4tH is a Forth compiler with a little difference.
Instead of the standard Forth engine it features a
conventional compiler. 4tH is a very small
compiler that can create bytecode, C-embeddable
bytecode, standalone executables, but also works
fine as a scripting language. It supports about 95%
of the ANS Forth CORE wordset and features
conditional compilation, pipes, files, assertions,
forward declarations, enumerations, structures,
suspended execution, recursion, include files,
etc. It comes with an RPN calculator, line editor,
compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.
License: GNU Lesser General Public License (LGPL)
Changes:
A default 4tH directory can be defined by setting
an environment variable. Support for creating
custom 4tH implementations was added. The
multitasking environment is scriptable now. The
library files concerning ANS Core Extensions,
table searching, and interpretation have been
rewritten or replaced.
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