urbit-ob

commit 2a60d7f9b51e805454065c95aa34094ed5359e29
parent f3ce19a94bfd03afd372d271d24bf28bbbb8f5cf
Author: Jared Tobin <jared@jtobin.io>
Date:   Fri,  5 Oct 2018 13:25:23 +1300

Add @q encoding.

See urbit/arvo#824.

Diffstat:
M
src/index.js
 | 
23
++++++++++++++++++++++-
M
test/core.test.js
 | 
24
++++++++++++++++++++++++

2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/src/index.js b/src/index.js
@@ -3,7 +3,8 @@
  */
 
 const bnjs = require('bn.js')
-const { reduce, isUndefined, isString, every, map } = require('lodash')
+const { reduce, concat, chunk, isUndefined,
+        isString, every, map } = require('lodash')
 
 const raku = [
   3077398253,
@@ -356,6 +357,25 @@ const patp = (n) => {
     : loop(sxz, zero, ''))
 }
 
+// bignum patq
+const patq = (n) => {
+  const buff = n.toArrayLike(Buffer)
+
+  const chunked =
+    buff.length % 2 === 1 && buff.length !== 1
+    ? concat([[buff[0]]], chunk(buff.slice(1), 2))
+    : chunk(buff, 2)
+
+  const name = byts =>
+    isUndefined(byts[1])
+    ? getSuffix(byts[0])
+    : getPrefix(byts[0]) + getSuffix(byts[1])
+
+  return chunked.reduce((acc, elem) =>
+    acc + (acc === '~' ? '' : '-') + name(elem), '~')
+}
+
+
 // returns the class of a ship from it's name
 const tierOfpatp = name => {
   const l = len(patp2arr(name))
@@ -500,6 +520,7 @@ module.exports = {
   isValidName: isValidName,
 
   patp: patp,
+  patq: patq,
 
   _add2patp: _add2patp,
   _getsuffix: getSuffix,
diff --git a/test/core.test.js b/test/core.test.js
@@ -130,3 +130,27 @@ test('correctly encodes a big hex string as @p', () => {
   let expected = '~divmes-davset-holdet--sallun-salpel-taswet-holtex--watmeb-tarlun-picdet-magmes--holter-dacruc-timdet-divtud--holwet-maldut-padpel-sivtud';
   expect(ob.patp(input)).toBe(expected);
 });
+
+test('correctly encode 0 as @q', () => {
+  let input = new bnjs('0');
+  let expected = '~zod';
+  expect(ob.patq(input)).toBe(expected);
+});
+
+test('correctly encode 0x102 as @q', () => {
+  let input = new bnjs('0102', 'hex');
+  let expected = '~marbud';
+  expect(ob.patq(input)).toBe(expected);
+});
+
+test('correctly encode 0x10102 as @q', () => {
+  let input = new bnjs('010102', 'hex');
+  let expected = '~nec-marbud';
+  expect(ob.patq(input)).toBe(expected);
+});
+
+test('correctly encode 0x1010101010101010102 as @q', () => {
+  let input = new bnjs('01010101010101010102', 'hex');
+  let expected = '~marnec-marnec-marnec-marnec-marbud';
+  expect(ob.patq(input)).toBe(expected);
+});