NAME

Template::Liquid::Filters - Default Filters Based on Liquid's Standard Set

Synopsis

Filters are simple methods that modify the output of numbers, strings, variables and objects. They are placed within an output tag {{ }} and are denoted by a pipe character |.

    # product.title = "Awesome Shoes"
    {{ product.title | upcase }}
    # Output: AWESOME SHOES

In the example above, product is the object, title is its attribute, and upcase is the filter being applied.

Some filters require a parameter to be passed.

    {{ product.title | remove: "Awesome" }}
    # Output: Shoes

Multiple filters can be used on one output. They are applied from left to right.

    {{ product.title | upcase | remove: "AWESOME"  }}
    # SHOES

Standard Filters

These are the current default filters. They have been written to behave exactly like their Ruby Liquid counterparts accept where Perl makes improvment irresistable.

`abs`

Returns the absolute value of a number.

    {{  4 | abs }} => 4
    {{ -4 | abs }} => 4

`append`

Append a string.

    {{ 'foo' | append:'bar' }} => 'foobar'

`at_least`

Limits a number to a minimum value.

        {{ 4 | at_least: 5 }} => 5
        {{ 4 | at_least: 3 }} => 4

`at_most`

Limits a number to a maximum value.

        {{ 4 | at_most: 5 }} => 4
        {{ 4 | at_most: 3 }} => 3

`capitalize`

Capitalize words in the input sentence. This filter first applies Perl's lc function and then the ucfirst function.

    {{ 'this is ONLY a test.' | capitalize }} => This is only a test.

`ceil`

Rounds an integer up to the nearest integer.

    {{ 4.6 | ceil }} => 5
    {{ 4.3 | ceil }} => 5

`compact`

Removes any undefined values from an array.

For this example, assume site.pages is an array of content pages for a website, and some of these pages have an attribute called category that specifies their content category. If we map those categories to an array, some of the array items might be undefined if any pages do not have a category attribute.

    {% assign all_categories = site.pages | map: "category" %}

    {% for item in all_categories %}
    - {{ item }}
    {% endfor %}

The output of this template would look like this:

    - business
    - celebrities
        -
    - lifestyle
    - sports
        -
    - technology

By using compact when we create our site_categories array, we can remove all the nil values in the array.

    {% assign all_categories = site.pages | map: "category" | compact %}

    {% for item in all_categories %}
    - {{ item }}
    {% endfor %}

The output of this template would look like this:

    - business
    - celebrities
    - lifestyle
    - sports
    - technology

`concat`

Concatenates (joins together) multiple arrays. The resulting array contains all the items from the input arrays.

  {% assign fruits = "apples, oranges, peaches" | split: ", " %}
  {% assign vegetables = "carrots, turnips, potatoes" | split: ", " %}

  {% assign everything = fruits | concat: vegetables %}

  {% for item in everything %}
  - {{ item }}
  {% endfor %}

...becomes...

  - apples
  - oranges
  - peaches
  - carrots
  - turnips
  - potatoes

You can string togehter concat filters to oin more than two array:

  {% assign furniture = "chairs, tables, shelves" | split: ", " %}
  {% assign vegetables = "carrots, turnips, potatoes" | split: ", " %}
  {% assign fruits = "apples, oranges, peaches" | split: ", " %}

  {% assign everything = fruits | concat: vegetables | concat: furniture %}

  {% for item in everything %}
  - {{ item }}
  {% endfor %}

...becomes...

  - apples
  - oranges
  - peaches
  - carrots
  - turnips
  - potatoes
  - chairs
  - tables
  - shelves

`date`

Converts a timestamp into another date format. The format for this syntax is the same as strftime.

  {{ article.published_at | date: "%a, %b %d, %y" }} => Fri, Jul 17, 15

  {{ article.published_at | date: "%Y" }} => 2015

date works on strings if they contain well-formatted dates:

  {{ "March 14, 2016" | date: "%b %d, %y" }} => Mar 14, 16

Natural language dates are parsed by DateTime::Format::Natural.

