Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide/src/view_syntax_tree.rs')
| -rw-r--r-- | crates/ide/src/view_syntax_tree.rs | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/crates/ide/src/view_syntax_tree.rs b/crates/ide/src/view_syntax_tree.rs new file mode 100644 index 0000000000..218ee15a7d --- /dev/null +++ b/crates/ide/src/view_syntax_tree.rs @@ -0,0 +1,226 @@ +use hir::Semantics; +use ide_db::{FileId, RootDatabase}; +use span::TextRange; +use stdx::format_to; +use syntax::{ + ast::{self, IsString}, + AstNode, AstToken, NodeOrToken, SourceFile, SyntaxNode, SyntaxToken, WalkEvent, +}; + +// 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 parse = sema.parse_guess_edition(file_id); + syntax_node_to_json(parse.syntax(), None) +} + +fn syntax_node_to_json(node: &SyntaxNode, ctx: Option<InStringCtx>) -> 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 { + Some(ctx) => { + let inner_start: u32 = it.text_range().start().into(); + let inner_end: u32 = it.text_range().end().into(); + + let mut true_start = inner_start + ctx.offset; + let mut true_end = inner_end + ctx.offset; + for pos in &ctx.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":{:?},"iend":{:?}"#, + it.text_range().start(), + it.text_range().end() + ), + ) + } + None => (it.text_range(), "".to_owned()), + }; + let start = text_range.start(); + let end = 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) { + 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 +} + +fn parse_rust_string(token: SyntaxToken) -> 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; + } + + Some(syntax_node_to_json( + node, + Some(InStringCtx { + offset: string_node.text_range_between_quotes()?.start().into(), + marker_positions, + }), + )) +} + +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,"end":11,"children":[{"type":"Node","kind":"FN","start":0,"end":11,"children":[{"type":"Token","kind":"FN_KW","start":0,"end":2},{"type":"Token","kind":"WHITESPACE","start":2,"end":3},{"type":"Node","kind":"NAME","start":3,"end":6,"children":[{"type":"Token","kind":"IDENT","start":3,"end":6}]},{"type":"Node","kind":"PARAM_LIST","start":6,"end":8,"children":[{"type":"Token","kind":"L_PAREN","start":6,"end":7},{"type":"Token","kind":"R_PAREN","start":7,"end":8}]},{"type":"Token","kind":"WHITESPACE","start":8,"end":9},{"type":"Node","kind":"BLOCK_EXPR","start":9,"end":11,"children":[{"type":"Node","kind":"STMT_LIST","start":9,"end":11,"children":[{"type":"Token","kind":"L_CURLY","start":9,"end":10},{"type":"Token","kind":"R_CURLY","start":10,"end":11}]}]}]}]}"# + ]], + ); + + check( + r#" +fn test() { + assert!(" + fn foo() { + } + ", ""); +}"#, + expect![[ + r#"{"type":"Node","kind":"SOURCE_FILE","start":0,"end":60,"children":[{"type":"Node","kind":"FN","start":0,"end":60,"children":[{"type":"Token","kind":"FN_KW","start":0,"end":2},{"type":"Token","kind":"WHITESPACE","start":2,"end":3},{"type":"Node","kind":"NAME","start":3,"end":7,"children":[{"type":"Token","kind":"IDENT","start":3,"end":7}]},{"type":"Node","kind":"PARAM_LIST","start":7,"end":9,"children":[{"type":"Token","kind":"L_PAREN","start":7,"end":8},{"type":"Token","kind":"R_PAREN","start":8,"end":9}]},{"type":"Token","kind":"WHITESPACE","start":9,"end":10},{"type":"Node","kind":"BLOCK_EXPR","start":10,"end":60,"children":[{"type":"Node","kind":"STMT_LIST","start":10,"end":60,"children":[{"type":"Token","kind":"L_CURLY","start":10,"end":11},{"type":"Token","kind":"WHITESPACE","start":11,"end":16},{"type":"Node","kind":"EXPR_STMT","start":16,"end":58,"children":[{"type":"Node","kind":"MACRO_EXPR","start":16,"end":57,"children":[{"type":"Node","kind":"MACRO_CALL","start":16,"end":57,"children":[{"type":"Node","kind":"PATH","start":16,"end":22,"children":[{"type":"Node","kind":"PATH_SEGMENT","start":16,"end":22,"children":[{"type":"Node","kind":"NAME_REF","start":16,"end":22,"children":[{"type":"Token","kind":"IDENT","start":16,"end":22}]}]}]},{"type":"Token","kind":"BANG","start":22,"end":23},{"type":"Node","kind":"TOKEN_TREE","start":23,"end":57,"children":[{"type":"Token","kind":"L_PAREN","start":23,"end":24},{"type":"Node","kind":"STRING","start":24,"end":52,"children":[{"type":"Node","kind":"SOURCE_FILE","start":25,"end":51,"istart":0,"iend":26,"children":[{"type":"Token","kind":"WHITESPACE","start":25,"end":30,"istart":0,"iend":5},{"type":"Node","kind":"FN","start":30,"end":46,"istart":5,"iend":21,"children":[{"type":"Token","kind":"FN_KW","start":30,"end":32,"istart":5,"iend":7},{"type":"Token","kind":"WHITESPACE","start":32,"end":33,"istart":7,"iend":8},{"type":"Node","kind":"NAME","start":33,"end":36,"istart":8,"iend":11,"children":[{"type":"Token","kind":"IDENT","start":33,"end":36,"istart":8,"iend":11}]},{"type":"Node","kind":"PARAM_LIST","start":36,"end":38,"istart":11,"iend":13,"children":[{"type":"Token","kind":"L_PAREN","start":36,"end":37,"istart":11,"iend":12},{"type":"Token","kind":"R_PAREN","start":37,"end":38,"istart":12,"iend":13}]},{"type":"Token","kind":"WHITESPACE","start":38,"end":39,"istart":13,"iend":14},{"type":"Node","kind":"BLOCK_EXPR","start":39,"end":46,"istart":14,"iend":21,"children":[{"type":"Node","kind":"STMT_LIST","start":39,"end":46,"istart":14,"iend":21,"children":[{"type":"Token","kind":"L_CURLY","start":39,"end":40,"istart":14,"iend":15},{"type":"Token","kind":"WHITESPACE","start":40,"end":45,"istart":15,"iend":20},{"type":"Token","kind":"R_CURLY","start":45,"end":46,"istart":20,"iend":21}]}]}]},{"type":"Token","kind":"WHITESPACE","start":46,"end":51,"istart":21,"iend":26}]}]},{"type":"Token","kind":"COMMA","start":52,"end":53},{"type":"Token","kind":"WHITESPACE","start":53,"end":54},{"type":"Token","kind":"STRING","start":54,"end":56},{"type":"Token","kind":"R_PAREN","start":56,"end":57}]}]}]},{"type":"Token","kind":"SEMICOLON","start":57,"end":58}]},{"type":"Token","kind":"WHITESPACE","start":58,"end":59},{"type":"Token","kind":"R_CURLY","start":59,"end":60}]}]}]}]}"# + ]], + ) + } + + #[test] + fn view_syntax_tree_inside_string() { + check( + r#"fn test() { + assert!(" +$0fn foo() { +}$0 +fn bar() { +} + ", ""); 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