ide/
view_syntax_tree.rs

1use hir::Semantics;
2use ide_db::{
3    FileId, LineIndexDatabase, RootDatabase,
4    line_index::{LineCol, LineIndex},
5};
6use span::{TextRange, TextSize};
7use stdx::format_to;
8use syntax::{
9    AstNode, AstToken, NodeOrToken, SourceFile, SyntaxNode, SyntaxToken, WalkEvent,
10    ast::{self, IsString},
11};
12use triomphe::Arc;
13
14// Feature: Show Syntax Tree
15//
16// Shows a tree view with the syntax tree of the current file
17//
18// | Editor  | Panel Name |
19// |---------|-------------|
20// | VS Code | **Rust Syntax Tree** |
21pub(crate) fn view_syntax_tree(db: &RootDatabase, file_id: FileId) -> String {
22    let sema = Semantics::new(db);
23    let line_index = db.line_index(file_id);
24    let parse = sema.parse_guess_edition(file_id);
25
26    let ctx = SyntaxTreeCtx { line_index, in_string: None };
27
28    syntax_node_to_json(parse.syntax(), &ctx)
29}
30
31fn syntax_node_to_json(node: &SyntaxNode, ctx: &SyntaxTreeCtx) -> String {
32    let mut result = String::new();
33    for event in node.preorder_with_tokens() {
34        match event {
35            WalkEvent::Enter(it) => {
36                let kind = it.kind();
37                let (text_range, inner_range_str) = match &ctx.in_string {
38                    Some(in_string) => {
39                        let start_pos = TextPosition::new(&ctx.line_index, it.text_range().start());
40                        let end_pos = TextPosition::new(&ctx.line_index, it.text_range().end());
41
42                        let inner_start: u32 = it.text_range().start().into();
43                        let inner_end: u32 = it.text_range().start().into();
44
45                        let mut true_start = inner_start + in_string.offset;
46                        let mut true_end = inner_end + in_string.offset;
47                        for pos in &in_string.marker_positions {
48                            if *pos >= inner_end {
49                                break;
50                            }
51
52                            // We conditionally add to true_start in case
53                            // the marker is between the start and end.
54                            true_start += 2 * (*pos < inner_start) as u32;
55                            true_end += 2;
56                        }
57
58                        let true_range = TextRange::new(true_start.into(), true_end.into());
59
60                        (true_range, format!(r#","istart":{start_pos},"iend":{end_pos}"#,))
61                    }
62                    None => (it.text_range(), "".to_owned()),
63                };
64
65                let start = TextPosition::new(&ctx.line_index, text_range.start());
66                let end = TextPosition::new(&ctx.line_index, text_range.end());
67
68                match it {
69                    NodeOrToken::Node(_) => {
70                        format_to!(
71                            result,
72                            r#"{{"type":"Node","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str},"children":["#
73                        );
74                    }
75                    NodeOrToken::Token(token) => {
76                        let comma = if token.next_sibling_or_token().is_some() { "," } else { "" };
