It is also ideal for teaching most aspects of combinatorial problem solving, e. It contains several constraint solver libraries, a high-level modelling and control language, interfaces to third-party solvers, an integrated development environment and interfaces for embedding into host environments. July Build 7. A new version of the Python interface by Oreste Bernardi has also been released.
This book is the second volume by the author on Prolog programming and its applications written for Ventus. Whereas in the first book , specific Prolog programming techniques were explained, in this volume we discuss some areas where Prolog can be fruitfully employed. Both books owe their existence to the recognition that the higher educational system in the UK does not offer enough opportunities for students to experience the satisfaction associated with successfully completing a technical task.
Many interesting hurdles are identified and solved thereby. The availability of unification as a pattern matching tool makes Prolog uniquely suitable for solving such problems. Book Site. Book Description This book is the second volume by the author on Prolog programming and its applications written for Ventus. The most useful is requires, which takes another resource path, one of a resource name, an abstract path or an URI. If there is more than one required resource, pass them as a list. Use the ordered true option to enforce their being loaded in the list order.
The a number of algorithm is pretty dumb. On larger projects I usuallay set up a virtual resource for each item, that in turn requires the real file. This way, if I change versions of jQuery I only have to change it in one place. The other bit of magic we need is to declare that we need the resource. Include all needed material with resources. File extensions are a not very good, but universal way to indicate content type. With the mime type, can we add other types of resources?
Prolog - Logic Programming and Applications in AI - USOSWEB PW
There are a number of web resources you might need - perhaps your page needs some XML definition, or XSL fonts with the import mechanism, or maybe some compile after load script language. Whatever you need to send, you can do it with the resource manager.
Assume your make system generates an associated. Create a module that lets you require a coffeescript file. Extra credit: eliminate the blind dependence on the external build. Check for the absence of the js file or an older timestamp, and invoke the compiler as needed. If no one has done so first, publish your pack on swi-prolog.
An older, simpler scheme is basic or digest authentication, a part of the HTTP protocol. The newest way is through OpenID. Basic and digest authentication work more or less the same. Both look for an authentication header in the request. You might want to have different logins for different areas of the server - e.
Constraint Logic Programming (CLP)
Pro-tip - The realm value appears on the dialog. If you choose a name like Enter username and password for admin access you can somewhat improve the not great wording of the dialog box. Basic authentication is easy to implement.
- Learning the Korn Shell!
- CLP(B) — Boolean constraints?
- The Arab League (Global Organizations)?
- SWI-Prolog Portable.
- The Walnut Mansion;
- Consensus Design!
The basic authentication library takes a Unix style htpasswd file and lets you authenticate users against it. It also has a couple predicates to create a new passwd file and add names to it. Instead of answering the dialog, cancel it. SWI sends the status and the browser brings up the dialog.
- Table of Contents.
- About this book;
- Frontiers in Number Theory, Physics, and Geometry: On Conformal Field Theories, Discrete Groups and Renormalization.
- Macroeconomic Management in China: Proceedings of a Conference in Dalian, June 1993 (World Bank Discussion Paper)!
- From calculus to chaos: an introduction to dynamics.
- Routledge Handbook of Social and Cultural Theory (Routledge International Handbooks).
- An American Requiem: God, My Father, and the War That Came Between Us;
- Multi-Scale Modelling of Composite Material Systems: The Art of Predictive Damage Modelling (Woodhead Publishing in Materials).
- The ECLiPSe Constraint Programming System!
- Synthetic and Natural Phenols.
- Hollywood and the Box Office, 1895–1986.
- Duke Ellington: A Listeners Guide (Studies in Jazz);
After you correctly answer it becomes hard to fiddle with the example. This seems like more than we need to say as programmers. We really just need a password file and realm name. This being Prolog, of course the easier way is available. The biggest problem with basic authentication is that the credentials the user enters are transmitted in the clear. There is OpenID support. A client will be feeding your server data via long poll. Your site for aerospace engineers processes data sets on users behalf by some powerful but very cpu intensive computation that can take up to MB of stack but normal sized trail and global memory and run for hours.
