159 lines
5.3 KiB
Rust
159 lines
5.3 KiB
Rust
//! Defines database & queries for macro expansion.
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use std::sync::Arc;
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use mbe::MacroRules;
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use ra_db::{salsa, SourceDatabase};
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use ra_parser::FragmentKind;
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use ra_prof::profile;
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use ra_syntax::{AstNode, Parse, SyntaxNode};
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use crate::{
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ast_id_map::AstIdMap, BuiltinFnLikeExpander, HirFileId, HirFileIdRepr, MacroCallId,
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MacroCallLoc, MacroDefId, MacroDefKind, MacroFile, MacroFileKind,
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};
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#[derive(Debug, Clone, Eq, PartialEq)]
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pub enum TokenExpander {
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MacroRules(mbe::MacroRules),
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Builtin(BuiltinFnLikeExpander),
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}
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impl TokenExpander {
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pub fn expand(
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&self,
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db: &dyn AstDatabase,
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id: MacroCallId,
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tt: &tt::Subtree,
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) -> Result<tt::Subtree, mbe::ExpandError> {
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match self {
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TokenExpander::MacroRules(it) => it.expand(tt),
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TokenExpander::Builtin(it) => it.expand(db, id, tt),
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}
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}
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pub fn map_id_down(&self, id: tt::TokenId) -> tt::TokenId {
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match self {
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TokenExpander::MacroRules(it) => it.map_id_down(id),
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TokenExpander::Builtin(..) => id,
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}
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}
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pub fn map_id_up(&self, id: tt::TokenId) -> (tt::TokenId, mbe::Origin) {
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match self {
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TokenExpander::MacroRules(it) => it.map_id_up(id),
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TokenExpander::Builtin(..) => (id, mbe::Origin::Def),
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}
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}
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}
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// FIXME: rename to ExpandDatabase
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#[salsa::query_group(AstDatabaseStorage)]
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pub trait AstDatabase: SourceDatabase {
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fn ast_id_map(&self, file_id: HirFileId) -> Arc<AstIdMap>;
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#[salsa::transparent]
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fn parse_or_expand(&self, file_id: HirFileId) -> Option<SyntaxNode>;
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#[salsa::interned]
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fn intern_macro(&self, macro_call: MacroCallLoc) -> MacroCallId;
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fn macro_arg(&self, id: MacroCallId) -> Option<Arc<(tt::Subtree, mbe::TokenMap)>>;
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fn macro_def(&self, id: MacroDefId) -> Option<Arc<(TokenExpander, mbe::TokenMap)>>;
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fn parse_macro(&self, macro_file: MacroFile)
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-> Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)>;
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fn macro_expand(&self, macro_call: MacroCallId) -> Result<Arc<tt::Subtree>, String>;
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}
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pub(crate) fn ast_id_map(db: &dyn AstDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
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let map =
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db.parse_or_expand(file_id).map_or_else(AstIdMap::default, |it| AstIdMap::from_source(&it));
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Arc::new(map)
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}
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pub(crate) fn macro_def(
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db: &dyn AstDatabase,
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id: MacroDefId,
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) -> Option<Arc<(TokenExpander, mbe::TokenMap)>> {
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match id.kind {
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MacroDefKind::Declarative => {
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let macro_call = id.ast_id.to_node(db);
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let arg = macro_call.token_tree()?;
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let (tt, tmap) = mbe::ast_to_token_tree(&arg).or_else(|| {
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log::warn!("fail on macro_def to token tree: {:#?}", arg);
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None
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})?;
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let rules = MacroRules::parse(&tt).ok().or_else(|| {
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log::warn!("fail on macro_def parse: {:#?}", tt);
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None
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})?;
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Some(Arc::new((TokenExpander::MacroRules(rules), tmap)))
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}
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MacroDefKind::BuiltIn(expander) => {
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Some(Arc::new((TokenExpander::Builtin(expander.clone()), mbe::TokenMap::default())))
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}
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}
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}
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pub(crate) fn macro_arg(
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db: &dyn AstDatabase,
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id: MacroCallId,
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) -> Option<Arc<(tt::Subtree, mbe::TokenMap)>> {
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let loc = db.lookup_intern_macro(id);
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let macro_call = loc.ast_id.to_node(db);
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let arg = macro_call.token_tree()?;
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let (tt, tmap) = mbe::ast_to_token_tree(&arg)?;
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Some(Arc::new((tt, tmap)))
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}
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pub(crate) fn macro_expand(
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db: &dyn AstDatabase,
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id: MacroCallId,
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) -> Result<Arc<tt::Subtree>, String> {
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let loc = db.lookup_intern_macro(id);
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let macro_arg = db.macro_arg(id).ok_or("Fail to args in to tt::TokenTree")?;
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let macro_rules = db.macro_def(loc.def).ok_or("Fail to find macro definition")?;
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let tt = macro_rules.0.expand(db, id, ¯o_arg.0).map_err(|err| format!("{:?}", err))?;
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// Set a hard limit for the expanded tt
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let count = tt.count();
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if count > 65536 {
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return Err(format!("Total tokens count exceed limit : count = {}", count));
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}
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Ok(Arc::new(tt))
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}
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pub(crate) fn parse_or_expand(db: &dyn AstDatabase, file_id: HirFileId) -> Option<SyntaxNode> {
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match file_id.0 {
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HirFileIdRepr::FileId(file_id) => Some(db.parse(file_id).tree().syntax().clone()),
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HirFileIdRepr::MacroFile(macro_file) => {
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db.parse_macro(macro_file).map(|(it, _)| it.syntax_node())
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}
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}
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}
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pub(crate) fn parse_macro(
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db: &dyn AstDatabase,
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macro_file: MacroFile,
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) -> Option<(Parse<SyntaxNode>, Arc<mbe::TokenMap>)> {
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let _p = profile("parse_macro_query");
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let macro_call_id = macro_file.macro_call_id;
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let tt = db
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.macro_expand(macro_call_id)
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.map_err(|err| {
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// Note:
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// The final goal we would like to make all parse_macro success,
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// such that the following log will not call anyway.
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log::warn!("fail on macro_parse: (reason: {})", err,);
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})
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.ok()?;
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let fragment_kind = match macro_file.macro_file_kind {
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MacroFileKind::Items => FragmentKind::Items,
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MacroFileKind::Expr => FragmentKind::Expr,
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MacroFileKind::Statements => FragmentKind::Statements,
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};
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let (parse, rev_token_map) = mbe::token_tree_to_syntax_node(&tt, fragment_kind).ok()?;
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Some((parse, Arc::new(rev_token_map)))
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}
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