77                        match parse_rust_string(token, ctx) {
78                            Some(parsed) => {
79                                format_to!(
80                                    result,
81                                    r#"{{"type":"Node","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str},"children":[{parsed}]}}{comma}"#
82                                );
83                            }
84                            None => format_to!(
85                                result,
86                                r#"{{"type":"Token","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str}}}{comma}"#
87                            ),
88                        }
89                    }
90                }
91            }
92            WalkEvent::Leave(it) => match it {
93                NodeOrToken::Node(node) => {
94                    let comma = if node.next_sibling_or_token().is_some() { "," } else { "" };
95                    format_to!(result, "]}}{comma}")
96                }
97                NodeOrToken::Token(_) => (),
98            },
99        }
100    }
101
102    result
103}
104
105struct TextPosition {
106    offset: TextSize,
107    line: u32,
108    col: u32,
109}
110
111impl std::fmt::Display for TextPosition {
112    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
113        write!(f, "[{:?},{},{}]", self.offset, self.line, self.col)
114    }
115}
116
117impl TextPosition {
118    pub(crate) fn new(line_index: &LineIndex, offset: TextSize) -> Self {
119        let LineCol { line, col } = line_index.line_col(offset);
120        Self { offset, line, col }
121    }
122}
123
124fn parse_rust_string(token: SyntaxToken, ctx: &SyntaxTreeCtx) -> Option<String> {
125    let string_node = ast::String::cast(token)?;
126    let text = string_node.value().ok()?;
127
128    let mut trim_result = String::new();
129    let mut marker_positions = Vec::new();
130    let mut skipped = 0;
131    let mut last_end = 0;
132    for (start, part) in text.match_indices("$0") {
133        marker_positions.push((start - skipped) as u32);
134        trim_result.push_str(&text[last_end..start]);
135        skipped += part.len();
136        last_end = start + part.len();
137    }
138    trim_result.push_str(&text[last_end..text.len()]);
139
140    let parsed = SourceFile::parse(&trim_result, span::Edition::CURRENT);
141
142    if !parsed.errors().is_empty() {
143        return None;
144    }
145
146    let node: &SyntaxNode = &parsed.syntax_node();
147
148    if node.children().count() == 0 {
149        // C'mon, you should have at least one node other than SOURCE_FILE
150        return None;
151    }
152
153    let ctx = SyntaxTreeCtx {
154        line_index: ctx.line_index.clone(),
155        in_string: Some(InStringCtx {
156            offset: string_node.text_range_between_quotes()?.start().into(),
157            marker_positions,
158        }),
159    };
160
161    Some(syntax_node_to_json(node, &ctx))
162}
163
164struct SyntaxTreeCtx {
165    line_index: Arc<LineIndex>,
166    in_string: Option<InStringCtx>,
167}
168
169struct InStringCtx {
170    offset: u32,
171    marker_positions: Vec<u32>,
172}
173
174#[cfg(test)]
175mod tests {
176    use expect_test::expect;
177
