1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
#! /usr/bin/perl
# Program for testing regular expressions with perl to check that PCRE handles
# them the same.
# Function for turning a string into a string of printing chars
sub pchars {
my($t) = "";
foreach $c (split(//, @_[0]))
{
if (ord $c >= 32 && ord $c < 127) { $t .= $c; }
else { $t .= sprintf("\\x%02x", ord $c); }
}
$t;
}
# Read lines from named file or stdin and write to named file or stdout; lines
# consist of a regular expression, in delimiters and optionally followed by
# options, followed by a set of test data, terminated by an empty line.
# Sort out the input and output files
if (@ARGV > 0)
{
open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n";
$infile = "INFILE";
}
else { $infile = "STDIN"; }
if (@ARGV > 1)
{
open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n";
$outfile = "OUTFILE";
}
else { $outfile = "STDOUT"; }
printf($outfile "Perl Regular Expressions\n\n");
# Main loop
NEXT_RE:
for (;;)
{
printf " re> " if $infile eq "STDIN";
last if ! ($_ = <$infile>);
printf $outfile "$_" if $infile ne "STDIN";
next if ($_ eq "");
$pattern = $_;
$delimiter = substr($_, 0, 1);
while ($pattern !~ /^\s*(.).*\1/s)
{
printf " > " if $infile eq "STDIN";
last if ! ($_ = <$infile>);
printf $outfile "$_" if $infile ne "STDIN";
$pattern .= $_;
}
chomp($pattern);
$pattern =~ s/\s+$//;
# Check that the pattern is valid
eval "\$_ =~ ${pattern}";
if ($@)
{
printf $outfile "Error: $@\n";
next NEXT_RE;
}
# Read data lines and test them
for (;;)
{
printf "data> " if $infile eq "STDIN";
last NEXT_RE if ! ($_ = <$infile>);
chomp;
printf $outfile "$_\n" if $infile ne "STDIN";
s/\s+$//;
s/^\s+//;
last if ($_ eq "");
$_ = eval "\"$_\""; # To get escapes processed
$ok = 0;
eval "if (\$_ =~ ${pattern}) {" .
"\$z = \$&;" .
"\$a = \$1;" .
"\$b = \$2;" .
"\$c = \$3;" .
"\$d = \$4;" .
"\$e = \$5;" .
"\$f = \$6;" .
"\$g = \$7;" .
"\$h = \$8;" .
"\$i = \$9;" .
"\$j = \$10;" .
"\$k = \$11;" .
"\$l = \$12;" .
"\$m = \$13;" .
"\$n = \$14;" .
"\$o = \$15;" .
"\$p = \$16;" .
"\$ok = 1; }";
if ($@)
{
printf $outfile "Error: $@\n";
next NEXT_RE;
}
elsif (!$ok)
{
printf $outfile "No match\n";
}
else
{
@subs = ($z,$a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l,$m,$n,$o,$p);
$last_printed = 0;
for ($i = 0; $i <= 17; $i++)
{
if ($i == 0 || defined $subs[$i])
{
while ($last_printed++ < $i-1)
{ printf $outfile ("%2d: <unset>\n", $last_printed); }
printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
$last_printed = $i;
}
}
}
}
}
printf $outfile "\n";
# End
|
