forked from golangci/golangci-lint
/
unparam.go
90 lines (74 loc) · 2.17 KB
/
unparam.go
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package golinters
import (
"sync"
"golang.org/x/tools/go/analysis"
"golang.org/x/tools/go/analysis/passes/buildssa"
"golang.org/x/tools/go/packages"
"mvdan.cc/unparam/check"
"github.com/golangci/golangci-lint/pkg/config"
"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
"github.com/golangci/golangci-lint/pkg/lint/linter"
"github.com/golangci/golangci-lint/pkg/result"
)
const unparamName = "unparam"
func NewUnparam(settings *config.UnparamSettings) *goanalysis.Linter {
var mu sync.Mutex
var resIssues []goanalysis.Issue
analyzer := &analysis.Analyzer{
Name: unparamName,
Doc: goanalysis.TheOnlyanalyzerDoc,
Requires: []*analysis.Analyzer{buildssa.Analyzer},
Run: func(pass *analysis.Pass) (any, error) {
issues, err := runUnparam(pass, settings)
if err != nil {
return nil, err
}
if len(issues) == 0 {
return nil, nil
}
mu.Lock()
resIssues = append(resIssues, issues...)
mu.Unlock()
return nil, nil
},
}
return goanalysis.NewLinter(
unparamName,
"Reports unused function parameters",
[]*analysis.Analyzer{analyzer},
nil,
).WithContextSetter(func(lintCtx *linter.Context) {
if settings.Algo != "cha" {
lintCtx.Log.Warnf("`linters-settings.unparam.algo` isn't supported by the newest `unparam`")
}
}).WithIssuesReporter(func(*linter.Context) []goanalysis.Issue {
return resIssues
}).WithLoadMode(goanalysis.LoadModeTypesInfo)
}
func runUnparam(pass *analysis.Pass, settings *config.UnparamSettings) ([]goanalysis.Issue, error) {
ssa := pass.ResultOf[buildssa.Analyzer].(*buildssa.SSA)
ssaPkg := ssa.Pkg
pkg := &packages.Package{
Fset: pass.Fset,
Syntax: pass.Files,
Types: pass.Pkg,
TypesInfo: pass.TypesInfo,
}
c := &check.Checker{}
c.CheckExportedFuncs(settings.CheckExported)
c.Packages([]*packages.Package{pkg})
c.ProgramSSA(ssaPkg.Prog)
unparamIssues, err := c.Check()
if err != nil {
return nil, err
}
var issues []goanalysis.Issue
for _, i := range unparamIssues {
issues = append(issues, goanalysis.NewIssue(&result.Issue{
Pos: pass.Fset.Position(i.Pos()),
Text: i.Message(),
FromLinter: unparamName,
}, pass))
}
return issues, nil
}