178    use crate::fixture;
179
180    fn check(#[rust_analyzer::rust_fixture] ra_fixture: &str, expect: expect_test::Expect) {
181        let (analysis, file_id) = fixture::file(ra_fixture);
182        let syn = analysis.view_syntax_tree(file_id).unwrap();
183        expect.assert_eq(&syn)
184    }
185
186    #[test]
187    fn view_syntax_tree() {
188        // Basic syntax
189        check(
190            r#"fn foo() {}"#,
191            expect![[
192                r#"{"type":"Node","kind":"SOURCE_FILE","start":[0,0,0],"end":[11,0,11],"children":[{"type":"Node","kind":"FN","start":[0,0,0],"end":[11,0,11],"children":[{"type":"Token","kind":"FN_KW","start":[0,0,0],"end":[2,0,2]},{"type":"Token","kind":"WHITESPACE","start":[2,0,2],"end":[3,0,3]},{"type":"Node","kind":"NAME","start":[3,0,3],"end":[6,0,6],"children":[{"type":"Token","kind":"IDENT","start":[3,0,3],"end":[6,0,6]}]},{"type":"Node","kind":"PARAM_LIST","start":[6,0,6],"end":[8,0,8],"children":[{"type":"Token","kind":"L_PAREN","start":[6,0,6],"end":[7,0,7]},{"type":"Token","kind":"R_PAREN","start":[7,0,7],"end":[8,0,8]}]},{"type":"Token","kind":"WHITESPACE","start":[8,0,8],"end":[9,0,9]},{"type":"Node","kind":"BLOCK_EXPR","start":[9,0,9],"end":[11,0,11],"children":[{"type":"Node","kind":"STMT_LIST","start":[9,0,9],"end":[11,0,11],"children":[{"type":"Token","kind":"L_CURLY","start":[9,0,9],"end":[10,0,10]},{"type":"Token","kind":"R_CURLY","start":[10,0,10],"end":[11,0,11]}]}]}]}]}"#
193            ]],
194        );
195
196        check(
197            r#"
198fn test() {
199    assert!("
200    fn foo() {
201    }
202    ", "");
203}"#,
204            expect![[
205                r#"{"type":"Node","kind":"SOURCE_FILE","start":[0,0,0],"end":[60,5,1],"children":[{"type":"Node","kind":"FN","start":[0,0,0],"end":[60,5,1],"children":[{"type":"Token","kind":"FN_KW","start":[0,0,0],"end":[2,0,2]},{"type":"Token","kind":"WHITESPACE","start":[2,0,2],"end":[3,0,3]},{"type":"Node","kind":"NAME","start":[3,0,3],"end":[7,0,7],"children":[{"type":"Token","kind":"IDENT","start":[3,0,3],"end":[7,0,7]}]},{"type":"Node","kind":"PARAM_LIST","start":[7,0,7],"end":[9,0,9],"children":[{"type":"Token","kind":"L_PAREN","start":[7,0,7],"end":[8,0,8]},{"type":"Token","kind":"R_PAREN","start":[8,0,8],"end":[9,0,9]}]},{"type":"Token","kind":"WHITESPACE","start":[9,0,9],"end":[10,0,10]},{"type":"Node","kind":"BLOCK_EXPR","start":[10,0,10],"end":[60,5,1],"children":[{"type":"Node","kind":"STMT_LIST","start":[10,0,10],"end":[60,5,1],"children":[{"type":"Token","kind":"L_CURLY","start":[10,0,10],"end":[11,0,11]},{"type":"Token","kind":"WHITESPACE","start":[11,0,11],"end":[16,1,4]},{"type":"Node","kind":"EXPR_STMT","start":[16,1,4],"end":[58,4,11],"children":[{"type":"Node","kind":"MACRO_EXPR","start":[16,1,4],"end":[57,4,10],"children":[{"type":"Node","kind":"MACRO_CALL","start":[16,1,4],"end":[57,4,10],"children":[{"type":"Node","kind":"PATH","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Node","kind":"PATH_SEGMENT","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Node","kind":"NAME_REF","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Token","kind":"IDENT","start":[16,1,4],"end":[22,1,10]}]}]}]},{"type":"Token","kind":"BANG","start":[22,1,10],"end":[23,1,11]},{"type":"Node","kind":"