case statement

It's all in here: http://www.scala-lang.org/sites/default/files/linuxsoft_archives/docu/files/ScalaReference.pdf
Specifically, section 8.5 (page 122)


On 27 April 2011 17:58, Jiansen <jiansenhe@gmail.com> wrote:

Hi,

Does someone know how case statement is implemented in Scala? Is
"case" a primitive keyword or a function in a library?  It's
interesting to see that a group of case statements is an instance of
PartialFunction.  I would like to know more details about its
implementation.

Thanks in advance.

Jiansen

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On Wednesday April 27 2011, Jiansen wrote:
> Hi,
>
> Does someone know how case statement is implemented in Scala? Is
> "case" a primitive keyword or a function in a library? It's
> interesting to see that a group of case statements is an instance of
> PartialFunction. I would like to know more details about its
> implementation.
>
> Thanks in advance.
>
> Jiansen

It's not library functionality. "case" is a reserved keyword and has
significant portions of the compiler devoted to it and its many forms.

The treatment of a block of cases (when not used with "match") as a
PartialFunction is likewise a special case of a Function literal
handled by the compiler.

The "Compiler Corner" and "Compiler Corner Reloaded" are good starting
points for information on the implementation of the Scala compiler.
It's not a simple thing...

Randall Schulz