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|
//! This module resolves `mod foo;` declaration to file.
use std::{borrow::Cow, sync::Arc};
use ra_db::{FileId, SourceRoot};
use ra_syntax::SmolStr;
use relative_path::RelativePathBuf;
use crate::{DefDatabase, HirFileId, Name};
#[derive(Clone, Copy)]
pub(super) struct ParentModule<'a> {
pub(super) name: &'a Name,
pub(super) attr_path: Option<&'a SmolStr>,
}
impl<'a> ParentModule<'a> {
fn attribute_path(&self) -> Option<&SmolStr> {
self.attr_path.filter(|p| !p.is_empty())
}
}
pub(super) fn resolve_submodule(
db: &impl DefDatabase,
file_id: HirFileId,
name: &Name,
is_root: bool,
attr_path: Option<&SmolStr>,
parent_module: Option<ParentModule<'_>>,
) -> Result<FileId, RelativePathBuf> {
let file_id = file_id.original_file(db);
let source_root_id = db.file_source_root(file_id);
let path = db.file_relative_path(file_id);
let root = RelativePathBuf::default();
let dir_path = path.parent().unwrap_or(&root);
let mod_name = path.file_stem().unwrap_or("unknown");
let resolve_mode = match (attr_path.filter(|p| !p.is_empty()), parent_module) {
(Some(file_path), Some(parent_module)) => {
let file_path = normalize_attribute_path(file_path);
match parent_module.attribute_path() {
Some(parent_module_attr_path) => {
let path = dir_path
.join(format!(
"{}/{}",
normalize_attribute_path(parent_module_attr_path),
file_path
))
.normalize();
ResolutionMode::InlineModuleWithAttributePath(
InsideInlineModuleMode::WithAttributePath(path),
)
}
None => {
let path =
dir_path.join(format!("{}/{}", parent_module.name, file_path)).normalize();
ResolutionMode::InsideInlineModule(InsideInlineModuleMode::WithAttributePath(
path,
))
}
}
}
(None, Some(parent_module)) => match parent_module.attribute_path() {
Some(parent_module_attr_path) => {
let path = dir_path.join(format!(
"{}/{}.rs",
normalize_attribute_path(parent_module_attr_path),
name
));
ResolutionMode::InlineModuleWithAttributePath(InsideInlineModuleMode::File(path))
}
None => {
let path = dir_path.join(format!("{}/{}.rs", parent_module.name, name));
ResolutionMode::InsideInlineModule(InsideInlineModuleMode::File(path))
}
},
(Some(file_path), None) => {
let file_path = normalize_attribute_path(file_path);
let path = dir_path.join(file_path.as_ref()).normalize();
ResolutionMode::OutOfLine(OutOfLineMode::WithAttributePath(path))
}
(None, None) => {
let is_dir_owner = is_root || mod_name == "mod";
if is_dir_owner {
let file_mod = dir_path.join(format!("{}.rs", name));
let dir_mod = dir_path.join(format!("{}/mod.rs", name));
ResolutionMode::OutOfLine(OutOfLineMode::RootOrModRs {
file: file_mod,
directory: dir_mod,
})
} else {
let path = dir_path.join(format!("{}/{}.rs", mod_name, name));
ResolutionMode::OutOfLine(OutOfLineMode::FileInDirectory(path))
}
}
};
resolve_mode.resolve(db.source_root(source_root_id))
}
fn normalize_attribute_path(file_path: &SmolStr) -> Cow<str> {
let current_dir = "./";
let windows_path_separator = r#"\"#;
let current_dir_normalize = if file_path.starts_with(current_dir) {
&file_path[current_dir.len()..]
} else {
file_path.as_str()
};
if current_dir_normalize.contains(windows_path_separator) {
Cow::Owned(current_dir_normalize.replace(windows_path_separator, "/"))
} else {
Cow::Borrowed(current_dir_normalize)
}
}
enum OutOfLineMode {
RootOrModRs { file: RelativePathBuf, directory: RelativePathBuf },
FileInDirectory(RelativePathBuf),
WithAttributePath(RelativePathBuf),
}
impl OutOfLineMode {
pub fn resolve(&self, source_root: Arc<SourceRoot>) -> Result<FileId, RelativePathBuf> {
match self {
OutOfLineMode::RootOrModRs { file, directory } => {
match source_root.file_by_relative_path(file) {
None => resolve_simple_path(source_root, directory).map_err(|_| file.clone()),
file_id => resolve_find_result(file_id, file),
}
}
OutOfLineMode::FileInDirectory(path) => resolve_simple_path(source_root, path),
OutOfLineMode::WithAttributePath(path) => resolve_simple_path(source_root, path),
}
}
}
enum InsideInlineModuleMode {
File(RelativePathBuf),
WithAttributePath(RelativePathBuf),
}
impl InsideInlineModuleMode {
pub fn resolve(&self, source_root: Arc<SourceRoot>) -> Result<FileId, RelativePathBuf> {
match self {
InsideInlineModuleMode::File(path) => resolve_simple_path(source_root, path),
InsideInlineModuleMode::WithAttributePath(path) => {
resolve_simple_path(source_root, path)
}
}
}
}
enum ResolutionMode {
OutOfLine(OutOfLineMode),
InsideInlineModule(InsideInlineModuleMode),
InlineModuleWithAttributePath(InsideInlineModuleMode),
}
impl ResolutionMode {
pub fn resolve(&self, source_root: Arc<SourceRoot>) -> Result<FileId, RelativePathBuf> {
use self::ResolutionMode::*;
match self {
OutOfLine(mode) => mode.resolve(source_root),
InsideInlineModule(mode) => mode.resolve(source_root),
InlineModuleWithAttributePath(mode) => mode.resolve(source_root),
}
}
}
fn resolve_simple_path(
source_root: Arc<SourceRoot>,
path: &RelativePathBuf,
) -> Result<FileId, RelativePathBuf> {
resolve_find_result(source_root.file_by_relative_path(path), path)
}
fn resolve_find_result(
file_id: Option<FileId>,
path: &RelativePathBuf,
) -> Result<FileId, RelativePathBuf> {
match file_id {
Some(file_id) => Ok(file_id.clone()),
None => Err(path.clone()),
}
}
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