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
|
package main
import (
"strings"
)
type SubexState interface {
eat(store Store, char rune) []SubexBranch
accepting(store Store) []string
}
type SubexGroupState struct {
first, second SubexState
}
func (state SubexGroupState) eat(store Store, char rune) []SubexBranch {
otherStore := store.clone()
return append(state.first.eat(store, char), state.second.eat(otherStore, char)...)
}
func (state SubexGroupState) accepting(store Store) []string {
return append(state.first.accepting(store), state.second.accepting(store)...)
}
type SubexStoreState struct {
match SubexState
slot rune
next SubexState
toStore string
}
func (state SubexStoreState) eat(store Store, char rune) (nextStates []SubexBranch) {
acceptedOutputs := state.match.accepting(store)
for _, acceptedOutput := range acceptedOutputs {
nextStore := store.withValue(state.slot, state.toStore + acceptedOutput)
nextStates = append(nextStates, state.next.eat(nextStore.clone(), char)...)
}
nextMatchStates := state.match.eat(store.clone(), char)
for _, matchState := range nextMatchStates {
nextStates = append(nextStates, SubexBranch {
state: SubexStoreState {
match: matchState.state,
slot: state.slot,
next: state.next,
toStore: state.toStore + matchState.output,
},
output: "",
store: store.clone(),
})
}
return nextStates
}
func (state SubexStoreState) accepting(store Store) (outputs []string) {
acceptedOutputs := state.match.accepting(store)
for _, acceptedOutput := range acceptedOutputs {
nextStore := store.withValue(state.slot, state.toStore + acceptedOutput)
outputs = append(outputs, state.next.accepting(nextStore)...)
}
return outputs
}
type SubexOutputState struct {
content []TransducerOutput
next SubexState
}
func (state SubexOutputState) build(store Store) string {
var builder strings.Builder
for _, part := range state.content {
builder.WriteString(part.build(store))
}
return builder.String()
}
func (state SubexOutputState) eat(store Store, char rune) []SubexBranch {
content := state.build(store)
nextStates := state.next.eat(store, char)
for i := range nextStates {
nextStates[i].output = content + nextStates[i].output
}
return nextStates
}
func (state SubexOutputState) accepting(store Store) []string {
content := state.build(store)
outputs := state.next.accepting(store)
for i := range outputs {
outputs[i] = content + outputs[i]
}
return outputs
}
type SubexNoneState struct {}
func (state SubexNoneState) eat(store Store, char rune) []SubexBranch {
return nil
}
func (state SubexNoneState) accepting(store Store) []string {
return []string{""}
}
type SubexCopyRuneState struct {
rune rune
next SubexState
}
func (state SubexCopyRuneState) eat(store Store, char rune) []SubexBranch {
if char == state.rune {
return []SubexBranch{{
state: state.next,
output: string(char),
store: store,
}}
}
return nil
}
func (state SubexCopyRuneState) accepting(store Store) []string {
return nil
}
type SubexCopyAnyState struct {
next SubexState
}
func (state SubexCopyAnyState) eat(store Store, char rune) []SubexBranch {
return []SubexBranch{{
state: state.next,
output: string(char),
store: store,
}}
}
func (state SubexCopyAnyState) accepting(store Store) []string {
return nil
}
|
