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-rw-r--r--crates/ra_hir_def/src/body.rs142
-rw-r--r--crates/ra_hir_def/src/body/lower.rs590
2 files changed, 730 insertions, 2 deletions
diff --git a/crates/ra_hir_def/src/body.rs b/crates/ra_hir_def/src/body.rs
index 7447904ea..ac8f8261b 100644
--- a/crates/ra_hir_def/src/body.rs
+++ b/crates/ra_hir_def/src/body.rs
@@ -1,2 +1,144 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2mod lower; 2mod lower;
3
4use std::{ops::Index, sync::Arc};
5
6use hir_expand::{either::Either, HirFileId, MacroDefId, Source};
7use ra_arena::{map::ArenaMap, Arena};
8use ra_syntax::{ast, AstPtr};
9use rustc_hash::FxHashMap;
10
11use crate::{
12 db::DefDatabase2,
13 expr::{Expr, ExprId, Pat, PatId},
14 nameres::CrateDefMap,
15 path::Path,
16 ModuleId,
17};
18
19pub struct MacroResolver {
20 crate_def_map: Arc<CrateDefMap>,
21 module: ModuleId,
22}
23
24impl MacroResolver {
25 pub fn new(db: &impl DefDatabase2, module: ModuleId) -> MacroResolver {
26 MacroResolver { crate_def_map: db.crate_def_map(module.krate), module }
27 }
28
29 pub(crate) fn resolve_path_as_macro(
30 &self,
31 db: &impl DefDatabase2,
32 path: &Path,
33 ) -> Option<MacroDefId> {
34 self.crate_def_map.resolve_path(db, self.module.module_id, path).0.get_macros()
35 }
36}
37
38/// The body of an item (function, const etc.).
39#[derive(Debug, Eq, PartialEq)]
40pub struct Body {
41 exprs: Arena<ExprId, Expr>,
42 pats: Arena<PatId, Pat>,
43 /// The patterns for the function's parameters. While the parameter types are
44 /// part of the function signature, the patterns are not (they don't change
45 /// the external type of the function).
46 ///
47 /// If this `Body` is for the body of a constant, this will just be
48 /// empty.
49 params: Vec<PatId>,
50 /// The `ExprId` of the actual body expression.
51 body_expr: ExprId,
52}
53
54pub type ExprPtr = Either<AstPtr<ast::Expr>, AstPtr<ast::RecordField>>;
55pub type ExprSource = Source<ExprPtr>;
56
57pub type PatPtr = Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>>;
58pub type PatSource = Source<PatPtr>;
59
60/// An item body together with the mapping from syntax nodes to HIR expression
61/// IDs. This is needed to go from e.g. a position in a file to the HIR
62/// expression containing it; but for type inference etc., we want to operate on
63/// a structure that is agnostic to the actual positions of expressions in the
64/// file, so that we don't recompute types whenever some whitespace is typed.
65///
66/// One complication here is that, due to macro expansion, a single `Body` might
67/// be spread across several files. So, for each ExprId and PatId, we record
68/// both the HirFileId and the position inside the file. However, we only store
69/// AST -> ExprId mapping for non-macro files, as it is not clear how to handle
70/// this properly for macros.
