/* Just enough of CodeMirror to run runMode under node.js */



function splitLines(string){ return string.split(/\r?\n|\r/); };



function StringStream(string) {

  this.pos = this.start = 0;

  this.string = string;

}

StringStream.prototype = {

  eol: function() {return this.pos >= this.string.length;},

  sol: function() {return this.pos == 0;},

  peek: function() {return this.string.charAt(this.pos) || null;},

  next: function() {

    if (this.pos < this.string.length)

      return this.string.charAt(this.pos++);

  },

  eat: function(match) {

    var ch = this.string.charAt(this.pos);

    if (typeof match == "string") var ok = ch == match;

    else var ok = ch && (match.test ? match.test(ch) : match(ch));

    if (ok) {++this.pos; return ch;}

  },

  eatWhile: function(match) {

    var start = this.pos;

    while (this.eat(match)){}

    return this.pos > start;

  },

  eatSpace: function() {

    var start = this.pos;

    while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;

    return this.pos > start;

  },

  skipToEnd: function() {this.pos = this.string.length;},

  skipTo: function(ch) {

    var found = this.string.indexOf(ch, this.pos);

    if (found > -1) {this.pos = found; return true;}

  },

  backUp: function(n) {this.pos -= n;},

  column: function() {return this.start;},

  indentation: function() {return 0;},

  match: function(pattern, consume, caseInsensitive) {

    if (typeof pattern == "string") {

      function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}

      if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {

        if (consume !== false) this.pos += pattern.length;

        return true;

      }

    }

    else {

      var match = this.string.slice(this.pos).match(pattern);

      if (match && consume !== false) this.pos += match[0].length;

      return match;

    }

  },

  current: function(){return this.string.slice(this.start, this.pos);}

};

exports.StringStream = StringStream;



exports.startState = function(mode, a1, a2) {

  return mode.startState ? mode.startState(a1, a2) : true;

};



var modes = exports.modes = {}, mimeModes = exports.mimeModes = {};

exports.defineMode = function(name, mode) { modes[name] = mode; };

exports.defineMIME = function(mime, spec) { mimeModes[mime] = spec; };

exports.getMode = function(options, spec) {

  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))

    spec = mimeModes[spec];

  if (typeof spec == "string")

    var mname = spec, config = {};

  else if (spec != null)

    var mname = spec.name, config = spec;

  var mfactory = modes[mname];

  if (!mfactory) throw new Error("Unknown mode: " + spec);

  return mfactory(options, config || {});

};



exports.runMode = function(string, modespec, callback) {

  var mode = exports.getMode({indentUnit: 2}, modespec);

  var lines = splitLines(string), state = exports.startState(mode);

  for (var i = 0, e = lines.length; i < e; ++i) {

    if (i) callback("\n");

    var stream = new exports.StringStream(lines[i]);

    while (!stream.eol()) {

      var style = mode.token(stream, state);

      callback(stream.current(), style, i, stream.start);

      stream.start = stream.pos;

    }

  }

};