TOKEN_TREE","start":[23,1,11],"end":[57,4,10],"children":[{"type":"Token","kind":"L_PAREN","start":[23,1,11],"end":[24,1,12]},{"type":"Node","kind":"STRING","start":[24,1,12],"end":[52,4,5],"children":[{"type":"Node","kind":"SOURCE_FILE","start":[25,1,13],"end":[25,1,13],"istart":[0,0,0],"iend":[26,2,0],"children":[{"type":"Token","kind":"WHITESPACE","start":[25,1,13],"end":[25,1,13],"istart":[0,0,0],"iend":[5,0,5]},{"type":"Node","kind":"FN","start":[30,2,4],"end":[30,2,4],"istart":[5,0,5],"iend":[21,1,9],"children":[{"type":"Token","kind":"FN_KW","start":[30,2,4],"end":[30,2,4],"istart":[5,0,5],"iend":[7,0,7]},{"type":"Token","kind":"WHITESPACE","start":[32,2,6],"end":[32,2,6],"istart":[7,0,7],"iend":[8,0,8]},{"type":"Node","kind":"NAME","start":[33,2,7],"end":[33,2,7],"istart":[8,0,8],"iend":[11,0,11],"children":[{"type":"Token","kind":"IDENT","start":[33,2,7],"end":[33,2,7],"istart":[8,0,8],"iend":[11,0,11]}]},{"type":"Node","kind":"PARAM_LIST","start":[36,2,10],"end":[36,2,10],"istart":[11,0,11],"iend":[13,1,1],"children":[{"type":"Token","kind":"L_PAREN","start":[36,2,10],"end":[36,2,10],"istart":[11,0,11],"iend":[12,1,0]},{"type":"Token","kind":"R_PAREN","start":[37,2,11],"end":[37,2,11],"istart":[12,1,0],"iend":[13,1,1]}]},{"type":"Token","kind":"WHITESPACE","start":[38,2,12],"end":[38,2,12],"istart":[13,1,1],"iend":[14,1,2]},{"type":"Node","kind":"BLOCK_EXPR","start":[39,2,13],"end":[39,2,13],"istart":[14,1,2],"iend":[21,1,9],"children":[{"type":"Node","kind":"STMT_LIST","start":[39,2,13],"end":[39,2,13],"istart":[14,1,2],"iend":[21,1,9],"children":[{"type":"Token","kind":"L_CURLY","start":[39,2,13],"end":[39,2,13],"istart":[14,1,2],"iend":[15,1,3]},{"type":"Token","kind":"WHITESPACE","start":[40,2,14],"end":[40,2,14],"istart":[15,1,3],"iend":[20,1,8]},{"type":"Token","kind":"R_CURLY","start":[45,3,4],"end":[45,3,4],"istart":[20,1,8],"iend":[21,1,9]}]}]}]},{"type":"Token","kind":"WHITESPACE","start":[46,3,5],"end":[46,3,5],"istart":[21,1,9],"iend":[26,2,0]}]}]},{"type":"Token","kind":"COMMA","start":[52,4,5],"end":[53,4,6]},{"type":"Token","kind":"WHITESPACE","start":[53,4,6],"end":[54,4,7]},{"type":"Token","kind":"STRING","start":[54,4,7],"end":[56,4,9]},{"type":"Token","kind":"R_PAREN","start":[56,4,9],"end":[57,4,10]}]}]}]},{"type":"Token","kind":"SEMICOLON","start":[57,4,10],"end":[58,4,11]}]},{"type":"Token","kind":"WHITESPACE","start":[58,4,11],"end":[59,5,0]},{"type":"Token","kind":"R_CURLY","start":[59,5,0],"end":[60,5,1]}]}]}]}]}"#
206            ]],
207        )
208    }
209
210    #[test]
211    fn view_syntax_tree_inside_string() {
212        check(
213            r#"fn test() {
214    assert!("
215$0fn foo() {
216}$0
217fn bar() {
218}
219    ", "");
220}"#,
221            expect![[
222                r#"{"type":"Node","kind":"SOURCE_FILE","start":[0,0,0],"end":[65,7,1],"children":[{"type":"Node","kind":"FN","start":[0,0,0],"end":[65,7,1],"children":[{"type":"Token","kind":"FN_KW","start":[0,0,0],"end":[2,0,2]},{"type":"Token","kind":"WHITESPACE","start":[2,0,2],"end":[3,0,3]},{"type":"Node","kind":"NAME","start":[3,0,3],"end":[7,0,7],"children":[{"type":"Token","kind":"IDENT","start":[3,0,3],"end":[7,0,7]}]},{"type":"Node","kind":"PARAM_LIST","start":[7,0,7],"end":[9,0,9],"children":[{"type":"