scope.js

/*global CodeMirror */
CodeMirror.defineMode('scope', function (config, parserConfig) {
 'use strict';

 var levels = [], fullyParsed;

 //request levels from parserConfig
 function getLevels() {
 //this gets called a lot so check first
 if (parserConfig.hasChanged()) {
 levels = parserConfig.getLevels();
 }
 }

 function parseLine(stream, state) {
 var level;

 //get the latest levels
 getLevels();

 //check for valid levels data
 if (state.index < levels.length) {

 //check stream for 'start of line'
 if (stream.sol()) {
 state.line += 1;
 }

 //get the level information
 level = levels[state.index];

 //check if we need to skip the line
 if (state.line !== level.line) {
 //do nothing
 stream.skipToEnd();
 return null;
 }

 //check if we need to skip ahead within the line
 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);

 //step forward in the list
 state.index += 1;

 //return the CSS class to apply
 return 'level' + level.level;
 }
 //do nothing
 stream.skipToEnd();
 return null;
 }

 return {
 startState: function () {
 fullyParsed = false;
 return {
 //source code line
 line: 0,
 //levels array index
 index: 0
 };
 },
 token: function (stream, state) {
 return parseLine(stream, state);
 },
 blankLine: function(state) {
 return parseLine(new CodeMirror.StringStream(''), state);
 }
 };
});