ireb 4.1 download

Name: ireb 4.1 download
Category: Downloads
Published: bartrocarcorn1970
Language: English

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table of Contents.
1 Using SWI-Prolog.
1.1 Starting Prolog and loading a program.
The SWI-Prolog executable swipl-win.exe can be started from the StartMenu or by opening a .pl file holding Prolog program text from the Windows explorer. 1 The .PL file extension can be changed during installation. See section 3.2. The installation folder (by default C:\Program Files\swipl ) contains a subfolder demo with the file likes.pl . This file can be opened in Prolog from the StartMenu, by opening likes.pl in the Windows explorer or by using the following command in the Prolog application. Be sure to get the quotes right and terminate the command with a full-stop ( . ).
If Prolog is started from the start menu it is passed the option --win_app , which causes it to start in the local equivalent of MyDocuments\Prolog . This folder is created if it does not exist.
1.2 Executing a query.
After loading a program, one can ask Prolog queries about the program. The query below asks Prolog what food `sam' likes. The system responds with X = value > if it can prove the goal for a certain X . The user can type the semi-colon (;) 2 On most installations, single-character commands are executed without waiting for the RETURN key. if (s)he wants another solution, or RETURN if (s)he is satisfied, after which Prolog will say Yes . If Prolog answers No , it indicates it cannot find any (more) answers to the query. Finally, Prolog can answer using an error message to indicate that the query or program contains an error.
1.3 Menu commands.
The SWI-Prolog console prov > File/Reload modified files This menu reloads all loaded source files that have been modified using the make/0 command described in section 1.5. File/Navigator . Opens an explorer-like view on Prolog files and the predicates they contain. Settings/Font . Allows for changing the font of the console. On some installations the default font gives redraw and cursor dislocation problems. In this case you may wish to select an alternative. Some built-in commands assume non-proportional fonts. Settings/User init file . Edits the user personalisation file. If no such file exists, it first installs a default file as pl.ini that contains commonly used settings in comments. Settings/Stack sizes . Allows for defining the maximum size to which the various Prolog stacks are allowed to grow. The system defaults are chosen to make erroneous programs fail quickly on modest hardware. Programs with large data structures or many choice-points often need larger stacks. Note that an active Prolog process growing over the size of the physical memory of your computer can make the system extremely slow. Run/Interrupt Try to interrupt the running Prolog process. This is the same as using Control-C . Sometimes interrupts are not honoured or take very long to process. Closing the window twice provides a way to force Prolog to stop. Run/New thread Creates a new interactor window running in a separate thread of execution. This may be used to inspect the database or program while the main task continues. Debug/Edit spy points . Edit break-points on predicates. From the PceEmacs editor (see section 1.4) break-points can also be set on specific calls from specific clauses. Debug/Graphical debugger . Use the source-level debugger on the next spy- or break-point or other call that enables the debugger. Help The help menu provides various starting points to related documents. Items flagged with (on www) open your default internet browser on a page of the SWI-Prolog website.
1.4 Editing Prolog programs.
There are three options for editing. One is to run an editor of choice in a separate window and use the make/0 command described below to reload modified files. In addition to this option Prolog can be used to locate predicates, modules and loaded files by specifying the editor of choice for use with the edit/1 command, described below. This is achieved by editing the personalisation file (see section 1.3) and following the instructions in the comments.
The default editor is built-in editor called PceEmacs . This editor provides colourisation support based on real-time parsing and cross-reference analysis of the program.
Other options for editing include GNU-Emacs, SWI-Prolog-Editor and the Eclipse-based PDT environment. See http://www.swi-prolog.org/ >1.5 Some useful commands.
