110 lines
2.8 KiB
Rust
110 lines
2.8 KiB
Rust
use ra_syntax::{
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ast::{self, AstNode},
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T,
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};
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use crate::{
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assist_context::{AssistContext, Assists},
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utils::invert_boolean_expression,
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AssistId,
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};
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// Assist: invert_if
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//
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// Apply invert_if
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// This transforms if expressions of the form `if !x {A} else {B}` into `if x {B} else {A}`
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// This also works with `!=`. This assist can only be applied with the cursor
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// on `if`.
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//
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// ```
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// fn main() {
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// if<|> !y { A } else { B }
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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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// if y { B } else { A }
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// }
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// ```
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pub(crate) fn invert_if(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
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let if_keyword = ctx.find_token_at_offset(T![if])?;
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let expr = ast::IfExpr::cast(if_keyword.parent())?;
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let if_range = if_keyword.text_range();
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let cursor_in_range = if_range.contains_range(ctx.frange.range);
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if !cursor_in_range {
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return None;
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}
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// This assist should not apply for if-let.
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if expr.condition()?.pat().is_some() {
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return None;
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}
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let cond = expr.condition()?.expr()?;
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let then_node = expr.then_branch()?.syntax().clone();
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let else_block = match expr.else_branch()? {
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ast::ElseBranch::Block(it) => it,
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ast::ElseBranch::IfExpr(_) => return None,
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};
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let cond_range = cond.syntax().text_range();
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let flip_cond = invert_boolean_expression(cond);
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let else_node = else_block.syntax();
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let else_range = else_node.text_range();
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let then_range = then_node.text_range();
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acc.add(AssistId("invert_if"), "Invert if", if_range, |edit| {
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edit.replace(cond_range, flip_cond.syntax().text());
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edit.replace(else_range, then_node.text());
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edit.replace(then_range, else_node.text());
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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 invert_if_remove_inequality() {
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check_assist(
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invert_if,
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"fn f() { i<|>f x != 3 { 1 } else { 3 + 2 } }",
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"fn f() { if x == 3 { 3 + 2 } else { 1 } }",
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)
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}
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#[test]
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fn invert_if_remove_not() {
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check_assist(
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invert_if,
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"fn f() { <|>if !cond { 3 * 2 } else { 1 } }",
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"fn f() { if cond { 1 } else { 3 * 2 } }",
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)
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}
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#[test]
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fn invert_if_general_case() {
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check_assist(
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invert_if,
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"fn f() { i<|>f cond { 3 * 2 } else { 1 } }",
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"fn f() { if !cond { 1 } else { 3 * 2 } }",
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)
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}
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#[test]
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fn invert_if_doesnt_apply_with_cursor_not_on_if() {
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check_assist_not_applicable(invert_if, "fn f() { if !<|>cond { 3 * 2 } else { 1 } }")
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}
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#[test]
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fn invert_if_doesnt_apply_with_if_let() {
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check_assist_not_applicable(
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invert_if,
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"fn f() { i<|>f let Some(_) = Some(1) { 1 } else { 0 } }",
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)
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}
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}
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