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package Data::ValidateInterdependent; |
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use utf8; |
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use v5.14; |
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use warnings; |
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our $VERSION = '0.000001'; |
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use Moo; |
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use Carp; |
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=encoding UTF-8 |
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=head1 NAME |
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Data::ValidateInterdependent - safely validate interdependent parameters |
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=head1 SYNOPSIS |
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use Data::ValidateInterdependent; |
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state $validator = |
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Data::ValidateInterdependent->new |
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# inject a constant value |
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->const(generator => 'perl') |
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# take an input parameter without validation |
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->param('description') |
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# create variables "x", "y", "z" from parameter "coords" |
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->validate(['x', 'y', 'z'], '$coords', sub { |
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my ($coords) = @_; |
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die "Coords must contain 3 elements" unless @$coords == 3; |
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my ($x, $y, $z) = @$coords; |
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return { x => $x, y => $y, z => $z }; |
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}) |
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# create variable "title" from parameter "title" |
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# and from validated variables "x", "y", "z". |
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->validate('title', ['$title, 'x', 'y', 'z'], sub { |
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my ($title, $x, $y, $z) = @_; |
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$title //= "Object at ($x, $y, $z)"; |
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return { title => $title }; |
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}); |
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my $variables = $validator->run(%config); |
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=head1 DESCRIPTION |
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45
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The problem: you need to validate some configuration. |
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But validation of one field depends on other fields, |
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or default values are taken from other parts of the config. |
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These dependencies can be daunting. |
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50
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This module makes the dependencies between different validation steps |
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more explicit: |
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Each step declares which variables it provides, |
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and which variables or input parameters it consumes. |
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The idea of |
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L |
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allows us to check basic consistency properties when the validator is assembled: |
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=over |
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=item * |
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The validator will provide all declared output variables. |
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Because there is no branching, |
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it is not possible to forget a variable. |
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=item * |
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All variables are declared before they are used. |
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It is not possible to accidentally read an unvalidated value. |
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=item * |
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Each variable is only initialized once. |
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It is not possible to accidentally overwrite a variable. |
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76
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=back |
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78
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=head2 Terminology |
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80
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A B is an unvalidated input value. |
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A parameter called C can be addressed with the symbol C<$name>, |
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i.e. with a prepended C<$> character. |
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If no such parameter exists, its value will be C. |
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85
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A B is a validated field that will be written exactly once. |
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A variable called C is addressed with the symbol C, |
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i.e. without any changes. |
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A B is a callback that initializes one or more variables. |
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It receives a list with any number of parameters and variables. |
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92
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=head1 METHODS |
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Unless explicitly noted, |
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all methods return the object itself |
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so that you can chain methods. |