Token","kind":"L_PAREN","start":[7,0,7],"end":[8,0,8]},{"type":"Token","kind":"R_PAREN","start":[8,0,8],"end":[9,0,9]}]},{"type":"Token","kind":"WHITESPACE","start":[9,0,9],"end":[10,0,10]},{"type":"Node","kind":"BLOCK_EXPR","start":[10,0,10],"end":[65,7,1],"children":[{"type":"Node","kind":"STMT_LIST","start":[10,0,10],"end":[65,7,1],"children":[{"type":"Token","kind":"L_CURLY","start":[10,0,10],"end":[11,0,11]},{"type":"Token","kind":"WHITESPACE","start":[11,0,11],"end":[16,1,4]},{"type":"Node","kind":"EXPR_STMT","start":[16,1,4],"end":[63,6,11],"children":[{"type":"Node","kind":"MACRO_EXPR","start":[16,1,4],"end":[62,6,10],"children":[{"type":"Node","kind":"MACRO_CALL","start":[16,1,4],"end":[62,6,10],"children":[{"type":"Node","kind":"PATH","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Node","kind":"PATH_SEGMENT","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Node","kind":"NAME_REF","start":[16,1,4],"end":[22,1,10],"children":[{"type":"Token","kind":"IDENT","start":[16,1,4],"end":[22,1,10]}]}]}]},{"type":"Token","kind":"BANG","start":[22,1,10],"end":[23,1,11]},{"type":"Node","kind":"TOKEN_TREE","start":[23,1,11],"end":[62,6,10],"children":[{"type":"Token","kind":"L_PAREN","start":[23,1,11],"end":[24,1,12]},{"type":"Node","kind":"STRING","start":[24,1,12],"end":[57,6,5],"children":[{"type":"Node","kind":"SOURCE_FILE","start":[25,1,13],"end":[25,1,13],"istart":[0,0,0],"iend":[31,2,5],"children":[{"type":"Token","kind":"WHITESPACE","start":[25,1,13],"end":[25,1,13],"istart":[0,0,0],"iend":[1,0,1]},{"type":"Node","kind":"FN","start":[26,2,0],"end":[26,2,0],"istart":[1,0,1],"iend":[13,1,1],"children":[{"type":"Token","kind":"FN_KW","start":[26,2,0],"end":[26,2,0],"istart":[1,0,1],"iend":[3,0,3]},{"type":"Token","kind":"WHITESPACE","start":[28,2,2],"end":[28,2,2],"istart":[3,0,3],"iend":[4,0,4]},{"type":"Node","kind":"NAME","start":[29,2,3],"end":[29,2,3],"istart":[4,0,4],"iend":[7,0,7],"children":[{"type":"Token","kind":"IDENT","start":[29,2,3],"end":[29,2,3],"istart":[4,0,4],"iend":[7,0,7]}]},{"type":"Node","kind":"PARAM_LIST","start":[32,2,6],"end":[32,2,6],"istart":[7,0,7],"iend":[9,0,9],"children":[{"type":"Token","kind":"L_PAREN","start":[32,2,6],"end":[32,2,6],"istart":[7,0,7],"iend":[8,0,8]},{"type":"Token","kind":"R_PAREN","start":[33,2,7],"end":[33,2,7],"istart":[8,0,8],"iend":[9,0,9]}]},{"type":"Token","kind":"WHITESPACE","start":[34,2,8],"end":[34,2,8],"istart":[9,0,9],"iend":[10,0,10]},{"type":"Node","kind":"BLOCK_EXPR","start":[35,2,9],"end":[35,2,9],"istart":[10,0,10],"iend":[13,1,1],"children":[{"type":"Node","kind":"STMT_LIST","start":[35,2,9],"end":[35,2,9],"istart":[10,0,10],"iend":[13,1,1],"children":[{"type":"Token","kind":"L_CURLY","start":[35,2,9],"end":[35,2,9],"istart":[10,0,10],"iend":[11,0,11]},{"type":"Token","kind":"WHITESPACE","start":[36,2,10],"end":[36,2,10],"istart":[11,0,11],"iend":[12,1,0]},{"type":"Token","kind":"R_CURLY","start":[37,3,0],"end":[37,3,0],"istart":[12,1,0],"iend":[13,1,1]}]}]}]},{"type":"Token","kind":"WHITESPACE","start":[38,3,1],"end":[38,3,1],"istart":[13,1,1],"iend":[14,1,2]},{"type":"Node","kind":"FN","start":[39,4,0],"end":[39,4,0],"istart":[14,1,2],"iend":[26,2,0],"children":[{"type":"Token","kind":"FN_KW","start":[39,4,0],"end":[39,4,0],"istart":