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H2inc.pm
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H2inc.pm
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package Parrot::H2inc;
# Copyright (C) 2010, Parrot Foundation.
use strict;
use warnings;
use Exporter;
our @ISA = qw( Exporter );
our @EXPORT_OK = qw(
parse_file
perform_directive
generate_text
print_generated_file
);
=head1 NAME
Parrot::H2inc - Subroutines used in F<tools/build/h2inc.pl>
=head1 DESCRIPTION
This package exports on demand only four subroutines used in
F<tools/build/h2inc.pl>.
=head1 SUBROUTINES
=head2 C<parse_file()>
=over 4
=item * Arguments
$directive = parse_file($in_file, $out_file);
List of 2 elements: string holding name of incoming file; string holding name of outgoing file.
=item * Return Value
If successful, returns a hash reference.
=back
=cut
sub parse_file {
my ( $in_file, $out_file) = @_;
$out_file =~ s{\\}{/}g; # transform Windows backslash
my ( %values, $last_val, $cur, $or_continues );
open my $fh, '<', $in_file or die "Can't open $in_file: $!\n";
while ( my $line = <$fh> ) {
if (
$line =~ m{
&gen_from_(enum|def) \( ( [^)]* ) \)
(?: \s+ prefix \( (\w+) \) )?
(?: \s+ subst \( (s/.*?/.*?/[eig]?) \) )?
}x
)
{
$cur and die "Missing '&end_gen' in $in_file\n";
my $file;
foreach (split ' ', $2) {
$file = $_ if $out_file =~ /$_$/;
}
$cur = {
type => $1,
file => $file,
prefix => defined $3 ? $3 : '',
defined $4 ? ( subst => $4 ) : (),
};
$last_val = -1;
}
elsif ( $line =~ /&end_gen\b/ ) {
$cur or die "Missing &gen_from_(enum|def) in $in_file\n";
return $cur if defined $cur->{file};
$cur = undef;
}
$cur or next;
if ( $cur->{type} eq 'def' && $line =~ /^\s*#define\s+(\w+)\s+(-?\w+|"[^"]*")/ ) {
push @{ $cur->{defs} }, [ $1, $2 ];
}
elsif ( $cur->{type} eq 'enum' ) {
# Special case: enum value is or'd combination of other values
if ( $or_continues ) {
$or_continues = 0;
my $last_def = $cur->{defs}->[-1];
my ($k, $v) = @{$last_def};
my @or_values = grep {defined $_} $line =~ /^\s*(-?\w+)(?:\s*\|\s*(-?\w+))*/;
for my $or (@or_values) {
if ( defined $values{$or} ) {
$v |= $values{$or};
}
elsif ( $or =~ /^0/ ) {
$v |= oct $or;
}
}
if ($line =~ /\|\s*$/) {
$or_continues = 1;
}
$values{$k} = $last_val = $v;
$cur->{defs}->[-1]->[1] = $v;
}
elsif ( $line =~ /^\s*(\w+)\s*=\s*(-?\w+)\s*\|/ ) {
my ( $k, $v ) = ( $1, $2 );
my @or_values = ($v, $line =~ /\|\s*(-?\w+)/g);
$v = 0;
for my $or (@or_values) {
if ( defined $values{$or} ) {
$v |= $values{$or};
}
elsif ( $or =~ /^0/ ) {
$v |= oct $or;
}
}
if ($line =~ /\|\s*$/) {
$or_continues = 1;
}
$values{$k} = $last_val = $v;
push @{ $cur->{defs} }, [ $k, $v ];
}
elsif ( $line =~ /^\s*(\w+)\s*=\s*(-?\w+)/ ) {
my ( $k, $v ) = ( $1, $2 );
if ( defined $values{$v} ) {
$v = $values{$v};
}
elsif ( $v =~ /^0/ ) {
$v = oct $v;
}
$values{$k} = $last_val = $v;
push @{ $cur->{defs} }, [ $k, $v ];
}
elsif ( $line =~ m{^\s*(\w+)\s*(?:,\s*)?(?:/\*|$)} ) {
my $k = $1;
my $v = $values{$k} = ++$last_val;
push @{ $cur->{defs} }, [ $k, $v ];
}
}
}
close $fh or die "Could not close handle to $in_file after reading: $!";
$cur and die "Missing '&end_gen' in $in_file\n";
return;
}
=head2 C<perform_directive()>
=over 4
=item * Arguments
$defs_ref = perform_directive($directive);
Single hash reference (which is the return value from a successful run of
C<parse_file()>.
