.config/coc/extensions/coc-go-data/tools/pkg/mod/honnef.co/go/tools@v0.0.1-2020.1.5/cmd/structlayout-pretty/main.go

   1 // structlayout-pretty formats the output of structlayout with ASCII
   2 // art.
   3 package main
   4
   5 import (
   6         "encoding/json"
   7         "flag"
   8         "fmt"
   9         "log"
  10         "os"
  11         "strings"
  12
  13         st "honnef.co/go/tools/structlayout"
  14         "honnef.co/go/tools/version"
  15 )
  16
  17 var (
  18         fVerbose bool
  19         fVersion bool
  20 )
  21
  22 func init() {
  23         flag.BoolVar(&fVerbose, "v", false, "Do not compact consecutive bytes of fields")
  24         flag.BoolVar(&fVersion, "version", false, "Print version and exit")
  25 }
  26
  27 func main() {
  28         log.SetFlags(0)
  29         flag.Parse()
  30
  31         if fVersion {
  32                 version.Print()
  33                 os.Exit(0)
  34         }
  35
  36         var fields []st.Field
  37         if err := json.NewDecoder(os.Stdin).Decode(&fields); err != nil {
  38                 log.Fatal(err)
  39         }
  40         if len(fields) == 0 {
  41                 return
  42         }
  43         max := fields[len(fields)-1].End
  44         maxLength := len(fmt.Sprintf("%d", max))
  45         padding := strings.Repeat(" ", maxLength+2)
  46         format := fmt.Sprintf(" %%%dd ", maxLength)
  47         pos := int64(0)
  48         fmt.Println(padding + "+--------+")
  49         for _, field := range fields {
  50                 name := field.Name + " " + field.Type
  51                 if field.IsPadding {
  52                         name = "padding"
  53                 }
  54                 fmt.Printf(format+"|        | <- %s (size %d, align %d)\n", pos, name, field.Size, field.Align)
  55                 fmt.Println(padding + "+--------+")
  56
  57                 if fVerbose {
  58                         for i := int64(0); i < field.Size-1; i++ {
  59                                 fmt.Printf(format+"|        |\n", pos+i+1)
  60                                 fmt.Println(padding + "+--------+")
  61                         }
  62                 } else {
  63                         if field.Size > 2 {
  64                                 fmt.Println(padding + "-........-")
  65                                 fmt.Println(padding + "+--------+")
  66                                 fmt.Printf(format+"|        |\n", pos+field.Size-1)
  67                                 fmt.Println(padding + "+--------+")
  68                         }
  69                 }
  70                 pos += field.Size
  71         }
  72 }