NAME

Data::Sah::Resolve - Resolve Sah schema

VERSION

This document describes version 0.008 of Data::Sah::Resolve (from Perl distribution Data-Sah-Resolve), released on 2021-02-27.

SYNOPSIS

 use Data::Sah::Resolve qw(resolve_schema);

 my $sch = resolve_schema("int");
 # => ["int", []]

 my $sch = resolve_schema("posint*");
 # => ["int", [{min=>1}, {req=>1}]

 my $sch = resolve_schema([posint => div_by => 3]);
 # => ["int", {min=>1}, {div_by=>3}]

 my $sch = resolve_schema(["posint", "merge.delete.min"=>undef, div_by => 3]);
 # => ["int", {div_by=>3}]

DESCRIPTION

FUNCTIONS

resolve_schema([ \%opts, ] $sch) => sch

Sah schemas can be defined in terms of other schemas. The resolving process follows the base schema recursively until it finds a builtin type as the base.

This routine performs the following steps:

1. Normalize the schema

Unless schema_is_normalized option is true, in which case schema is assumed to be normalized already.

2. Check if the schema's type is a builtin type

Currently this is done by checking if the module of the name Data::Sah::Type::<type> is loadable. If it is a builtin type then we are done.

3. Check if the schema's type is the name of another schema

This is done by checking if Sah::Schema::<name> module exists and is loadable. If this is the case then we retrieve the base schema from the $schema variable in the Sah::Schema::<name> package and repeat the process while accumulating and/or merging the clause sets.

4. If schema's type is neither, we die.

Returns [base_type, clause_sets]. If return_intermediates option is true, then the third elements will be the list of intermediate schema names.

Example 1: int.

First we normalize to ["int",{},{}]. The type is int and it is a builtin type (Data::Sah::Type::int exists) so the final result is ["int", []].

Example 2: posint*.

First we normalize to ["posint",{req=>1},{}]. The type is posint and it is the name of another schema (Sah::Schema::posint). We retrieve the schema which is ["int", {summary=>"Positive integer (1,2,3,...)", min=>1}, {}]. We now try to resolve int and find that it's a builtin type. So the final result is: ["int", [ {req=>1}, {summary=>"Positive integer (1,2,3,...)", min=>1} ]].

Known options:

• schema_is_normalized => bool (default: 0)

  When set to true, function will skip normalizing schema and assume input schema is normalized.

• merge_clause_sets => bool (default: 1)

• return_intermediates => bool

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Data-Sah-Resolve.

SOURCE

Source repository is at https://github.com/perlancar/perl-Data-Sah-Resolve.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Data-Sah-Resolve

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

SEE ALSO

Sah, Data::Sah

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2021, 2017, 2016 by perlancar@cpan.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm Data::Sah::Resolve

perl -MCPAN -e shell
install Data::Sah::Resolve