val 0.6.0

An arbitrary precision calculator language
Documentation 
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use super::*;

#[derive(Clone, Debug)]
pub enum Function {
  Builtin(BuiltinFunction),
  UserDefined(Gc<UserFunction>),
}

impl Function {
  pub(crate) fn call(
    &self,
    arguments: Vec<Value>,
    config: Config,
    span: &Span,
  ) -> Result<Value> {
    match self {
      Self::Builtin(function) => function.call(arguments, config, span),
      Self::UserDefined(function) => UserFunction::call(function, arguments),
    }
  }

  pub(crate) fn check_arity(&self, len: usize, span: &Span) -> Result<()> {
    match self {
      Self::Builtin(function) => function.check_arity(len, span),
      Self::UserDefined(function) => function.check_arity(len, span),
    }
  }

  pub(crate) fn name(&self) -> &str {
    match self {
      Self::Builtin(function) => function.name,
      Self::UserDefined(function) => function.name(),
    }
  }
}

impl Finalize for Function {}

impl PartialEq for Function {
  fn eq(&self, other: &Self) -> bool {
    match (self, other) {
      (Self::Builtin(a), Self::Builtin(b)) => a.name == b.name,
      (Self::UserDefined(a), Self::UserDefined(b)) => Gc::ptr_eq(a, b),
      _ => false,
    }
  }
}

unsafe impl Trace for Function {
  gc::custom_trace!(this, {
    match this {
      Self::Builtin(_) => {}
      Self::UserDefined(function) => unsafe { mark(function) },
    }
  });
}