Printer

MMO.core · 1 symbol · generated 5 Oct 2026

class

Printer

Printer: render any value to text.

class MMO.core.Printer

Namespace: MMO.core

Use Shared instance: Printer try every renderer corresponding to the given format (opts.format), or the given types (opts.type)

render something: MMO.core.Printer.Shared().render(value); add a new renderer: MMO.core.Printer.Shared().setRenderer('datetime', (value, opts) => ...);

MMO.core.Printer.Shared().render(false, {format: status, type: [null]}) This will cause the printer to try the following renderder: 'status', 'null', 'boolean' (from typeof value). If any renderer exists and returns a string or an Element, the printer will stop trying other renderer.

Index

	constructor()
	Shared(id) static	Get a shared printer, creating it (with the default renderers) on first use.
	setRenderer(format, fn, opts)	Register how a format is rendered, replacing any previous renderer of that name.
	getRenderer(format)
	callRenderer(type, value, opts)	Run one renderer, without the format/type resolution `MMO.core.Printer#render` does.
	getOptions(format)
	setOptions(format, opts)	Replace a registered renderer's options.
	render(value, opts)	Render a value, trying the renderers in order until one accepts it: `opts.format`, then each of `opts.type`, then `typeof value`.
	setDefaultRenderers()	renderHeader(headerProperties, key) { if (headerProperties.contentRoot instanceof MMO.core.Map) { headerProperties = headerProperties.contentRoot.toObject(); } const currentHeader = headerPropertie…

Methods9

constructor()

Printer.js:18

constructor()

Shared(id)

staticPrinter.js:27

Get a shared printer, creating it (with the default renderers) on first use.

static Shared(id = '*')

id = '*'	`string`	keep several independent printers side by side
returns	MMO.core.Printer

setRenderer(format, fn, opts)

Printer.js:43

setRenderer(format, fn, opts = [])

format	`string`	a format name, a json type, or a `typeof` result
fn	`Function`	function(value, opts): string\|Element\|Array\|null\|false return null or false to decline the value and let the next renderer try
opts = []	`Object`	options merged into every call's `opts`

getRenderer(format)

Printer.js:51

getRenderer(format)

format	`string`
returns	`?Function`	null when nothing is registered

callRenderer(type, value, opts)

Printer.js:62

Run one renderer, without the format/type resolution MMO.core.Printer#render does.

callRenderer(type, value, opts)

type	`string`	the renderer's name
value	`*`
opts	`Object`
returns	`string` \| `Element` \| `Array` \| `false`	false when the renderer is missing or declined

getOptions(format)

Printer.js:76

getOptions(format)

format	`string`
returns	`?Object`	null when nothing is registered under that name

setOptions(format, opts)

Printer.js:86

Replace a registered renderer's options.

setOptions(format, opts)

format	`string`
opts	`Object`
throws	`MMO.Error`	when nothing is registered under that name

render(value, opts)

Printer.js:98

Render a value, trying the renderers in order until one accepts it: opts.format, then each of opts.type, then typeof value.

render(value, opts = [])

value	`*`
opts = []	`Object`	`format`, `type`, `html` and whatever the renderer reads
returns	`string` \| `Element` \| `Array`	the value stringified when no renderer matched

setDefaultRenderers()

Printer.js:134

renderHeader(headerProperties, key) { if (headerProperties.contentRoot instanceof MMO.core.Map) { headerProperties = headerProperties.contentRoot.toObject(); } const currentHeader = headerProperties[key]; if (!currentHeader.headerFormat) { return currentHeader.title; } return this.callRenderer(currentHeader.headerFormat, currentHeader); }

setDefaultRenderers()