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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.import * as path from "./vendor/https/deno.land/std/path/mod.ts";/** * Find the match that appeared in the nearest position to the beginning of word. * If positions are same, the longest one will be picked. * Return -1 and null if no match found. * */export function findLongestAndNearestMatches(  pathname: string,  patterns: (string | RegExp)[],): [number, RegExpMatchArray][] {  let lastMatchIndex = pathname.length;  let lastMatchLength = 0;  let ret: [number, RegExpMatchArray][] = [];  for (let i = 0; i < patterns.length; i++) {    const pattern = patterns[i];    if (pattern instanceof RegExp) {      // Regex pattern always matches pathname in ignore case mode      const match = pathname.match(new RegExp(pattern, "i"));      if (!match || match.index == null) {        continue;      }      const { index } = match;      const [tgt] = match;      if (        index <= lastMatchIndex ||        (index === lastMatchIndex && tgt.length >= lastMatchLength)      ) {        if (tgt.length > lastMatchLength || index < lastMatchIndex) {          ret = [];        }        ret.push([i, match]);        lastMatchIndex = index;        lastMatchLength = tgt.length;      }    } else if (      // req.url is raw requested url string that      // may contain capitalized strings.      // However router compares them by normalized strings      // "/path" matches both  "/path" and "/Path".      pathname.toLowerCase() === pattern.toLowerCase() &&      pattern.length >= lastMatchLength    ) {      if (pattern.length > lastMatchLength) {        ret = [];      }      const reg = new RegExp(pathname, "i");      const match = pathname.match(reg)!;      ret.push([i, match]);      lastMatchIndex = 0;      lastMatchLength = pattern.length;    }  }  return ret;}
export async function resolveIndexPath(  dir: string,  pathname: string,  extensions: string[] = [".html"],): Promise<string | undefined> {  let filepath = path.join(dir, pathname);  const fileExists = async (s: string): Promise<boolean> => {    try {      const stat = await Deno.stat(s);      return stat.isFile;    } catch (e) {      return false;    } finally {    }  };  if (await fileExists(filepath)) {    return filepath;  }  for (const ext of extensions) {    if (      filepath.endsWith("/") &&      (await fileExists(path.resolve(filepath + "index" + ext)))    ) {      return filepath + "index" + ext;    } else if (await fileExists(path.resolve(filepath + ext))) {      return filepath + ext;    }  }}