-
Notifications
You must be signed in to change notification settings - Fork 85
/
env.go
161 lines (127 loc) · 2.97 KB
/
env.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
package environment
import (
"github.com/genjidb/genji/document"
"github.com/genjidb/genji/internal/database"
"github.com/genjidb/genji/internal/stringutil"
"github.com/genjidb/genji/types"
)
var (
TableKey = document.Path{document.PathFragment{FieldName: "$table"}}
DocPKKey = document.Path{document.PathFragment{FieldName: "$pk"}}
)
// A Param represents a parameter passed by the user to the statement.
type Param struct {
// Name of the param
Name string
// Value is the parameter value.
Value interface{}
}
// Environment contains information about the context in which
// the expression is evaluated.
type Environment struct {
Params []Param
Vars *document.FieldBuffer
Doc types.Document
DB *database.Database
Catalog *database.Catalog
Tx *database.Transaction
Outer *Environment
}
func New(d types.Document, params ...Param) *Environment {
env := Environment{
Params: params,
Doc: d,
}
return &env
}
func (e *Environment) GetOuter() *Environment {
return e.Outer
}
func (e *Environment) SetOuter(env *Environment) {
e.Outer = env
}
func (e *Environment) Get(path document.Path) (v types.Value, ok bool) {
if e.Vars != nil {
v, err := path.GetValueFromDocument(e.Vars)
if err == nil {
return v, true
}
}
if e.Outer != nil {
return e.Outer.Get(path)
}
return types.NewNullValue(), false
}
func (e *Environment) Set(path document.Path, v types.Value) {
if e.Vars == nil {
e.Vars = document.NewFieldBuffer()
}
e.Vars.Set(path, v)
}
func (e *Environment) GetDocument() (types.Document, bool) {
if e.Doc != nil {
return e.Doc, true
}
if e.Outer != nil {
return e.Outer.GetDocument()
}
return nil, false
}
func (e *Environment) SetDocument(d types.Document) {
e.Doc = d
}
func (e *Environment) SetParams(params []Param) {
e.Params = params
}
func (e *Environment) GetParamByName(name string) (v types.Value, err error) {
if len(e.Params) == 0 {
if e.Outer != nil {
return e.Outer.GetParamByName(name)
}
}
for _, nv := range e.Params {
if nv.Name == name {
return document.NewValue(nv.Value)
}
}
return nil, stringutil.Errorf("param %s not found", name)
}
func (e *Environment) GetParamByIndex(pos int) (types.Value, error) {
if len(e.Params) == 0 {
if e.Outer != nil {
return e.Outer.GetParamByIndex(pos)
}
}
idx := int(pos - 1)
if idx >= len(e.Params) {
return nil, stringutil.Errorf("cannot find param number %d", pos)
}
return document.NewValue(e.Params[idx].Value)
}
func (e *Environment) GetTx() *database.Transaction {
if e.Tx != nil {
return e.Tx
}
if outer := e.GetOuter(); outer != nil {
return outer.GetTx()
}
return nil
}
func (e *Environment) GetDB() *database.Database {
if e.DB != nil {
return e.DB
}
if outer := e.GetOuter(); outer != nil {
return outer.GetDB()
}
return nil
}
func (e *Environment) GetCatalog() *database.Catalog {
if e.Catalog != nil {
return e.Catalog
}
if outer := e.GetOuter(); outer != nil {
return outer.GetCatalog()
}
return nil
}