-
Notifications
You must be signed in to change notification settings - Fork 0
/
metatable.go
154 lines (129 loc) · 3.42 KB
/
metatable.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
// Copyright 2020 Torben Schinke
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package meta
import (
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"hash"
"sort"
"strconv"
)
// DeclId is usually a unique hash for a declaration (not just named types).
type DeclId string
type DeclIdBuilder struct {
hasher hash.Hash
}
func NewDeclId() *DeclIdBuilder {
return &DeclIdBuilder{hasher: sha256.New()}
}
func (b *DeclIdBuilder) Put(values ...interface{}) *DeclIdBuilder {
for _, v := range values {
switch t := v.(type) {
case string:
b.hasher.Write([]byte(t))
case int:
b.hasher.Write([]byte(strconv.Itoa(t)))
default:
b.hasher.Write([]byte(fmt.Sprintf("%v", v)))
}
}
return b
}
func (b *DeclIdBuilder) Finish() DeclId {
r := b.hasher.Sum(nil)
b.hasher.Reset()
return DeclId(hex.EncodeToString(r[:16])) // 16 byte/128bit is probably still more than enough
}
type PkgId string
type Package struct {
Path string
Name string
Declarations []DeclId
}
// Table contains all resolved type declarations and other deduplicated information. Due to the sake of the default
// value in json for integer types (==0), we use 0 to indicate "undefined".
type Table struct {
Packages map[PkgId]*Package
Declarations map[DeclId]Type
}
func NewTable() *Table {
t := &Table{
Packages: map[PkgId]*Package{},
Declarations: map[DeclId]Type{},
}
return t
}
// DeclIds returns a stable and sorted slice of declarations ids
func (t *Table) DeclIds() []DeclId {
tmp := make([]DeclId, 0, len(t.Declarations))
for k := range t.Declarations {
tmp = append(tmp, k)
}
sort.Slice(tmp, func(i, j int) bool {
return tmp[i] < tmp[j]
})
return tmp
}
func (t *Table) HasDeclaration(q DeclId) bool {
_, ok := t.Declarations[q]
return ok
}
func (t *Table) PutDeclaration(q DeclId, p Type) {
t.Declarations[q] = p
}
func (t *Table) PutNamedDeclaration(importPath, pkgName string, q DeclId, p *Named) {
pid, ok := t.PackageByImportPath(importPath)
if !ok {
pid = PkgId(NewDeclId().Put(importPath).Finish())
t.Packages[pid] = &Package{
Path: importPath,
Name: pkgName,
}
}
pkg := t.Packages[pid]
if pkg.Name != pkgName {
panic("inconsistent package name:" + pkgName + " vs " + pkg.Name)
}
t.PutDeclaration(q, Type{
Named: p,
})
pkg.Declarations = append(pkg.Declarations, q)
}
// CreateImportTable creates a new table which assigns each declaration id to its containing package id.
func (t *Table) CreateImportTable() map[DeclId]PkgId {
r := map[DeclId]PkgId{}
for pid, pkg := range t.Packages {
for _, did := range pkg.Declarations {
r[did] = pid
}
}
return r
}
func (t *Table) PackageByImportPath(importPath string) (PkgId, bool) {
for k, v := range t.Packages {
if v.Path == importPath {
return k, true
}
}
return "", false
}
func (t *Table) String() string {
b, err := json.MarshalIndent(t, " ", " ")
if err != nil {
panic(err) //cannot happen
}
return string(b)
}