Current File : //usr/local/go119/src/cmd/go/internal/test/internal/genflags/vetflag.go
// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package genflags
import (
"bytes"
"cmd/go/internal/base"
"encoding/json"
"fmt"
"os/exec"
"regexp"
"sort"
)
// VetAnalyzers computes analyzers and their aliases supported by vet.
func VetAnalyzers() ([]string, error) {
// get supported vet flag information
tool := base.Tool("vet")
vetcmd := exec.Command(tool, "-flags")
out := new(bytes.Buffer)
vetcmd.Stdout = out
if err := vetcmd.Run(); err != nil {
return nil, fmt.Errorf("go vet: can't execute %s -flags: %v\n", tool, err)
}
var analysisFlags []struct {
Name string
Bool bool
Usage string
}
if err := json.Unmarshal(out.Bytes(), &analysisFlags); err != nil {
return nil, fmt.Errorf("go vet: can't unmarshal JSON from %s -flags: %v", tool, err)
}
// parse the flags to figure out which ones stand for analyses
analyzerSet := make(map[string]bool)
rEnable := regexp.MustCompile("^enable .+ analysis$")
for _, flag := range analysisFlags {
if rEnable.MatchString(flag.Usage) {
analyzerSet[flag.Name] = true
}
}
rDeprecated := regexp.MustCompile("^deprecated alias for -(?P<analyzer>(.+))$")
// Returns the original value matched by rDeprecated on input value.
// If there is no match, "" is returned.
originalValue := func(value string) string {
match := rDeprecated.FindStringSubmatch(value)
if len(match) < 2 {
return ""
}
return match[1]
}
// extract deprecated aliases for existing analyses
for _, flag := range analysisFlags {
if o := originalValue(flag.Usage); analyzerSet[o] {
analyzerSet[flag.Name] = true
}
}
var analyzers []string
for a := range analyzerSet {
analyzers = append(analyzers, a)
}
sort.Strings(analyzers)
return analyzers, nil
}
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