31 lines
783 B
Forth
31 lines
783 B
Forth
This implements some words to return a range of numbers on the stack.
|
|
It's probably best to capture these values in an array.
|
|
|
|
First is a word to return values from a lower to upper limit, incrementing
|
|
upwards. The returned values are inclusive of the limits.
|
|
|
|
~~~
|
|
:range-inc (lh-a)
|
|
over - n:inc [ I over + swap ] indexed-times drop ;
|
|
~~~
|
|
|
|
Next is a word to return values from an upper to lower limit, decrementing
|
|
upwards. The returned values are inclusive of the limits.
|
|
|
|
~~~
|
|
:range-dec (hl-a)
|
|
over &- dip swap n:inc [ I over swap - swap ] indexed-times drop ;
|
|
~~~
|
|
|
|
The last word takes the limits and calls the appropriate word.
|
|
|
|
~~~
|
|
:range (nn-a)
|
|
dup-pair gt? [ range-dec ] [ range-inc ] choose ;
|
|
~~~
|
|
|
|
As a simple test case:
|
|
|
|
```
|
|
{ #1 #5 range } [ n:put sp ] a:for-each
|
|
```
|