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  • General Purpose Language to build a compiler for

    - by Brownie
    Inspired by Eric Sink's interview on the stackoverflow podcast I would like to build a full compiler in my spare time for the learning experience. My initial thought was to build a C compiler but I'm not sure whether it would take too much time. I am wondering if there is a smaller general purpose language that would be more appropriate to implement as a first compiler effort? Or is a C implementation doable on a reasonable timescale (200 hrs)? It is my intention to target the CLR.

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  • Language+IDE for teaching high school students?

    - by daveagp
    I'm investigating languages and IDEs for a project involving teaching high-school students (around grade 11). It will teach basics of programming as an introduction to computer science (e.g., including how numbers/strings/characters are represented, using procedures and arrays, control flow, a little bit of algorithms, only very basic I/O). The non-negotiable requirements for this project are: a free up-to-date cross-platform IDE (Win & Mac incl. 64-bit) with debug a compiler where it's easy to learn from your mistakes together with the IDE, a gentle installation+learning curve So far, the best options I see are the following. Are there others I should know about? I am giving a short explanation with each one to generally show what I am looking for. In order from most to least promising: Pascal + FreePascal IDE (it seems a little buggy but actively developed?) Python + Eclipse + PyDev (good but features are overwhelming/hard to navigate) Groovy + Eclipse ('') Python + IDLE (looks unnatural to do debugging, to me) Pascal + Lazarus (IDE overwhelming, e.g. not obvious how to "start from scratch") Preferably, as a rule of thumb, the language should be direct enough that you don't need to wrap every program in a class, don't need to reference a System object to println, etc. I tried a little bit to see if there is something in JavaScript or (non-Visual) Basic along the lines of what I want, but found nothing so far. I would say that C/C++/C#, Java, Ruby, Lisp, VB do not fit my criteria for languages for this project. To reiterate my questions: are any of those 5 options really awesome or un-awesome? Are there other options which are even MORE awesome? Anything for Basic or JavaScript which meets all of the criteria? Thanks!

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  • Error about 'invalid JSON' with couchDB view but the json's fine...

    - by Chris Huang-Leaver
    I am trying to setup the following view on CouchDB { "_id":"_design/id", "_rev":"1-9be2e55e05ac368da3047841f301203d", "language":"javascript", "views":{ "by_id":{ "map" : "function(doc) { emit(doc.id, doc)}" },"from_user_id":{ "map" : "function(doc) { if (doc.from_user_id) {emit(doc.from_user_id, doc)}}"}, "from_user":{ "map" : "function(doc) { if (doc.from_user) {emit(doc.from_user, doc)}}"}, "to_user_id":{ "map" : "function(doc) {if (doc.to_user_id){ emit(doc.to_user_id, doc)}}"}, "to_user":{ "map" : "function(doc) {if (doc.to_user){ emit(doc.to_user, doc)}}" }, "max_id":{ "map" : "function(doc) { if (doc.id) {emit(doc._id, eval(doc.id))}}", "reduce" :"function(key,value) { a = value[0]; for (i=1; i <value.length; ++i){a = Math.max(a,value[i])} return a}" } } } when I try to 'PUT' this using curl: curl -X PUT -d keys.json $CDB/_design/id {"error":"bad_request","reason":"invalid UTF-8 JSON"} I know it's not invalid JSON, because I tested it using the 'json' library built into Python 2.6, it loads fine. JS screw ups give me the error 'must evaluate to a function' What else might be wrong with it?

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  • What are modern and old compilers written in?

    - by ulum
    As a compiler, other than an interpreter, only needs to translate the input and not run it the performance of itself should be not that problematic as with an interpreter. Therefore, you wouldn't write an interpreter in, let's say Ruby or PHP because it would be far too slow. However, what about compilers? If you would write a compiler in a scripting language maybe even featuring rapid development you could possibly cut the source code and initial development time by halv, at least I think so. To be sure: With scripting language I mean interpreted languages having typical features that make programming faster, easier and more enjoyable for the programmer, usually at least. Examples: PHP, Ruby, Python, maybe JavaScript though that may be an odd choice for a compiler What are compilers normally written in? As I suppose you will respond with something low-level like C, C++ or even Assembler, why? Are there compilers written in scripting languages? What are the (dis)advantages of using low or high level programming languages for compiler writing?

