如何将VIM中的语法高光颜色设置为语法脚本中的局部变量的值？

Question

我想要做的事情如下所示：

"define our language struct variables with their default syntax color values
let s:procedural_fg = "Red"
let s:declarative_fg = "Blue"
let s:string_fg = "DarkGray"

...

"Now the actual highlighting directives based on the groups defined elsewhere
hi cyLoops guifg=s:procedural_fg
hi cyConstants guifg=s:declarative_fg
hi cyString guifg=s:string_fg

但是VIM不允许我以这种方式设置guifg值(“错误:无法分配颜色s:procedural_fg”...对于每个变量名依此类推)。我想以这种方式定义语法突出显示，以便可以通过更改局部变量值，然后刷新缓冲区(或任何需要应用新颜色值的方法)来动态更改它。

这可以在VIM语法脚本中完成吗？如果是这样的话，是怎么做的？

我已经尝试了几种变体：

"define our language struct variables with their default syntax color values
let s:procedural_fg = Red
let s:declarative_fg = Blue
let s:string_fg = DarkGray

...

"Now the actual highlighting directives based on the groups defined elsewhere
hi cyLoops guifg=s:procedural_fg
hi cyConstants guifg=s:declarative_fg
hi cyString guifg=s:string_fg

和

"define our language struct variables with their default syntax color values
let s:procedural_fg = v:Red
let s:declarative_fg = v:Blue
let s:string_fg = v:DarkGray

...

"Now the actual highlighting directives based on the groups defined elsewhere
hi cyLoops guifg=s:procedural_fg
hi cyConstants guifg=s:declarative_fg
hi cyString guifg=s:string_fg

这导致错误，抱怨Red、Blue等或v:Red、v:Blue等是未定义的和/或无效的表达式。

谢谢，CCJ

Answer 1

使用:exec，就像eval对于Perl或bash shell一样：

:exec 'hi cyLoops guifg=' . s:procedural_fg