use base_db::ProcMacroKind;
use either::Either;
-pub use mbe::{ExpandError, ExpandResult};
+pub use mbe::{ExpandError, ExpandResult, Origin};
use std::{hash::Hash, iter, sync::Arc};
match self.0 {
HirFileIdRepr::FileId(file_id) => file_id,
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
let file_id = match &loc.eager {
Some(EagerCallInfo { included_file: Some(file), .. }) => (*file).into(),
_ => loc.kind.file_id(),
let mut level = 0;
let mut curr = self;
while let HirFileIdRepr::MacroFile(macro_file) = curr.0 {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
level += 1;
curr = loc.kind.file_id();
match self.0 {
HirFileIdRepr::FileId(_) => None,
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
Some(loc.kind.to_node(db))
}
}
match self.0 {
HirFileIdRepr::FileId(_) => None,
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
let arg_tt = loc.kind.arg(db)?;
match self.0 {
HirFileIdRepr::FileId(_) => None,
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
let item = match loc.def.kind {
MacroDefKind::BuiltInDerive(..) => loc.kind.to_node(db),
_ => return None,
match self.0 {
HirFileIdRepr::FileId(_) => false,
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
match loc.def.kind {
MacroDefKind::ProcMacro(_, ProcMacroKind::CustomDerive, _) => true,
_ => false,
pub fn is_include_macro(&self, db: &dyn db::AstDatabase) -> bool {
match self.0 {
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
matches!(loc.eager, Some(EagerCallInfo { included_file: Some(_), .. }))
}
_ => false,
pub fn is_attr_macro(&self, db: &dyn db::AstDatabase) -> bool {
match self.0 {
HirFileIdRepr::MacroFile(macro_file) => {
- let loc: MacroCallLoc = db.lookup_intern_macro(macro_file.macro_call_id);
+ let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
matches!(loc.kind, MacroCallKind::Attr { .. })
}
_ => false,
pub fn is_macro(self) -> bool {
matches!(self.0, HirFileIdRepr::MacroFile(_))
}
+
+ pub fn macro_file(self) -> Option<MacroFile> {
+ match self.0 {
+ HirFileIdRepr::FileId(_) => None,
+ HirFileIdRepr::MacroFile(m) => Some(m),
+ }
+ }
}
impl MacroDefId {
krate: CrateId,
kind: MacroCallKind,
) -> MacroCallId {
- db.intern_macro(MacroCallLoc { def: self, krate, eager: None, kind })
+ db.intern_macro_call(MacroCallLoc { def: self, krate, eager: None, kind })
}
pub fn ast_id(&self) -> Either<AstId<ast::Macro>, AstId<ast::Fn>> {
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ExpansionInfo {
expanded: InFile<SyntaxNode>,
+ /// The argument TokenTree or item for attributes
arg: InFile<SyntaxNode>,
- /// The `macro_rules!` arguments or attribute input.
+ /// The `macro_rules!` or attribute input.
attr_input_or_mac_def: Option<InFile<ast::TokenTree>>,
macro_def: Arc<TokenExpander>,
macro_arg: Arc<(tt::Subtree, mbe::TokenMap)>,
+ /// A shift built from `macro_arg`'s subtree, relevant for attributes as the item is the macro arg
+ /// and as such we need to shift tokens if they are part of an attributes input instead of their item.
macro_arg_shift: mbe::Shift,
exp_map: Arc<mbe::TokenMap>,
}
-pub use mbe::Origin;
-
impl ExpansionInfo {
+ pub fn expanded(&self) -> InFile<SyntaxNode> {
+ self.expanded.clone()
+ }
+
pub fn call_node(&self) -> Option<InFile<SyntaxNode>> {
Some(self.arg.with_value(self.arg.value.parent()?))
}
+ /// Map a token down from macro input into the macro expansion.
+ ///
+ /// The inner workings of this function differ slightly depending on the type of macro we are dealing with:
+ /// - declarative:
+ /// For declarative macros, we need to accommodate for the macro definition site(which acts as a second unchanging input)
+ /// , as tokens can mapped in and out of it.
+ /// To do this we shift all ids in the expansion by the maximum id of the definition site giving us an easy
+ /// way to map all the tokens.
+ /// - attribute:
+ /// Attributes have two different inputs, the input tokentree in the attribute node and the item
+ /// the attribute is annotating. Similarly as for declarative macros we need to do a shift here
+ /// as well. Currently this is done by shifting the attribute input by the maximum id of the item.