71#[derive(Default, Debug, Eq, PartialEq)]
72pub struct BodySourceMap {
73 expr_map: FxHashMap<ExprPtr, ExprId>,
74 expr_map_back: ArenaMap<ExprId, ExprSource>,
75 pat_map: FxHashMap<PatPtr, PatId>,
76 pat_map_back: ArenaMap<PatId, PatSource>,
77 field_map: FxHashMap<(ExprId, usize), AstPtr<ast::RecordField>>,
78}
79
80impl Body {
81 pub fn new(
82 db: &impl DefDatabase2,
83 resolver: MacroResolver,
84 file_id: HirFileId,
85 params: Option<ast::ParamList>,
86 body: Option<ast::Expr>,
87 ) -> (Body, BodySourceMap) {
88 lower::lower(db, resolver, file_id, params, body)
89 }
90
91 pub fn params(&self) -> &[PatId] {
92 &self.params
93 }
94
95 pub fn body_expr(&self) -> ExprId {
96 self.body_expr
97 }
98
99 pub fn exprs(&self) -> impl Iterator<Item = (ExprId, &Expr)> {
100 self.exprs.iter()
101 }
102
103 pub fn pats(&self) -> impl Iterator<Item = (PatId, &Pat)> {
104 self.pats.iter()
105 }
106}
107
108impl Index<ExprId> for Body {
109 type Output = Expr;
110
111 fn index(&self, expr: ExprId) -> &Expr {
112 &self.exprs[expr]
113 }
114}
115
116impl Index<PatId> for Body {
117 type Output = Pat;
118
119 fn index(&self, pat: PatId) -> &Pat {
120 &self.pats[pat]
121 }
122}
123
124impl BodySourceMap {
125 pub fn expr_syntax(&self, expr: ExprId) -> Option<ExprSource> {
126 self.expr_map_back.get(expr).copied()
127 }
128
129 pub fn node_expr(&self, node: &ast::Expr) -> Option<ExprId> {
130 self.expr_map.get(&Either::A(AstPtr::new(node))).cloned()
131 }
132
133 pub fn pat_syntax(&self, pat: PatId) -> Option<PatSource> {
134 self.pat_map_back.get(pat).copied()
135 }
136
137 pub fn node_pat(&self, node: &ast::Pat) -> Option<PatId> {
138 self.pat_map.get(&Either::A(AstPtr::new(node))).cloned()
139 }
140
141 pub fn field_syntax(&self, expr: ExprId, field: usize) -> AstPtr<ast::RecordField> {
142 self.field_map[&(expr, field)]
143 }
144}
diff --git a/crates/ra_hir_def/src/body/lower.rs b/crates/ra_hir_def/src/body/lower.rs
index 1a144b1f9..1f93260d6 100644
--- a/crates/ra_hir_def/src/body/lower.rs
+++ b/crates/ra_hir_def/src/body/lower.rs
@@ -1,8 +1,594 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2 2
3use ra_syntax::ast; 3use hir_expand::{
4 either::Either,
5 hygiene::Hygiene,
6 name::{self, AsName, Name},
7 AstId, HirFileId, MacroCallLoc, MacroFileKind, Source,
8};
9use ra_arena::Arena;
10use ra_syntax::{
11 ast::{
12 self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner,
13 TypeAscriptionOwner,
14 },
15 AstNode, AstPtr,
16};
4 17
5use crate::expr::{ArithOp, BinaryOp, CmpOp, LogicOp, Ordering}; 18use crate::{
19 body::{Body, BodySourceMap, MacroResolver, PatPtr},
20 builtin_type::{BuiltinFloat, BuiltinInt},
21 db::DefDatabase2,
22 expr::{
23 ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp,
24 MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement,
25 },
26 path::GenericArgs,
27 path::Path,
28 type_ref::{Mutability, TypeRef},
29};
30
31pub(super) fn lower(
32 db: &impl DefDatabase2,
33 resolver: MacroResolver,
34 file_id: HirFileId,
35 params: Option<ast::ParamList>,
36 body: Option<ast::Expr>,
37) -> (Body, BodySourceMap) {
38 ExprCollector {
39 resolver,
40 db,
41 original_file_id: file_id,
42 current_file_id: file_id,
43 source_map: BodySourceMap::default(),
44 body: Body {
45 exprs: Arena::default(),
46 pats: Arena::default(),
47 params: Vec::new(),
48 body_expr: ExprId::dummy(),
49 },
50 }
51 .collect(params, body)
52}
53
54struct ExprCollector<DB> {
55 db: DB,
56 resolver: MacroResolver,
57 // Expr collector expands macros along the way. original points to the file
58 // we started with, current points to the current macro expansion. source
59 // maps don't support macros yet, so we only record info into source map if
60 // current == original (see #1196)
61 original_file_id: HirFileId,
62 current_file_id: HirFileId,
63
64 body: Body,
65 source_map: BodySourceMap,
66}
67
68impl<'a, DB> ExprCollector<&'a DB>
69where
70 DB: DefDatabase2,
71{
72 fn collect(
73 mut self,
74 param_list: Option<ast::ParamList>,
75 body: Option<ast::Expr>,
76 ) -> (Body, BodySourceMap) {
77 if let Some(param_list) = param_list {
78 if let Some(self_param) = param_list.self_param() {
79 let ptr = AstPtr::new(&self_param);
80 let param_pat = self.alloc_pat(
81 Pat::Bind {
82 name: name::SELF_PARAM,
83 mode: BindingAnnotation::Unannotated,
84 subpat: None,
85 },
86 Either::B(ptr),
87 );
88 self.body.params.push(param_pat);
89 }
90
91 for param in param_list.params() {
92 let pat = match param.pat() {
93 None => continue,
94 Some(pat) => pat,
95 };
96 let param_pat = self.collect_pat(pat);
97 self.body.params.push(param_pat);
98 }
99 };
100
101 self.body.body_expr = self.collect_expr_opt(body);
102 (self.body, self.source_map)
103 }
104
105 fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
106 let ptr = Either::A(ptr);
107 let id = self.body.exprs.alloc(expr);
108 if self.current_file_id == self.original_file_id {
109 self.source_map.expr_map.insert(ptr, id);
110 }
111 self.source_map
112 .expr_map_back
113 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
114 id
115 }
116 // desugared exprs don't have ptr, that's wrong and should be fixed
117 // somehow.
