MediaWiki

Extension:ArrayFunctions/Parser functions

< Extension:ArrayFunctions

ArrayFunctions provides the following parser functions.

Notes

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  • All keyword argument names are case-sensitive.
  • All string arguments support the following escape sequences:
\s for spaces
\n for newlines
\\ for backslashes
  • Parameters prefixed with a single asterisk (*) accept a variable number of positional arguments.
  • Parameters prefixed with a double asterisk (**) accept a variable number of named arguments.

Functions

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Construct an array or value
Name Description
#af_bool Cast a string to a boolean.
#af_float Cast a string to a float.
#af_int Cast a string to an integer.
#af_list Create a new list from values.
#af_object Create a new object from values.
#af_split Split a string based on a delimiter.
Extract information from an array
Name Description
#af_count Count the number of values in an array.
#af_exists Check whether a key or index exists in an array.
#af_get Retrieve an element from an array by index.
#af_isarray Check if a value is an array.
#af_print Print an array for debug purposes.
#af_search Searches an array for a value.
#af_show Show a value in a human-readable format.
Create an array from an existing array
Name Description
#af_difference Compute the difference between arrays.
#af_intersect Compute the intersection of arrays.
#af_keysort Sort a list of objects based on the values of a key.
#af_ksort Sort an array by key.
#af_merge Compute the union of arrays.
#af_push Add a value to the end of a list.
#af_set Set a value at an index.
#af_slice Extract a slice from an array.
#af_sort Sort a list.
#af_unique Remove duplicates from an array.
#af_unset Remove a value from an array by index.
Iterate over an array
Name Description
#af_foreach Iterate over an array.
#af_join Recursively join the items of an array together with a separator.
#af_map Apply a callback to each element of a list.
#af_reduce Iteratively reduce the array to a single value using a callback.
Miscellaneous functions
Name Description
#af_if Select one of two alternatives based on a predicate.
#af_stringmap Apply a callback to each value in a delimited string.
#af_template Invoke a template with the values in an array.
#af_trim Trim characters at the start and end of a string.

af_bool

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ArrayFunctions version
≥ 1.0

This parser function casts a string to a boolean. This is useful for creating an array containing a boolean.

Description

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{{#af_bool: value }}

Parameters

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value : string or boolean
The value to cast to a boolean.

Return values

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Returns the casted boolean.

Examples

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Create an opaque representation of a boolean 
{{#af_bool: yes }}, {{#af_bool: no }}, {{#af_bool: true }}
 boolean__^__1, boolean__^__0, boolean__^__1
Create an array containing a boolean 
{{#af_print: {{#af_list: {{#af_bool: yes}} }} }}
  • 0: true

af_count

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ArrayFunctions version
≥ 1.0

This parser functions counts the number of values in an array.

Description

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{{#af_count: array | recursive=recursive }}

Parameters

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array : array
The array to count.
recursive : boolean, default=false
Whether to count items recursively. Note that elements containing a list are also counted (see examples below).

Return values

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The number of items in the array.

Examples

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Count the number of items in a one-dimensional list 
{{#af_print: {{#af_count: {{#af_list: a | b | c }} }} }}
 3
Count the number of items in a multi-dimensional list 
{{#af_print: {{#af_count: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} }} }}
 2
Recursively count the number of items in a multi-dimensional list 
{{#af_print: {{#af_count: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} | recursive=true }} }}
 6

af_difference

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ArrayFunctions version
≥ 1.5
 
The difference between three arrays

This parser function computes the difference between arrays. This function preserves keys. Two values are considered equal if their string representation is the same (see array_diff on PHP.net).

Description

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{{#af_difference: array | *arrays }}

Parameters

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array : array
The first array.
*arrays : array
The other arrays.

Return values

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Returns an array containing all values from array that are not present in any of the arrays in arrays. The keys in array are preserved.

Examples

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Compute the difference of three arrays 
{{#af_print: {{#af_difference: {{#af_list: a | b | c }} | {{#af_list: a }} | {{#af_list: b}} }} }}
  • 2: c

af_exists

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ArrayFunctions version
≥ 1.0

This parser function checks whether the given key or index exists in the given array.

Description

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{{#af_exists: array | key }}

Parameters

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array : array
The array to check.
key : string or int
The key to check.

Return values

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Returns true if array contains key, false otherwise.

