use std::mem; use ra_syntax::{ TextUnit, TextRange, SyntaxNodeRef, File, AstNode, SyntaxKind, ast, algo::{ find_covering_node, find_leaf_at_offset, LeafAtOffset, }, text_utils::{intersect, contains_offset_nonstrict}, SyntaxKind::*, }; use {LocalEdit, EditBuilder, find_node_at_offset}; pub fn join_lines(file: &File, range: TextRange) -> LocalEdit { let range = if range.is_empty() { let syntax = file.syntax(); let text = syntax.text().slice(range.start()..); let pos = match text.find('\n') { None => return LocalEdit { edit: EditBuilder::new().finish(), cursor_position: None }, Some(pos) => pos }; TextRange::offset_len( range.start() + pos, TextUnit::of_char('\n'), ) } else { range }; let node = find_covering_node(file.syntax(), range); let mut edit = EditBuilder::new(); for node in node.descendants() { let text = match node.leaf_text() { Some(text) => text, None => continue, }; let range = match intersect(range, node.range()) { Some(range) => range, None => continue, } - node.range().start(); for (pos, _) in text[range].bytes().enumerate().filter(|&(_, b)| b == b'\n') { let pos: TextUnit = (pos as u32).into(); let off = node.range().start() + range.start() + pos; if !edit.invalidates_offset(off) { remove_newline(&mut edit, node, text.as_str(), off); } } } LocalEdit { edit: edit.finish(), cursor_position: None, } } pub fn on_enter(file: &File, offset: TextUnit) -> Option { let comment = find_leaf_at_offset(file.syntax(), offset).left_biased().filter(|it| it.kind() == COMMENT)?; let prefix = comment_preffix(comment)?; if offset < comment.range().start() + TextUnit::of_str(prefix) { return None; } let indent = node_indent(file, comment)?; let inserted = format!("\n{}{}", indent, prefix); let cursor_position = offset + TextUnit::of_str(&inserted); let mut edit = EditBuilder::new(); edit.insert(offset, inserted); Some(LocalEdit { edit: edit.finish(), cursor_position: Some(cursor_position), }) } fn comment_preffix(comment: SyntaxNodeRef) -> Option<&'static str> { let text = comment.leaf_text().unwrap(); let res = if text.starts_with("///") { "/// " } else if text.starts_with("//!") { "//! " } else if text.starts_with("//") { "// " } else { return None; }; Some(res) } fn node_indent<'a>(file: &'a File, node: SyntaxNodeRef) -> Option<&'a str> { let ws = match find_leaf_at_offset(file.syntax(), node.range().start()) { LeafAtOffset::Between(l, r) => { assert!(r == node); l } LeafAtOffset::Single(n) => { assert!(n == node); return Some("") } LeafAtOffset::None => unreachable!(), }; if ws.kind() != WHITESPACE { return None; } let text = ws.leaf_text().unwrap(); let pos = text.as_str().rfind('\n').map(|it| it + 1).unwrap_or(0); Some(&text[pos..]) } pub fn on_eq_typed(file: &File, offset: TextUnit) -> Option { let let_stmt: ast::LetStmt = find_node_at_offset(file.syntax(), offset)?; if let_stmt.has_semi() { return None; } if let Some(expr) = let_stmt.initializer() { let expr_range = expr.syntax().range(); if contains_offset_nonstrict(expr_range, offset) && offset != expr_range.start() { return None; } if file.syntax().text().slice(offset..expr_range.start()).contains('\n') { return None; } } else { return None; } let offset = let_stmt.syntax().range().end(); let mut edit = EditBuilder::new(); edit.insert(offset, ";".to_string()); Some(LocalEdit { edit: edit.finish(), cursor_position: None, }) } fn remove_newline( edit: &mut EditBuilder, node: SyntaxNodeRef, node_text: &str, offset: TextUnit, ) { if node.kind() == WHITESPACE && node_text.bytes().filter(|&b| b == b'\n').count() == 1 { // Special