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
|
package dstream
import (
"fmt"
"time"
)
func (sd *segmentedData) GetPos(j int) interface{} {
var x interface{}
var stash bool
if ilen(sd.stash[j]) > 0 {
x = sd.stash[j]
stash = true
} else {
x = sd.bdata[j]
}
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
pos := sd.pos
if stash {
pos = len(x)
}
return x[0:pos]
{{- end }}
default:
msg := fmt.Sprintf("Segment: unknown type %T\n", x)
panic(msg)
}
}
// fixstash appends the matching initial segment of bdata to the
// end of the stash
func (sd *segmentedData) fixstash() bool {
pos, fd := sd.findSegmentStash()
if pos == 0 {
return true
}
for j := 0; j<sd.source.NumVar(); j++ {
x := sd.bdata[j]
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
z := sd.stash[j].([]{{ .Type }})
sd.stash[j] = append(z, x[0:pos]...)
sd.bdata[j] = x[pos:len(x)]
{{- end }}
default:
msg := fmt.Sprintf("Segment: unknown type %T\n", x)
panic(msg)
}
}
return fd
}
// setstash copies bdata into stash, replacing whatever was there.
func (sd *segmentedData) setstash() {
sd.stash = make([]interface{}, sd.source.NumVar())
for j := 0; j<sd.source.NumVar(); j++ {
x := sd.bdata[j]
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
var z []{{ .Type }}
if sd.stash[j] != nil {
z = sd.stash[j].([]{{ .Type }})
}
z = resize{{ .Utype }}(z, len(x))
copy(z, x)
sd.stash[j] = z
{{- end }}
default:
msg := fmt.Sprintf("Segment: unknown type %T\n", x)
panic(msg)
}
}
}
// leftsliceb reslices every element of bdata from position
// pos to the end of the slice.
func (sd *segmentedData) leftsliceb(pos int) {
for j := 0; j < sd.source.NumVar(); j++ {
x := sd.bdata[j]
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
sd.bdata[j] = x[pos:len(x)]
{{- end }}
default:
msg := fmt.Sprintf("Segment: unknown type %T\n", x)
panic(msg)
}
}
}
// findSegment finds the next segment boundary after start in the
// current backing slice. If there is no boundary, returns -1.
func (sd *segmentedData) findSegment(start int) int {
pos := -1
for _, j := range sd.vpos {
x := sd.bdata[j]
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
for i := start+1; i < len(x); i++ {
if pos != -1 && i >= pos {
break
}
if x[i] != x[i-1] {
pos = i
break
}
}
{{- end }}
case nil:
return -1
default:
msg := fmt.Sprintf("Segment: unknown type %T\n", x)
panic(msg)
}
}
return pos
}
// findSegmentStash finds the first segment boundary in bdata, viewing bstash
// as a continuation of stash.
func (sd *segmentedData) findSegmentStash() (int, bool) {
pos := -1
var m int
for _, j := range sd.vpos {
x := sd.bdata[j]
switch x := x.(type) {
{{- range . }}
case []{{ .Type }}:
m = len(x)
y := sd.stash[j].([]{{ .Type }})
v := y[len(y) - 1]
for i := 0; i < len(x); i++ {
if pos != -1 && i >= pos {
break
}
if x[i] != v {
pos = i
break
}
}
{{- end }}
default:
msg := fmt.Sprintf("Segment: unknown type %T", x)
panic(msg)
}
}
if pos != -1 {
return pos, true
} else {
return m, false
}
}
|
