2 ast::{self, edit::AstNodeEdit, make},
8 assist_context::{AssistContext, Assists},
12 // Assist: pull_assignment_up
14 // Extracts variable assignment to outside an if or match statement.
39 pub(crate) fn pull_assignment_up(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
40 let assign_expr = ctx.find_node_at_offset::<ast::BinExpr>()?;
41 let name_expr = if assign_expr.op_kind()? == ast::BinOp::Assignment {
47 let (old_stmt, new_stmt) = if let Some(if_expr) = ctx.find_node_at_offset::<ast::IfExpr>() {
49 ast::Expr::cast(if_expr.syntax().to_owned())?,
50 exprify_if(&if_expr, &ctx.sema, &name_expr)?.indent(if_expr.indent_level()),
52 } else if let Some(match_expr) = ctx.find_node_at_offset::<ast::MatchExpr>() {
54 ast::Expr::cast(match_expr.syntax().to_owned())?,
55 exprify_match(&match_expr, &ctx.sema, &name_expr)?,
61 let expr_stmt = make::expr_stmt(new_stmt);
64 AssistId("pull_assignment_up", AssistKind::RefactorExtract),
66 old_stmt.syntax().text_range(),
68 edit.replace(old_stmt.syntax().text_range(), format!("{} = {};", name_expr, expr_stmt));
74 match_expr: &ast::MatchExpr,
75 sema: &hir::Semantics<ide_db::RootDatabase>,
77 ) -> Option<ast::Expr> {
78 let new_arm_list = match_expr
82 if let ast::Expr::BlockExpr(block) = arm.expr()? {
83 let new_block = exprify_block(&block, sema, name)?.indent(block.indent_level());
84 Some(arm.replace_descendant(block, new_block))
89 .collect::<Option<Vec<_>>>()?;
90 let new_arm_list = match_expr
92 .replace_descendants(match_expr.match_arm_list()?.arms().zip(new_arm_list));
93 Some(make::expr_match(match_expr.expr()?, new_arm_list))
97 statement: &ast::IfExpr,
98 sema: &hir::Semantics<ide_db::RootDatabase>,
100 ) -> Option<ast::Expr> {
101 let then_branch = exprify_block(&statement.then_branch()?, sema, name)?;
102 let else_branch = match statement.else_branch()? {
103 ast::ElseBranch::Block(ref block) => {
104 ast::ElseBranch::Block(exprify_block(block, sema, name)?)
106 ast::ElseBranch::IfExpr(expr) => {
107 mark::hit!(test_pull_assignment_up_chained_if);
108 ast::ElseBranch::IfExpr(ast::IfExpr::cast(
109 exprify_if(&expr, sema, name)?.syntax().to_owned(),
113 Some(make::expr_if(statement.condition()?, then_branch, Some(else_branch)))
117 block: &ast::BlockExpr,
118 sema: &hir::Semantics<ide_db::RootDatabase>,
120 ) -> Option<ast::BlockExpr> {
121 if block.tail_expr().is_some() {
125 let mut stmts: Vec<_> = block.statements().collect();
126 let stmt = stmts.pop()?;
128 if let ast::Stmt::ExprStmt(stmt) = stmt {
129 if let ast::Expr::BinExpr(expr) = stmt.expr()? {
130 if expr.op_kind()? == ast::BinOp::Assignment && is_equivalent(sema, &expr.lhs()?, name)
132 // The last statement in the block is an assignment to the name we want
133 return Some(make::block_expr(stmts, Some(expr.rhs()?)));
141 sema: &hir::Semantics<ide_db::RootDatabase>,
145 match (expr0, expr1) {
146 (ast::Expr::FieldExpr(field_expr0), ast::Expr::FieldExpr(field_expr1)) => {
147 mark::hit!(test_pull_assignment_up_field_assignment);
148 sema.resolve_field(field_expr0) == sema.resolve_field(field_expr1)
150 (ast::Expr::PathExpr(path0), ast::Expr::PathExpr(path1)) => {
151 let path0 = path0.path();
152 let path1 = path1.path();
153 if let (Some(path0), Some(path1)) = (path0, path1) {
154 sema.resolve_path(&path0) == sema.resolve_path(&path1)
159 (ast::Expr::PrefixExpr(prefix0), ast::Expr::PrefixExpr(prefix1))
160 if prefix0.op_kind() == Some(ast::PrefixOp::Deref)
161 && prefix1.op_kind() == Some(ast::PrefixOp::Deref) =>
163 mark::hit!(test_pull_assignment_up_deref);
164 if let (Some(prefix0), Some(prefix1)) = (prefix0.expr(), prefix1.expr()) {
165 is_equivalent(sema, &prefix0, &prefix1)
178 use crate::tests::{check_assist, check_assist_not_applicable};
181 fn test_pull_assignment_up_if() {
208 fn test_pull_assignment_up_match() {
247 fn test_pull_assignment_up_not_last_not_applicable() {
248 check_assist_not_applicable(
265 fn test_pull_assignment_up_chained_if() {
266 mark::check!(test_pull_assignment_up_chained_if);
297 fn test_pull_assignment_up_retains_stmts() {
328 fn pull_assignment_up_let_stmt_not_applicable() {
329 check_assist_not_applicable(
345 fn pull_assignment_up_if_missing_assigment_not_applicable() {
346 check_assist_not_applicable(
360 fn pull_assignment_up_match_missing_assigment_not_applicable() {
361 check_assist_not_applicable(
381 fn test_pull_assignment_up_field_assignment() {
382 mark::check!(test_pull_assignment_up_field_assignment);
413 fn test_pull_assignment_up_deref() {
414 mark::check!(test_pull_assignment_up_deref);