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=cut |
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100
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# the static environment |
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has _variables => ( |
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is => 'ro', |
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default => sub { {} }, |
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); |
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106
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has _unused_variables => ( |
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is => 'ro', |
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default => sub { {} }, |
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); |
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has _rules => ( |
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is => 'ro', |
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default => sub { [] }, |
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); |
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116
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has _known_params => ( |
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is => 'ro', |
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default => sub { {} }, |
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); |
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121
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has _ignore_unknown => ( |
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is => 'rw', |
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default => 0, |
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); |
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126
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sub _parse_params { |
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30
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my ($spec) = @_; |
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30
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100
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75
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return @$spec if ref $spec eq 'ARRAY'; |
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return $spec; |
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} |
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sub _declare_variable { |
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my ($self, @names) = @_; |
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135
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my $known = $self->_variables; |
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my $unused = $self->_unused_variables; |
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for my $var (@names) { |
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if ($known->{$var}) { |
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1
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croak qq(Variable cannot be declared twice: $var); |
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} |
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else { |
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$known->{$var} = 1; |
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$unused->{$var} = 1; # all are unused initially |
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} |
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} |
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147
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return; |
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} |
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150
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sub _declare_usage { |
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my ($self, $name, @vars) = @_; |
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153
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my $known_variables = $self->_variables; |
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my $unused = $self->_unused_variables; |
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156
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100
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if (my @unknown = grep { not $known_variables->{$_} } @vars) { |
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157
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croak qq($name depends on undeclared variables: ), join q(, ) => sort @unknown; |
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} |
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160
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delete @$unused{@vars}; |
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162
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return; |
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} |
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165
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sub _declare_param { |
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my ($self, @names) = @_; |
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my $known_params = $self->_known_params; |
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169
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$known_params->{$_} = 1 for @names; |
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171
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return; |
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} |
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174
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=head2 const |
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176
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$validator = $validator->const(name => $value, ...); |
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178
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Declare one or more variables with a constant value. |
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180
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In most cases this is not necessary |
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because you could use Perl variables |
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to make data accessible to all pipeline steps. |
183
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184
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Note that this method cannot provide default values for a variable, |
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since all variables are write-once. |
186
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187
