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-rw-r--r--crates/ra_analysis/src/call_info.rs451
1 files changed, 0 insertions, 451 deletions
diff --git a/crates/ra_analysis/src/call_info.rs b/crates/ra_analysis/src/call_info.rs
deleted file mode 100644
index 27b760780..000000000
--- a/crates/ra_analysis/src/call_info.rs
+++ /dev/null
@@ -1,451 +0,0 @@
1use std::cmp::{max, min};
2
3use ra_db::{SyntaxDatabase, Cancelable};
4use ra_syntax::{
5 AstNode, SyntaxNode, TextUnit, TextRange,
6 SyntaxKind::FN_DEF,
7 ast::{self, ArgListOwner, DocCommentsOwner},
8 algo::find_node_at_offset,
9};
10
11use crate::{FilePosition, CallInfo, db::RootDatabase};
12
13/// Computes parameter information for the given call expression.
14pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Cancelable<Option<CallInfo>> {
15 let file = db.source_file(position.file_id);
16 let syntax = file.syntax();
17
18 // Find the calling expression and it's NameRef
19 let calling_node = ctry!(FnCallNode::with_node(syntax, position.offset));
20 let name_ref = ctry!(calling_node.name_ref());
21
22 // Resolve the function's NameRef (NOTE: this isn't entirely accurate).
23 let file_symbols = db.index_resolve(name_ref)?;
24 let symbol = ctry!(file_symbols.into_iter().find(|it| it.ptr.kind() == FN_DEF));
25 let fn_file = db.source_file(symbol.file_id);
26 let fn_def = symbol.ptr.resolve(&fn_file);
27 let fn_def = ast::FnDef::cast(&fn_def).unwrap();
28 let mut call_info = ctry!(CallInfo::new(fn_def));
29 // If we have a calling expression let's find which argument we are on
30 let num_params = call_info.parameters.len();
31 let has_self = fn_def.param_list().and_then(|l| l.self_param()).is_some();
32
33 if num_params == 1 {
34 if !has_self {
35 call_info.active_parameter = Some(0);
36 }
37 } else if num_params > 1 {
38 // Count how many parameters into the call we are.
39 // TODO: This is best effort for now and should be fixed at some point.
40 // It may be better to see where we are in the arg_list and then check
41 // where offset is in that list (or beyond).
42 // Revisit this after we get documentation comments in.
43 if let Some(ref arg_list) = calling_node.arg_list() {
44 let start = arg_list.syntax().range().start();
45
46 let range_search = TextRange::from_to(start, position.offset);
47 let mut commas: usize = arg_list
48 .syntax()
49 .text()
50 .slice(range_search)
51 .to_string()
52 .matches(',')
53 .count();
54
55 // If we have a method call eat the first param since it's just self.
56 if has_self {
57 commas += 1;
58 }
59
60 call_info.active_parameter = Some(commas);
61 }
62 }
63
64 Ok(Some(call_info))
65}
66
67enum FnCallNode<'a> {
68 CallExpr(&'a ast::CallExpr),
69 MethodCallExpr(&'a ast::MethodCallExpr),
70}
71
72impl<'a> FnCallNode<'a> {
73 pub fn with_node(syntax: &'a SyntaxNode, offset: TextUnit) -> Option<FnCallNode<'a>> {
74 if let Some(expr) = find_node_at_offset::<ast::CallExpr>(syntax, offset) {
75 return Some(FnCallNode::CallExpr(expr));
76 }
77 if let Some(expr) = find_node_at_offset::<ast::MethodCallExpr>(syntax, offset) {
78 return Some(FnCallNode::MethodCallExpr(expr));
79 }
80 None
81 }
82
83 pub fn name_ref(&self) -> Option<&'a ast::NameRef> {
84 match *self {
85 FnCallNode::CallExpr(call_expr) => Some(match call_expr.expr()?.kind() {
86 ast::ExprKind::PathExpr(path_expr) => path_expr.path()?.segment()?.name_ref()?,
87 _ => return None,
88 }),
89
90 FnCallNode::MethodCallExpr(call_expr) => call_expr
91 .syntax()
92 .children()
93 .filter_map(ast::NameRef::cast)
94 .nth(0),
95 }
96 }
97
98 pub fn arg_list(&self) -> Option<&'a ast::ArgList> {
99 match *self {
100 FnCallNode::CallExpr(expr) => expr.arg_list(),
101 FnCallNode::MethodCallExpr(expr) => expr.arg_list(),
102 }
103 }
104}
105
106impl CallInfo {
107 fn new(node: &ast::FnDef) -> Option<Self> {
108 let mut doc = None;
109
110 // Strip the body out for the label.