118 fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId {
119 self.body.exprs.alloc(expr)
120 }
121 fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr<ast::RecordField>) -> ExprId {
122 let ptr = Either::B(ptr);
123 let id = self.body.exprs.alloc(expr);
124 if self.current_file_id == self.original_file_id {
125 self.source_map.expr_map.insert(ptr, id);
126 }
127 self.source_map
128 .expr_map_back
129 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
130 id
131 }
132 fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId {
133 let id = self.body.pats.alloc(pat);
134 if self.current_file_id == self.original_file_id {
135 self.source_map.pat_map.insert(ptr, id);
136 }
137 self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr });
138 id
139 }
140
141 fn empty_block(&mut self) -> ExprId {
142 let block = Expr::Block { statements: Vec::new(), tail: None };
143 self.body.exprs.alloc(block)
144 }
145
146 fn missing_expr(&mut self) -> ExprId {
147 self.body.exprs.alloc(Expr::Missing)
148 }
149
150 fn missing_pat(&mut self) -> PatId {
151 self.body.pats.alloc(Pat::Missing)
152 }
153
154 fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
155 let syntax_ptr = AstPtr::new(&expr);
156 match expr {
157 ast::Expr::IfExpr(e) => {
158 let then_branch = self.collect_block_opt(e.then_branch());
159
160 let else_branch = e.else_branch().map(|b| match b {
161 ast::ElseBranch::Block(it) => self.collect_block(it),
162 ast::ElseBranch::IfExpr(elif) => {
163 let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap();
164 self.collect_expr(expr)
165 }
166 });
167
168 let condition = match e.condition() {
169 None => self.missing_expr(),
170 Some(condition) => match condition.pat() {
171 None => self.collect_expr_opt(condition.expr()),
172 // if let -- desugar to match
173 Some(pat) => {
174 let pat = self.collect_pat(pat);
175 let match_expr = self.collect_expr_opt(condition.expr());
176 let placeholder_pat = self.missing_pat();
177 let arms = vec![
178 MatchArm { pats: vec![pat], expr: then_branch, guard: None },
179 MatchArm {
180 pats: vec![placeholder_pat],
181 expr: else_branch.unwrap_or_else(|| self.empty_block()),
182 guard: None,
183 },
184 ];
185 return self
186 .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr);
187 }
188 },
189 };
190
191 self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
192 }
193 ast::Expr::TryBlockExpr(e) => {
194 let body = self.collect_block_opt(e.body());
195 self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
196 }
197 ast::Expr::BlockExpr(e) => self.collect_block(e),
198 ast::Expr::LoopExpr(e) => {
199 let body = self.collect_block_opt(e.loop_body());
200 self.alloc_expr(Expr::Loop { body }, syntax_ptr)
201 }
202 ast::Expr::WhileExpr(e) => {
203 let body = self.collect_block_opt(e.loop_body());
204
205 let condition = match e.condition() {
206 None => self.missing_expr(),
207 Some(condition) => match condition.pat() {
208 None => self.collect_expr_opt(condition.expr()),
209 // if let -- desugar to match
210 Some(pat) => {
211 let pat = self.collect_pat(pat);
212 let match_expr = self.collect_expr_opt(condition.expr());
213 let placeholder_pat = self.missing_pat();
214 let break_ = self.alloc_expr_desugared(Expr::Break { expr: None });
215 let arms = vec![
216 MatchArm { pats: vec![pat], expr: body, guard: None },
217 MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None },
218 ];
219 let match_expr =
220 self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms });
221 return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr);
222 }
223 },
224 };
225
226 self.alloc_expr(Expr::While { condition, body }, syntax_ptr)
227 }
228 ast::Expr::ForExpr(e) => {
229 let iterable = self.collect_expr_opt(e.iterable());
230 let pat = self.collect_pat_opt(e.pat());
231 let body = self.collect_block_opt(e.loop_body());
232 self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr)
233 }
234 ast::Expr::CallExpr(e) => {
235 let callee = self.collect_expr_opt(e.expr());
