89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
package s1002
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import (
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"fmt"
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"go/ast"
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"go/token"
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"go/types"
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"strings"
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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/facts/generated"
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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/types/typeutil"
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"golang.org/x/tools/go/analysis"
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"golang.org/x/tools/go/analysis/passes/inspect"
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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: "S1002",
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Run: run,
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Requires: []*analysis.Analyzer{inspect.Analyzer, generated.Analyzer},
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},
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Doc: &lint.RawDocumentation{
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Title: `Omit comparison with boolean constant`,
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Before: `if x == true {}`,
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After: `if x {}`,
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Since: "2017.1",
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// MergeIfAll because 'true' might not be the builtin constant under all build tags.
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// You shouldn't write code like that…
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MergeIf: lint.MergeIfAll,
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},
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})
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var Analyzer = SCAnalyzer.Analyzer
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func run(pass *analysis.Pass) (any, error) {
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fn := func(node ast.Node) {
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if code.IsInTest(pass, node) {
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return
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}
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expr := node.(*ast.BinaryExpr)
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if expr.Op != token.EQL && expr.Op != token.NEQ {
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return
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}
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x := code.IsBoolConst(pass, expr.X)
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y := code.IsBoolConst(pass, expr.Y)
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if !x && !y {
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return
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}
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var other ast.Expr
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var val bool
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if x {
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val = code.BoolConst(pass, expr.X)
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other = expr.Y
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} else {
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val = code.BoolConst(pass, expr.Y)
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other = expr.X
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}
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ok := typeutil.All(pass.TypesInfo.TypeOf(other), func(term *types.Term) bool {
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basic, ok := term.Type().Underlying().(*types.Basic)
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return ok && basic.Kind() == types.Bool
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})
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if !ok {
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return
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}
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op := ""
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if (expr.Op == token.EQL && !val) || (expr.Op == token.NEQ && val) {
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op = "!"
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}
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r := op + report.Render(pass, other)
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l1 := len(r)
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r = strings.TrimLeft(r, "!")
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if (l1-len(r))%2 == 1 {
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r = "!" + r
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}
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report.Report(pass, expr, fmt.Sprintf("should omit comparison to bool constant, can be simplified to %s", r),
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report.FilterGenerated(),
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report.Fixes(edit.Fix("Simplify bool comparison", edit.ReplaceWithString(expr, r))))
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}
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code.Preorder(pass, fn, (*ast.BinaryExpr)(nil))
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return nil, nil
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}
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