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309 lines
7.1 KiB
Go

package main
import (
"bytes"
"flag"
"fmt"
"go/ast"
"go/format"
"go/parser"
"go/token"
"io"
"io/ioutil"
"os"
"strconv"
"strings"
"text/template"
)
var (
messageTypes = make(map[string]bool)
enumTypes = make(map[string]bool)
entityTypes = make(map[int]string)
cmdTypes = make(map[int]string)
cmdEnumType = "EDemoCommands"
entityEnumTypes = map[string]bool{
"NET_Messages": true,
"SVC_Messages": true,
"EBaseUserMessages": true,
"EBaseEntityMessages": true,
"EBaseGameEvents": true,
"EDotaUserMessages": true,
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"ETEProtobufIds": true,
}
prefixes = map[string]string{
"EDemoCommands_DEM_": "CDemo",
"NET_Messages_net_": "CNETMsg_",
"SVC_Messages_svc_": "CSVCMsg_",
"EBaseUserMessages_UM_": "CUserMessage",
"EBaseEntityMessages_EM_": "CEntityMessage",
"EBaseGameEvents_GE_": "CMsg",
"EDotaUserMessages_DOTA_UM_": "CDOTAUserMsg_",
}
specials = map[string]string{
"EDotaUserMessages_DOTA_UM_StatsHeroDetails": "CDOTAUserMsg_StatsHeroMinuteDetails",
"EDotaUserMessages_DOTA_UM_CombatLogDataHLTV": "CMsgDOTACombatLogEntry",
"EDotaUserMessages_DOTA_UM_TournamentDrop": "CMsgGCToClientTournamentItemDrop",
"EDotaUserMessages_DOTA_UM_MatchMetadata": "CDOTAClientMsg_MatchMetadata",
"ETEProtobufIds_TE_EffectDispatchId": "CMsgTEEffectDispatch",
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"EDemoCommands_DEM_SignonPacket": "CDemoPacket",
}
// EBaseUserMessages_UM_HandHapticPulse
tpl = `package main
////////////////////////////////////////////////////////////////////////////////
//
// .aMMMb .aMMMb dMMMMb dMMMMMP
// dMP"VMP dMP"dMP dMP VMP dMP
// dMP dMP dMP dMP dMP dMMMP
// dMP.aMP dMP.aMP dMP.aMP dMP
// VMMMP" VMMMP" dMMMMP" dMMMMMP
//
// .aMMMMP dMMMMMP dMMMMb dMMMMMP dMMMMb .aMMMb dMMMMMMP dMMMMMP dMMMMb
// dMP" dMP dMP dMP dMP dMP.dMP dMP"dMP dMP dMP dMP VMP
// dMP MMP"dMMMP dMP dMP dMMMP dMMMMK" dMMMMMP dMP dMMMP dMP dMP
// dMP.dMP dMP dMP dMP dMP dMP"AMF dMP dMP dMP dMP dMP.aMP
// VMMMP" dMMMMMP dMP dMP dMMMMMP dMP dMP dMP dMP dMP dMMMMMP dMMMMP"
//
//
// This code was generated by a code-generation program. It was NOT written by
// hand. Do not edit this file by hand! Your edits will be destroyed!
//
// This file can be regenerated by running "go generate"
//
// The generator program is defined in "gen/main.go"
//
////////////////////////////////////////////////////////////////////////////////
import (
"github.com/golang/protobuf/proto"
"github.com/jordanorelli/hyperstone/dota"
)
type protoFactory map[int]func() proto.Message
func (p protoFactory) BuildMessage(id int) proto.Message {
fn, ok := p[id]
if !ok {
return nil
}
return fn()
}
var cmdFactory = protoFactory{
{{- range $id, $name := .Commands }}
{{$id}}: func() proto.Message { return new(dota.{{$name}}) },
{{- end }}
}
var entFactory = protoFactory{
{{- range $id, $name := .Entities }}
{{$id}}: func() proto.Message { return new(dota.{{$name}}) },
{{- end }}
}
`
)
func ensureNewline(t string) string {
if strings.HasSuffix(t, "\n") {
return t
}
return t + "\n"
}
func bail(status int, t string, args ...interface{}) {
var out io.Writer
if status == 0 {
out = os.Stdout
} else {
out = os.Stderr
}
fmt.Fprintf(out, ensureNewline(t), args...)
