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
|
package main
import (
"main/walk"
"main/subex"
)
type PrintValueCommand struct {}
func (cmd PrintValueCommand) exec(state *ProgramState) {
path := walk.PathFromWalkValues(state.path)
for _, value := range state.value {
state.out <- walk.WalkItem {
Value: value,
Path: path,
}
}
}
type ToggleTerminalCommand struct {}
func (cmd ToggleTerminalCommand) exec(state *ProgramState) {
toggled := map[walk.TerminalValue]walk.TerminalValue {
walk.ArrayBegin: walk.MapBegin,
walk.ArrayEnd: walk.MapEnd,
walk.MapBegin: walk.ArrayBegin,
walk.MapEnd: walk.ArrayEnd,
}
for i := range state.value {
terminal, isTerminal := state.value[i].(walk.TerminalValue)
if !isTerminal {
continue
}
state.value[i] = toggled[terminal]
}
}
type FilteredCommand struct {
filter Filter
command Command
}
func (cmd FilteredCommand) exec(state *ProgramState) {
path := walk.PathFromWalkValues(state.path)
for _, value := range state.value {
if cmd.filter.exec(walk.WalkItem {
Value: value,
Path: path,
}) {
cmd.command.exec(state)
return
}
}
}
type SequenceCommand struct {
commands []Command
}
func (cmd SequenceCommand) exec(state *ProgramState) {
for _, command := range cmd.commands {
command.exec(state)
}
}
type AppendLiteralCommand struct {
values []walk.WalkValue
}
func (cmd AppendLiteralCommand) exec(state *ProgramState) {
state.value = append(state.value, cmd.values...)
}
type PrependLiteralCommand struct {
values []walk.WalkValue
}
func (cmd PrependLiteralCommand) exec(state *ProgramState) {
var newItems []walk.WalkValue
newItems = append(newItems, cmd.values...)
state.value = append(newItems, state.value...)
}
type NextCommand struct {}
func (cmd NextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.value = []walk.WalkValue{nextItem.Value}
state.path = nextItem.Path.ToWalkValues()
}
type AppendNextCommand struct {}
func (cmd AppendNextCommand) exec(state *ProgramState) {
nextItem := <- state.in
state.value = append(state.value, nextItem.Value)
state.path = nextItem.Path.ToWalkValues()
}
type PrintLiteralsCommand struct {
items []walk.WalkItem
}
func (cmd PrintLiteralsCommand) exec(state *ProgramState) {
for _, item := range cmd.items {
state.out <- item
}
}
type DeleteAllCommand struct {}
func (cmd DeleteAllCommand) exec(state *ProgramState) {
state.path = nil
state.value = nil
}
type SubstituteCommand struct {
subex subex.SubexState
}
func (cmd SubstituteCommand) exec(state *ProgramState) {
valueStream := make(chan walk.WalkValue)
go func(in []walk.WalkValue, out chan<- walk.WalkValue) {
for _, value := range in {
out <- value
}
close(out)
}(state.value, valueStream)
atomStream := walk.Atomise(valueStream)
atomsOut, error := subex.RunTransducer(cmd.subex, atomStream)
if error {
panic("Error running subex")
}
valuesOut, err := walk.MemoryCompound(atomsOut)
if err != nil {
panic("Error compounding atoms")
}
state.value = valuesOut
}
type Command interface {
exec(*ProgramState)
}
|