111 let mut label: String = if let Some(body) = node.body() {
112 let body_range = body.syntax().range();
113 let label: String = node
114 .syntax()
115 .children()
116 .filter(|child| !child.range().is_subrange(&body_range))
117 .map(|node| node.text().to_string())
118 .collect();
119 label
120 } else {
121 node.syntax().text().to_string()
122 };
123
124 if let Some((comment_range, docs)) = extract_doc_comments(node) {
125 let comment_range = comment_range
126 .checked_sub(node.syntax().range().start())
127 .unwrap();
128 let start = comment_range.start().to_usize();
129 let end = comment_range.end().to_usize();
130
131 // Remove the comment from the label
132 label.replace_range(start..end, "");
133
134 // Massage markdown
135 let mut processed_lines = Vec::new();
136 let mut in_code_block = false;
137 for line in docs.lines() {
138 if line.starts_with("```") {
139 in_code_block = !in_code_block;
140 }
141
142 let line = if in_code_block && line.starts_with("```") && !line.contains("rust") {
143 "```rust".into()
144 } else {
145 line.to_string()
146 };
147
148 processed_lines.push(line);
149 }
150
151 if !processed_lines.is_empty() {
152 doc = Some(processed_lines.join("\n"));
153 }
154 }
155
156 Some(CallInfo {
157 parameters: param_list(node),
158 label: label.trim().to_owned(),
159 doc,
160 active_parameter: None,
161 })
162 }
163}
164
165fn extract_doc_comments(node: &ast::FnDef) -> Option<(TextRange, String)> {
166 if node.doc_comments().count() == 0 {
167 return None;
168 }
169
170 let comment_text = node.doc_comment_text();
171
172 let (begin, end) = node
173 .doc_comments()
174 .map(|comment| comment.syntax().range())
175 .map(|range| (range.start().to_usize(), range.end().to_usize()))
176 .fold((std::usize::MAX, std::usize::MIN), |acc, range| {
177 (min(acc.0, range.0), max(acc.1, range.1))
178 });
179
180 let range = TextRange::from_to(TextUnit::from_usize(begin), TextUnit::from_usize(end));
181
182 Some((range, comment_text))
183}
184
185fn param_list(node: &ast::FnDef) -> Vec<String> {
186 let mut res = vec![];
187 if let Some(param_list) = node.param_list() {
188 if let Some(self_param) = param_list.self_param() {
189 res.push(self_param.syntax().text().to_string())
190 }
191
192 // Maybe use param.pat here? See if we can just extract the name?
193 //res.extend(param_list.params().map(|p| p.syntax().text().to_string()));
194 res.extend(
195 param_list
196 .params()
197 .filter_map(|p| p.pat())
198 .map(|pat| pat.syntax().text().to_string()),
199 );
200 }
201 res
202}
203
204#[cfg(test)]
205mod tests {
206 use super::*;
207
208 use crate::mock_analysis::single_file_with_position;
209
210 fn call_info(text: &str) -> CallInfo {
211 let (analysis, position) = single_file_with_position(text);
212 analysis.call_info(position).unwrap().unwrap()
213 }
214
215 #[test]
216 fn test_fn_signature_two_args_first() {
217 let info = call_info(
218 r#"fn foo(x: u32, y: u32) -> u32 {x + y}
219fn bar() { foo(<|>3, ); }"#,
220 );
221
222 assert_eq!(info.parameters, vec!("x".to_string(), "y".to_string()));
223 assert_eq!(info.active_parameter, Some(0));
224 }
225
226 #[test]
227 fn test_fn_signature_two_args_second() {
228 let info = call_info(
229 r#"fn foo(x: u32, y: u32) -> u32 {x + y}
230fn bar() { foo(3, <|>); }"#,
231 );
232
233 assert_eq!(info.parameters, vec!("x".to_string(), "y".to_string()));
234 assert_eq!(info.active_parameter, Some(1));
235 }
236
237 #[test]
238 fn test_fn_signature_for_impl() {
239 let info = call_info(
240 r#"struct F; impl F { pub fn new() { F{}} }
241fn bar() {let _ : F = F::new(<|>);}"#,
242 );
243
244 assert_eq!(info.parameters, Vec::<String>::new());
245 assert_eq!(info.active_parameter, None);
246 }
247
248 #[test]
249 fn test_fn_signature_for_method_self() {
250 let info = call_info(
251 r#"struct F;
252impl F {
