ThomasMertes / seed7

Welcome to the world of Seed7 The Seed7 Homepage is at https://seed7.net/index.htm Seed7 is a high level general purpose programming language. The Seed7 project is open-source. There is an interpreter and a compiler. The compiler translates Seed7 programs to C programs which are subsequently compiled to machine code. Features of Seed7 • As an extensible programming language it supports user defined statements and operators. • The whole language is not hard-coded in the compiler but defined via include-libraries (syntactically and semantically). • Types are first class objects (Templates and generics can be defined easily without special syntax). • All Seed7 functions can be executed at compile-time or at run-time. • Object orientation supports interfaces and multiple dispatch. • Static type checking and the absence of automatic casts help to find errors at compile-time. • There is an automatic memory management that works without a garbage collection process. • Seed7 is operating system and architecture independent. • Seed7 programs are source code portable without any need to change the code. • Exception handling is supported (e.g. an integer overflow raises OVERFLOW_ERROR). • Source code debugging is supported. • The types bigInteger and bigRational support numbers of unlimited size. • Functions, operators and statements can be overloaded. • There are various predefined types like array, hash, set, struct, color, time, duration, etc. • Seed7 runs under Linux, MacOS, various Unix versions and Windows. • Interpreter, compiler and the example programs use the GPL license, while the runtime library uses the LGPL license. Standard libraries of Seed7 • The libraries provide the same functionality under all supported operating systems. • Numerous standard libraries allow writing programs without calling functions from third party libraries. • There is a database independent API, which can connect to MySQL, MariaDB, SQLLite, PostgreSQL, Oracle, ODBC, Firebird, Interbase, Db2, Informix and SQL Server databases. • There is a 2-D graphic library which uses X11 under Linux, GDI under Windows and JavaScript in the Browser. • Parser and interpreter are part of the run-time library. What is contained in this package The Seed7 package contains the Seed7 interpreter in source besides documentation files, include files and program examples. The following sub directories exist: • src The source of the interpreter • prg Program examples • lib Include / library files • doc Documentation files • bin Executables and runtime libraries Using the extension several files can be distinguished: • \*.txt Documentation files • \*.sd7 Program example files • \*.s7i Include / library files • \*.dna Include file for the dna program • \*.c C source file • \*.h C include file How to compile the interpreter For Linux this is quite simple (to compile under other operating systems see seed7/src/read\_me.txt). The makefile is prepared for Linux. First make sure that gcc, make and the development packages for X11 and ncurses are installed. Then go to the seed7/src directory and type: make depend make After the compilation the interpreter is linked to the file seed7/prg/s7. The Seed7 compiler (s7c) is compiled with: make s7c The compiler executable is copied to the bin directory. To check interpreter and compiler with a test suite (chk\_all.sd7) use the command: make test Finally Seed7 can be installed with: sudo make install To do several compilation attempts in succession you need to execute the command make clean before you do again. The file seed7/src/read\_me.txt contains a detailed explanation of the compilation process. How to compile under other operating systems Seed7 supports several operating systems such as Windows, Mac OS X and various Unix variants. How to compile under these operating systems is explained in the file seed7/src/read\_me.txt. How to execute a program After compiling the interpreter you can make the first test. Switch to the seed7/prg directory and type: ./s7 hello This executes the hello world program which is in the hello.sd7 file. Every file with the .sd7 extension can be executed with the s7 interpreter. A list of the program files with a short description can be found in the file: prg/files.txt. What to do when there are problems with the compilation The file seed7/src/read\_me.txt discusses the compilation process with more detail. How to send a patch Just send a pull request to the GitHub repository of Seed7. Participation is always welcome. If you send a pull request, it is assumed that your change is released under the GPL (or LGPL for libraries) license. Greetings Thomas Mertes