src/Form.ts

   1 import TaxReturn from './TaxReturn';
   2 import { Line } from './Line';
   3 import { InconsistencyError, NotFoundError } from './Errors';
   4
   5 export default abstract class Form<I = unknown> {
   6   private _lines: Line<any>[] = [];
   7   private _input?: I;
   8
   9   abstract get name(): string;
  10
  11   readonly supportsMultipleCopies: boolean = false;
  12
  13   constructor(input?: I) {
  14     this._input = input;
  15     this.getLines().map(this.addLine.bind(this));
  16   }
  17
  18   protected abstract getLines(): Line<any>[];
  19
  20   private addLine(line: Line<any>) {
  21     if (line.form !== undefined) {
  22       throw new InconsistencyError('Line is already in a Form');
  23     }
  24     try {
  25       this.getLine(line.id);
  26     } catch {
  27       line.form = this;
  28       this._lines.push(line);
  29       return;
  30     }
  31     throw new InconsistencyError('Cannot add a line with a duplicate identifier');
  32   }
  33
  34   getLine(id: string): Line<any> {
  35     const lines = this._lines.filter(l => l.id === id);
  36     if (lines.length == 0) {
  37       throw new NotFoundError(id);
  38     }
  39     return lines[0];
  40   }
  41
  42   getValue<T>(tr: TaxReturn, id: string): T {
  43     const line: Line<T> = this.getLine(id);
  44     return line.value(tr);
  45   }
  46
  47   getInput<K extends keyof I>(name: K): I[K] {
  48     if (!(name in this._input)) {
  49       throw new NotFoundError(`No input with key ${name} on form ${this.name}`);
  50     }
  51     return this._input[name];
  52   }
  53 };