Package tech.ixor.calclox

Class LoxFunction

java.lang.Object

tech.ixor.calclox.LoxFunction

All Implemented Interfaces:

LoxCallable

public class LoxFunction
extends Object
implements LoxCallable

Runtime representation of a user-defined CalcLox function.

A function retains the environment in which it was declared, allowing its body to access captured variables when invoked later.

Field Summary

Fields

Modifier and Type	Field	Description
protected final Environment	closure	The variable scope of the function.
protected final Statement.Function	declaration	Parsed declaration containing the function name, parameters, and body.

Constructor Summary

Constructors

Constructor	Description
LoxFunction(Statement.Function declaration, Environment closure)	Creates a function closure.

Method Summary

Modifier and Type	Method	Description
int	arity()	Returns the required argument count.
Object	call(Interpreter interpreter, List<Object> arguments)	Invokes the callable with already evaluated arguments.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

declaration

protected final Statement.Function declaration

Parsed declaration containing the function name, parameters, and body.

closure

protected final Environment closure

The variable scope of the function.

Constructor Details

LoxFunction

public LoxFunction(Statement.Function declaration,
 Environment closure)

Creates a function closure.

Parameters:

declaration - parsed function declaration

closure - declaration-time lexical environment

Method Details

toString

public String toString()

Overrides:

toString in class Object

arity

public int arity()

Description copied from interface: LoxCallable

Returns the required argument count.

Specified by:

arity in interface LoxCallable

Returns:

the exact number of arguments accepted by this callable

call

public Object call(Interpreter interpreter,
 List<Object> arguments)

Description copied from interface: LoxCallable

Invokes the callable with already evaluated arguments.

Specified by:

call in interface LoxCallable

Parameters:

interpreter - active interpreter

arguments - argument values in source order

Returns:

the call result, or null for CalcLox nil