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package Devel::TypeCheck::Type::Chi; |
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=head1 NAME |
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Devel::TypeCheck::Type::Chi - Represents hashes. |
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=head1 SYNOPSIS |
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use Devel::TypeCheck::Type::Chi; |
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=head1 DESCRIPTION |
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This class represents the Chi (capital 'X') terminal in the type |
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language. As such, it maintains type information for hashes. This |
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class is similar to Omicron. This class inherits from the |
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Devel::TypeCheck::Type and Devel::TypeCheck::TSub classes. |
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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 $i (@SUBTYPES) { |
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$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[$index]); |
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} |
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# **** INSTANCE **** |
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sub new { |
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my ($name, $type) = @_; |
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my $this = {}; |
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$this->{'ref'} = newRef($type); |
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return bless($this, $name); |
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} |
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sub newRef { |
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my ($type) = @_; |
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my $ref = {}; |
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if (defined($type)) { |
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$ref->{'hsh'} = undef; |
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$ref->{'homogeneous'} = TRUE; |
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$ref->{'subtype'} = $type; |
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} else { |
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$ref->{'hsh'} = {}; |
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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, $env) = @_; |
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if ($this->homogeneous) { |
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return $this->derefHomogeneous; |
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} else { |
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if (!exists($this->hsh->{$index})) { |
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$this->hsh->{$index} = $env->freshKappa(); |
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} |
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return $this->hsh->{$index}; |
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} |
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} |
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sub hsh { |
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my ($this) = @_; |
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return $this->{'ref'}->{'hsh'}; |
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} |
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sub subtype { |
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return undef; |
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} |
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99
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sub derefHomogeneous { |
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my ($this) = @_; |
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return $this->{'ref'}->{'subtype'}; |
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} |
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sub homogeneous { |
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my ($this) = @_; |
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return $this->{'ref'}->{'homogeneous'}; |
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} |
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sub str { |
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my ($this, $env) = @_; |
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if ($this->homogeneous) { |
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return "{* => " . $this->derefHomogeneous->str($env) . "}"; |
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} else { |
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my $str = "{"; |
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my @str = (); |
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foreach my $i (keys %{$this->hsh}) { |
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push(@str, "\"" . $i . "\" => " . $this->derefIndex($i, $env)->str($env)); |
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} |
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122
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0
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$str .= join(",", @str); |
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124
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0
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return $str . "}"; |
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} |
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} |
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128
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sub pretty { |
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1
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my ($this, $env) = @_; |
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131
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if ($this->homogeneous) { |
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return "ASSOCIATIVE ARRAY of {" . $this->derefHomogeneous->pretty($env) . "}"; |
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} else { |
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0
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my $str = "RECORD of {"; |
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136
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my @str = (); |
137
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foreach my $i (keys %{$this->hsh}) { |
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138
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push(@str, "\"" . $i . "\" => " . $this->derefIndex($i, $env)->pretty($env)); |
139
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} |
140
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141
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0
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$str .= join(", ", @str); |
142
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143
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0
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return $str . "}"; |
144
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} |
145
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} |
146
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147
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sub copyFrom { |
148
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0
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0
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0
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my ($this, $that) = @_; |
149
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150
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0
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$this->{'ref'} = $that->{'ref'}; |
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} |
152
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153
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sub bindUp { |
154
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0
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0
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0
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my ($this, $that, $env) = @_; |
155
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156
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0
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0
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if (! $this->homogeneous) { |
157
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0
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confess("Can not bind up against non-homogeneous hash"); |
158
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} |
159
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160
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0
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0
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if ($that->homogeneous) { |
161
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0
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confess("Can not bind up homogeneous hash to homogeneous hash, unify instead"); |
162
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} |
163
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164
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0
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foreach my $i (keys(%{$that->hsh})) { |
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0
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165
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0
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0
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if (!defined($env->unify($this->derefIndex($i, $env), $this->derefHomogeneous))) { |
166
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0
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return undef; |
167
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} |
168
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} |
169
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170
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0
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$that->copyFrom($this); |
171
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172
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0
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return $this; |
173
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} |
174
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175
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sub recordUnify { |
176
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0
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0
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0
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my ($this, $that, $env) = @_; |
177
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178
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0
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0
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0
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if ($this->homogeneous || $that->homogeneous) { |
179
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0
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confess("Both inputs must not be homogeneous for recordUnify"); |
180
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} |
181
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182
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0
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my %keys; |
183
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184