Examples

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Check if a key exists 
{{#af_print: {{#af_exists: {{#af_object: hello=world }} | hello }} }}
 true
Check if an index exists 
{{#af_print: {{#af_exists: {{#af_list: a | b | c }} | 2 }} }}
 true
Check if a nested key exists 
{{#af_print: {{#af_exists: {{#af_get: {{#af_list: a | {{#af_list: b | c }} }} | 1 }} | 2 }} }}
 false

af_float

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ArrayFunctions version
≥ 1.0

This parser function casts a string to a float. This is useful for creating an array containing a float.

Description

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{{#af_float: value }}

Parameters

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value : string or float
The value to cast to a float.

Return values

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Returns the casted float.

Examples

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Create an opaque representation of a float 
{{#af_float: 1.298 }}, {{#af_float: 0 }}
 float__^__1.298, float__^__0
Create an array containing a float 
{{#af_print: {{#af_list: {{#af_float: 1.298 }} }} }}
  • 0: 1.298

af_foreach

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ArrayFunctions version
≥ 1.0

This parser function provides a way to iterate over arrays.

Description

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{{#af_foreach: array | key_name | value_name | body | delimiter=delimiter }}

Parameters

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array : array
The array over which to iterate.
key_name : string, default=null
The name to use for the key.
value_name : string, default=null
The name to use for the value.
body : string
The body to return for each iteration.
delimiter : string, default=""
The delimiter to put between results.

Return values

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Returns the resulting wikitext.

Examples

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Iterate over a list 
{{#af_foreach: {{#af_list: John | Steve | Harry }} | | name | Hello, {{{name}}}!<br/> }}
 Hello, John!
Hello, Steve!
Hello, Harry!
Iterate over an object 
{{#af_foreach: {{#af_object: Hello=John | Hi=Steve | Welcome=Harry }} | greeting | name | {{{greeting}}}, {{{name}}}!<br/> }}
 Hello, John!
Hi, Steve!
Welcome, Harry!
Iterate over a list and add a delimiter 
{{#af_foreach: {{#af_list: John | Steve | Harry }} | | name | Hello, {{{name}}}! | delimiter=<br/> }}
 Hello, John!
Hello, Steve!
Hello, Harry!

af_get

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ArrayFunctions version
≥ 1.0

This parser function retrieves the element with the given index from the given array. If the index does not exist, the empty string is returned.

Description

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{{#af_get: array | *indices }}

Parameters

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array : array
The array in which to index.
*indices : string
The index. Multiple indices can be given to index nested arrays.

Return values

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Returns the indexed value, or the empty string if the index does not exist.

Examples

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Get a top-level element 
{{#af_get: {{#af_list: a | b | c }} | 1 }}
 b
Get a subarray 
{{#af_print: {{#af_get: {{#af_list: a | {{#af_list: b | c }} }} | 1 }} }}
  • 0: b
  • 1: c
Get a nested element 
{{#af_get: {{#af_list: a | {{#af_object: hello=world }} }} | 1 | hello }}
world

af_if

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ArrayFunctions version
≥ 1.0

This parser function selects one of two alternatives based on the given predicate.

Description

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{{#af_if: predicate | consequent | alternative }}

Parameters

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predicate : boolean
The predicate.
consequent : string
The value to return if the predicate holds (i.e. is true).
alternative : string, default=""
The value to return if the predicate does not hold (i.e. is false).

Return values

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Returns the consequent if the predicate holds, or the alternative if it is given and the predicate does not hold.

Examples

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Check if a value is an array 
{{#af_if: {{#af_isarray: not an array }} | A beautiful array! | Not an array! }}
 Not an array!

af_int

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ArrayFunctions version
≥ 1.0

This parser function casts a string to an integer. This is useful for creating an array containing an integer.

Description

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{{#af_int: value }}

Parameters

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value : string or int
The value to cast to an integer.

Return values

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Returns the casted integer.

Examples

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Create an opaque representation of an integer 
{{#af_int: 42 }}, {{#af_int: -12 }}
 integer__^__42, integer__^__-12
Create an array containing an integer 
{{#af_print: {{#af_list: {{#af_int: -129}} }} }}
  • 0: -129

af_intersect

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ArrayFunctions version
≥ 1.2
 
The intersection of three arrays

This parser function computes the intersection of arrays. This function preserves keys. Two values are considered equal if their string representation is the same (see array_intersect on PHP.net).

