NAME
JSON::Conditional - A conditional language within a JSON struct
VERSION
Version 1.01
SYNOPSIS
Quick summary of what the module does.
use JSON::Conditional;
my $c = JSON::Conditional->new();
my $json = '{
"for": {
"key": "countries",
"each": "countries",
"if": {
"m": "Thailand",
"key": "country",
"then": {
"rank": 1
}
},
"elsif": {
"m": "Indonesia",
"key": "country",
"then": {
"rank": 2
}
},
"else": {
"then": {
"rank": null
}
},
"country": "{country}"
}
}';
$json = $c->compile($json, {
countries => [
{ country => "Thailand" },
{ country => "Indonesia" },
{ country => "Japan" },
{ country => "Cambodia" },
]
});
...
{
"countries": [
{
"rank": 1,
"country": "Thailand"
},
{
"rank": 2,
"country": "Indonesia"
},
{
"rank": null,
"country": "Japan"
},
{
"rank": null,
"country": "Cambodia"
}
]
};METHODS
new
Instantiate a new JSON::Conditional object. Currently this expects no arguments.
my $c = JSON::Conditional->new;encode
Encode a perl struct into JSON.
$c->encode($struct);encode_file
Encode a perl struct into JSON file.
$c->encode_file($struct, $out_file);decode
Decode a JSON string into a perl struct.
$c->decode($json);decode_file
Decode a JSON file into a perl struct.
$c->decode_file($json_file);compile
Compile a json string or file containing valid JSON::Conditional markup into either a json string, json file or perl struct based upon the passed params.
$c->compile($json, $params); # json string
$c->compile($json, $params, 1); # perl struct
$c->compile($json, $params, 0, $out_file); # json fileMarkup or Markdown
keywords
if, elsif, else
If, elsif and else conditionals are logical blocks used within JSON::Conditional. They are comprised of a minimum of four parts, the keyword, the expression, 'key' and 'then'. The expression can be any that are defined in the expression section of this document. The 'key' is the value in the params that will be evaluated and the 'then' is the response that is returned if the expression is true.
my $json = '{
"if": {
"m": "Thailand",
"key": "country",
"then": {
"rank": 1
}
},
"elsif": {
"m": "Indonesia",
"key": "country",
"then": {
"rank": 2
}
},
"else": {
"then": {
"rank": null
}
},
"country": "{country}"
}';
$json = $c->compile($json, {
country => "Thailand"
}, 1);
...
{
country => 'Thailand',
rank => 1
}You can also write this like the following:
my $json = '{
"if": {
"m": "Thailand",
"key": "country",
"then": {
"rank": 1
},
"elsif": {
"m": "Indonesia",
"key": "country",
"then": {
"rank": 2
},
"else": {
"then": {
"rank": null
}
}
}
},
"country": "{country}"
}';
$json = $c->compile($json, {
country => "Indonesia"
}, 1);
...
{
country => 'Indonesia',
rank => 2
}given
Given conditionals are logical blocks used within JSON::Conditional. They are comprised of a minimum of three parts, the keyword, 'when' and'key'. The 'when' can either be an array or a hash of expression that are defined in the expression section of this document. The 'key' is the value in the params that will be evaluated. You can optionally provide a default which will be used when no 'when' expressions are matched.
my $json = '{
"given": {
"key": "country",
"default": {
"rank": null
},
"when": [
{
"m": "Thailand",
"then": {
"rank": 1
}
},
{
"m": "Indonesia",
"then": {
"rank": 2
}
}
]
},
"country": "{country}"
}';
my $compiled = $c->compile($json, {
country => 'Thailand'
}, 1);
...
{
country => 'Thailand'
rank => 1
}You can also write this like the following:
my $json = '{
"given": {
"key": "country",
"when": {
"Thailand": {
"rank": 1
},
"Indonesia": {
"rank": 2
},
"default": {
"rank": null
}
}
},
"country": "{country}"
}';
my $compiled = $c->compile($json, {
country => 'Indonesia'
}, 1);
...
