NAME

VM::Dreamer::Init - Functions to help with Initialization

SYNOPSIS

my $counter = init_counter(8); # [ 0, 0, 0, 0, 0, 0, 0, 0 ] my $greatest_digit = greatest_digit(8); # 7 my $greatest_number = greatest_number( 10, 4); # '9999' my $total_width = total_width( 1, 2 ); # 3

DESCRIPTION

init_counter

Takes a positive integer n and returns a reference to an an array of n elements, each of which is 0.

In Dreamer, counters are machine parts like the counter and the accumulator.

greatest_digit

Takes a positive integer n and returns n - 1. Really only meant to be used for n from 2 to 10 inclusive, though no validation is performed here. The idea is that if the base is 8, the greatest digit would be 7.

greatest_number

Given a base and a width, returns a string of n digits, each of which is one less then the base.

For example, if the base is 2 and the width is 9, the greatest_number would be 111111111.

total_width

Just adds up the elements in an array, but also performes validation checking to make sure that each element is zero or a positive integer.

For example, if the op_code_width is 4 and the operand width is 12, the total_width would be 16. This is useful for figuring out how long an instruction is given the widths of its parts.

As Dreamer only operates on one operand machines right now, this will really only be passed 2 elements in the array - the op_code_width and the operand_width. But, I decided to generalize it for use later.

AUTHOR

William Stevenson <william at coders dot coop>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2013 by William Stevenson.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)