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//! `ra_hir_expand` deals with macro expansion.
//!
//! Specifically, it implements a concept of `MacroFile` -- a file whose syntax
//! tree originates not from the text of some `FileId`, but from some macro
//! expansion.
pub mod db;
pub mod ast_id_map;
pub mod name;
pub mod hygiene;
pub mod diagnostics;
pub mod builtin_derive;
pub mod builtin_macro;
pub mod quote;
use std::hash::Hash;
use std::sync::Arc;
use ra_db::{salsa, CrateId, FileId};
use ra_syntax::{
algo,
ast::{self, AstNode},
SyntaxNode, SyntaxToken, TextUnit,
};
use crate::ast_id_map::FileAstId;
use crate::builtin_derive::BuiltinDeriveExpander;
use crate::builtin_macro::BuiltinFnLikeExpander;
#[cfg(test)]
mod test_db;
/// Input to the analyzer is a set of files, where each file is identified by
/// `FileId` and contains source code. However, another source of source code in
/// Rust are macros: each macro can be thought of as producing a "temporary
/// file". To assign an id to such a file, we use the id of the macro call that
/// produced the file. So, a `HirFileId` is either a `FileId` (source code
/// written by user), or a `MacroCallId` (source code produced by macro).
///
/// What is a `MacroCallId`? Simplifying, it's a `HirFileId` of a file
/// containing the call plus the offset of the macro call in the file. Note that
/// this is a recursive definition! However, the size_of of `HirFileId` is
/// finite (because everything bottoms out at the real `FileId`) and small
/// (`MacroCallId` uses the location interner).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct HirFileId(HirFileIdRepr);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
enum HirFileIdRepr {
FileId(FileId),
MacroFile(MacroFile),
}
impl From<FileId> for HirFileId {
fn from(id: FileId) -> Self {
HirFileId(HirFileIdRepr::FileId(id))
}
}
impl From<MacroFile> for HirFileId {
fn from(id: MacroFile) -> Self {
HirFileId(HirFileIdRepr::MacroFile(id))
}
}
impl HirFileId {
/// For macro-expansion files, returns the file original source file the
/// expansion originated from.
pub fn original_file(self, db: &dyn db::AstDatabase) -> FileId {
match self.0 {
HirFileIdRepr::FileId(file_id) => file_id,
HirFileIdRepr::MacroFile(macro_file) => {
let loc = db.lookup_intern_macro(macro_file.macro_call_id);
loc.kind.file_id().original_file(db)
}
}
}
/// If this is a macro call, returns the syntax node of the call.
pub fn call_node(self, db: &dyn db::AstDatabase) -> Option<InFile<SyntaxNode>> {
match self.0 {
HirFileIdRepr::FileId(_) => None,
HirFileIdRepr::MacroFile(macro_file) => {
let loc = db.lookup_intern_macro(macro_file.macro_call_id);
Some(loc.kind.node(db))
}
}
}
/// Return expansion information if it is a macro-expansion file
pub fn expansion_info(self, db: &dyn db::AstDatabase) -> Option<ExpansionInfo> {
match self.0 {
HirFileIdRepr::FileId(_) => None,
HirFileIdRepr::MacroFile(macro_file) => {
let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
let arg_tt = loc.kind.arg(db)?;
let def_tt = loc.def.ast_id?.to_node(db).token_tree()?;
let macro_def = db.macro_def(loc.def)?;
let (parse, exp_map) = db.parse_macro(macro_file)?;
let macro_arg = db.macro_arg(macro_file.macro_call_id)?;
Some(ExpansionInfo {
expanded: InFile::new(self, parse.syntax_node()),
arg: InFile::new(loc.kind.file_id(), arg_tt),
def: InFile::new(loc.def.ast_id?.file_id, def_tt),
macro_arg,
macro_def,
exp_map,
})
}
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroFile {
macro_call_id: MacroCallId,
macro_file_kind: MacroFileKind,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum MacroFileKind {
Items,
Expr,
Statements,
}
/// `MacroCallId` identifies a particular macro invocation, like
/// `println!("Hello, {}", world)`.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroCallId(salsa::InternId);
impl salsa::InternKey for MacroCallId {
fn from_intern_id(v: salsa::InternId) -> Self {
MacroCallId(v)
}
fn as_intern_id(&self) -> salsa::InternId {
self.0
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct MacroDefId {
// FIXME: krate and ast_id are currently optional because we don't have a
// definition location for built-in derives. There is one, though: the
// standard library defines them. The problem is that it uses the new
// `macro` syntax for this, which we don't support yet. As soon as we do
// (which will probably require touching this code), we can instead use
// that (and also remove the hacks for resolving built-in derives).
