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Command line interface

fsource includes a command line tool fsource, which allows analyzing Fortran files.

$ fsource COMMAND [OPTIONS] FILE.f90 ...

The following values are allowed for COMMAND:

  1. splice: reads a Fortran file and turns it into a sequence of logical lines and classifying the lines. See splicer.

  2. lex: reads a Fortran file and turns it into a sequence of tokens, which are the smallest units of text understood by the parser. See lexer.

  3. parse: reads a Fortran file, splices and lexes it, then matches the tokens against the grammatical rules of Fortran, generating a hierarchical structure of items called an abstract syntax tree (AST). See parser.

  4. wrap: reads a Fortran file, creates an abstract syntax tree. Then generate a C header file from Fortran declarations that use BIND(C). See wrapper.

Fortran source form

Fortran source files come in two variants: fixed form, which is the older punchcard-inspired format, and free form, the more modern format introduced with Fortran 90.

By default, fsource will try to guess free or fixed form files from the file name extension, but you may override this by specifying a command line flag. The following table summarizes the behaviour:

source file flag extensions
fixed form --fixed-form .f, .f77, .for
free form --free-form .f90, .f95, .f03, .f08