Description

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{{#af_intersect: array | *arrays }}

Parameters

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array : array
The first array.
*arrays : array
The other arrays.

Return values

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Returns the intersection of the given arrays.

Examples

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Compute the intersection of two identical arrays 
{{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: a | b | c }} }} }}
  • 0: a
  • 1: b
  • 2: c
Compute the intersection of two partially overlapping arrays 
{{#af_print: {{#af_intersect: {{#af_list: a | b | c }} | {{#af_list: c | d | e }} }} }}
  • 2: c

af_isarray

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ArrayFunctions version
≥ 1.0

This parser function checks if the given value is an array.

Description

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{{#af_isarray: value }}

Parameters

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value : mixed
The value to check.

Return values

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Returns true if value is an array, false otherwise.

Examples

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Check if an array is an array 
{{#af_print: {{#af_isarray: {{#af_list: a | b | c }} }} }}
 true
Check if a string is an array 
{{#af_print: {{#af_isarray: Hello, World! }} }}
 false

af_join

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ArrayFunctions version
≥ 1.0

This parser function recursively joins the items of an array together with a given separator.

Description

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{{#af_join: array | glue }}

Parameters

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array : array
The array to join.
glue : string, default=""
The string used to join each item.

Return values

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Returns the joined array.

Examples

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Join a one-dimensional array 
{{#af_join: {{#af_list: a | b | c }} }}
 abc
Join a one-dimensional array using a separator 
{{#af_join: {{#af_list: a | b | c }} | \s-\s }}
 a - b - c
Join a multi-dimensional array using a separator 
{{#af_join: {{#af_list: a | b | {{#af_list: c | d }} }} | \s-\s }}
 a - b - c - d

af_keysort

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ArrayFunctions version
≥ 1.0

This parser function sorts a list of objects based on the values of the specified key. To sort an array by key, use #af_ksort.

Description

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{{#af_keysort: array | key | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

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array : array
The array to sort.
key : string
The key of the values on which the sort should be based.
descending : boolean, default=false
Whether to sort in a descending order.
caseinsensitive : boolean, default=false
Whether to ignore case when sorting.

Return values

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Returns the sorted array.

Examples

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Sort based on age 
{{#af_print: {{#af_keysort: {{#af_list:
    {{#af_object: name=John | age=56 }} |
    {{#af_object: name=Harry | age=12 }} |
    {{#af_object: name=Bob | age=24 }}
}} | age }} }}
  • 0
    • name: Harry
    • age: 12
  • 1
    • name: Bob
    • age: 24
  • 2
    • name: John
    • age: 56
Sort based on age, in descending order 
{{#af_print: {{#af_keysort: {{#af_list:
    {{#af_object: name=John | age=56 }} |
    {{#af_object: name=Harry | age=12 }} |
    {{#af_object: name=Bob | age=24 }}
}} | age | descending=true }} }}
  • 0
    • name: John
    • age: 56
  • 1
    • name: Bob
    • age: 24
  • 2
    • name: Harry
    • age: 12

af_ksort

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ArrayFunctions version
≥ 1.7

This parser function sorts an array by key.

Description

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{{#af_ksort: array | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

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array : array
The array to sort.
descending : boolean, default=false
Whether to sort in a descending order.
caseinsensitive : boolean, default=false
Whether to ignore case when sorting.

Return values

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Returns the sorted array.

Examples

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Sort by key 
{{#af_print: {{#af_ksort: {{#af_object: c=banana | a=orange | b=apple }}
  • a: orange
  • b: apple
  • c: banana

af_list

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ArrayFunctions version
≥ 1.0

This parser function creates a new list from the given parameters.

Description

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{{#af_list: *values }}

Parameters

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*values : mixed
The values for the list.

Return values

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Returns the resulting list.

Examples

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Create a simple one-dimensional list 
{{#af_print: {{#af_list: a | b | c }} }}
  • 0: a
  • 1: b
  • 2: c
Create a multi-dimensional list 
{{#af_print: {{#af_list: {{#af_list: a | b }} | {{#af_list: c | d }} }} }}
  • 0
    • 0: a
    • 1: b
  • 1
    • 0: c
    • 1: d
Create a list of objects 
{{#af_print: {{#af_list:
    {{#af_object: name=Harry | age=22 }} |
    {{#af_object: name=Bobby | age=29 }}
}} }}
  • 0
    • name: Harry
    • age: 22
  • 1
    • name: Bobby
    • age: 29

af_map

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ArrayFunctions version
≥ 1.0

This parser function applies a callback to each element of a list.