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  • i want to wrap the image as well text around the products like mug, t Shirt, crystals

    - by Sachin jain
    I am working on shopping cart. pls follow the link www.photohaat.com In the mug section whenever the user upload the image i want to wrap the complete image onto the mug so that he/she will saw the final output immediately. we develop this shopping cart on PHP language. I am trying to resolve this problem but unfortunately can't get a success. If you have any solutions regarding this than please let me know. Thanks & Regards Sachin Jain

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  • how u guys learn coding and programming

    - by dramasea
    Hi, I am a newbie on programming and currently still learning. Can you contribute your opinion on how to learn that faster. I learn every single element of the language such as Javascript date object methods and properties: http://www.w3schools.com/jsref/jsref_obj_date.asp but it is pretty much all the same, should i read through it? or i just left it. You know that's very boring with just reading. So, can I ask those professional programmer, do you also read these when you learn programming?

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  • geocode webservice address parameter written in another language

    - by nicholas
    Dear fellow Programmers, I try to use the following google map webservice in order to locate greek addresses: http://maps.google.com/maps/api/geocode/json?address=??ad?µ?a? 16&sensor=false and it does not work. If I hit the same exactly address but written with latin alphabet characters: maps.google.com/maps/api/geocode/json?address=akadimias 16&sensor=false, it works and returns the right result. Could somebody help with this? (To use this service with greek letters as language parameter) Thank you in advance, Nicholas

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  • Java language features which have no equivalent in C#

    - by jthg
    Having mostly worked with C#, I tend to think in terms of C# features which aren't available in Java. After working extensively with Java over the last year, I've started to discover Java features that I wish were in C#. Below is a list of the ones that I'm aware of. Can anyone think of other Java language features which a person with a C# background may not realize exists? The articles http://www.25hoursaday.com/CsharpVsJava.html and http://en.wikipedia.org/wiki/Comparison_of_Java_and_C_Sharp give a very extensive list of differences between Java and C#, but I wonder whether I missed anything in the (very) long articles. I can also think of one feature (covariant return type) which I didn't see mentioned in either article. Please limit answers to language or core library features which can't be effectively implemented by your own custom code or third party libraries. Covariant return type - a method can be overridden by a method which returns a more specific type. Useful when implementing an interface or extending a class and you want a method to override a base method, but return a type more specific to your class. Enums are classes - an enum is a full class in java, rather than a wrapper around a primitive like in .Net. Java allows you to define fields and methods on an enum. Anonymous inner classes - define an anonymous class which implements a method. Although most of the use cases for this in Java are covered by delegates in .Net, there are some cases in which you really need to pass multiple callbacks as a group. It would be nice to have the choice of using an anonymous inner class. Checked exceptions - I can see how this is useful in the context of common designs used with Java applications, but my experience with .Net has put me in a habit of using exceptions only for unrecoverable conditions. I.E. exceptions indicate a bug in the application and are only caught for the purpose of logging. I haven't quite come around to the idea of using exceptions for normal program flow. strictfp - Ensures strict floating point arithmetic. I'm not sure what kind of applications would find this useful. fields in interfaces - It's possible to declare fields in interfaces. I've never used this. static imports - Allows one to use the static methods of a class without qualifying it with the class name. I just realized today that this feature exists. It sounds like a nice convenience.

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  • jquery animate and image resize flickering

    - by denadai2
    Hi, i've a problem with a resize effect that i've done in http://www.mcz-scenario.it. When you click on a language, you can see the "background" image transferring into a certain position of the screen. this is the image: <img id="lago" src="http://www.mcz-scenario.it/images/lago.jpg" height="1070" width="1600" alt="lago" /> And this is the "resize" effect $("#lago").animate({ height: 148, width: 264, top: endPosition2.top+42, left: endPosition2.left+350+26}, 4000); Now... I see some flickering running this animation in Firefox. How can i handle this? Is it normal because the image is too large? Help me please :( THX

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  • What's your take on the programming language Go?

    - by fbrereto
    I've just been told about a new programming language, Go, developed at Google by such notables as Ken Thompson and Rob Pike. Does anyone have any experience with it so far? What are your thoughts about how viable small- and large-scale applications could be developed with it? Relevant links (thanks to Lance Roberts; feel free to update these as necessary): Ars-Technica PC World Google Open Source Blog Tech Talk Video Go Mailing List

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  • Gantt Chart online

    - by Luca
    I need to insert a horizontal bar chart in a web page. The thing I have to do is very similar to a Gantt Chart. I'd like to use a javascript library for the purpose. I tried jsgantt, but actually it is not very beautiful. I could evaluate also a server generation of the graph. In case my server side language is Python. It will be part of an internal project with no internet access, so Google Charts isn't an option.

