camille
63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
import { ATTRIBUTE, VALUE, REF } from './expression-types.js'
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import { dashToCamelCase } from './strings.js'
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/**
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* Throw an error with a descriptive message
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* @param { string } message - error message
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* @param { string } cause - optional error cause object
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* @returns { undefined } hoppla... at this point the program should stop working
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*/
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export function panic(message, cause) {
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throw new Error(message, { cause })
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}
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/**
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* Returns the memoized (cached) function.
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* // borrowed from https://www.30secondsofcode.org/js/s/memoize
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* @param {Function} fn - function to memoize
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* @returns {Function} memoize function
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*/
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export function memoize(fn) {
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const cache = new Map()
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const cached = (val) => {
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return cache.has(val)
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? cache.get(val)
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: cache.set(val, fn.call(this, val)) && cache.get(val)
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}
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cached.cache = cache
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return cached
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}
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/**
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* Generate key-value pairs from a list of attributes
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* @param {Array} attributes - list of attributes generated by the riot compiler, each containing type, name, and evaluate function
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* @param {object} scope - the scope in which the attribute values will be evaluated
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* @returns {object} An object containing key-value pairs representing the computed attribute values
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*/
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export function generatePropsFromAttributes(attributes, scope) {
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return attributes.reduce((acc, { type, name, evaluate }) => {
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const value = evaluate(scope)
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switch (true) {
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// spread attribute
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case !name && type === ATTRIBUTE:
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return {
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...acc,
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...value,
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}
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// ref attribute
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case type === REF:
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acc.ref = value
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break
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// value attribute
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case type === VALUE:
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acc.value = value
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break
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// normal attributes
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default:
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acc[dashToCamelCase(name)] = value
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}
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return acc
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}, {})
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}
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