650 lines
19 KiB
Rust
650 lines
19 KiB
Rust
//! Builtin macro
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use crate::{
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db::AstDatabase, name, quote, AstId, CrateId, EagerMacroId, LazyMacroId, MacroCallId,
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MacroDefId, MacroDefKind, TextSize,
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};
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use either::Either;
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use mbe::parse_to_token_tree;
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use ra_db::FileId;
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use ra_parser::FragmentKind;
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use ra_syntax::ast::{self, AstToken, HasStringValue};
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macro_rules! register_builtin {
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( LAZY: $(($name:ident, $kind: ident) => $expand:ident),* , EAGER: $(($e_name:ident, $e_kind: ident) => $e_expand:ident),* ) => {
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum BuiltinFnLikeExpander {
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$($kind),*
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum EagerExpander {
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$($e_kind),*
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}
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impl BuiltinFnLikeExpander {
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pub fn expand(
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&self,
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db: &dyn AstDatabase,
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id: LazyMacroId,
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tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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let expander = match *self {
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$( BuiltinFnLikeExpander::$kind => $expand, )*
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};
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expander(db, id, tt)
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}
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}
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impl EagerExpander {
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pub fn expand(
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&self,
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db: &dyn AstDatabase,
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arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let expander = match *self {
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$( EagerExpander::$e_kind => $e_expand, )*
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};
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expander(db,arg_id,tt)
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}
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}
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fn find_by_name(ident: &name::Name) -> Option<Either<BuiltinFnLikeExpander, EagerExpander>> {
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match ident {
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$( id if id == &name::name![$name] => Some(Either::Left(BuiltinFnLikeExpander::$kind)), )*
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$( id if id == &name::name![$e_name] => Some(Either::Right(EagerExpander::$e_kind)), )*
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_ => return None,
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}
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}
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};
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}
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pub fn find_builtin_macro(
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ident: &name::Name,
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krate: CrateId,
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ast_id: AstId<ast::MacroCall>,
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) -> Option<MacroDefId> {
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let kind = find_by_name(ident)?;
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match kind {
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Either::Left(kind) => Some(MacroDefId {
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krate: Some(krate),
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ast_id: Some(ast_id),
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kind: MacroDefKind::BuiltIn(kind),
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local_inner: false,
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}),
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Either::Right(kind) => Some(MacroDefId {
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krate: Some(krate),
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ast_id: Some(ast_id),
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kind: MacroDefKind::BuiltInEager(kind),
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local_inner: false,
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}),
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}
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}
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register_builtin! {
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LAZY:
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(column, Column) => column_expand,
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(compile_error, CompileError) => compile_error_expand,
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(file, File) => file_expand,
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(line, Line) => line_expand,
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(assert, Assert) => assert_expand,
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(stringify, Stringify) => stringify_expand,
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(format_args, FormatArgs) => format_args_expand,
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// format_args_nl only differs in that it adds a newline in the end,
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// so we use the same stub expansion for now
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(format_args_nl, FormatArgsNl) => format_args_expand,
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EAGER:
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(concat, Concat) => concat_expand,
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(include, Include) => include_expand,
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(include_bytes, IncludeBytes) => include_bytes_expand,
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(include_str, IncludeStr) => include_str_expand,
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(env, Env) => env_expand,
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(option_env, OptionEnv) => option_env_expand
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}
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fn line_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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_tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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// dummy implementation for type-checking purposes
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let line_num = 0;
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let expanded = quote! {
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#line_num
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};
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Ok(expanded)
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}
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fn stringify_expand(
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db: &dyn AstDatabase,
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id: LazyMacroId,
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_tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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let loc = db.lookup_intern_macro(id);
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let macro_content = {
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let arg = loc.kind.arg(db).ok_or_else(|| mbe::ExpandError::UnexpectedToken)?;
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let macro_args = arg;
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let text = macro_args.text();
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let without_parens = TextSize::of('(')..text.len() - TextSize::of(')');
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text.slice(without_parens).to_string()
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};
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let expanded = quote! {
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#macro_content
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};
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Ok(expanded)
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}
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fn column_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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_tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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// dummy implementation for type-checking purposes
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let col_num = 0;
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let expanded = quote! {
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#col_num
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};
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Ok(expanded)
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}
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fn assert_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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// A hacky implementation for goto def and hover
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// We expand `assert!(cond, arg1, arg2)` to
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// ```
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// {(cond, &(arg1), &(arg2));}
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// ```,
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// which is wrong but useful.