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This method is functionally equivalent to: |
188
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189
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$validator->validate(['name', ...], [], sub { |
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return { name => $value, ... }; |
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}); |
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193
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=cut |
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195
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sub const { |
196
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4
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my ($self, %values) = @_; |
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# TODO must not be empty |
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199
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_declare_variable($self, sort keys %values); |
200
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push @{ $self->_rules }, [const => \%values]; |
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15
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201
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return $self; |
202
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} |
203
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204
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=head2 param |
205
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206
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$validator = $validator->param('name', { variable => 'parameter' }, ...); |
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208
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Declare variables that take their value directly from input parameters |
209
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without any validation. |
210
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211
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The arguments may be variable names, |
212
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in which case the value is taken from the parameter of the same name. |
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The arguments may also be a hash ref, |
214
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which maps variable names to parameters. |
215
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These names are not symbols, |
216
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so you must not include the C<$> for parameter symbols. |
217
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218
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Absolutely no validation will be performed. |
219
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If the parameter does not exist, the variable will be C. |
220
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221
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This method is functionally equivalent to: |
222
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223
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$validator->validate(['name', 'variable', ...], ['$name', '$parameter'], sub { |
224
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my ($name, $parameter, ...) = @_; |
225
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return { name => $name, variable => $parameter, ... }; |
226
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}); |
227
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228
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=cut |
229
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230
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sub param { |
231
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6
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6
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1
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15
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my ($self, @items) = @_; |
232
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# TODO must not be empty |
233
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234
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6
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my %mapping; |
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6
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for my $item (@items) { |
236
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9
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100
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31
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$item = { $item => $item } if ref $item ne 'HASH'; |
237
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34
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@mapping{ keys %$item } = values %$item; |
238
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} |
239
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240
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_declare_param($self, sort values %mapping); |
241
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20
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_declare_variable($self, sort keys %mapping); |
242
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243
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6
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8
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push @{ $self->_rules }, [param => \%mapping]; |
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6
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20
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244
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245
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6
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32
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return $self; |
246
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} |
247
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248
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=head2 validate |
249
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250
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$validator = $validator->validate($output, $input, sub { ... }); |
251
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252
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Perform a validation step. |
253
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254
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B<$output> declares the variables which are assigned by this validation step. |
255
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It may either be a single variable name, |
