part of shnell – a source to source compiler enhancement tool

© Jens Gustedt, 2019

A directive to repeat code snippets

Usage:

#pragma CMOD amend do NAME[:INDEX] [=] [START] END [OPERATION]

This repeats the depending code a number of times where it binds the variable ${NAME} to specific values as computed by seq.sh. OPERATION can be any of +, -, * or / followed by a number. If OPERATION is omitted it is +1, if the operator is submitted it defaults to +. If START is also omitted it is 0.

The produced sequence of numbers is checked against END with < if the sequences increases (that is for + and *) and with > if it decreases (that is for - and /).

If additionally prefixed with a # as in #${NAME}, the resulting value is put inside a C string literal. See regVar for more on how tokens can be manipulated and separated for this replacement procedure.

As for foreach an optional INDEX meta-variable may also be used to track the current iteration number.

Examples:

double A[2][3] = {
#pragma CMOD amend do I = 2
[${I}] = {
#pragma CMOD amend do J = 3
[${J}] = ${I} + ${J},
#pragma CMOD done
},
#pragma CMOD done
};

will result in the following replacement:

double A[2][3] = {
[0] = {
[0] = 0 + 0,
[1] = 0 + 1,
[2] = 0 + 2,
},
[1] = {
[0] = 1 + 0,
[1] = 1 + 1,
[2] = 1 + 2,
},
};

Coding and configuration

SRC="$_" . "${0%%/${0##*/}}/import.sh"

Imports

The following sh-modules are imported:

• arguments
• seq

Details

See also:

bind

env

foreach

let