| use hir::Semantics; |
| use ide_db::{ |
| FileId, LineIndexDatabase, RootDatabase, |
| line_index::{LineCol, LineIndex}, |
| }; |
| use span::{TextRange, TextSize}; |
| use stdx::format_to; |
| use syntax::{ |
| AstNode, AstToken, NodeOrToken, SourceFile, SyntaxNode, SyntaxToken, WalkEvent, |
| ast::{self, IsString}, |
| }; |
| use triomphe::Arc; |
| |
| // Feature: Show Syntax Tree |
| // |
| // Shows a tree view with the syntax tree of the current file |
| // |
| // | Editor | Panel Name | |
| // |---------|-------------| |
| // | VS Code | **Rust Syntax Tree** | |
| pub(crate) fn view_syntax_tree(db: &RootDatabase, file_id: FileId) -> String { |
| let sema = Semantics::new(db); |
| let line_index = db.line_index(file_id); |
| let parse = sema.parse_guess_edition(file_id); |
| |
| let ctx = SyntaxTreeCtx { line_index, in_string: None }; |
| |
| syntax_node_to_json(parse.syntax(), &ctx) |
| } |
| |
| fn syntax_node_to_json(node: &SyntaxNode, ctx: &SyntaxTreeCtx) -> String { |
| let mut result = String::new(); |
| for event in node.preorder_with_tokens() { |
| match event { |
| WalkEvent::Enter(it) => { |
| let kind = it.kind(); |
| let (text_range, inner_range_str) = match &ctx.in_string { |
| Some(in_string) => { |
| let start_pos = TextPosition::new(&ctx.line_index, it.text_range().start()); |
| let end_pos = TextPosition::new(&ctx.line_index, it.text_range().end()); |
| |
| let inner_start: u32 = it.text_range().start().into(); |
| let inner_end: u32 = it.text_range().start().into(); |
| |
| let mut true_start = inner_start + in_string.offset; |
| let mut true_end = inner_end + in_string.offset; |
| for pos in &in_string.marker_positions { |
| if *pos >= inner_end { |
| break; |
| } |
| |
| // We conditionally add to true_start in case |
| // the marker is between the start and end. |
| true_start += 2 * (*pos < inner_start) as u32; |
| true_end += 2; |
| } |
| |
| let true_range = TextRange::new(true_start.into(), true_end.into()); |
| |
| (true_range, format!(r#","istart":{start_pos},"iend":{end_pos}"#,)) |
| } |
| None => (it.text_range(), "".to_owned()), |
| }; |
| |
| let start = TextPosition::new(&ctx.line_index, text_range.start()); |
| let end = TextPosition::new(&ctx.line_index, text_range.end()); |
| |
| match it { |
| NodeOrToken::Node(_) => { |
| format_to!( |
| result, |
| r#"{{"type":"Node","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str},"children":["# |
| ); |
| } |
| NodeOrToken::Token(token) => { |
| let comma = if token.next_sibling_or_token().is_some() { "," } else { "" }; |
| match parse_rust_string(token, ctx) { |
| Some(parsed) => { |
| format_to!( |
| result, |
| r#"{{"type":"Node","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str},"children":[{parsed}]}}{comma}"# |
| ); |
| } |
| None => format_to!( |
| result, |
| r#"{{"type":"Token","kind":"{kind:?}","start":{start},"end":{end}{inner_range_str}}}{comma}"# |
| ), |
| } |
| } |
| } |
| } |
| WalkEvent::Leave(it) => match it { |
| NodeOrToken::Node(node) => { |
| let comma = if node.next_sibling_or_token().is_some() { "," } else { "" }; |
| format_to!(result, "]}}{comma}") |
| } |
| NodeOrToken::Token(_) => (), |
| }, |
| } |
| } |
| |
| result |
| } |
| |
| struct TextPosition { |
| offset: TextSize, |
| line: u32, |
