/[pcre]/code/tags/pcre-4.5/perltest
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Contents of /code/tags/pcre-4.5/perltest

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Revision 49 - (show annotations) (download)
Sat Feb 24 21:39:33 2007 UTC (7 years, 6 months ago) by nigel
Original Path: code/trunk/perltest
File size: 4131 byte(s)
Load pcre-3.3 into code/trunk.

1 #! /usr/bin/perl
2
3 # Program for testing regular expressions with perl to check that PCRE handles
4 # them the same.
5
6
7 # Function for turning a string into a string of printing chars
8
9 sub pchars {
10 my($t) = "";
11
12 foreach $c (split(//, $_[0]))
13 {
14 if (ord $c >= 32 && ord $c < 127) { $t .= $c; }
15 else { $t .= sprintf("\\x%02x", ord $c); }
16 }
17 $t;
18 }
19
20
21
22 # Read lines from named file or stdin and write to named file or stdout; lines
23 # consist of a regular expression, in delimiters and optionally followed by
24 # options, followed by a set of test data, terminated by an empty line.
25
26 # Sort out the input and output files
27
28 if (@ARGV > 0)
29 {
30 open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n";
31 $infile = "INFILE";
32 }
33 else { $infile = "STDIN"; }
34
35 if (@ARGV > 1)
36 {
37 open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n";
38 $outfile = "OUTFILE";
39 }
40 else { $outfile = "STDOUT"; }
41
42 printf($outfile "Perl $] Regular Expressions\n\n");
43
44 # Main loop
45
46 NEXT_RE:
47 for (;;)
48 {
49 printf " re> " if $infile eq "STDIN";
50 last if ! ($_ = <$infile>);
51 printf $outfile "$_" if $infile ne "STDIN";
52 next if ($_ eq "");
53
54 $pattern = $_;
55
56 while ($pattern !~ /^\s*(.).*\1/s)
57 {
58 printf " > " if $infile eq "STDIN";
59 last if ! ($_ = <$infile>);
60 printf $outfile "$_" if $infile ne "STDIN";
61 $pattern .= $_;
62 }
63
64 chomp($pattern);
65 $pattern =~ s/\s+$//;
66
67 # The private /+ modifier means "print $' afterwards". We use it
68 # only on the end of patterns to make it easy to chop off here.
69
70 $showrest = ($pattern =~ s/\+(?=[a-z]*$)//);
71
72 # Check that the pattern is valid
73
74 eval "\$_ =~ ${pattern}";
75 if ($@)
76 {
77 printf $outfile "Error: $@";
78 next NEXT_RE;
79 }
80
81 # If the /g modifier is present, we want to put a loop round the matching;
82 # otherwise just a single "if".
83
84 $cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
85
86 # If the pattern is actually the null string, Perl uses the most recently
87 # executed (and successfully compiled) regex is used instead. This is a
88 # nasty trap for the unwary! The PCRE test suite does contain null strings
89 # in places - if they are allowed through here all sorts of weird and
90 # unexpected effects happen. To avoid this, we replace such patterns with
91 # a non-null pattern that has the same effect.
92
93 $pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
94
95 # Read data lines and test them
96
97 for (;;)
98 {
99 printf "data> " if $infile eq "STDIN";
100 last NEXT_RE if ! ($_ = <$infile>);
101 chomp;
102 printf $outfile "$_\n" if $infile ne "STDIN";
103
104 s/\s+$//;
105 s/^\s+//;
106
107 last if ($_ eq "");
108
109 $x = eval "\"$_\""; # To get escapes processed
110
111 # Empty array for holding results, then do the matching.
112
113 @subs = ();
114
115 eval "${cmd} (\$x =~ ${pattern}) {" .
116 "push \@subs,\$&;" .
117 "push \@subs,\$1;" .
118 "push \@subs,\$2;" .
119 "push \@subs,\$3;" .
120 "push \@subs,\$4;" .
121 "push \@subs,\$5;" .
122 "push \@subs,\$6;" .
123 "push \@subs,\$7;" .
124 "push \@subs,\$8;" .
125 "push \@subs,\$9;" .
126 "push \@subs,\$10;" .
127 "push \@subs,\$11;" .
128 "push \@subs,\$12;" .
129 "push \@subs,\$13;" .
130 "push \@subs,\$14;" .
131 "push \@subs,\$15;" .
132 "push \@subs,\$16;" .
133 "push \@subs,\$'; }";
134
135 if ($@)
136 {
137 printf $outfile "Error: $@\n";
138 next NEXT_RE;
139 }
140 elsif (scalar(@subs) == 0)
141 {
142 printf $outfile "No match\n";
143 }
144 else
145 {
146 while (scalar(@subs) != 0)
147 {
148 printf $outfile (" 0: %s\n", &pchars($subs[0]));
149 printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
150 $last_printed = 0;
151 for ($i = 1; $i <= 16; $i++)
152 {
153 if (defined $subs[$i])
154 {
155 while ($last_printed++ < $i-1)
156 { printf $outfile ("%2d: <unset>\n", $last_printed); }
157 printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
158 $last_printed = $i;
159 }
160 }
161 splice(@subs, 0, 18);
162 }
163 }
164 }
165 }
166
167 printf $outfile "\n";
168
169 # End

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