+ /// - function-like and derives:
+ /// Both of these only have one simple call site input so no special handling is required here.
pub fn map_token_down(
&self,
db: &dyn db::AstDatabase,
token: InFile<&SyntaxToken>,
) -> Option<impl Iterator<Item = InFile<SyntaxToken>> + '_> {
assert_eq!(token.file_id, self.arg.file_id);
- let token_id = if let Some(item) = item {
+ let token_id_in_attr_input = if let Some(item) = item {
// check if we are mapping down in an attribute input
- let call_id = match self.expanded.file_id.0 {
- HirFileIdRepr::FileId(_) => return None,
- HirFileIdRepr::MacroFile(macro_file) => macro_file.macro_call_id,
- };
- let loc = db.lookup_intern_macro(call_id);
+ // this is a special case as attributes can have two inputs
+ let call_id = self.expanded.file_id.macro_file()?.macro_call_id;
+ let loc = db.lookup_intern_macro_call(call_id);
let token_range = token.value.text_range();
match &loc.kind {
{
let attr_input_start =
token_tree.left_delimiter_token()?.text_range().start();
- let range = token.value.text_range().checked_sub(attr_input_start)?;
- let token_id =
- self.macro_arg_shift.shift(attr_args.1.token_by_range(range)?);
+ let relative_range =
+ token.value.text_range().checked_sub(attr_input_start)?;
+ // shift by the item's tree's max id
+ let token_id = self
+ .macro_arg_shift
+ .shift(attr_args.1.token_by_range(relative_range)?);
Some(token_id)
}
_ => None,
None
};
- let token_id = match token_id {
+ let token_id = match token_id_in_attr_input {
Some(token_id) => token_id,
+ // the token is not inside an attribute's input so do the lookup in the macro_arg as ususal
None => {
- let range =
+ let relative_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_arg.1.token_by_range(relative_range)?;
+ // conditionally shift the id by a declaratives macro definition
self.macro_def.map_id_down(token_id)
}
};
Some(tokens.map(move |token| self.expanded.with_value(token)))
}
+ /// Map a token up out of the expansion it resides in into the arguments of the macro call of the expansion.
pub fn map_token_up(
&self,
db: &dyn db::AstDatabase,
token: InFile<&SyntaxToken>,
) -> Option<(InFile<SyntaxToken>, Origin)> {
+ // Fetch the id through its text range,
let token_id = self.exp_map.token_by_range(token.value.text_range())?;
+ // conditionally unshifting the id to accommodate for macro-rules def site
let (mut token_id, origin) = self.macro_def.map_id_up(token_id);
- let call_id = match self.expanded.file_id.0 {
- HirFileIdRepr::FileId(_) => return None,
- HirFileIdRepr::MacroFile(macro_file) => macro_file.macro_call_id,
- };
- let loc = db.lookup_intern_macro(call_id);
+ let call_id = self.expanded.file_id.macro_file()?.macro_call_id;
+ let loc = db.lookup_intern_macro_call(call_id);
+ // Attributes are a bit special for us, they have two inputs, the input tokentree and the annotated item.
let (token_map, tt) = match &loc.kind {
- MacroCallKind::Attr { attr_args, .. } => match self.macro_arg_shift.unshift(token_id) {
- Some(unshifted) => {
- token_id = unshifted;
- (&attr_args.1, self.attr_input_or_mac_def.clone()?.syntax().cloned())
+ MacroCallKind::Attr { attr_args: (_, arg_token_map), .. } => {
+ // try unshifting the the token id, if unshifting fails, the token resides in the non-item attribute input
+ // note that the `TokenExpander::map_id_up` earlier only unshifts for declarative macros, so we don't double unshift with this
+ match self.macro_arg_shift.unshift(token_id) {
+ Some(unshifted) => {
+ token_id = unshifted;
+ (arg_token_map, self.attr_input_or_mac_def.clone()?.syntax().cloned())
+ }
+ None => (&self.macro_arg.1, self.arg.clone()),
}
- None => (&self.macro_arg.1, self.arg.clone()),
- },
+ }
_ => match origin {
mbe::Origin::Call => (&self.macro_arg.1, self.arg.clone()),
mbe::Origin::Def => match (&*self.macro_def, &self.attr_input_or_mac_def) {
pub fn syntax(&self) -> InFile<&SyntaxNode> {
self.with_value(self.value.syntax())
}
-
- pub fn nodes_with_attributes<'db>(
- self,
- db: &'db dyn db::AstDatabase,
- ) -> impl Iterator<Item = InFile<N>> + 'db
- where
- N: 'db,
- {
- iter::successors(Some(self), move |node| {
- let InFile { file_id, value } = node.file_id.call_node(db)?;
- N::cast(value).map(|n| InFile::new(file_id, n))
- })
- }
-
- pub fn node_with_attributes(self, db: &dyn db::AstDatabase) -> InFile<N> {
- self.nodes_with_attributes(db).last().unwrap()
- }
}
/// In Rust, macros expand token trees to token trees. When we want to turn a