`unfmt`: A compile-time pattern matching library that reverses the interpolation process of `format!`.

onlinepersona, 1 month ago

What am I missing? Seems like it just puts the parameter in Some?

Anti Commercial-AI license

Ephera, 1 month ago

You must’ve read that wrong.

The first example, but formatted differently:

<span style="font-weight:bold;color:#a71d5d;">let</span><span style="color:#323232;"> value </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#183691;">"My name is Rho."</span><span style="color:#323232;">;
</span><span style="font-weight:bold;color:#a71d5d;">let</span><span style="color:#323232;"> result </span><span style="font-weight:bold;color:#a71d5d;">= </span><span style="color:#323232;">unformat!(</span><span style="color:#183691;">"My {} is {}."</span><span style="color:#323232;">, value);
</span>

Now, result contains:

<span style="color:#0086b3;">Some</span><span style="color:#323232;">((</span><span style="color:#183691;">"name"</span><span style="color:#323232;">, </span><span style="color:#183691;">"Rho"</span><span style="color:#323232;">))
</span>

…because the words “name” and “Rho” in value happened to be at the position of the {}-slots in the unformat!()-pattern.