package ExtUtils::Constant;
-use vars qw (@ISA $VERSION %XS_Constant %XS_TypeSet @EXPORT_OK %EXPORT_TAGS);
-$VERSION = '0.08';
+use vars qw (@ISA $VERSION @EXPORT_OK %EXPORT_TAGS);
+$VERSION = 0.16;
=head1 NAME
WriteConstants(
NAME => 'Foo',
NAMES => [qw(FOO BAR BAZ)],
- C_FILE => 'constants.c',
- XS_FILE => 'constants.xs',
);
# Generates wrapper code to make the values of the constants FOO BAR BAZ
# available to perl
Generally one only needs to call the C<WriteConstants> function, and then
- #include "constants.c"
+ #include "const-c.inc"
in the C section of C<Foo.xs>
- INCLUDE constants.xs
+ INCLUDE: const-xs.inc
in the XS section of C<Foo.xs>.
A fixed length thing, given as a [pointer, length] pair. If you know the
length of a string at compile time you may use this instead of I<PV>
-=item PVN
+=item SV
A B<mortal> SV.
=cut
-require 5.006; # I think, for [:cntrl:] in REGEXP
-use warnings;
+if ($] >= 5.006) {
+ eval "use warnings; 1" or die $@;
+}
use strict;
-use Carp;
+use Carp qw(croak cluck);
use Exporter;
-use Text::Wrap;
-$Text::Wrap::huge = 'overflow';
-$Text::Wrap::columns = 80;
+use ExtUtils::Constant::Utils qw(C_stringify);
+use ExtUtils::Constant::XS qw(%XS_Constant %XS_TypeSet);
@ISA = 'Exporter';
%EXPORT_TAGS = ( 'all' => [ qw(
XS_constant constant_types return_clause memEQ_clause C_stringify
- C_constant autoload WriteConstants
+ C_constant autoload WriteConstants WriteMakefileSnippet
) ] );
@EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
-%XS_Constant = (
- IV => 'PUSHi(iv)',
- UV => 'PUSHu((UV)iv)',
- NV => 'PUSHn(nv)',
- PV => 'PUSHp(pv, strlen(pv))',
- PVN => 'PUSHp(pv, iv)',
- SV => 'PUSHs(sv)',
- YES => 'PUSHs(&PL_sv_yes)',
- NO => 'PUSHs(&PL_sv_no)',
- UNDEF => '', # implicit undef
-);
-
-%XS_TypeSet = (
- IV => '*iv_return =',
- UV => '*iv_return = (IV)',
- NV => '*nv_return =',
- PV => '*pv_return =',
- PVN => ['*pv_return =', '*iv_return = (IV)'],
- SV => '*sv_return = ',
- YES => undef,
- NO => undef,
- UNDEF => undef,
-);
-
-
-=item C_stringify NAME
-
-A function which returns a correctly \ escaped version of the string passed
-suitable for C's "" or ''. It will also be valid as a perl "" string.
-
-=cut
-
-# Hopefully make a happy C identifier.
-sub C_stringify {
- local $_ = shift;
- return unless defined $_;
- s/\\/\\\\/g;
- s/([\"\'])/\\$1/g; # Grr. fix perl mode.
- s/\n/\\n/g; # Ensure newlines don't end up in octal
- s/\r/\\r/g;
- s/\t/\\t/g;
- s/\f/\\f/g;
- s/\a/\\a/g;
- s/([[:cntrl:]])/sprintf "\\%03o", ord $1/ge;
- s/\177/\\177/g; # DEL doesn't seem to be a [:cntrl:]
- $_;
-}
-
=item constant_types
A function returning a single scalar with C<#define> definitions for the
=cut
-sub constant_types () {
- my $start = 1;
- my @lines;
- push @lines, "#define PERL_constant_NOTFOUND\t$start\n"; $start++;
- push @lines, "#define PERL_constant_NOTDEF\t$start\n"; $start++;
- foreach (sort keys %XS_Constant) {
- push @lines, "#define PERL_constant_IS$_\t$start\n"; $start++;
- }
- push @lines, << 'EOT';
-
-#ifndef NVTYPE
-typedef double NV; /* 5.6 and later define NVTYPE, and typedef NV to it. */
-#endif
-EOT
-
- return join '', @lines;
+sub constant_types {
+ ExtUtils::Constant::XS->header();
}
-=item memEQ_clause NAME, CHECKED_AT, INDENT
-
-A function to return a suitable C C<if> statement to check whether I<NAME>
-is equal to the C variable C<name>. If I<CHECKED_AT> is defined, then it
-is used to avoid C<memEQ> for short names, or to generate a comment to
-highlight the position of the character in the C<switch> statement.
