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<L extends { [key: string]: Line<any> },
   6                                    I = unknown> {
   7   abstract readonly name: string;
   8
   9   protected abstract readonly _lines: L;
  10
  11   readonly supportsMultipleCopies: boolean = false;
  12
  13   private readonly _input?: I;
  14
  15   constructor(input?: I) {
  16     this._input = input;
  17   }
  18
  19   getLine<K extends keyof L>(id: K): L[K] {
  20     if (!(id in this._lines))
  21       throw new NotFoundError(`Form ${this.name} does not have line ${id}`);
  22     const line = this._lines[id];
  23     // We cannot apply this to every line in the constructor because |_lines|
  24     // is abstract, so do it on getLine().
  25     line.form = this;
  26     return line;
  27   }
  28
  29   getValue<K extends keyof L>(tr: TaxReturn, id: K): ReturnType<L[K]['value']> {
  30     const line: L[K] = this.getLine(id);
  31     return line.value(tr);
  32   }
  33
  34   getInput<K extends keyof I>(name: K): I[K] {
  35     if (!(name in this._input)) {
  36       throw new NotFoundError(`No input with key ${name} on form ${this.name}`);
  37     }
  38     return this._input[name];
  39   }
  40 };