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feat(linter): add fixer for eslint/for-direction #4679

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merged 5 commits into from
Aug 7, 2024
Merged

feat(linter): add fixer for eslint/for-direction #4679

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1eb752a
feat(linter): add fixer for eslint/for-direction
heygsc Aug 6, 2024
0a7ce67
fix typo
heygsc Aug 6, 2024
e35a125
add variables of different lengths
heygsc Aug 6, 2024
0c1a97a
refactor: logical order
heygsc Aug 7, 2024
6ff1d90
Merge branch 'main' into fixer-for-direction
heygsc Aug 7, 2024
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49 changes: 45 additions & 4 deletions crates/oxc_linter/src/rules/eslint/for_direction.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ use oxc_ast::{
};
use oxc_diagnostics::OxcDiagnostic;
use oxc_macros::declare_oxc_lint;
use oxc_span::Span;
use oxc_span::{GetSpan, Span};
use oxc_syntax::operator::{AssignmentOperator, BinaryOperator, UnaryOperator, UpdateOperator};

use crate::{context::LintContext, rule::Rule, AstNode};
Expand Down Expand Up @@ -38,7 +38,8 @@ declare_oxc_lint!(
/// for (var = 10; i >= 0; i++) {}
/// ```
ForDirection,
correctness
correctness,
dangerous_fix
);

impl Rule for ForDirection {
Expand Down Expand Up @@ -66,7 +67,35 @@ impl Rule for ForDirection {
let update_direction = get_update_direction(update, counter);
if update_direction == wrong_direction {
let update_span = get_update_span(update);
ctx.diagnostic(for_direction_diagnostic(test.span, update_span));
ctx.diagnostic_with_dangerous_fix(
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for_direction_diagnostic(test.span, update_span),
|fixer| {
let mut start: u32 = 0;
if let Expression::UpdateExpression(update) = update {
start = update.argument.span().end;
} else if let Expression::AssignmentExpression(update) = update {
start = update.left.span().end;
}
let end = start + 2;
let span = Span::new(start, end);
let mut new_operator_str = "";
if let Expression::UpdateExpression(update) = update {
if let UpdateOperator::Increment = update.operator {
new_operator_str = "--";
} else if let UpdateOperator::Decrement = update.operator {
new_operator_str = "++";
}
} else if let Expression::AssignmentExpression(update) = update {
if let AssignmentOperator::Addition = update.operator {
new_operator_str = "-=";
} else if let AssignmentOperator::Subtraction = update.operator
{
new_operator_str = "+=";
}
}
fixer.replace(span, new_operator_str)
},
);
}
}
}
Expand Down Expand Up @@ -224,5 +253,17 @@ fn test() {
("for(var i = 0; 10 > i; i-=1){}", None),
];

Tester::new(ForDirection::NAME, pass, fail).test_and_snapshot();
let fix = vec![
("for(var i = 0; i < 10; i--){}", "for(var i = 0; i < 10; i++){}", None),
("for(var i = 10; i > 0; i++){}", "for(var i = 10; i > 0; i--){}", None),
("for(var i = 0; i < 10; i-=1){}", "for(var i = 0; i < 10; i+=1){}", None),
("for(var i = 10; i > 0; i+=1){}", "for(var i = 10; i > 0; i-=1){}", None),
("for(var i = 0; i < 10; i+=-1){}", "for(var i = 0; i < 10; i-=-1){}", None),
("for(var i = 10; i > 0; i-=-1){}", "for(var i = 10; i > 0; i+=-1){}", None),
// variables of different lengths
("for(var ii = 0; ii < 10; ii--){}", "for(var ii = 0; ii < 10; ii++){}", None),
("for(var ii = 10; ii > 0; ii+=1){}", "for(var ii = 10; ii > 0; ii-=1){}", None),
];

Tester::new(ForDirection::NAME, pass, fail).expect_fix(fix).test_and_snapshot();
}