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0
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foreach my $i (keys(%{$this->hsh})) { |
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0
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185
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0
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$keys{$i} = TRUE; |
186
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} |
187
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188
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0
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foreach my $i (keys(%{$that->hsh})) { |
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0
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189
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0
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$keys{$i} = TRUE; |
190
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} |
191
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192
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0
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foreach my $i (keys(%keys)) { |
193
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0
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0
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if (!defined($env->unify($this->derefIndex($i, $env), ($that->derefIndex($i, $env))))) { |
194
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0
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return undef; |
195
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} |
196
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} |
197
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198
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0
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$that->copyFrom($this); |
199
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200
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0
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return $this; |
201
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} |
202
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203
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sub unify { |
204
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0
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0
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0
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my ($this, $that, $env) = @_; |
205
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206
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0
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$this = $env->find($this); |
207
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0
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$that = $env->find($that); |
208
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209
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0
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0
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if ($this->type == $that->type) { |
210
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0
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0
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if ($this->homogeneous) { |
211
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0
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0
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if ($that->homogeneous) { |
212
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0
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return $env->unify($this->derefHomogeneous, $that->derefHomogeneous); |
213
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} else { |
214
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0
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return $this->bindUp($that, $env); |
215
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} |
216
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} else { |
217
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0
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0
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if ($that->homogeneous) { |
218
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0
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return $that->bindUp($this, $env); |
219
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} else { |
220
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0
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return $this->recordUnify($that, $env); |
221
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} |
222
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} |
223
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} else { |
224
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0
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return undef; |
225
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} |
226
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} |
227
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228
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sub type { |
229
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0
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0
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1
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return Devel::TypeCheck::Type::X(); |
230
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} |
231
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232
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# Do the occurs check against $that with the given environment $env. |
233
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sub occurs { |
234
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0
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0
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0
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my ($this, $that, $env) = @_; |
235
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236
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0
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0
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if ($that->type != Devel::TypeCheck::Type::VAR()) { |
237
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0
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die("Invalid type ", $that->str, " for occurs check"); |
238
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} |
239
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240
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0
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0
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if ($this->homogeneous) { |
241
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0
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return $this->derefHomogeneous->occurs($that, $env); |
242
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} else { |
243
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0
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foreach my $i (keys %{$this->hsh}) { |
|
0
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244
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0
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my $occurs = $this->derefIndex($i, $env)->occurs($that, $env); |
245
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0
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0
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return $occurs if ($occurs); |
246
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} |
247
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248
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0
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return FALSE(); |
249
|
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} |
250
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} |
251
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252
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sub listCoerce { |
253
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0
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0
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1
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|
my ($this, $env) = @_; |
254
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|
255
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0
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|
my $t; |
256
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0
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0
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|
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|
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if (!$this->homogeneous) { |
257
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0
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|
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|
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|
my $t0 = $env->genChi($env->freshKappa); |
258
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0
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|
$t = $t0->subtype->bindUp($this, $env); |
259
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260
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0
|
0
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return undef if (!$t); |
261
|
|
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|
} else { |
262
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0
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|
$t = $this; |
263
|
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} |
264
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|
265
|
0
|
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|
|
my $type = $env->unify($t->derefHomogeneous, $env->freshUpsilon); |
266
|
0
|
0
|
|
|
|
|
return undef if (!$type); |
267
|
|
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|
268
|
0
|
|
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|
|
|
return $env->genOmicron($type); |
269
|
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|
} |
270
|
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|
271
|
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|
|
TRUE; |
272
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273
|
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|
|
=head1 AUTHOR |
274
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|
275
|
|
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|
|
Gary Jackson, C<< >> |
276
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|
277
|
|
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|
|
=head1 BUGS |
278
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|
279
|
|
|
|
|
|
|
This version is specific to Perl 5.8.1. It may work with other |
280
|
|
|
|
|
|
|
versions that have the same opcode list and structure, but this is |
281
|
|
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|
|
entirely untested. It definitely will not work if those parameters |
282
|
|
|
|
|
|
|
change. |
283
|
|
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|
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|
|
|
284
|
|
|
|
|
|
|
Please report any bugs or feature requests to |
285
|
|
|
|
|
|
|
C, or through the web interface at |
286
|
|
|
|
|
|
|
L. |
287
|
|
|
|
|
|
|
I will be notified, and then you'll automatically be notified of progress on |
288
|
|
|
|
|
|
|
your bug as I make changes. |
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
=head1 COPYRIGHT & LICENSE |
291
|
|
|
|
|
|
|
|
292
|
|
|
|
|
|
|
Copyright 2005 Gary Jackson, all rights reserved. |
293
|
|
|
|
|
|
|
|
294
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify it |
295
|
|
|
|
|
|
|
under the same terms as Perl itself. |
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
=cut |