ratfor(1) General Commands Manual ratfor(1)

ratfor - ratfor preprocessor for fortran77

ratfor [-l n] [-C] [-o output] [-s type] input

user sets starting label n
specify output file, otherwise it is stdout
keep comments in (useful for compiler directives)
specify element type of array used for strings, by default integer

Ratfor has the following syntax:

prog:   stat
        prog stat
stat:   if (...) stat
        if (...) stat else stat
        while (...) stat
        repeat stat
        repeat stat until (...)
        for (...;...;...) stat
        do ... stat
        switch (intexpr) { case val[,val]: stmt ... default: stmt }
        break n
        next n
        return (...)
        digits stat
        { prog }  or  [ prog ]  or  $( prog $)
        anything unrecognizable

where stat is any Fortran or Ratfor statement, and intexpr is an expression that resolves into an integer value. A statement is terminated by an end-of-line or a semicolon. The following translations are also performed.

        <       .lt.    <=      .le.
        ==      .eq.
        !=      .ne.    ^=      .ne.    ~=      .ne.
        >=      .ge.    >       .gt.
        |       .or.    &       .and.
        !       .not.   ^       .not.   ~       .not.

Integer constants in bases other that decimal may be specified as n%dddd... where n is a decimal number indicating the base and dddd... are digits in that base. For bases > 10, letters are used for digits above 9. Examples: 8%77, 16%2ff, 2%0010011. The number is converted the equivalent decimal value using multiplication; this may cause sign problems if the number has too many digits.

String literals ("..." or '...') can be continued across line boundaries by ending the line to be continued with an underline. The underline is not included as part of the literal. Leading blanks and tabs on the next line are ignored; this facilitates consistent indentation.


include file

will include the named file in the input.


define (name,value) or
define name value

defines name as a symbolic parameter with the indicated value. Names of symbolic parameters may contain letters, digits, periods, and underline character but must begin with a letter (e.g. B.FLAG). Upper case is not equivalent to lower case in parameter names.


string name "character string" or
string name(size) "character string"

defines name to be an integer array long enough to accomodate the ascii codes for the given character string, one per word. The last word of name is initialized to the symbolic parameter EOS, and indicates the end of string.

The program must ensure that EOS is defined before using the string directive.

The string directive produces an array declaration followed by a data statement. A series of string directives (separated by optional semicolons and newlines only) will produce all their data statements at the end of the series. If you are using an old Fortran compiler that does not tolerate intermixture of declarations and other statements, then your string directives must be carefully arranged at the end of the rest of your other declarations to avoid violating this constraint.

IMPLICIT UNDEFINED and IMPLICIT NONE directives are incompatible with the Ratfor switch statement. This is because the Ratfor switch statement produces a new integer variable to contain the value of the switched-upon expression.

ratfor, fortran, preprocessor, fortran77, ratfor77, spp

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