[REBOL] [new-line new-lines] NEW-LINES dialect wrapper for NEW-LINE func
From: gregg:pointillistic at: 17-May-2007 17:43
Anton said:
AR> and NEW-LINE bugs me more, where you have to wrap the
AR> thing you're modifying in a sandwhich of 2 arguments.
Yeah, you're never going to get it things right for everybody; and
I've thought, too, that NEW-LINE doesn't read particularly well,
so...what do you think of something like this (watch for wrap):
new-lines: func [
input [block!]
/local
set clear insert remove other ords keys
=ord =state =all =skip =block
][
insert: set: on
remove: clear: off
other: 2
ords: [first second third fourth fifth sixth seventh eigth ninth tenth]
keys: append copy ords [in from every all marker markers item items]
input: reduce/only bind/copy input 'ords keys
=ord: =state: =all: =skip: none
ord=: [
set =ord ['first | 'second | 'third | 'fourth | 'fifth
| 'sixth | 'seventh | 'eigth | 'ninth | 'tenth]
(=skip: index? find ords =ord)
]
rule=: [
any [
'all (=all: true)
| [set =state logic!]
| ['every [set =skip integer! | ord=]]
| [opt ['in | 'from] set =block block!]
| ['marker | 'markers | 'item | 'items]
] (
if all [=block not none? =state] [
either =skip [new-line/skip =block =state =skip] [
either =all [new-line/all =block =state] [
new-line =block =state
]
]
]
)
]
either parse input rule= [=block] [none]
]
Examples:
b: [1 2 3 4 5]
new-lines [all on in b]
new-lines [all off in b]
new-lines [every other on in b]
new-lines [every other in b off ]
new-lines [in b every third item on]
new-lines [in b off every 3]
new-lines [insert marker in b every 2 items]
new-lines [remove marker in b every 3 items]
new-lines [set all markers in b]
new-lines [clear all markers in b]
new-lines [set every other marker in b]
new-lines [clear marker every other item in b]
new-lines [b all off]
new-lines [b on]
new-lines [b off]
--Gregg
