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-rw-r--r--crates/ra_hir/src/expr/lower.rs593
1 files changed, 0 insertions, 593 deletions
diff --git a/crates/ra_hir/src/expr/lower.rs b/crates/ra_hir/src/expr/lower.rs
deleted file mode 100644
index adc68b23c..000000000
--- a/crates/ra_hir/src/expr/lower.rs
+++ /dev/null
@@ -1,593 +0,0 @@
1//! FIXME: write short doc here
2
3use hir_def::{
4 builtin_type::{BuiltinFloat, BuiltinInt},
5 path::GenericArgs,
6 type_ref::TypeRef,
7};
8use hir_expand::{
9 hygiene::Hygiene,
10 name::{self, AsName, Name},
11};
12use ra_arena::Arena;
13use ra_syntax::{
14 ast::{
15 self, ArgListOwner, ArrayExprKind, LiteralKind, LoopBodyOwner, NameOwner,
16 TypeAscriptionOwner,
17 },
18 AstNode, AstPtr,
19};
20use test_utils::tested_by;
21
22use crate::{
23 db::HirDatabase, AstId, Either, HirFileId, MacroCallLoc, MacroFileKind, Mutability, Path,
24 Resolver, Source,
25};
26
27use super::{
28 Array, BinaryOp, BindingAnnotation, Body, BodySourceMap, Expr, ExprId, Literal, MatchArm, Pat,
29 PatId, PatPtr, RecordFieldPat, RecordLitField, Statement,
30};
31
32pub(super) fn lower(
33 db: &impl HirDatabase,
34 resolver: Resolver,
35 file_id: HirFileId,
36 params: Option<ast::ParamList>,
37 body: Option<ast::Expr>,
38) -> (Body, BodySourceMap) {
39 ExprCollector {
40 resolver,
41 db,
42 original_file_id: file_id,
43 current_file_id: file_id,
44 source_map: BodySourceMap::default(),
45 body: Body {
46 exprs: Arena::default(),
47 pats: Arena::default(),
48 params: Vec::new(),
49 body_expr: ExprId::dummy(),
50 },
51 }
52 .collect(params, body)
53}
54
55struct ExprCollector<DB> {
56 db: DB,
57 resolver: Resolver,
58 // Expr collector expands macros along the way. original points to the file
59 // we started with, current points to the current macro expansion. source
60 // maps don't support macros yet, so we only record info into source map if
61 // current == original (see #1196)
62 original_file_id: HirFileId,
63 current_file_id: HirFileId,
64
65 body: Body,
66 source_map: BodySourceMap,
67}
68
69impl<'a, DB> ExprCollector<&'a DB>
70where
71 DB: HirDatabase,
72{
73 fn collect(
74 mut self,
75 param_list: Option<ast::ParamList>,
76 body: Option<ast::Expr>,
77 ) -> (Body, BodySourceMap) {
78 if let Some(param_list) = param_list {
79 if let Some(self_param) = param_list.self_param() {
80 let ptr = AstPtr::new(&self_param);
81 let param_pat = self.alloc_pat(
82 Pat::Bind {
83 name: name::SELF_PARAM,
84 mode: BindingAnnotation::Unannotated,
85 subpat: None,
86 },
87 Either::B(ptr),
88 );
89 self.body.params.push(param_pat);
90 }
91
92 for param in param_list.params() {
93 let pat = match param.pat() {
94 None => continue,
95 Some(pat) => pat,
96 };
97 let param_pat = self.collect_pat(pat);
98 self.body.params.push(param_pat);
99 }
100 };
101
102 self.body.body_expr = self.collect_expr_opt(body);
103 (self.body, self.source_map)
104 }
105
106 fn alloc_expr(&mut self, expr: Expr, ptr: AstPtr<ast::Expr>) -> ExprId {
107 let ptr = Either::A(ptr);
108 let id = self.body.exprs.alloc(expr);
109 if self.current_file_id == self.original_file_id {
110 self.source_map.expr_map.insert(ptr, id);
111 }
112 self.source_map
113 .expr_map_back
114 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
115 id
116 }
117 // desugared exprs don't have ptr, that's wrong and should be fixed
118 // somehow.
