CoffeeScript - parse PeopleSoft project XML export file

psprojectparser.coffee

path = require 'path'
fs = require 'fs'
expat = require 'node-expat'

#
# peoplesoft XML project file parser - similar to:
# python version: https://github.com/swiatczak/psprojectparser
#
# just playing with class construction and chaining of the methods
#
# References: http://coffeescriptcookbook.com/chapters/classes_and_objects/chaining
# http://arcturo.github.io/library/coffeescript/03_classes.html
#
# After reading - http://stackoverflow.com/questions/18691826/new-to-node-js-and-im-not-sure-if-im-doing-this-correct
#               - I started thinking about perhaps trying to think in terms of callbacks and logic chunks - rather than 
#                 convenience and making it all look like Python or Java
#

class ProjectParser
   
    startRE = /<instance class="(.*)">/ig
    endRE =  /<\/instance>/i

    # creates a chained accessor methods for each property defined
    @chained: (obj, attr) ->
        (newValues...) ->
            if newValues.length == 0
                obj.properties[attr]
            else
                obj.properties[attr] = newValues[0]
                obj 
    #
    constructor: ->
        @properties=
            prjfile: ''
            wrkfldr: ''
            outfldr: ''
    
        this[a] = ProjectParser.chained(this, a) for a of @properties
        
    # parse file
    parseSection: (section) =>
        console.log section.type

    addSection: (section) =>
        @sections = @sections || []
        @sections.push(section)
        

    getSections: (err, data) =>
        throw err if err 
        lines = data.split('\n')
        section = ""
        inSection = false
        sectType = ""
        if lines
            for line in lines
                grp = startRE.exec(line)
                if grp
                    inSection = true
                    sectType = grp[1]
                    section = line
                else 
                    if inSection
                        if line.match(endRE)                        
                            section = section + "\n" + line
                            @addSection({section: section, type: sectType })
                            @parseSection({section: section, type: sectType })                            
                            section = ""
                            inSection = false
                        else
                            section = section + "\n" + line

    # read project file
    readFile: =>        
        path = path.join(@wrkfldr(), @prjfile())
        fs.readFile(path, 'utf8', @getSections)

pp = new ProjectParser().prjfile('UA_H_WA_JI_012_29833.XML').wrkfldr('data/UA_H_WA_JI_012_29833').outfldr('data/UA_H_WA_JI_012_29833/out')
pp.readFile()