/*
node-jsmin2
2012-10-07

Copyright (c) 2012 Todd Wolfson (todd@twolfson.com)

jsmin.c
2012-07-02

Copyright (c) 2002 Douglas Crockford (www.crockford.com)

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 shall be used for Good, not Evil.

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 JSMin(input) {
  const EOF = -1;

  var stdin = {
    'index': 0,
    'end': input.length,
    'read': function (len) {
      // For now only handle len = 1
      if (len !== 1) {
        throw new Error('You can only read one character from input at a time.');
      }

      // If we are at the end, return EOF (-1)
      var index = stdin.index;
      if (index === stdin.end) {
        return EOF;
      }

      // Read the input at our index
      var char = input[index];

      // Increment our index
      stdin.index = index + 1;

      // Return char
      return char;
    },
    'getIndex': function () {
      return stdin.index;
    },
    // Helper for verifying during dev
    'charAt': function (index) {
      return (index >= stdin.end) ? EOF : input.charAt(index);
    }
  };

  var map = {};
  var output = '';
  options = {
    'error': '',
    'stdout': {
      'write': function (str) {
        // Add the string to output
        output += str;
      },
      'writeFromIndex': function (index) {
        var char = '\n';

        // If we are at a positive index
        if (index >= 0) {
          // Grab the char from its index
          char = input.charAt(index);

          // Get the length of the current output
          var len = output.length;

          // Map the sourceIndex to the destIndex
          map[index] = len;
        }

        // Output the char to output
        output += char;
      }
    },
    'stderr': function (err) {
      // Add the error to output
      options.error += err;
    },
    'exit': function (code) {
      // Throw the collective error
      throw new Error(options.error);
    }
  };

  // Run jsminc
  jsminc(stdin, options);

  // Return the output and map
  var retObj = {
    'code': output,
    'codeMap': map
  };
  return retObj;
}


/* jsmin.c
2012-07-02

Copyright (c) 2002 Douglas Crockford (www.crockford.com)

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 shall be used for Good, not Evil.

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 jsminc(stdin, options) {
  // Fallback options
  options = options || {};

  // Grab stdout, stderr, exit, argc, and argv
  var stdout = options.stdout || console.log,
      stderr = options.stderr || console.error,
      exit = options.exit || process.exit,
      argc = options.argc || 0,
      argv = options.argv || [];

  // Generate fputs, fputc, getc, putc, fprintf
  var fputs = fputc = putc = function (str, stream) {
    stream.write(str);
  };

  var fprintf = function (stream, formatStr, input) {
    var outStr = formatStr.replace('%s', input);
    fputs(outStr, stream);
  };

  var getc = function () {
    return stdin.read(1);
  };

  function puti(index, stream) {
    stream.writeFromIndex(index);
  }

  // Begin normal jsmin.c code
  var EOF = -1;
  var theA;
  var theB;
  var theLookahead = EOF;
  var theX = EOF;
  var theY = EOF;
  var getIndex = -1;
  var peekIndex = -1;
  var nextIndex = -1;
  var theAIndex = -1;
  var theBIndex = -1;

  function geti(stream) {
    return stream.getIndex();
  }

  function getChar(index, stream) {
    var retVal = '\n';
    if (index >= 0) {
        retVal = stream.charAt(index);
    }

    return retVal;
  }

  function error(s) {
    fputs("JSMIN Error: ", stderr);
    fputs(s, stderr);
    fputc('\n', stderr);
    exit(1);
  }

  /* isAlphanum -- return true if the character is a letter, digit, underscore,
     dollar sign, or non-ASCII character.
  */
  function isAlphanum(c) {
    return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
      (c >= 'A' && c <= 'Z') || c === '_' || c === '$' || c === '\\' ||
      c > 126);
  }

  /* get -- return the next character from stdin. Watch out for lookahead. If
     the character is a control character, translate it to a space or
     linefeed.
  */

  function get() {
    var c = theLookahead;
        theLookahead = EOF;

    if (c === EOF) {
      getIndex = geti(stdin);
      c = getc(stdin);
      theY = theX;
      theX = c;
    }
    if (c >= ' ' || c === '\n' || c === EOF) {
      return c;
    }
    if (c === '\r') {
      return '\n';
    }
    return ' ';
  }


  /* peek -- get the next character without getting it. */
  function peek() {
    theLookahead = get();
    peekIndex = getIndex;
    return theLookahead;
  }


