tell-me-when/util/ParseState.js

human relative date and time parser

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.ParseState = void 0;
exports.toRegExp = toRegExp;
class ParseState {
  index = 0;
  start;
  end;
  flags;
  constructor(input, {
    start = 0,
    end = input.length,
    flags = 'g'
  } = {}) {
    this.input = input;
    this.start = start;
    this.end = end;
    this.flags = flags;
  }
  get done() {
    return this.index >= this.end;
  }

  /**
   * If pattern matches the input at the current index, returns the match,
   * but doesn't advance the index.
   */
  peek(pattern) {
    if (typeof pattern === 'string') pattern = toRegExp(pattern);
    pattern = new RegExp(pattern.source, `${this.flags}${pattern.flags.replace(new RegExp(`[${this.flags}]`, 'g'), '')}`);
    pattern.lastIndex = this.index;
    const match = pattern.exec(this.input);
    return (match === null || match === void 0 ? void 0 : match.index) === this.index && match.index + match[0].length <= this.end ? match : undefined;
  }

  /**
   * If pattern matches the input at the current index, returns the match,
   * and advances the index to the end of the match.
   */
  match(pattern) {
    const match = this.peek(pattern);
    if (match) {
      this.index += match[0].length;
    }
    return match;
  }
}
exports.ParseState = ParseState;
function toRegExp(s, flags = '') {
  return new RegExp(s.replace(/[/\-\\^$*+?.()|[\]{}]/g, '\\$&'), flags);
}
//# sourceMappingURL=ParseState.js.map