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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 + ">";
}
}
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