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package Debug::Xray;
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2
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1
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1
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61587
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use strict;
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1
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2
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1
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41
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3
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1
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1
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6
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use warnings;
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1
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2
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1
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32
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4
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5
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1
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1
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5
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use feature qw(state);
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1
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5
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1
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89
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6
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7
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1
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1
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4
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use Exporter qw(import);
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1
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2
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1
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71
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8
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9
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our $VERSION = 0.05;
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10
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our @ISA = qw(Exporter);
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11
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our @EXPORT_OK;
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12
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13
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1
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1
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382
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no Carp::Assert;
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0
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0
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14
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use Hook::LexWrap;
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15
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use Data::Dumper;
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16
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use PPI;
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17
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use PadWalker qw(var_name);
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18
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use Debug::Xray::WatchScalar qw( set_log_handler TIESCALAR STORE FETCH );
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19
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20
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21
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# TODO Oranize subs into EXPORT_TAGS
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22
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# CONFIGURATION
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23
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push @EXPORT_OK, qw{
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24
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&set_debug_verbose
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25
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&set_debug_quiet
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26
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&watch_subs
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27
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&watch_all_subs
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28
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};
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29
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30
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31
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# TRACK SUBROUTINE EXECUTION
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32
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push @EXPORT_OK, qw{
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33
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&start_sub
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34
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&end_sub
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35
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&dprint
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36
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};
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37
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38
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# WATCH VARIABLE ROUTINES
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39
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push @EXPORT_OK, qw{
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40
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&add_watch_var
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41
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};
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42
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43
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# TESTING OF THIS MODULE
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44
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push @EXPORT_OK, qw{
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45
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&is_carp_debug
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46
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};
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47
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48
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# WARNING AND ERROR HANDLING
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49
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push @EXPORT_OK, qw{
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50
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&debug_warn_handling
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51
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&default_warn_handling
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52
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&debug_error_handling
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53
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&default_error_handling
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54
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};
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55
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56
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57
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my $Verbose = 1;
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58
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my $SUB_NEST_LIMIT = 200;
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59
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60
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my $LogFile = '/home/dave/Desktop/Jobs/computer_exercises/perl/debug/Debug.log';
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61
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62
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my $VOID_CONTEXT_ERROR_MESSAGE = 'The caller of this function must assign the return value. ' .
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63
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'The hooks remain in effect only when the returned value is in lexical scope.';
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64
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65
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my @SubStack;
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66
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67
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Debug::Xray::WatchScalar->set_log_handler(\&dprint);
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68
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69
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sub set_debug_verbose { $Verbose = 1 };
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70
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sub set_debug_quiet { $Verbose = 0 };
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71
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sub is_verbose { return $Verbose };
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72
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sub is_carp_debug {
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73
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return 1 if DEBUG;
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74
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return 0;
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75
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}
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76
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77
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78
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# MESSAGE PRINT ROUTINES
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79
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80
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sub dprint($) {
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81
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return unless $Verbose;
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82
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83
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my ($mesg) = shift;
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84
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my $print_line = _indentation() . $mesg;
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85
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86
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print "$print_line\n";
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87
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88
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_log_to_file($print_line) if $LogFile;
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89
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return $print_line;
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90
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}
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91
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92
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93
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sub _log_to_file {
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94
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assert ( $#_==0, 'Parms' ) if DEBUG;
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95
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state $HLog;
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96
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97
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unless ($HLog) {open ( $HLog, ">$LogFile" ) or die "Could not open log file $LogFile: $!"};
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98
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99
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my $print_line = shift;
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100
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print $HLog "$print_line\n";
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101
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}
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102
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103
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104
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105
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sub debug_warn_handling {
