From 403f2ed88dbef7ce1bbb07a13bca4bc6e35cbcf3 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Tue, 22 Aug 2017 15:35:21 -0400
Subject: Lex and parse additive bonus

---
 __tests__/lexer.test.js  | 12 ++++++++++++
 __tests__/parser.test.js | 12 ++++++++++++
 index.js                 |  2 ++
 src/lexer.js             |  1 +
 src/parser.js            |  1 +
 5 files changed, 28 insertions(+)

diff --git a/__tests__/lexer.test.js b/__tests__/lexer.test.js
index 6900764..d7a4368 100644
--- a/__tests__/lexer.test.js
+++ b/__tests__/lexer.test.js
@@ -161,4 +161,16 @@ describe('lex', () => {
       ])
     })
   })
+
+  describe('bonusAdd', () => {
+    test('3d4+1', () => {
+      expect(lex('3d4+1')).toEqual([
+        { type: 'constant', value: 3 },
+        { type: 'd' },
+        { type: 'constant', value: 4 },
+        { type: 'plus' },
+        { type: 'constant', value: 1 }
+      ])
+    })
+  })
 })
diff --git a/__tests__/parser.test.js b/__tests__/parser.test.js
index bc88894..350af03 100644
--- a/__tests__/parser.test.js
+++ b/__tests__/parser.test.js
@@ -139,6 +139,18 @@ describe('parse', () => {
     })
   })
 
+  it('parses additive bonuses', () => {
+    expect(parse('3d4+1')).toEqual({
+      type: 'bonusAdd',
+      left: {
+        type: 'd',
+        left: { type: 'constant', value: 3 },
+        right: { type: 'constant', value: 4 }
+      },
+      right: { type: 'constant', value: 1 }
+    })
+  })
+
   describe('parsing parentheses', () => {
     test('(1d6)d6', () => {
       expect(parse('(1d6)d6')).toEqual({
diff --git a/index.js b/index.js
index 4a58e4a..2ddad5b 100644
--- a/index.js
+++ b/index.js
@@ -17,6 +17,8 @@ const interpret = tree => {
     return D.subtract(interpret(tree.left), interpret(tree.right))
   case 'negative':
     return D.negative(interpret(tree.value))
+  case 'bonusAdd':
+    return D.bonusAdd(interpret(tree.left), interpret(tree.right))
   }
 }
 
diff --git a/src/lexer.js b/src/lexer.js
index 8635e4a..2b3b25a 100644
--- a/src/lexer.js
+++ b/src/lexer.js
@@ -18,6 +18,7 @@ newValueLexeme('constant', '\\d+', Number)
 newLexemeType('d', 'd')
 newLexemeType('bigPlus', ' \\+ ' )
 newLexemeType('bigMinus', ' - ')
+newLexemeType('plus', '\\+')
 newLexemeType('minus', '-')
 newLexemeType('(', '\\(')
 newLexemeType(')', '\\)')
diff --git a/src/parser.js b/src/parser.js
index 588f480..c55fee6 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -64,6 +64,7 @@ newDieOperation('E')
 newDieOperation('K')
 
 newInfix('bigPlus', 20, { type: 'add' })
+newInfix('plus', 20, { type: 'bonusAdd' })
 newInfix('bigMinus', 20, { type: 'subtract' })
 newSymbol('minus', (parser) => {
   return {
-- 
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