-
-=cut
-
sub memEQ_clause {
-# if (memEQ(name, "thingy", 6)) {
- # Which could actually be a character comparison or even ""
- my ($name, $checked_at, $indent) = @_;
- $indent = ' ' x ($indent || 4);
- my $len = length $name;
-
- if ($len < 2) {
- return $indent . "{\n" if (defined $checked_at and $checked_at == 0);
- # We didn't switch, drop through to the code for the 2 character string
- $checked_at = 1;
- }
- if ($len < 3 and defined $checked_at) {
- my $check;
- if ($checked_at == 1) {
- $check = 0;
- } elsif ($checked_at == 0) {
- $check = 1;
- }
- if (defined $check) {
- my $char = C_stringify (substr $name, $check, 1);
- return $indent . "if (name[$check] == '$char') {\n";
- }
- }
- # Could optimise a memEQ on 3 to 2 single character checks here
- $name = C_stringify ($name);
- my $body = $indent . "if (memEQ(name, \"$name\", $len)) {\n";
- $body .= $indent . "/* ". (' ' x $checked_at) . '^'
- . (' ' x ($len - $checked_at + length $len)) . " */\n"
- if defined $checked_at;
- return $body;
+ cluck "ExtUtils::Constant::memEQ_clause is deprecated";
+ ExtUtils::Constant::XS->memEQ_clause({name=>$_[0], checked_at=>$_[1],
+ indent=>$_[2]});
}
-=item assign INDENT, TYPE, PRE, POST, VALUE...
-
-A function to return a suitable assignment clause. If I<TYPE> is aggregate
-(eg I<PVN> expects both pointer and length) then there should be multiple
-I<VALUE>s for the components. I<PRE> and I<POST> if defined give snippets
-of C code to preceed and follow the assignment. I<PRE> will be at the start
-of a block, so variables may be defined in it.
-
-=cut
-
-# Hmm. value undef to to NOTDEF? value () to do NOTFOUND?
-
-sub assign {
+sub return_clause ($$) {
+ cluck "ExtUtils::Constant::return_clause is deprecated";
my $indent = shift;
- my $type = shift;
- my $pre = shift;
- my $post = shift || '';
- my $clause;
- my $close;
- if ($pre) {
- chomp $pre;
- $clause = $indent . "{\n$pre";
- $clause .= ";" unless $pre =~ /;$/;
- $clause .= "\n";
- $close = "$indent}\n";
- $indent .= " ";
- }
- die "Can't generate code for type $type" unless exists $XS_TypeSet{$type};
- my $typeset = $XS_TypeSet{$type};
- if (ref $typeset) {
- die "Type $type is aggregate, but only single value given"
- if @_ == 1;
- foreach (0 .. $#$typeset) {
- $clause .= $indent . "$typeset->[$_] $_[$_];\n";
- }
- } elsif (defined $typeset) {
- die "Aggregate value given for type $type"
- if @_ > 1;
- $clause .= $indent . "$typeset $_[0];\n";
- }
- chomp $post;
- if (length $post) {
- $clause .= "$post";
- $clause .= ";" unless $post =~ /;$/;
- $clause .= "\n";
- }
- $clause .= "${indent}return PERL_constant_IS$type;\n";
- $clause .= $close if $close;
- return $clause;
-}
-
-=item return_clause VALUE, TYPE, INDENT, MACRO, DEFAULT, PRE, POST, PRE, POST
-
-A function to return a suitable C<#ifdef> clause. I<MACRO> defaults to
-I<VALUE> when not defined. If I<TYPE> is aggregate (eg I<PVN> expects both
-pointer and length) then I<VALUE> should be a reference to an array of
-values in the order expected by the type. C<C_constant> will always call
-this function with I<MACRO> defined, defaulting to the constant's name.