case that turns something like: // // ``` // my_function({<|> // // }) // ``` // // into `my_function()` if join_single_expr_block(edit, node).is_some() { return } if let (Some(prev), Some(next)) = (node.prev_sibling(), node.next_sibling()) { let range = TextRange::from_to(prev.range().start(), node.range().end()); if is_trailing_comma(prev.kind(), next.kind()) { // Removes: trailing comma, newline (incl. surrounding whitespace) edit.delete(range); } else if no_space_required(prev.kind(), next.kind()) { // Removes: newline (incl. surrounding whitespace) edit.delete(node.range()); } else if prev.kind() == COMMA && next.kind() == R_CURLY { // Removes: comma, newline (incl. surrounding whitespace) // Adds: a single whitespace edit.replace(range, " ".to_string()); } else if prev.kind() == COMMENT && next.kind() == COMMENT { // Removes: newline (incl. surrounding whitespace), start of the next comment // FIXME: I guess it is safe to unwrap here? A comment always has text, right? let comment_text = next.leaf_text().unwrap().as_str(); let comment_start_length = comment_start_length(comment_text); if let Some(newline_pos) = comment_text.find('\n') { // Special case for multi-line c-like comments: join the comment content but // keep the leading `/*` let newline_offset = next.range().start() + TextUnit::from(newline_pos as u32) + TextUnit::of_char('\n'); edit.insert(newline_offset, "/*".to_string()); edit.delete(TextRange::from_to( node.range().start(), next.range().start() + comment_start_length )); } else { // Single-line comments edit.delete(TextRange::from_to( node.range().start(), next.range().start() + comment_start_length )); } } else { // Remove newline but add a computed amount of whitespace characters edit.replace( node.range(), compute_ws(prev, next).to_string(), ); } return; } } // FIXME: do we ever reach this point? What does it mean to be here? I think we should document it let suff = &node_text[TextRange::from_to( offset - node.range().start() + TextUnit::of_char('\n'), TextUnit::of_str(node_text), )]; let spaces = suff.bytes().take_while(|&b| b == b' ').count(); edit.replace( TextRange::offset_len(offset, ((spaces + 1) as u32).into()), " ".to_string(), ); } // Return the start length of the comment (e.g. 2 for `//` and 3 for `//!`) fn comment_start_length(_text: &str) -> TextUnit { // TODO: use the parser here instead of reimplementing comment parsing? // Otherwise, reimplement comment parsing :) return TextUnit::from(2); } fn is_trailing_comma(left: SyntaxKind, right: SyntaxKind) -> bool { match (left, right) { (COMMA, R_PAREN) | (COMMA, R_BRACK) => true, _ => false } } fn no_space_required(left: SyntaxKind, right: SyntaxKind) -> bool { match (left, right) { (_, DOT) => true, _ => false } } fn join_single_expr_block( edit: &mut EditBuilder, node: SyntaxNodeRef, ) -> Option<()> { let block = ast::Block::cast(node.parent()?)?; let block_expr = ast::BlockExpr::cast(block.syntax().parent()?)?; let expr = single_expr(block)?; edit.replace( block_expr.syntax().range(), expr.syntax().text().to_string(), ); Some(()) } fn single_expr(block: ast::Block) -> Option { let mut res = None; for child in block.syntax().children() { if let Some(expr) = ast::Expr::cast(child) { if expr.syntax().text().contains('\n') { return None; } if mem::replace(&mut res, Some(expr)).is_some() { return None; } } else { match child.kind() { WHITESPACE | L_CURLY | R_CURLY => (), _ => return None, } } } res } fn compute_ws(left: SyntaxNodeRef, right: SyntaxNodeRef) -> &'static str { match