_; |
113
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0
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0
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if ($this->homogeneous) { |
114
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0
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return $this->{'ref'}->{'subtype'}; |
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} else { |
116
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0
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confess("type is not homogeneous"); |
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} |
118
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} |
119
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120
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sub homogeneous { |
121
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0
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0
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1
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my ($this) = @_; |
122
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0
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return $this->{'ref'}->{'homogeneous'}; |
123
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} |
124
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125
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sub str { |
126
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0
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1
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my ($this, $env) = @_; |
127
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128
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0
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0
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if ($this->homogeneous) { |
129
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0
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return "(" . $this->derefHomogeneous->str($env) . ", ...)"; |
130
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} else { |
131
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0
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my $str = "("; |
132
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133
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0
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my @str = (); |
134
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0
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for (my $i = 0; $i <= $#{$this->ary}; $i++) { |
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135
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0
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push(@str, $this->derefIndex($i, $env)->str($env)); |
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} |
137
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138
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0
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$str .= join(",", @str); |
139
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140
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0
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return $str . ")"; |
141
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} |
142
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} |
143
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144
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sub pretty { |
145
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0
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0
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1
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my ($this, $env) = @_; |
146
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147
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0
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0
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if ($this->homogeneous) { |
148
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0
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return "LIST of (" . $this->derefHomogeneous->pretty($env) . ", ...)"; |
149
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} else { |
150
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0
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my $str = "TUPLE of ("; |
151
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152
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0
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my @str = (); |
153
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0
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for (my $i = 0; $i <= $#{$this->ary}; $i++) { |
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0
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154
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0
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push(@str, $this->derefIndex($i, $env)->pretty($env)); |
155
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} |
156
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157
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0
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$str .= join(",", @str); |
158
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159
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0
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return $str . ")"; |
160
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} |
161
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} |
162
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163
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sub copyFrom { |
164
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0
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0
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0
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my ($this, $that) = @_; |
165
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166
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0
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$this->{'ref'} = $that->{'ref'}; |
167
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} |
168
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169
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sub bindUp { |
170
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0
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0
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0
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my ($this, $that, $env) = @_; |
171
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172
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0
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0
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if (!defined($env)) { |
173
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0
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confess("null environment"); |
174
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} |
175
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176
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0
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0
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if (! $this->homogeneous) { |
177
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0
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confess("Can not bind up against non-homogeneous array"); |
178
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} |
179
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180
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0
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0
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if ($that->homogeneous) { |
181
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0
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confess("Can not bind up homogeneous array to homogeneous array, unify instead"); |
182
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} |
183
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184
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0
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for (my $i = 0; $i <= $#{$that->ary}; $i++) { |
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0
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185
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0
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0
