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Copy pathgenerated.go
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86 lines (79 loc) · 1.64 KB
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package facts
import (
"bufio"
"bytes"
"io"
"os"
"reflect"
"strings"
"golang.org/x/tools/go/analysis"
)
type Generator int
// A list of known generators we can detect
const (
Unknown Generator = iota
Goyacc
Cgo
Stringer
)
var (
// used by cgo before Go 1.11
oldCgo = []byte("// Created by cgo - DO NOT EDIT")
prefix = []byte("// Code generated ")
suffix = []byte(" DO NOT EDIT.")
nl = []byte("\n")
crnl = []byte("\r\n")
)
func isGenerated(path string) (Generator, bool) {
f, err := os.Open(path)
if err != nil {
return 0, false
}
defer f.Close()
br := bufio.NewReader(f)
for {
s, err := br.ReadBytes('\n')
if err != nil && err != io.EOF {
return 0, false
}
s = bytes.TrimSuffix(s, crnl)
s = bytes.TrimSuffix(s, nl)
if bytes.HasPrefix(s, prefix) && bytes.HasSuffix(s, suffix) {
text := string(s[len(prefix) : len(s)-len(suffix)])
switch text {
case "by goyacc.":
return Goyacc, true
case "by cmd/cgo;":
return Cgo, true
}
if strings.HasPrefix(text, `by "stringer `) {
return Stringer, true
}
return Unknown, true
}
if bytes.Equal(s, oldCgo) {
return Cgo, true
}
if err == io.EOF {
break
}
}
return 0, false
}
var Generated = &analysis.Analyzer{
Name: "isgenerated",
Doc: "annotate file names that have been code generated",
Run: func(pass *analysis.Pass) (interface{}, error) {
m := map[string]Generator{}
for _, f := range pass.Files {
path := pass.Fset.PositionFor(f.Pos(), false).Filename
g, ok := isGenerated(path)
if ok {
m[path] = g
}
}
return m, nil
},
RunDespiteErrors: true,
ResultType: reflect.TypeOf(map[string]Generator{}),
}