This section prov > consult ( :File ) Load a source file. On Windows, folders may be specified with the DOS/Windows \ , which must be escaped, or by using the POSIX standard / . Especially when used in source code, / is to be preferred as it is portable. A Prolog list ([ . ]) can be used to abbreviate the consult command. The file extension ( .pl as well as the selected alternative) can be omitted. Here are some examples:
?- consult(likes). Load likes.pl from the current folder (see pwd/0). ?- ['C:/Program Files/pl/demo/likes'] Load likes.pl using absolute path. ?- ['C: \ \ Program Files \ \ pl \ \ demo \ \ likes'] Same using Windows-style path name pwd Print working directory (folder). ls List files in current directory. edit If Prolog is started by opening a .pl file in the explorer, edit this file. Also available from the menu. edit ( +Spec ) Edit file, predicate, module, etc., with the given name. If multiple items are named Spec it prompts for the desired alternative. make Reload all files that have been changed since they were last loaded. Normally used after editing one or more files. gtrace Start the graphical debugger. There are three ways to use this. Entered as a single goal at the top-level, the next query will be traced. Alternatively it can be used in conjunction with the goal to be debugged: ?- gtrace, run. and finally you can include it in your program to start tracing at a particular point or under a particular condition: trace Same as gtrace, but text-based on the console. apropos ( +Keyword ) Search for all predicates that contain Keyword in their name or short description. If a GUI environment is available the results are hyperlinks. Otherwise use help/1 to get details on selected hits. help ( +Spec ) Give help on Spec , which is normally the name of a predicate or C interface function.
2 Using SWI-Prolog with C/C++
Using MinGW or a compiler with a compatible calling format you can write C or C++ code that can be loaded into SWI-Prolog and called as a predicate. You can also embed SWI-Prolog in C/C++ applications.
Details on how to interact with Prolog are in the SWI-Prolog reference manual. The mailing list archives and TWiki web provide problems and solutions to the many problems that may occur. Documentation of the SWI-cpp.h C++ include file is available from the package documentation. This section only discusses some Windows-specific issues.
2.1 Using MSVC.
Because the current versions of SWI-Prolog are compiled and linked with MinGW, we are unsure about the status with regard to compiling extensions using MSVC and embedding SWI-Prolog into MSVC projects.
Please send your comments to the SWI-Prolog mailinglist, and/or mailto:[email protected].
First of all, add the include folder of the installation to the search path for headers and the lib folder to the search path for libraries. Both DLLs (extensions) or embedded executables should link to libswipl.dll.a and, if appropriate, to the multi-threaded DLL version of the MSVC runtime library.
To create extensions, create a Win32 DLL. To embed Prolog, care should be taken that Prolog can find the Prolog installation. For development , the simplest way to ensure this is by adding the installation bin folder to the %PATH% environment and calling PL_initialise() as illustrated below. PL_initialise() uses the path of the loaded libswipl.dll module to find the Prolog installation folder. 3 When using the C++ interface from SWI-cpp.h , these comments apply to the arguments for PlEngine().
To create an executable that does not rely on Prolog one must create a saved state of the required Prolog code and attach this to the executable. Creating saved states is described with qsave_program/2 in the reference manual. This can be attached to a state using the DOS command below to create final.exe from the executable produced by MSVC and the generated saved state.
2.2 Using swipl-ld.exe.
The swipl-ld.exe automates most of the above complications and provides compatibility for common tasks on many platforms supported by SWI-Prolog. To use it with MinGW, set the PATH environment variables to include the SWI-Prolog binary folder as well as the MinGW binary folders (typically C:\MinGW\bin ) to find gcc . An extension myext.dll can be created from the source myext.c using the command below. Add -v to see what commands are executed by swipl-ld.exe .
An embedded executable is created from C, C++ and Prolog files using.
3 The installation.
3.1 Supported Windows versions.
By default, Prolog uses the .pl extension to indicate Prolog source files. Unfortunately this extension conflicts with the Perl language. If you want to use both on the same Windows machine SWI-Prolog allows you to choose a different extension during the installation. The extension .pro is a commonly used alternative. If portability is an issue, it is advised to use the alternative extension only for the load file , the source file that loads the entire program, and use the normal .pl extension for libraries and files loaded from other files.
3.3 Installed programs.
The table below lists the installed components. Some components are marked (32-bits) or (64-bits). Most of this is because the 64-bits version is built using more recent tools and from more recent versions of required libraries using different naming conventions. This will probably be synchronised in the future.
