Shrink holiday JSON by using numerical 1-5 for Genesis-Deuteronomy

src/festival.js

@@ -0,0 +1,39 @@
+import festivals from './holiday-readings.json';
+import {BOOK, clone} from './common';
+
+/**
+ * @private
+ * @param {string} key
+ * @return {boolean}
+ */
+export function hasFestival(key) {
+  return typeof festivals[key] === 'object';
+}
+
+/**
+ * @private
+ * @param {string} key
+ * @return {any}
+ */
+export function lookupFestival(key) {
+  let src = festivals[key];
+  if (typeof src === 'undefined') {
+    return undefined;
+  }
+  if (src.alias) {
+    const tmp = festivals[src.key];
+    if (typeof tmp === 'undefined') {
+      throw new Error(`Leying key ${key} => ${src.key} not found`);
+    }
+    src = tmp;
+  }
+  const result = src.fullkriyah ? clone(src) : src;
+  if (result.fullkriyah) {
+    Object.values(result.fullkriyah).forEach((aliyah) => {
+      if (typeof aliyah.k === 'number') {
+        aliyah.k = BOOK[aliyah.k];
+      }
+    });
+  }
+  return result;
+}