To get the current time, pass the special word <"now"> (or "today") to date:

  This page was last updated at {{ "now" | date: "%Y-%m-%d %H:%M" }}.
        => This page was last updated at 2019-09-19 17:48.

Note that the value will be the current time of when the page was last generated from the template, not when the page is presented to a user if caching or static site generation is involved.

`default`

Allows you to specify a fallback in case a value doesn't exist. default will show its value if the left side is nil, false, or empty.

In this example, product_price is not defined, so the default value is used.

  {{ product_price | default: 2.99 }} => 2.99

In this example, product_price is defined, so the default value is not used.

  {% assign product_price = 4.99 %}
  {{ product_price | default: 2.99 }} => 4.99

In this example, product_price is empty, so the default value is used.

  {% assign product_price = "" %}
  {{ product_price | default: 2.99 }} => 2.99

`divided_by`

Divides a number by another number.

The result is rounded down to the nearest integer (that is, the floor) if the divisor is an integer.

  {{ 16 | divided_by: 4 }} => 4


  {{ 5 | divided_by: 3 }} = 1

Controlling rounding

divided_by produces a result of the same type as the divisor -- that is, if you divide by an integer, the result will be an integer. If you divide by a float (a number with a decimal in it), the result will be a float.

For example, here the divisor is an integer:

  {{ 20 | divided_by: 7 }} => 2

Here it is a float:

  {{ 20 | divided_by: 7.0 }} => 2.85714285714286

Note that floats will not match thanks to how perl and ruby handle floating point numbers.

`downcase`

Makes each character in a string lowercase. It has no effect on strings which are already all lowercase.

  {{ "Parker Moore" | downcase }} => parker moore

  {{ "apple" | downcase }} => apple

`escape`

Escapes a string by replacing characters with escape sequences (so that the string can be used in a URL, for example). It doesn't change strings that don't have anything to escape.

  {{ "Have you read 'James & the Giant Peach'?" | escape }}
    => Have you read &#39;James &amp; the Giant Peach&#39;?

  {{ "Tetsuro Takara" | escape }} => Tetsuro Takara

`escape_once`

Escapes a string without changing existing escaped entities. It doesn't change strings that don't have anything to escape.

  {{ "1 < 2 & 3" | escape_once }} => 1 &lt; 2 &amp; 3

  {{ "1 &lt; 2 &amp; 3" | escape_once }} => 1 &lt; 2 &amp; 3

`first`

Returns the first item of an array.

  {{ "Ground control to Major Tom." | split: " " | first }} => Ground


  {% assign my_array = "zebra, octopus, giraffe, tiger" | split: ", " %}

  {{ my_array.first }}
    => zebra

You can use first with dot notation when you need to use the filter inside a tag:

  {% if my_array.first == "zebra" %}
    Here comes a zebra!
  {% endif %}
    => Here comes a zebra!

`floor`

Rounds an integer down to the nearest integer.

  {{ 1.2 | floor }} => 1
  {{ 2.0 | floor }} => 2
  {{ 183.357 | floor }} => 183

Here the input value is a string:

  {{ "3.5" | floor }} => 3

`join`

Combines the items in an array into a single string using the argument as a separator.

  {% assign beatles = "John, Paul, George, Ringo" | split: ", " %}
  {{ beatles | join: " and " }} => John and Paul and George and Ringo

`last`

Returns the last item of an array.

  {{ "Ground control to Major Tom." | split: " " | last }} => Tom.

  {% assign my_array = "zebra, octopus, giraffe, tiger" | split: ", " %}
  {{ my_array.last }} => tiger

You can use last with dot notation when you need to use the filter inside a tag:

 {% assign my_array = "zebra, octopus, giraffe, tiger" | split: ", " %}
 {% if my_array.last == "tiger" %}
    There goes a tiger!
  {% endif %}

`lstrip`

Removes all whitespace (tabs, spaces, and newlines) from the left side of a string. It does not affect spaces between words.

  {{ "          So much room for activities!          " | lstrip }}
    => So much room for activities!

`map`

Creates an array of values by extracting the values of a named property from another object.

In this example, assume the object site.pages contains all the metadata for a website. Using assign with the map filter creates a variable that contains only the values of the category properties of everything in the site.pages object.

