Function computeNavigation

packages/router/src/create_url_tree.ts:270–319

Transforms commands to a normalized `Navigation`

(commands: readonly any[])

/** Transforms commands to a normalized `Navigation` */
function computeNavigation(commands: readonly any[]): Navigation {
  if (typeof commands[0] === 'string' && commands.length === 1 && commands[0] === '/') {
    return new Navigation(true, 0, commands);
  }

  let numberOfDoubleDots = 0;
  let isAbsolute = false;

  const res: any[] = commands.reduce((res, cmd, cmdIdx) => {
    if (typeof cmd === 'object' && cmd != null) {
      if (cmd.outlets) {
        const outlets: {[k: string]: any} = {};
        Object.entries(cmd.outlets).forEach(([name, commands]) => {
          outlets[name] = typeof commands === 'string' ? commands.split('/') : commands;
        });
        return [...res, {outlets}];
      }

      if (cmd.segmentPath) {
        return [...res, cmd.segmentPath];
      }
    }

    if (!(typeof cmd === 'string')) {
      return [...res, cmd];
    }

    if (cmdIdx === 0) {
      cmd.split('/').forEach((urlPart, partIndex) => {
        if (partIndex == 0 && urlPart === '.') {
          // skip './a'
        } else if (partIndex == 0 && urlPart === '') {
          //  '/a'
          isAbsolute = true;
        } else if (urlPart === '..') {
          //  '../a'
          numberOfDoubleDots++;
        } else if (urlPart != '') {
          res.push(urlPart);
        }
      });

      return res;
    }

    return [...res, cmd];
  }, []);

  return new Navigation(isAbsolute, numberOfDoubleDots, res);
}

class Position {
  constructor(