-
Notifications
You must be signed in to change notification settings - Fork 288
/
extract.go
202 lines (175 loc) · 4.46 KB
/
extract.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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
// Copyright 2020 CUE Authors
//
// 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
//
// http://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 export
import (
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/token"
"cuelang.org/go/internal"
"cuelang.org/go/internal/core/adt"
)
// ExtractDoc collects documentation strings for a field.
//
// Comments are attached to a field with a field shorthand belong to the
// child node. So in the following the comment is attached to field bar.
//
// // comment
// foo: bar: 2
//
func ExtractDoc(v *adt.Vertex) (docs []*ast.CommentGroup) {
return extractDocs(v, v.Conjuncts)
}
func extractDocs(v *adt.Vertex, a []adt.Conjunct) (docs []*ast.CommentGroup) {
fields := []*ast.Field{}
// Collect docs directly related to this Vertex.
for _, x := range a {
if v, ok := x.Expr().(*adt.Vertex); ok {
docs = append(docs, extractDocs(v, v.Conjuncts)...)
continue
}
switch f := x.Source().(type) {
case *ast.Field:
if hasShorthandValue(f) {
continue
}
fields = append(fields, f)
for _, cg := range f.Comments() {
if !containsDoc(docs, cg) && cg.Doc {
docs = append(docs, cg)
}
}
case *ast.File:
if c := internal.FileComment(f); c != nil {
docs = append(docs, c)
}
}
}
if v == nil {
return docs
}
// Collect docs from parent scopes in collapsed fields.
for p := v.Parent; p != nil; p = p.Parent {
newFields := []*ast.Field{}
for _, x := range p.Conjuncts {
f, ok := x.Source().(*ast.Field)
if !ok || !hasShorthandValue(f) {
continue
}
nested := nestedField(f)
for _, child := range fields {
if nested == child {
newFields = append(newFields, f)
for _, cg := range f.Comments() {
if !containsDoc(docs, cg) && cg.Doc {
docs = append(docs, cg)
}
}
}
}
}
fields = newFields
}
return docs
}
// hasShorthandValue reports whether this field has a struct value that will
// be rendered as a shorthand, for instance:
//
// f: g: 2
//
func hasShorthandValue(f *ast.Field) bool {
if f = nestedField(f); f == nil {
return false
}
// Not a regular field, but shorthand field.
// TODO: Should we return here? For now mimic old implementation.
if _, _, err := ast.LabelName(f.Label); err != nil {
return false
}
return true
}
// nestedField returns the child field of a field shorthand.
func nestedField(f *ast.Field) *ast.Field {
s, _ := f.Value.(*ast.StructLit)
if s == nil ||
len(s.Elts) != 1 ||
s.Lbrace != token.NoPos ||
s.Rbrace != token.NoPos {
return nil
}
f, _ = s.Elts[0].(*ast.Field)
return f
}
func containsDoc(a []*ast.CommentGroup, cg *ast.CommentGroup) bool {
for _, c := range a {
if c == cg {
return true
}
}
for _, c := range a {
if c.Text() == cg.Text() {
return true
}
}
return false
}
func ExtractFieldAttrs(v *adt.Vertex) (attrs []*ast.Attribute) {
for _, x := range v.Conjuncts {
attrs = extractFieldAttrs(attrs, x)
}
return attrs
}
func extractFieldAttrs(attrs []*ast.Attribute, c adt.Conjunct) []*ast.Attribute {
if f, ok := c.Source().(*ast.Field); ok {
for _, a := range f.Attrs {
if !containsAttr(attrs, a) {
attrs = append(attrs, a)
}
}
}
return attrs
}
func ExtractDeclAttrs(v *adt.Vertex) (attrs []*ast.Attribute) {
for _, st := range v.Structs {
if src := st.StructLit; src != nil {
attrs = extractDeclAttrs(attrs, src.Src)
}
}
return attrs
}
func extractDeclAttrs(attrs []*ast.Attribute, n ast.Node) []*ast.Attribute {
switch x := n.(type) {
case nil:
case *ast.File:
info := internal.GetPackageInfo(x)
attrs = appendDeclAttrs(attrs, x.Decls[info.Index:])
case *ast.StructLit:
attrs = appendDeclAttrs(attrs, x.Elts)
}
return attrs
}
func appendDeclAttrs(a []*ast.Attribute, decls []ast.Decl) []*ast.Attribute {
for _, d := range decls {
if attr, ok := d.(*ast.Attribute); ok && !containsAttr(a, attr) {
a = append(a, attr)
}
}
return a
}
func containsAttr(a []*ast.Attribute, x *ast.Attribute) bool {
for _, e := range a {
if e.Text == x.Text {
return true
}
}
return false
}