    {% assign all_categories = site.pages | map: "category" %}

    {% for item in all_categories %}
    - {{ item }}
    {% endfor %}

The output of this template would look like this:

    - business
    - celebrities
    - lifestyle
    - sports
    - technology

`minus`

Subtracts a number from another number.

  {{ 4 | minus: 2 }} => 2

  {{ 16 | minus: 4 }} => 12

  {{ 183.357 | minus: 12 }} => 171.357

`modulo`

Returns the remainder of a division operation.

  {{ 3 | modulo: 2 }} => 1

  {{ 24 | modulo: 7 }} => 3

  {{ 183.357 | modulo: 12 }} => 3.357

`newline_to_br`

Replaces each newline (\n) with html break (<br />\n).

  {% capture string_with_newlines %}
  Hello
  there
  {% endcapture %}

  {{ string_with_newlines | newline_to_br }}

...becomes...

  <br />
  Hello<br />
  there<br />

`plus`

Adds a number to another number.

  {{ 154    | plus:1183 }}  => 1337
  {{ 4 | plus: 2 }} => 6
  {{ 16 | plus: 4 }} => 20
  {{ 183.357 | plus: 12 }} => 195.357

  {{ 'What' | plus:'Uhu' }} => WhatUhu

MATHFAIL!

Please note that integer behavior differs with Perl vs. Ruby so...

  {{ '1' | plus: '1' }}

...becomes 11 in Ruby but 2 in Perl.

`prepend`

Adds the specified string to the beginning of another string.

  {{ 'bar' | prepend:'foo' }} => 'foobar'

  {{ "apples, oranges, and bananas" | prepend: "Some fruit: " }}
    => Some fruit: apples, oranges, and bananas

  {% assign url = "example.com" %}
  {{ "/index.html" | prepend: url }} => example.com/index.html

`remove`

Removes every occurrence of the specified substring from a string.

  {{ 'foobarfoobar' | remove:'foo' }} => 'barbar'

  {{ "I strained to see the train through the rain" | remove: "rain" }}
    => I sted to see the t through the

`remove_first`

Remove the first occurrence of a string.

  {{ 'barbar' | remove_first:'bar' }} => bar

  {{ "I strained to see the train through the rain" | remove_first: "rain" }}
    => I sted to see the train through the rain

`replace`

Replaces every occurrence of the first argument in a string with the second argument.

The replacement value is optional and defaults to an empty string ('').

  {{ 'foofoo'                 | replace:'foo','bar' }} => barbar
  {% assign this = 'that' %}
  {{ 'Replace that with this' | replace:this,'this' }} => Replace this with this
  {{ 'I have a listhp.'       | replace:'th' }}        => I have a lisp.
  {{ "Take my protein pills and put my helmet on" | replace: "my", "your" }}
    => Take your protein pills and put your helmet on

`replace_first`

Replaces only the first occurrence of the first argument in a string with the second argument.

The replacement value is optional and defaults to an empty string ('').

  {{ 'barbar' | replace_first:'bar','foo' }} => 'foobar'

  {{ "Take my protein pills and put my helmet on" | replace_first: "my", "your" }}
    => Take your protein pills and put my helmet on

`reverse`

Reverses the order of the items in an array. reverse cannot reverse a string.

  {% assign my_array = "apples, oranges, peaches, plums" | split: ", " %}
  {{ my_array | reverse | join: ", " }} => plums, peaches, oranges, apples

Although reverse cannot be used directly on a string, you can split a string into an array, reverse the array, and rejoin it by chaining together filters:

  {{ "Ground control to Major Tom." | split: "" | reverse | join: "" }}
    => .moT rojaM ot lortnoc dnuorG

`round`

Rounds a number to the nearest integer or, if a number is passed as an argument, to that number of decimal places.

    {{ 4.6 | round }}        => 5
    {{ 4.3 | round }}        => 4
        {{ 1.2 | round }}        => 1
    {{ 2.7 | round }}        => 3
    {{ 4.5612 | round: 2 }}  => 4.56
        {{ 183.357 | round: 2 }} => 183.36

`rstrip`

Removes all whitespace (tabs, spaces, and newlines) from the right side of a string. It does not affect spaces between words.