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let mut args = Vec::new();
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let mut current = Vec::new();
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for tt in tt.token_trees.iter().cloned() {
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match tt {
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tt::TokenTree::Leaf(tt::Leaf::Punct(p)) if p.char == ',' => {
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args.push(current);
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current = Vec::new();
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}
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_ => {
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current.push(tt);
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}
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}
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}
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if !current.is_empty() {
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args.push(current);
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}
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let arg_tts = args.into_iter().flat_map(|arg| {
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quote! { &(##arg), }
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}.token_trees).collect::<Vec<_>>();
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let expanded = quote! {
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{ { (##arg_tts); } }
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};
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Ok(expanded)
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}
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fn file_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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_tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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// FIXME: RA purposefully lacks knowledge of absolute file names
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// so just return "".
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let file_name = "";
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let expanded = quote! {
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#file_name
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};
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Ok(expanded)
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}
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fn compile_error_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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if tt.count() == 1 {
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if let tt::TokenTree::Leaf(tt::Leaf::Literal(it)) = &tt.token_trees[0] {
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let s = it.text.as_str();
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if s.contains('"') {
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return Ok(quote! { loop { #it }});
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}
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};
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}
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Err(mbe::ExpandError::BindingError("Must be a string".into()))
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}
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fn format_args_expand(
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_db: &dyn AstDatabase,
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_id: LazyMacroId,
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tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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// We expand `format_args!("", a1, a2)` to
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// ```
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// std::fmt::Arguments::new_v1(&[], &[
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// std::fmt::ArgumentV1::new(&arg1,std::fmt::Display::fmt),
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// std::fmt::ArgumentV1::new(&arg2,std::fmt::Display::fmt),
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// ])
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// ```,
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// which is still not really correct, but close enough for now
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let mut args = Vec::new();
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let mut current = Vec::new();
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for tt in tt.token_trees.iter().cloned() {
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match tt {
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tt::TokenTree::Leaf(tt::Leaf::Punct(p)) if p.char == ',' => {
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args.push(current);
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current = Vec::new();
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}
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_ => {
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current.push(tt);
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}
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}
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}
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if !current.is_empty() {
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args.push(current);
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}
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if args.is_empty() {
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return Err(mbe::ExpandError::NoMatchingRule);
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}
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let _format_string = args.remove(0);
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let arg_tts = args.into_iter().flat_map(|arg| {
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quote! { std::fmt::ArgumentV1::new(&(##arg), std::fmt::Display::fmt), }
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}.token_trees).collect::<Vec<_>>();
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let expanded = quote! {
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std::fmt::Arguments::new_v1(&[], &[##arg_tts])
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};
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Ok(expanded)
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}
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fn unquote_str(lit: &tt::Literal) -> Option<String> {
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let lit = ast::make::tokens::literal(&lit.to_string());
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let token = ast::String::cast(lit)?;
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token.value().map(|it| it.into_owned())
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}
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fn concat_expand(
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_db: &dyn AstDatabase,
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_arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let mut text = String::new();
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for (i, t) in tt.token_trees.iter().enumerate() {
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match t {
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tt::TokenTree::Leaf(tt::Leaf::Literal(it)) if i % 2 == 0 => {
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text += &unquote_str(&it).ok_or_else(|| mbe::ExpandError::ConversionError)?;
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}
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tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if i % 2 == 1 && punct.char == ',' => (),
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_ => return Err(mbe::ExpandError::UnexpectedToken),
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}
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}
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Ok((quote!(#text), FragmentKind::Expr))
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}
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fn relative_file(
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db: &dyn AstDatabase,
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call_id: MacroCallId,
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path: &str,
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allow_recursion: bool,
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) -> Option<FileId> {
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let call_site = call_id.as_file().original_file(db);
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let res = db.resolve_path(call_site, path)?;
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// Prevent include itself
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if res == call_site && !allow_recursion {
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None
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} else {
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Some(res)
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}
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}
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fn parse_string(tt: &tt::Subtree) -> Result<String, mbe::ExpandError> {
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tt.token_trees
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.get(0)
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.and_then(|tt| match tt {
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tt::TokenTree::Leaf(tt::Leaf::Literal(it)) => unquote_str(&it),
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_ => None,
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})
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.ok_or_else(|| mbe::ExpandError::ConversionError)
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}
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fn include_expand(
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db: &dyn AstDatabase,
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arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let path = parse_string(tt)?;
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let file_id = relative_file(db, arg_id.into(), &path, false)
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.ok_or_else(|| mbe::ExpandError::ConversionError)?;
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// FIXME:
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// Handle include as expression
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let res = parse_to_token_tree(&db.file_text(file_id))
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.ok_or_else(|| mbe::ExpandError::ConversionError)?
