gcode-parser.js

/**
 * Parses a string of gcode instructions, and invokes handlers for
 * each type of command.
 *
 * Special handler:
 *   'default': Called if no other handler matches.
 */
function GCodeParser(handlers) {
  this.handlers = handlers || {};
}

GCodeParser.prototype.parseLine = function(text, info) {
  text = text.replace(/;.*$/, '').trim(); // Remove comments
  if (text) {
    var tokens = text.split(' ');
    if (tokens) {
      var cmd = tokens[0];
      var args = {
        'cmd': cmd
      };
      tokens.splice(1).forEach(function(token) {
        var key = token[0].toLowerCase();
        var value = parseFloat(token.substring(1));
        args[key] = value;
      });
      var handler = this.handlers[tokens[0]] || this.handlers['default'];
      if (handler) {
        return handler(args, info);
      }
    }
  }
};

GCodeParser.prototype.parse = function(gcode) {
  var lines = gcode.split('\n');
  for (var i = 0; i < lines.length; i++) {
    //console.log(lines[i]);
    if (this.parseLine(lines[i], i) === false) {
      break;
    }
  }
};