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###################################################
# utility functions to support pidl
# Copyright tridge@samba.org 2000
# released under the GNU GPL
package Parse::Pidl::Util;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(has_property property_matches ParseExpr ParseExprExt is_constant make_str unmake_str print_uuid MyDumper genpad parse_int parse_range);
use vars qw($VERSION);
$VERSION = '0.01';
use strict;
use warnings;
use Parse::Pidl::Expr;
use Parse::Pidl qw(error);
=head1 NAME
Parse::Pidl::Util - Generic utility functions for pidl
=head1 SYNOPSIS
use Parse::Pidl::Util;
=head1 DESCRIPTION
Simple module that contains a couple of trivial helper functions
used throughout the various pidl modules.
=head1 FUNCTIONS
=over 4
=cut
=item B<MyDumper>
a dumper wrapper to prevent dependence on the Data::Dumper module
unless we actually need it
=cut
sub MyDumper($)
{
require Data::Dumper;
$Data::Dumper::Sortkeys = 1;
my $s = shift;
return Data::Dumper::Dumper($s);
}
=item B<has_property>
see if a pidl property list contains a given property
=cut
sub has_property($$)
{
my($e, $p) = @_;
return undef if (not defined($e->{PROPERTIES}));
return $e->{PROPERTIES}->{$p};
}
=item B<property_matches>
see if a pidl property matches a value
=cut
sub property_matches($$$)
{
my($e,$p,$v) = @_;
if (!defined has_property($e, $p)) {
return undef;
}
if ($e->{PROPERTIES}->{$p} =~ /$v/) {
return 1;
}
return undef;
}
=item B<is_constant>
return 1 if the string is a C constant
=cut
sub is_constant($)
{
my $s = shift;
return 1 if ($s =~ /^\d+$/);
return 1 if ($s =~ /^0x[0-9A-Fa-f]+$/);
return 0;
}
=item B<make_str>
return a "" quoted string, unless already quoted
=cut
sub make_str($)
{
my $str = shift;
if (substr($str, 0, 1) eq "\"") {
return $str;
}
return "\"$str\"";
}
=item B<unmake_str>
unquote a "" quoted string
=cut
sub unmake_str($)
{
my $str = shift;
$str =~ s/^\"(.*)\"$/$1/;
return $str;
}
=item B<print_uuid>
Print C representation of a UUID.
=cut
sub print_uuid($)
{
my ($uuid) = @_;
$uuid =~ s/"//g;
my ($time_low,$time_mid,$time_hi,$clock_seq,$node) = split /-/, $uuid;
return undef if not defined($node);
my @clock_seq = $clock_seq =~ /(..)/g;
my @node = $node =~ /(..)/g;
return "{0x$time_low,0x$time_mid,0x$time_hi," .
"{".join(',', map {"0x$_"} @clock_seq)."}," .
"{".join(',', map {"0x$_"} @node)."}}";
}
=item B<ParseExpr>
Interpret an IDL expression, substituting particular variables.
=cut
sub ParseExpr($$$)
{
my($expr, $varlist, $e) = @_;
my $x = new Parse::Pidl::Expr();
return $x->Run($expr, sub { my $x = shift; error($e, $x); },
# Lookup fn
sub { my $x = shift;
return($varlist->{$x}) if (defined($varlist->{$x}));
return $x;
},
undef, undef);
}
=item B<ParseExprExt>
Interpret an IDL expression, substituting particular variables. Can call
callbacks when pointers are being dereferenced or variables are being used.
=cut
sub ParseExprExt($$$$$)
{
my($expr, $varlist, $e, $deref, $use) = @_;
my $x = new Parse::Pidl::Expr();
return $x->Run($expr, sub { my $x = shift; error($e, $x); },
# Lookup fn
sub { my $x = shift;
return($varlist->{$x}) if (defined($varlist->{$x}));
return $x;
},
$deref, $use);
}
=item B<genpad>
return an empty string consisting of tabs and spaces suitable for proper indent
of C-functions.
=cut
sub genpad($)
{
my ($s) = @_;
my $nt = int((length($s)+1)/8);
my $lt = ($nt*8)-1;
my $ns = (length($s)-$lt);
return "\t"x($nt)." "x($ns);
}
=item B<parse_int>
Try to convert hex and octal strings to numbers. If a string doesn't
look hexish or octish it will be left as is. If the unconverted string
is actually a decimal number, Perl is likely to handle it correctly.
=cut
sub parse_int {
my $s = shift;
if ($s =~ /^0[xX][0-9A-Fa-f]+$/) {
return hex $s;
}
if ($s =~ /^0[0-7]+$/) {
return oct $s;
}
return $s;
}
=item B<parse_range>
Read a range specification that might contain hex or octal numbers,
and work out what those numbers are.
=cut
sub parse_range {
my $range = shift;
my ($low, $high) = split(/,/, $range, 2);
$low = parse_int($low);
$high = parse_int($high);
return ($low, $high);
}
=back
=cut
1;
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