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Downmap the token in attribute inputs when expanding speculatively

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This commit is contained in:
Lukas Wirth 2021-09-14 00:04:04 +02:00
parent 2b907652ee
commit aa1b36dc6d
4 changed files with 154 additions and 21 deletions
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34
crates/base_db/src/fixture.rs
View File

@ -258,12 +258,23 @@ fn test_proc_macros(proc_macros: &[String]) -> (Vec<ProcMacro>, String) {
pub fn identity(_attr: TokenStream, item: TokenStream) -> TokenStream {
item
}
#[proc_macro_attribute]
pub fn input_replace(attr: TokenStream, _item: TokenStream) -> TokenStream {
attr
}
"#;
let proc_macros = std::array::IntoIter::new([ProcMacro {
let proc_macros = std::array::IntoIter::new([
ProcMacro {
name: "identity".into(),
kind: crate::ProcMacroKind::Attr,
expander: Arc::new(IdentityProcMacroExpander),
}])
},
ProcMacro {
name: "input_replace".into(),
kind: crate::ProcMacroKind::Attr,
expander: Arc::new(AttributeInputReplaceProcMacroExpander),
},
])
.filter(|pm| proc_macros.iter().any(|name| name == &pm.name))
.collect();
(proc_macros, source.into())
@ -308,8 +319,9 @@ fn from(f: Fixture) -> FileMeta {
}
}
// Identity mapping
#[derive(Debug)]
pub struct IdentityProcMacroExpander;
struct IdentityProcMacroExpander;
impl ProcMacroExpander for IdentityProcMacroExpander {
fn expand(
&self,
@ -320,3 +332,19 @@ fn expand(
Ok(subtree.clone())
}
}
// Pastes the attribute input as its output
#[derive(Debug)]
struct AttributeInputReplaceProcMacroExpander;
impl ProcMacroExpander for AttributeInputReplaceProcMacroExpander {
fn expand(
&self,
_: &Subtree,
attrs: Option<&Subtree>,
_: &Env,
) -> Result<Subtree, ProcMacroExpansionError> {
attrs
.cloned()
.ok_or_else(|| ProcMacroExpansionError::Panic("Expected attribute input".into()))
}
}

60
crates/hir_expand/src/db.rs
View File

@ -5,7 +5,7 @@
use base_db::{salsa, SourceDatabase};
use itertools::Itertools;
use limit::Limit;
use mbe::{ExpandError, ExpandResult};
use mbe::{syntax_node_to_token_tree, ExpandError, ExpandResult};
use syntax::{
algo::diff,
ast::{self, AttrsOwner, NameOwner},
@ -146,24 +146,57 @@ pub fn expand_speculative(
) -> Option<(SyntaxNode, SyntaxToken)> {
let loc = db.lookup_intern_macro(actual_macro_call);
let macro_def = db.macro_def(loc.def)?;
let token_range = token_to_map.text_range();
// Fetch token id in the speculative args
// Build the subtree and token mapping for the speculative args
let censor = censor_for_macro_input(&loc, &speculative_args);
let (tt, args_tmap) = mbe::syntax_node_to_token_tree_censored(&speculative_args, censor);
let range = token_to_map.text_range().checked_sub(speculative_args.text_range().start())?;
let token_id = args_tmap.token_by_range(range)?;
let (mut tt, spec_args_tmap) =
mbe::syntax_node_to_token_tree_censored(&speculative_args, censor);
let speculative_expansion = if let MacroDefKind::ProcMacro(expander, ..) = loc.def.kind {
let attr_arg = match &loc.kind {
// FIXME make attr arg speculative as well
MacroCallKind::Attr { attr_args, .. } => {
let mut attr_args = attr_args.0.clone();
mbe::Shift::new(&tt).shift_all(&mut attr_args);
Some(attr_args)
let (attr_arg, token_id) = match loc.kind {
MacroCallKind::Attr { invoc_attr_index, .. } => {
// Attributes may have an input token tree, build the subtree and map for this as well
// then try finding a token id for our token if it is inside this input subtree.
let item = ast::Item::cast(speculative_args.clone())?;
let attr = item.attrs().nth(invoc_attr_index as usize)?;
match attr.token_tree() {
Some(token_tree) => {
let (mut tree, map) = syntax_node_to_token_tree(attr.token_tree()?.syntax());
tree.delimiter = None;
let shift = mbe::Shift::new(&tt);
shift.shift_all(&mut tree);
let token_id = if token_tree.syntax().text_range().contains_range(token_range) {
let attr_input_start =
token_tree.left_delimiter_token()?.text_range().start();
let range = token_range.checked_sub(attr_input_start)?;
let token_id = shift.shift(map.token_by_range(range)?);
Some(token_id)
} else {
None
};
(Some(tree), token_id)
}
_ => (None, None),
}
}
_ => (None, None),
};
let token_id = match token_id {
Some(token_id) => token_id,
// token wasn't inside an attribute input so it has to be in the general macro input
None => {
let range = token_range.checked_sub(speculative_args.text_range().start())?;
let token_id = spec_args_tmap.token_by_range(range)?;
macro_def.map_id_down(token_id)
}
_ => None,
};
// Do the actual expansion, we need to directly expand the proc macro due to the attribute args
// Otherwise the expand query will fetch the non speculative attribute args and pass those instead.
let speculative_expansion = if let MacroDefKind::ProcMacro(expander, ..) = loc.def.kind {
tt.delimiter = None;
expander.expand(db, loc.krate, &tt, attr_arg.as_ref())
} else {
macro_def.expand(db, actual_macro_call, &tt)
@ -173,7 +206,6 @@ pub fn expand_speculative(
let (node, rev_tmap) =
token_tree_to_syntax_node(&speculative_expansion.value, expand_to).ok()?;
let token_id = macro_def.map_id_down(token_id);
let range = rev_tmap.first_range_by_token(token_id, token_to_map.kind())?;
let token = node.syntax_node().covering_element(range).into_token()?;
Some((node.syntax_node(), token))