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  • Needed list of special characters classification with respective characters

    - by pravin
    I am working on one web application , It's related to machine translation support i.e. which takes source text for translation and translated in to user specified language Currently it's in unit testing phase. Here, i want to check that, whether my machine translation feature is fully working for all the special characters. Because of different test cases I stuck at one point where i need all the special characters with classification. I needed all the special characters listing with classification. e.g. 1st : class name : Punctuation Characters : !?,"| etc test cases : segment1? segment2! segment3. 2nd : Class name : HTML entities characters : all the characters which belong under this class test cases : respective test cases 3rd : Class name : Extended ASCII characters :all the characters which belong under this class test cases : respective test cases Please folks provide this, if anyone has any idea or links so that i can make product perfect Thanks a lot

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  • Ajax/PHP contact form not able to send mail

    - by Steph
    The funny thing is it did work for one evening. I contacted my host, and they are saying there's no reason it should not be working. I have also attempted to test it in Firebug, but it seemed to be sending. And I specifically put the email address (hosted in my domain) on my email safe list, so that is not the culprit either. Would anyone here take a look at it for me? I'd be so grateful. In the header I have: <script type="text/javascript"> $(document).ready(function() { var options = { target: '#alert' }; $('#contactForm').ajaxForm(options); }); $.fn.clearForm = function() { return this.each(function() { var type = this.type, tag = this.tagName.toLowerCase(); if (tag == 'form') return $(':input',this).clearForm(); if (type == 'text' || type == 'password' || tag == 'textarea') this.value = ''; else if (type == 'checkbox' || type == 'radio') this.checked = false; else if (tag == 'select') this.selectedIndex = -1; }); }; </script> Here is the actual form: <form id="contactForm" method="post" action="sendmail.php"> <fieldset> <p>Email Me</p> <div id="fieldset_container"> <label for="name">Your Name:</label> <input type="text" name="name" id="name" /><br /><br /> <label for="email">Email:</label> <input type="text" name="email" id="email" /><br /><br /> <span style="display:none;"> <label for="last">Honeypot:</label> <input type="text" name="last" value="" id="last" /> </span><br /><br /> <label for="message">Comments &amp; Inquiries:</label> <textarea name="message" id="message" cols="" rows=""></textarea><br/> </div> <div id="submit_button"> <input type="submit" name="submit" id="submit" value="Send It" /> </div> </fieldset> </form> <div class="message"><div id="alert"></div></div> Here is the code from my validating page, sendmail.php: <?php // Who you want to recieve the emails from the form. (Hint: generally you.) $sendto = '[email protected]'; // The subject you'll see in your inbox $subject = 'SH Contact Form'; // Message for the user when he/she doesn't fill in the form correctly. $errormessage = 'There seems to have been a problem. May I suggest...'; // Message for the user when he/she fills in the form correctly. $thanks = "Thanks for the email!"; // Message for the bot when it fills in in at all. $honeypot = "You filled in the honeypot! If you're human, try again!"; // Various messages displayed when the fields are empty. $emptyname = 'Entering your name?'; $emptyemail = 'Entering your email address?'; $emptymessage = 'Entering a message?'; // Various messages displayed when the fields are incorrectly formatted. $alertname = 'Entering your name using only the standard alphabet?'; $alertemail = 'Entering your email in this format: <i>[email protected]</i>?'; $alertmessage = "Making sure you aren't using any parenthesis or other escaping characters in the message? Most URLS are fine though!"; //Setting used variables. $alert = ''; $pass = 0; // Sanitizing the data, kind of done via error messages first. Twice is better! ;-) function clean_var($variable) { $variable = strip_tags(stripslashes(trim(rtrim($variable)))); return $variable; } //The first if for honeypot. if ( empty($_REQUEST['last']) ) { // A bunch of if's for all the fields and the error messages. if ( empty($_REQUEST['name']) ) { $pass = 1; $alert .= "<li>" . $emptyname . "</li>"; } elseif ( ereg( "[][{}()*+?.\\^$|]", $_REQUEST['name'] ) ) { $pass = 1; $alert .= "<li>" . $alertname . "</li>"; } if ( empty($_REQUEST['email']) ) { $pass = 1; $alert .= "<li>" . $emptyemail . "</li>"; } elseif ( !eregi("^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$", $_REQUEST['email']) ) { $pass = 1; $alert .= "<li>" . $alertemail . "</li>"; } if ( empty($_REQUEST['message']) ) { $pass = 1; $alert .= "<li>" . $emptymessage . "</li>"; } elseif ( ereg( "[][{}()*+?\\^$|]", $_REQUEST['message'] ) ) { $pass = 1; $alert .= "<li>" . $alertmessage . "</li>"; } //If the user err'd, print the error messages. if ( $pass==1 ) { //This first line is for ajax/javascript, comment it or delete it if this isn't your cup o' tea. echo "<script>$(\".message\").hide(\"slow\").show(\"slow\"); </script>"; echo "<b>" . $errormessage . "</b>"; echo "<ul>"; echo $alert; echo "</ul>"; // If the user didn't err and there is in fact a message, time to email it. } elseif (isset($_REQUEST['message'])) { //Construct the message. $message = "From: " . clean_var($_REQUEST['name']) . "\n"; $message .= "Email: " . clean_var($_REQUEST['email']) . "\n"; $message .= "Message: \n" . clean_var($_REQUEST['message']); $header = 'From:'. clean_var($_REQUEST['email']); //Mail the message - for production mail($sendto, $subject, $message, $header, "[email protected]"); //This is for javascript, echo "<script>$(\".message\").hide(\"slow\").show(\"slow\").animate({opacity: 1.0}, 4000).hide(\"slow\"); $(':input').clearForm() </script>"; echo $thanks; die(); //Echo the email message - for development echo "<br/><br/>" . $message; } //If honeypot is filled, trigger the message that bot likely won't see. } else { echo "<script>$(\".message\").hide(\"slow\").show(\"slow\"); </script>"; echo $honeypot; } ?>

