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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// Package ast declares the types used to represent syntax trees for HCL
// (HashiCorp Configuration Language)
package ast
import (
"fmt"
"strings"
"github.com/hashicorp/hcl/hcl/token"
)
// Node is an element in the abstract syntax tree.
type Node interface {
node()
Pos() token.Pos
}
func (File) node() {}
func (ObjectList) node() {}
func (ObjectKey) node() {}
func (ObjectItem) node() {}
func (Comment) node() {}
func (CommentGroup) node() {}
func (ObjectType) node() {}
func (LiteralType) node() {}
func (ListType) node() {}
// File represents a single HCL file
type File struct {
Node Node // usually a *ObjectList
Comments []*CommentGroup // list of all comments in the source
}
func (f *File) Pos() token.Pos {
return f.Node.Pos()
}
// ObjectList represents a list of ObjectItems. An HCL file itself is an
// ObjectList.
type ObjectList struct {
Items []*ObjectItem
}
func (o *ObjectList) Add(item *ObjectItem) {
o.Items = append(o.Items, item)
}
// Filter filters out the objects with the given key list as a prefix.
//
// The returned list of objects contain ObjectItems where the keys have
// this prefix already stripped off. This might result in objects with
// zero-length key lists if they have no children.
//
// If no matches are found, an empty ObjectList (non-nil) is returned.
func (o *ObjectList) Filter(keys ...string) *ObjectList {
var result ObjectList
for _, item := range o.Items {
// If there aren't enough keys, then ignore this
if len(item.Keys) < len(keys) {
continue
}
match := true
for i, key := range item.Keys[:len(keys)] {
key := key.Token.Value().(string)
if key != keys[i] && !strings.EqualFold(key, keys[i]) {
match = false
break
}
}
if !match {
continue
}
// Strip off the prefix from the children
newItem := *item
newItem.Keys = newItem.Keys[len(keys):]
result.Add(&newItem)
}
return &result
}
// Children returns further nested objects (key length > 0) within this
// ObjectList. This should be used with Filter to get at child items.
func (o *ObjectList) Children() *ObjectList {
var result ObjectList
for _, item := range o.Items {
if len(item.Keys) > 0 {
result.Add(item)
}
}
return &result
}
// Elem returns items in the list that are direct element assignments
// (key length == 0). This should be used with Filter to get at elements.
func (o *ObjectList) Elem() *ObjectList {
var result ObjectList
for _, item := range o.Items {
if len(item.Keys) == 0 {
result.Add(item)
}
}
return &result
}
func (o *ObjectList) Pos() token.Pos {
// always returns the uninitiliazed position
return o.Items[0].Pos()
}
// ObjectItem represents a HCL Object Item. An item is represented with a key
// (or keys). It can be an assignment or an object (both normal and nested)
type ObjectItem struct {
// keys is only one length long if it's of type assignment. If it's a
// nested object it can be larger than one. In that case "assign" is
// invalid as there is no assignments for a nested object.
Keys []*ObjectKey
// assign contains the position of "=", if any
Assign token.Pos
// val is the item itself. It can be an object,list, number, bool or a
// string. If key length is larger than one, val can be only of type
// Object.
Val Node
LeadComment *CommentGroup // associated lead comment
LineComment *CommentGroup // associated line comment
}
func (o *ObjectItem) Pos() token.Pos {
// I'm not entirely sure what causes this, but removing this causes
// a test failure. We should investigate at some point.
if len(o.Keys) == 0 {
return token.Pos{}
}
return o.Keys[0].Pos()
}
// ObjectKeys are either an identifier or of type string.
type ObjectKey struct {
Token token.Token
}
func (o *ObjectKey) Pos() token.Pos {
return o.Token.Pos
}
// LiteralType represents a literal of basic type. Valid types are:
// token.NUMBER, token.FLOAT, token.BOOL and token.STRING
type LiteralType struct {
Token token.Token
// associated line comment, only when used in a list
LineComment *CommentGroup
}
func (l *LiteralType) Pos() token.Pos {
return l.Token.Pos
}
// ListStatement represents a HCL List type
type ListType struct {
Lbrack token.Pos // position of "["
Rbrack token.Pos // position of "]"
List []Node // the elements in lexical order
}
func (l *ListType) Pos() token.Pos {
return l.Lbrack
}
func (l *ListType) Add(node Node) {
l.List = append(l.List, node)
}
// ObjectType represents a HCL Object Type
type ObjectType struct {
Lbrace token.Pos // position of "{"
Rbrace token.Pos // position of "}"
List *ObjectList // the nodes in lexical order
}
func (o *ObjectType) Pos() token.Pos {
return o.Lbrace
}
// Comment node represents a single //, # style or /*- style commment
type Comment struct {
Start token.Pos // position of / or #
Text string
}
func (c *Comment) Pos() token.Pos {
return c.Start
}
// CommentGroup node represents a sequence of comments with no other tokens and
// no empty lines between.
type CommentGroup struct {
List []*Comment // len(List) > 0
}
func (c *CommentGroup) Pos() token.Pos {
return c.List[0].Pos()
}
//-------------------------------------------------------------------
// GoStringer
//-------------------------------------------------------------------
func (o *ObjectKey) GoString() string { return fmt.Sprintf("*%#v", *o) }
func (o *ObjectList) GoString() string { return fmt.Sprintf("*%#v", *o) }
|
