FilesExpand file tree

 master

/

runtime.go

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

165 lines (150 loc) · 3.92 KB

 master

/

runtime.go

Copy path

Top

File metadata and controls

• Code
• Blame

165 lines (150 loc) · 3.92 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

package expr

import (

"fmt"

"reflect"

)

func toNumber(n Node, val interface{}) float64 {

v, ok := cast(val)

if ok {

return v

}

panic(fmt.Sprintf("cannot convert %v (type %T) to type float64", n, val))

}

func cast(val interface{}) (float64, bool) {

v := reflect.ValueOf(val)

switch v.Kind() {

case reflect.Float32, reflect.Float64:

return v.Float(), true

case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:

return float64(v.Int()), true

case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:

return float64(v.Uint()), true // TODO: Check if uint64 fits into float64.

}

return 0, false

}

func isNumber(val interface{}) bool {

return val != nil && reflect.TypeOf(val).Kind() == reflect.Float64

}

func canBeNumber(val interface{}) bool {

if val != nil {

return isNumberType(reflect.TypeOf(val))

}

return false

}

func equal(left, right interface{}) bool {

if isNumber(left) && canBeNumber(right) {

right, _ := cast(right)

return left == right

} else if canBeNumber(left) && isNumber(right) {

left, _ := cast(left)

return left == right

} else {

return reflect.DeepEqual(left, right)

}

}

func extract(val interface{}, i interface{}) (interface{}, bool) {

v := reflect.ValueOf(val)

switch v.Kind() {

case reflect.Array, reflect.Slice, reflect.String:

n, ok := cast(i)

if !ok {

break

}

value := v.Index(int(n))

if value.IsValid() && value.CanInterface() {

return value.Interface(), true

}

case reflect.Map:

value := v.MapIndex(reflect.ValueOf(i))

if value.IsValid() && value.CanInterface() {

return value.Interface(), true

}

case reflect.Struct:

value := v.FieldByName(reflect.ValueOf(i).String())

if value.IsValid() && value.CanInterface() {

return value.Interface(), true

}

case reflect.Ptr:

value := v.Elem()

if value.IsValid() && value.CanInterface() {

return extract(value.Interface(), i)

}

}

return nil, false

}

func getFunc(val interface{}, i interface{}) (interface{}, bool) {

v := reflect.ValueOf(val)

d := v

if v.Kind() == reflect.Ptr {

d = v.Elem()

}

switch d.Kind() {

case reflect.Map:

value := d.MapIndex(reflect.ValueOf(i))

if value.IsValid() && value.CanInterface() {

return value.Interface(), true

}

case reflect.Struct:

name := reflect.ValueOf(i).String()

method := v.MethodByName(name)

if method.IsValid() && method.CanInterface() {

return method.Interface(), true

}

// If struct has not method, maybe it has func field.

// To access this field we need dereferenced value.

value := d.FieldByName(name)

if value.IsValid() && value.CanInterface() {

return value.Interface(), true

}

}

return nil, false

}

func contains(needle interface{}, array interface{}) (bool, error) {

if array != nil {

v := reflect.ValueOf(array)

switch v.Kind() {

case reflect.Array, reflect.Slice:

for i := 0; i < v.Len(); i++ {

value := v.Index(i)

if value.IsValid() && value.CanInterface() {

if equal(value.Interface(), needle) {

return true, nil

}

}

}

return false, nil

case reflect.Map:

n := reflect.ValueOf(needle)

if !n.IsValid() {

return false, fmt.Errorf("cannot use %T as index to %T", needle, array)

}

value := v.MapIndex(n)

if value.IsValid() {

return true, nil

}

return false, nil

case reflect.Struct:

n := reflect.ValueOf(needle)

if !n.IsValid() || n.Kind() != reflect.String {

return false, fmt.Errorf("cannot use %T as field name of %T", needle, array)

}

value := v.FieldByName(n.String())

if value.IsValid() {

return true, nil

}

return false, nil

case reflect.Ptr:

value := v.Elem()

if value.IsValid() && value.CanInterface() {

return contains(needle, value.Interface())

}

return false, nil

}

return false, fmt.Errorf("operator \"in\" not defined on %T", array)

}

return false, nil

}

func isNil(val interface{}) bool {

v := reflect.ValueOf(val)

return !v.IsValid() || v.IsNil()

}