improve turing.js

turing.js

@@ -1,5 +1,29 @@
+var step_delay = 0;
+var port = 35209;
+var verbose = false;
+var printtape = false;
+
+
+// TODO: Do better than this?
+var trans_done = 0;
+var tape_done = 0;
+
+
+var head_loc = 0;
+var state = 0;
+var tape = ["_"];
+var transitions = {};
+
+var steps = 0;
+
+var pretty_tape = "";
+
 var fs = require('fs');
 var readline = require('readline');
+var express = require('express');
+var web = express();
+
+
 var transitionReader = readline.createInterface({
     input: fs.createReadStream('transitions')
 });
@@ -8,20 +32,16 @@ var tapeReader = readline.createInterface({
 });
 
 transitionReader.on('line', function(line) {
-    console.log(line);
+    if (verbose) console.log(line);
     var file_transitions = line.split(/[\s,]/);
     
-    if (!transitions[file_transitions[0]]) {
+    if (!transitions[file_transitions[0]]) 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);
 });
 
 
@@ -32,7 +52,6 @@ transitionReader.on('close', function() {
 
 
 tapeReader.on('line', function(line) {
-    console.log("Lol");
     var symbols = line;
     for (var i = 0; i < symbols.length; i++) {
 	if (symbols[i] == " ") {
@@ -40,8 +59,6 @@ tapeReader.on('line', function(line) {
 	} else {
 	    tape[i+1] = symbols[i];
 	}
-	
-	console.log(tape);
     }
 });
 
@@ -51,71 +68,32 @@ tapeReader.on('close', function() {
 });
 
 
-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!");
+    steps++;
+    
+    if (verbose) console.log("START step");
 
     if (tape[head_loc] == undefined) {
 	tape[head_loc] = "_";
     }
 
+    if (verbose) {
+	pretty_tape = "";
+	for (i = 0; i < tape.length; i++) {
+	    if (i == head_loc) pretty_tape = pretty_tape + "[";
+	    pretty_tape = pretty_tape + tape[i];
+	    if (i == head_loc) pretty_tape = pretty_tape + "]";
+	}
+    }
+    if (verbose) console.log(pretty_tape);
 
     var cur_symbol = tape[head_loc];
 
-    console.log("Symbol: %s | State: %s",cur_symbol,state);
+    if (verbose) console.log("Symbol: %s | State: %s",cur_symbol,state);
 
-    //console.log(tape[head_loc]);
+    // Get the transition based on the current state and symbol
     var transition = transitions[state][cur_symbol];
-    console.log(transition);
 
     // Write to tape
     tape[head_loc] = transition.write;
@@ -130,19 +108,26 @@ var step = function() {
 	head_loc--;
     }
     
-    console.log("State: %s | Head: %s",state,head_loc)
+    if (verbose) console.log("State: %s | Head: %s",state,head_loc)
-    
+
+    // Throw error if head was moved over the left edge of the tape
     if (head_loc == -1) {
 	throw "head_loc error";
     }
 
-    console.log("Tape %s",tape);
+    if (printtape) console.log("Tape %s",tape);
-    setTimeout(step, step_time);
+    
+
+    if (verbose) console.log("END step!");
+    setTimeout(step, step_delay);
 }
 
 
 var prestep = function() {
+    // Check if the transitions and tape have been initialised
     if (trans_done == 1 && tape_done == 1) {
+	if (verbose) console.log(transitions);
+	if (verbose) console.log(tape);
 	console.log("Ready! Stepping!");
 	step();
     } else {
@@ -153,3 +138,18 @@ var prestep = function() {
 
 prestep();
 
+
+// Set up web server
+web.get('', function(req, res) {
+    var webtape = "";
+    for (i = 0; i < tape.length; i++) {
+	if (i == head_loc) webtape = webtape + "[";
+	webtape = webtape + tape[i];
+	if (i == head_loc) webtape = webtape + "]";
+    }
+    res.send(webtape + "<br><br>" + "Steps: " + steps);
+});
+
+web.listen(port, function () {
+    console.log("Server listening on port %s",port);
+});