diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libsyntax/parse/parser.rs | 176 |
1 files changed, 108 insertions, 68 deletions
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs index 03c788aee58..d19364f5f44 100644 --- a/src/libsyntax/parse/parser.rs +++ b/src/libsyntax/parse/parser.rs @@ -60,7 +60,7 @@ use ast::{ViewPath, ViewPathGlob, ViewPathList, ViewPathSimple}; use ast::{Visibility, WhereClause}; use ast; use ast_util::{self, AS_PREC, ident_to_path, operator_prec}; -use codemap::{self, Span, BytePos, Spanned, spanned, mk_sp}; +use codemap::{self, Span, BytePos, Spanned, spanned, mk_sp, CodeMap}; use diagnostic; use ext::tt::macro_parser; use parse; @@ -297,6 +297,24 @@ fn is_plain_ident_or_underscore(t: &token::Token) -> bool { t.is_plain_ident() || *t == token::Underscore } +/// Information about the path to a module. +pub struct ModulePath { + pub name: String, + pub path_exists: bool, + pub result: Result<ModulePathSuccess, ModulePathError>, +} + +pub struct ModulePathSuccess { + pub path: ::std::path::PathBuf, + pub owns_directory: bool, +} + +pub struct ModulePathError { + pub err_msg: String, + pub help_msg: String, +} + + impl<'a> Parser<'a> { pub fn new(sess: &'a ParseSess, cfg: ast::CrateConfig, @@ -4861,82 +4879,104 @@ impl<'a> Parser<'a> { self.mod_path_stack.pop().unwrap(); } - /// Read a module from a source file. - fn eval_src_mod(&mut self, - id: ast::Ident, - outer_attrs: &[ast::Attribute], - id_sp: Span) - -> PResult<(ast::Item_, Vec<ast::Attribute> )> { + pub fn submod_path_from_attr(attrs: &[ast::Attribute], dir_path: &Path) -> Option<PathBuf> { + ::attr::first_attr_value_str_by_name(attrs, "path").map(|d| dir_path.join(&*d)) + } + + /// Returns either a path to a module, or . + pub fn default_submod_path(id: ast::Ident, dir_path: &Path, codemap: &CodeMap) -> ModulePath + { + let mod_string = token::get_ident(id); + let mod_name = mod_string.to_string(); + let default_path_str = format!("{}.rs", mod_name); + let secondary_path_str = format!("{}/mod.rs", mod_name); + let default_path = dir_path.join(&default_path_str); + let secondary_path = dir_path.join(&secondary_path_str); + let default_exists = codemap.file_exists(&default_path); + let secondary_exists = codemap.file_exists(&secondary_path); + + let result = match (default_exists, secondary_exists) { + (true, false) => Ok(ModulePathSuccess { path: default_path, owns_directory: false }), + (false, true) => Ok(ModulePathSuccess { path: secondary_path, owns_directory: true }), + (false, false) => Err(ModulePathError { + err_msg: format!("file not found for module `{}`", mod_name), + help_msg: format!("name the file either {} or {} inside the directory {:?}", + default_path_str, + secondary_path_str, + dir_path.display()), + }), + (true, true) => Err(ModulePathError { + err_msg: format!("file for module `{}` found at both {} and {}", + mod_name, + default_path_str, + secondary_path_str), + help_msg: "delete or rename one of them to remove the ambiguity".to_owned(), + }), + }; + + ModulePath { + name: mod_name, + path_exists: default_exists || secondary_exists, + result: result, + } + } + + fn submod_path(&mut self, + id: ast::Ident, + outer_attrs: &[ast::Attribute], + id_sp: Span) -> PResult<ModulePathSuccess> { let mut prefix = PathBuf::from(&self.sess.codemap().span_to_filename(self.span)); prefix.pop(); let mut dir_path = prefix; for part in &self.mod_path_stack { dir_path.push(&**part); } - let mod_string = token::get_ident(id); - let (file_path, owns_directory) = match ::attr::first_attr_value_str_by_name( - outer_attrs, "path") { - Some(d) => (dir_path.join(&*d), true), - None => { - let mod_name = mod_string.to_string(); - let default_path_str = format!("{}.rs", mod_name); - let secondary_path_str = format!("{}/mod.rs", mod_name); - let default_path = dir_path.join(&default_path_str[..]); - let secondary_path = dir_path.join(&secondary_path_str[..]); - let default_exists = self.sess.codemap().file_exists(&default_path); - let secondary_exists = self.sess.codemap().file_exists(&secondary_path); - - if !self.owns_directory { - self.span_err(id_sp, - "cannot declare a new module at this location"); - let this_module = match self.mod_path_stack.last() { - Some(name) => name.to_string(), - None => self.root_module_name.as_ref().unwrap().clone(), - }; - self.span_note(id_sp, - &format!("maybe move this module `{0}` \ - to its own directory via \ - `{0}/mod.rs`", - this_module)); - if default_exists || secondary_exists { - self.span_note(id_sp, - &format!("... or maybe `use` the module \ - `{}` instead of possibly \ - redeclaring it", - mod_name)); - } - self.abort_if_errors(); - } - match (default_exists, secondary_exists) { - (true, false) => (default_path, false), - (false, true) => (secondary_path, true), - (false, false) => { - return Err(self.span_fatal_help(id_sp, - &format!("file not found for module `{}`", - mod_name), - &format!("name the file either {} or {} inside \ - the directory {:?}", - default_path_str, - secondary_path_str, - dir_path.display()))); - } - (true, true) => { - return Err(self.span_fatal_help( - id_sp, - &format!("file for module `{}` found at both {} \ - and {}", - mod_name, - default_path_str, - secondary_path_str), - "delete or rename one of them to remove the ambiguity")); - } - } + if let Some(p) = Parser::submod_path_from_attr(outer_attrs, &dir_path) { + return Ok(ModulePathSuccess { path: p, owns_directory: true }); + } + + let paths = Parser::default_submod_path(id, &dir_path, self.sess.codemap()); + + if !self.owns_directory { + self.span_err(id_sp, "cannot declare a new module at this location"); + let this_module = match self.mod_path_stack.last() { + Some(name) => name.to_string(), + None => self.root_module_name.as_ref().unwrap().clone(), + }; + self.span_note(id_sp, + &format!("maybe move this module `{0}` to its own directory \ + via `{0}/mod.rs`", + this_module)); + if paths.path_exists { + self.span_note(id_sp, + &format!("... or maybe `use` the module `{}` instead \ + of possibly redeclaring it", + paths.name)); } - }; + self.abort_if_errors(); + } + + match paths.result { + Ok(succ) => Ok(succ), + Err(err) => Err(self.span_fatal_help(id_sp, &err.err_msg, &err.help_msg)), + } + } - self.eval_src_mod_from_path(file_path, owns_directory, - mod_string.to_string(), id_sp) + /// Read a module from a source file. + fn eval_src_mod(&mut self, + id: ast::Ident, + outer_attrs: &[ast::Attribute], + id_sp: Span) + -> PResult<(ast::Item_, Vec<ast::Attribute> )> { + let ModulePathSuccess { path, owns_directory } = try!(self.submod_path(id, + outer_attrs, + id_sp)); + + self.eval_src_mod_from_path(path, + owns_directory, + token::get_ident(id).to_string(), + id_sp) } fn eval_src_mod_from_path(&mut self, |