NodeJS code to convert a MD style formatting to a JS object

MD to Object

var fstool	= require('fs-tool');
var _		= require('underscore');
var path	= require('path');
var pstack	= require('pstack');


var log	= function(a,b) {
	console.log("#["+a+"]",JSON.stringify(b,null,4));
}

var converter	= function() {};
converter.prototype.download = function(mdFile, outputDir) {
	var scope		= this;
	this.mdFile		= mdFile;
	this.outputDir	= outputDir;
	
	// Read the file
	this.read(this.mdFile, function(data) {
		log("data",data);
		
		// Get the images with their names
		var labels	= scope.mapToLabels(data);
		log("labels",labels);
		
		// Download
		var stack	= new pstack();
		
		_.each(labels, function(jpath,url) {
			stack.add(function(done) {
				fstool.file.download(url, outputDir+'/'+jpath.join('-')+'.png', function(response) {
					log("Downloaded:", url);
					done();
				});
			});
		});
		
		stack.start(function() {
			log("Status", "Completed");
		});
		
	});
}
converter.prototype.mapToLabels = function(map, callback) {
	var output = {};
	this.labelExplorer([], map, output);
	var i;
	var n=0;
	for (i in output) {
		n++;
		output[i] = [n].concat(output[i]);
	}
	return output;
}
converter.prototype.labelExplorer = function(jpath, map, output) {
	
	var i;
	for (i in map) {
		if (_.isArray(map[i])) {
			// Array of images!
			_.each(map[i], function(img) {
				output[img]	= jpath.concat(i);
			});
		} else if(_.isObject(map[i])) {
			this.labelExplorer(jpath.concat(i), map[i], output);
		}
	}
	
	return output;
}
converter.prototype.read = function(filename, callback) {
	var scope = this;
	fstool.file.read(filename, function(content) {
		var lines	= content.split('\n');
		
		lines	= _.map(lines, function(line, n) {
			var chars	= line.split('');
			var i;
			var l	= chars.length;
			var t	= 0;
			for (i=0;i<l;i++) {
				if (chars[i]=='\t') {
					t++;
				} else {
					break;
				}
			}
			return {
				n:		n,
				t:		t,
				line:	line.replace(/[\t]./gmi,'').replace('- ','').trim()
			}
		});
		
		var data	= scope.convert(lines);
		
		callback(data);
	});
}
converter.prototype.convert = function(lines) {
	var scope = this;
	
	if (!lines || lines.length==0) {
		return false;
	}
	
	var baseLevel	= lines[0].t;
	var output		= {};
	
	lines	= _.map(lines, function(line, n) {
		line.n = n;
		return line;
	});
	// Find the base level
	_.each(lines, function(line, n) {
		if (line.t==baseLevel) {
			// Get the sublines that follow
			var temp	= [];
			var _k		= line.t+1;
			for (i=line.n+1;i<lines.length;i++) {
				if (lines[i].t>=_k) {
					temp.push(lines[i]);
					skipUntil = lines[i].n;
				} else {
					break;
				}
			}
			
			output[line.line]	= temp;
		}
	});
	
	for (i in output) {
		if (output[i] && output[i].length>0 && path.extname(output[i][0].line)=='.png') {
			// Images!
			output[i]	= _.map(output[i], function(item) {
				return item.line;
			});
		} else {
			if (output[i] && output[i].length>0) {
				output[i]	= scope.convert(output[i]);
			}
		}
	}
	
	return output;
}


var conv = new converter();
conv.download('test.md', 'output');