在 case 条件中使用变量的 Switch 语句

发布于 2024-12-17 16:03:12 字数 386 浏览 0 评论 0原文

是否可以在 Maya Mel 脚本语言中创建在 case 条件下使用变量的 Switch 语句？

大致的内容（为了解释起见，这是一个愚蠢的例子）：

$val1 = "foo";
$val2 = "bar";
// imagine $input as an argument of some proc
switch ($input)
{
case $val1:
    print "Input is 'foo'";
    break;

case $val2:
    print "Input is 'bar'";
    break;
}

Ps我尝试过，但它不起作用，但你可能知道另一种选择。

多谢

原文

Is it possible to create Switch statements that use variables in the case condition, in Maya Mel Script language?

Something along the lines (stupid example for the sake of explanation):

$val1 = "foo";
$val2 = "bar";
// imagine $input as an argument of some proc
switch ($input)
{
case $val1:
    print "Input is 'foo'";
    break;

case $val2:
    print "Input is 'bar'";
    break;
}

P.s. I tried that and it didn't work, but you might know of another option.

Thanks a lot

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如梦 2024-12-24 16:03:12

您不能直接使用变量作为 case 值，但您可以构建一个包含要执行的代码的字符串，并将变量替换为其值，然后将该字符串传递给 eval 函数：

$val1 = "foo";
$val2 = "bar";
// imagine $input as an argument of some proc
string $cmd;
$cmd =  "switch (\"" + $input + "\")";
$cmd += "{";
$cmd += "case \"" + $val1 + "\":";
$cmd += "    print \"Input is 'foo'\";";
$cmd += "    break;";
$cmd += "case \"" + $val2 + "\":";
$cmd += "    print \"Input is 'bar'\";";
$cmd += "    break;";
$cmd += "}";
eval $cmd;

You can't use variables as case values directly, but you can build a string containing the code that you want to execute, with variables replaced with their values, and pass that string to the eval function:

$val1 = "foo";
$val2 = "bar";
// imagine $input as an argument of some proc
string $cmd;
$cmd =  "switch (\"" + $input + "\")";
$cmd += "{";
$cmd += "case \"" + $val1 + "\":";
$cmd += "    print \"Input is 'foo'\";";
$cmd += "    break;";
$cmd += "case \"" + $val2 + "\":";
$cmd += "    print \"Input is 'bar'\";";
$cmd += "    break;";
$cmd += "}";
eval $cmd;

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