The average site user will run one of these a day. The output is a large raw video file that is then transcoded into a standard video format. The transcoding is shelled out, but can take a long time minutes to complete. Note, there is no one right answer for this question. The simplest way to get your server onto port 80 to serve to the world is to have Apache reverse proxy.
Your web application will presumably need a persistent store on the back end. You have a number of options. As memory size has grown, the idea of simply keeping the database in memory has become feasible. The persistency library provides automatic backup to disk. Using the library is easy. Attaching the database file is also simple. Simply use the prolog persistency lib to snapshot your data. Even better, you can run your application in the same VM as part of ClioPatria, and have direct access to the rdf triples. This makes a very low impedence bump method of storing data.
The author has worked on a commercial development project using ClioPatria. ClioPatria is memory based, which is a limitation. A Datalog based DB. Datomic looks promising. Datalog is a subset of Prolog, so talking to it from prolog seems natural. However, you may find your life complicated if one http request is stopped in the debugger and the page never finishes loading because the browser is making another request. Most of the examples load this. Abstract path locations can be confusing. Literate programming. Hey, Java supports it. Gotta pick a high port number.
Steeped in tradition. Worked for a Chinese guy once who hired a feng-shui consultant to pick the number. Wish I could get that gig. The PLDoc server runs there, and may be running in the background. If you turn it on, change the default, and forget:. Phun 4 Hak3r Do0fs! That should make it easier to get in. So you query. Look cool, make yourself an admin page that shows server stats. Safe argument handling and you can handle the output from the process much easier.
Anyone who takes the course should be well equipped to contribute. The author wishes to thank Jan Wielemaker, L. Thanks to both projects. Thanks for taking this tutorial. If I can improve anything please email me at annie theelginworks. Up to All Tutorials. Introduction 1. Expected Results If you enter this course knowing SWI-Prolog well and have some experience with web development, you should be able to competently write production web applications afterwards.
Time hours if you do all the exercises. Why Prolog? Does Anybody Actually Use This? All these systems are in Prolog, using the web framework described in this tutorial. Especially, look at the source of the resulting page. Do the exercises.
Getting Stuck Many of the exercises in this tutorial were designed to push you to go explore the documentation. Setting Up Handlers 2. Hello Web Hello Web example. Exercise Run helloweb. Handlers SWI-Prolog web apps are defined as a collection of handlers. Exercise harder : serve up a small png image just using format calls.
Abstract Paths Abstract Path example. The first is an URI path, the second a file path. They now look like. Defining new abstract paths New Abstract Path example. The path to the root of files second arg is an absolute path specification, not root. I was tryig to make these abstract paths be abstract files paths for a long time when learning this stuff. Beware, the two have nothing to do with each other.
Moving the whole shebang Your server will some day probably be proxied to by apache, so your root path may be changed. Exercise Change the setting and confirm it works. You can also add your own paths. Say you have a file of videos you serve. Unlike URI locations, path aliases can be defined in terms of other aliases. Lets serve HTML. Part of the SWI-Prolog distribution. As an aside, if you like the whole WordPress style they write most of the application for me framework, check out Raivo Laanemets' Blog-Core. Combining Options Fortunately, this is a false dicotomy.
Entities entity escaping happens. Attributes This paragraph has a style and tooltip text. Nothing wrong with. For this reason, seriously consider using quasiquotes instead.
Quasiquotes largely deprecate this mechanism. The list brackets for including a literal are not optional! The second treats term as an inclusion. Quasiquotes Quasiquotes example. Start A Project At this point our exercises start building on each other. Styling Styling example. The arity 3 version saves us. Mailman Mailman Example.
Parameter example. Exercise: Create a landing page for the web form you made in inclusion and modules. File Upload File Upload example. Basic Session Usage Session example.
Related Prolog Programming and Applications
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