119 fn alloc_expr_desugared(&mut self, expr: Expr) -> ExprId {
120 self.body.exprs.alloc(expr)
121 }
122 fn alloc_expr_field_shorthand(&mut self, expr: Expr, ptr: AstPtr<ast::RecordField>) -> ExprId {
123 let ptr = Either::B(ptr);
124 let id = self.body.exprs.alloc(expr);
125 if self.current_file_id == self.original_file_id {
126 self.source_map.expr_map.insert(ptr, id);
127 }
128 self.source_map
129 .expr_map_back
130 .insert(id, Source { file_id: self.current_file_id, ast: ptr });
131 id
132 }
133 fn alloc_pat(&mut self, pat: Pat, ptr: PatPtr) -> PatId {
134 let id = self.body.pats.alloc(pat);
135 if self.current_file_id == self.original_file_id {
136 self.source_map.pat_map.insert(ptr, id);
137 }
138 self.source_map.pat_map_back.insert(id, Source { file_id: self.current_file_id, ast: ptr });
139 id
140 }
141
142 fn empty_block(&mut self) -> ExprId {
143 let block = Expr::Block { statements: Vec::new(), tail: None };
144 self.body.exprs.alloc(block)
145 }
146
147 fn missing_expr(&mut self) -> ExprId {
148 self.body.exprs.alloc(Expr::Missing)
149 }
150
151 fn missing_pat(&mut self) -> PatId {
152 self.body.pats.alloc(Pat::Missing)
153 }
154
155 fn collect_expr(&mut self, expr: ast::Expr) -> ExprId {
156 let syntax_ptr = AstPtr::new(&expr);
157 match expr {
158 ast::Expr::IfExpr(e) => {
159 let then_branch = self.collect_block_opt(e.then_branch());
160
161 let else_branch = e.else_branch().map(|b| match b {
162 ast::ElseBranch::Block(it) => self.collect_block(it),
163 ast::ElseBranch::IfExpr(elif) => {
164 let expr: ast::Expr = ast::Expr::cast(elif.syntax().clone()).unwrap();
165 self.collect_expr(expr)
166 }
167 });
168
169 let condition = match e.condition() {
170 None => self.missing_expr(),
171 Some(condition) => match condition.pat() {
172 None => self.collect_expr_opt(condition.expr()),
173 // if let -- desugar to match
174 Some(pat) => {
175 let pat = self.collect_pat(pat);
176 let match_expr = self.collect_expr_opt(condition.expr());
177 let placeholder_pat = self.missing_pat();
178 let arms = vec![
179 MatchArm { pats: vec![pat], expr: then_branch, guard: None },
180 MatchArm {
181 pats: vec![placeholder_pat],
182 expr: else_branch.unwrap_or_else(|| self.empty_block()),
183 guard: None,
184 },
185 ];
186 return self
187 .alloc_expr(Expr::Match { expr: match_expr, arms }, syntax_ptr);
188 }
189 },
190 };
191
192 self.alloc_expr(Expr::If { condition, then_branch, else_branch }, syntax_ptr)
193 }
194 ast::Expr::TryBlockExpr(e) => {
195 let body = self.collect_block_opt(e.body());
196 self.alloc_expr(Expr::TryBlock { body }, syntax_ptr)
197 }
198 ast::Expr::BlockExpr(e) => self.collect_block(e),
199 ast::Expr::LoopExpr(e) => {
200 let body = self.collect_block_opt(e.loop_body());
201 self.alloc_expr(Expr::Loop { body }, syntax_ptr)
202 }
203 ast::Expr::WhileExpr(e) => {
204 let body = self.collect_block_opt(e.loop_body());
205
206 let condition = match e.condition() {
207 None => self.missing_expr(),
208 Some(condition) => match condition.pat() {
209 None => self.collect_expr_opt(condition.expr()),
210 // if let -- desugar to match
211 Some(pat) => {
212 tested_by!(infer_while_let);
213 let pat = self.collect_pat(pat);
214 let match_expr = self.collect_expr_opt(condition.expr());
