refactor: Still trying to reorganize edit mode to be more robust

node_modules/bidi-js/src/util/parseCharacterMap.js

@@ -0,0 +1,30 @@
+/**
+ * Parses an string that holds encoded codepoint mappings, e.g. for bracket pairs or
+ * mirroring characters, as encoded by scripts/generateBidiData.js. Returns an object
+ * holding the `map`, and optionally a `reverseMap` if `includeReverse:true`.
+ * @param {string} encodedString
+ * @param {boolean} includeReverse - true if you want reverseMap in the output
+ * @return {{map: Map<number, number>, reverseMap?: Map<number, number>}}
+ */
+export function parseCharacterMap (encodedString, includeReverse) {
+  const radix = 36
+  let lastCode = 0
+  const map = new Map()
+  const reverseMap = includeReverse && new Map()
+  let prevPair
+  encodedString.split(',').forEach(function visit(entry) {
+    if (entry.indexOf('+') !== -1) {
+      for (let i = +entry; i--;) {
+        visit(prevPair)
+      }
+    } else {
+      prevPair = entry
+      let [a, b] = entry.split('>')
+      a = String.fromCodePoint(lastCode += parseInt(a, radix))
+      b = String.fromCodePoint(lastCode += parseInt(b, radix))
+      map.set(a, b)
+      includeReverse && reverseMap.set(b, a)
+    }
+  })
+  return { map, reverseMap }
+}