rust/src/modules.rs

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// Copyright 2015 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::collections::BTreeMap;
use std::path::{Path, PathBuf};
use syntax::ast;
use syntax::codemap;
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use syntax::parse::parser;
use utils::contains_skip;
/// List all the files containing modules of a crate.
/// If a file is used twice in a crate, it appears only once.
pub fn list_files<'a>(
krate: &'a ast::Crate,
codemap: &codemap::CodeMap,
) -> BTreeMap<PathBuf, &'a ast::Mod> {
let mut result = BTreeMap::new(); // Enforce file order determinism
let root_filename: PathBuf = codemap.span_to_filename(krate.span).into();
list_submodules(
&krate.module,
root_filename.parent().unwrap(),
codemap,
&mut result,
);
result.insert(root_filename, &krate.module);
result
}
/// Recursively list all external modules included in a module.
fn list_submodules<'a>(
module: &'a ast::Mod,
search_dir: &Path,
codemap: &codemap::CodeMap,
result: &mut BTreeMap<PathBuf, &'a ast::Mod>,
) {
debug!("list_submodules: search_dir: {:?}", search_dir);
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for item in &module.items {
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if let ast::ItemKind::Mod(ref sub_mod) = item.node {
if !contains_skip(&item.attrs) {
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let is_internal =
codemap.span_to_filename(item.span) == codemap.span_to_filename(sub_mod.inner);
let dir_path = if is_internal {
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search_dir.join(&item.ident.to_string())
} else {
let mod_path = module_file(item.ident, &item.attrs, search_dir, codemap);
let dir_path = mod_path.parent().unwrap().to_owned();
result.insert(mod_path, sub_mod);
dir_path
};
list_submodules(sub_mod, &dir_path, codemap, result);
}
}
}
}
/// Find the file corresponding to an external mod
fn module_file(
id: ast::Ident,
attrs: &[ast::Attribute],
dir_path: &Path,
codemap: &codemap::CodeMap,
) -> PathBuf {
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if let Some(path) = parser::Parser::submod_path_from_attr(attrs, dir_path) {
return path;
}
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match parser::Parser::default_submod_path(id, dir_path, codemap).result {
Ok(parser::ModulePathSuccess { path, .. }) => path,
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Err(_) => panic!("Couldn't find module {}", id),
}
}