{
country => 'Indonesia'
rank => 1
}or
The 'or' keyword allows you to chain expression checks, where only one expression has to match.
my $json = '{
"if": {
"m": "Thailand",
"key": "country",
"then": {
"rank": 1,
"country": "{country}"
},
"or": {
"key": "country",
"m": "Maldives",
"or": {
"key": "country",
"m": "Greece"
}
}
},
}';
my $compiled = $c->compile($json, {
country => 'Greece'
}, 1);
...
{
country => 'Greece'
rank => 1
}and
The 'and' keyword allows you to chain expression checks, where only all expression has to match.
my $json = '{
"if": {
"m": "Thailand",
"key": "country",
"then": {
"rank": 1,
"country": "{country}"
},
"and": {
"key": "season",
"m": "Summer"
}
}
}';
my $compiled = $c->compile($json, {
country => 'Thailand',
season => 'Summer'
}, 1);
...
{
country => 'Thailand'
rank => 1
}expressions
m
Does the params key value match the provided regex value.
{
"key": $param_key,
"m": $regex,
"then": \%then
}im
Does the params key value match the provided regex value case insensative.
{
"key": $param_key,
"im": $regex,
"then": \%then
}nm
Does the params key value not match the provided regex value.
{
"key": $param_key,
"nm": $regex,
"then": \%then
}inm
Does the params key value not match the provided regex value case insensative.
{
"key": $param_key,
"inm": $regex,
"then": \%then
}eq
Does the params key value equal the provided value.
{
"key": $param_key,
"eq": $equals,
"then": \%then
}ne
Does the params key value not equal the provided value.
{
"key": $param_key,
"ne": $equals,
"then": \%then
}gt
Is the params key value greater than the provided value.
{
"key": $param_key,
"gt": $greater_than,
"then": \%then
}lt
Is the params key value less than the provided value.
{
"key": $param_key,
"lt": $greater_than,
"then": \%then
}placeholders
All parameters that are passed into compile can be used as placeholders within the json. You can define a placeholder by enclosing a key in braces.
{
"placeholder": "{param_key}"
}loops
for
each
Expects key to reference a array in the passed params. It will then itterate each item in the array and build an array based upon which conditions/expressions are met.
my $json = '{
"for": {
"key": "countries",
"each": "countries",
"country": "{country}"
}
}';
$json = $c->compile($json, {
countries => [
{ country => "Thailand" },
{ country => "Indonesia" },
{ country => "Japan" },
{ country => "Cambodia" },
]
}, 1);
...
{
countries => [
{
country => "Thailand"
},
{
country => "Indonesia"
},
{
country => "Japan",
},
{
country => "Cambodia"
}
]
};keys
Expects key to reference a hash in the passed params. It will then itterate keys in the hash and build an hash based upon which conditions/expressions are met.
my $json = '{
"for": {
"key": "countries",
"keys": 1,
"country": "{country}"
},
}';
$json = $c->compile($json, {
countries => {
1 => { country => "Thailand" },
2 => { country => "Indonesia" },
3 => { country => "Japan" },
4 => { country => "Cambodia" },
}
}, 1);
...
{
1 => { country => "Thailand" },
2 => { country => "Indonesia" },
3 => { country => "Japan" },
4 => { country => "Cambodia" },
}
===================================================
my $json = '{
"for": {
"key": "countries",
"keys": "countries",
"country": "{country}"
},
}';
$json = $c->compile($json, {
countries => {
1 => { country => "Thailand" },
2 => { country => "Indonesia" },
3 => { country => "Japan" },
4 => { country => "Cambodia" },
}
}, 1);
...
{
countries => {
1 => { country => "Thailand" },
2 => { country => "Indonesia" },
3 => { country => "Japan" },
4 => { country => "Cambodia" },
}
}AUTHOR
LNATION, <email at lnation.org>
BUGS
Please report any bugs or feature requests to bug-json-conditional at rt.cpan.org, or through the web interface at https://rt.cpan.org/NoAuth/ReportBug.html?Queue=JSON-Conditional. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc JSON::ConditionalYou can also look for information at:
RT: CPAN's request tracker (report bugs here)
CPAN Ratings
Search CPAN
ACKNOWLEDGEMENTS
LICENSE AND COPYRIGHT
This software is Copyright (c) 2020->2021 by LNATION.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)