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

Purely functional parser combinators & AST generation for generic inputs

import { xform } from "../combinators/xform.js";
import { defContext } from "../context.js";
import { xfJoin } from "./join.js";
const xfNest = (parser) => (scope, ctx) => {
  if (!scope) return;
  const src = scope.result || xfJoin(scope.copy()).result;
  const inner = defContext(src, ctx.opts);
  const state = scope.state;
  if (state) {
    const istate = inner.scope.state;
    istate.l = state.l;
    istate.c = state.c;
  }
  if (parser(inner)) {
    scope.result = null;
    scope.children = inner.children;
  }
  return scope;
};
const nest = (outer, inner) => xform(outer, xfNest(inner));
export {
  nest,
  xfNest
};