gcode.js

// boilerplate atkapi header
const InOut = require('../../lib/inout.js')
let Input = InOut.Input
let Output = InOut.Output

function Gcode() {

    // state
    this.state = {
    	mode: 'G0',
    	speeds: {
    		G0: 1200,
    		G1: 400
    	}
    }

    // local functions
    var getKeyValues = (str) => {
    	var kv = {}
        for (var i = 0; i < str.length; i++) {
            if (str[i].match('[A-Za-z]')) { // regex to match upper case letters
                var lastIndex = str.indexOf(' ', i)
                if (lastIndex < 0) {
                    lastIndex = str.length
                }
                var key = str[i].toUpperCase()
                kv[key] = parseFloat(str.slice(i + 1, lastIndex))
            }
        }
        return kv
    }

    var parseGcode = (str) => {
    	var instruction = {
    		position: {},
    		hasMove: false,
    		speed: 0
    	}

    	kv = getKeyValues(str)
    	// track modality
    	if(kv.G == 0 | kv.G == 1){
    		this.state.mode = 'G' + kv.G.toString()
    	} else if (kv.G != null) {
    		// no arcs pls
    		console.log('unfriendly Gcode mode!', kv)
    	}

    	for(key in kv){
    		if(key.match('[A-EX-Z]')){
    			instruction.position[key] = kv[key]
    			instruction.hasMove = true
    		} else if (key.match('[F]')){
    			this.state.speeds[this.state.mode] = kv.F
    		}
    	}

    	instruction.speed = this.state.speeds[this.state.mode]
    	// and this for help later?
    	instruction.kv = kv

    	return instruction
    }

    // input functions
    var lineIn = (str) => {
    	var instruction = parseGcode(str)
    	if (instruction.hasMove){
    		this.outputs.instructionOut.emit(instruction)
    	} else {
    		this.outputs.modeChange.emit(this.state.mode)
    	}
    }

    // ins and outs
    this.inputs = {
    	lineIn: new Input('string input', 'string', lineIn)
    }

    this.outputs = {
    	instructionOut: new Output('move instruction', 'object'),
    	modeChange: new Output('mode change', 'string')
    }
}


// export the module 
module.exports = Gcode