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.0;
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Ok((res, FragmentKind::Items))
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}
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fn include_bytes_expand(
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_db: &dyn AstDatabase,
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_arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let _path = parse_string(tt)?;
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// FIXME: actually read the file here if the user asked for macro expansion
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let res = tt::Subtree {
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delimiter: None,
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token_trees: vec![tt::TokenTree::Leaf(tt::Leaf::Literal(tt::Literal {
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text: r#"b"""#.into(),
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id: tt::TokenId::unspecified(),
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}))],
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};
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Ok((res, FragmentKind::Expr))
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}
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fn include_str_expand(
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db: &dyn AstDatabase,
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arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let path = parse_string(tt)?;
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// FIXME: we're not able to read excluded files (which is most of them because
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// it's unusual to `include_str!` a Rust file), but we can return an empty string.
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// Ideally, we'd be able to offer a precise expansion if the user asks for macro
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// expansion.
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let file_id = match relative_file(db, arg_id.into(), &path, true) {
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Some(file_id) => file_id,
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None => {
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return Ok((quote!(""), FragmentKind::Expr));
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}
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};
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let text = db.file_text(file_id);
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let text = &*text;
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Ok((quote!(#text), FragmentKind::Expr))
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}
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fn get_env_inner(db: &dyn AstDatabase, arg_id: EagerMacroId, key: &str) -> Option<String> {
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let krate = db.lookup_intern_eager_expansion(arg_id).krate;
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db.crate_graph()[krate].env.get(key)
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}
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fn env_expand(
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db: &dyn AstDatabase,
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arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let key = parse_string(tt)?;
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// FIXME:
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// If the environment variable is not defined int rustc, then a compilation error will be emitted.
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// We might do the same if we fully support all other stuffs.
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// But for now on, we should return some dummy string for better type infer purpose.
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// However, we cannot use an empty string here, because for
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// `include!(concat!(env!("OUT_DIR"), "/foo.rs"))` will become
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// `include!("foo.rs"), which might go to infinite loop
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let s = get_env_inner(db, arg_id, &key).unwrap_or_else(|| "__RA_UNIMPLEMENTED__".to_string());
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let expanded = quote! { #s };
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Ok((expanded, FragmentKind::Expr))
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}
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fn option_env_expand(
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db: &dyn AstDatabase,
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arg_id: EagerMacroId,
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tt: &tt::Subtree,
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) -> Result<(tt::Subtree, FragmentKind), mbe::ExpandError> {
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let key = parse_string(tt)?;
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let expanded = match get_env_inner(db, arg_id, &key) {
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None => quote! { std::option::Option::None::<&str> },
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Some(s) => quote! { std::option::Some(#s) },
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};
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Ok((expanded, FragmentKind::Expr))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::{
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name::AsName, test_db::TestDB, AstNode, EagerCallLoc, MacroCallId, MacroCallKind,
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MacroCallLoc,
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};
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use ra_db::{fixture::WithFixture, SourceDatabase};
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use ra_syntax::ast::NameOwner;
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use std::sync::Arc;
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fn expand_builtin_macro(ra_fixture: &str) -> String {
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let (db, file_id) = TestDB::with_single_file(&ra_fixture);
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let parsed = db.parse(file_id);
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let macro_calls: Vec<_> =
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parsed.syntax_node().descendants().filter_map(ast::MacroCall::cast).collect();
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let ast_id_map = db.ast_id_map(file_id.into());
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let expander = find_by_name(¯o_calls[0].name().unwrap().as_name()).unwrap();
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let krate = CrateId(0);