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  • generalizing the pumping lemma for UNIX-style regular expressions

    - by Avi
    Most UNIX regular expressions have, besides the usual *,+,? operators a backslash operator where \1,\2,... match whatever's in the last parentheses, so for example L=(a)b\1* matches the (non regular) language a^n b a^n On one hand, this seems to be pretty powerful since you can create (a*)b\1b\1 to match the language a^n b a^n b a^n which can't even be recognized by a stack automaton. On the other hand, I'm pretty sure a^n b^n cannot be expressed this way. Two questions: 1. Is there any literature on this family of languages (UNIX-y regular). In particular, is there a version of the pumping lemma for these? 2. Can someone prove (or perhaps disprove) that a^n b^n cannot be expressed this way? Thanks

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  • Hidden Features of HTML

    - by Binoj Antony
    HTML being the most widely used language (at least as a markup language) has not gotten its due credit. Considering that it has been around for so many years, things like the FORM / INPUT controls have still remained same with no new controls added. So at least from the existing features, do you know any that are not well known but very useful. Of course, this question is along the lines of: Hidden Features of JavaScript Hidden Features of CSS Hidden Features of C# Hidden Features of VB.NET Hidden Features of Java Hidden Features of ASP.NET Hidden Features of Python Hidden Features of TextPad Hidden Features of Eclipse Do not mention features of HTML 5.0, since it is in working draft Please specify one feature per answer.

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  • How to split a string by ',' or '[|]' unless the ',' is in '{}'

    - by floyddotnet
    i search for a regex to split the following string: aaa[bbb,ccc[ddd,{eee:1,mmm:999}],nnn[0,3]] aaa[bbb,ccc[ddd,{eee:1, mmm:[123,555]}],nnn[0,3]] aaa[bbb, ccc[ddd, ddd],nnn[0,3]] aaa[bbb,ddd[0,3]] by '[' or ']' or ',' unless the ',' is in '{}'. As example: split 'aaa[bbb,ccc[ddd,' to aaa, bbb, ccc, ddd is allow but not {eee:1,mmm:999}. the result: aaa, bbb, ccc, ddd, {eee:1,mmm:999}, nnn, 0, 3 aaa, bbb, ccc, ddd, {eee:1, mmm:[123,555]}], nnn, 0, 3 aaa, bbb, ccc, ddd, ddd, nnn, 0, 3 aaa, bbb, ddd, 0, 3 i have read meany other questions but i cant modifie the regex's there are post to do this what i want. the target language for the expression is javascript.

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