@thi.ng/parse/xform/print.js

Purely functional parser combinators & AST generation for generic inputs

import { xform } from "../combinators/xform.js";
import { __indent } from "../utils.js";
const xfPrint = (fn = console.log) => {
  const $print = (scope, _, level = 0) => {
    if (!scope) return;
    const prefix = __indent(level);
    const state = scope.state;
    const info = state ? ` (${state.l}:${state.c})` : "";
    fn(`${prefix}${scope.id}${info}: ${JSON.stringify(scope.result)}`);
    if (scope.children) {
      for (let c of scope.children) {
        $print(c, _, level + 1);
      }
    }
    return scope;
  };
  return $print;
};
const print = (parser, fn) => xform(parser, xfPrint(fn));
export {
  print,
  xfPrint
};