54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
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import {ATTRIBUTE, VALUE} from './expression-types'
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import {dashToCamelCase} from './strings'
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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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* @returns { undefined } hoppla.. at this point the program should stop working
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*/
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export function panic(message) {
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throw new Error(message)
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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) ? cache.get(val) : 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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* Evaluate a list of attribute expressions
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* @param {Array} attributes - attribute expressions generated by the riot compiler
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* @returns {Object} key value pairs with the result of the computation
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*/
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export function evaluateAttributeExpressions(attributes) {
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return attributes.reduce((acc, attribute) => {
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const {value, type} = attribute
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switch (true) {
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// spread attribute
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case !attribute.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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// value attribute
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case type === VALUE:
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acc.value = attribute.value
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break
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// normal attributes
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default:
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acc[dashToCamelCase(attribute.name)] = attribute.value
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}
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return acc
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}, {})
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}
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