236 let args = if let Some(arg_list) = e.arg_list() {
237 arg_list.args().map(|e| self.collect_expr(e)).collect()
238 } else {
239 Vec::new()
240 };
241 self.alloc_expr(Expr::Call { callee, args }, syntax_ptr)
242 }
243 ast::Expr::MethodCallExpr(e) => {
244 let receiver = self.collect_expr_opt(e.expr());
245 let args = if let Some(arg_list) = e.arg_list() {
246 arg_list.args().map(|e| self.collect_expr(e)).collect()
247 } else {
248 Vec::new()
249 };
250 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
251 let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast);
252 self.alloc_expr(
253 Expr::MethodCall { receiver, method_name, args, generic_args },
254 syntax_ptr,
255 )
256 }
257 ast::Expr::MatchExpr(e) => {
258 let expr = self.collect_expr_opt(e.expr());
259 let arms = if let Some(match_arm_list) = e.match_arm_list() {
260 match_arm_list
261 .arms()
262 .map(|arm| MatchArm {
263 pats: arm.pats().map(|p| self.collect_pat(p)).collect(),
264 expr: self.collect_expr_opt(arm.expr()),
265 guard: arm
266 .guard()
267 .and_then(|guard| guard.expr())
268 .map(|e| self.collect_expr(e)),
269 })
270 .collect()
271 } else {
272 Vec::new()
273 };
274 self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr)
275 }
276 ast::Expr::PathExpr(e) => {
277 let path = e
278 .path()
279 .and_then(|path| self.parse_path(path))
280 .map(Expr::Path)
281 .unwrap_or(Expr::Missing);
282 self.alloc_expr(path, syntax_ptr)
283 }
284 ast::Expr::ContinueExpr(_e) => {
285 // FIXME: labels
286 self.alloc_expr(Expr::Continue, syntax_ptr)
287 }
288 ast::Expr::BreakExpr(e) => {
289 let expr = e.expr().map(|e| self.collect_expr(e));
290 self.alloc_expr(Expr::Break { expr }, syntax_ptr)
291 }
292 ast::Expr::ParenExpr(e) => {
293 let inner = self.collect_expr_opt(e.expr());
294 // make the paren expr point to the inner expression as well
295 self.source_map.expr_map.insert(Either::A(syntax_ptr), inner);
296 inner
297 }
298 ast::Expr::ReturnExpr(e) => {
299 let expr = e.expr().map(|e| self.collect_expr(e));
300 self.alloc_expr(Expr::Return { expr }, syntax_ptr)
301 }
302 ast::Expr::RecordLit(e) => {
303 let path = e.path().and_then(|path| self.parse_path(path));
304 let mut field_ptrs = Vec::new();
305 let record_lit = if let Some(nfl) = e.record_field_list() {
306 let fields = nfl
307 .fields()
308 .inspect(|field| field_ptrs.push(AstPtr::new(field)))
309 .map(|field| RecordLitField {
310 name: field
311 .name_ref()
312 .map(|nr| nr.as_name())
313 .unwrap_or_else(Name::missing),
314 expr: if let Some(e) = field.expr() {
315 self.collect_expr(e)
316 } else if let Some(nr) = field.name_ref() {
317 // field shorthand
318 self.alloc_expr_field_shorthand(
319 Expr::Path(Path::from_name_ref(&nr)),
320 AstPtr::new(&field),
321 )
322 } else {
323 self.missing_expr()
324 },
325 })
326 .collect();
327 let spread = nfl.spread().map(|s| self.collect_expr(s));
328 Expr::RecordLit { path, fields, spread }
329 } else {
330 Expr::RecordLit { path, fields: Vec::new(), spread: None }
331 };
332
333 let res = self.alloc_expr(record_lit, syntax_ptr);
334 for (i, ptr) in field_ptrs.into_iter().enumerate() {
335 self.source_map.field_map.insert((res, i), ptr);
336 }
337 res
338 }
339 ast::Expr::FieldExpr(e) => {
340 let expr = self.collect_expr_opt(e.expr());
341 let name = match e.field_access() {
342 Some(kind) => kind.as_name(),
343 _ => Name::missing(),
344 };
345 self.alloc_expr(Expr::Field { expr, name }, syntax_ptr)
346 }
347 ast::Expr::AwaitExpr(e) => {
348 let expr = self.collect_expr_opt(e.expr());
349 self.alloc_expr(Expr::Await { expr }, syntax_ptr)
350 }
351 ast::Expr::TryExpr(e) => {
352 let expr = self.collect_expr_opt(e.expr());
353 self.alloc_expr(Expr::Try { expr }, syntax_ptr)
354 }
355 ast::Expr::CastExpr(e) => {
356 let expr = self.collect_expr_opt(e.expr());
357 let type_ref = TypeRef::from_ast_opt(e.type_ref());
358 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
359 }
360 ast::Expr::RefExpr(e) => {
