@thi.ng/parse/combinators/repeat.js

Purely functional parser combinators & AST generation for generic inputs

import { discard } from "../xform/discard.js";
const repeat = (parser, min, max, id = "repeat") => (ctx) => {
  if (ctx.done) {
    return min < 1 ? ctx.addChild(id) : false;
  }
  ctx.start(id);
  for (let i = 0; i < max; i++) {
    if (!parser(ctx)) {
      if (i < min) {
        return ctx.discard();
      }
      break;
    }
  }
  return ctx.end();
};
const zeroOrMore = (parser, id = "repeat0", max = Infinity) => repeat(parser, 0, max, id);
const oneOrMore = (parser, id = "repeat1", max = Infinity) => repeat(parser, 1, max, id);
const repeatD = (parser, min, max) => discard(repeat(parser, min, max));
const zeroOrMoreD = (parser, max = Infinity) => repeatD(parser, 0, max);
const oneOrMoreD = (parser, max = Infinity) => repeatD(parser, 1, max);
export {
  oneOrMore,
  oneOrMoreD,
  repeat,
  repeatD,
  zeroOrMore,
  zeroOrMoreD
};