-I<DEFAULT> if defined is an array reference giving default type and and
-value(s) if the clause generated by I<MACRO> doesn't evaluate to true.
-The two pairs I<PRE> and I<POST> if defined give C code snippets to proceed
-and follow the value, and the default value.
-
-=cut
-
-sub return_clause ($$$$$$$$$) {
-##ifdef thingy
-# *iv_return = thingy;
-# return PERL_constant_ISIV;
-##else
-# return PERL_constant_NOTDEF;
-##endif
- my ($value, $type, $indent, $macro, $default, $pre, $post,
- $def_pre, $def_post) = @_;
- $macro = $value unless defined $macro;
- $indent = ' ' x ($indent || 6);
-
- my $clause;
-
- ##ifdef thingy
- if (ref $macro) {
- $clause = $macro->[0];
- } elsif ($macro ne "1") {
- $clause = "#ifdef $macro\n";
- }
-
- # *iv_return = thingy;
- # return PERL_constant_ISIV;
- $clause .= assign ($indent, $type, $pre, $post,
- ref $value ? @$value : $value);
-
- if (ref $macro or $macro ne "1") {
- ##else
- $clause .= "#else\n";
-
- # return PERL_constant_NOTDEF;
- if (!defined $default) {
- $clause .= "${indent}return PERL_constant_NOTDEF;\n";
- } else {
- my @default = ref $default ? @$default : $default;
- $type = shift @default;
- $clause .= assign ($indent, $type, $def_pre, $def_post, @default);
- }
-
- ##endif
- if (ref $macro) {
- $clause .= $macro->[1];
- } else {
- $clause .= "#endif\n";
- }
- }
- return $clause
+ ExtUtils::Constant::XS->return_clause({indent=>$indent}, @_);
}
-=item switch_clause INDENT, NAMELEN, ITEMHASH, ITEM...
-
-An internal function to generate a suitable C<switch> clause, called by
-C<C_constant> I<ITEM>s are in the hash ref format as given in the description
-of C<C_constant>, and must all have the names of the same length, given by
-I<NAMELEN> (This is not checked). I<ITEMHASH> is a reference to a hash,
-keyed by name, values being the hashrefs in the I<ITEM> list.
-(No parameters are modified, and there can be keys in the I<ITEMHASH> that
-are not in the list of I<ITEM>s without causing problems).
-
-=cut
-
sub switch_clause {
- my ($indent, $comment, $namelen, $items, @items) = @_;
- $indent = ' ' x ($indent || 2);
-
- my @names = sort map {$_->{name}} @items;
- my $leader = $indent . '/* ';
- my $follower = ' ' x length $leader;
- my $body = $indent . "/* Names all of length $namelen. */\n";
- if ($comment) {
- $body = wrap ($leader, $follower, $comment) . "\n";
- $leader = $follower;
- }
- $body .= wrap ($leader, $follower, join (" ", @names) . " */") . "\n";
- # Figure out what to switch on.
- # (RMS, Spread of jump table, Position, Hashref)
- my @best = (1e38, ~0);
- foreach my $i (0 .. ($namelen - 1)) {
- my ($min, $max) = (~0, 0);
- my %spread;
- foreach (@names) {
- my $char = substr $_, $i, 1;
- my $ord = ord $char;
- $max = $ord if $ord > $max;
- $min = $ord if $ord < $min;
- push @{$spread{$char}}, $_;
- # warn "$_ $char";
- }
- # I'm going to pick the character to split on that minimises the root
- # mean square of the number of names in each case. Normally this should
- # be the one with the most keys, but it may pick a 7 where the 8 has
- # one long linear search. I'm not sure if RMS or just sum of squares is
- # actually better.
- # $max and $min are for the tie-breaker if the root mean squares match.
- # Assuming that the compiler may be building a jump table for the
- # switch() then try to minimise the size of that jump table.