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if (!defined($env->unify($that->derefIndex($i, $env), $this->derefHomogeneous))) { |
186
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0
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return undef; |
187
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} |
188
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} |
189
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190
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0
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$that->copyFrom($this); |
191
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192
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0
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return $this; |
193
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} |
194
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195
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sub tupleUnify { |
196
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0
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0
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0
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my ($this, $that, $env) = @_; |
197
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198
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0
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0
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if (!defined($env)) { |
199
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0
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confess("null environment"); |
200
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} |
201
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202
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0
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0
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0
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if ($this->homogeneous || $that->homogeneous) { |
203
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0
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confess("Both inputs must not be homogeneous for tupleUnify"); |
204
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} |
205
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206
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0
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my $max = $this; |
207
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0
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my $min = $that; |
208
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209
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0
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0
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if ($#{$that->ary} > $#{$this->ary}) { |
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0
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0
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210
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0
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$max = $that; |
211
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0
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$min = $this; |
212
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} |
213
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214
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0
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for (my $i = 0; $i <= ($#{$max->ary}); $i++) { |
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0
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215
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0
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0
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if (!defined($env->unify($max->derefIndex($i, $env), $min->derefIndex($i, $env)))) { |
216
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0
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return undef; |
217
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} |
218
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} |
219
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220
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0
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$that->copyFrom($this); |
221
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222
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0
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return $this; |
223
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} |
224
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225
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sub unify { |
226
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0
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0
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0
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my ($this, $that, $env) = @_; |
227
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228
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0
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$this = $env->find($this); |
229
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0
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$that = $env->find($that); |
230
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231
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0
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0
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if ($this->type == $that->type) { |
232
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0
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0
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if ($this->homogeneous) { |
233
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0
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0
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if ($that->homogeneous) { |
234
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0
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0
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if ($env->unify($this->derefHomogeneous, $that->derefHomogeneous)) { |
235
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0
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return $this; |
236
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} else { |
237
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0
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return undef; |
238
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} |
239
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} else { |
240
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0
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return $this->bindUp($that, $env); |
241
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} |
242
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} else { |
243
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0
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0
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if ($that->homogeneous) { |
244
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0
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return $that->bindUp($this, $env); |
245
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} else { |
246
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0
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return $this->tupleUnify($that, $env); |
247
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} |
248
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} |
249
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} else { |
250
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0
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return undef; |
251
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} |
252
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} |
253
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254
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sub type { |
255
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0
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0
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1
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return Devel::TypeCheck::Type::O(); |
256
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} |
257
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258
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# Do the occurs check against $that with the given environment $env. |