  {{ "          So much room for activities!          " | rstrip }}
    =>          So much room for activities!

`size`

Returns the number of characters in a string, the number of items in an array, or the number of keys in a hash reference. Undefined values return 0.

  # Where array is [1..6] and hash is { child => 'blarg'}
  {{ array     | size }} => 6
  {{ 'Testing' | size }} => 7
  {{ hash      | size }} => 1
  {{ undefined | size }} => 0
  {{ "Ground control to Major Tom." | size }} => 28

  {% assign my_array = "apples, oranges, peaches, plums" | split: ", " %}
  {{ my_array.size }} => 4

You can use size with dot notation when you need to use the filter inside a tag:

  {% if site.pages.size > 10 %}
    This is a big website!
  {% endif %}

`slice`

Returns a substring of 1 character beginning at the index specified by the first argument. An optional second argument specifies the length of the substring to be returned.

String indices are numbered starting from 0.

  {{ "Liquid" | slice: 0 }} => L
  {{ "Liquid" | slice: 2 }} => q
  {{ "Liquid" | slice: 2, 5 }} => quid

If the first argument is a negative number, the indices are counted from the end of the string:

  {{ "Liquid" | slice: -3, 2 }} => ui

`sort`

Sorts items in an array in case-sensitive order.

  {% assign my_array = "zebra, octopus, giraffe, Sally Snake" | split: ", " %}
  {{ my_array | sort | join: ", " }} => Sally Snake, giraffe, octopus, zebra

An optional argument specifies which property of the array's items to use for sorting.

  {% assign products_by_price = collection.products | sort: "price" %}
  {% for product in products_by_price %}
    <h4>{{ product.title }}</h4>
  {% endfor %}

`sort_natural`

Sorts items in an array in case-sensitive order.

  {% assign my_array = "zebra, octopus, giraffe, Sally Snake" | split: ", " %}
  {{ my_array | sort_natural | join: ", " }}  => giraffe, octopus, Sally Snake, zebra

An optional argument specifies which property of the array's items to use for sorting.

  {% assign products_by_company = collection.products | sort_natural: "company" %}
  {% for product in products_by_company %}
    <h4>{{ product.title }}</h4>
  {% endfor %}

`split`

Divides a string into an array using the argument as a separator. split is commonly used to convert comma-separated items from a string to an array.

  {% assign beatles = "John, Paul, George, Ringo" | split: ", " %}
  {% for member in beatles %}
    {{ member }}
  {% endfor %}

...becomes...

  John
  Paul
  George
  Ringo

`strip`

Removes all whitespace (tabs, spaces, and newlines) from both the left and right sides of a string. It does not affect spaces between words.

  |{{ "          So much room for activities!          " | strip }}|
    => |So much room for activities!|

`strip_html`

Removes any HTML tags from a string.

  {{ '<div>Hello, <em id="whom">world!</em></div>' | strip_html }}  => Hello, world!
  '{{ '<IMG SRC = "foo.gif" ALT = "A > B">'        | strip_html }}' => ' B">'
  '{{ '<!-- <A comment> -->'                       | strip_html }}' => ' -->'
  {{ "Have <em>you</em> read <strong>Ulysses</strong>?" | strip_html }} => Have you read Ulysses?

Note that this filter uses s[<.*?][]g> in emmulation of the Ruby Liquid library's strip_html function. ...so don't email me if you (correcly) think this is a braindead way of stripping html.

`strip_newlines`

Removes any newline characters (line breaks) from a string.

{% capture string_with_newlines %} Hello there {% endcapture %}

{{ string_with_newlines | strip_newlines }} => Hellothere

`times`

Simple multiplication or string repetion.

  {{ 'foo' | times: 4 }} => foofoofoofoo
  {{ 5 | times: 4 }} => 20
  {{ 3 | times: 2 }} => 6
  {{ 24 | times: 7 }} => 168
  {{ 183.357 | times: 12 }} => 2200.284

`truncate`

Shortens a string down to the number of characters passed as an argument. If the specified number of characters is less than the length of the string, an ellipsis (...) is appended to the string and is included in the character count.

