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 var current: Trace = null;
   9
  10 var traces: Trace[] = [];
  11
  12 export type Edge = [string, string];
  13
  14 export default class Trace {
  15   private _edges: { [key: string]: Edge } = {};
  16   private _stack: string[] = [];
  17   private _name: string;
  18
  19   constructor(line: Line<any>) {
  20     this._name = this._formatLine(line);
  21
  22     if (current === null)
  23       current = this;
  24
  25     if (current._stack.length != 0) {
  26       current._addEdge([ current._previousEdge(), this._name ]);
  27     }
  28
  29     current._stack.push(this._name);
  30   }
  31
  32   static add(id: string) {
  33     if (current === null)
  34       return;
  35     current._addEdge([ current._previousEdge(), id ]);
  36   }
  37
  38   end() {
  39     current._stack.pop();
  40     if (current === this) {
  41       current = null;
  42       traces.push(this);
  43     }
  44   }
  45
  46   get traceList(): readonly Edge[] {
  47     return Object.values(this._edges);
  48   }
  49
  50   private _addEdge(e: Edge) {
  51     this._edges[`${e[0]}|${e[1]}`] = e;
  52   }
  53
  54   private _previousEdge(): string {
  55     return this._stack[this._stack.length - 1];
  56   }
  57
  58   private _formatLine(line: Line<any>): string {
  59     const description = line.description ? ` (${line.description})` : '';
  60     if (line.form === undefined)
  61       return `${line.constructor.name}${description}`;
  62     return `${line.form.name}-${line.id}${description}`;
  63   }
  64 };
  65
  66 export function getLastTraceList(): readonly Edge[] {
  67   if (traces.length == 0)
  68     return null;
  69   return traces[traces.length - 1].traceList;
  70 }