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Filename : index.js
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'use strict';

var path = require('path');
var inspect = require('util').inspect;

function assertPath(path) {
  if (typeof path !== 'string') {
    throw new TypeError('Path must be a string. Received ' + inspect(path));
  }
}

function posix(path) {
  assertPath(path);
  if (path.length === 0)
    return '.';
  var code = path.charCodeAt(0);
  var hasRoot = (code === 47/*/*/);
  var end = -1;
  var matchedSlash = true;
  for (var i = path.length - 1; i >= 1; --i) {
    code = path.charCodeAt(i);
    if (code === 47/*/*/) {
      if (!matchedSlash) {
        end = i;
        break;
      }
    } else {
      // We saw the first non-path separator
      matchedSlash = false;
    }
  }

  if (end === -1)
    return hasRoot ? '/' : '.';
  if (hasRoot && end === 1)
    return '//';
  return path.slice(0, end);
}

function win32(path) {
  assertPath(path);
  var len = path.length;
  if (len === 0)
    return '.';
  var rootEnd = -1;
  var end = -1;
  var matchedSlash = true;
  var offset = 0;
  var code = path.charCodeAt(0);

  // Try to match a root
  if (len > 1) {
    if (code === 47/*/*/ || code === 92/*\*/) {
      // Possible UNC root

      rootEnd = offset = 1;

      code = path.charCodeAt(1);
      if (code === 47/*/*/ || code === 92/*\*/) {
        // Matched double path separator at beginning
        var j = 2;
        var last = j;
        // Match 1 or more non-path separators
        for (; j < len; ++j) {
          code = path.charCodeAt(j);
          if (code === 47/*/*/ || code === 92/*\*/)
            break;
        }
        if (j < len && j !== last) {
          // Matched!
          last = j;
          // Match 1 or more path separators
          for (; j < len; ++j) {
            code = path.charCodeAt(j);
            if (code !== 47/*/*/ && code !== 92/*\*/)
              break;
          }
          if (j < len && j !== last) {
            // Matched!
            last = j;
            // Match 1 or more non-path separators
            for (; j < len; ++j) {
              code = path.charCodeAt(j);
              if (code === 47/*/*/ || code === 92/*\*/)
                break;
            }
            if (j === len) {
              // We matched a UNC root only
              return path;
            }
            if (j !== last) {
              // We matched a UNC root with leftovers

              // Offset by 1 to include the separator after the UNC root to
              // treat it as a "normal root" on top of a (UNC) root
              rootEnd = offset = j + 1;
            }
          }
        }
      }
    } else if ((code >= 65/*A*/ && code <= 90/*Z*/) ||
               (code >= 97/*a*/ && code <= 122/*z*/)) {
      // Possible device root

      code = path.charCodeAt(1);
      if (path.charCodeAt(1) === 58/*:*/) {
        rootEnd = offset = 2;
        if (len > 2) {
          code = path.charCodeAt(2);
          if (code === 47/*/*/ || code === 92/*\*/)
            rootEnd = offset = 3;
        }
      }
    }
  } else if (code === 47/*/*/ || code === 92/*\*/) {
    return path[0];
  }

  for (var i = len - 1; i >= offset; --i) {
    code = path.charCodeAt(i);
    if (code === 47/*/*/ || code === 92/*\*/) {
      if (!matchedSlash) {
        end = i;
        break;
      }
    } else {
      // We saw the first non-path separator
      matchedSlash = false;
    }
  }

  if (end === -1) {
    if (rootEnd === -1)
      return '.';
    else
      end = rootEnd;
  }
  return path.slice(0, end);
}

module.exports = process.platform === 'win32' ? win32 : posix;
module.exports.posix = posix;
module.exports.win32 = win32;