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Diffstat (limited to 'src/librustc_parse/parser/module.rs')
| -rw-r--r-- | src/librustc_parse/parser/module.rs | 306 |
1 files changed, 0 insertions, 306 deletions
diff --git a/src/librustc_parse/parser/module.rs b/src/librustc_parse/parser/module.rs deleted file mode 100644 index b436f1969bb..00000000000 --- a/src/librustc_parse/parser/module.rs +++ /dev/null @@ -1,306 +0,0 @@ -use super::diagnostics::Error; -use super::item::ItemInfo; -use super::Parser; - -use crate::{new_sub_parser_from_file, DirectoryOwnership}; - -use rustc_ast::ast::{self, Attribute, Crate, Ident, ItemKind, Mod}; -use rustc_ast::attr; -use rustc_ast::token::{self, TokenKind}; -use rustc_errors::PResult; -use rustc_span::source_map::{FileName, SourceMap, Span, DUMMY_SP}; -use rustc_span::symbol::sym; - -use std::path::{self, Path, PathBuf}; - -/// Information about the path to a module. -// Public for rustfmt usage. -pub struct ModulePath { - name: String, - path_exists: bool, - pub result: Result<ModulePathSuccess, Error>, -} - -// Public for rustfmt usage. -pub struct ModulePathSuccess { - pub path: PathBuf, - pub directory_ownership: DirectoryOwnership, -} - -impl<'a> Parser<'a> { - /// Parses a source module as a crate. This is the main entry point for the parser. - pub fn parse_crate_mod(&mut self) -> PResult<'a, Crate> { - let lo = self.token.span; - let krate = Ok(ast::Crate { - attrs: self.parse_inner_attributes()?, - module: self.parse_mod_items(&token::Eof, lo)?, - span: lo.to(self.token.span), - // Filled in by proc_macro_harness::inject() - proc_macros: Vec::new(), - }); - krate - } - - /// Parses a `mod <foo> { ... }` or `mod <foo>;` item. - pub(super) fn parse_item_mod(&mut self, attrs: &mut Vec<Attribute>) -> PResult<'a, ItemInfo> { - let in_cfg = crate::config::process_configure_mod(self.sess, self.cfg_mods, attrs); - - let id_span = self.token.span; - let id = self.parse_ident()?; - let (module, mut inner_attrs) = if self.eat(&token::Semi) { - if in_cfg && self.recurse_into_file_modules { - // This mod is in an external file. Let's go get it! - let ModulePathSuccess { path, directory_ownership } = - self.submod_path(id, &attrs, id_span)?; - self.eval_src_mod(path, directory_ownership, id.to_string(), id_span)? - } else { - (ast::Mod { inner: DUMMY_SP, items: Vec::new(), inline: false }, Vec::new()) - } - } else { - let old_directory = self.directory.clone(); - self.push_directory(id, &attrs); - - self.expect(&token::OpenDelim(token::Brace))?; - let mod_inner_lo = self.token.span; - let inner_attrs = self.parse_inner_attributes()?; - let module = self.parse_mod_items(&token::CloseDelim(token::Brace), mod_inner_lo)?; - - self.directory = old_directory; - (module, inner_attrs) - }; - attrs.append(&mut inner_attrs); - Ok((id, ItemKind::Mod(module))) - } - - /// Given a termination token, parses all of the items in a module. - fn parse_mod_items(&mut self, term: &TokenKind, inner_lo: Span) -> PResult<'a, Mod> { - let mut items = vec![]; - while let Some(item) = self.parse_item()? { - items.push(item); - self.maybe_consume_incorrect_semicolon(&items); - } - - if !self.eat(term) { - let token_str = super::token_descr(&self.token); - if !self.maybe_consume_incorrect_semicolon(&items) { - let msg = &format!("expected item, found {}", token_str); - let mut err = self.struct_span_err(self.token.span, msg); - err.span_label(self.token.span, "expected item"); - return Err(err); - } - } - - let hi = if self.token.span.is_dummy() { inner_lo } else { self.prev_token.span }; - - Ok(Mod { inner: inner_lo.to(hi), items, inline: true }) - } - - fn submod_path( - &mut self, - id: ast::Ident, - outer_attrs: &[Attribute], - id_sp: Span, - ) -> PResult<'a, ModulePathSuccess> { - if let Some(path) = Parser::submod_path_from_attr(outer_attrs, &self.directory.path) { - return Ok(ModulePathSuccess { - directory_ownership: match path.file_name().and_then(|s| s.to_str()) { - // All `#[path]` files are treated as though they are a `mod.rs` file. - // This means that `mod foo;` declarations inside `#[path]`-included - // files are siblings, - // - // Note that this will produce weirdness when a file named `foo.rs` is - // `#[path]` included and contains a `mod foo;` declaration. - // If you encounter this, it's your own darn fault :P - Some(_) => DirectoryOwnership::Owned { relative: None }, - _ => DirectoryOwnership::UnownedViaMod, - }, - path, - }); - } - - let relative = match self.directory.ownership { - DirectoryOwnership::Owned { relative } => relative, - DirectoryOwnership::UnownedViaBlock | DirectoryOwnership::UnownedViaMod => None, - }; - let paths = - Parser::default_submod_path(id, relative, &self.directory.path, self.sess.source_map()); - - match self.directory.ownership { - DirectoryOwnership::Owned { .. } => { - paths.result.map_err(|err| self.span_fatal_err(id_sp, err)) - } - DirectoryOwnership::UnownedViaBlock => { - let msg = "Cannot declare a non-inline module inside a block \ - unless it has a path attribute"; - let mut err = self.struct_span_err(id_sp, msg); - if paths.path_exists { - let msg = format!