os.Exit(status)
}
// processes a single value specification
func processValueSpec(spec *ast.ValueSpec) {
if spec.Type == nil {
return
}
t, ok := spec.Type.(*ast.Ident)
if !ok {
return
}
var isEntityType bool
switch {
case t.Name == cmdEnumType:
// it's a message type
case entityEnumTypes[t.Name]:
isEntityType = true
default:
return
}
for i, name := range spec.Names {
if name.Name == "_" {
continue
}
valExpr := spec.Values[i]
litExpr, ok := valExpr.(*ast.BasicLit)
if !ok {
continue
}
if litExpr.Kind != token.INT {
continue
}
n, err := strconv.Atoi(litExpr.Value)
if err != nil {
continue
}
if isEntityType {
entityTypes[n] = name.Name
} else {
cmdTypes[n] = name.Name
}
}
}
// processes a single type specification from the Go source
// e.g.:
// type Thing int32
// type Message struct {
// ...
// }
func processTypeSpec(spec *ast.TypeSpec) {
switch tt := spec.Type.(type) {
case *ast.StructType:
// the only structes that are defined in our generated proto code are
// protobuf message types
messageTypes[spec.Name.Name] = true
case *ast.Ident:
switch tt.Name {
case "int32":
// all protobuf enums generate int32s in Go
enumTypes[spec.Name.Name] = true
}
}
}
// processes one specification from the Go source
func processSpec(spec ast.Spec) {
switch t := spec.(type) {
case *ast.ValueSpec:
processValueSpec(t)
case *ast.TypeSpec:
processTypeSpec(t)
}
}
// processes one protobuf-generated Go declaration
func processDeclaration(decl ast.Decl) {
d, ok := decl.(*ast.GenDecl)
if !ok {
return
}
for _, spec := range d.Specs {
processSpec(spec)
}
}
// processes one protobuf-generated Go file
func processFile(name string, fi *ast.File) {
for _, decl := range fi.Decls {
processDeclaration(decl)
}
}
// processes a package of protobuf-generated Go
func processPackage(name string, pkg *ast.Package) {
for name, fi := range pkg.Files {
processFile(name, fi)
}
}
// given an enum name, finds the appropriate message type
func typeName(enumName string) string {
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if name, ok := specials[enumName]; ok {
return name
}
for prefix, replacement := range prefixes {
if strings.HasPrefix(enumName, prefix) {
candidate := strings.Replace(enumName, prefix, replacement, 1)
if messageTypes[candidate] {
return candidate
}
}
}
return ""
}
func main() {
flag.Parse()
if flag.NArg() != 1 {
bail(1, "gen should get exactly one argument: the directory to operate on")
}
path := flag.Arg(0)
fs := token.NewFileSet()
packages, err := parser.ParseDir(fs, path, nil, 0)
if err != nil {
bail(1, "go parser error: %v", err)
}
for name, pkg := range packages {
processPackage(name, pkg)
}
type typeMap map[int]string
type context struct {
Commands typeMap
Entities typeMap
}
ctx := context{make(typeMap), make(typeMap)}
for id, name := range cmdTypes {
realName := typeName(name)
if realName == "" {
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fmt.Printf("no typename known for command enum name %s (%d)\n", name, id)
continue
}
ctx.Commands[id] = realName
}
for id, name := range entityTypes {
realName := typeName(name)
if realName == "" {
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fmt.Printf("no typename known for entity enum name %s (%d)\n", name, id)
continue
}
ctx.Entities[id] = realName
}
t, err := template.New("out.go").Parse(tpl)
if err != nil {
bail(1, "bad template: %v", err)
}
buf := bytes.NewBuffer(nil)
if err := t.Execute(buf, ctx); err != nil {
bail(1, "template error: %v", err)
}
source, err := format.Source(buf.Bytes())
if err != nil {
bail(1, "fmt error: %v", err)
}
if err := ioutil.WriteFile("generated.go", source, 0644); err != nil {
bail(1, "error writing source output: %v", err)
}
}