62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
package qf1006
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import (
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"go/ast"
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"go/token"
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"honnef.co/go/tools/analysis/code"
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"honnef.co/go/tools/analysis/edit"
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"honnef.co/go/tools/analysis/lint"
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"honnef.co/go/tools/analysis/report"
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"honnef.co/go/tools/go/ast/astutil"
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"honnef.co/go/tools/pattern"
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"golang.org/x/tools/go/analysis"
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)
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var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
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Analyzer: &analysis.Analyzer{
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Name: "QF1006",
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Run: run,
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Requires: code.RequiredAnalyzers,
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},
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Doc: &lint.RawDocumentation{
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Title: `Lift \'if\'+\'break\' into loop condition`,
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Before: `
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for {
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if done {
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break
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}
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...
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}`,
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After: `
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for !done {
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...
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}`,
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Since: "2021.1",
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Severity: lint.SeverityHint,
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},
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})
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var Analyzer = SCAnalyzer.Analyzer
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var checkForLoopIfBreak = pattern.MustParse(`(ForStmt nil nil nil if@(IfStmt nil cond (BranchStmt "BREAK" nil) nil):_)`)
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func run(pass *analysis.Pass) (any, error) {
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for node, m := range code.Matches(pass, checkForLoopIfBreak) {
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pos := node.Pos() + token.Pos(len("for"))
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r := astutil.NegateDeMorgan(m.State["cond"].(ast.Expr), false)
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// FIXME(dh): we're leaving behind an empty line when we
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// delete the old if statement. However, we can't just delete
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// an additional character, in case there closing curly brace
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// is followed by a comment, or Windows newlines.
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report.Report(pass, m.State["if"].(ast.Node), "could lift into loop condition",
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report.Fixes(edit.Fix("Lift into loop condition",
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edit.ReplaceWithString(edit.Range{pos, pos}, " "+report.Render(pass, r)),
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edit.Delete(m.State["if"].(ast.Node)))))
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}
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return nil, nil
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}
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