148 lines
3.8 KiB
Go
148 lines
3.8 KiB
Go
// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"bytes"
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"errors"
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"flag"
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"fmt"
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"go/types"
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"os"
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"golang.org/x/tools/go/packages"
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)
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const pathOfPackageRLP = "github.com/ethereum/go-ethereum/rlp"
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func main() {
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var (
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pkgdir = flag.String("dir", ".", "input package")
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output = flag.String("out", "-", "output file (default is stdout)")
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genEncoder = flag.Bool("encoder", true, "generate EncodeRLP?")
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genDecoder = flag.Bool("decoder", false, "generate DecodeRLP?")
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typename = flag.String("type", "", "type to generate methods for")
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)
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flag.Parse()
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cfg := Config{
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Dir: *pkgdir,
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Type: *typename,
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GenerateEncoder: *genEncoder,
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GenerateDecoder: *genDecoder,
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}
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code, err := cfg.process()
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if err != nil {
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fatal(err)
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}
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if *output == "-" {
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os.Stdout.Write(code)
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} else if err := os.WriteFile(*output, code, 0644); err != nil {
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fatal(err)
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}
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}
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func fatal(args ...interface{}) {
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fmt.Fprintln(os.Stderr, args...)
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os.Exit(1)
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}
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type Config struct {
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Dir string // input package directory
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Type string
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GenerateEncoder bool
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GenerateDecoder bool
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}
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// process generates the Go code.
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func (cfg *Config) process() (code []byte, err error) {
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// Load packages.
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pcfg := &packages.Config{
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Mode: packages.NeedName | packages.NeedTypes | packages.NeedImports | packages.NeedDeps,
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Dir: cfg.Dir,
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BuildFlags: []string{"-tags", "norlpgen"},
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}
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ps, err := packages.Load(pcfg, pathOfPackageRLP, ".")
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if err != nil {
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return nil, err
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}
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if len(ps) == 0 {
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return nil, fmt.Errorf("no Go package found in %s", cfg.Dir)
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}
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packages.PrintErrors(ps)
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// Find the packages that were loaded.
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var (
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pkg *types.Package
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packageRLP *types.Package
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)
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for _, p := range ps {
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if len(p.Errors) > 0 {
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return nil, fmt.Errorf("package %s has errors", p.PkgPath)
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}
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if p.PkgPath == pathOfPackageRLP {
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packageRLP = p.Types
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} else {
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pkg = p.Types
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}
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}
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bctx := newBuildContext(packageRLP)
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// Find the type and generate.
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typ, err := lookupStructType(pkg.Scope(), cfg.Type)
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if err != nil {
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return nil, fmt.Errorf("can't find %s in %s: %v", typ, pkg, err)
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}
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code, err = bctx.generate(typ, cfg.GenerateEncoder, cfg.GenerateDecoder)
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if err != nil {
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return nil, err
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}
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// Add build comments.
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// This is done here to avoid processing these lines with gofmt.
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var header bytes.Buffer
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fmt.Fprint(&header, "// Code generated by rlpgen. DO NOT EDIT.\n\n")
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fmt.Fprint(&header, "//go:build !norlpgen\n")
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fmt.Fprint(&header, "// +build !norlpgen\n\n")
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return append(header.Bytes(), code...), nil
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}
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func lookupStructType(scope *types.Scope, name string) (*types.Named, error) {
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typ, err := lookupType(scope, name)
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if err != nil {
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return nil, err
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}
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_, ok := typ.Underlying().(*types.Struct)
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if !ok {
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return nil, errors.New("not a struct type")
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}
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return typ, nil
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}
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func lookupType(scope *types.Scope, name string) (*types.Named, error) {
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obj := scope.Lookup(name)
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if obj == nil {
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return nil, errors.New("no such identifier")
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}
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typ, ok := obj.(*types.TypeName)
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if !ok {
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return nil, errors.New("not a type")
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}
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return typ.Type().(*types.Named), nil
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}
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