Ast自动生成代码

1go install golang.org/x/tools/cmd/stringer@v0.6.0 
2cd /Users/maozhongyu/code/go-tool/generate/code
3go generate .

 1//go:generate stringer -type ErrCode -linecomment
 2package code
 3
 4type ErrCode int64 //错误码
 5
 6// 错误码
 7const (
 8	ERR_CODE_OK             ErrCode = 0 //ok
 9	ERR_CODE_INVALID_PARAMS ErrCode = 1 //参数错误
10	ERR_CODE_TIMEOUT        ErrCode = 2 //超时
11)

 1
 2// Code generated by "stringer -type ErrCode -linecomment"; DO NOT EDIT.
 3
 4package code
 5
 6import "strconv"
 7
 8func _() {
 9	// An "invalid array index" compiler error signifies that the constant values have changed.
10	// Re-run the stringer command to generate them again.
11	var x [1]struct{}
12	_ = x[ERR_CODE_OK-0]
13	_ = x[ERR_CODE_INVALID_PARAMS-1]
14	_ = x[ERR_CODE_TIMEOUT-2]
15}
16
17const _ErrCode_name = "ok参数错误超时"
18
19var _ErrCode_index = [...]uint8{0, 2, 14, 20}
20
21func (i ErrCode) String() string {
22	if i < 0 || i >= ErrCode(len(_ErrCode_index)-1) {
23		return "ErrCode(" + strconv.FormatInt(int64(i), 10) + ")"
24	}
25	return _ErrCode_name[_ErrCode_index[i]:_ErrCode_index[i+1]]
26}