Description

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{{#af_map: array | value_name | callback }}

Parameters

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array : array
The array to run through the callback.
value_name : string
The name to give to the value in the callback.
callback : string
The callback to apply to each element of the array.

Return values

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Returns the resulting mapped array.

Examples

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Appending a string to each element 
{{#af_print: {{#af_map: {{#af_list: a | b | c }} | v | {{{v}}}-appended }} }}
  • 0: a-appended
  • 1: b-appended
  • 2: c-appended
Altering list elements 
{{#af_print: {{#af_map: {{#af_list: {{#af_list: a }} | {{#af_list: b }} }} | v | {{#af_push: {{{v}}} | c }} }} }}
  • 0
    • 0: a
    • 1: c
  • 1
    • 0: b
    • 1: c

af_merge

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ArrayFunctions version
≥ 1.2
 
The union of three arrays

This parser function computes the union of arrays. It merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one.

If the input arrays have the same string key, then the later value for that key will overwrite the previous one. If the arrays contain numeric keys, later values will be appended instead and the later keys will be renumbered.

Description

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{{#af_merge: array | *arrays }}

Parameters

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array : array
The first array.
*arrays : array
The other arrays.

Return values

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Returns the union of the given arrays.

Examples

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Appending a string to each element 
{{#af_print: {{#af_merge: {{#af_list: a | b | c }} | {{#af_list: d | e | f }} }} }}
  • 0: a
  • 1: b
  • 2: c
  • 3: d
  • 4: e
  • 5: f

af_object

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ArrayFunctions version
≥ 1.0

This parser function creates a new object from the given parameters.

Description

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{{#af_object: **values }}

Parameters

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**values : mixed
The values for the object.

Return values

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Returns the resulting object.

Examples

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Create a simple one-dimensional object 
{{#af_print: {{#af_object: a=b | b=c | c=d }} }}
  • a: b
  • b: c
  • c: d
Create a multi-dimensional object 
{{#af_print: {{#af_object: head={{#af_object: title=MediaWiki | meta={{#af_list: {{#af_object: charset=UTF-8 }} }} }} }} }}
  • head
    • title: MediaWiki
    • meta
      • 0
        • charset: UTF-8

af_print

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ArrayFunctions version
≥ 1.0

This parser function prints the given value for debug purposes. Unlike #af_show, it does not parse the value, but does support printing lists and objects. This function should only be used for debug purposes. Consider using #af_show to display a value to the reader.

Description

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{{#af_print: *values | end=end }}

Parameters

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*values : mixed
The values to print.
end : string, default=""
The string to append to the end of each printed value.

Return values

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Returns the value in human-readable form.

Examples

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Print a boolean 
{{#af_print: {{#af_bool: yes }} }}
 true
Print a list 
{{#af_print: {{#af_list: a | b | c }} }}
  • 0: a
  • 1: b
  • 2: c

af_push

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ArrayFunctions version
≥ 1.0

This parser function adds the given value to the end of the list.

Description

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{{#af_push: array | value }}

Parameters

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array : array
The array to append the value to.
value : mixed
The value to add.

Return values

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Returns the array with the value appended.

Examples

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Push a value 
{{#af_print: {{#af_push: {{#af_list: a | b }} | c }} }}
  • 0: a
  • 1: b
  • 2: c

af_reduce

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ArrayFunctions version
≥ 1.2

This parser function iteratively reduces the array to a single value using a callback. It iteratively applies callable to the elements of the given array, so as to reduce the array to a single value. The callable is passed the value of the current iteration, as well as the result of the previous iteration.

Description

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{{#af_reduce: array | carry_name | value_name | callable | initial }}

Parameters

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array : array
The array to reduce.
carry_name : string
The name to use for the carry.
value_name : string
The name to use for the value.
callable : string
The callback to use for each iteration.
initial : string, default=""
The initial carry to use.

Return values

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Returns the resulting value.

