02nov17abu
(c) Software Lab. Alexander Burger
Perfection is attained
not when there is nothing left to add
but when there is nothing left to take away
(Antoine de Saint-Exupery)
The PicoLisp System
===================
_PI_co Lisp is not _CO_mmon Lisp
PicoLisp can be viewed from two different aspects: As a general purpose
programming language, and a dedicated application server framework.
(1) As a programming language, PicoLisp provides a 1-to-1 mapping of a clean
and powerful Lisp derivate, to a simple and efficient virtual machine. It
supports persistent objects as a first class data type, resulting in a database
system of Entity/Relation classes and a Prolog-like query language tightly
integrated into the system.
The virtual machine was designed to be
Simple
The internal data structure should be as simple as possible. Only one
single data structure is used to build all higher level constructs.
Unlimited
There are no limits imposed upon the language due to limitations of the
virtual machine architecture. That is, there is no upper bound in symbol
name length, number digit counts, or data structure and buffer sizes,
except for the total memory size of the host machine.
Dynamic
Behavior should be as dynamic as possible ("run"-time vs. "compile"-time).
All decisions are delayed till runtime where possible. This involves
matters like memory management, dynamic symbol binding, and late method
binding.
Practical
PicoLisp is not just a toy of theoretical value. PicoLisp is used since
1988 in actual application development, research and production.
The language inherits the major advantages of classical Lisp systems like
- Dynamic data types and structures
- Formal equivalence of code and data
- Functional programming style
- An interactive environment
PicoLisp is very different from any other Lisp dialect. This is partly due to
the above design principles, and partly due to its long development history
since 1984.
You can download the latest release version at http://software-lab.de/down.html
(2) As an application server framework, PicoLisp provides for
NoSQL Database Management
Index trees
Object local indexes
Entity/Relation classes
Pilog (PicoLisp Prolog) queries
Multi-user synchronization
DB Garbage collection
Journaling, Replication
User Interface
Browser GUI
(X)HTML/CSS
XMLHttpRequest/JavaScript
Application Server
Process management
Process family communication
XML I/O
Import/export
User administration
Internationalization
Security
Object linkage
Postscript/Printing
PicoLisp is not an IDE. All program development in Software Lab. is done using
the console, bash, vim and the Lisp interpreter.
The only type of GUI supported for applications is through a browser via HTML.
This makes the client side completely platform independent. The GUI is created
dynamically. Though it uses JavaScript and XMLHttpRequest for speed
improvements, it is fully functional also without JavaScript or CSS.
The GUI is deeply integrated with - and generated dynamically from - the
application's data model. Because the application logic runs on the server,
multiple users can view and modify the same database object without conflicts,
everyone seeing changes done by other users on her screen immediately due to the
internal process and database synchronization.
PicoLisp is free software, and you are welcome to use and redistribute it under
the conditions of the MIT/X11 License (see "COPYING").
It compiles and runs on current 32-bit GNU/Linux, FreeBSD, NetBSD, OpenBSD,
SunOS (illumos), HP-UX, AIX, IRIX64, Cygwin/Win32 (and possibly other) systems.
A native 64-bit version is available for arm64/Linux, x86-64/Linux, ppc64/Linux,
x86-64/FreeBSD, x86-64/OpenBSD and x86-64/SunOS (illumos).
--------------------------------------------------------------------------------
Alexander Burger
Software Lab. / 7fach GmbH
Bahnhofstr. 24a, D-86462 Langweid
abu@software-lab.de, http://www.software-lab.de, +49 8230 5060