From 922a8f68637f24fc447a8d687b75a676d3b310bb Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Wed, 20 Jan 2021 22:52:47 -0800
Subject: Add function calling syntax

---
 src/com/craftinginterpreters/lox/Interpreter.java | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/com/craftinginterpreters/lox/Interpreter.java')

diff --git a/src/com/craftinginterpreters/lox/Interpreter.java b/src/com/craftinginterpreters/lox/Interpreter.java
index 9d0cfb3..f752e77 100644
--- a/src/com/craftinginterpreters/lox/Interpreter.java
+++ b/src/com/craftinginterpreters/lox/Interpreter.java
@@ -1,5 +1,6 @@
 package com.craftinginterpreters.lox;
 
+import java.util.ArrayList;
 import java.util.List;
 
 class Interpreter implements Expr.Visitor<Object>, Stmt.Visitor<Void> {
@@ -222,6 +223,27 @@ class Interpreter implements Expr.Visitor<Object>, Stmt.Visitor<Void> {
         return null;
     }
 
+    @Override
+    public Object visitCallExpr(Expr.Call expr) {
+        Object callee = evaluate(expr.callee);
+
+        List<Object> arguments = new ArrayList<>();
+        for (Expr argument : expr.arguments) {
+            arguments.add(evaluate(argument));
+        }
+
+        if (!(callee instanceof LoxCallable)) {
+            throw new RuntimeError(expr.paren, "Can only call functions and classes.");
+        }
+
+        LoxCallable function = (LoxCallable) callee;
+        if (arguments.size() != function.arity()) {
+            throw new RuntimeError(expr.paren, "Expected " + function.arity() + " arguments but got " + arguments.size() + ".");
+        }
+
+        return function.call(this, arguments);
+    }
+
     public void interpret(List<Stmt> statements) {
         try {
             for (Stmt statement : statements) {
-- 
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