72 lines
2.8 KiB
JavaScript
72 lines
2.8 KiB
JavaScript
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import {panic} from '@riotjs/util/misc'
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import { transform } from './transformer'
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/**
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* Parsers that can be registered by users to preparse components fragments
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* @type { Object }
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*/
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export const preprocessors = Object.freeze({
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javascript: new Map(),
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css: new Map(),
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template: new Map().set('default', code => ({ code }))
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})
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// throw a processor type error
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function preprocessorTypeError(type) {
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panic(`No preprocessor of type "${type}" was found, please make sure to use one of these: 'javascript', 'css' or 'template'`)
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}
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// throw an error if the preprocessor was not registered
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function preprocessorNameNotFoundError(name) {
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panic(`No preprocessor named "${name}" was found, are you sure you have registered it?'`)
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}
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/**
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* Register a custom preprocessor
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* @param { string } type - preprocessor type either 'js', 'css' or 'template'
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* @param { string } name - unique preprocessor id
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* @param { Function } preprocessor - preprocessor function
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* @returns { Map } - the preprocessors map
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*/
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export function register(type, name, preprocessor) {
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if (!type) panic('Please define the type of preprocessor you want to register \'javascript\', \'css\' or \'template\'')
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if (!name) panic('Please define a name for your preprocessor')
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if (!preprocessor) panic('Please provide a preprocessor function')
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if (!preprocessors[type]) preprocessorTypeError(type)
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if (preprocessors[type].has(name)) panic(`The preprocessor ${name} was already registered before`)
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preprocessors[type].set(name, preprocessor)
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return preprocessors
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}
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/**
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* Register a custom preprocessor
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* @param { string } type - preprocessor type either 'js', 'css' or 'template'
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* @param { string } name - unique preprocessor id
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* @returns { Map } - the preprocessors map
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*/
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export function unregister(type, name) {
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if (!type) panic('Please define the type of preprocessor you want to unregister \'javascript\', \'css\' or \'template\'')
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if (!name) panic('Please define the name of the preprocessor you want to unregister')
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if (!preprocessors[type]) preprocessorTypeError(type)
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if (!preprocessors[type].has(name)) preprocessorNameNotFoundError(name)
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preprocessors[type].delete(name)
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return preprocessors
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}
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/**
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* Exec the compilation of a preprocessor
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* @param { string } type - preprocessor type either 'js', 'css' or 'template'
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* @param { string } name - unique preprocessor id
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* @param { Object } meta - preprocessor meta information
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* @param { string } source - source code
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* @returns { Output } object containing a sourcemap and a code string
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*/
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export function execute(type, name, meta, source) {
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if (!preprocessors[type]) preprocessorTypeError(type)
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if (!preprocessors[type].has(name)) preprocessorNameNotFoundError(name)
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return transform(preprocessors[type].get(name), meta, source)
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}
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