]> src.bluestatic.org Git - ustaxlib.git/blob - src/core/Trace.ts
Simplify the Trace API further.
[ustaxlib.git] / src / core / Trace.ts
1 // Copyright 2020 Blue Static <https://www.bluestatic.org>
2 // This program is free software licensed under the GNU General Public License,
3 // version 3.0. The full text of the license can be found in LICENSE.txt.
4 // SPDX-License-Identifier: GPL-3.0-only
5
6 import { Line } from './Line';
7
8 export type Edge = [string, string];
9
10 type Trace = { [key: string]: Edge };
11
12 var stack: string[] = [];
13
14 var current: Trace = null;
15 var previous: Trace = null;
16
17 export function begin(line: Line<any>) {
18 const name = formatLine(line);
19
20 if (current === null)
21 current = {} as Trace;
22
23 if (stack.length != 0)
24 addEdge([ previousEdge(), name ]);
25
26 stack.push(name);
27 }
28
29 export function mark(id: string) {
30 if (current === null)
31 return;
32 addEdge([ previousEdge(), id ]);
33 }
34
35 export function end() {
36 stack.pop();
37 if (stack.length == 0) {
38 previous = current;
39 current = null;
40 }
41 }
42
43 export function getLastTraceList(): readonly Edge[] {
44 if (previous === null)
45 return null;
46 return Object.values(previous);
47 }
48
49 function addEdge(e: Edge) {
50 current[`${e[0]}|${e[1]}`] = e;
51 }
52
53 function previousEdge(): string {
54 return stack[stack.length - 1];
55 }
56
57 function formatLine(line: Line<any>): string {
58 const description = line.description ? ` (${line.description})` : '';
59 if (line.form === undefined)
60 return `${line.constructor.name}${description}`;
61 return `${line.form.name}-${line.id}${description}`;
62 }