src/Form.ts

   1 import { Line } from './Line';
   2 import { InconsistencyError, NotFoundError } from './Errors';
   3
   4 export default abstract class Form<I = unknown> {
   5   private _lines: Line<any>[] = [];
   6   private _input?: I;
   7
   8   abstract get name(): string;
   9
  10   constructor(input?: I) {
  11     this._input = input;
  12     this.getLines().map(this.addLine.bind(this));
  13   }
  14
  15   protected abstract getLines(): Line<any>[];
  16
  17   get allowMultipleCopies(): boolean {
  18     return false;
  19   }
  20
  21   private addLine(line: Line<any>) {
  22     if (line.form !== undefined) {
  23       throw new InconsistencyError('Line is already in a Form');
  24     }
  25     try {
  26       this.getLine(line.id);
  27     } catch {
  28       line.form = this;
  29       this._lines.push(line);
  30       return;
  31     }
  32     throw new InconsistencyError('Cannot add a line with a duplicate identifier');
  33   }
  34
  35   getLine(id: string): Line<any> {
  36     const lines = this._lines.filter(l => l.id === id);
  37     if (lines.length == 0) {
  38       throw new NotFoundError(id);
  39     }
  40     return lines[0];
  41   }
  42
  43   getInput<K extends keyof I>(name: K): I[K] {
  44     if (!(name in this._input)) {
  45       throw new NotFoundError(`No input with key ${name} on form ${this.name}`);
  46     }
  47     return this._input[name];
  48   }
  49 };