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//-
// Copyright 2017, 2018 Jason Lingle
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Macros for internal use to reduce boilerplate.
// Pervasive internal sugar
macro_rules! mapfn {
($({#[$allmeta:meta]})* $(#[$meta:meta])* [$($vis:tt)*]
fn $name:ident[$($gen:tt)*]($parm:ident: $input:ty) -> $output:ty {
$($body:tt)*
}) => {
$(#[$allmeta])* $(#[$meta])*
#[derive(Clone, Copy, Debug)]
$($vis)* struct $name;
$(#[$allmeta])*
impl $($gen)* $crate::strategy::statics::MapFn<$input> for $name {
type Output = $output;
fn apply(&self, $parm: $input) -> $output {
$($body)*
}
}
}
}
macro_rules! delegate_vt_0 {
() => {
fn current(&self) -> Self::Value {
self.0.current()
}
fn simplify(&mut self) -> bool {
self.0.simplify()
}
fn complicate(&mut self) -> bool {
self.0.complicate()
}
};
}
macro_rules! opaque_strategy_wrapper {
($({#[$allmeta:meta]})*
$(#[$smeta:meta])*
pub struct $stratname:ident
[$($sgen:tt)*][$($swhere:tt)*]
($innerstrat:ty) -> $stratvtty:ty;
$(#[$vmeta:meta])* pub struct $vtname:ident
[$($vgen:tt)*][$($vwhere:tt)*]
($innervt:ty) -> $actualty:ty;
) => {
$(#[$allmeta])*
$(#[$smeta])*
#[must_use = "strategies do nothing unless used"]
pub struct $stratname $($sgen)* ($innerstrat)
$($swhere)*;
$(#[$allmeta])*
$(#[$vmeta])* pub struct $vtname $($vgen)* ($innervt) $($vwhere)*;
$(#[$allmeta])*
impl $($sgen)* Strategy for $stratname $($sgen)* $($swhere)* {
type Tree = $stratvtty;
type Value = $actualty;
fn new_tree(&self, runner: &mut TestRunner) -> NewTree<Self> {
self.0.new_tree(runner).map($vtname)
}
}
$(#[$allmeta])*
impl $($vgen)* ValueTree for $vtname $($vgen)* $($vwhere)* {
type Value = $actualty;
delegate_vt_0!();
}
}
}
// Example: unwrap_or!(result, err => handle_err(err));
macro_rules! unwrap_or {
($unwrap: expr, $err: ident => $on_err: expr) => {
match $unwrap {
Ok(ok) => ok,
Err($err) => $on_err,
}
};
}
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