511 lines
10 KiB
Rust
511 lines
10 KiB
Rust
use syntax::{
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ast::{self, make},
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ted, AstNode,
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};
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use crate::{
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assist_context::{AssistContext, Assists},
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AssistId, AssistKind,
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};
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// Assist: pull_assignment_up
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//
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// Extracts variable assignment to outside an if or match statement.
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//
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// ```
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// fn main() {
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// let mut foo = 6;
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//
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// if true {
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// $0foo = 5;
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// } else {
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// foo = 4;
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// }
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// }
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// ```
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// ->
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// ```
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// fn main() {
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// let mut foo = 6;
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//
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// foo = if true {
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// 5
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// } else {
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// 4
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// };
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// }
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// ```
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pub(crate) fn pull_assignment_up(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
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let assign_expr = ctx.find_node_at_offset::<ast::BinExpr>()?;
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let op_kind = assign_expr.op_kind()?;
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if op_kind != ast::BinOp::Assignment {
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cov_mark::hit!(test_cant_pull_non_assignments);
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return None;
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}
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let mut collector = AssignmentsCollector {
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sema: &ctx.sema,
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common_lhs: assign_expr.lhs()?,
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assignments: Vec::new(),
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};
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let tgt: ast::Expr = if let Some(if_expr) = ctx.find_node_at_offset::<ast::IfExpr>() {
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collector.collect_if(&if_expr)?;
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if_expr.into()
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} else if let Some(match_expr) = ctx.find_node_at_offset::<ast::MatchExpr>() {
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collector.collect_match(&match_expr)?;
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match_expr.into()
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} else {
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return None;
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};
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if let Some(parent) = tgt.syntax().parent() {
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if matches!(parent.kind(), syntax::SyntaxKind::BIN_EXPR | syntax::SyntaxKind::LET_STMT) {
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return None;
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}
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}
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acc.add(
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AssistId("pull_assignment_up", AssistKind::RefactorExtract),
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"Pull assignment up",
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tgt.syntax().text_range(),
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move |edit| {
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let assignments: Vec<_> = collector
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.assignments
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.into_iter()
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.map(|(stmt, rhs)| (edit.make_mut(stmt), rhs.clone_for_update()))
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.collect();
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let tgt = edit.make_mut(tgt);
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for (stmt, rhs) in assignments {
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let mut stmt = stmt.syntax().clone();
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if let Some(parent) = stmt.parent() {
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if ast::ExprStmt::cast(parent.clone()).is_some() {
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stmt = parent.clone();
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}
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}
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ted::replace(stmt, rhs.syntax());
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}
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let assign_expr = make::expr_assignment(collector.common_lhs, tgt.clone());
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let assign_stmt = make::expr_stmt(assign_expr);
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ted::replace(tgt.syntax(), assign_stmt.syntax().clone_for_update());
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},
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)
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}
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struct AssignmentsCollector<'a> {
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sema: &'a hir::Semantics<'a, ide_db::RootDatabase>,
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common_lhs: ast::Expr,
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assignments: Vec<(ast::BinExpr, ast::Expr)>,
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}
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impl<'a> AssignmentsCollector<'a> {
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fn collect_match(&mut self, match_expr: &ast::MatchExpr) -> Option<()> {
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for arm in match_expr.match_arm_list()?.arms() {
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match arm.expr()? {
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ast::Expr::BlockExpr(block) => self.collect_block(&block)?,
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ast::Expr::BinExpr(expr) => self.collect_expr(&expr)?,
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_ => return None,
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}
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}
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Some(())
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}
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fn collect_if(&mut self, if_expr: &ast::IfExpr) -> Option<()> {
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let then_branch = if_expr.then_branch()?;
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self.collect_block(&then_branch)?;
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match if_expr.else_branch()? {
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ast::ElseBranch::Block(block) => self.collect_block(&block),
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ast::ElseBranch::IfExpr(expr) => {
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cov_mark::hit!(test_pull_assignment_up_chained_if);
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self.collect_if(&expr)
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}
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}
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}
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fn collect_block(&mut self, block: &ast::BlockExpr) -> Option<()> {
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let last_expr = block.tail_expr().or_else(|| {
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if let ast::Stmt::ExprStmt(stmt) = block.statements().last()? {
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stmt.expr()
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} else {
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None
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}
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})?;
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if let ast::Expr::BinExpr(expr) = last_expr {
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return self.collect_expr(&expr);
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}
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None
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}
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fn collect_expr(&mut self, expr: &ast::BinExpr) -> Option<()> {
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if expr.op_kind()? == ast::BinOp::Assignment
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&& is_equivalent(self.sema, &expr.lhs()?, &self.common_lhs)
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{
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self.assignments.push((expr.clone(), expr.rhs()?));
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return Some(());
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}
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None
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}
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}
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fn is_equivalent(
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sema: &hir::Semantics<ide_db::RootDatabase>,
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expr0: &ast::Expr,
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expr1: &ast::Expr,
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) -> bool {
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match (expr0, expr1) {
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(ast::Expr::FieldExpr(field_expr0), ast::Expr::FieldExpr(field_expr1)) => {
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cov_mark::hit!(test_pull_assignment_up_field_assignment);
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sema.resolve_field(field_expr0) == sema.resolve_field(field_expr1)
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}
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(ast::Expr::PathExpr(path0), ast::Expr::PathExpr(path1)) => {
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let path0 = path0.path();
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let path1 = path1.path();
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if let (Some(path0), Some(path1)) = (path0, path1) {
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sema.resolve_path(&path0) == sema.resolve_path(&path1)
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} else {
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false
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}
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}
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(ast::Expr::PrefixExpr(prefix0), ast::Expr::PrefixExpr(prefix1))
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if prefix0.op_kind() == Some(ast::PrefixOp::Deref)
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&& prefix1.op_kind() == Some(ast::PrefixOp::Deref) =>
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{
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cov_mark::hit!(test_pull_assignment_up_deref);
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if let (Some(prefix0), Some(prefix1)) = (prefix0.expr(), prefix1.expr()) {
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is_equivalent(sema, &prefix0, &prefix1)
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} else {
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false
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}
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}
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_ => false,
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::tests::{check_assist, check_assist_not_applicable};
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#[test]
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fn test_pull_assignment_up_if() {
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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if true {
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$0a = 2;
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} else {
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a = 3;
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}
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}"#,
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r#"
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fn foo() {
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let mut a = 1;
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a = if true {
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2
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} else {
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3
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};
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}"#,
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);