253 pub fn new() -> F{
254 F{}
255 }
256
257 pub fn do_it(&self) {}
258}
259
260fn bar() {
261 let f : F = F::new();
262 f.do_it(<|>);
263}"#,
264 );
265
266 assert_eq!(info.parameters, vec!["&self".to_string()]);
267 assert_eq!(info.active_parameter, None);
268 }
269
270 #[test]
271 fn test_fn_signature_for_method_with_arg() {
272 let info = call_info(
273 r#"struct F;
274impl F {
275 pub fn new() -> F{
276 F{}
277 }
278
279 pub fn do_it(&self, x: i32) {}
280}
281
282fn bar() {
283 let f : F = F::new();
284 f.do_it(<|>);
285}"#,
286 );
287
288 assert_eq!(info.parameters, vec!["&self".to_string(), "x".to_string()]);
289 assert_eq!(info.active_parameter, Some(1));
290 }
291
292 #[test]
293 fn test_fn_signature_with_docs_simple() {
294 let info = call_info(
295 r#"
296/// test
297// non-doc-comment
298fn foo(j: u32) -> u32 {
299 j
300}
301
302fn bar() {
303 let _ = foo(<|>);
304}
305"#,
306 );
307
308 assert_eq!(info.parameters, vec!["j".to_string()]);
309 assert_eq!(info.active_parameter, Some(0));
310 assert_eq!(info.label, "fn foo(j: u32) -> u32".to_string());
311 assert_eq!(info.doc, Some("test".into()));
312 }
313
314 #[test]
315 fn test_fn_signature_with_docs() {
316 let info = call_info(
317 r#"
318/// Adds one to the number given.
319///
320/// # Examples
321///
322/// ```
323/// let five = 5;
324///
325/// assert_eq!(6, my_crate::add_one(5));
326/// ```
327pub fn add_one(x: i32) -> i32 {
328 x + 1
329}
330
331pub fn do() {
332 add_one(<|>
333}"#,
334 );
335
336 assert_eq!(info.parameters, vec!["x".to_string()]);
337 assert_eq!(info.active_parameter, Some(0));
338 assert_eq!(info.label, "pub fn add_one(x: i32) -> i32".to_string());
339 assert_eq!(
340 info.doc,
341 Some(
342 r#"Adds one to the number given.
343
344# Examples
345
346```rust
347let five = 5;
348
349assert_eq!(6, my_crate::add_one(5));
350```"#
351 .into()
352 )
353 );
354 }
355
356 #[test]
357 fn test_fn_signature_with_docs_impl() {
358 let info = call_info(
359 r#"
360struct addr;
361impl addr {
362 /// Adds one to the number given.
363 ///
364 /// # Examples
365 ///
366 /// ```
367 /// let five = 5;
368 ///
369 /// assert_eq!(6, my_crate::add_one(5));
370 /// ```
371 pub fn add_one(x: i32) -> i32 {
372 x + 1
373 }
374}
375
376pub fn do_it() {
377 addr {};
378 addr::add_one(<|>);
379}"#,
380 );
381
382 assert_eq!(info.parameters, vec!["x".to_string()]);
383 assert_eq!(info.active_parameter, Some(0));
384 assert_eq!(info.label, "pub fn add_one(x: i32) -> i32".to_string());
385 assert_eq!(
386 info.doc,
387 Some(
388 r#"Adds one to the number given.
389
390# Examples
391
392```rust
393let five = 5;
394
395assert_eq!(6, my_crate::add_one(5));
396```"#
397 .into()
398 )
399 );
400 }
401
402 #[test]
403 fn test_fn_signature_with_docs_from_actix() {
404 let info = call_info(
405 r#"
406pub trait WriteHandler<E>
407where
408 Self: Actor,
409 Self::Context: ActorContext,
410{
411 /// Method is called when writer emits error.
412 ///
413 /// If this method returns `ErrorAction::Continue` writer processing
414 /// continues otherwise stream processing stops.
415 fn error(&mut self, err: E, ctx: &mut Self::Context) -> Running {
416 Running::Stop
417 }
418
419 /// Method is called when writer finishes.
420 ///
421 /// By default this method stops actor's `Context`.
422 fn finished(&mut self, ctx: &mut Self::Context) {
423 ctx.stop()
424 }
425}
426
427pub fn foo() {
428 WriteHandler r;
429 r.finished(<|>);
430}
431
432"#,
433 );
434
435 assert_eq!(
436 info.parameters,
437 vec!["&mut self".to_string(), "ctx".to_string()]
438 );
439 assert_eq!(info.active_parameter, Some(1));
440 assert_eq!(
441 info.doc,
442 Some(
443 r#"Method is called when writer finishes.
444
445By default this method stops actor's `Context`."#
446 .into()
447 )
448 );
449 }
450
451}
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