  {{ "Ground control to Major Tom." | truncate: 20 }} => Ground control to...
  {{ 'Running the halls!!!' | truncate:19 }}          => Running the hall..
  {% assign blarg = 'STOP!' %}
  {{ 'Any Colour You Like' | truncate:10,blarg }}     => Any CSTOP!
  {{ 'Why are you running away?' | truncate:4,'?' }}  => Why?
  {{ 'Ha' | truncate:4 }}                             => Ha
  {{ 'Ha' | truncate:1,'Laugh' }}                     => Laugh
  {{ 'Ha' | truncate:1,'...' }}                       => ...

...and...

    {{ 'This is a long line of text to test the default values for truncate' | truncate }}

...becomes...

    This is a long line of text to test the default...

Custom ellipsis

truncate takes an optional second argument that specifies the sequence of characters to be appended to the truncated string. By default this is an ellipsis (...), but you can specify a different sequence.

The length of the second argument counts against the number of characters specified by the first argument. For example, if you want to truncate a string to exactly 10 characters, and use a 3-character ellipsis, use 13 for the first argument of truncate, since the ellipsis counts as 3 characters.

  {{ "Ground control to Major Tom." | truncate: 25, ", and so on" }}
    => Ground control, and so on

No ellipsis

You can truncate to the exact number of characters specified by the first argument and avoid showing trailing characters by passing a blank string as the second argument:

  {{ "Ground control to Major Tom." | truncate: 20, "" }}
    => Ground control to Ma

`truncatewords`

Shortens a string down to the number of words passed as an argument. If the specified number of words is less than the number of words in the string, an ellipsis (...) is appended to the string.

  {{ "Ground control to Major Tom." | truncatewords: 3 }} => Ground control to...

Custom ellipsis

truncatewords takes an optional second argument that specifies the sequence of characters to be appended to the truncated string. By default this is an ellipsis (...), but you can specify a different sequence.

  {{ "Ground control to Major Tom." | truncatewords: 3, "--" }} => Ground control to--

No ellipsis

You can avoid showing trailing characters by passing a blank string as the second argument:

  {{ "Ground control to Major Tom." | truncatewords: 3, "" }} => Ground control to

`uniq`

Removes any duplicate elements in an array.

  {% assign my_array = "ants, bugs, bees, bugs, ants" | split: ", " %}
  {{ my_array | uniq | join: ", " }} => ants, bugs, bees

`upcase`

Makes each character in a string uppercase. It has no effect on strings which are already all uppercase.

  {{ "Parker Moore" | upcase }} => PARKER MOORE

  {{ "APPLE" | upcase }} => APPLE

`url_decode`

Decodes a string that has been encoded as a URL or by url_encode.

  {{ "%27Stop%21%27+said+Fred" | url_decode }} => 'Stop!' said Fred

`url_encode`

Converts any URL-unsafe characters in a string into percent-encoded characters.

  {{ "john@liquid.com" | url_encode }} => john%40liquid.com

  {{ "Tetsuro Takara" | url_encode }} => Tetsuro+Takara

  {{ "'Stop!'" said Fred" | url_encode }} => %27Stop%21%27+said+Fred

`where`

Creates an array including only the objects with a given property value, or any truthy value by default.

In this example, assume you have a list of products and you want to show your kitchen products separately. Using where, you can create an array containing only the products that have a "type" of "kitchen".

  All products:
  {% for product in products %}
  - {{ product.title }}
  {% endfor %}

  {% assign kitchen_products = products | where: "type", "kitchen" %}

  Kitchen products:
  {% for product in kitchen_products %}
  - {{ product.title }}
  {% endfor %}

...rendered with this data...

  products => [
        { title => 'Vacuum',       type => 'carpet', },
        { title => 'Spatula',      type => 'kitchen' },
        { title => 'Television',   type => 'den' },
        { title => 'Garlic press', type => 'kitchen' },
    ]

...becomes...