215 let placeholder_pat = self.missing_pat();
216 let break_ = self.alloc_expr_desugared(Expr::Break { expr: None });
217 let arms = vec![
218 MatchArm { pats: vec![pat], expr: body, guard: None },
219 MatchArm { pats: vec![placeholder_pat], expr: break_, guard: None },
220 ];
221 let match_expr =
222 self.alloc_expr_desugared(Expr::Match { expr: match_expr, arms });
223 return self.alloc_expr(Expr::Loop { body: match_expr }, syntax_ptr);
224 }
225 },
226 };
227
228 self.alloc_expr(Expr::While { condition, body }, syntax_ptr)
229 }
230 ast::Expr::ForExpr(e) => {
231 let iterable = self.collect_expr_opt(e.iterable());
232 let pat = self.collect_pat_opt(e.pat());
233 let body = self.collect_block_opt(e.loop_body());
234 self.alloc_expr(Expr::For { iterable, pat, body }, syntax_ptr)
235 }
236 ast::Expr::CallExpr(e) => {
237 let callee = self.collect_expr_opt(e.expr());
238 let args = if let Some(arg_list) = e.arg_list() {
239 arg_list.args().map(|e| self.collect_expr(e)).collect()
240 } else {
241 Vec::new()
242 };
243 self.alloc_expr(Expr::Call { callee, args }, syntax_ptr)
244 }
245 ast::Expr::MethodCallExpr(e) => {
246 let receiver = self.collect_expr_opt(e.expr());
247 let args = if let Some(arg_list) = e.arg_list() {
248 arg_list.args().map(|e| self.collect_expr(e)).collect()
249 } else {
250 Vec::new()
251 };
252 let method_name = e.name_ref().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
253 let generic_args = e.type_arg_list().and_then(GenericArgs::from_ast);
254 self.alloc_expr(
255 Expr::MethodCall { receiver, method_name, args, generic_args },
256 syntax_ptr,
257 )
258 }
259 ast::Expr::MatchExpr(e) => {
260 let expr = self.collect_expr_opt(e.expr());
261 let arms = if let Some(match_arm_list) = e.match_arm_list() {
262 match_arm_list
263 .arms()
264 .map(|arm| MatchArm {
265 pats: arm.pats().map(|p| self.collect_pat(p)).collect(),
266 expr: self.collect_expr_opt(arm.expr()),
267 guard: arm
268 .guard()
269 .and_then(|guard| guard.expr())
270 .map(|e| self.collect_expr(e)),
271 })
272 .collect()
273 } else {
274 Vec::new()
275 };
276 self.alloc_expr(Expr::Match { expr, arms }, syntax_ptr)
277 }
278 ast::Expr::PathExpr(e) => {
279 let path = e
280 .path()
281 .and_then(|path| self.parse_path(path))
282 .map(Expr::Path)
283 .unwrap_or(Expr::Missing);
284 self.alloc_expr(path, syntax_ptr)
285 }
286 ast::Expr::ContinueExpr(_e) => {
287 // FIXME: labels
288 self.alloc_expr(Expr::Continue, syntax_ptr)
289 }
290 ast::Expr::BreakExpr(e) => {
291 let expr = e.expr().map(|e| self.collect_expr(e));
292 self.alloc_expr(Expr::Break { expr }, syntax_ptr)
293 }
294 ast::Expr::ParenExpr(e) => {
295 let inner = self.collect_expr_opt(e.expr());
296 // make the paren expr point to the inner expression as well
297 self.source_map.expr_map.insert(Either::A(syntax_ptr), inner);
298 inner
299 }
300 ast::Expr::ReturnExpr(e) => {
301 let expr = e.expr().map(|e| self.collect_expr(e));
302 self.alloc_expr(Expr::Return { expr }, syntax_ptr)
303 }
304 ast::Expr::RecordLit(e) => {
305 let path = e.path().and_then(|path| self.parse_path(path));
306 let mut field_ptrs = Vec::new();
307 let record_lit = if let Some(nfl) = e.record_field_list() {
308 let fields = nfl
309 .fields()
310 .inspect(|field| field_ptrs.push(AstPtr::new(field)))
311 .map(|field| RecordLitField {
312 name: field
313 .name_ref()
314 .map(|nr| nr.as_name())
315 .unwrap_or_else(Name::missing),
316 expr: if let Some(e) = field.expr() {
317 self.collect_expr(e)
318 } else if let Some(nr) = field.name_ref() {
319 // field shorthand
320 self.alloc_expr_field_shorthand(
321 Expr::Path(Path::from_name_ref(&nr)),
322 AstPtr::new(&field),
323 )
324 } else {
325 self.missing_expr()
326 },
327 })
328 .collect();
329 let spread = nfl.spread().map(|s| self.collect_expr(s));
330 Expr::RecordLit { path, fields, spread }
331 } else {
332 Expr::RecordLit { path, fields: Vec::new(), spread: None }
333 };
334
335 let res = self.alloc_expr(record_lit, syntax_ptr);
336 for (i, ptr) in field_ptrs.into_iter().enumerate() {
337 self.source_map.field_map.insert((res, i), ptr);
338 }
339 res
340 }
341 ast::Expr::FieldExpr(e) => {
342 let expr = self.collect_expr_opt(e.expr());
343 let name = match e.field_access() {
344 Some(kind) => kind.as_name(),
345 _ => Name::missing(),
346 };
347 self.alloc_expr(Expr::Field { expr, name }, syntax_ptr)
348 }
349 ast::Expr::AwaitExpr(e) => {
350 let expr = self.collect_expr_opt(e.expr());
351 self.alloc_expr(Expr::Await { expr }, syntax_ptr)
352 }
353 ast::Expr::TryExpr(e) => {
354 let expr = self.collect_expr_opt(e.expr());
355 self.alloc_expr(Expr::Try { expr }, syntax_ptr)
356 }
357 ast::Expr::CastExpr(e) => {
358 let expr = self.collect_expr_opt(e.expr());
359 let type_ref = TypeRef::from_ast_opt(e.type_ref());
360 self.alloc_expr(Expr::Cast { expr, type_ref }, syntax_ptr)
361 }
362 ast::Expr::RefExpr(e) => {
363 let expr = self.collect_expr_opt(e.expr());
364 let mutability = Mutability::from_mutable(e.is_mut());
365 self.alloc_expr(Expr::Ref { expr, mutability }, syntax_ptr)
366 }
367 ast::Expr::PrefixExpr(e) => {
368 let expr = self.collect_expr_opt(e.expr());
369 if let Some(op) = e.op_kind() {
370 self.alloc_expr(Expr::UnaryOp { expr, op }, syntax_ptr)
371 } else {
372 self.alloc_expr(Expr::Missing, syntax_ptr)
373 }
374 }
375 ast::Expr::LambdaExpr(e) => {
376 let mut args = Vec::new();
377 let mut arg_types = Vec::new();
378 if let Some(pl) = e.param_list() {
379 for param in pl.params() {
380 let pat = self.collect_pat_opt(param.pat());
381 let type_ref = param.ascribed_type().map(TypeRef::from_ast);
382 args.push(pat);
383 arg_types.push(type_ref);
384 }
385 }
386 let body = self.collect_expr_opt(e.body());
387 self.alloc_expr(Expr::Lambda { args, arg_types, body }, syntax_ptr)
388 }
389 ast::Expr::BinExpr(e) => {
390 let lhs = self.collect_expr_opt(e.lhs());
391 let rhs = self.collect_expr_opt(e.rhs());
392 let op = e.op_kind().map(BinaryOp::from);
393 self.alloc_expr(Expr::BinaryOp { lhs, rhs, op }, syntax_ptr)
394 }
395 ast::Expr::TupleExpr(e) => {
396 let exprs = e.exprs().map(|expr| self.collect_expr(expr)).collect();
397 self.alloc_expr(Expr::Tuple { exprs }, syntax_ptr)
398 }
399 ast::Expr::BoxExpr(e) => {
400 let expr = self.collect_expr_opt(e.expr());
401 self.alloc_expr(Expr::Box { expr }, syntax_ptr)
402 }
403
404 ast::Expr::ArrayExpr(e) => {
405 let kind = e.kind();
406
407 match kind {
408 ArrayExprKind::ElementList(e) => {
409 let exprs = e.map(|expr| self.collect_expr(expr)).collect();
410 self.alloc_expr(Expr::Array(Array::ElementList(exprs)), syntax_ptr)
411 }
412 ArrayExprKind::Repeat { initializer, repeat } => {
413 let initializer = self.collect_expr_opt(initializer);
414 let repeat = self.collect_expr_opt(repeat);
415 self.alloc_expr(
416 Expr::Array(Array::Repeat { initializer, repeat }),
417 syntax_ptr,
418 )
419 }
420 }
421 }
422
423 ast::Expr::Literal(e) => {
424 let lit = match e.kind() {
425 LiteralKind::IntNumber { suffix } => {
426 let known_name = suffix.and_then(|it| BuiltinInt::from_suffix(&it));
427
428 Literal::Int(Default::default(), known_name)
429 }
430 LiteralKind::FloatNumber { suffix } => {
431 let known_name = suffix.and_then(|it| BuiltinFloat::from_suffix(&it));
432
433 Literal::Float(Default::default(), known_name)
434 }
435 LiteralKind::ByteString => Literal::ByteString(Default::default()),
436 LiteralKind::String => Literal::String(Default::default()),
437 LiteralKind::Byte => Literal::Int(Default::default(), Some(BuiltinInt::U8)),
438 LiteralKind::Bool => Literal::Bool(Default::default()),
439 LiteralKind::Char => Literal::Char(Default::default()),
440 };
441 self.alloc_expr(Expr::Literal(lit), syntax_ptr)
442 }
443 ast::Expr::IndexExpr(e) => {
444 let base = self.collect_expr_opt(e.base());
445 let index = self.collect_expr_opt(e.index());
446 self.alloc_expr(Expr::Index { base, index }, syntax_ptr)
447 }
448
449 // FIXME implement HIR for these:
450 ast::Expr::Label(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
451 ast::Expr::RangeExpr(_e) => self.alloc_expr(Expr::Missing, syntax_ptr),
452 ast::Expr::MacroCall(e) => {
453 let ast_id = AstId::new(
454 self.current_file_id,
455 self.db.ast_id_map(self.current_file_id).ast_id(&e),
456 );
457
458 if let Some(path) = e.path().and_then(|path| self.parse_path(path)) {
459 if let Some(def) = self.resolver.resolve_path_as_macro(self.db, &path) {
460 let call_id = self.db.intern_macro(MacroCallLoc { def: def.id, ast_id });
461 let file_id = call_id.as_file(MacroFileKind::Expr);
462 if let Some(node) = self.db.parse_or_expand(file_id) {
463 if let Some(expr) = ast::Expr::cast(node) {
464 log::debug!("macro expansion {:#?}", expr.syntax());
465 let old_file_id =
466 std::mem::replace(&mut self.current_file_id, file_id);
467 let id = self.collect_expr(expr);
468 self.current_file_id = old_file_id;
469 return id;
470 }
471 }
472 }
473 }
474 // FIXME: Instead of just dropping the error from expansion
475 // report it
476 self.alloc_expr(Expr::Missing, syntax_ptr)
477 }
478 }
479 }
480
481 fn collect_expr_opt(&mut self, expr: Option<ast::Expr>) -> ExprId {
482 if let Some(expr) = expr {
483 self.collect_expr(expr)
484 } else {
485 self.missing_expr()
486 }
487 }
488
489 fn collect_block(&mut self, expr: ast::BlockExpr) -> ExprId {
490 let syntax_node_ptr = AstPtr::new(&expr.clone().into());
491 let block = match expr.block() {
492 Some(block) => block,
493 None => return self.alloc_expr(Expr::Missing, syntax_node_ptr),
494 };
495 let statements = block
496 .statements()
497 .map(|s| match s {
498 ast::Stmt::LetStmt(stmt) => {
499 let pat = self.collect_pat_opt(stmt.pat());
500 let type_ref = stmt.ascribed_type().map(TypeRef::from_ast);