=item * Return Value
Array reference.
=back
=cut
sub perform_directive {
my ($d) = @_;
my @defs = prepend_prefix( $d->{prefix}, @{ $d->{defs} } );
if ( my $subst = $d->{subst} ) {
@defs = transform_name( sub { local $_ = shift; eval $subst; $_ }, @defs );
}
return \@defs;
}
=head2 C<const_to_parrot()>
=over 4
=item * Arguments
$gen = join "\n", const_to_parrot(@defs);
List.
=item * Return Value
String.
=back
=cut
sub const_to_parrot {
my $keylen = (sort { $a <=> $b } map { length($_->[0]) } @_ )[-1] ;
my $vallen = (sort { $a <=> $b } map { length($_->[1]) } @_ )[-1] ;
return map {sprintf ".macro_const %-${keylen}s %${vallen}s", $_->[0], $_->[1]} @_;
}
=head2 C<const_to_perl()>
=over 4
=item * Arguments
$gen = join "\n", const_to_perl(@defs);
List.
=item * Return Value
String.
=back
=cut
sub const_to_perl {
my $keylen = (sort { $a <=> $b } map { length($_->[0]) } @_ )[-1] ;
return map {sprintf "use constant %-${keylen}s => %s;", $_->[0], $_->[1]} @_;
}
=head2 C<transform_name()>
=over 4
=item * Arguments
transform_name( sub { $prefix . $_[0] }, @_ );
List of two or more elements, the first element of which is a subroutine
reference.
=item * Return Value
List which is a mapping of the transformations executed by the first argument
upon the remaining arguments.
=back
=cut
sub transform_name {
my $action = shift;
return map { [ $action->( $_->[0] ), $_->[1] ] } @_;
}
=head2 C<prepend_prefix()>
=over 4
=item * Arguments
@defs = prepend_prefix $d->{prefix}, @{ $d->{defs} };
List of two or more elements, the first element of which is a string.
=item * Return Value
List.
=back
=cut
sub prepend_prefix {
my $prefix = shift;
return transform_name( sub { $prefix . $_[0] }, @_ );
}
=head2 C<generate_text()>
=over 4
=item * Argument
$generated_text = generate_text($directive, \@defs);
List of two arguments: Directive hashref; reference to array of definitions.
=item * Return Value
String holding main text to be printed to new file.
=back
=cut
sub generate_text {
my ($directive, $defs_ref) = @_;
my $target = $directive->{file};
my $generated_text;
if ($target =~ /\.pm$/) {
$generated_text = join "\n", const_to_perl(@{ $defs_ref });
$generated_text .= "\n1;";
}
else {
$generated_text = join "\n", const_to_parrot(@{ $defs_ref });
}
return $generated_text;
}
=head2 C<print_generated_file()>
=over 4
=item * Argument
print_generated_file( {
in => $in_file,
out => $out_file,
script => $0,
gen => $generated_text,
} );
Hash reference. Elements pertain to file being read, file being created,
calling program (typically, F<tools/build/h2inc.pl>) and string of text to be
printed to file.
=item * Return Value
Implicitly returns true upon success.
=back
=cut
sub print_generated_file {
my $args = shift;
open my $out_fh, '>', $args->{out} or die "Can't open $args->{out}: $!\n";
print {$out_fh} <<"EOF";
# DO NOT EDIT THIS FILE.
#
# This file is generated automatically from
# $args->{in} by $args->{script}
#
# Any changes made here will be lost.
#
$args->{gen}
EOF
close $out_fh;
return;
}
1;
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4: