value bug with wildcard?

[ramagottfried]

not sure what's going on here exactly -- any ideas? is it a bug? I think it might be.

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-----------end_max5_patcher-----------

[ramagottfried]

(I just edited the example slightly to make it clearer)

[ramagottfried]

ah! the plot thickens: /* is a bundle, but /1 is a string

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[maccallum]

Ok, so this is extremely confusing, but not a bug. The input bundle is

/* : { /foo : 1}

and the program is

/url = getaddresses(),
/data = value(/url)

The first line of the program produces a binding of /url = "/*", so now the working bundle is

/* : { /foo : 1},
/url = "/*"

Then, when value(/url) is evaluated in the second line, the address (string) /url is compared to the pattern in the first message of the working bundle, which is /*, which produces a match, resulting in value( { /foo : 1 } ), which the value function just bails on.

There is a bug here--it's that value doesn't report an error. But in terms of pattern matching, it's unfortunately doing the right thing, even if it's confusing

[ramagottfried]

why does value do pattern matching with the wild card? I think only match should do pattern matching, otherwise this means you can't operate on wildcard addresses, which would be unfortunate.

[ramagottfried]

did you see the second issue?

<pre><code>
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-----------end_max5_patcher-----------
</code></pre>

[ramagottfried]

or is that similar, that typetags also does pattern matching? wow,... still really not sure that o.expr should do pattern matching without calling match

[maccallum]

@ramagottfried, I think you're right that pattern matching in o.expr should be explicit, rather than implicit. I just checked the history, and this behavior has been there forever, so this would be a breaking change, although, I'm not sure anyone relies on it. I'm going to add this to the 1.4 list--I think it's too late to consider something as deep as this for 1.3.

[ramagottfried]

@maccallum cool, that sounds good -- I'm fairly sure that not many people are using the hidden pattern matching functionality, since as far as I know there is no example of this in the documentation, I only stumbled on it when trying to operate on a wildcard address (that was then being sent to another process where the matching happens).