The following special tokens may be used in the text of Fweb macro definitions:
## --- Paste tokens on either side to form a new identifier. #parameter --- Convert parameter to string (without expansion).
For example,
@m FORTRAN(type, name) type _##name() @m TRACE(where) puts("At " #where) @a FORTRAN(int, fcalc); // Expands to ‘int _fcalc();’ TRACE(predictor); // Expands to ‘puts("At " "predictor");’
The most frequently used extensions are the following ones associated with variable arguments: ‘#0’, ‘#n’, and ‘#.’. Fortran-77 users should also employ ‘#:0’ to allow symbolic rather than numeric statement labels. Try not to use the other extensions; they are experimental, complicated, and unlikely to work in all situations.
In the following list, the forms ‘#{n}’ and ‘#[n]’ may not work correctly in complicated situations. This is a design deficiency that may be corrected someday.
#*
param- Like ‘#parameter’, but pass a quoted string through unchanged.
#!
param- Don't expand argument.
#'
param- Convert parameter to a single-quoted string (no expansion).
#"
param- Convert parameter to a double-quoted string (no expansion).
#0
- Number of variable arguments.
#
n- n-th variable argument, counting from 1.
#{0}
- Like ‘#0’, but the argument may be a macro expression known at run time.
#{
n}
- Like ‘#n’, but the argument may be a macro expression.
#[0]
- The total number of arguments (fixed + variable). (The argument inside the brackets may be a macro expression.)
#[
n]
- The nth argument (including the fixed ones), counting from 1. (The argument inside the brackets may be a macro expressions.
#.
- Comma-separated list of all variable arguments.
#:0
- Unique statement number (expanded in phase 1).
#:
nnn- Unique statement number for each invocation of this macro (expanded in phase 2).
#<
- Begin a module name.
#,
- Internal comma; doesn't delimit macro argument.
A few examples of the more important of these tokens are as follows:
@c
@m FPRINTF(fmt,...) fprintf(fp,fmt,#.)
// Use the whole list of variable args.
@m B(...) printf("There were %i arguments\n", #0)
// Use the number of var args.
@n
@
@m DONE #:0 // Symbolic statement label in Fortran.
@a
goto DONE
...
DONE:
call endup