# Templates ## Helpers Yomichan supports several custom Handlebars helpers for rendering templates. The source code for these templates can be found [here](../ext/bg/js/template-renderer.js). ### `dumpObject` Converts an object to a pretty-printed JSON string. This function can be helpful for debugging values when creating templates.
Syntax: {{#dumpObject}}<object>{{/dumpObject}} * _`object`_
The object to convert.
Example: ```handlebars 
{{#dumpObject}}{{.}}{{/dumpObject}}
``` Output: ```html 
{
      "key": "value"
  }
``` Preview: ```html { "key": "value" } ```
### `furigana` Converts a definition to its furigana representation.
Syntax: {{#furigana}}<definition>{{/furigana}} * _`definition`_
The definition to convert.
Example: ```handlebars {{#furigana}}{{.}}{{/furigana}} ``` Output: ```html 読よむ ``` Preview 
読よむ
### `furiganaPlain` Converts a definition to its simplified furigana representation.
Syntax: {{#furiganaPlain}}<definition>{{/furigana}} * _`definition`_
The definition to convert.
Example: ```handlebars {{~#furiganaPlain~}}{{.}}{{~/furiganaPlain~}} ``` Output: ```html 読[よ]む ```
### `multiLine` Replaces newline characters with a forced HTML line break `
`.
Syntax: {{#multiLine}}text with multiple lines{{/multiLine}}
Example: ```handlebars {{#kanjiLinks~}} some multiline text {{~/kanjiLinks}} ``` Output: ```html some
multiline
text ``` Preview: 
some
multiline
text
### `regexReplace` Uses a [regular expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions) to replace a pattern with the specified text.
Syntax: {{#regexReplace regex replacement [flags]}}text-to-modify{{/regexReplace}} * _`regex`_
The raw string used to create the regular expression. This value is passed to the [`RegExp`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp) constructor. * _`replacement`_
The text used to replace pattern matches. This supports the standard [special capture group replacements](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#Specifying_a_string_as_a_parameter) as supported by the web browser. * _`flags`_ _(optional)_
Optional flags to pass to the [`RegExp`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp) constructor. * _`text-to-modify`_
The text that the regular expression is applied to.
Example: ```handlebars {{#regexReplace "\(([^)]*)\)" "$1" "g"~}}Here is (some) (text) (in) (parentheses){{~/regexReplace}} ``` Output: ```html Here is some text in parentheses ```
### `regexMatch` Uses a [regular expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions) to return only the content that matches the pattern.
Syntax: {{#regexMatch regex [flags]}}text-to-modify{{/regexMatch}} * _`regex`_
The raw string used to create the regular expression. This value is passed to the [`RegExp`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp) constructor. * _`flags`_ _(optional)_
Optional flags to pass to the [`RegExp`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp) constructor. * _`text-to-modify`_
The text that the regular expression is applied to.
Example: ```handlebars {{#regexMatch "\(([^)]*)\)" "g"~}}Here is (some) (text) (in) (parentheses){{~/regexMatch}} ``` Output: ```html (some)(text)(in)(parentheses) ```
### `mergeTags` Creates a set of all unique tags for the definition and returns a text representation of the tags separated by commas.
Syntax: {{#mergeTags definition isGroupMode isMergeMode}}{{/mergeTags}} * _`definition`_
The root definition object. * _`isGroupMode`_ _(optional)_
Whether or not the display mode is the 'group' mode. * _`isMergeMode`_
Whether or not the display mode is the 'merge' mode.
Example: ```handlebars {{~#mergeTags definition group merge}}{{/mergeTags~}} ``` Output: ```html v5m, vt, JMdict (English) ```
### `eachUpTo` Similar to the built-in `each` function, but iterates up to a maximum count. If the iterable is falsy or empty, the `else` condition will be used.
Syntax: {{#eachUpTo iterable maxCount}}(modification){{else}}(else-modification){{/eachUpTo}} * _`iterable`_
The object that should be looped over. A JavaScript [`for...of`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of) loop is used, so the object only needs to be iterable. * _`maxCount`_ _(optional)_
The maximum number of entries to loop over. * _`modification`_
The template used to modify the value. The context is changed to the current item of iteration. * _`else-modification`_
The template used in case the iterable is falsy or empty. The context is unchanged.
Example: ```handlebars {{~#eachUpTo someArray 5}}{{{.}}}
{{else}}Empty{{/mergeTags~}} ``` Output: ```html someArray[0]
someArray[1]
someArray[2]
someArray[3]
someArray[4]
``` Preview: 
someArray[0]
someArray[1]
someArray[2]
someArray[3]
someArray[4]
### `spread` Uses the JavaScript [spread](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax) operator to convert one or more iterables into a single array. This allows it to be used similar to an [`Array.concat`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat) operation.
Syntax: {{#spread iterable1 iterable2 ... iterableN}}{{/spread}} * _`iterableN`_
A variable amount of iterable objects to combine into a single array.
Example: ```handlebars {{#each (spread array1 array2)}}{{{.}}}
{{/each}} ``` Output: ```html array1[0]
array1[1]
array2[0]
array2[1]
``` Preview: 
array1[0]
array1[1]
array2[0]
array2[1]
### `op` Performs a simple operation on one, two, or three arguments. The operations available are: * Unary operators: `+`, `-`, `~`, `!` * Binary operators: `+`, `-`, `/`, `*`, `%`, `**`, `==`, `!=`, `===`, `!==`, `<`, `<=`, `>`, `>=`, `<<`, `>>`, `>>>`, `&`, `|`, `^`, `&&`, `||` * Ternary operators: `?:` If an unknown operator is specified, the `undefined` value is returned.
Syntax: {{#op operator operand1 [operand2] [operand3]}}{{/op}} * _`operator`_
One of the unary, binary, or ternary operators. * _`operand1`_
The first operand of the operation. * _`operand2`_ _(Optional)_
The second operand of the operation. * _`operand3`_ _(Optional)_
The third operand of the operation.
Example: ```handlebars {{#if (op "===" value1 value2)}}Values are equal{{/op~}}
{{~#op "-" value1}}{{/op~}}
{{~#op "?:" value1 "a" "b"}}{{/op}} ``` Output: ```html Values are equal
-32
a ``` Preview: 
Values are equal
-32
a
### `get` Gets a value from the custom state stack.
Syntax: {{#get name}}{{/get}} * _`name`_
The name of the variable to get.
Example: ```handlebars {{#get "some-text"}}{{/get}} ``` Output: ```html This is the value of some-text! ```
### `set` Assigns a value to the custom state stack.
Syntax: {{#set name}}value{{/get}}
{{#set name value}}{{/get}}
* _`name`_
The name of the variable to assign. * _`value`_
The value of the variable.
Example: ```handlebars {{#set "some-text"}}This is the value of some-text!{{/set~}} {{~#set "some-number" 32}}{{/set}} ``` Output: ```html ```
### `scope` Pushes a new variable scope to the custom state stack. Variable assignments are applied to the most recent scope, and variable lookups will start from the most recent scope and work backwards until a value is found.
Syntax: {{#scope}}content{{/scope}} * _`name`_
The name of the variable to assign. * _`value`_
The value of the variable.
Example: ```handlebars {{~#set "key" 32}}{{/set~}} {{~#get "key"}}{{/get~}}, {{~#scope~}} {{~#get "key"}}{{/get~}}, {{~#set "key" 64}}{{/set~}} {{~#get "key"}}{{/get~}}, {{~/scope~}} {{~#get "key"}}{{/get~}} ``` Output: ```html 32,32,64,32 ```
### `property` Repeatedly gets a property of an object.
Syntax: {{#property object property1 property2 ... propertyN}}{{/property}} * _`object`_
The initial object to use. * _`propertyN`_
A chain of property names to get on the object.
Example: ```handlebars {{property someObject "field" 0 "toString"}} ``` Output: ```html function toString() { [native code] } ```
### `noop` No-op. Returns the inner contents of the template.
Syntax: {{#noop}}content{{/noop}}
Example: ```handlebars {{noop}}Unchanged content{{/noop}} ``` Output: ```html Unchanged content ```
### `isMoraPitchHigh` Returns whether or not a mora will have a high pitch, given the index of the mora and the position of the downstep.
Syntax: {{#isMoraPitchHigh index position}}{{/isMoraPitchHigh}}
Example: ```handlebars {{#if (isMoraPitchHigh 1 2)}}High pitch{{else}}Low pitch{{/if}} ``` Output: ```html High pitch ```
### `getKanaMorae` Returns an array of the mora for a kana string.
Syntax: {{#getKanaMorae kana-string}}{{/getKanaMorae}}
Example: ```handlebars {{#each (getKanaMorae "よみちゃん")}}{{{.}}}
{{/each}} ``` Output: ```html よ
み
ちゃ
ん
``` Preview: 
よ
み
ちゃ
ん
## Legacy Helpers Yomichan has historically used Handlebars templates to generate the HTML used on the search page and results popup. To simplify the and improve Yomichan's capabilities, the HTML elements are now generated directly using a different process. As such, there are several leftover Handlebars helpers that do not have much utility for Anki templates, but are kept for compatibility purposes. ### `kanjiLinks` Replaces kanji characters in the text with linkified versions.
Syntax: {{#kanjiLinks}}text{{/kanjiLinks}}
Example: ```handlebars {{#kanjiLinks}}読む{{/kanjiLinks}} ``` Output: ```html 読む ``` Preview: 
読む
### `sanitizeCssClass` Sanitizes text so it can be used as a CSS class name.
Syntax: {{#sanitizeCssClass}}text{{/sanitizeCssClass}}
Example: ```handlebars {{#sanitizeCssClass}}some text with many types of characters !@#$%^ 読む{{/sanitizeCssClass}} ``` Output: ```html some_text_with_many_types_of_characters________読む ```