- # Finally use < not <= so that if it still ties the earliest part of
- # the string wins. Because if that passes but the memEQ fails, it may
- # only need the start of the string to bin the choice.
- # I think. But I'm micro-optimising. :-)
- my $ss;
- $ss += @$_ * @$_ foreach values %spread;
- my $rms = sqrt ($ss / keys %spread);
- if ($rms < $best[0] || ($rms == $best[0] && ($max - $min) < $best[1])) {
- @best = ($rms, $max - $min, $i, \%spread);
- }
- }
- die "Internal error. Failed to pick a switch point for @names"
- unless defined $best[2];
- # use Data::Dumper; print Dumper (@best);
- my ($offset, $best) = @best[2,3];
- $body .= $indent . "/* Offset $offset gives the best switch position. */\n";
- $body .= $indent . "switch (name[$offset]) {\n";
- foreach my $char (sort keys %$best) {
- $body .= $indent . "case '" . C_stringify ($char) . "':\n";
- foreach my $name (sort @{$best->{$char}}) {
- my $thisone = $items->{$name};
- my ($value, $macro, $default, $pre, $post, $def_pre, $def_post)
- = @$thisone{qw (value macro default pre post def_pre def_post)};
- $value = $name unless defined $value;
- $macro = $name unless defined $macro;
-
- # We have checked this offset.
- $body .= memEQ_clause ($name, $offset, 2 + length $indent);
- $body .= return_clause ($value, $thisone->{type}, 4 + length $indent,
- $macro, $default, $pre, $post,
- $def_pre, $def_post);
- $body .= $indent . " }\n";
- }
- $body .= $indent . " break;\n";
- }
- $body .= $indent . "}\n";
- return $body;
-}
-
-=item params WHAT
-
-An internal function. I<WHAT> should be a hashref of types the constant
-function will return. I<params> returns a hashref keyed IV NV PV SV to show
-which combination of pointers will be needed in the C argument list.
-
-=cut
-
-sub params {
- my $what = shift;
- foreach (sort keys %$what) {
- warn "ExtUtils::Constant doesn't know how to handle values of type $_" unless defined $XS_Constant{$_};
- }
- my $params = {};
- $params->{IV} = 1 if $what->{IV} || $what->{UV} || $what->{PVN};
- $params->{NV} = 1 if $what->{NV};
- $params->{PV} = 1 if $what->{PV} || $what->{PVN};
- $params->{SV} = 1 if $what->{SV};
- return $params;
-}
-
-=item dump_names
-
-dump_names PACKAGE, SUBNAME, DEFAULT_TYPE, TYPES, INDENT, BREAKOUT, ITEM...
-
-An internal function to generate the embedded perl code that will regenerate
-the constant subroutines. Parameters are the same as for C_constant.
-
-=cut
-
-sub dump_names {
- my ($package, $subname, $default_type, $what, $indent, $breakout, @items)
- = @_;
- my (@simple, @complex);
- foreach (@items) {
- my $type = $_->{type} || $default_type;
- if ($type eq $default_type and 0 == ($_->{name} =~ tr/A-Za-z0-9_//c)
- and !defined ($_->{macro}) and !defined ($_->{value})
- and !defined ($_->{default}) and !defined ($_->{pre})
- and !defined ($_->{post}) and !defined ($_->{def_pre})
- and !defined ($_->{def_post})) {
- # It's the default type, and the name consists only of A-Za-z0-9_
- push @simple, $_->{name};
- } else {
- push @complex, $_;
- }
- }
- my $result = <<"EOT";
- /* When generated this function returned values for the list of names given
- in this section of perl code. Rather than manually editing these functions
- to add or remove constants, which would result in this comment and section
- of code becoming inaccurate, we recommend that you edit this section of
- code, and use it to regenerate a new set of constant functions which you
- then use to replace the originals.