Examples

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Using reduction to concatenate values 
{{#af_reduce: {{#af_list: a | b | c }} | c | i | {{{c}}}{{{i}}} }}
 abc
Using reduction to reverse and then concatenate values 
{{#af_reduce: {{#af_list: a | b | c }} | c | i | {{{i}}}{{{c}}} }}
 cba
Using reduction to build an equation 
{{#af_reduce: {{#af_list: 2 | 3 | 5 | 7 | 11 }} | c | i | {{{c}}} + {{{i}}} | 0 }}
 0 + 2 + 3 + 5 + 7 + 11
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ArrayFunctions version
≥ 1.3

This parser function searches the given array for the given value, and returns the first corresponding key if the value is found.

Description

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{{#af_search: array | value }}

Parameters

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array : array
The array to search in.
value : mixed
The value to search for.

Return values

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Returns the first corresponding key if the value is found, nothing otherwise.

Examples

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Search for a value in an array 
{{#af_print: {{#af_search: {{#af_list: a | b | c }} | b }} }}
 1

af_set

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ArrayFunctions version
≥ 1.0

This parser function sets the given value for the given index.

Description

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{{#af_set: value | array | *indices }}

Parameters

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value : mixed
The value to set the index to.
array : array
To array in which to set the index.
*indices : string
The index to set. Multiple indices can be given to index nested arrays.

Return values

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Returns the array with the given index set to the given value.

Examples

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Replace an existing value 
{{#af_print: {{#af_set: d | {{#af_list: a | b | c }} | 2 }} }}
  • 0: a
  • 1: b
  • 2: d
Create a new index 
{{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo }} }}
  • foo: bar
  • boo: far
Create a new subarray 
{{#af_print: {{#af_set: far | {{#af_object: foo=bar }} | boo | far }} }}
  • foo: bar
  • boo
    • far: far

af_show

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ArrayFunctions version
≥ 1.4

This parser function prints the given value in a human-readable format. Unlike #af_print, this parser function parses the value. It does not support showing lists or objects.

Description

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{{#af_show: value }}

Parameters

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value : mixed
The value to show.

Return values

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Returns the value in human-readable form.

Examples

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Show a value 
{{#af_show: Hello World! }}
 Hello World!

af_slice

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ArrayFunctions version
≥ 1.0

This parser function extracts a slice from the given array. Keys will be reset and reordered.

Description

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{{#af_slice: array | offset | length }}

Parameters

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array : array
The array to take a slice from.
offset : integer
The offset at which the slice starts. If non-negative, the slice will start at this given offset. If negative, the sequence will start that far from the end of the array.
length : integer, optional
The length of the slice. If the length is given and positive, then the slice will have that many elements in it. If the length is given and negative, then the slice will stop that many elements from the end of the array. If it is omitted, then the slice will have everything from offset up until the end of the array.

Return values

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The slice.

Examples

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Get the first two elements 
{{#af_print: {{#af_slice: {{#af_list: a | b | c }} | 0 | 2 }} }}
  • 0: a
  • 1: b
Get the last element 
{{#af_print: {{#af_slice: {{#af_list: a | b | c }} | -1 }} }}
  • 0: c

af_sort

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ArrayFunctions version
≥ 1.0

This parser function sorts the given list.

Description

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{{#af_sort: array | descending=descending | caseinsensitive=caseinsensitive }}

Parameters

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array : array
The array to sort.
descending : boolean, default=false
Whether to sort the list in descending order.
caseinsensitive : boolean, default=false
Whether to ignore case when sorting.

Return values

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Returns the sorted list.

Examples

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Sort a list in ascending order 
{{#af_print: {{#af_sort: {{#af_list: b | c | a }} }} }}
  • 0: a
  • 1: b
  • 2: c
Sort a list in descending order 
{{#af_print: {{#af_sort: {{#af_list: b | c | a }} | descending=true }} }}
  • 0: c
  • 1: b
  • 2: a

af_split

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ArrayFunctions version
≥ 1.1

This parser function splits the given string based on a delimiter.

Description

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{{#af_split: string | delimiter }}

Parameters

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string : string
The string to split.
delimiter : string, default=","
The delimiter to use.

Return values

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Returns the resulting list.

