Update index.js

1 files changed, 26 insertions, 0 deletions

diff --git a/index.js b/index.js
index e69de29..8cdfe1e 100644
--- a/index.js
+++ b/index.js
@@ -0,0 +1,26 @@
+const P = require('./src/parser.js')
+const D = require('./src/dice.js')
+
+const interpret = tree => {
+  switch(tree.type) {
+  case 'constant':
+    return D.constant(tree.value)
+  case 'd':
+    return D.d(interpret(tree.left), interpret(tree.right))
+  case 'add':
+    return D.add(interpret(tree.left), interpret(tree.right))
+  case 'subtract':
+    return D.subtract(interpret(tree.left), interpret(tree.right))
+  case 'negative':
+    return D.negative(interpret(tree.value))
+  }
+}
+
+const parse = expressionString => {
+  const tree = P.parse(expressionString)
+  return interpret(tree)
+}
+
+exports.parse = parse
+exports.roll = D.roll
+exports.pool = D.pool