259
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sub occurs { |
260
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0
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0
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0
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|
my ($this, $that, $env) = @_; |
261
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|
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262
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0
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0
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if ($that->type != Devel::TypeCheck::Type::VAR()) { |
263
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0
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|
die("Invalid type ", $that->str, " for occurs check"); |
264
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} |
265
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266
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0
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0
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if ($this->homogeneous) { |
267
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0
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|
return $this->derefHomogeneous->occurs($that, $env); |
268
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} else { |
269
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0
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for (my $i = 0; $i <= $#{$this->ary}; $i++) { |
|
0
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270
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0
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|
my $occurs = $this->derefIndex($i, $env)->occurs($that, $env); |
271
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0
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0
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return $occurs if ($occurs); |
272
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} |
273
|
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274
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0
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|
return FALSE(); |
275
|
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|
} |
276
|
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} |
277
|
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278
|
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sub referize { |
279
|
0
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|
|
0
|
1
|
|
my ($this, $env) = @_; |
280
|
|
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|
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|
281
|
0
|
0
|
|
|
|
|
if ($this->homogeneous) { |
282
|
0
|
|
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|
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|
return $env->genOmicron($env->genRho($this->derefHomogeneous())); |
283
|
|
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|
|
} else { |
284
|
0
|
|
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|
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|
my @ary; |
285
|
0
|
|
|
|
|
|
for (my $i = 0; $i <= $#{$this->ary}; $i++) { |
|
0
|
|
|
|
|
|
|
286
|
0
|
|
|
|
|
|
push(@ary, $env->genRho($this->derefIndex($i, $env))); |
287
|
|
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|
|
} |
288
|
|
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|
289
|
0
|
|
|
|
|
|
return $env->genOmicronTuple(@ary); |
290
|
|
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|
|
|
} |
291
|
|
|
|
|
|
|
} |
292
|
|
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|
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|
293
|
|
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|
|
# Append $that to $this: ($this, $that). Unify and promote to list where neccessary. |
294
|
|
|
|
|
|
|
sub append { |
295
|
0
|
|
|
0
|
1
|
|
my ($this, $that, $env, $root) = @_; |
296
|
|
|
|
|
|
|
|
297
|
0
|
|
|
|
|
|
$that = $env->find($that); |
298
|
|
|
|
|
|
|
|
299
|
0
|
0
|
|
|
|
|
if ($that->isa("Devel::TypeCheck::Type::Var")) { |
300
|
0
|
|
|
|
|
|
$that = $env->unify($that, $env->genOmicron()); |
301
|
|
|
|
|
|
|
} |
302
|
|
|
|
|
|
|
|
303
|
0
|
0
|
|
|
|
|
if ($that->is(Devel::TypeCheck::Type::VAR())) { |
304
|
0
|
|
|
|
|
|
$that = $env->unify($that, $env->freshKappa()); |
305
|
0
|
0
|
|
|
|
|
return undef if (!defined($that)); |
306
|
|
|
|
|
|
|
} |
307
|
|
|
|
|
|
|
|
308
|
0
|
|
|
|
|
|
my $ret; |
309
|
0
|
0
|
|
|
|
|
if ($this->homogeneous) { |
310
|
0
|
0
|
0
|
|
|
|
if ($that->is(Devel::TypeCheck::Type::O())) { |
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
311
|
0
|
|
|
|
|
|
$ret = $env->unify($that, $root); |
312
|
|
|
|
|
|
|
} elsif ($that->is(Devel::TypeCheck::Type::X())) { |
313
|
0
|
|
|
|
|
|
my $list = $that->listCoerce($env); |
314
|
0
|
0
|
|
|
|
|
if ($list) { |
315
|
0
|
|
|
|
|
|
$ret = $env->unify($list, $root); |
316
|
|
|
|
|
|
|
} else { |
317
|
0
|
|
|
|
|
|
$ret = undef; |
318
|
|
|
|
|
|
|
} |
319
|
|
|
|
|
|
|
} elsif ($that->is(Devel::TypeCheck::Type::K()) || |
320
|
|
|
|
|
|
|
$that->is(Devel::TypeCheck::Type::Z())) { |
321
|
0
|
|
|
|
|
|
$ret = $env->unify($env->genOmicron($that), $root); |
322
|
|
|
|
|
|
|
} else { |
323
|
0
|
|
|
|
|
|
confess("Unknown type in append"); |
324
|
|
|
|
|
|
|
} |
325
|
|
|
|
|
|
|
} else { |
326
|
0
|
0
|
0
|
|
|
|
if ($that->is(Devel::TypeCheck::Type::O())) { |
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
327
|
0
|
0
|
|
|
|
|
if ($that->homogeneous) { |
328
|
0
|
|
|
|
|
|
$ret = $env->unify($root, $that); |
329
|
|
|
|
|
|
|
} else { |
330
|
0
|
|
|
|
|
|
my $list = $env->genOmicron($env->freshKappa); |
331
|
0
|
|
|
|
|
|
my $tl = $env->unify($that, $list); |
332
|
0
|
0
|
|
|
|
|
if ($tl) { |
333
|
0
|
|
|
|
|
|
$ret = $env->unify($root, $tl); |
334
|
|
|
|
|
|
|
} else { |
335
|
0
|
|
|
|
|
|
$ret = undef; |
336
|
|
|
|
|
|
|
} |
337
|
|
|
|
|
|
|
} |
338
|
|
|
|
|
|
|
} elsif ($that->is(Devel::TypeCheck::Type::X())) { |
339
|
0
|
|
|
|
|
|
my $list = $that->listCoerce($env); |
340
|
0
|
0
|
|
|
|
|
if ($list) { |
341
|
0
|
|
|
|
|
|
$ret = $env->unify($list, $root); |
342
|
|
|
|
|
|
|
} else { |
343
|
0
|
|
|
|
|
|
$ret = undef; |
344
|
|
|
|
|
|
|
} |
345
|
|
|
|
|
|
|
} elsif ($that->is(Devel::TypeCheck::Type::K()) || |
346
|
|
|
|
|
|
|
$that->is(Devel::TypeCheck::Type::Z())) { |
347
|
0
|
|
|
|
|
|
$ret = $env->genOmicronTuple((@{$this->ary}, $that)); |
|
0
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
} else { |
349
|
0
|
|
|
|
|
|
confess("Unknown type in append"); |
350
|
|
|
|
|
|
|
} |
351
|
|
|
|
|
|
|
} |
352
|
|
|
|
|
|
|
|
353
|
0
|
|
|
|
|
|
return $ret; |
354
|
|
|
|
|
|
|
} |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
sub arity { |
357
|
0
|
|
|
0
|
1
|
|
my ($this) = @_; |
358
|
|
|
|
|
|
|
|
359
|
0
|
0
|
|
|
|
|
if ($this->homogeneous) { |
360
|
0
|
|
|
|
|
|
confess("Omicron is homogeneous"); |
361
|
|
|
|
|
|
|
} else { |
362
|
0
|
|
|
|
|
|
return ($#{$this->ary} + 1); |
|
0
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
} |
364
|
|
|
|
|
|
|
} |
365
|
|
|
|
|
|
|
|
366
|
|
|
|
|
|
|
TRUE; |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
=head1 AUTHOR |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
Gary Jackson, C<< >> |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
=head1 BUGS |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
This version is specific to Perl 5.8.1. It may work with other |
375
|
|
|
|
|
|
|
versions that have the same opcode list and structure, but this is |
376
|
|
|
|
|
|
|
entirely untested. It definitely will not work if those parameters |
377
|
|
|
|
|
|
|
change. |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
Please report any bugs or feature requests to |
380
|
|
|
|
|
|
|
C, or through the web interface at |
381
|
|
|
|
|
|
|
L. |
382
|
|
|
|
|
|
|
I will be notified, and then you'll automatically be notified of progress on |
383
|
|
|
|
|
|
|
your bug as I make changes. |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
=head1 COPYRIGHT & LICENSE |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
Copyright 2005 Gary Jackson, all rights reserved. |
388
|
|
|
|
|
|
|
|
389
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify it |
390
|
|
|
|
|
|
|
under the same terms as Perl itself. |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
=cut |