From 373785c729484ffd734a16f6188509f44d232a4a Mon Sep 17 00:00:00 2001
From: Nam Hoang Le <hoangnamb1.288@gmail.com>
Date: Wed, 1 Dec 2021 20:44:15 +0700
Subject: [PATCH] fix: Regexp error in empty column

---
 src/wrapWord.ts  | 4 ++--
 test/wrapWord.ts | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/wrapWord.ts b/src/wrapWord.ts
index e088e5c..fceeafe 100644
--- a/src/wrapWord.ts
+++ b/src/wrapWord.ts
@@ -7,7 +7,7 @@ const calculateStringLengths = (input: string, size: number): Array<[Length:numb
   const chunks: Array<[number, number]> = [];
 
   // https://regex101.com/r/gY5kZ1/1
-  const re = new RegExp('(^.{1,' + String(size) + '}(\\s+|$))|(^.{1,' + String(size - 1) + '}(\\\\|/|_|\\.|,|;|-))');
+  const re = new RegExp('(^.{1,' + String(Math.max(size, 1)) + '}(\\s+|$))|(^.{1,' + String(Math.max(2, size - 1) - 1) + '}(\\\\|/|_|\\.|,|;|-))');
 
   do {
     let chunk: string;
@@ -38,7 +38,7 @@ export const wrapWord = (input: string, size: number): string[] => {
   const result: string[] = [];
 
   let startIndex = 0;
-  calculateStringLengths(input, size).forEach(([length, offset]) => {
+  calculateStringLengths(input, Math.max(size, 1)).forEach(([length, offset]) => {
     result.push(slice(input, startIndex, startIndex + length));
 
     startIndex += length + offset;
diff --git a/test/wrapWord.ts b/test/wrapWord.ts
index ea875d4..af4828b 100644
--- a/test/wrapWord.ts
+++ b/test/wrapWord.ts
@@ -23,6 +23,14 @@ describe('wrapWord', () => {
       expect(wrapWord(stringToRed('aaaaa'), 2)).to.deep.equal(arrayToRed(['aa', 'aa', 'a']));
     });
   });
+  context('empty string', () => {
+    it('should return empty string as well', () => {
+      expect(wrapWord('', 0)).to.deep.equal(['']);
+      expect(wrapWord('', 1)).to.deep.equal(['']);
+      expect(wrapWord('', 2)).to.deep.equal(['']);
+      expect(wrapWord('', 3)).to.deep.equal(['']);
+    });
+  });
   context('a long word with a special character', () => {
     it('cuts the word at the special character', () => {
       expect(wrapWord('aaa\\bbb', 5)).to.deep.equal(['aaa\\', 'bbb']);