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170 lines (154 loc) · 3.72 KB
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var stream = require('stream');
var util = require('util');
var parser = require('./parser');
var fs = require('fs');
var byline = require('byline');
// Strips spaces out of all incoming g-code except for comments
function GCodeScrubber() {
this.in_comment = false;
stream.Transform.call(this);
}
util.inherits(GCodeScrubber, stream.Transform);
GCodeScrubber.prototype._transform = function(s, enc, done) {
try {
for(var result = [], i=0, j=0; i<s.length; i++) {
var c = String.fromCharCode(s[i]);
var keep_result = true;
switch(c) {
case ' ':
case '\t':
keep_result = false;
break;
case '(':
if(this.in_comment) {
// ERROR
} else {
this.in_comment = true;
keep_result=false;
}
break;
case ')':
if(this.in_comment) {
this.in_comment = false;
keep_result=false;
} else {
// ERROR
}
default:
if(this.in_comment) { keep_result = false;}
break;
}
if(keep_result) {
result[j++] = c;
}
}
var output = result.join('');
this.push(output);
done();
} catch(e) {
console.log(e);
done();
}
}
function GCodeParser(options) {
if (!options) options = {};
options.objectMode = true;
stream.Transform.call(this, options);
}
util.inherits(GCodeParser, stream.Transform);
GCodeParser.prototype._transform = function (object, encoding, done) {
if(encoding === 'buffer') {
object = object.toString('utf8')
}
this.push(parser.parse(object));
done();
};
var Interpreter = function(options) {}
Interpreter.prototype._exec = function(cmd, args) {
if((cmd in this) && (typeof this[cmd] == 'function')) {
f = this[cmd].bind(this);
return f(args);
} else {
return this._(cmd, args);
}
}
Interpreter.prototype._ = function(cmd, args) {
return;
}
Interpreter.prototype._handle_line = function(line) {
var words = {}
line.words.forEach(function(word) {
var letter = word[0];
var arg = word[1];
switch(letter) {
case 'G':
case 'M':
break;
default:
words[letter] = arg;
break;
}
}.bind(this));
line.words.forEach(function(word) {
var letter = word[0];
var arg = word[1];
switch(letter) {
case 'G':
case 'M':
func = (letter + arg).replace('.','_').trim();
this._exec(func, words)
break;
default:
break;
}
}.bind(this));
}
Interpreter.prototype.interpretStream = function(st, callback) {
st.pipe(new GCodeScrubber())
.pipe(byline())
.pipe(new GCodeParser())
.on('data', function(line) {
this._handle_line(line);
}.bind(this))
.on('end', function() {
if(callback && typeof callback === 'function') {
callback.bind(this)(null);
}
}.bind(this));
}
Interpreter.prototype.interpretFile = function(file, callback) {
this.interpretStream(fs.createReadStream(file), callback);
}
Interpreter.prototype.interpretString = function(s, callback) {
var st = new stream.Readable();
st._read = function noop() {}; // redundant? see update below
st.push(s);
st.push(null);
return this.interpretStream(st, callback);
}
var parseStream = function(st, callback) {
var results = [];
st.pipe(new GCodeScrubber())
.pipe(byline())
.pipe(new GCodeParser())
.on('data', function(line) {
results.push(line);
})
.on('end', function() {
typeof callback === 'function' && callback(null, results);
});
}
var parseFile = function(file, callback) {
return parseStream(fs.createReadStream(file), callback)
}
var parseString = function(s, callback) {
var st = new stream.Readable();
st._read = function noop() {}; // redundant? see update below
st.push(s);
st.push(null);
return parseStream(st, callback)
}
module.exports.parseStream = parseStream;
module.exports.parseString = parseString;
module.exports.parseFile = parseFile;
module.exports.Interpreter = Interpreter;