aradi / Fypp
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Fypp — Python powered Fortran metaprogramming
.. image:: https://travis-ci.org/aradi/fypp.svg?branch=develop :target: https://travis-ci.org/aradi/fypp
Fypp is a Python powered preprocessor. It can be used for any programming languages but its primary aim is to offer a Fortran preprocessor, which helps to extend Fortran with condititional compiling and template metaprogramming capabilities. Instead of introducing its own expression syntax, it uses Python expressions in its preprocessor directives, offering the consistency and versatility of Python when formulating metaprogramming tasks. It puts strong emphasis on robustness and on neat integration into developing toolchains.
The project is hosted on github <https://github.com/aradi/fypp>
_.
Detailed DOCUMENTATION <http://fypp.readthedocs.org>
_ is available on
readthedocs.org <http://fypp.readthedocs.org>
_.
Fypp is released under the BSD 2-clause license.
Main features
-
Definition, evaluation and removal of variables::
#:if DEBUG > 0 print *, "Some debug information" #:endif
#:set LOGLEVEL = 2 print *, "LOGLEVEL: ${LOGLEVEL}$"
#:del LOGLEVEL
-
Macro definitions and macro calls::
#:def ASSERT(cond) #:if DEBUG > 0 if (.not. ${cond}$) then print *, "Assert failed in file ${FILE}$, line ${LINE}$" error stop end if #:endif #:enddef ASSERT
! Invoked via direct call (argument needs no quotation) @:ASSERT(size(myArray) > 0)
! Invoked as Python expression (argument needs quotation) $:ASSERT('size(myArray) > 0')
-
Conditional output::
program test #:if defined('WITH_MPI') use mpi #:elif defined('WITH_OPENMP') use openmp #:else use serial #:endif
-
Iterated output (e.g. for generating Fortran templates)::
interface myfunc #:for dtype in ['real', 'dreal', 'complex', 'dcomplex'] module procedure myfunc_${dtype}$ #:endfor end interface myfunc
-
Inline directives::
logical, parameter :: hasMpi = #{if defined('MPI')}# .true. #{else}# .false. #{endif}#
-
Insertion of arbitrary Python expressions::
character(*), parameter :: comp_date = "${time.strftime('%Y-%m-%d')}$"
-
Inclusion of files during preprocessing::
#:include "macrodefs.fypp"
-
Using Fortran-style continutation lines in preprocessor directives::
#:if var1 > var2 & & or var2 > var4 print *, "Doing something here" #:endif
-
Passing (unquoted) multiline string arguments to callables::
#! Callable needs only string argument #:def DEBUG_CODE(code) #:if DEBUG > 0 $:code #:endif #:enddef DEBUG_CODE
#! Pass code block as first positional argument #:block DEBUG_CODE if (size(array) > 100) then print *, "DEBUG: spuriously large array" end if #:endblock DEBUG_CODE
#! Callable needs also non-string argument types #:def REPEAT_CODE(code, repeat) #:for ind in range(repeat) $:code #:endfor #:enddef REPEAT_CODE
#! Pass code block as positional argument and 3 as keyword argument "repeat" #:block REPEAT_CODE(repeat=3) this will be repeated 3 times #:endblock REPEAT_CODE
-
Preprocessor comments::
#! This will not show up in the output #! Also the newline characters at the end of the lines will be suppressed
-
Suppressing the preprocessor output in selected regions::
#! Definitions are read, but no output (e.g. newlines) will be produced #:mute #:include "macrodefs.fypp" #:endmute
-
Explicit request for stopping the preprocessor::
#:if DEBUGLEVEL < 0 #:stop 'Negative debug level not allowed!' #:endif
-
Easy check for macro parameter sanity::
#:def mymacro(RANK) #! Macro only works for RANK 1 and above #:assert RANK > 0 : #:enddef mymacro
-
Line numbering directives in output::
program test #:if defined('MPI') use mpi #:endif :
transformed to ::
program test
use mpi
:
when variable
MPI
is defined and Fypp was instructed to generate line markers. -
Automatic folding of generated lines exceeding line length limit
Installing
Fypp needs a working Python interpreter. It is compatible with Python 2 (version 2.6 and above) and Python 3 (all versions).
Automatic install
Use Pythons command line installer pip
in order to download the stable
release from the Fypp page on PyPI <http://pypi.python.org/pypi/fypp>
_ and
install it on your system::
pip install fypp
This installs both, the command line tool fypp
and the Python module
fypp.py
. Latter you can import if you want to access the functionality of
Fypp directly from within your Python scripts.
Manual install
For a manual install, you can download the source code of the stable
releases from the Fypp project website <https://github.com/aradi/fypp/releases>
_.
If you wish to obtain the latest development version, clone the projects repository::
git clone https://github.com/aradi/fypp.git
and check out the master
branch.
The command line tool is a single stand-alone script. You can run it directly from the source folder ::
FYPP_SOURCE_FOLDER/bin/fypp
or after copying it from the bin
folder to any location listed in your PATH
environment variable, by just issuing ::
fypp
The python module fypp.py
can be found in FYP_SOURCE_FOLDER/src
.
Running
The Fypp command line tool reads a file, preprocesses it and writes it to another file, so you would typically invoke it like::
fypp source.fpp source.f90
which would process source.fpp
and write the result to source.f90
. If
input and output files are not specified, information is read from stdin and
written to stdout.
The behavior of Fypp can be influenced with various command line options. A summary of all command line options can be obtained by::
fypp -h