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inc/Devel/CheckLib.pm  view on Meta::CPAN

sub check_lib_or_exit {
    eval 'assert_lib(@_)';
    if($@) {
        warn $@;
        exit;
    }
}

sub check_lib {
    eval 'assert_lib(@_)';
    return $@ ? 0 : 1;
}

# borrowed from Text::ParseWords
sub _parse_line {
    my($delimiter, $keep, $line) = @_;
    my($word, @pieces);

    no warnings 'uninitialized';  # we will be testing undef strings

    while (length($line)) {
        # This pattern is optimised to be stack conservative on older perls.
        # Do not refactor without being careful and testing it on very long strings.
        # See Perl bug #42980 for an example of a stack busting input.
        $line =~ s/^
                    (?:
                        # double quoted string
                        (")                             # $quote
                        ((?>[^\\"]*(?:\\.[^\\"]*)*))"   # $quoted
        | # --OR--
                        # singe quoted string
                        (')                             # $quote
                        ((?>[^\\']*(?:\\.[^\\']*)*))'   # $quoted
                    |   # --OR--
                        # unquoted string
                        (                               # $unquoted
                            (?:\\.|[^\\"'])*?
                        )
                        # followed by
                        (                               # $delim
                            \Z(?!\n)                    # EOL
                        |   # --OR--
                            (?-x:$delimiter)            # delimiter
                        |   # --OR--
                            (?!^)(?=["'])               # a quote
                        )
        )//xs or return;    # extended layout
        my ($quote, $quoted, $unquoted, $delim) = (($1 ? ($1,$2) : ($3,$4)), $5, $6);

        return() unless( defined($quote) || length($unquoted) || length($delim));

        if ($keep) {
            $quoted = "$quote$quoted$quote";
        }
        else {
            $unquoted =~ s/\\(.)/$1/sg;
            if (defined $quote) {
                $quoted =~ s/\\(.)/$1/sg if ($quote eq '"');
            }
        }
        $word .= substr($line, 0, 0); # leave results tainted
        $word .= defined $quote ? $quoted : $unquoted;

        if (length($delim)) {
            push(@pieces, $word);
            push(@pieces, $delim) if ($keep eq 'delimiters');
            undef $word;
        }
        if (!length($line)) {
            push(@pieces, $word);
        }
    }
    return(@pieces);
}

sub assert_lib {
    my %args = @_;
    my (@libs, @libpaths, @headers, @incpaths);

    # FIXME: these four just SCREAM "refactor" at me
    @libs = (ref($args{lib}) ? @{$args{lib}} : $args{lib}) 
        if $args{lib};
    @libpaths = (ref($args{libpath}) ? @{$args{libpath}} : $args{libpath}) 
        if $args{libpath};
    @headers = (ref($args{header}) ? @{$args{header}} : $args{header}) 
        if $args{header};
    @incpaths = (ref($args{incpath}) ? @{$args{incpath}} : $args{incpath}) 
        if $args{incpath};
    my $analyze_binary = $args{analyze_binary};

    my @argv = @ARGV;
    push @argv, _parse_line('\s+', 0, $ENV{PERL_MM_OPT}||'');

    # work-a-like for Makefile.PL's LIBS and INC arguments
    # if given as command-line argument, append to %args
    for my $arg (@argv) {
        for my $mm_attr_key (qw(LIBS INC)) {
            if (my ($mm_attr_value) = $arg =~ /\A $mm_attr_key = (.*)/x) {
            # it is tempting to put some \s* into the expression, but the
            # MM command-line parser only accepts LIBS etc. followed by =,
            # so we should not be any more lenient with whitespace than that
                $args{$mm_attr_key} .= " $mm_attr_value";
            }
        }
    }

    # using special form of split to trim whitespace
    if(defined($args{LIBS})) {
        foreach my $arg (split(' ', $args{LIBS})) {
            die("LIBS argument badly-formed: $arg\n") unless($arg =~ /^-[lLR]/);
            push @{$arg =~ /^-l/ ? \@libs : \@libpaths}, substr($arg, 2);
        }
    }
    if(defined($args{INC})) {
        foreach my $arg (split(' ', $args{INC})) {
            die("INC argument badly-formed: $arg\n") unless($arg =~ /^-I/);
            push @incpaths, substr($arg, 2);
        }
    }

    my ($cc, $ld) = _findcc($args{debug}, $args{ccflags}, $args{ldflags});