Rebol calc-workdays 不适用于红色

Question

我试图以红色执行此脚本 https://www.mail-archive.com/rebol-bounce@rebol.com/msg01222.html，但我不明白为什么我得到

calc-workdays now/date 3-feb-2007 [1-feb-2007]

*** Script Error: > operator is missing an argument

*** Where: do

*** Stack: print calc-workdays

    found?: func [
        "Returns TRUE if value is not NONE."
        value
    ][
        not none? :value
    ]

    calc-workdays: func [
        "Return number of workdays between two dates, excluding holidays"
        date1 [date!] "Start date"
        date2 [date!] "End date"
        holidays [block!] "Block of dates to exclude (holidays, etc.)"
        /non "Return number of non-work days (weekend + holidays) between 2 dates"
        /local days day1 day2 diff param
    ][
        days: copy []
        set [day1 day2] sort reduce [date1 date2]
        diff: day2 - day1
        param: pick [[> 5 union][< 6 exclude]] either found? non [1][2]
        loop diff [
            day1: day1 + 1
            if do param/1 day1/weekday param/2 [append days day1]
        ]
        return length? do param/3 days holidays
    ]

Answer 1

Rebol2好像可以让你传一个WORD！做，并评估它。如果这个词恰好是一个包含 ANY-FUNCTION! 的变量，它将是运行...如果它是一个中缀 "OP!" 那么它将是运行就好像它是不是中缀。

>> do quote > 1 2
== false

>> do quote < 1 2
== true

红色也这样做，但 DO 不是可变的。它只能运行 0 个参数函数：

>> foo: does [print "hi"]

>> do quote foo
hi    

>> bar: func [x] [print x]

>> do quote bar "hi"
*** Script Error: bar is missing its x argument

有问题的脚本试图使用此功能。但它可以用普通的 COMPOSE 或 REDUCE 来完成。所以改变：

if do param/1 day1/weekday param/2 [append days day1]

收件人：

if do reduce [day1/weekday param/1 param/2] [append days day1]

那会在>或<运算符中间构建一个代码块，并正常执行它而不依赖这个WORD！-DO的dispatch或infix-dropping行为.

同样，更改：

return length? do param/3 days holidays

收件人：

return length? do reduce [param/3 days holidays]

通过这些更改，并删除 found?（这不是必需的）然后它似乎可以工作。

Rebol calc-workdays 不适用于红色

Rebol calc-workdays not working on Red

rebol

red