-
- Regenerate these constant functions by feeding this entire source file to
- perl -x
-
-#!$^X -w
-use ExtUtils::Constant qw (constant_types C_constant XS_constant);
-
-EOT
- $result .= 'my $types = {map {($_, 1)} qw(' . join (" ", sort keys %$what)
- . ")};\n";
- $result .= wrap ("my \@names = (qw(",
- " ", join (" ", sort @simple) . ")");
- if (@complex) {
- foreach my $item (sort {$a->{name} cmp $b->{name}} @complex) {
- my $name = C_stringify $item->{name};
- my $line = ",\n {name=>\"$name\"";
- $line .= ", type=>\"$item->{type}\"" if defined $item->{type};
- foreach my $thing (qw (macro value default pre post def_pre def_post)) {
- my $value = $item->{$thing};
- if (defined $value) {
- if (ref $value) {
- $line .= ", $thing=>[\""
- . join ('", "', map {C_stringify $_} @$value) . '"]';
- } else {
- $line .= ", $thing=>\"" . C_stringify($value) . "\"";
- }
- }
- }
- $line .= "}";
- # Ensure that the enclosing C comment doesn't end
- # by turning */ into *" . "/
- $line =~ s!\*\/!\*" . "/!gs;
- # gcc -Wall doesn't like finding /* inside a comment
- $line =~ s!\/\*!/" . "\*!gs;
- $result .= $line;
- }
- }
- $result .= ");\n";
-
- $result .= <<'EOT';
-
-print constant_types(); # macro defs
-EOT
- $package = C_stringify($package);
- $result .=
- "foreach (C_constant (\"$package\", '$subname', '$default_type', \$types, ";
- # The form of the indent parameter isn't defined. (Yet)
- if (defined $indent) {
- require Data::Dumper;
- $Data::Dumper::Terse=1;
- $Data::Dumper::Terse=1; # Not used once. :-)
- chomp ($indent = Data::Dumper::Dumper ($indent));
- $result .= $indent;
- } else {
- $result .= 'undef';
- }
- $result .= ", $breakout" . ', @names) ) {
- print $_, "\n"; # C constant subs
-}
-print "#### XS Section:\n";
-print XS_constant ("' . $package . '", $types);
-__END__
- */
-
-';
-
- $result;
+ cluck "ExtUtils::Constant::switch_clause is deprecated";
+ my $indent = shift;
+ my $comment = shift;
+ ExtUtils::Constant::XS->switch_clause({indent=>$indent, comment=>$comment},
+ @_);
}
-=item C_constant
-
-C_constant PACKAGE, SUBNAME, DEFAULT_TYPE, TYPES, INDENT, BREAKOUT, ITEM...
-
-A function that returns a B<list> of C subroutine definitions that return
-the value and type of constants when passed the name by the XS wrapper.
-I<ITEM...> gives a list of constant names. Each can either be a string,
-which is taken as a C macro name, or a reference to a hash with the following
-keys
-
-=over 8
-
-=item name
-
-The name of the constant, as seen by the perl code.
-
-=item type
-
-The type of the constant (I<IV>, I<NV> etc)
-
-=item value
-
-A C expression for the value of the constant, or a list of C expressions if
-the type is aggregate. This defaults to the I<name> if not given.
-
-=item macro
-
-The C pre-processor macro to use in the C<#ifdef>. This defaults to the
-I<name>, and is mainly used if I<value> is an C<enum>. If a reference an
-array is passed then the first element is used in place of the C<#ifdef>
-line, and the second element in place of the C<#endif>. This allows
-pre-processor constructions such as
-
- #if defined (foo)
- #if !defined (bar)
- ...
- #endif
- #endif
-
-to be used to determine if a constant is to be defined.
-
-A "macro" 1 signals that the constant is always defined, so the C<#if>/C<#endif>
-test is omitted.
-
-=item default
-
-Default value to use (instead of C<croak>ing with "your vendor has not
-defined...") to return if the macro isn't defined. Specify a reference to
-an array with type followed by value(s).
-
-=item pre
-
-C code to use before the assignment of the value of the constant. This allows
-you to use temporary variables to extract a value from part of a C<struct>
-and return this as I<value>. This C code is places at the start of a block,
-so you can declare variables in it.
-
-=item post
-
-C code to place between the assignment of value (to a temporary) and the
-return from the function. This allows you to clear up anything in I<pre>.
-Rarely needed.