pub krate: Option<CrateId>,
pub ast_id: Option<AstId<ast::MacroCall>>,
pub kind: MacroDefKind,
}
impl MacroDefId {
pub fn as_call_id(self, db: &dyn db::AstDatabase, kind: MacroCallKind) -> MacroCallId {
db.intern_macro(MacroCallLoc { def: self, kind })
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum MacroDefKind {
Declarative,
BuiltIn(BuiltinFnLikeExpander),
// FIXME: maybe just Builtin and rename BuiltinFnLikeExpander to BuiltinExpander
BuiltInDerive(BuiltinDeriveExpander),
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MacroCallLoc {
pub(crate) def: MacroDefId,
pub(crate) kind: MacroCallKind,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum MacroCallKind {
FnLike(AstId<ast::MacroCall>),
Attr(AstId<ast::ModuleItem>),
}
impl MacroCallKind {
pub fn file_id(&self) -> HirFileId {
match self {
MacroCallKind::FnLike(ast_id) => ast_id.file_id,
MacroCallKind::Attr(ast_id) => ast_id.file_id,
}
}
pub fn node(&self, db: &dyn db::AstDatabase) -> InFile<SyntaxNode> {
match self {
MacroCallKind::FnLike(ast_id) => ast_id.with_value(ast_id.to_node(db).syntax().clone()),
MacroCallKind::Attr(ast_id) => ast_id.with_value(ast_id.to_node(db).syntax().clone()),
}
}
pub fn arg(&self, db: &dyn db::AstDatabase) -> Option<SyntaxNode> {
match self {
MacroCallKind::FnLike(ast_id) => {
Some(ast_id.to_node(db).token_tree()?.syntax().clone())
}
MacroCallKind::Attr(ast_id) => Some(ast_id.to_node(db).syntax().clone()),
}
}
}
impl MacroCallId {
pub fn as_file(self, kind: MacroFileKind) -> HirFileId {
let macro_file = MacroFile { macro_call_id: self, macro_file_kind: kind };
macro_file.into()
}
}
/// ExpansionInfo mainly describes how to map text range between src and expanded macro
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ExpansionInfo {
expanded: InFile<SyntaxNode>,
arg: InFile<SyntaxNode>,
def: InFile<ast::TokenTree>,
macro_def: Arc<(db::TokenExpander, mbe::TokenMap)>,
macro_arg: Arc<(tt::Subtree, mbe::TokenMap)>,
exp_map: Arc<mbe::TokenMap>,
}
impl ExpansionInfo {
pub fn map_token_down(&self, token: InFile<&SyntaxToken>) -> Option<InFile<SyntaxToken>> {
assert_eq!(token.file_id, self.arg.file_id);
let range = token.value.text_range().checked_sub(self.arg.value.text_range().start())?;
let token_id = self.macro_arg.1.token_by_range(range)?;
let token_id = self.macro_def.0.map_id_down(token_id);
let range = self.exp_map.range_by_token(token_id)?;
let token = algo::find_covering_element(&self.expanded.value, range).into_token()?;
Some(self.expanded.with_value(token))
}
pub fn map_token_up(&self, token: InFile<&SyntaxToken>) -> Option<InFile<SyntaxToken>> {
let token_id = self.exp_map.token_by_range(token.value.text_range())?;
let (token_id, origin) = self.macro_def.0.map_id_up(token_id);
let (token_map, tt) = match origin {
mbe::Origin::Call => (&self.macro_arg.1, self.arg.clone()),
mbe::Origin::Def => {
(&self.macro_def.1, self.def.as_ref().map(|tt| tt.syntax().clone()))
}
};
let range = token_map.range_by_token(token_id)?;
let token = algo::find_covering_element(&tt.value, range + tt.value.text_range().start())
.into_token()?;
Some(tt.with_value(token))
}
}
/// `AstId` points to an AST node in any file.
///
/// It is stable across reparses, and can be used as salsa key/value.
// FIXME: isn't this just a `Source<FileAstId<N>>` ?
pub type AstId<N> = InFile<FileAstId<N>>;
impl<N: AstNode> AstId<N> {
pub fn to_node(&self, db: &dyn db::AstDatabase) -> N {
let root = db.parse_or_expand(self.file_id).unwrap();
db.ast_id_map(self.file_id).get(self.value).to_node(&root)
}
}
/// `InFile<T>` stores a value of `T` inside a particular file/syntax tree.
///
/// Typical usages are:
///
/// * `InFile<SyntaxNode>` -- syntax node in a file
/// * `InFile<ast::FnDef>` -- ast node in a file
/// * `InFile<TextUnit>` -- offset in a file
#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
pub struct InFile<T> {
pub file_id: HirFileId,
pub value: T,
}
impl<T> InFile<T> {
pub fn new(file_id: HirFileId, value: T) -> InFile<T> {
InFile { file_id, value }
}
// Similarly, naming here is stupid...
pub fn with_value<U>(&self, value: U) -> InFile<U> {
InFile::new(self.file_id, value)
}
pub fn map<F: FnOnce(T) -> U, U>(self, f: F) -> InFile<U> {
InFile::new(self.file_id, f(self.value))
}
pub fn as_ref(&self) -> InFile<&T> {
self.with_value(&self.value)
}
pub fn file_syntax(&self, db: &impl db::AstDatabase) -> SyntaxNode {
db.parse_or_expand(self.file_id).expect("source created from invalid file")
}
}
|