| col: u32, |
| } |
| |
| impl std::fmt::Display for TextPosition { |
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
| write!(f, "[{:?},{},{}]", self.offset, self.line, self.col) |
| } |
| } |
| |
| impl TextPosition { |
| pub(crate) fn new(line_index: &LineIndex, offset: TextSize) -> Self { |
| let LineCol { line, col } = line_index.line_col(offset); |
| Self { offset, line, col } |
| } |
| } |
| |
| fn parse_rust_string(token: SyntaxToken, ctx: &SyntaxTreeCtx) -> Option<String> { |
| let string_node = ast::String::cast(token)?; |
| let text = string_node.value().ok()?; |
| |
| let mut trim_result = String::new(); |
| let mut marker_positions = Vec::new(); |
| let mut skipped = 0; |
| let mut last_end = 0; |
| for (start, part) in text.match_indices("$0") { |
| marker_positions.push((start - skipped) as u32); |
| trim_result.push_str(&text[last_end..start]); |
| skipped += part.len(); |
| last_end = start + part.len(); |
| } |
| trim_result.push_str(&text[last_end..text.len()]); |
| |
| let parsed = SourceFile::parse(&trim_result, span::Edition::CURRENT); |
| |
| if !parsed.errors().is_empty() { |
| return None; |
| } |
| |
| let node: &SyntaxNode = &parsed.syntax_node(); |
| |
| if node.children().count() == 0 { |
| // C'mon, you should have at least one node other than SOURCE_FILE |
| return None; |
| } |
| |
| let ctx = SyntaxTreeCtx { |
| line_index: ctx.line_index.clone(), |
| in_string: Some(InStringCtx { |
| offset: string_node.text_range_between_quotes()?.start().into(), |
| marker_positions, |
| }), |
| }; |
| |
| Some(syntax_node_to_json(node, &ctx)) |
| } |
| |
| struct SyntaxTreeCtx { |
| line_index: Arc<LineIndex>, |
| in_string: Option<InStringCtx>, |
| } |
| |
| struct InStringCtx { |
| offset: u32, |
| marker_positions: Vec<u32>, |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use expect_test::expect; |
| |
| use crate::fixture; |
| |
| fn check(#[rust_analyzer::rust_fixture] ra_fixture: &str, expect: expect_test::Expect) { |
| let (analysis, file_id) = fixture::file(ra_fixture); |
| let syn = analysis.view_syntax_tree(file_id).unwrap(); |
| expect.assert_eq(&syn) |
| } |
| |
| #[test] |
| fn view_syntax_tree() { |
| // Basic syntax |
| check( |
| r#"fn foo() {}"#, |
| expect![[ |
| 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]}]}]}]}]}"# |
| ]], |
| ); |
| |
| check( |
| r#" |
| fn test() { |
| assert!(" |
| fn foo() { |
| } |
| ", ""); |
| }"#, |
| expect![[ |
| 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]}]}]}]}]}"# |
| ]], |
| ) |
| } |
| |
| #[test] |
| fn view_syntax_tree_inside_string() { |
| check( |
| r#"fn test() { |
| assert!(" |
| $0fn foo() { |
| }$0 |
| fn bar() { |
| } |
| ", ""); |
| }"#, |
| expect![[ |
| 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]}]}]}]}]}"# |
| ]], |
| ); |
| |
| // With a raw string |
| check( |
| r###"fn test() { |
| assert!(r#" |
| $0fn foo() { |
| }$0 |
| fn bar() { |
| } |
| "#, ""); |
| }"###, |
| expect![[ |
| 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|
| ]], |
| ); |
| |
| // With a raw string |
| check( |
| r###"fn test() { |
| assert!(r$0#" |
| fn foo() { |
| } |
| fn bar() { |
| }"$0#, ""); |
| }"###, |
| expect![[ |
| 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|
| ]], |
| ); |
| } |
| } |
