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
|
import { Transaction } from '@codemirror/state';
import type EditorStore from '../editor/EditorStore';
import {
type IOccurrence,
isCursorWithinOccurence,
} from '../editor/findOccurrences';
import Timer from '../utils/Timer';
import getLogger from '../utils/getLogger';
import type UpdateService from './UpdateService';
import type XtextWebSocketClient from './XtextWebSocketClient';
import {
isConflictResult,
OccurrencesResult,
type TextRegion,
} from './xtextServiceResults';
const FIND_OCCURRENCES_TIMEOUT_MS = 1000;
const log = getLogger('xtext.OccurrencesService');
function transformOccurrences(regions: TextRegion[]): IOccurrence[] {
const occurrences: IOccurrence[] = [];
regions.forEach(({ offset, length }) => {
if (length > 0) {
occurrences.push({
from: offset,
to: offset + length,
});
}
});
return occurrences;
}
export default class OccurrencesService {
private readonly store: EditorStore;
private readonly webSocketClient: XtextWebSocketClient;
private readonly updateService: UpdateService;
private hasOccurrences = false;
private readonly findOccurrencesTimer = new Timer(() => {
this.handleFindOccurrences();
}, FIND_OCCURRENCES_TIMEOUT_MS);
private readonly clearOccurrencesTimer = new Timer(() => {
this.clearOccurrences();
});
constructor(
store: EditorStore,
webSocketClient: XtextWebSocketClient,
updateService: UpdateService,
) {
this.store = store;
this.webSocketClient = webSocketClient;
this.updateService = updateService;
}
onTransaction(transaction: Transaction): void {
if (transaction.docChanged) {
// Must clear occurrences asynchronously from `onTransaction`,
// because we must not emit a conflicting transaction when handling the pending transaction.
this.clearOccurrencesTimer.schedule();
this.findOccurrencesTimer.reschedule();
return;
}
if (!transaction.isUserEvent('select')) {
return;
}
if (this.needsOccurrences) {
if (!isCursorWithinOccurence(this.store.state)) {
this.clearOccurrencesTimer.schedule();
this.findOccurrencesTimer.reschedule();
}
} else {
this.clearOccurrencesTimer.schedule();
}
}
private get needsOccurrences(): boolean {
return this.store.state.selection.main.empty;
}
private handleFindOccurrences() {
this.clearOccurrencesTimer.cancel();
this.updateOccurrences().catch((error) => {
log.error('Unexpected error while updating occurrences', error);
this.clearOccurrences();
});
}
private async updateOccurrences() {
if (!this.needsOccurrences) {
this.clearOccurrences();
return;
}
await this.updateService.update();
const result = await this.webSocketClient.send({
resource: this.updateService.resourceName,
serviceType: 'occurrences',
expectedStateId: this.updateService.xtextStateId,
caretOffset: this.store.state.selection.main.head,
});
const allChanges = this.updateService.computeChangesSinceLastUpdate();
if (!allChanges.empty || isConflictResult(result, 'canceled')) {
// Stale occurrences result, the user already made some changes.
// We can safely ignore the occurrences and schedule a new find occurrences call.
this.clearOccurrences();
this.findOccurrencesTimer.schedule();
return;
}
const parsedOccurrencesResult = OccurrencesResult.safeParse(result);
if (!parsedOccurrencesResult.success) {
log.error(
'Unexpected occurences result',
result,
'not an OccurrencesResult: ',
parsedOccurrencesResult.error,
);
this.clearOccurrences();
return;
}
const { stateId, writeRegions, readRegions } = parsedOccurrencesResult.data;
if (stateId !== this.updateService.xtextStateId) {
log.error(
'Unexpected state id, expected:',
this.updateService.xtextStateId,
'got:',
stateId,
);
this.clearOccurrences();
return;
}
const write = transformOccurrences(writeRegions);
const read = transformOccurrences(readRegions);
this.hasOccurrences = write.length > 0 || read.length > 0;
log.debug(
'Found',
write.length,
'write and',
read.length,
'read occurrences',
);
this.store.updateOccurrences(write, read);
}
private clearOccurrences() {
if (this.hasOccurrences) {
this.store.updateOccurrences([], []);
this.hasOccurrences = false;
}
}
}
|
