From 1426322eb4898cd49310c1dc30cdfc8ad8e73402 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Tue, 22 Aug 2017 18:01:48 -0400
Subject: Parse negative bonuses

---
 src/dice.js   | 10 ++++++++++
 src/parser.js |  1 +
 2 files changed, 11 insertions(+)

(limited to 'src')

diff --git a/src/dice.js b/src/dice.js
index becf7dc..58467c4 100644
--- a/src/dice.js
+++ b/src/dice.js
@@ -102,6 +102,15 @@ const bonusAdd = (die1, die2) => {
   }
 }
 
+const bonusSubtract = (die1, die2) => {
+  const negative2 = negative(die2)
+  return () => {
+    return die1().map(die => {
+      return () => die() + roll(negative2)
+    })
+  }
+}
+
 exports.pool = pool
 exports.roll = roll
 exports.constant = constant
@@ -113,3 +122,4 @@ exports.explode = explode
 exports.keepHigh = keepHigh
 exports.keepLow = keepLow
 exports.bonusAdd = bonusAdd
+exports.bonusSubtract = bonusSubtract
diff --git a/src/parser.js b/src/parser.js
index 48de2ab..244cdd1 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -66,6 +66,7 @@ newDieOperation('k')
 
 newInfix('bigPlus', 20, { type: 'add' })
 newInfix('plus', 20, { type: 'bonusAdd' })
+newInfix('minus', 20, { type: 'bonusSubtract' })
 newInfix('bigMinus', 20, { type: 'subtract' })
 newSymbol('minus', (parser) => {
   return {
-- 
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