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106
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$SIG{__WARN__} = sub { &_warn_handler(@_); };
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107
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108
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}
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109
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sub default_warn_handling {
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110
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$SIG{__WARN__} = 'DEFAULT';
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111
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}
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112
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113
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114
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sub debug_error_handling {
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115
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$SIG{__DIE__} = sub { &_error_handler(@_); };
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116
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}
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117
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sub default_error_handling {
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118
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$SIG{__DIE__} = 'DEFAULT';
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119
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}
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120
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121
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# TODO Call Stack for error handlers
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122
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sub _warn_handler {
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123
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my @msgs = @_;
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124
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125
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for my $msg (@msgs) {
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126
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dprint ("Warning: $msg");
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127
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}
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128
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#return @_;
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129
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}
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130
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131
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sub _error_handler {
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132
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my @msgs = @_;
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133
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for my $msg (@msgs) {
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134
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dprint ("Error: $msg");
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135
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}
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136
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#return @_;
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137
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}
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138
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139
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140
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141
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142
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sub start_sub {
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143
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return unless $Verbose;
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144
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145
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my $msg = shift || (caller(1))[3];
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146
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assert ( $#SubStack < $SUB_NEST_LIMIT, "Too many subs on stack " . Dumper \@SubStack) if DEBUG;
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147
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assert ( defined $msg ) if DEBUG;
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148
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149
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dprint "SUB: $msg";
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150
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push @SubStack, $msg;
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151
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}
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152
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153
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154
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sub end_sub {
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155
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return unless $Verbose;
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156
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157
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my $msg = shift || (caller(1))[3];
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158
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assert ( $msg !~ m/start_sub/) if DEBUG;
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159
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assert ( $msg !~ m/end_sub/) if DEBUG;
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160
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assert ( $SubStack[$#SubStack] eq $msg,
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161
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"Stack of size $#SubStack out of synch. Popping $SubStack[$#SubStack], expected $msg\nStack is " .
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162
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Dumper (\@SubStack) . "\n" ) if DEBUG;
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163
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164
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pop @SubStack;
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165
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166
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dprint "END: $msg";
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167
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}
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168
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169
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170
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sub _indentation() {
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171
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return " " x ($#SubStack+1);
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172
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}
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173
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174
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175
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176
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# SUBROUTINE HOOK ROUTINES
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177
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178
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sub watch_subs { # NOTE: Hooks stay in effect within the lexical scope of the return value
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179
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assert ( defined wantarray, $VOID_CONTEXT_ERROR_MESSAGE ) if DEBUG;
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180
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181
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my @sub_names = @_;
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182
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183
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my $hooks;
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184
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for my $sub_name (@sub_names) {
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185
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push @$hooks, wrap $sub_name,
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186
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pre => sub { start_sub ($sub_name) },
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187
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post => sub { end_sub ($sub_name) };
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188
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}
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189
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190
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return $hooks;
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191
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}
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192
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193
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194
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sub watch_all_subs { # NOTE: Hooks stay in effect within the lexical scope of the return value
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195
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assert ( defined wantarray, $VOID_CONTEXT_ERROR_MESSAGE ) if DEBUG;
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196
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197
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my @caller = caller();
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198
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my $Document = PPI::Document->new("$caller[1]");
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199
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my $sub_nodes = $Document->find(
|
200
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sub { $_[1]->isa('PPI::Statement::Sub') }
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201
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);
|
202
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203
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my @sub_names;
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204
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for my $sub_node (@$sub_nodes) {
|
205
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next if $sub_node->name eq 'BEGIN';
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206
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push @sub_names, $caller[0].'::'.$sub_node->name;
|
207
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}
|
208
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209
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return watch_subs(@sub_names);
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210
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}
|
211
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212
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213
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sub add_watch_var {
|
214
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assert ( $#_==0, 'Parms' ) if DEBUG;
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215
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my $var_ref = shift;
|
216
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my $var_name = var_name(1, $var_ref);
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217
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assert ( $var_name, "var_name has a value: $var_name]" ) if DEBUG;
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218
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219
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if ($var_name =~ /^\$/) {
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220
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tie $$var_ref, 'Debug::Xray::WatchScalar', $var_name, $$var_ref;
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221
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}
|
222
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elsif ($var_name =~ /^\@/) { die 'Not implemented yet' }
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223
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elsif ($var_name =~ /^\%/) { die 'Not implemented yet' }
|
224
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|
|
else { die "Invalid variable name '$var_name'" if DEBUG }
|
225
|
|
|
|
|
|
|
|
226
|
|
|
|
|
|
|
return $var_name if DEBUG;
|
227
|
|
|
|
|
|
|
}
|
228
|
|
|
|
|
|
|
|
229
|
|
|
|
|
|
|
|
230
|
|
|
|
|
|
|
__END__
|