3
crates/ide_completion/src/context.rs
View File

@ -183,6 +183,7 @@ pub(super) fn new(
);
Some(ctx)
}
fn expand_and_fill(
&mut self,
mut original_file: SyntaxNode,
@ -191,6 +192,7 @@ fn expand_and_fill(
mut fake_ident_token: SyntaxToken,
) {
loop {
// Expand attributes
if let (Some(actual_item), Some(item_with_fake_ident)) = (
find_node_at_offset::<ast::Item>(&original_file, offset),
find_node_at_offset::<ast::Item>(&speculative_file, offset),
@ -219,6 +221,7 @@ fn expand_and_fill(
}
}
// Expand fn-like macro calls
if let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
find_node_at_offset::<ast::MacroCall>(&original_file, offset),
find_node_at_offset::<ast::MacroCall>(&speculative_file, offset),

70
crates/ide_completion/src/tests/proc_macros.rs
View File

@ -73,3 +73,73 @@ fn main() {
"#]],
)
}
#[test]
fn complete_dot_in_attr_input() {
check(
r#"
//- proc_macros: input_replace
pub struct Foo;
impl Foo {
fn foo(&self) {}
}
#[proc_macros::input_replace(
fn suprise() {
Foo.$0
}
)]
fn main() {}
"#,
expect![[r#"
me foo() fn(&self)
sn ref &expr
sn refm &mut expr
sn match match expr {}
sn box Box::new(expr)
sn ok Ok(expr)
sn err Err(expr)
sn some Some(expr)
sn dbg dbg!(expr)
sn dbgr dbg!(&expr)
sn call function(expr)
sn let let
sn letm let mut
"#]],
)
}
#[test]
fn complete_dot_in_attr_input2() {
check(
r#"
//- proc_macros: input_replace
pub struct Foo;
impl Foo {
fn foo(&self) {}
}
#[proc_macros::input_replace(
fn suprise() {
Foo.f$0
}
)]
fn main() {}
"#,
expect![[r#"
me foo() fn(&self)
sn ref &expr
sn refm &mut expr
sn match match expr {}
sn box Box::new(expr)
sn ok Ok(expr)
sn err Err(expr)
sn some Some(expr)
sn dbg dbg!(expr)
sn dbgr dbg!(&expr)
sn call function(expr)
sn let let
sn letm let mut
"#]],
)
}