/*global CodeMirror */

CodeMirror.defineMode('scope', function (config, parserConfig) {

'use strict';

var levels = [], fullyParsed;

//lint the code to get the scope information

function getLevels() {

//this gets called a lot so check first

if (parserConfig.hasChanged()) {

levels = parserConfig.getLevels();

}

}

//get the level information

getLevels();

return {

startState: function () {

fullyParsed = false;

return {

line: 0,

index: 0

};

},

token: function (stream, state) {

var level, next;

//get the latest levels

getLevels();

//check for valid levels data

if (state.index < levels.length) {

//check stream for 'start of line'

if (stream.sol()) {

if (!fullyParsed) {

state.line += 1;

}

}

//get the level information

level = levels[state.index];

//check if we need to skip ahead

if((level.from - 1) > stream.pos) {

stream.pos += (level.from - stream.pos -1);

return null;

}

//move stream to scope change

stream.pos += (level.thru - level.from);

//check if this is the last line

if (state.index == levels.length) {

fullyParsed = true;

}

else

{

//step forward in the list

state.index += 1;

}

//return the CSS class to apply

return 'level' + level.level;

}

//handle race conditions

stream.skipToEnd();

return null;

}

};

});