-
-=item def_pre
-=item def_post
-
-Equivalents of I<pre> and I<post> for the default value.
-
-=back
-
-I<PACKAGE> is the name of the package, and is only used in comments inside the
-generated C code.
-
-The next 5 arguments can safely be given as C<undef>, and are mainly used
-for recursion. I<SUBNAME> defaults to C<constant> if undefined.
-
-I<DEFAULT_TYPE> is the type returned by C<ITEM>s that don't specify their
-type. In turn it defaults to I<IV>. I<TYPES> should be given either as a comma
-separated list of types that the C subroutine C<constant> will generate or as
-a reference to a hash. I<DEFAULT_TYPE> will be added to the list if not
-present, as will any types given in the list of I<ITEM>s. The resultant list
-should be the same list of types that C<XS_constant> is given. [Otherwise
-C<XS_constant> and C<C_constant> may differ in the number of parameters to the
-constant function. I<INDENT> is currently unused and ignored. In future it may
-be used to pass in information used to change the C indentation style used.]
-The best way to maintain consistency is to pass in a hash reference and let
-this function update it.
-
-I<BREAKOUT> governs when child functions of I<SUBNAME> are generated. If there
-are I<BREAKOUT> or more I<ITEM>s with the same length of name, then the code
-to switch between them is placed into a function named I<SUBNAME>_I<LEN>, for
-example C<constant_5> for names 5 characters long. The default I<BREAKOUT> is
-3. A single C<ITEM> is always inlined.
-
-=cut
-
-# The parameter now BREAKOUT was previously documented as:
-#
-# I<NAMELEN> if defined signals that all the I<name>s of the I<ITEM>s are of
-# this length, and that the constant name passed in by perl is checked and
-# also of this length. It is used during recursion, and should be C<undef>
-# unless the caller has checked all the lengths during code generation, and
-# the generated subroutine is only to be called with a name of this length.
-#
-# As you can see it now performs this function during recursion by being a
-# scalar reference.
-
sub C_constant {
my ($package, $subname, $default_type, $what, $indent, $breakout, @items)
= @_;
- $package ||= 'Foo';
- $subname ||= 'constant';
- # I'm not using this. But a hashref could be used for full formatting without
- # breaking this API
- # $indent ||= 0;
-
- my ($namelen, $items);
- if (ref $breakout) {
- # We are called recursively. We trust @items to be normalised, $what to
- # be a hashref, and pinch %$items from our parent to save recalculation.
- ($namelen, $items) = @$breakout;
- } else {
- $breakout ||= 3;
- $default_type ||= 'IV';
- if (!ref $what) {
- # Convert line of the form IV,UV,NV to hash
- $what = {map {$_ => 1} split /,\s*/, ($what || '')};
- # Figure out what types we're dealing with, and assign all unknowns to the
- # default type
- }
- foreach (@items) {
- my $name;
- if (ref $_) {
- my $orig = $_;
- # Make a copy which is a normalised version of the ref passed in.
- $name = $_->{name};
- my ($type, $macro, $value) = @$_{qw (type macro value)};
- $type ||= $default_type;
- $what->{$type} = 1;
- $_ = {name=>$name, type=>$type};
-
- undef $macro if defined $macro and $macro eq $name;
- $_->{macro} = $macro if defined $macro;
- undef $value if defined $value and $value eq $name;
- $_->{value} = $value if defined $value;
- foreach my $key (qw(default pre post def_pre def_post)) {
- my $value = $orig->{$key};
- $_->{$key} = $value if defined $value;
- # warn "$key $value";
- }
- } else {
- $name = $_;
- $_ = {name=>$_, type=>$default_type};
- $what->{$default_type} = 1;
- }
- warn "ExtUtils::Constant doesn't know how to handle values of type $_ used in macro $name" unless defined $XS_Constant{$_->{type}};
- if (exists $items->{$name}) {
- die "Multiple definitions for macro $name";
- }
- $items->{$name} = $_;
- }
- }
- my $params = params ($what);
-
- my ($body, @subs) = "static int\n$subname (pTHX_ const char *name";
- $body .= ", STRLEN len" unless defined $namelen;
- $body .= ", IV *iv_return" if $params->{IV};
- $body .= ", NV *nv_return" if $params->{NV};
- $body .= ", const char **pv_return" if $params->{PV};
- $body .= ", SV **sv_return" if $params->{SV};
- $body .= ") {\n";
-
- if (defined $namelen) {
- # We are a child subroutine. Print the simple description
- my $comment = 'When generated this function returned values for the list'
- . ' of names given here. However, subsequent manual editing may have'
- . ' added or removed some.';
- $body .= switch_clause (2, $comment, $namelen, $items, @items);
- } else {
- # We are the top level.
