47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// 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.
|
|
|
|
use std::sync::Arc;
|
|
|
|
use clean::{Crate, Item};
|
|
use clean::cfg::Cfg;
|
|
use fold::DocFolder;
|
|
|
|
pub fn propagate_doc_cfg(cr: Crate) -> Crate {
|
|
CfgPropagator { parent_cfg: None }.fold_crate(cr)
|
|
}
|
|
|
|
struct CfgPropagator {
|
|
parent_cfg: Option<Arc<Cfg>>,
|
|
}
|
|
|
|
impl DocFolder for CfgPropagator {
|
|
fn fold_item(&mut self, mut item: Item) -> Option<Item> {
|
|
let old_parent_cfg = self.parent_cfg.clone();
|
|
|
|
let new_cfg = match (self.parent_cfg.take(), item.attrs.cfg.take()) {
|
|
(None, None) => None,
|
|
(Some(rc), None) | (None, Some(rc)) => Some(rc),
|
|
(Some(mut a), Some(b)) => {
|
|
let b = Arc::try_unwrap(b).unwrap_or_else(|rc| Cfg::clone(&rc));
|
|
*Arc::make_mut(&mut a) &= b;
|
|
Some(a)
|
|
}
|
|
};
|
|
self.parent_cfg = new_cfg.clone();
|
|
item.attrs.cfg = new_cfg;
|
|
|
|
let result = self.fold_item_recur(item);
|
|
self.parent_cfg = old_parent_cfg;
|
|
|
|
result
|
|
}
|
|
}
|