From 68a2ebd34fc94488e89ffb82b359ec6e7e152ae9 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Thu, 8 Jul 2021 00:14:31 -0700
Subject: Restructure project to make room for clox

---
 .../com/craftinginterpreters/lox/LoxFunction.java  | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 jlox/src/com/craftinginterpreters/lox/LoxFunction.java

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

diff --git a/jlox/src/com/craftinginterpreters/lox/LoxFunction.java b/jlox/src/com/craftinginterpreters/lox/LoxFunction.java
new file mode 100644
index 0000000..07dd727
--- /dev/null
+++ b/jlox/src/com/craftinginterpreters/lox/LoxFunction.java
@@ -0,0 +1,52 @@
+package com.craftinginterpreters.lox;
+
+import java.util.List;
+
+class LoxFunction implements LoxCallable {
+    private final Stmt.Function declaration;
+    private final Environment closure;
+    private final boolean isInitializer;
+
+    LoxFunction(Stmt.Function declaration, Environment closure, boolean isInitializer) {
+        this.isInitializer = isInitializer;
+        this.closure = closure;
+        this.declaration = declaration;
+    }
+
+    LoxFunction bind(LoxInstance instance) {
+        Environment environment = new Environment(closure);
+        environment.define("this", instance);
+        return new LoxFunction(declaration, environment, isInitializer);
+    }
+
+    @Override
+    public int arity() {
+        return declaration.params.size();
+    }
+
+    @Override
+    public Object call(Interpreter interpreter, List<Object> arguments) {
+        Environment environment = new Environment(closure);
+
+        for (int i = 0; i < declaration.params.size(); i++) {
+            environment.define(declaration.params.get(i).lexeme, arguments.get(i));
+        }
+
+        try {
+            interpreter.executeBlock(declaration.body, environment);
+        } catch (Return returnValue) {
+            if (isInitializer)
+                return closure.getAt(0, "this");
+            return returnValue.value;
+        }
+
+        if (isInitializer)
+            return closure.getAt(0, "this");
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "<fn " + declaration.name.lexeme + ">";
+    }
+}
-- 
cgit v1.2.3-54-g00ecf