- $body .= " /* Initially switch on the length of the name. */\n";
- $body .= dump_names ($package, $subname, $default_type, $what, $indent,
- $breakout, @items);
- $body .= " switch (len) {\n";
- # Need to group names of the same length
- my @by_length;
- foreach (@items) {
- push @{$by_length[length $_->{name}]}, $_;
- }
- foreach my $i (0 .. $#by_length) {
- next unless $by_length[$i]; # None of this length
- $body .= " case $i:\n";
- if (@{$by_length[$i]} == 1) {
- my $thisone = $by_length[$i]->[0];
- my ($name, $value, $macro, $default, $pre, $post, $def_pre, $def_post)
- = @$thisone{qw (name value macro default pre post def_pre def_post)};
- $value = $name unless defined $value;
- $macro = $name unless defined $macro;
-
- $body .= memEQ_clause ($name);
- $body .= return_clause ($value, $thisone->{type}, undef, $macro,
- $default, $pre, $post, $def_pre, $def_post);
- $body .= " }\n";
- } elsif (@{$by_length[$i]} < $breakout) {
- $body .= switch_clause (4, '', $i, $items, @{$by_length[$i]});
- } else {
- # Only use the minimal set of parameters actually needed by the types
- # of the names of this length.
- my $what = {};
- foreach (@{$by_length[$i]}) {
- $what->{$_->{type}} = 1;
- }
- $params = params ($what);
- push @subs, C_constant ($package, "${subname}_$i", $default_type, $what,
- $indent, [$i, $items], @{$by_length[$i]});
- $body .= " return ${subname}_$i (aTHX_ name";
- $body .= ", iv_return" if $params->{IV};
- $body .= ", nv_return" if $params->{NV};
- $body .= ", pv_return" if $params->{PV};
- $body .= ", sv_return" if $params->{SV};
- $body .= ");\n";
- }
- $body .= " break;\n";
- }
- $body .= " }\n";
- }
- $body .= " return PERL_constant_NOTFOUND;\n}\n";
- return (@subs, $body);
+ ExtUtils::Constant::XS->C_constant({package => $package, subname => $subname,
+ default_type => $default_type,
+ types => $what, indent => $indent,
+ breakout => $breakout}, @items);
}
=item XS_constant PACKAGE, TYPES, SUBNAME, C_SUBNAME
the number of parameters passed to the C function C<constant>]
You can call the perl visible subroutine something other than C<constant> if
-you give the parameter I<SUBNAME>. The C subroutine it calls defaults to the
+you give the parameter I<SUBNAME>. The C subroutine it calls defaults to
the name of the perl visible subroutine, unless you give the parameter
I<C_SUBNAME>.
# Convert line of the form IV,UV,NV to hash
$what = {map {$_ => 1} split /,\s*/, ($what)};
}
- my $params = params ($what);
+ my $params = ExtUtils::Constant::XS->params ($what);
my $type;
my $xs = <<"EOT";
INPUT:
SV * sv;
const char * s = SvPV(sv, len);
+EOT
+ if ($params->{''}) {
+ $xs .= << 'EOT';
+ INPUT:
+ int utf8 = SvUTF8(sv);
+EOT
+ }
+ $xs .= << 'EOT';
PPCODE:
EOT
EOT
}
$xs .= " type = $C_subname(aTHX_ s, len";
+ $xs .= ', utf8' if $params->{''};
$xs .= ', &iv' if $params->{IV};
$xs .= ', &nv' if $params->{NV};
$xs .= ', &pv' if $params->{PV};
EOT
foreach $type (sort keys %XS_Constant) {
+ # '' marks utf8 flag needed.
+ next if $type eq '';
$xs .= "\t/* Uncomment this if you need to return ${type}s\n"
unless $what->{$type};
$xs .= " case PERL_constant_IS$type:\n";
}
+=item WriteMakefileSnippet
+
+WriteMakefileSnippet ATTRIBUTE =E<gt> VALUE [, ...]
+
+A function to generate perl code for Makefile.PL that will regenerate
+the constant subroutines. Parameters are named as passed to C<WriteConstants>,
+with the addition of C<INDENT> to specify the number of leading spaces
+(default 2).
+
+Currently only C<INDENT>, C<NAME>, C<DEFAULT_TYPE>, C<NAMES>, C<C_FILE> and
+C<XS_FILE> are recognised.
+
+=cut
+
+sub WriteMakefileSnippet {
+ my %args = @_;
+ my $indent = $args{INDENT} || 2;
+
+ my $result = <<"EOT";
+ExtUtils::Constant::WriteConstants(
+ NAME => '$args{NAME}',
+ NAMES => \\\@names,
+ DEFAULT_TYPE => '$args{DEFAULT_TYPE}',
+EOT
+ foreach (qw (C_FILE XS_FILE)) {
+ next unless exists $args{$_};
+ $result .= sprintf " %-12s => '%s',\n",
+ $_, $args{$_};
+ }
+ $result .= <<'EOT';
+ );
+EOT
+
+ $result =~ s/^/' 'x$indent/gem;
+ return ExtUtils::Constant::XS->dump_names({default_type=>$args{DEFAULT_TYPE},
+ indent=>$indent,},
+ @{$args{NAMES}})
+ . $result;
+}
+
=item WriteConstants ATTRIBUTE =E<gt> VALUE [, ...]
Writes a file of C code and a file of XS code which you should C<#include>
and C<INCLUDE> in the C and XS sections respectively of your module's XS
-code. You probaby want to do this in your C<Makefile.PL>, so that you can
+code. You probably want to do this in your C<Makefile.PL>, so that you can
easily edit the list of constants without touching the rest of your module.
The attributes supported are
=item C_FILE
The name of the file to write containing the C code. The default is
-C<constants.c>.
+C<const-c.inc>. The C<-> in the name ensures that the file can't be
+mistaken for anything related to a legitimate perl package name, and
+not naming the file C<.c> avoids having to override Makefile.PL's
+C<.xs> to C<.c> rules.
=item XS_FILE
The name of the file to write containing the XS code. The default is
-C<constants.xs>.
+C<const-xs.inc>.
=item SUBNAME
The perl visible name of the XS subroutine generated which will return the
-constants. The default is C<constant>.
+constants. The default is C<constant>.
=item C_SUBNAME
sub WriteConstants {
my %ARGS =
( # defaults
- C_FILE => 'constants.c',
- XS_FILE => 'constants.xs',
+ C_FILE => 'const-c.inc',
+ XS_FILE => 'const-xs.inc',
SUBNAME => 'constant',
DEFAULT_TYPE => 'IV',
@_);
print $c_fh constant_types(); # macro defs
print $c_fh "\n";
- # indent is still undef. Until anyone implents indent style rules with it.
- foreach (C_constant ($ARGS{NAME}, $ARGS{C_SUBNAME}, $ARGS{DEFAULT_TYPE},
- $types, undef, $ARGS{BREAKOUT_AT}, @{$ARGS{NAMES}})) {
+ # indent is still undef. Until anyone implements indent style rules with it.
+ foreach (ExtUtils::Constant::XS->C_constant({package => $ARGS{NAME},
+ subname => $ARGS{C_SUBNAME},
+ default_type =>
+ $ARGS{DEFAULT_TYPE},
+ types => $types,
+ breakout => $ARGS{BREAKOUT_AT}},
+ @{$ARGS{NAMES}})) {
print $c_fh $_, "\n"; # C constant subs
}
print $xs_fh XS_constant ($ARGS{NAME}, $types, $ARGS{XS_SUBNAME},
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