  /* next -- get the next character, excluding comments. peek() is used to see
     if a '/' is followed by a '/' or '*'.
   */
  function next() {
    var c = get();
    nextIndex = getIndex;
    if (c === '/') {
      switch (peek()) {
        case '/':
          for (;;) {
            c = get();
            nextIndex = getIndex;
          if (c <= '\n') {
            return c;
          }
        }
      case '*':
        get();
        nextIndex = getIndex;
        for (;;) {
          switch (get()) {
          case '*':
            if (peek() === '/') {
              get();
              nextIndex = getIndex;
              return ' ';
            }
            break;
          case EOF:
            error("Unterminated comment.");
          }
          nextIndex = getIndex;
        }
      default:
        return c;
      }
    }
    return c;
  }


  /* action -- do something! What you do is determined by the argument:
1 Output A. Copy B to A. Get the next B.
2 Copy B to A. Get the next B. (Delete A).
3 Get the next B. (Delete B).
action treats a string as a single character. Wow!
action recognizes a regular expression if it is preceded by ( or , or =.
*/

  function action(d) {
    switch (d) {
    case 1:
      puti(theAIndex, stdout);
      if (theA === theB && (theA === '+' || theA === '-') && theY !== theA) {
        putc(' ', stdout);
      }
    case 2:
      theA = theB;
      theAIndex = theBIndex;
      if (theA === '\'' || theA === '"' || theA === '`') {
        for (;;) {
          puti(theAIndex, stdout);
          theA = get();
          theAIndex = getIndex;
          if (theA === theB) {
            break;
          }
          if (theA === '\\') {
            puti(theAIndex, stdout);
            theA = get();
            theAIndex = getIndex;
          }
          if (theA === EOF) {
            error("Unterminated string literal.");
          }
        }
      }
    case 3:
      theB = next();
      theBIndex = nextIndex;
      if (theB === '/' && (theA === '(' || theA === ',' || theA === '=' ||
                theA === ':' || theA === '[' || theA === '!' ||
                theA === '&' || theA === '|' || theA === '?' ||
                theA === '{' || theA === '}' || theA === ';' ||
                theA === '\n')) {
        puti(theAIndex, stdout);
        puti(theBIndex, stdout);
        for (;;) {
          theA = get();
          theAIndex = getIndex;
          if (theA === '[') {
            for (;;) {
              puti(theAIndex, stdout);
              theA = get();
              theAIndex = getIndex;
              if (theA === ']') {
                break;
              }
              if (theA === '\\') {
                puti(theAIndex, stdout);
                theA = get();
                theAIndex = getIndex;
              }
              if (theA === EOF) {
                error("Unterminated set in Regular Expression literal.");
              }
            }
          } else if (theA === '/') {
            break;
          } else if (theA ==='\\') {
            puti(theAIndex, stdout);
            theA = get();
            theAIndex = getIndex;
          }
          if (theA === EOF) {
            error("Unterminated Regular Expression literal.");
          }
          puti(theAIndex, stdout);
        }
        theB = next();
        theBIndex = nextIndex;
      }
    }
  }


  /* jsmin -- Copy the input to the output, deleting the characters which are
     insignificant to JavaScript. Comments will be removed. Tabs will be
     replaced with spaces. Carriage returns will be replaced with linefeeds.
     Most spaces and linefeeds will be removed.
  */

  function jsmin() {
    if (peek() === 0xEF) {
      get();
      get();
      get();
    }
    theA = '\n';
    action(3);
    while (theA !== EOF) {
      switch (theA) {
      case ' ':
        if (isAlphanum(theB)) {
          action(1);
        } else {
          action(2);
        }
        break;
      case '\n':
        switch (theB) {
        case '{':
        case '[':
        case '(':
        case '+':
        case '-':
        case '!':
        case '~':
          action(1);
          break;
        case ' ':
          action(3);
          break;
        default:
          if (isAlphanum(theB)) {
            action(1);
          } else {
            action(2);
          }
        }
        break;
      default:
        switch (theB) {
        case ' ':
          if (isAlphanum(theA)) {
            action(1);
            break;
          }
          action(3);
          break;
        case '\n':
          switch (theA) {
          case '}':
          case ']':
          case ')':
          case '+':
          case '-':
          case '"':
          case '\'':
          case '`':
            action(1);
            break;
          default:
            if (isAlphanum(theA)) {
              action(1);
            } else {
              action(3);
            }
          }
          break;
        default:
          action(1);
          break;
        }
      }
    }
  }

  jsmin();
}

// Support commonjs.
if (module && module.exports) {
  module.exports = JSMin;
}