dustin-H/bauhaus-ui

/*
This path matching algorithm is a copy from [react-router](https://github.com/rackt/react-router/blob/master/modules/PatternUtils.js)

Thanks to
 - @mjackson
 - @taion
 - @ryanflorence
 - @brenoc

Great work!



LICENSE:

The MIT License (MIT)

Copyright (c) 2015 Ryan Florence, Michael Jackson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
 merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
}

function escapeSource(string) {
  return escapeRegExp(string).replace(/\/+/g, '/+')
}

function _compilePattern(pattern) {
  let regexpSource = ''
  const paramNames = []
  const tokens = []

  let match,
    lastIndex = 0,
    matcher = /:([a-zA-Z_$][a-zA-Z0-9_$]*)|\*\*|\*|\(|\)/g
  while ((match = matcher.exec(pattern))) {
    if (match.index !== lastIndex) {
      tokens.push(pattern.slice(lastIndex, match.index))
      regexpSource += escapeSource(pattern.slice(lastIndex, match.index))
    }

    if (match[1]) {
      regexpSource += '([^/?#]+)'
      paramNames.push(match[1])
    } else if (match[0] === '**') {
      regexpSource += '([\\s\\S]*)'
      paramNames.push('splat')
    } else if (match[0] === '*') {
      regexpSource += '([\\s\\S]*?)'
      paramNames.push('splat')
    } else if (match[0] === '(') {
      regexpSource += '(?:'
    } else if (match[0] === ')') {
      regexpSource += ')?'
    }

    tokens.push(match[0])

    lastIndex = matcher.lastIndex
  }

  if (lastIndex !== pattern.length) {
    tokens.push(pattern.slice(lastIndex, pattern.length))
    regexpSource += escapeSource(pattern.slice(lastIndex, pattern.length))
  }

  return {
    pattern,
    regexpSource,
    paramNames,
    tokens
  }
}


var CompiledPatternsCache = {}

function compilePattern(pattern) {
  if (!(pattern in CompiledPatternsCache))
    CompiledPatternsCache[pattern] = _compilePattern(pattern)

  return CompiledPatternsCache[pattern]
}

function matchPattern(pattern, pathname) {
  // Make leading slashes consistent between pattern and pathname.
  if (pattern.charAt(0) !== '/') {
    pattern = `/${pattern}`
  }
  if (pathname.charAt(0) !== '/') {
    pathname = `/${pathname}`
  }

  let {regexpSource, paramNames, tokens} = compilePattern(pattern)

  regexpSource += '/*' // Capture path separators

  // Special-case patterns like '*' for catch-all routes.
  const captureRemaining = tokens[tokens.length - 1] !== '*'

  if (captureRemaining) {
    // This will match newlines in the remaining path.
    regexpSource += '([\\s\\S]*?)'
  }

  const match = pathname.match(new RegExp('^' + regexpSource + '$', 'i'))

  let remainingPathname,
    paramValues
  if (match != null) {
    if (captureRemaining) {
      remainingPathname = match.pop()
      const matchedPath = match[0].substr(0, match[0].length - remainingPathname.length)

      // If we didn't match the entire pathname, then make sure that the match
      // we did get ends at a path separator (potentially the one we added
      // above at the beginning of the path, if the actual match was empty).
      if (
        remainingPathname &&
        matchedPath.charAt(matchedPath.length - 1) !== '/'
      ) {
        return {
          remainingPathname: null,
          paramNames,
          paramValues: null
        }
      }
    } else {
      // If this matched at all, then the match was the entire pathname.
      remainingPathname = ''
    }

    paramValues = match.slice(1).map(
      v => v != null ? decodeURIComponent(v) : v
    )
  } else {
    remainingPathname = paramValues = null
  }

  return {
    remainingPathname,
    paramNames,
    paramValues
  }
}

export default matchPattern