361 let expr = self.collect_expr_opt(e.expr());
362 let mutability = Mutability::from_mutable(e.is_mut());
363 self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr)
364 }
365 ast::Expr::PrefixExpr(e) => {
366 let expr = self.collect_expr_opt(e.expr());
367 if let Some(op) = e.op_kind() {
368 self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
369 } else {
370 self.alloc_expr(Expr::Missing, syntax_ptr)
371 }
372 }
373 ast::Expr::LambdaExpr(e) => {
374 let mut args = Vec::new();
375 let mut arg_types = Vec::new();
376 if let Some(pl) = e.param_list() {
377 for param in pl.params() {
378 let pat = self.collect_pat_opt(param.pat());
379 let type_ref = param.ascribed_type().map(TypeRef::from_ast);
380 args.push(pat);
381 arg_types.push(type_ref);
382 }
383 }
384 let body = self.collect_expr_opt(e.body());
385 self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr)
386 }
387 ast::Expr::BinExpr(e) => {
388 let lhs = self.collect_expr_opt(e.lhs());
389 let rhs = self.collect_expr_opt(e.rhs());
390 let op = e.op_kind().map(BinaryOp::from);
391 self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr)
392 }
393 ast::Expr::TupleExpr(e) => {
394 let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect();
395 self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr)
396 }
397 ast::Expr::BoxExpr(e) => {
398 let expr = self.collect_expr_opt(e.expr());
399 self.alloc_expr(Expr::Box { expr }, syntax_ptr)
400 }
401
402 ast::Expr::ArrayExpr(e) => {
403 let kind = e.kind();
404
405 match kind {
406 ArrayExprKind::ElementList(e) => {
407 let exprs = e.map(|expr| self.collect_expr(expr)).collect();
408 self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr)
409 }
410 ArrayExprKind::Repeat { initializer, repeat } => {
411 let initializer = self.collect_expr_opt(initializer);
412 let repeat = self.collect_expr_opt(repeat);
413 self.alloc_expr(
414 Expr::Array(Array::Repeat { initializer, repeat }),
415 syntax_ptr,
416 )
417 }
418 }
419 }
420
421 ast::Expr::Literal(e) => {
422 let lit = match e.kind() {
423 LiteralKind::IntNumber { suffix } => {
424 let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it));
425
426 Literal::Int(Default::default(), known_name)
427 }
428 LiteralKind::FloatNumber { suffix } => {
429 let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it));
430
431 Literal::Float(Default::default(), known_name)
432 }
433 LiteralKind::ByteString => Literal::ByteString(Default::default()),
434 LiteralKind::String => Literal::String(Default::default()),
435 LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)),
436 LiteralKind::Bool => Literal::Bool(Default::default()),
437 LiteralKind::Char => Literal::Char(Default::default()),
438 };
439 self.alloc_expr(Expr::Literal(lit), syntax_ptr)
440 }
441 ast::Expr::IndexExpr(e) => {
442 let base = self.collect_expr_opt(e.base());
443 let index = self.collect_expr_opt(e.index());
444 self.alloc_expr(Expr::Index { base, index }, syntax_ptr)
445 }
446
447 // FIXME implement HIR for these:
448 ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
449 ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
450 ast::Expr::MacroCall(e) => {
451 let ast_id = AstId::new(
452 self.current_file_id,
453 self.db.ast_id_map(self.current_file_id).ast_id(&e),
454 );
455
456 if let Some(path) = e.path().and_then(|path| self.parse_path(path)) {
457 if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) {
458 let call_id = self.db.intern_macro(MacroCallLoc { def, ast_id });
459 let file_id = call_id.as_file(MacroFileKind::Expr);
460 if let Some(node) = self.db.parse_or_expand(file_id) {
461 if let Some(expr) = ast::Expr::cast(node) {
462 log::debug!("macro expansion {:#?}", expr.syntax());
463 let old_file_id =
464 std::mem::replace(&mut self.current_file_id, file_id);
465 let id = self.collect_expr(expr);
466 self.current_file_id = old_file_id;
467 return id;
468 }
469 }
470 }
471 }
472 // FIXME: Instead of just dropping the error from expansion
473 // report it
474 self.alloc_expr(Expr::Missing, syntax_ptr)
