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use strict; |
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use warnings; |
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our $VERSION = '0.48'; |
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use Role::Tiny::With; |
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use Specio::OO; |
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with 'Specio::Constraint::Role::Interface'; |
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__PACKAGE__->_ooify; |
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1; |
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# ABSTRACT: Class for simple (non-parameterized or specialized) types |
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=pod |
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=encoding UTF-8 |
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=head1 NAME |
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Specio::Constraint::Simple - Class for simple (non-parameterized or specialized) types |
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=head1 VERSION |
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version 0.48 |
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=head1 SYNOPSIS |
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my $str = t('Str'); |
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print $str->name; # Str |
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my $parent = $str->parent; |
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if ( $str->value_is_valid($value) ) { ... } |
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$str->validate_or_die($value); |
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my $code = $str->inline_coercion_and_check('$_[0]'); |
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=head1 DESCRIPTION |
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This class implements simple type constraints, constraints without special |
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properties or parameterization. |
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It does not actually contain any real code of its own. The entire |
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implementation is provided by the L<Specio::Constraint::Role::Interface> role, |
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but the primary API for type constraints is documented here. |
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All other type constraint classes in this distribution implement this API, |
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except where otherwise noted. |
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=head1 API |
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This class provides the following methods. |
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=head2 Specio::Constraint::Simple->new(...) |
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This creates a new constraint. It accepts the following named parameters: |
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=over 4 |
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=item * name => $name |
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This is the type's name. The name is optional, but if provided it must be a |
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string. |
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=item * parent => $type |
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The type's parent type. This must be an object which does the |
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L<Specio::Constraint::Role::Interface> role. |
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This parameter is optional. |
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=item * constraint => sub { ... } |
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A subroutine reference implementing the constraint. It will be called as a |
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method on the object and passed a single argument, the value to check. |
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It should return true or false to indicate whether the value matches the |
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constraint. |
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87
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This parameter is mutually exclusive with C<inline_generator>. |
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You can also pass this option with the key C<where> in the parameter list. |
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91
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=item * inline_generator => sub { ... } |
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This should be a subroutine reference which returns a string containing a |
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single term. This code should I<not> end in a semicolon. This code should |
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implement the constraint. |
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The generator will be called as a method on the constraint with a single |
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argument. That argument is the name of the variable being coerced, something |
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like C<'$_[0]'> or C<'$var'>. |
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The inline generator is expected to include code to implement both the current |
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type and all its parents. Typically, the easiest way to do this is to write a |
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subroutine something like this: |
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105
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sub { |
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my $self = shift; |
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my $var = shift; |
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109
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return $_[0]->parent->inline_check( $_[1] ) |
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. ' and more checking code goes here'; |
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} |
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This parameter is mutually exclusive with C<constraint>. |
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You can also pass this option with the key C<inline> in the parameter list. |
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=item * inline_environment => {} |
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This should be a hash reference of variable names (with sigils) and values for |
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that variable. The values should be I<references> to the values of the |
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variables. |
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123
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This environment will be used when compiling the constraint as part of a |
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subroutine. The named variables will be captured as closures in the generated |
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subroutine, using L<Eval::Closure>. |
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It should be very rare to need to set this in the constructor. It's more likely |
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that a special type subclass would need to provide values that it generates |
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internally. |
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If you do set this, you are responsible for generating variable names that |
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won't clash with anything else in the inlined code. |
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This parameter defaults to an empty hash reference. |
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=item * message_generator => sub { ... } |
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A subroutine to generate an error message when the type check fails. The |
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default message says something like "Validation failed for type named Int |
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declared in package Specio::Library::Builtins |
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(.../Specio/blib/lib/Specio/Library/Builtins.pm) at line 147 in sub named |
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(eval) with value 1.1". |
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You can override this to provide something more specific about the way the type |
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failed. |
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147
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The subroutine you provide will be called as a subroutine, I<not as a method>, |
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with two arguments. The first is the description of the type (the bit in the |
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message above that starts with "type named Int ..." and ends with "... in sub |
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named (eval)". This description says what the thing is and where it was |
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defined. |
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153
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The second argument is the value that failed the type check, after any |
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coercions that might have been applied. |
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156
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You can also pass this option with the key C<message> in the parameter list. |
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=item * declared_at => $declared_at |
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160
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This parameter must be a L<Specio::DeclaredAt> object. |
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This parameter is required. |
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164
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=back |
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166
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It is possible to create a type without a constraint of its own. |
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168
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=head2 $type->name |
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170
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Returns the name of the type as it was passed the constructor. |
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172
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=head2 $type->parent |
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174
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Returns the parent type passed to the constructor. If the type has no parent |
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this returns C<undef>. |
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177
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=head2 $type->is_anon |
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Returns false for named types, true otherwise. |
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181
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=head2 $type->is_a_type_of($other_type) |
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183
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Given a type object, this returns true if the type this method is called on is |
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a descendant of that type or is that type. |
185
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186
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=head2 $type->is_same_type_as($other_type) |
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188
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Given a type object, this returns true if the type this method is called on is |
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the same as that type. |
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191
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=head2 $type->coercions |
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193
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Returns a list of L<Specio::Coercion> objects which belong to this constraint. |
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195
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=head2 $type->coercion_from_type($name) |
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197
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Given a type name, this method returns a L<Specio::Coercion> object which |
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coerces from that type, if such a coercion exists. |
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200