left.kind() { L_PAREN | L_BRACK => return "", _ => (), } match right.kind() { R_PAREN | R_BRACK => return "", _ => (), } " " } #[cfg(test)] mod tests { use super::*; use test_utils::{check_action, extract_range, extract_offset, add_cursor}; fn check_join_lines(before: &str, after: &str) { check_action(before, after, |file, offset| { let range = TextRange::offset_len(offset, 0.into()); let res = join_lines(file, range); Some(res) }) } #[test] fn test_join_lines_comma() { check_join_lines(r" fn foo() { <|>foo(1, ) } ", r" fn foo() { <|>foo(1) } "); } #[test] fn test_join_lines_lambda_block() { check_join_lines(r" pub fn reparse(&self, edit: &AtomEdit) -> File { <|>self.incremental_reparse(edit).unwrap_or_else(|| { self.full_reparse(edit) }) } ", r" pub fn reparse(&self, edit: &AtomEdit) -> File { <|>self.incremental_reparse(edit).unwrap_or_else(|| self.full_reparse(edit)) } "); } #[test] fn test_join_lines_block() { check_join_lines(r" fn foo() { foo(<|>{ 92 }) }", r" fn foo() { foo(<|>92) }"); } fn check_join_lines_sel(before: &str, after: &str) { let (sel, before) = extract_range(before); let file = File::parse(&before); let result = join_lines(&file, sel); let actual = result.edit.apply(&before); assert_eq_text!(after, &actual); } #[test] fn test_join_lines_selection_fn_args() { check_join_lines_sel(r" fn foo() { <|>foo(1, 2, 3, <|>) } ", r" fn foo() { foo(1, 2, 3) } "); } #[test] fn test_join_lines_selection_struct() { check_join_lines_sel(r" struct Foo <|>{ f: u32, }<|> ", r" struct Foo { f: u32 } "); } #[test] fn test_join_lines_selection_dot_chain() { check_join_lines_sel(r" fn foo() { join(<|>type_params.type_params() .filter_map(|it| it.name()) .map(|it| it.text())<|>) }", r" fn foo() { join(type_params.type_params().filter_map(|it| it.name()).map(|it| it.text())) }"); } #[test] fn test_join_lines_selection_lambda_block_body() { check_join_lines_sel(r" pub fn handle_find_matching_brace() { params.offsets .map(|offset| <|>{ world.analysis().matching_brace(&file, offset).unwrap_or(offset) }<|>) .collect(); }", r" pub fn handle_find_matching_brace() { params.offsets .map(|offset| world.analysis().matching_brace(&file, offset).unwrap_or(offset)) .collect(); }"); } #[test] fn test_on_eq_typed() { fn do_check(before: &str, after: &str) { let (offset, before) = extract_offset(before); let file = File::parse(&before); let result = on_eq_typed(&file, offset).unwrap(); let actual = result.edit.apply(&before); assert_eq_text!(after, &actual); } // do_check(r" // fn foo() { // let foo =<|> // } // ", r" // fn foo() { // let foo =; // } // "); do_check(r" fn foo() { let foo =<|> 1 + 1 } ", r" fn foo() { let foo = 1 + 1; } "); // do_check(r" // fn foo() { // let foo =<|> // let bar = 1; // } // ", r" // fn foo() { // let foo =; // let bar = 1; // } // "); } #[test] fn test_on_enter() { fn apply_on_enter(before: &str) -> Option { let (offset, before) = extract_offset(before); let file = File::parse(&before); let result = on_enter(&file, offset)?; let actual = result.edit.apply(&before); let actual = add_cursor(&actual, result.cursor_position.unwrap()); Some(actual) } fn do_check(before: &str, after: &str) { let actual = apply_on_enter(before).unwrap(); assert_eq_text!(after, &actual); } fn do_check_noop(text: &str) { assert!(apply_on_enter(text).is_none()) } do_check(r" /// Some docs<|> fn foo() { } ", r" /// Some docs /// <|> fn foo() { } "); do_check(r" impl S { /// Some<|> docs. fn foo() {} } ", r" impl S { /// Some /// <|> docs. fn foo() {} } "); do_check_noop(r"<|>//! docz"); } }