74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
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/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package abi
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import (
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"crypto/sha256"
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"encoding/base64"
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"fmt"
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"go/types"
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"hash"
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)
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// Builder is a helper for constructing ABI types.
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type Builder struct {
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h hash.Hash
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buf []byte
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}
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// New creates a new ABI type Builder.
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func New() *Builder {
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h := sha256.New()
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buf := make([]byte, sha256.Size)
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return &Builder{h, buf}
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}
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// TypeName returns the ABI type name for the specified type.
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func (b *Builder) TypeName(t types.Type) string {
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switch t := t.(type) {
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case *types.Basic:
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return t.Name()
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case *types.Pointer:
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return "*" + b.TypeName(t.Elem())
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case *types.Struct:
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return b.StructName(t)
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}
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panic("todo")
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}
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// StructName returns the ABI type name for the specified struct type.
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func (b *Builder) StructName(t *types.Struct) string {
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hash := b.structHash(t)
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return "struct$" + base64.RawURLEncoding.EncodeToString(hash)
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}
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func (b *Builder) structHash(t *types.Struct) []byte {
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h := b.h
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h.Reset()
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n := t.NumFields()
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fmt.Fprintln(h, "struct", n)
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for i := 0; i < n; i++ {
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f := t.Field(i)
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name := f.Name()
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if f.Embedded() {
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name = "-"
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}
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fmt.Fprintln(h, name, b.TypeName(f.Type()))
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}
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return h.Sum(b.buf[:0])
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}
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