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node_modules/@riotjs/util/misc.js

@@ -0,0 +1,54 @@
+import {ATTRIBUTE, VALUE} from './expression-types'
+import {dashToCamelCase} from './strings'
+
+/**
+ * Throw an error with a descriptive message
+ * @param   { string } message - error message
+ * @returns { undefined } hoppla.. at this point the program should stop working
+ */
+export function panic(message) {
+  throw new Error(message)
+}
+/**
+ * Returns the memoized (cached) function.
+ * // borrowed from https://www.30secondsofcode.org/js/s/memoize
+ * @param {Function} fn - function to memoize
+ * @returns {Function} memoize function
+ */
+export function memoize(fn) {
+  const cache = new Map()
+  const cached = val => {
+    return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val)
+  }
+  cached.cache = cache
+  return cached
+}
+
+/**
+ * Evaluate a list of attribute expressions
+ * @param   {Array} attributes - attribute expressions generated by the riot compiler
+ * @returns {Object} key value pairs with the result of the computation
+ */
+export function evaluateAttributeExpressions(attributes) {
+  return attributes.reduce((acc, attribute) => {
+    const {value, type} = attribute
+
+    switch (true) {
+    // spread attribute
+    case !attribute.name && type === ATTRIBUTE:
+      return {
+        ...acc,
+        ...value
+      }
+    // value attribute
+    case type === VALUE:
+      acc.value = attribute.value
+      break
+    // normal attributes
+    default:
+      acc[dashToCamelCase(attribute.name)] = attribute.value
+    }
+
+    return acc
+  }, {})
+}