src

Go monorepo.
git clone git://code.dwrz.net/src
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sa4013.go (1231B)

      1 package sa4013
      2 
      3 import (
      4 	"go/ast"
      5 
      6 	"honnef.co/go/tools/analysis/code"
      7 	"honnef.co/go/tools/analysis/edit"
      8 	"honnef.co/go/tools/analysis/lint"
      9 	"honnef.co/go/tools/analysis/report"
     10 	"honnef.co/go/tools/pattern"
     11 
     12 	"golang.org/x/tools/go/analysis"
     13 )
     14 
     15 var SCAnalyzer = lint.InitializeAnalyzer(&lint.Analyzer{
     16 	Analyzer: &analysis.Analyzer{
     17 		Name:     "SA4013",
     18 		Run:      run,
     19 		Requires: code.RequiredAnalyzers,
     20 	},
     21 	Doc: &lint.RawDocumentation{
     22 		Title:    `Negating a boolean twice (\'!!b\') is the same as writing \'b\'. This is either redundant, or a typo.`,
     23 		Since:    "2017.1",
     24 		Severity: lint.SeverityWarning,
     25 		MergeIf:  lint.MergeIfAny,
     26 	},
     27 })
     28 
     29 var Analyzer = SCAnalyzer.Analyzer
     30 
     31 var checkDoubleNegationQ = pattern.MustParse(`(UnaryExpr "!" single@(UnaryExpr "!" x))`)
     32 
     33 func run(pass *analysis.Pass) (any, error) {
     34 	for node, m := range code.Matches(pass, checkDoubleNegationQ) {
     35 		report.Report(pass, node, "negating a boolean twice has no effect; is this a typo?", report.Fixes(
     36 			edit.Fix("Turn into single negation", edit.ReplaceWithNode(pass.Fset, node, m.State["single"].(ast.Node))),
     37 			edit.Fix("Remove double negation", edit.ReplaceWithNode(pass.Fset, node, m.State["x"].(ast.Node)))))
     38 	}
     39 	return nil, nil
     40 }