Programs bin\swipl-win.exe Default Windows application for interactive use. bin\swipl.exe Console-based version for scripting purposes. Utilities bin\swipl-ld.exe Linker front-end to make single-file mixed Prolog/C/C++ executables. bin\plrc.exe Manipulate Prolog resource files. Important directories bin Executables and DLL files library Prolog library boot Sources for system predicates include C/C++ header files for embedding or to create extensions xpce XPCE graphics system xpce\prolog\lib XPCE/Prolog library DLLs and other supporting files boot32.prc Initial Prolog state (32-bits) boot64.prc Initial Prolog state (64-bits) \bin\libswipl.dll The Prolog kernel \bin\plterm.dll The window for swipl-win.exe \bin\pthreadVC2.dll POSIX thread runtime library (64-bits) Extension DLLs (plugins) \bin\cgi.dll Gather CGI GET and POST arguments \bin\double_metaphone.dll Soundex (sounds similar) \bin\memfile.dll In-memory temporary `files' \bin\odbc4pl.dll ODBC interface \bin\plregtry.dll Windows registry interface \bin\porter_stem.dll Porter stemming implementation \bin\random.dll Portable random number generator \bin\rdf_db.dll RDF database \bin\readutil.dll Fast reading utility \bin\sgml2pl.dll SGML/XML parser \bin\socket.dll Prolog socket interface \bin\table.dll Access structured files as tables \bin\time.dll Timing and alarm library \bin\xpce2pl.dll The XPCE graphics system \bin\zlib1.dll Compression library (32-bit) \bin\zlibwapi.dll Compression library (64-bit) \bin\zlib4pl.dll Compression library interface.
3.4 Installed Registry keys and menus.
The filetype .pl or chosen alternative (see section 3.2) is associated to swipl-win.exe . A chosen folder (default SWI-Prolog) is added to the start menu holding shortcuts to Prolog and some related utilities. The following registry keys are in use. The 64-bit version uses Prolog64 instead of Prolog as a key to accommodate installation of both versions on the same machine. Note that opening a .pl file can be associated with one of the installed Prolog versions only.
HKEY_LOCAL_MACHINE \ Software \ SWI \ Prolog fileExtension Extension used for Prolog files group Start menu group home Installation directory HKEY_CURRENT_USER \ Software \ SWI \ Plwin \ Console Note: thread-windows store the same info in sub-keys Height Height of window in character units Width Width of window in character units X Left edge of window in pixel units Y Top edge of window in pixel units SaveLines Number of lines available for scrollback.
3.5 Execution level.
The installer asks for the admin execution level (Vista and later) to be able to write shortcuts and registry keys.
3.6 Creating a desktop menu item.
If you want a desktop entry for SWI-Prolog, right-drag swipl-win.exe to the desktop and select `Create shortcut'. Then edit the properties and add --win_app to the commandline to make the application start in MyDocuments\Prolog .
4 The SWI-Prolog community and foundation.
4.1 Web-site and mailing lists.
The SWI-Prolog website is located at http://www.swi-prolog.org/.
4.2 About license conditions.
The SWI-Prolog license allows it to be used in a wide variety of environments, including closed-source commercial applications. In practice, redistribution and embedding is allowed, as long as modifications to the SWI-Prolog source are published following the Free Software rules.
The SWI-Prolog kernel and foreign libraries are licensed under the Lesser General Public License (LGPL). The Prolog files are licensed under the normal General Public License GPL with an additional statement that allows for embedding in proprietary software:
As a special exception, if you link this library with other files, compiled with a Free Software compiler, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not, however, invalidate any other reasons why the executable file might be covered by the GNU General Public License.
This exception is a proven construct used for libgcc , the GNU C-compiler runtime library.
4.3 Supporting SWI-Prolog.
There are several ways to support SWI-Prolog:
Extend the system with contributions. Improve the system by submitting bug reports and patches. Link to http://www.swi-prolog.org and refer to SWI-Prolog in publications. For commercial users, it may be profitable to sponsor development projects that make SWI-Prolog more useful for you and others. Example projects from the part include adding the initial garbage collector, unbounded integer support, SSL interface, (re-)introduction of the stack-shifter, avoid C-recursion on Prolog datastructures, the PlUnit test environment and the PlDoc documentation environment.
Sponsoring development has several benefits: (1) it solves your bottlenecks, (2) others help debugging it and (3) it strengthens SWI-Prolog's position, which gives you better guarantees that the system remains actively developed and makes it easier to find resources and programmers.

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