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let file_id = match expander {
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Either::Left(expander) => {
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// the first one should be a macro_rules
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let def = MacroDefId {
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krate: Some(CrateId(0)),
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ast_id: Some(AstId::new(file_id.into(), ast_id_map.ast_id(¯o_calls[0]))),
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kind: MacroDefKind::BuiltIn(expander),
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local_inner: false,
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};
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let loc = MacroCallLoc {
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def,
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krate,
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kind: MacroCallKind::FnLike(AstId::new(
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file_id.into(),
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ast_id_map.ast_id(¯o_calls[1]),
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)),
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};
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let id: MacroCallId = db.intern_macro(loc).into();
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id.as_file()
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}
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Either::Right(expander) => {
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// the first one should be a macro_rules
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let def = MacroDefId {
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krate: Some(krate),
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ast_id: Some(AstId::new(file_id.into(), ast_id_map.ast_id(¯o_calls[0]))),
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kind: MacroDefKind::BuiltInEager(expander),
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local_inner: false,
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};
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let args = macro_calls[1].token_tree().unwrap();
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let parsed_args = mbe::ast_to_token_tree(&args).unwrap().0;
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let arg_id = db.intern_eager_expansion({
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EagerCallLoc {
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def,
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fragment: FragmentKind::Expr,
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subtree: Arc::new(parsed_args.clone()),
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krate,
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file_id: file_id.into(),
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}
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});
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let (subtree, fragment) = expander.expand(&db, arg_id, &parsed_args).unwrap();
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let eager = EagerCallLoc {
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def,
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fragment,
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subtree: Arc::new(subtree),
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krate,
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file_id: file_id.into(),
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};
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let id: MacroCallId = db.intern_eager_expansion(eager).into();
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id.as_file()
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}
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};
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db.parse_or_expand(file_id).unwrap().to_string()
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}
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|
|
#[test]
|
|
fn test_column_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! column {() => {}}
|
|
column!()
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "0");
|
|
}
|
|
|
|
#[test]
|
|
fn test_line_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! line {() => {}}
|
|
line!()
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "0");
|
|
}
|
|
|
|
#[test]
|
|
fn test_stringify_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! stringify {() => {}}
|
|
stringify!(a b c)
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "\"a b c\"");
|
|
}
|
|
|
|
#[test]
|
|
fn test_env_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! env {() => {}}
|
|
env!("TEST_ENV_VAR")
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "\"__RA_UNIMPLEMENTED__\"");
|
|
}
|
|
|
|
#[test]
|
|
fn test_option_env_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! option_env {() => {}}
|
|
option_env!("TEST_ENV_VAR")
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "std::option::Option::None:: < &str>");
|
|
}
|
|
|
|
#[test]
|
|
fn test_file_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! file {() => {}}
|
|
file!()
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "\"\"");
|
|
}
|
|
|
|
#[test]
|
|
fn test_assert_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! assert {
|
|
($cond:expr) => ({ /* compiler built-in */ });
|
|
($cond:expr, $($args:tt)*) => ({ /* compiler built-in */ })
|
|
}
|
|
assert!(true, "{} {:?}", arg1(a, b, c), arg2);
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, "{{(&(true), &(\"{} {:?}\"), &(arg1(a,b,c)), &(arg2),);}}");
|
|
}
|
|
|
|
#[test]
|
|
fn test_compile_error_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! compile_error {
|
|
($msg:expr) => ({ /* compiler built-in */ });
|
|
($msg:expr,) => ({ /* compiler built-in */ })
|
|
}
|
|
compile_error!("error!");
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, r#"loop{"error!"}"#);
|
|
}
|
|
|
|
#[test]
|
|
fn test_format_args_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! format_args {
|
|
($fmt:expr) => ({ /* compiler built-in */ });
|
|
($fmt:expr, $($args:tt)*) => ({ /* compiler built-in */ })
|
|
}
|
|
format_args!("{} {:?}", arg1(a, b, c), arg2);
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(
|
|
expanded,
|
|
r#"std::fmt::Arguments::new_v1(&[], &[std::fmt::ArgumentV1::new(&(arg1(a,b,c)),std::fmt::Display::fmt),std::fmt::ArgumentV1::new(&(arg2),std::fmt::Display::fmt),])"#
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_include_bytes_expand() {
|
|
let expanded = expand_builtin_macro(
|
|
r#"
|
|
#[rustc_builtin_macro]
|
|
macro_rules! include_bytes {
|
|
($file:expr) => {{ /* compiler built-in */ }};
|
|
($file:expr,) => {{ /* compiler built-in */ }};
|
|
}
|
|
include_bytes("foo");
|
|
"#,
|
|
);
|
|
|
|
assert_eq!(expanded, r#"b"""#);
|
|
}
|
|
}
|