475 }
476 }
477 }
478
479 fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
480 if let Some(expr) = expr {
481 self.collect_expr(expr)
482 } else {
483 self.missing_expr()
484 }
485 }
486
487 fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId {
488 let syntax_node_ptr = AstPtr::new(&expr.clone().into());
489 let block = match expr.block() {
490 Some(block) => block,
491 None => return self.alloc_expr(Expr::Missing, syntax_node_ptr),
492 };
493 let statements = block
494 .statements()
495 .map(|s| match s {
496 ast::Stmt::LetStmt(stmt) => {
497 let pat = self.collect_pat_opt(stmt.pat());
498 let type_ref = stmt.ascribed_type().map(TypeRef::from_ast);
499 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
500 Statement::Let { pat, type_ref, initializer }
501 }
502 ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())),
503 })
504 .collect();
505 let tail = block.expr().map(|e| self.collect_expr(e));
506 self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr)
507 }
508
509 fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
510 if let Some(block) = expr {
511 self.collect_block(block)
512 } else {
513 self.missing_expr()
514 }
515 }
516
517 fn collect_pat(&mut self, pat: ast::Pat) -> PatId {
518 let pattern = match &pat {
519 ast::Pat::BindPat(bp) => {
520 let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
521 let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref());
522 let subpat = bp.pat().map(|subpat| self.collect_pat(subpat));
523 Pat::Bind { name, mode: annotation, subpat }
524 }
525 ast::Pat::TupleStructPat(p) => {
526 let path = p.path().and_then(|path| self.parse_path(path));
527 let args = p.args().map(|p| self.collect_pat(p)).collect();
528 Pat::TupleStruct { path, args }
529 }
530 ast::Pat::RefPat(p) => {
531 let pat = self.collect_pat_opt(p.pat());
532 let mutability = Mutability::from_mutable(p.is_mut());
533 Pat::Ref { pat, mutability }
534 }
535 ast::Pat::PathPat(p) => {
536 let path = p.path().and_then(|path| self.parse_path(path));
537 path.map(Pat::Path).unwrap_or(Pat::Missing)
538 }
539 ast::Pat::TuplePat(p) => {
540 let args = p.args().map(|p| self.collect_pat(p)).collect();
541 Pat::Tuple(args)
542 }
543 ast::Pat::PlaceholderPat(_) => Pat::Wild,
544 ast::Pat::RecordPat(p) => {
545 let path = p.path().and_then(|path| self.parse_path(path));
546 let record_field_pat_list =
547 p.record_field_pat_list().expect("every struct should have a field list");
548 let mut fields: Vec<_> = record_field_pat_list
549 .bind_pats()
550 .filter_map(|bind_pat| {
551 let ast_pat =
552 ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat");
553 let pat = self.collect_pat(ast_pat);
554 let name = bind_pat.name()?.as_name();
555 Some(RecordFieldPat { name, pat })
556 })
557 .collect();
558 let iter = record_field_pat_list.record_field_pats().filter_map(|f| {
559 let ast_pat = f.pat()?;
560 let pat = self.collect_pat(ast_pat);
561 let name = f.name()?.as_name();
562 Some(RecordFieldPat { name, pat })
563 });
564 fields.extend(iter);
565
566 Pat::Record { path, args: fields }
567 }
568
569 // FIXME: implement
570 ast::Pat::DotDotPat(_) => Pat::Missing,
571 ast::Pat::BoxPat(_) => Pat::Missing,
572 ast::Pat::LiteralPat(_) => Pat::Missing,
573 ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing,
574 };
575 let ptr = AstPtr::new(&pat);
576 self.alloc_pat(pattern, Either::A(ptr))
577 }
578
579 fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
580 if let Some(pat) = pat {
581 self.collect_pat(pat)
582 } else {
583 self.missing_pat()
584 }
585 }
586
587 fn parse_path(&mut self, path: ast::Path) -> Option<Path> {
588 let hygiene = Hygiene::new(self.db, self.current_file_id);
589 Path::from_src(path, &hygiene)
590 }
591}
6 592
7impl From<ast::BinOp> for BinaryOp { 593impl From<ast::BinOp> for BinaryOp {
8 fn from(ast_op: ast::BinOp) -> Self { 594 fn from(ast_op: ast::BinOp) -> Self {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-26 05:42:22 +0000