rebol：如何创建解析大括号的规则？

Question

我真的还没有掌握解析规则:)

我该如何解析这个？

to-parse: [entity Person {
    String name
    String lastName
    Address home
    Address business
}]

这不起作用：

entity-rule: ['entity word! #"{" to end]
>> parse to-parse entity-rule
== false
>>

Answer 1

to-parse 块中的第三个元素不是字符 {。它是一个字符串——REBOL字符串可以被描述为“...”或{...}

type? to-parse/3
== string!
to-parse/3
{
   String name
   String lastName
   Address home
   Address business
}

要成功解析块，您需要寻找一个字符串：

entity-rule: ['entity word! string! to end]
parse to-parse entity-rule
== true

Answer 2

to-parse: [entity Person {
    String name
    String lastName
    Address home
    Address business
}]

person-rule: [  
    thru "String " copy name to newline (append names name) thru newline |
    thru "Address " copy address to newline (append addresses address) thru newline |
    skip end
]

parse to-parse [ 
    'entity 'person 
    set details string! (
        names: copy [] addresses: copy []
        parse details [ some person-rule ]
    )
]

会将名称收集到块名称中，并将地址收集到块地址中。
不过这个答案在 Rebol3 中不起作用。不知道为什么不。