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BuildUtil.pm
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BuildUtil.pm
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# Copyright (C) 2001-2009, Parrot Foundation.
package Parrot::BuildUtil;
use strict;
use warnings;
=head1 NAME
Parrot::BuildUtil - Utilities for building Parrot
=head1 DESCRIPTION
This package holds pre-configure time subroutines, which are not exported
and should not require Parrot::Config.
Each must be requested by using a fully qualified name.
=head1 SUBROUTINES
=over 4
=item C<parrot_version()>
Determines the current version number for Parrot from the VERSION file
and returns it in a context-appropriate manner.
$parrot_version = Parrot::BuildUtil::parrot_version();
# $parrot_version is '0.4.11'
@parrot_version = Parrot::BuildUtil::parrot_version();
# @parrot_version is (0, 4, 11)
=cut
# cache for repeated calls
my ( $parrot_version, @parrot_version );
sub parrot_version {
if ( defined $parrot_version ) {
return wantarray ? @parrot_version : $parrot_version;
}
# Obtain the official version number from the VERSION file.
if (-e 'VERSION') {
open my $VERSION, '<', 'VERSION' or die 'Could not open VERSION file!';
chomp( $parrot_version = <$VERSION> );
close $VERSION or die $!;
}
else { # we're in an installed copy of Parrot
my $path = shift;
$path = '' unless $path;
open my $VERSION, '<', "$path/VERSION" or die 'Could not open VERSION file!';
chomp( $parrot_version = <$VERSION> );
close $VERSION or die $!;
}
$parrot_version =~ s/\s+//g;
@parrot_version = split( /\./, $parrot_version );
if ( scalar(@parrot_version) < 3 ) {
die "Too few components to VERSION file contents: '$parrot_version' (should be 3 or 4)!";
}
if ( scalar(@parrot_version) > 4 ) {
die "Too many components to VERSION file contents: '$parrot_version' (should be 3 or 4)!";
}
foreach my $component (@parrot_version) {
die "Illegal version component: '$component' in VERSION file!"
unless $component =~ m/^\d+$/;
}
$parrot_version = join( '.', @parrot_version );
return wantarray ? @parrot_version : $parrot_version;
}
=item C<slurp_file($filename)>
Slurps up the filename and returns the content as one string. While
doing so, it converts all DOS-style line endings to newlines.
=cut
sub slurp_file {
my ($file_name) = @_;
open( my $SLURP, '<', $file_name ) or die "open '$file_name': $!";
local $/ = undef;
my $file = <$SLURP> . '';
$file =~ s/\cM\cJ/\n/g;
close $SLURP or die $!;
return $file;
}
=item C<generated_file_header($filename, $style)>
Returns a comment to mark a generated file and detail how it was created.
C<$filename> is the name of the file on which the generated file is based,
C<$style> is the style of comment--C<'perl'> and C<'c'> are permitted, other
values produce an error.
=cut
sub generated_file_header {
my ( $filename, $style ) = @_;
die qq{unknown style "$style"}
if $style !~ m/\A(?:perl|c)\z/;
require File::Spec;
my $script = File::Spec->abs2rel($0);
$script =~ s/\\/\//g;
my $header = <<"END_HEADER";
/* ex: set ro ft=c:
* !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
*
* This file is generated automatically from '$filename'
* by $script.
*
* Any changes made here will be lost!
*
*/
END_HEADER
if ( $style eq 'perl' ) {
$header =~ s/^\/\*(.*?)ft=c:/# $1ft=perl:/;
$header =~ s/\n \*\n \*\///;
$header =~ s/^ \* ?/# /msg;
}
return $header;
}
=item C<get_bc_version()>
Return an array of ($bc_major, $bc_minor) from F<PBC_COMPAT>.
This is used in the native_pbc tests.
See also F<tools/dev/pbc_header.pl> and F<tools/build/pbcversion_h.pl>.
=cut
sub get_bc_version {
my $compat_file = 'PBC_COMPAT';
my ( $bc_major, $bc_minor );
open my $IN, '<', $compat_file or die "Can't read $compat_file";
while (<$IN>) {
if (/^(\d+)\.0*(\d+)/) {
( $bc_major, $bc_minor ) = ( $1, $2 );
last;
}
}
unless ( defined $bc_major ) {
die "No bytecode version found in '$compat_file'.";
}
close $IN;
return ( $bc_major, $bc_minor );
}
1;
=back
=cut
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4: