Mon Mar 28 12:13:41 EST 2005 Mark Stosberg <[EMAIL PROTECTED]>
* add PORTING_HOWTO to darcs.
Mon Mar 28 12:19:27 EST 2005 Mark Stosberg <[EMAIL PROTECTED]>
* add request for specific example subroutine signature porting
Mon Mar 28 12:24:10 EST 2005 Mark Stosberg <[EMAIL PROTECTED]>
* enhance Regexp porting notes
New patches:
[add PORTING_HOWTO to darcs.
Mark Stosberg <[EMAIL PROTECTED]>**20050328171341]
<
> {
addfile ./modules/PORTING_HOWTO
hunk ./modules/PORTING_HOWTO 1
+Mini HowTo: How to port Perl 5 modules to Perl 6
+
+ - Before you start porting a module, make sure you understand the class
+ hierarchy of that module. It helps if you've actually used that module in
+ Perl 5 :)
+
+ - Port a module even if it depends on some other (not yet ported) modules --
+ the dependencies can be ported later on.
+
+ - Often, the translation P5 -> P6 is quite mechanic:
+ - $array[idx] -> @array[idx]
+ - a ? b : c -> a ?? b :: c
+ - $self->method(...) -> .method(...)
+ - sub { my ($self, $a, $b) = @_; ... } ->
+ method($a, $b) { ... }
+ - $x =~ s/.../.../g -> $x ~~ s:g/.../.../
+ - $self->{foo} -> $.foo
+ - $foo = "bar" unless defined $foo ->
+ $foo //= "bar" # (//) and (//=) will be in 5.9, too, IIRC
+ - if($foo eq "a" or $foo eq "b" or $foo eq "c") {...} ->
+ if $foo eq "a"|"b"|"c" {...}
+ - foreach my $foo (@baz) {...} ->
+ for @baz -> $foo {...}
+ - Regular expressions:
+ [abc] -> <[abc]>
+ [^abc] -> <-[abc]>
+ (?:...) -> [...]
+
+ - Often, you can remove all that Perl 5 argument parsing and simply
+ substitute it by a nice signature.
+
+ - require Exporter;
+ our @ISA = qw< Exporter >;
+ our @EXPORT = qw< foo >;
+ sub foo { ... }
+ # ->
+ sub foo(...) is export { ... }
+
+ - return map {.4.} sort {.3.} grep {.2.} map {.1.} ->
+ map {.1.} ==> grep {.2.} ==> sort {.3.} ==> map {.4.} ==> return
+
+ - Especially Perl 6's translation of Perl 5's getter/setter idiom is cool:
+
+ # Perl 5
+ sub get_foo {
+ my $self = shift;
+
+ my $ret = $self->{foo};
+ return lc $ret; # always normalize
+ }
+
+ sub set_foo {
+ my ($self, $to) = @_;
+
+ $to =~ s/\s+$//; # strip whitespace at the end
+ $self->{foo} = $to;
+ }
+
+ # -> Perl 6 (see L<S06/"Lvalue subroutines"> for information about Proxy)
+ has $:foo;
+ sub foo() is rw {
+ return new Proxy:
+ FETCH => { lc $:foo },
+ STORE => -> $to is copy {
+ $to ~~ s/\s+$//;
+ $:foo = $to;
+ };
+ }
+ # And then:
+ say $obj.foo;
+ $obj.foo = "..."; # Notice: Standard assignment syntax!
+ # Assignments should look like assignments, not like
+ # method calls
+
+ - If you trust the user to give correct data to accessors, you can also use:
+ has $.foo is rw;
+ - Or:
+ subtype OddInt of Int where { $^n % 2 == 1 }
+ has OddInt $.foo is rw;
+ # And then:
+ $obj.foo = 12; # will die
}
[add request for specific example subroutine signature porting
Mark Stosberg <[EMAIL PROTECTED]>**20050328171927]
<
> {
hunk ./modules/PORTING_HOWTO 30
(?:...) -> [...]
- Often, you can remove all that Perl 5 argument parsing and simply
- substitute it by a nice signature.
+ substitute it by a nice signature. (TODO: give examples of this.)
- require Exporter;
our @ISA = qw< Exporter >;
}
[enhance Regexp porting notes
Mark Stosberg <[EMAIL PROTECTED]>**20050328172410]
<
> {
hunk ./modules/PORTING_HOWTO 16
- $self->method(...) -> .method(...)
- sub { my ($self, $a, $b) = @_; ... } ->
method($a, $b) { ... }
- - $x =~ s/.../.../g -> $x ~~ s:g/.../.../
+ - $x =~ s/.../.../g -> $x ~~ s:perl5:g/.../.../
- $self->{foo} -> $.foo
- $foo = "bar" unless defined $foo ->
$foo //= "bar" # (//) and (//=) will be in 5.9, too, IIRC
hunk ./modules/PORTING_HOWTO 25
- foreach my $foo (@baz) {...} ->
for @baz -> $foo {...}
- Regular expressions:
+ The simplest way to port is to declare that you are using the Perl5 syntax:
+ m/$my_re/ -> m:perl5/$my_re/
+
+ Here are some specific differences with Perl 6 Regexp syntax:
[abc] -> <[abc]>
[^abc] -> <-[abc]>
(?:...) -> [...]
hunk ./modules/PORTING_HOWTO 32
+
+ More details of Perl6 REs:
+ http://dev.perl.org/perl6/synopsis/S05.html
- Often, you can remove all that Perl 5 argument parsing and simply
substitute it by a nice signature. (TODO: give examples of this.)
}
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[Basic test for try { CATCH {} }
Yuval Kogman <[EMAIL PROTECTED]>**20050304175151
No good examples in exegis/apocalypse
Only does CATCH (no other constructs, no default)
Does not tests 'use fatal' stuff
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[Test for given blocks
Yuval Kogman <[EMAIL PROTECTED]>**20050304170743]
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[more -Wall work, esp in Rule/
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[refactored src/Rule/Pos to use field accessors
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[turned off certain warnings. leaving the most important ones
Isaac Jones <[EMAIL PROTECTED]>**20050228055609]
[toward -Wall cleanliness. focus on non-used variables. see notes!
Isaac Jones <[EMAIL PROTECTED]>**20050228043931
Here are some funny things I ran into while removing references to
unused variables:
suspicious shadowing of the "sub" symbol in reduceStatements
Eval.hs:145
suspicious non-use of "name" parameter to "subs" (removed)
why throw away the cxt in foldParam Prim.hs:470
- and Evalute Eval.hs:72
- and Eval.hs:180
]
[fixed bug where RuleParser passed into runRule not being used. please double-check.
Isaac Jones <[EMAIL PROTECTED]>**20050228040725]
[added error messages for non-exhaustive patterns
Isaac Jones <[EMAIL PROTECTED]>**20050228035431
Please be sure to check over these in case any of them are actually
bugs. The "char" related ones in Bind.hs (bindEmpty for instance)
might be better fixed with a type so that the type system will enforce
well-formedness?
]
[toward -Wall cleanliness
Isaac Jones <[EMAIL PROTECTED]>**20050228031404]
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* viirya's patch to fix 1e-2.
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* parameter binding.
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* full Synopsis 06 implemented!
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* global subroutines and variables.
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* global variables and subroutines!
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* higher order parameters
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* extract higher-order function parameters.
]
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[TAG 6.0.1
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Patch bundle hash:
0e66f6320f9ddaee5e6985e9c8a1f332a9bd4c3b
