Add function calls

1 files changed, 33 insertions, 0 deletions

diff --git a/src/com/craftinginterpreters/lox/LoxFunction.java b/src/com/craftinginterpreters/lox/LoxFunction.java
new file mode 100644
index 0000000..d2e367b
--- /dev/null
+++ b/src/com/craftinginterpreters/lox/LoxFunction.java
@@ -0,0 +1,33 @@
+package com.craftinginterpreters.lox;
+
+import java.util.List;
+
+class LoxFunction implements LoxCallable {
+    private final Stmt.Function declaration;
+
+    LoxFunction(Stmt.Function declaration) {
+        this.declaration = declaration;
+    }
+
+    @Override
+    public int arity() {
+        return declaration.params.size();
+    }
+
+    @Override
+    public Object call(Interpreter interpreter, List<Object> arguments) {
+        Environment environment = new Environment(interpreter.globals);
+
+        for (int i = 0; i < declaration.params.size(); i++) {
+            environment.define(declaration.params.get(i).lexeme, arguments.get(i));
+        }
+
+        interpreter.executeBlock(declaration.body, environment);
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "<fn " + declaration.name.lexeme + ">";
+    }
+}