From 80c3d09308d4d168658ee7af34e026ff37e1e2ce Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Wed, 12 Jul 2017 22:54:43 -0400
Subject: Ignore whitespace

---
 __tests__/lexer.test.js | 14 ++++++++++++++
 src/lexer.js            |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/__tests__/lexer.test.js b/__tests__/lexer.test.js
index 20d461f..8d47ff5 100644
--- a/__tests__/lexer.test.js
+++ b/__tests__/lexer.test.js
@@ -9,6 +9,20 @@ describe('lex', () => {
     expect(lex('q')).toBe('error')
   })
 
+  describe('ignores whitespace', () => {
+    it('2 d 4', () => {
+      expect(lex('2 d 4')).not.toBe('error')
+    })
+
+    it('   1d8', () => {
+      expect(lex('   1d8')).not.toBe('error')
+    })
+
+    it('3d4   ', () => {
+      expect(lex('3d4   ')).not.toBe('error')
+    })
+  })
+
   describe('basic dice', () => {
     it('1d6', () => {
       expect(lex('1d6')).toEqual([
diff --git a/src/lexer.js b/src/lexer.js
index ff7b0d4..7d876fb 100644
--- a/src/lexer.js
+++ b/src/lexer.js
@@ -14,8 +14,13 @@ const newValueLexeme = (type, regex, converter = v => v) => {
   })
 }
 
+const newSkippableLexeme = (type, regex) => {
+  newLexemeType(type, regex, () => {})
+}
+
 newValueLexeme('number', '\\d+', Number)
 newLexemeType('d', 'd')
+newSkippableLexeme('whitespace', '\\s+')
 
 const lex = (expressionString) => {
   let lexemes = []
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