tell-me-when/util/ParseNode.mjs

human relative date and time parser

export class ParseNode {
  name;
  from;
  to;
  children;
  constructor(arg0, from, to, children) {
    if (arg0 instanceof ParseNode) {
      this.name = arg0.name;
      this.from = arg0.from;
      this.to = arg0.to;
      this.children = arg0.children;
    } else {
      if (from == null || to == null) {
        throw new Error(`from and to are required if first arg isn't a ParseNode`);
      }
      this.name = arg0;
      this.from = from;
      this.to = to;
      this.children = children;
    }
  }
  static error(from, to = from) {
    return new ParseNode('⚠', from, to);
  }
  static empty(index) {
    return new ParseNode(undefined, index, index);
  }
  substringOf(input) {
    return input.substring(this.from, this.to);
  }
  get isError() {
    return this.name === '⚠';
  }
  get isEmpty() {
    return this.from === this.to;
  }
  find(predicate) {
    for (const node of this.findAll(predicate)) {
      return node;
    }
    return undefined;
  }
  *findAll(predicate) {
    if (typeof predicate === 'string') {
      yield* this.findAll(node => node.name === predicate);
      return;
    }
    if (predicate.prototype instanceof ParseNode ? this instanceof predicate : predicate(this)) {
      yield this;
    }
    if (this.children) {
      for (const child of this.children) {
        yield* child.findAll(predicate);
      }
    }
  }
}
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