EXP(1.0)																  EXP(1.0)

EXP

       exp - a multiple expession calculator.

SYNOPSIS

       exp [-vn0..4] [-o output-file] [input-file]

DESCRIPTION

       Input  is  an ascii format file including numeric expessions with variables.  Input file can includes other input files thanks to an inclu-
       sion directive.	exp reads the input files to write it as is in the output file, but the numeric expessions are replaced by their value.

OPTIONS

       -v     verbose mode
	      0 : quiet mode
	      1 : messages mess(...) are printed
	      2 : few statistics
	      3 : all expressions are decomposed
	      4 : yacc messages

       -o output-file
	      where exp writes (stdout by default).

       input-file
	      where exp reads (stdin by default).

EXP FORMAT FILES

       Except the expessionsi and offline comments, the output file is identical to the flattened view of the input files whatever they are.   The
       expession forms can be either [expessions] or {expessions}.  The first form is for floating point expessions, the second one is for integer
       expessions. By default, the print format is respectively %7.3f and %4d (cf. sprintf(3)).  Offline comments begins with // and ends  at  the
       beginning of the next line.

       Examples

       o  [ 3.0 + 12.1] print 15.100

       o  { 3.0 + 12.1} print 15

       It  is  possible to have more that one expession separated by ; (semi-column). All the expessions of a list are computed, but only the last
       one is printed. If the last expession is empty, exp do not print anything (see Examples section).

       Examples

       o  [ 6. *2.0;
	    3.0 + 12.1 ] print 15.100

       o  [ 6. *2.0;
	    3.0 + 12.1; ] print nothing

       It is possible to have comments in expessions. A comment begins with # (diese) and ends to the carriage return.	Comment in  expression	is
       not copied to the output file.

       Example

       o  [ 3.0 + 12.1 # comment
	  ] print 15.100

   Expessions
       Expession is a multi-level numeric expession using numbers, variables, arithmetic operators and numeric functions.

       Examples

       o  [ i=3.0; i*12.1] print 15.100

       o  {i=3} print 3
	  {i++} print 4

   Arithmetic Operators
       The operators, in order of increasing priority, are

       + -    Addition and subtraction.

       * /    Multiplication and division.

       ++ --  post-incrementation of 1, post-decrementation of 1.

       ( )    Grouping

       =      Variable affectation. The return value is the one affected.

   Boolean Operators
       > <    respectively greater than and lower than

       def(variable)
	      True whenever variable is defined yet

       ndef(variable)
	      True whenever variable is not defined yet

   Variables
       Expession  values may be stored in simple variables.  There are three forms of variable name.  First, they can begin with a letter followed
       by any number of letters, digits and underscores; second, they can begin with " (double quote) followed by any number of any char and ended
       by a "; Third they can begin with ' (quote) then a regular expression (see regex(7)) ended by '.  exp is case sensitive.

       Examples

       o  [ VAR_1=3.0;		      # first form
	    "variable numero 2"=12.0; # second form
	  ] print nothing

       o  [ VAR_1 * "variable numero 2" ] print 15.100

       When a variable appears in the right member of an affectation, exp uses its value. If it has never been defined, this causes a fatal error.
       If it appears the left member, the first time it is automatically created and its value is set, or its value is changed.

   Special variables
       float_fmt, integer_fmt and string_fmt special variables to redefine print format of floats, integers and strings. Defaults are %7.3f,  %-8s
       and %4d. Those variables are the only variables with a non numerical value.

       Examples

       o  [float_fmt = "%7.1f";] print nothing

       o  [ 3.0 + 12.1] print 15.1

       verbose is the variable passed in argument list, which can be modified by the program itself.

       Examples  get details of expression calculation

       o  [tmp = verbose; verbose = 3; ..expressions..;
	  verbose = tmp;]

   Numeric functions
       Few  numeric  functions	are  available.  The  form  is fun(args).  The arguments take the form of a list of expessions, separated with a ,
       (comma). The number of arguments depends on functions.  It is possible to make a list of arguments with a regular expession (see regex(7)).
       Then all matching variable names are part of the list.

       min(args) max(args)
	      The minimum (resp. maximum) value of its arguments.

	      Examples

	      o  [min(3.0,12.1)] print 3.000

	      o  [min('RW_ALU.*')] print min value of all variables begining by RW_ALU

       inf(step,val) sup(step,val)
	      Two  arguments.  inf  (resp.  sup)  function rounds the second argument (val) downwards (resp.  upwards) to an integer number of the
	      first argument (step).

	      Examples

	      o  [step=0.3;value=1.6;inf(step,value)] print 1.500

   Special functions and directives
       if(condition, expr1, expr2, ...)
	      Calculates the condition if it is true (means greater than zero), the following expressions are all calculated.

       sort(args) rsort(args)
	      sort (resp. reverse rsort) numerically all its arguments, each argument must be a variable, not directly a  numeric  expession.  The
	      return value is the sorted list of its arguments.

       message(args)
	      writes  its  arguments  to stdout using float_fmt, one argument per line.  The form is : variable_name = value;, value is omitted if
	      the variable has never been defined.
	      Examples

	      o  [message('"'this is a message'"');] print
		 this is a message

	      o  [a1b=0; a2b=1O; a3b=5; message(a*b);] print
		 a1b	  =  0.000
		 a2b	  = 1O.000
		 a3b	  =  5.000

	      o  [string_fmt=%6s; message(sort(a*b));] print
		    a1b =  0.000
		    a3b =  5.000
		    a2b = 1O.000

       #include "filename"
	      Opens the file in argument then returns to the current file as soon as the new one is empty.

EXAMPLES

       Input file
	      # this is a test file
	      [ # few variables
		WITDH = 2;
		LENGTH = 25 ;
	      ]
	      this message is unchanged but all expresions are computed
		length_div_2 = [LENGTH/2]
		length_mul_2 = {LENGTH*2}
		result = [max ('leng.*')]

       Output file
	      # this is a test file

	      this message is unchanged but all expresions are computed
		length_div_2 =	 12.500
		length_mul_2 =	 50
		result =   12.500

AUTHOR

       Written by Franck Wajsburt.

SEE ALSO

       Alliance .rds file uses exp to be generated.

UPMC
/ASIM/LIP6							  March 18, 2002							  EXP(1.0)