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}
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#[test]
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fn test_pull_assignment_up_match() {
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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match 1 {
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1 => {
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$0a = 2;
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},
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2 => {
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a = 3;
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},
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3 => {
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a = 4;
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}
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}
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}"#,
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r#"
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fn foo() {
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let mut a = 1;
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a = match 1 {
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1 => {
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2
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},
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2 => {
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3
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},
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3 => {
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4
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}
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};
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}"#,
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);
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}
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#[test]
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fn test_pull_assignment_up_assignment_expressions() {
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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match 1 {
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1 => { $0a = 2; },
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2 => a = 3,
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3 => {
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a = 4
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}
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}
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}"#,
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r#"
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fn foo() {
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let mut a = 1;
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a = match 1 {
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1 => { 2 },
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2 => 3,
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3 => {
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4
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}
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};
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}"#,
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);
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}
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#[test]
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fn test_pull_assignment_up_not_last_not_applicable() {
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check_assist_not_applicable(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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if true {
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$0a = 2;
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b = a;
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} else {
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a = 3;
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}
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}"#,
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)
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}
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#[test]
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fn test_pull_assignment_up_chained_if() {
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cov_mark::check!(test_pull_assignment_up_chained_if);
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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if true {
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$0a = 2;
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} else if false {
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a = 3;
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} else {
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a = 4;
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}
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}"#,
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r#"
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fn foo() {
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let mut a = 1;
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a = if true {
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2
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} else if false {
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3
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} else {
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4
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};
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}"#,
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);
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}
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#[test]
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fn test_pull_assignment_up_retains_stmts() {
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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if true {
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let b = 2;
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$0a = 2;
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} else {
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let b = 3;
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a = 3;
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}
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}"#,
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r#"
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fn foo() {
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let mut a = 1;
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a = if true {
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let b = 2;
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2
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} else {
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let b = 3;
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3
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};
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}"#,
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)
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}
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#[test]
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fn pull_assignment_up_let_stmt_not_applicable() {
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check_assist_not_applicable(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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let b = if true {
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$0a = 2
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} else {
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a = 3
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};
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}"#,
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)
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}
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#[test]
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fn pull_assignment_up_if_missing_assigment_not_applicable() {
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check_assist_not_applicable(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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if true {
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$0a = 2;
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} else {}
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}"#,
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)
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}
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#[test]
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fn pull_assignment_up_match_missing_assigment_not_applicable() {
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check_assist_not_applicable(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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match 1 {
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1 => {
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$0a = 2;
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},
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2 => {
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a = 3;
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},
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3 => {},
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}
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}"#,
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)
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}
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#[test]
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fn test_pull_assignment_up_field_assignment() {
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cov_mark::check!(test_pull_assignment_up_field_assignment);
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check_assist(
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pull_assignment_up,
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r#"
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struct A(usize);
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fn foo() {
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let mut a = A(1);
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if true {
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$0a.0 = 2;
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} else {
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a.0 = 3;
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}
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}"#,
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r#"
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struct A(usize);
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fn foo() {
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let mut a = A(1);
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a.0 = if true {
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2
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} else {
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3
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};
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}"#,
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)
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}
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#[test]
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fn test_pull_assignment_up_deref() {
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cov_mark::check!(test_pull_assignment_up_deref);
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check_assist(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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let b = &mut a;
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if true {
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$0*b = 2;
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} else {
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*b = 3;
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}
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}
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"#,
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r#"
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fn foo() {
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let mut a = 1;
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let b = &mut a;
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*b = if true {
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2
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} else {
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3
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};
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}
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"#,
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)
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}
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#[test]
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fn test_cant_pull_non_assignments() {
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cov_mark::check!(test_cant_pull_non_assignments);
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check_assist_not_applicable(
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pull_assignment_up,
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r#"
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fn foo() {
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let mut a = 1;
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let b = &mut a;
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if true {
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$0*b + 2;
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} else {
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*b + 3;
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}
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}
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"#,
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)
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}
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}
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