rebol / red parse with [to end] 规则

Question

我正在尝试从头开始理解解析，所以不要告诉我在这种情况下使用拆分。

sentence: "This is a sentence"

parse sentence [
    any [
        [any space] copy text [to space | to end] skip
        (print text)
    ]
 ]

为什么我没有得到句子的最后一个字，只有：

This
is
a

[to end] 没用吗？

Answer 1

to end 确实有效，但是你有 skip 并且你已经到了最后，所以 skip 失败了。看到这个：

>> parse sentence [any [[any space] copy text [to space | to end ] (print text) skip]]
This
is
a
sentence

Answer 2

没有 to 和 end 的替代解决方案

sentence: "This is a sentence"
space:  charset " "
chars: complement space

parse sentence [
    any [
       any space 
       copy text some chars
       (print text) 
    ]
]

在 Rebol2 中你必须使用 parse/all，如果你处理字符串，但是 Rebol2 中最简单的拆分解决方案是

>> parse sentence none
== ["This" "is" "a" "sentence"]

rebol / red parse with [to end] 规则

rebol / red parse with [to end] rule

rebol

red