CONTENTS

• NAME
• VERSION
• SYNOPSIS
• DESCRIPTION
• SUBROUTINES
  • load_backend
  • curry
  • currym
  • copy_inline_refs
  • match
  • order_by
  • fill_brackets
  • is_type
  • is_format
  • derp
  • json_validator
• SEE ALSO
• AUTHOR
• COPYRIGHT AND LICENSE

#NAME

Yancy::Util - Utilities for Yancy

#VERSION

version 1.081

#SYNOPSIS

use Yancy::Util qw( load_backend );
my $be = load_backend( 'test://localhost', $schema );

use Yancy::Util qw( curry );
my $helper = curry( \&_helper_sub, @args );

use Yancy::Util qw( currym );
my $sub = currym( $object, 'method_name', @args );

use Yancy::Util qw( match );
if ( match( $where, $item ) ) {
    say 'Matched!';
}

use Yancy::Util qw( fill_brackets );
my $value = fill_brackets( $template, $item );

#DESCRIPTION

This module contains utility functions for Yancy.

#SUBROUTINES

#load_backend

my $backend = load_backend( $backend_url, $schema );
my $backend = load_backend( { $backend_name => $arg }, $schema );
my $backend = load_backend( $db_object, $schema );

Get a Yancy backend from the given backend URL, or from a hash reference with a backend name and optional argument. The $schema hash is the configured JSON schema for this backend.

A backend URL should begin with a name followed by a colon. The first letter of the name will be capitalized, and used to build a class name in the Yancy::Backend namespace.

The $backend_name should be the name of a module in the Yancy::Backend namespace. The $arg is handled by the backend module. Read your backend module's documentation for details.

The $db_object can be one of: Mojo::Pg, Mojo::mysql, Mojo::SQLite, or a subclass of DBIx::Class::Schema. The appropriate backend object will be created.

See "Database Backend" in Yancy::Guides::Schema for information about backend URLs and Yancy::Backend for more information about backend objects.

#curry

my $curried_sub = curry( $sub, @args );

Return a new subref that, when called, will call the passed-in subref with the passed-in @args first.

For example:

my $add = sub {
    my ( $lop, $rop ) = @_;
    return $lop + $rop;
};
my $add_four = curry( $add, 4 );
say $add_four->( 1 ); # 5
say $add_four->( 2 ); # 6
say $add_four->( 3 ); # 7

This is more-accurately called partial application, but curry is shorter.

#currym

my $curried_sub = currym( $obj, $method, @args );

Return a subref that, when called, will call given $method on the given $obj with any passed-in @args first.

See "curry" for an example.

#copy_inline_refs

my $subschema = copy_inline_refs( $schema, '/user' );

Given:

a "source" JSON schema (will not be mutated)

a JSON Pointer into the source schema, from which to be copied

will return another, copied standalone JSON schema, with any $ref either copied in, or if previously encountered, with a $ref to the new location.

#match

my $bool = match( $where, $item );

Test if the given $item matches the given SQL::Abstract $where data structure. See "WHERE CLAUSES" in SQL::Abstract for the full syntax.

Not all of SQL::Abstract's syntax is supported yet, so patches are welcome.

#order_by

my $ordered_array = order_by( $order_by, $unordered_array );

Order the given arrayref by the given SQL::Abstract order-by clause.

#fill_brackets

my $string = fill_brackets( $template, $item );

This routine will fill in the given template string with the values from the given $item hashref. The template contains field names within curly braces. Values in the $item hashref will be escaped with "xml_escape" in Mojo::Util.

my $item = {
    name => 'Doug Bell',
    email => 'doug@example.com',
    quote => 'I <3 Perl',
};

# Doug Bell <doug@example.com>
fill_brackets( '{name} <{email}>', $item );

# I &lt;3 Perl
fill_brackets( '{quote}', $item );

#is_type

my $bool = is_type( $schema->{properties}{myprop}{type}, 'boolean' );

Returns true if the given JSON schema type value (which can be a string or an array of strings) contains the given value, allowing the given type for the property.

# true
is_type( 'boolean', 'boolean' );
is_type( [qw( boolean null )], 'boolean' );
# false
is_type( 'string', 'boolean' );
is_type( [qw( string null )], 'boolean' );

#is_format

my $bool = is_format( $schema->{properties}{myprop}{format}, 'date-time' );

Returns true if the given JSON schema format value (a string) is the given value.

# true
is_format( 'date-time', 'date-time' );
# false
is_format( 'email', 'date-time' );

#derp

derp "This feature is deprecated in file '%s'", $file;

Print out a deprecation message as a warning. A message will only be printed once for each set of arguments from each caller.

#json_validator

my $json_validator = json_validator( $schema );

Build a JSON::Validator object for the given schema, adding all the necessary attributes.

#SEE ALSO

Yancy

#AUTHOR

Doug Bell <preaction@cpan.org>

#COPYRIGHT AND LICENSE

This software is copyright (c) 2021 by Doug Bell.

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