256
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or an array ref with one or more variable names. |
257
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258
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B<$input> declares dependencies on other variables or input parameters. |
259
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It may either be a single symbol, |
260
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or an array ref of symbols. |
261
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The array ref may be empty. |
262
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A symbol can be the name of a variable, |
263
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or a C<$> followed by the name of a parameter. |
264
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265
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B is a callback that peforms the validation step. |
266
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The callback will be invoked with the values of all I<$input> symbols, |
267
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in the order in which they were listed. |
268
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Note that a parameter will have C value if it doesn't exist. |
269
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The callback must return a hash ref that contains all variables to be assigned. |
270
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The hash keys must match the declared I<$output> variables exactly. |
271
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272
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The returned hash ref will be modified. |
273
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If other code depends on this hash ref, return a copy instead. |
274
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275
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B when an existing variable was re-declared. |
276
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All variables are write-once. |
277
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You cannot reassign them. |
278
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279
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B when an undeclared variable was used. |
280
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You must declare all variables before you can use them. |
281
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282
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B Reading multiple inputs: |
283
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284
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# "x" and "y" are previously declared variables. |
285
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# "foo" is an input parameter. |
286
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|
$validator->validate('result', ['x', '$foo', 'y'], sub { |
287
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|
my ($x, $foo, $y) = @_; |
288
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|
$foo //= $y; |
289
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|
return { result => $x + $foo }; |
290
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|
}); |
291
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292
|
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|
=cut |
293
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294
|
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|
|
sub validate { |
295
|
15
|
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15
|
1
|
91
|
my ($self, $output, $input, $callback) = @_; |
296
|
15
|
|
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|
29
|
$output = [_parse_params($output)]; |
297
|
15
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|
29
|
$input = [_parse_params($input)]; |
298
|
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299
|
15
|
100
|
|
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|
36
|
if (not @$output) { |
300
|
1
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|
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|
9
|
croak q(Validation rule must provide at least one variable); |
301
|
|
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|
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|
|
} |
302
|
|
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303
|
14
|
|
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|
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21
|
my @vars; |
304
|
|
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|
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|
|
my @args; |
305
|
14
|
|
|
|
|
26
|
for (@$input) { |
306
|
8
|
100
|
|
|
|
22
|
if (/^\$/) { |
307
|
1
|
|
|
|
|
7
|
push @args, s/^\$//r; |
308
|
|
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|
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|
|
} |
309
|
|
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|
|
else { |
310
|
7
|
|
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|
|
14
|
push @vars, $_; |
311
|
|
|
|
|
|
|
} |
312
|
|
|
|
|
|
|
} |
313
|
|
|
|
|
|
|
|
314
|
14
|
100
|
|
|
|
31
|
_declare_param($self, @args) if @args; |
315
|
14
|
|
|
|
|
82
|
_declare_usage($self, qq(Validation rule "@$output"), @vars); |
316
|
13
|
|
|
|
|
33
|
_declare_variable($self, @$output); |
317
|
|
|
|
|
|
|
|
318
|
12
|
|
|
|
|
19
|
push @{ $self->_rules }, [rule => $output, $input, $callback]; |
|
12
|
|
|
|
|
34
|
|
319
|
12
|
|
|
|
|
41
|
return $self; |
320
|
|
|
|
|
|
|
} |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
=head2 run |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
my $variables = $validator->run(%params); |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
Run the validator with a given set of params. |
327
|
|
|
|
|
|
|
A validator instance can be run multiple times. |
328
|
|
|
|
|
|
|
|
329
|
|
|
|
|
|
|
B<%params> is a hash of all input parameters. |
330
|
|
|
|
|
|
|
The hash may be empty. |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
B a hashref with all output variables. |
333
|
|
|
|
|
|
|
If your validation rules assigned helper variables, |
334
|
|
|
|
|
|
|
you may want to delete them from this hashref before further processing. |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
B when unknown parameters were provided |
337
|
|
|
|
|
|
|
(but see L). |
338
|
|
|
|
|
|
|
|
339
|
|
|
|
|
|
|
B when a rule callback did not return a suitable value: |
340
|
|
|
|
|
|
|
either it was not a hash ref, |
341
|
|
|
|
|
|
|
or the hash ref did not assign exactly the $output variables. |
342
|
|
|
|
|
|
|
|
343
|
|
|
|
|
|
|
=cut |
344
|
|
|
|
|
|
|
|
