initial commit, it works

turing.js

@@ -0,0 +1,155 @@
+var fs = require('fs');
+var readline = require('readline');
+var transitionReader = readline.createInterface({
+    input: fs.createReadStream('transitions')
+});
+var tapeReader = readline.createInterface({
+    input: fs.createReadStream('tape')
+});
+
+transitionReader.on('line', function(line) {
+    console.log(line);
+    var file_transitions = line.split(/[\s,]/);
+    
+    if (!transitions[file_transitions[0]]) {
+	transitions[file_transitions[0]] = {};
+    }
+
+    transitions[file_transitions[0]][file_transitions[1]] = {
+	to:file_transitions[2],
+	write:file_transitions[3],
+	move:file_transitions[4]
+    };
+
+    console.log(transitions);
+});
+
+
+transitionReader.on('close', function() {
+    console.log("Done reading TRANSITIONS!");
+    trans_done = 1;
+});
+
+
+tapeReader.on('line', function(line) {
+    console.log("Lol");
+    var symbols = line;
+    for (var i = 0; i < symbols.length; i++) {
+	if (symbols[i] == " ") {
+	    tape[i+1] = "_";
+	} else {
+	    tape[i+1] = symbols[i];
+	}
+	
+	console.log(tape);
+    }
+});
+
+tapeReader.on('close', function() {
+    console.log("Done reading TAPE!");
+    tape_done = 1;
+});
+
+
+var step_time = 10;
+
+// TEMP SOLUTION
+var trans_done = 0;
+var tape_done = 0;
+// END TEMP
+
+
+var head_loc = 0;
+var state = 0;
+var tape = ["_"];
+
+var transitions = {};
+
+
+
+
+/*
+var readLines = function(input, func) {
+    var linesToRead = '';
+
+    input.on('data', function(data) {
+	linesToRead += data;
+	var index = linesToRead.indexOf('\n');
+	var last = 0;
+	while (index > -1) {
+	    var line = linesToRead.substring(last, index);
+	    last = index + 1;
+	    linesToRead = linesToRead.substring(index + 1);
+	    func(line);
+	    index = remaining.indexOf('\n');
+	}
+    });
+
+    input.on('end', function() {
+	if (linesToRead.length > 0) {
+	    func(remaining);
+	}
+    });
+}
+*/
+
+var initialiseTransitions = function(callback) {
+
+}
+
+var initialiseTape = function(callback) {
+    
+}
+
+var step = function() {
+    console.log("Step!");
+
+    if (tape[head_loc] == undefined) {
+	tape[head_loc] = "_";
+    }
+
+
+    var cur_symbol = tape[head_loc];
+
+    console.log("Symbol: %s | State: %s",cur_symbol,state);
+
+    //console.log(tape[head_loc]);
+    var transition = transitions[state][cur_symbol];
+    console.log(transition);
+
+    // Write to tape
+    tape[head_loc] = transition.write;
+
+    // Change state
+    state = transition.to;
+
+    // Move head
+    if (transition.move == 'R') {
+	head_loc++;
+    } else if (transition.move == 'L') {
+	head_loc--;
+    }
+    
+    console.log("State: %s | Head: %s",state,head_loc)
+    
+    if (head_loc == -1) {
+	throw "head_loc error";
+    }
+
+    console.log("Tape %s",tape);
+    setTimeout(step, step_time);
+}
+
+
+var prestep = function() {
+    if (trans_done == 1 && tape_done == 1) {
+	console.log("Ready! Stepping!");
+	step();
+    } else {
+	console.log("Not ready! Waiting 100 ms...");
+	setTimeout(prestep, 100);
+    }
+}
+
+prestep();
+