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lib/Acme/JavaTrace.pm  view on Meta::CPAN

# _stack_trace()
# ------------
sub _stack_trace {
    my($file,$line) = @_;
    $file ||= '';  $line ||= '';
    $file =~ '(eval \d+)' and $file = '<eval>';
    
    my $level = 2;
    my @stack = ( ['', $file, $line] );  # @stack = ( [ function, file, line ], ... )
    
    while(my @context = caller($level++)) {
        $context[1] ||= '';  $context[2] ||= '';
        $context[1] =~ '(eval \d+)' and $context[1] = '<eval>' and $in_eval = 1;
        $context[3] eq '(eval)' and $context[3] = '<eval>' and $in_eval = 1;
        $stack[-1][0] = $context[3];
        push @stack, [ '', @context[1, 2] ];
    }
    $stack[-1][0] = (caller($level-2))[0].'::' || 'main::';
    
    for my $func (@stack) {
        $$func[1] eq '' and $$func[1] = 'unknown source';
        $$func[2] and $$func[1] .= ':';
        $stderr .= "\tat $$func[0]($$func[1]$$func[2])\n";
    }
}


1;

t/02hooks.t  view on Meta::CPAN

require Acme::JavaTrace;

# ... and check that the hooks are now pointing to some Perl code.
ok( ref $SIG{'__WARN__'}, 'CODE' );  #03
ok( ref $SIG{'__DIE__' }, 'CODE' );  #04


# Now check that Acme::JavaTrace is working as expected.
# For this, we define a few functions that call each others using 
# the differents mechanisms available in Perl. 
sub first_caller  { second_caller(@_) }
sub second_caller { third_caller(@_) }
sub third_caller  { goto &fourth_caller }
sub fourth_caller { eval "fifth_caller('$_[0]')"; die $@ if $@ }
sub fifth_caller  { eval "$_[0] 'hellooo nurse!!'"; die $@ if $@ }

# To intercept the messages, we redefine STDERR as a tie()ed object. 
my $stderr = '';
tie *STDERR, 'Acme::JavaTrace::Test';

# First we test warn().
$stderr = '';
first_caller('warn');
my $warn_msg = $stderr;

# Then we test die().
$stderr = '';
eval { first_caller('die') };
my $die_msg = $@;

# Now we check that what we got correspond to what we expected.
my($file) = $warn_msg =~ /\(([^<>]+?):\d+\)/;
my $errmsg = <<"ERRMSG";
hellooo nurse!!
	at <eval>(<eval>:1)
	at main::fifth_caller(${file}:27)
	at <eval>(<eval>:1)
	at main::fourth_caller(${file}:26)
	at main::second_caller(${file}:24)
	at main::first_caller(${file}:23)
	at main::(${file}:35)
ERRMSG

ok( $warn_msg, $errmsg );  #05

$errmsg = <<"ERRMSG";
hellooo nurse!!
	at <eval>(<eval>:1)
	at main::fifth_caller(${file}:27)
	at <eval>(<eval>:1)
	at main::fourth_caller(${file}:26)
	at main::second_caller(${file}:24)
	at main::first_caller(${file}:23)
	at <eval>(${file}:40)
	at main::(${file}:40)
ERRMSG

ok( $die_msg, $errmsg );  #06


package Acme::JavaTrace::Test;
sub TIEHANDLE {
    return bless {}, shift