use crate::{Assist, AssistCtx, AssistId}; use ast::LoopBodyOwner; use ra_fmt::unwrap_trivial_block; use ra_syntax::{ast, match_ast, AstNode, TextRange, T}; // Assist: unwrap_block // // This assist removes if...else, for, while and loop control statements to just keep the body. // // ``` // fn foo() { // if true {<|> // println!("foo"); // } // } // ``` // -> // ``` // fn foo() { // println!("foo"); // } // ``` pub(crate) fn unwrap_block(ctx: AssistCtx) -> Option { let l_curly_token = ctx.find_token_at_offset(T!['{'])?; let block = ast::BlockExpr::cast(l_curly_token.parent())?; let parent = block.syntax().parent()?; let (expr, expr_to_unwrap) = match_ast! { match parent { ast::IfExpr(if_expr) => { let expr_to_unwrap = if_expr.blocks().find_map(|expr| extract_expr(ctx.frange.range, expr)); let expr_to_unwrap = expr_to_unwrap?; // Find if we are in a else if block let ancestor = if_expr.syntax().parent().and_then(ast::IfExpr::cast); match ancestor { None => (ast::Expr::IfExpr(if_expr), expr_to_unwrap), Some(ancestor) => (ast::Expr::IfExpr(ancestor), expr_to_unwrap), } }, ast::ForExpr(for_expr) => { let block_expr = for_expr.loop_body()?; let expr_to_unwrap = extract_expr(ctx.frange.range, block_expr)?; (ast::Expr::ForExpr(for_expr), expr_to_unwrap) }, ast::WhileExpr(while_expr) => { let block_expr = while_expr.loop_body()?; let expr_to_unwrap = extract_expr(ctx.frange.range, block_expr)?; (ast::Expr::WhileExpr(while_expr), expr_to_unwrap) }, ast::LoopExpr(loop_expr) => { let block_expr = loop_expr.loop_body()?; let expr_to_unwrap = extract_expr(ctx.frange.range, block_expr)?; (ast::Expr::LoopExpr(loop_expr), expr_to_unwrap) }, _ => return None, } }; ctx.add_assist(AssistId("unwrap_block"), "Unwrap block", |edit| { edit.set_cursor(expr.syntax().text_range().start()); edit.target(expr_to_unwrap.syntax().text_range()); let pat_start: &[_] = &[' ', '{', '\n']; let expr_to_unwrap = expr_to_unwrap.to_string(); let expr_string = expr_to_unwrap.trim_start_matches(pat_start); let mut expr_string_lines: Vec<&str> = expr_string.lines().collect(); expr_string_lines.pop(); // Delete last line let expr_string = expr_string_lines .into_iter() .map(|line| line.replacen(" ", "", 1)) // Delete indentation .collect::>() .join("\n"); edit.replace(expr.syntax().text_range(), expr_string); }) } fn extract_expr(cursor_range: TextRange, block: ast::BlockExpr) -> Option { let cursor_in_range = block.l_curly_token()?.text_range().contains_range(cursor_range); if cursor_in_range { Some(unwrap_trivial_block(block)) } else { None } } #[cfg(test)] mod tests { use crate::tests::{check_assist, check_assist_not_applicable}; use super::*; #[test] fn simple_if() { check_assist( unwrap_block, r#" fn main() { bar(); if true {<|> foo(); //comment bar(); } else { println!("bar"); } } "#, r#" fn main() { bar(); <|>foo(); //comment bar(); } "#, ); } #[test] fn simple_if_else() { check_assist( unwrap_block, r#" fn main() { bar(); if true { foo(); //comment bar(); } else {<|> println!("bar"); } } "#, r#" fn main() { bar(); <|>println!("bar"); } "#, ); } #[test] fn simple_if_else_if() { check_assist( unwrap_block, r#" fn main() { //bar(); if true { println!("true"); //comment //bar(); } else if false {<|> println!("bar"); } else { println!("foo"); } } "#, r#" fn main() { //bar(); <|>println!("bar"); } "#, ); } #[test] fn simple_if_bad_cursor_position() { check_assist_not_applicable( unwrap_block, r#" fn main() { bar();<|> if true { foo(); //comment bar(); } else { println!("bar"); } } "#, ); } #[test] fn simple_for() { check_assist( unwrap_block, r#" fn main() { for i in 0..5 {<|> if true { foo(); //comment bar(); } else { println!("bar"); } } } "#, r#" fn main() { <|>if true { foo(); //comment bar(); } else { println!("bar"); } } "#, ); } #[test] fn simple_if_in_for() { check_assist( unwrap_block, r#" fn main() { for i in 0..5 { if true {<|> foo(); //comment bar(); } else { println!("bar"); } } } "#, r#" fn main() { for i in 0..5 { <|>foo(); //comment bar(); } } "#, ); } #[test] fn simple_loop() { check_assist( unwrap_block, r#" fn main() { loop {<|> if true { foo(); //comment bar(); } else { println!("bar"); } } } "#, r#" fn main() { <|>if true { foo(); //comment bar(); } else { println!("bar"); } } "#, ); } #[test] fn simple_while() { check_assist( unwrap_block, r#" fn main() { while true {<|> if true { foo(); //comment bar(); } else { println!("bar"); } } } "#, r#" fn main() { <|>if true { foo(); //comment bar(); } else { println!("bar"); } } "#, ); } #[test] fn simple_if_in_while_bad_cursor_position() { check_assist_not_applicable( unwrap_block, r#" fn main() { while true { if true { foo();<|> //comment bar(); } else { println!("bar"); } } } "#, ); } }