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TITLE

DRAFT: Synopsis 32: Setting Library - Callable

AUTHORS

    Tim Nelson <wayland@wayland.id.au>
    Larry Wall <larry@wall.org>

VERSION

    Created: 26 Feb 2009

    Last Modified: 3 May 2009
    Version: 2

The document is a draft.

If you read the HTML version, it is generated from the Pod in the specs repository under https://github.com/perl6/specs/blob/master/S32-setting-library/Callable.pod so edit it there in the git repository if you would like to make changes.

This document documents Code, Block, Signature, Capture, Routine, Sub, Method, Submethod, and Macro.

Roles

Callable

    role Callable {...}

The Callable role implies the ability to support postcircumfix:<( )>.

Code

    # Base class for all executable objects
    role Code {
        method Signature signature() {...}
        method Code      assuming(...) {...}
        method           do() {...} # See L<S12/Introspection>
        method Bool defined {...}
        # XXX What does do() return?  I mean, it's a "method body", but what's that?
    }

For Code, the .defined method returns whether a body has been defined. A body consisting only of ..., !!!, or ??? (with optional message arguments) does not count as defined.

To test if a name has been declared, look up the symbol in the appropriate symbol table.

Block

    # Executable objects that have lexical scopes
    role Block does Code does Callable {
        method next() {...}
        method last() {...}
        method redo() {...}
        method leave() {...}
        method labels() {...}
        method as() {...} # See L<S12/Introspection> and L<S02/Value types>
    }

Signature

 # Function parameters (left-hand side of a binding)
 role Signature {...}

Capture

 # Function call arguments (right-hand side of a binding)
 role Capture does Positional does Associative {...}

WrapHandle

 role WrapHandle {...}

Classes

Routine

 class Routine does Block {
      method WrapHandle wrap(Code $code) {...}
      method Routine    unwrap(Wraphandle $original) {...}
      method Str        name() {...}
      method Bool       multi() {...}
 }
unwrap

See "Wrapping" in S06.

wrap
 method wrap(Code $code) {...}

See "Wrapping" in S06.

Sub

    class Sub isa Routine {...}

Method

    class Method isa Routine {...}

Submethod

    class Submethod isa Routine {...} # XXX or should this be isa Sub

Macro

    class Macro isa Routine {...}

Additions

Please post errors and feedback to perl6-language. If you are making a general laundry list, please separate messages by topic.

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