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 { 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, in_string: Option, } struct InStringCtx { offset: u32, marker_positions: Vec, } #[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_CU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]], ); // With a raw string check( r###"fn test() { assert!(r#" $0fn foo() { }$0 fn bar() { } "#, ""); }"###, expect![[ 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