( - "Maybe `use` the module `{}` instead of redeclaring it", - paths.name - ); - err.span_note(id_sp, &msg); - } - Err(err) - } - DirectoryOwnership::UnownedViaMod => { - let mut err = - self.struct_span_err(id_sp, "cannot declare a new module at this location"); - if !id_sp.is_dummy() { - let src_path = self.sess.source_map().span_to_filename(id_sp); - if let FileName::Real(src_path) = src_path { - if let Some(stem) = src_path.file_stem() { - let mut dest_path = src_path.clone(); - dest_path.set_file_name(stem); - dest_path.push("mod.rs"); - err.span_note( - id_sp, - &format!( - "maybe move this module `{}` to its own \ - directory via `{}`", - src_path.display(), - dest_path.display() - ), - ); - } - } - } - if paths.path_exists { - err.span_note( - id_sp, - &format!( - "... or maybe `use` the module `{}` instead \ - of possibly redeclaring it", - paths.name - ), - ); - } - Err(err) - } - } - } - - // Public for rustfmt usage. - pub fn submod_path_from_attr(attrs: &[Attribute], dir_path: &Path) -> Option<PathBuf> { - if let Some(s) = attr::first_attr_value_str_by_name(attrs, sym::path) { - let s = s.as_str(); - - // On windows, the base path might have the form - // `\\?\foo\bar` in which case it does not tolerate - // mixed `/` and `\` separators, so canonicalize - // `/` to `\`. - #[cfg(windows)] - let s = s.replace("/", "\\"); - Some(dir_path.join(&*s)) - } else { - None - } - } - - /// Returns a path to a module. - // Public for rustfmt usage. - pub fn default_submod_path( - id: ast::Ident, - relative: Option<ast::Ident>, - dir_path: &Path, - source_map: &SourceMap, - ) -> ModulePath { - // If we're in a foo.rs file instead of a mod.rs file, - // we need to look for submodules in - // `./foo/<id>.rs` and `./foo/<id>/mod.rs` rather than - // `./<id>.rs` and `./<id>/mod.rs`. - let relative_prefix_string; - let relative_prefix = if let Some(ident) = relative { - relative_prefix_string = format!("{}{}", ident.name, path::MAIN_SEPARATOR); - &relative_prefix_string - } else { - "" - }; - - let mod_name = id.name.to_string(); - let default_path_str = format!("{}{}.rs", relative_prefix, mod_name); - let secondary_path_str = - format!("{}{}{}mod.rs", relative_prefix, mod_name, path::MAIN_SEPARATOR); - let default_path = dir_path.join(&default_path_str); - let secondary_path = dir_path.join(&secondary_path_str); - let default_exists = source_map.file_exists(&default_path); - let secondary_exists = source_map.file_exists(&secondary_path); - - let result = match (default_exists, secondary_exists) { - (true, false) => Ok(ModulePathSuccess { - path: default_path, - directory_ownership: DirectoryOwnership::Owned { relative: Some(id) }, - }), - (false, true) => Ok(ModulePathSuccess { - path: secondary_path, - directory_ownership: DirectoryOwnership::Owned { relative: None }, - }), - (false, false) => Err(Error::FileNotFoundForModule { - mod_name: mod_name.clone(), - default_path: default_path_str, - secondary_path: secondary_path_str, - dir_path: dir_path.display().to_string(), - }), - (true, true) => Err(Error::DuplicatePaths { - mod_name: mod_name.clone(), - default_path: default_path_str, - secondary_path: secondary_path_str, - }), - }; - - ModulePath { name: mod_name, path_exists: default_exists || secondary_exists, result } - } - - /// Reads a module from a source file. - fn eval_src_mod( - &mut self, - path: PathBuf, - directory_ownership: DirectoryOwnership, - name: String, - id_sp: Span, - ) -> PResult<'a, (Mod, Vec<Attribute>)> { - let mut included_mod_stack = self.sess.included_mod_stack.borrow_mut(); - if let Some(i) = included_mod_stack.iter().position(|p| *p == path) { - let mut err = String::from("circular modules: "); - let len = included_mod_stack.len(); - for p in &included_mod_stack[i..len] { - err.push_str(&p.to_string_lossy()); - err.push_str(" -> "); - } - err.push_str(&path.to_string_lossy()); - return Err(self.struct_span_err(id_sp, &err[..])); - } - included_mod_stack.push(path.clone()); - drop(included_mod_stack); - - let mut p0 = - new_sub_parser_from_file(self.sess, &path, directory_ownership, Some(name), id_sp); - p0.cfg_mods = self.cfg_mods; - let mod_inner_lo = p0.token.span; - let mod_attrs = p0.parse_inner_attributes()?; - let mut m0 = p0.parse_mod_items(&token::Eof, mod_inner_lo)?; - m0.inline = false; - self.sess.included_mod_stack.borrow_mut().pop(); - Ok((m0, mod_attrs)) - } - - fn push_directory(&mut self, id: Ident, attrs: &[Attribute]) { - if let Some(path) = attr::first_attr_value_str_by_name(attrs, sym::path) { - self.directory.path.push(&*path.as_str()); - self.directory.ownership = DirectoryOwnership::Owned { relative: None }; - } else { - // We have to push on the current module name in the case of relative - // paths in order to ensure that any additional module paths from inline - // `mod x { ... }` come after the relative extension. - // - // For example, a `mod z { ... }` inside `x/y.rs` should set the current - // directory path to `/x/y/z`, not `/x/z` with a relative offset of `y`. - if let DirectoryOwnership::Owned { relative } = &mut self.directory.ownership { - if let Some(ident) = relative.take() { - // remove the relative offset - self.directory.path.push(&*ident.as_str()); - } - } - self.directory.path.push(&*id.as_str()); - } - } -} |