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PREPROCESS(1) General Commands Manual PREPROCESS(1) NAME
preprocess - Preprocess a file. SYNOPSIS
preprocess [options...] infile DESCRIPTION
Preprocess is like a typical C preprocessor, but it extends to multiple languages. Languages for which it works include: C++, Python, Perl, Tcl, XML, JavaScript, CSS, IDL, TeX, Fortran, PHP, Java, Shell scripts (Bash, CSH, etc.) and C#. Preprocess is usable both as a command line app and as a Python module. OPTIONS
-h, --help Print help text and exit. -V, --version Print the version info and exit. -v, --verbose Give verbose output for errors. -o outfile Write output to the given file instead of to stdout. -f, --force Overwrite given output file. Otherwise an IOError will be raised if outfile already exists. -D define Define a variable for preprocessing. define can simply be a variable name (in which case it will be true) or it can be of the form var=val. An attempt will be made to convert val to an integer so "-D FOO=0" will create a false value. -I dir Add a directory to the include path for #include directives. -k, --keep-lines Emit empty lines for preprocessor statement lines and skipped output lines. This allows line numbers to stay constant. -s, --substitute Substitute defines into emitted lines. By default substitution is NOT done because it currently will substitute into program strings. MODULE USAGE
from preprocess import preprocess preprocess(infile, outfile=sys.stdout, defines={}, force=0, keepLines=0, includePath=[], substitute=0) The <infile> can be marked up with special preprocessor statement lines of the form: <comment-prefix> <preprocessor-statement> <comment-suffix> where the <comment-prefix/suffix> are the native comment delimiters for that file type. EXAMPLES
HTML (*.htm, *.html) or XML (*.xml, *.kpf, *.xul) files: <!-- #if FOO --> ... <!-- #endif --> Python (*.py), Perl (*.pl), Tcl (*.tcl), Ruby (*.rb), Bash (*.sh), or make ([Mm]akefile*) files: # #if defined('FAV_COLOR') and FAV_COLOR == "blue" ... # #elif FAV_COLOR == "red" ... # #else ... # #endif C (*.c, *.h), C++ (*.cpp, *.cxx, *.cc, *.h, *.hpp, *.hxx, *.hh), Java (*.java), PHP (*.php) or C# (*.cs) files: // #define FAV_COLOR 'blue' ... /* #ifndef FAV_COLOR */ ... // #endif Fortran 77 (*.f) or 90/95 (*.f90) files: C #if COEFF == 'var' ... C #endif PREPROCESSOR SYNTAX
Valid statements: #define <var> [<value>] #undef <var> #ifdef <var> #ifndef <var> #if <expr> #elif <expr> #else #endif #error <error string> #include "<file>" where <expr> is any valid Python expression. The expression after #if/elif may be a Python statement. It is an error to refer to a variable that has not been defined by a -D option or by an in-content #define. Special built-in methods for expressions: defined(varName) Return true if given variable is defined. TIPS
A suggested file naming convention is to let input files to preprocess be of the form <basename>.p.<ext> and direct the output of prepro- cess to <basename>.<ext>, e.g.: preprocess -o foo.py foo.p.py The advantage is that other tools (esp. editors) will still recognize the unpreprocessed file as the original language. AUTHORS
Trent Mick <trentm@gmail.com> This manual page was written by Johannes Ring <johannr@simula.no> for the Debian GNU/Linux system (but may be used by others). PREPROCESS(1)