345
|
|
|
|
|
|
|
sub run { |
346
|
17
|
|
|
17
|
1
|
238
|
my ($self, %params) = @_; |
347
|
|
|
|
|
|
|
|
348
|
17
|
100
|
|
|
|
90
|
unless ($self->_ignore_unknown) { |
349
|
16
|
|
|
|
|
32
|
my $known_params = $self->_known_params; |
350
|
16
|
100
|
|
|
|
49
|
if (my @unknown = grep { not $known_params->{$_} } keys %params) { |
|
11
|
|
|
|
|
34
|
|
351
|
3
|
|
|
|
|
38
|
croak qq(Unknown parameters: ), join q(, ) => sort @unknown; |
352
|
|
|
|
|
|
|
} |
353
|
|
|
|
|
|
|
} |
354
|
|
|
|
|
|
|
|
355
|
14
|
|
|
|
|
23
|
my %variables; |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
my $get_arg = sub { |
358
|
4
|
|
|
4
|
|
7
|
my ($name) = @_; |
359
|
4
|
100
|
|
|
|
15
|
return $params{$name} if $name =~ s/^\$//; |
360
|
3
|
|
|
|
|
9
|
return $variables{$name}; |
361
|
14
|
|
|
|
|
78
|
}; |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
RULE: |
364
|
14
|
|
|
|
|
26
|
for my $rule (@{ $self->_rules }) { |
|
14
|
|
|
|
|
48
|
|
365
|
13
|
|
|
|
|
66
|
my ($type, @rule_args) = @$rule; |
366
|
|
|
|
|
|
|
|
367
|
13
|
100
|
|
|
|
34
|
if ($type eq 'const') { |
368
|
2
|
|
|
|
|
6
|
my ($values) = @rule_args; |
369
|
2
|
|
|
|
|
10
|
@variables{keys %$values} = values %$values; |
370
|
2
|
|
|
|
|
9
|
next RULE; |
371
|
|
|
|
|
|
|
} |
372
|
|
|
|
|
|
|
|
373
|
11
|
100
|
|
|
|
23
|
if ($type eq 'param') { |
374
|
2
|
|
|
|
|
3
|
my ($mapping) = @rule_args; |
375
|
2
|
|
|
|
|
7
|
@variables{ keys %$mapping } = @params{ values %$mapping }; |
376
|
2
|
|
|
|
|
5
|
next RULE; |
377
|
|
|
|
|
|
|
} |
378
|
|
|
|
|
|
|
|
379
|
9
|
50
|
|
|
|
21
|
if ($type eq 'rule') { |
380
|
9
|
|
|
|
|
18
|
my ($provided, $required, $callback) = @rule_args; |
381
|
|
|
|
|
|
|
|
382
|
9
|
|
|
|
|
20
|
my $result = $callback->(map { $get_arg->($_) } @$required); |
|
4
|
|
|
|
|
8
|
|
383
|
|
|
|
|
|
|
|
384
|
9
|
|
|
|
|
71
|
for my $var (@$provided) { |
385
|
11
|
100
|
|
|
|
24
|
if (exists $result->{$var}) { |
386
|
10
|
|
|
|
|
21
|
$variables{$var} = delete $result->{$var}; |
387
|
|
|
|
|
|
|
} |
388
|
|
|
|
|
|
|
else { |
389
|
1
|
|
|
|
|
14
|
croak qq(Validation rule "@$provided" must return parameter $var); |
390
|
|
|
|
|
|
|
} |
391
|
|
|
|
|
|
|
} |
392
|
|
|
|
|
|
|
|
393
|
8
|
100
|
|
|
|
27
|
if (my @unknown = keys %$result) { |
394
|
1
|
|
|
|
|
21
|
croak qq(Validation rule "@$provided" returned unknown variables: ), |
395
|
|
|
|
|
|
|
join q(, ) => sort @unknown; |
396
|
|
|
|
|
|
|
} |
397
|
|
|
|
|
|
|
|
398
|
7
|
|
|
|
|
26
|
next RULE; |
399
|
|
|
|
|
|
|
} |
400
|
|
|
|
|
|
|
|
401
|
0
|
|
|
|
|
0
|
die "Unknown rule type: $type"; |
402
|
|
|
|
|
|
|
} |
403
|
|
|
|
|
|
|
|
404
|
12
|
|
|
|
|
71
|
return \%variables; |
405
|
|
|
|
|
|
|
} |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
=head2 ignore_unknown |
408
|
|
|
|
|
|
|
|
409
|
|
|
|
|
|
|
$validator = $validator->ignore_unknown; |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
Ignore unknown parameters. |
412
|
|
|
|
|
|
|
If this flag is not set, the L method will die |
413
|
|
|
|
|
|
|
when unknown parameters were provided. |
414
|
|
|
|
|
|
|
A parameter is unknown when no validation rule or param assignment |
415
|
|
|
|
|
|
|
reads from that parameter. |
416
|
|
|
|
|
|
|
|
417
|
|
|
|
|
|
|
=cut |
418
|
|
|
|
|
|
|
|
419
|
|
|
|
|
|
|
sub ignore_unknown { |
420
|
1
|
|
|
1
|
1
|
3
|
my ($self) = @_; |
421
|
1
|
|
|
|
|
5
|
$self->_ignore_unknown(1); |
422
|
1
|
|
|
|
|
4
|
return $self; |
423
|
|
|
|
|
|
|
} |
424
|
|
|
|
|
|
|
|
425
|
|
|
|
|
|
|
=head2 ignore_param |
426
|
|
|
|
|
|
|
|
427
|
|
|
|
|
|
|
$validator = $validator->ignore_param($name, ...); |
428
|
|
|
|
|
|
|
|
429
|
|
|
|
|
|
|
Ignore a specific parameter. |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
=cut |
432
|
|
|
|
|
|
|
|
433
|
|
|
|
|
|
|
sub ignore_param { |
434
|
1
|
|
|
1
|
1
|
4
|
my ($self, @names) = @_; |
435
|
1
|
|
|
|
|
5
|
_declare_param($self, @names); |
436
|
1
|
|
|
|
|
11
|
return $self; |
437
|
|
|
|
|
|
|
} |
438
|
|
|
|
|
|
|
|
439
|
|
|
|
|
|
|
=head2 provided |
440
|
|
|
|
|
|
|
|
441
|
|
|
|
|
|
|
my @names = $validator->provided; |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
Get a list of all provided variables. |
444
|
|
|
|
|
|
|
The order is unspecified. |
445
|
|
|
|
|
|
|
|
446
|
|
|
|
|
|
|
=cut |
447
|
|
|
|
|
|
|
|
448
|
|
|
|
|
|
|
sub provided { |
449
|
1
|
|
|
1
|
1
|
3
|
my ($self) = @_; |
450
|
1
|
|
|
|
|
2
|
return keys %{ $self->_variables }; |
|
1
|
|
|
|
|
6
|
|
451
|
|
|
|
|
|
|
} |
452
|
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
=head2 unused |
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
my @names = $validator->unused; |
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
Get a list of all variables that are provided but not used. |
458
|
|
|
|
|
|
|
The order is unspecified. |
459
|
|
|
|
|
|
|
|
460
|
|
|
|
|
|
|
=cut |
461
|
|
|
|
|
|
|
|
462
|
|
|
|
|
|
|
sub unused { |
463
|
2
|
|
|
2
|
1
|
6
|
my ($self) = @_; |
464
|
2
|
|
|
|
|
4
|
return keys %{ $self->_unused_variables }; |
|
2
|
|
|
|
|
12
|
|
465
|
|
|
|
|
|
|
} |
466
|
|
|
|
|
|
|
|
467
|
|
|
|
|
|
|
=head2 select |
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
$validator = $validator->select(@names); |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
Mark variables as used, and ensure that these variables exist. |
472
|
|
|
|
|
|
|
|
473
|
|
|
|
|
|
|
This is convenient when the validator is assembled in different places, |
474
|
|
|
|
|
|
|
and you want to make sure that certain variables are provided. |
475
|
|
|
|
|
|
|
|
476
|
|
|
|
|
|
|
The output variables may include variables that were not selected. |
477
|
|
|
|
|
|
|
This method does not list all output variables, |
478
|
|
|
|
|
|
|
but just ensures their presence. |
479
|
|
|
|
|
|
|
|
480
|
|
|
|
|
|
|
=cut |
481
|
|
|
|
|
|
|
|
482
|
|
|
|
|
|
|
sub select :method { |
483
|
2
|
|
|
2
|
1
|
7
|
my ($self, @names) = @_; |
484
|
2
|
|
|
|
|
7
|
_declare_usage($self, q(Select), @names); |
485
|
1
|
|
|
|
|
2
|
return $self; |
486
|
|
|
|
|
|
|
} |
487
|
|
|
|
|
|
|
|
488
|
|
|
|
|
|
|
=head1 SUPPORT |
489
|
|
|
|
|
|
|
|
490
|
|
|
|
|
|
|
Homepage: L |
491
|
|
|
|
|
|
|
|
492
|
|
|
|
|
|
|
Bugtracker: L |
493
|
|
|
|
|
|
|
|
494
|
|
|
|
|
|
|
=head1 AUTHOR |
495
|
|
|
|
|
|
|
|
496
|
|
|
|
|
|
|
amon – Lukas Atkinson (cpan: AMON) |
497
|
|
|
|
|
|
|
|
498
|
|
|
|
|
|
|
=head1 COPYRIGHT |
499
|
|
|
|
|
|
|
|
500
|
|
|
|
|
|
|
Copyright 2017 Lukas Atkinson |
501
|
|
|
|
|
|
|
|
502
|
|
|
|
|
|
|
This library is free software and may be distributed under the same terms |
503
|
|
|
|
|
|
|
as perl itself. See http://dev.perl.org/licenses/. |
504
|
|
|
|
|
|
|
|
505
|
|
|
|
|
|
|
=cut |
506
|
|
|
|
|
|
|
|
507
|
|
|
|
|
|
|
1; |