<- Back to shtanton's homepage
summaryrefslogtreecommitdiff
path: root/main/subexast.go
blob: aabdcd0f9ed469e4cc811f51f1c6c130422de3a8 (plain)
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
package main

import (
	"fmt"
)

type SubexAST interface {
	compileWith(next SubexState) SubexState
}

type SubexASTConcat struct {
	first, second SubexAST
}
func (ast SubexASTConcat) compileWith(next SubexState) SubexState {
	return ast.first.compileWith(ast.second.compileWith(next))
}
func (ast SubexASTConcat) String() string {
	return fmt.Sprintf("(%v)(%v)", ast.first, ast.second)
}

type SubexASTStore struct {
	match SubexAST
	slot rune
}
func (ast SubexASTStore) compileWith(next SubexState) SubexState {
	return &SubexStoreState {
		match: ast.match.compileWith(&SubexNoneState{}),
		slot: ast.slot,
		next: next,
	}
}
func (ast SubexASTStore) String() string {
	return fmt.Sprintf("$%c(%v)", ast.slot, ast.match)
}

type SubexASTOr struct {
	first, second SubexAST
}
func (ast SubexASTOr) compileWith(next SubexState) SubexState {
	return &SubexGroupState {
		ast.first.compileWith(next),
		ast.second.compileWith(next),
	}
}

type SubexASTMaximise struct {
	content SubexAST
}
func (ast SubexASTMaximise) compileWith(next SubexState) SubexState {
	state := &SubexGroupState {
		nil,
		next,
	}
	state.first = ast.content.compileWith(state)
	return state
}
func (ast SubexASTMaximise) String() string {
	return fmt.Sprintf("(%v)*", ast.content)
}

type SubexASTMinimise struct {
	content SubexAST
}
func (ast SubexASTMinimise) compileWith(next SubexState) SubexState {
	state := &SubexGroupState {
		next,
		nil,
	}
	state.second = ast.content.compileWith(state)
	return state
}
func (ast SubexASTMinimise) String() string {
	return fmt.Sprintf("(%v)-", ast.content)
}

type SubexASTRepeat struct {
	content SubexAST
	min, max int
}
func (ast SubexASTRepeat) compileWith(next SubexState) SubexState {
	for i := ast.min; i < ast.max; i += 1 {
		next = &SubexGroupState {
			ast.content.compileWith(next),
			next,
		}
	}
	for i := 0; i < ast.min; i += 1 {
		next = ast.content.compileWith(next)
	}
	return next
}

type SubexASTCopyRune rune
func (ast SubexASTCopyRune) compileWith(next SubexState) SubexState {
	return &SubexCopyRuneState{
		rune: rune(ast),
		next: next,
	}
}

type SubexASTCopyAny struct {}
func (ast SubexASTCopyAny) compileWith(next SubexState) SubexState {
	return &SubexCopyAnyState{next}
}
func (ast SubexASTCopyAny) String() string {
	return "."
}

type SubexASTOutput struct {
	replacement []TransducerOutput
}
func (ast SubexASTOutput) compileWith(next SubexState) SubexState {
	return &SubexOutputState{
		content: ast.replacement,
		next: next,
	}
}

type SubexASTTry struct {
	content SubexAST
}
func (ast SubexASTTry) compileWith(next SubexState) SubexState {
	return &SubexGroupState {
		ast.content.compileWith(next),
		next,
	}
}

type SubexASTMaybe struct {
	content SubexAST
}
func (ast SubexASTMaybe) compileWith(next SubexState) SubexState {
	return &SubexGroupState {
		next,
		ast.content.compileWith(next),
	}
}

type SubexASTJoin struct {
	content, delimiter SubexAST
}
func (ast SubexASTJoin) compileWith(next SubexState) SubexState {
	afterContentState := &SubexGroupState {
		nil,
		next,
	}
	manyContentsState := ast.content.compileWith(afterContentState)
	afterContentState.first = ast.delimiter.compileWith(manyContentsState)
	return &SubexGroupState {
		manyContentsState,
		next,
	}
}

type SubexASTRange struct {
	parts map[rune]rune
}
func (ast SubexASTRange) compileWith(next SubexState) SubexState {
	return &SubexRangeState {
		parts: ast.parts,
		next: next,
	}
}