Examples

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Split a string based on commas 
{{#af_print: {{#af_split: a, b, c }} }}
  • 0: a
  • 1: b
  • 2: c
Split a sentence into words 
{{#af_print: {{#af_split: Lorem ipsum dolor et | \s }} }}
  • 0: Lorem
  • 1: ipsum
  • 2: dolor
  • 3: et

af_stringmap

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ArrayFunctions version
≥ 1.6

This parser function applies a callback to each item of a delimited string, and returns the result as a delimited string, optionally with a different delimiter. This function is similar to Page Forms' #arraymap parser function.

Description

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{{#af_stringmap: value | delimiter | value_name | callback | new_delimiter | conjunction }}

Parameters

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value : string
The delimited string.
delimiter : string
The delimiter to split value on. If the empty string is given, "," is used.
value_name : string
The name to give to the value in the callback.
callback : string
The callback to apply to each element of the array.
new_delimiter : string, default=", "
The new delimiter to insert in between the mapped items.
conjunction : string, default=null
The delimiter to place between the last two items. This allows you to create a more natural summation, such as "Alice, Bob and Eve". If no value is given, the value of new_delimiter is used.

Return values

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Returns the resulting delimited string.

Examples

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Turn each item into a link 
{{#af_stringmap: William Shakespeare, Stephen King, Mark Twain | , | x | [[{{{x}}}]] }}
 William Shakespeare, Stephen King, Mark Twain
Turn a comma-separated list into a human-readable list 
{{#af_stringmap: William Shakespeare, Stephen King, Mark Twain | , | x | {{{x}}} | ,\s | and }}
 William Shakespeare, Stephen King and Mark Twain

af_template

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ArrayFunctions version
≥ 1.0

This parser function will invoke the given template and pass the values in the given array as arguments.

Description

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{{#af_template: name | data }}

Parameters

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name : string
The name of the template to invoke. If no namespace is given, it is assumed the page is in the template namespace, otherwise the given namespace is used. The page must exist, must be includable and must be readable by the user, otherwise an error is given.
data : array
The data to pass to the parameters. Values with numeric indices are passed as positional arguments and values with string indices are passed as named arguments.

Return values

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The expanded template.

Examples

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Invoking a template with a list 
{{#af_template: Echo | {{#af_list: a | b }} }}
 
{{Echo|a|b}}
Invoking a template with an object 
{{#af_template: Echo | {{#af_object: foo=bar | boo=far }} }}
 
{{Echo|foo=bar|boo=far}}

af_trim

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ArrayFunctions version
≥ 1.8

This parser function will trim the given character from the beginning and the end of the given string.

Description

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{{#af_trim: string | characters }}

Parameters

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string : string
The string that will be trimmed.
characters : string
The characters to trim.

Return values

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The trimmed string.

Examples

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Trimming a string 
{{#af_trim: !a! | ! }}
 
a
Trimming every string in a list 
{{#af_print: {{#af_map: {{#af_list: !a! | !b! | !c! }} | v | {{#af_trim: {{{v}}} | ! }} }} }}
  • 0: a
  • 1: b
  • 2: c

af_unique

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ArrayFunctions version
≥ 1.0

This parser function removes duplicate values from the given array. This function does not reset keys.

Description

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{{#af_unique: array }}

Parameters

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array : array
The array from which to remove duplicates.

Return values

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Returns the array with duplicates removed.

Examples

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Remove duplicates from an array 
{{#af_print: {{#af_unique: {{#af_list: a | a | b | c | b }} }} }}
  • 0: a
  • 2: b
  • 3: c

af_unset

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ArrayFunctions version
≥ 1.0

This parser function removes the value associated with the given index from the array and returns the result. Numeric keys are not reset after calling this function.

Description

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{{#af_unset: array | *indices }}

Parameters

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array : array
The array from which to remove the given key.
*indices : string
The index to remove. Multiple indices can be given to index nested arrays.

Return values

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Returns the array with the given index removed.

Examples

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Remove a top-level index 
{{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 2 }} }}
  • 0: a
  • 1: b
Remove a top-level index, keys not reset 
{{#af_print: {{#af_unset: {{#af_list: a | b | c }} | 1 }} }}
  • 0: a
  • 2: c
Remove a nested index 
{{#af_print: {{#af_unset: {{#af_object: foo={{#af_object: bar=quz | far=buz }} }} | foo | bar }} }}
  • foo
    • far: buz
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