[14,1,2],"iend":[16,1,4]},{"type":"Token","kind":"WHITESPACE","start":[41,4,2],"end":[41,4,2],"istart":[16,1,4],"iend":[17,1,5]},{"type":"Node","kind":"NAME","start":[42,4,3],"end":[42,4,3],"istart":[17,1,5],"iend":[20,1,8],"children":[{"type":"Token","kind":"IDENT","start":[42,4,3],"end":[42,4,3],"istart":[17,1,5],"iend":[20,1,8]}]},{"type":"Node","kind":"PARAM_LIST","start":[45,4,6],"end":[45,4,6],"istart":[20,1,8],"iend":[22,1,10],"children":[{"type":"Token","kind":"L_PAREN","start":[45,4,6],"end":[45,4,6],"istart":[20,1,8],"iend":[21,1,9]},{"type":"Token","kind":"R_PAREN","start":[46,4,7],"end":[46,4,7],"istart":[21,1,9],"iend":[22,1,10]}]},{"type":"Token","kind":"WHITESPACE","start":[47,4,8],"end":[47,4,8],"istart":[22,1,10],"iend":[23,1,11]},{"type":"Node","kind":"BLOCK_EXPR","start":[48,4,9],"end":[48,4,9],"istart":[23,1,11],"iend":[26,2,0],"children":[{"type":"Node","kind":"STMT_LIST","start":[48,4,9],"end":[48,4,9],"istart":[23,1,11],"iend":[26,2,0],"children":[{"type":"Token","kind":"L_CURLY","start":[48,4,9],"end":[48,4,9],"istart":[23,1,11],"iend":[24,1,12]},{"type":"Token","kind":"WHITESPACE","start":[49,4,10],"end":[49,4,10],"istart":[24,1,12],"iend":[25,1,13]},{"type":"Token","kind":"R_CURLY","start":[50,5,0],"end":[50,5,0],"istart":[25,1,13],"iend":[26,2,0]}]}]}]},{"type":"Token","kind":"WHITESPACE","start":[51,5,1],"end":[51,5,1],"istart":[26,2,0],"iend":[31,2,5]}]}]},{"type":"Token","kind":"COMMA","start":[57,6,5],"end":[58,6,6]},{"type":"Token","kind":"WHITESPACE","start":[58,6,6],"end":[59,6,7]},{"type":"Token","kind":"STRING","start":[59,6,7],"end":[61,6,9]},{"type":"Token","kind":"R_PAREN","start":[61,6,9],"end":[62,6,10]}]}]}]},{"type":"Token","kind":"SEMICOLON","start":[62,6,10],"end":[63,6,11]}]},{"type":"Token","kind":"WHITESPACE","start":[63,6,11],"end":[64,7,0]},{"type":"Token","kind":"R_CURLY","start":[64,7,0],"end":[65,7,1]}]}]}]}]}"#
223            ]],
224        );
225
226        // With a raw string
227        check(
228            r###"fn test() {
229    assert!(r#"
230$0fn foo() {
231}$0
232fn bar() {
233}
234    "#, "");
235}"###,
236            expect![[
237                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_CURLY","start":[52,5,0],"end":[52,5,0],"istart":[25,1,13],"iend":[26,1,14]}]}]}]},{"type":"Token","kind":"WHITESPACE","start":[53,5,1],"end":[53,5,1],"istart":[26,1,14],"iend":[31,2,3]}]}]},{"type":"Token","kind":"COMMA","start":[60,6,6],"end":[61,6,7]},{"type":"Token","kind":"WHITESPACE","start":[61,6,7],"end":[62,6,8]},{"type":"Token","kind":"STRING","start":[62,6,8],"end":[64,6,10]},{"type":"Token","kind":"R_PAREN","start":[64,6,10],"end":[65,6,11]}]}]}]},{"type":"Token","kind":"SEMICOLON","start":[65,6,11],"end":[66,6,12]}]},{"type":"Token","kind":"WHITESPACE","start":[66,6,12],"end":[67,7,0]},{"type":"Token","kind":"R_CURLY","start":[67,7,0],"end":[68,7,1]}]}]}]}]}"#
238            ]],
239        );
240
241        // With a raw string
242        check(
243            r###"fn test() {
244    assert!(r$0#"
245fn foo() {
246}
247fn bar() {
248}"$0#, "");
249}"###,
250            expect![[
251                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252            ]],
253        );
254    }
255}
ide/view_syntax_tree.rs

ide/
view_syntax_tree.rs