  All products:
  - Vacuum
  - Spatula
  - Television
  - Garlic press

  Kitchen products:
  - Spatula
  - Garlic press

Say instead you have a list of products and you only want to show those that are available to buy. You can where with a property name but no target value to include all products with a truthy "available" value.

  All products:
  {% for product in products %}
  - {{ product.title }}
  {% endfor %}

  {% assign available_products = products | where: "available" %}

  Available products:
  {% for product in available_products %}
  - {{ product.title }}
  {% endfor %}

...rendered with this data...

  products => [
        { title => 'Coffee mug',               available => 1},
        { title => 'Limited edition sneakers', available => 0},
        { title => 'Boring sneakers',          available => 1}
    ]

...becomes...

  All products:
  - Coffee mug
  - Limited edition sneakers
  - Boring sneakers

  Available products:
  - Coffee mug
  - Boring sneakers

The where filter can also be used to find a single object in an array when combined with the first filter. For example, say you want to show off the shirt in your new fall collection.

  {% assign new_shirt = products | where: "type", "shirt" | first %}

  Featured product: {{ new_shirt.title }}

...rendered with the following data...

  products => [
            { title => 'Limited edition sneakers',    type => 'shoes' },
            { title => 'Hawaiian print sweater vest', type => 'shirt' },
            { title => 'Tuxedo print tshirt',         type => 'shirt' },
            { title => 'Jorts',                       type => 'shorts' }
        ]

...becomes...

  Featured product: Hawaiian print sweater vest

`money`

Formats floats and integers as if they were money.

    {{  4.6    | money }} => $4.60
    {{ -4.3    | money }} => -$4.30
    {{  4.5612 | money }} => $4.56

You may pass a currency symbol to override the default dollar sign ($).

    {{  4.6    | money:'€' }} => €4.60

`stock_price`

Formats floats and integers as if they were stock prices.

    {{ 4.6    | stock_price }} => $4.60
    {{ 0.30   | stock_price }} => $0.3000
    {{ 4.5612 | stock_price }} => $4.56

You may pass a currency symbol to override the default dollar sign ($).

    {{  4.6    | stock_price:'€' }} => €4.60

Author

Sanko Robinson <sanko@cpan.org> - http://sankorobinson.com/

CPAN ID: SANKO

License and Legal

This program is free software; you can redistribute it and/or modify it under the terms of The Artistic License 2.0. See the LICENSE file included with this distribution or notes on the Artistic License 2.0 for clarification.

When separated from the distribution, all original POD documentation is covered by the Creative Commons Attribution-Share Alike 3.0 License. See the clarification of the CCA-SA3.0.

To install Template::Liquid, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Template::Liquid

CPAN shell

perl -MCPAN -e shell
install Template::Liquid

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

Synopsis

Standard Filters

abs

append

at_least

at_most

capitalize

ceil

compact

concat

date

default

divided_by

Controlling rounding

downcase

escape

escape_once

first

floor

join

last

lstrip

map

minus

modulo

newline_to_br

plus

MATHFAIL!

prepend

remove

remove_first

replace

replace_first

reverse

round

rstrip

size

slice

sort

sort_natural

split

strip

strip_html

strip_newlines

times

truncate

Custom ellipsis

No ellipsis

truncatewords

Custom ellipsis

No ellipsis

uniq

upcase

url_decode

url_encode

where

money

stock_price

Author

License and Legal

Module Install Instructions

`abs`

`append`

`at_least`

`at_most`

`capitalize`

`ceil`

`compact`

`concat`

`date`

`default`

`divided_by`

`downcase`

`escape`

`escape_once`

`first`

`floor`

`join`

`last`

`lstrip`

`map`

`minus`

`modulo`

`newline_to_br`

`plus`

`prepend`

`remove`

`remove_first`

`replace`

`replace_first`

`reverse`

`round`

`rstrip`

`size`

`slice`

`sort`

`sort_natural`

`split`

`strip`

`strip_html`

`strip_newlines`

`times`

`truncate`

`truncatewords`

`uniq`

`upcase`

`url_decode`

`url_encode`

`where`

`money`

`stock_price`