501 let initializer = stmt.initializer().map(|e| self.collect_expr(e));
502 Statement::Let { pat, type_ref, initializer }
503 }
504 ast::Stmt::ExprStmt(stmt) => Statement::Expr(self.collect_expr_opt(stmt.expr())),
505 })
506 .collect();
507 let tail = block.expr().map(|e| self.collect_expr(e));
508 self.alloc_expr(Expr::Block { statements, tail }, syntax_node_ptr)
509 }
510
511 fn collect_block_opt(&mut self, expr: Option<ast::BlockExpr>) -> ExprId {
512 if let Some(block) = expr {
513 self.collect_block(block)
514 } else {
515 self.missing_expr()
516 }
517 }
518
519 fn collect_pat(&mut self, pat: ast::Pat) -> PatId {
520 let pattern = match &pat {
521 ast::Pat::BindPat(bp) => {
522 let name = bp.name().map(|nr| nr.as_name()).unwrap_or_else(Name::missing);
523 let annotation = BindingAnnotation::new(bp.is_mutable(), bp.is_ref());
524 let subpat = bp.pat().map(|subpat| self.collect_pat(subpat));
525 Pat::Bind { name, mode: annotation, subpat }
526 }
527 ast::Pat::TupleStructPat(p) => {
528 let path = p.path().and_then(|path| self.parse_path(path));
529 let args = p.args().map(|p| self.collect_pat(p)).collect();
530 Pat::TupleStruct { path, args }
531 }
532 ast::Pat::RefPat(p) => {
533 let pat = self.collect_pat_opt(p.pat());
534 let mutability = Mutability::from_mutable(p.is_mut());
535 Pat::Ref { pat, mutability }
536 }
537 ast::Pat::PathPat(p) => {
538 let path = p.path().and_then(|path| self.parse_path(path));
539 path.map(Pat::Path).unwrap_or(Pat::Missing)
540 }
541 ast::Pat::TuplePat(p) => {
542 let args = p.args().map(|p| self.collect_pat(p)).collect();
543 Pat::Tuple(args)
544 }
545 ast::Pat::PlaceholderPat(_) => Pat::Wild,
546 ast::Pat::RecordPat(p) => {
547 let path = p.path().and_then(|path| self.parse_path(path));
548 let record_field_pat_list =
549 p.record_field_pat_list().expect("every struct should have a field list");
550 let mut fields: Vec<_> = record_field_pat_list
551 .bind_pats()
552 .filter_map(|bind_pat| {
553 let ast_pat =
554 ast::Pat::cast(bind_pat.syntax().clone()).expect("bind pat is a pat");
555 let pat = self.collect_pat(ast_pat);
556 let name = bind_pat.name()?.as_name();
557 Some(RecordFieldPat { name, pat })
558 })
559 .collect();
560 let iter = record_field_pat_list.record_field_pats().filter_map(|f| {
561 let ast_pat = f.pat()?;
562 let pat = self.collect_pat(ast_pat);
563 let name = f.name()?.as_name();
564 Some(RecordFieldPat { name, pat })
565 });
566 fields.extend(iter);
567
568 Pat::Record { path, args: fields }
569 }
570
571 // FIXME: implement
572 ast::Pat::DotDotPat(_) => Pat::Missing,
573 ast::Pat::BoxPat(_) => Pat::Missing,
574 ast::Pat::LiteralPat(_) => Pat::Missing,
575 ast::Pat::SlicePat(_) | ast::Pat::RangePat(_) => Pat::Missing,
576 };
577 let ptr = AstPtr::new(&pat);
578 self.alloc_pat(pattern, Either::A(ptr))
579 }
580
581 fn collect_pat_opt(&mut self, pat: Option<ast::Pat>) -> PatId {
582 if let Some(pat) = pat {
583 self.collect_pat(pat)
584 } else {
585 self.missing_pat()
586 }
587 }
588
589 fn parse_path(&mut self, path: ast::Path) -> Option<Path> {
590 let hygiene = Hygiene::new(self.db, self.current_file_id);
591 Path::from_src(path, &hygiene)
592 }
593}
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