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=head2 $type->validate_or_die($value) |
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202
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This method does nothing if the value is valid. If it is not, it throws a |
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L<Specio::Exception>. |
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205
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=head2 $type->value_is_valid($value) |
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Returns true or false depending on whether the C<$value> passes the type |
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constraint. |
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210
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=head2 $type->has_real_constraint |
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212
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This returns true if the type was created with a C<constraint> or |
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C<inline_generator> parameter. This is used internally to skip type checks for |
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types that don't actually implement a constraint. |
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216
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=head2 $type->description |
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218
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This returns a string describing the type. This includes the type's name and |
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where it was declared, so you end up with something like C<'type named Foo |
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declared in package My::Lib (lib/My/Lib.pm) at line 42'>. If the type is |
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anonymous the name will be "anonymous type". |
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223
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=head2 $type->id |
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225
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This is a unique id for the type as a string. This is useful if you need to |
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make a hash key based on a type, for example. This should be treated as an |
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essentially arbitrary and opaque string, and could change at any time in the |
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future. If you want something human-readable, use the C<< $type->description >> |
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method. |
230
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231
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=head2 $type->add_coercion($coercion) |
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This adds a new L<Specio::Coercion> to the type. If the type already has a |
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coercion from the same type as the new coercion, it will throw an error. |
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=head2 $type->has_coercion_from_type($other_type) |
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This method returns true if the type can coerce from the other type. |
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=head2 $type->coerce_value($value) |
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This attempts to coerce a value into a new value that matches the type. It |
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checks all of the type's coercions. If it finds one which has a "from" type |
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that accepts the value, it runs the coercion and returns the new value. |
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If it cannot find a matching coercion it returns the original value. |
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=head2 $type->inline_coercion_and_check($var) |
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Given a variable name, this returns a string of code and an environment hash |
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that implements all of the type's coercions as well as the type check itself. |
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This will throw an exception unless both the type and all of its coercions are |
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inlinable. |
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The generated code will throw a L<Specio::Exception> if the type constraint |
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fails. If the constraint passes, then the generated code returns the (possibly |
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coerced) value. |
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The return value is a two-element list. The first element is the code. The |
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second is a hash reference containing variables which need to be in scope for |
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the code to work. This is intended to be passed to L<Eval::Closure>'s |
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C<eval_closure> subroutine. |
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The returned code is a single C<do { }> block without a terminating semicolon. |
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=head2 $type->inline_assert($var) |
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Given a variable name, this generates code that implements the constraint and |
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throws an exception if the variable does not pass the constraint. |
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The return value is a two-element list. The first element is the code. The |
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second is a hash reference containing variables which need to be in scope for |
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the code to work. This is intended to be passed to L<Eval::Closure>'s |
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C<eval_closure> subroutine. |
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=head2 $type->inline_check($var) |
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Given a variable name, this returns a string of code that implements the |
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constraint. If the type is not inlinable, this method throws an error. |
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=head2 $type->inline_coercion($var) |
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Given a variable name, this returns a string of code and an environment hash |
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that implements all of the type's coercions. I<It does not check that the |
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resulting value is valid.> |
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This will throw an exception unless all of the type's coercions are inlinable. |
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The return value is a two-element list. The first element is the code. The |
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second is a hash reference containing variables which need to be in scope for |
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the code to work. This is intended to be passed to L<Eval::Closure>'s |
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C<eval_closure> subroutine. |
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The returned code is a single C<do { }> block without a terminating semicolon. |
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=head2 $type->inline_environment() |
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This returns a hash defining the variables that need to be closed over when |
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inlining the type. The keys are full variable names like C<'$foo'> or |
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C<'@bar'>. The values are I<references> to a variable of the matching type. |
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=head2 $type->coercion_sub |
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305
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This method returns a sub ref that takes a single argument and applied all |
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relevant coercions to it. This sub ref will use L<Sub::Quote> if all the type's |
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coercions are inlinable. |
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309
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This method exists primarily for the benefit of L<Moo>. |
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311
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=head1 OVERLOADING |
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313
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All constraints implement the following overloads: |
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315
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=head2 Subroutine De-referencing |
316
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317
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This is done for the benefit of L<Moo>. The returned subroutine uses |
318
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L<Sub::Quote> if the type constraint is inlinable. |
319
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320
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=head2 Stringification |
321
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322
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For non-anonymous types, this will be the type's name. For anonymous types, a |
323
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string like "__ANON__(Str)" is generated. However, this string should not be |
324
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expected to be stable across releases, so don't use it for things like equality |
325
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checks! |
326
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327
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=head2 Boolification |
328
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329
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This always returns true. |
330
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331
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=head2 String Equality (eq) |
332
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333
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This calls C<< $type->is_same_type_as($other) >> to compare the two types. |
334
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335
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=head1 ROLES |
336
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337
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This role does the L<Specio::Constraint::Role::Interface> and |
338
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|
L<Specio::Role::Inlinable> roles. |
339
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340
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=head1 SUPPORT |
341
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342
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Bugs may be submitted at L<https://github.com/houseabsolute/Specio/issues>. |
343
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344
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|
=head1 SOURCE |
345
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346
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The source code repository for Specio can be found at L<https://github.com/houseabsolute/Specio>. |
347
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348
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|
=head1 AUTHOR |
349
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350
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|
Dave Rolsky <autarch@urth.org> |
351
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352
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=head1 COPYRIGHT AND LICENSE |
353
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354
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|
|
This software is Copyright (c) 2012 - 2022 by Dave Rolsky. |
355
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356
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This is free software, licensed under: |
357
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358
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|
The Artistic License 2.0 (GPL Compatible) |
359
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360
|
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The full text of the license can be found in the |
361
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|
|
F<LICENSE> file included with this distribution. |
362
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363
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=cut |