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Revision 96 - (show annotations) (download)
Fri Mar 2 13:10:43 2007 UTC (7 years, 6 months ago) by nigel
File size: 4812 byte(s)
 r6896@hex:  nm | 2007-03-02 13:09:14 +0000
 Added EOL and keywork properties throughout

1 #! /usr/bin/perl
2
3 # Program for testing regular expressions with perl to check that PCRE handles
4 # them the same. This is the version that supports /8 for UTF-8 testing. As it
5 # stands, it requires at least Perl 5.8 for UTF-8 support. However, it needs to
6 # have "use utf8" at the start for running the UTF-8 tests, but *not* for the
7 # other tests. The only way I've found for doing this is to cat this line in
8 # explicitly in the RunPerlTest script.
9
10 # use locale; # With this included, \x0b matches \s!
11
12 # Function for turning a string into a string of printing chars. There are
13 # currently problems with UTF-8 strings; this fudges round them.
14
15 sub pchars {
16 my($t) = "";
17
18 if ($utf8)
19 {
20 @p = unpack('U*', $_[0]);
21 foreach $c (@p)
22 {
23 if ($c >= 32 && $c < 127) { $t .= chr $c; }
24 else { $t .= sprintf("\\x{%02x}", $c); }
25 }
26 }
27
28 else
29 {
30 foreach $c (split(//, $_[0]))
31 {
32 if (ord $c >= 32 && ord $c < 127) { $t .= $c; }
33 else { $t .= sprintf("\\x%02x", ord $c); }
34 }
35 }
36
37 $t;
38 }
39
40
41 # Read lines from named file or stdin and write to named file or stdout; lines
42 # consist of a regular expression, in delimiters and optionally followed by
43 # options, followed by a set of test data, terminated by an empty line.
44
45 # Sort out the input and output files
46
47 if (@ARGV > 0)
48 {
49 open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n";
50 $infile = "INFILE";
51 }
52 else { $infile = "STDIN"; }
53
54 if (@ARGV > 1)
55 {
56 open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n";
57 $outfile = "OUTFILE";
58 }
59 else { $outfile = "STDOUT"; }
60
61 printf($outfile "Perl $] Regular Expressions\n\n");
62
63 # Main loop
64
65 NEXT_RE:
66 for (;;)
67 {
68 printf " re> " if $infile eq "STDIN";
69 last if ! ($_ = <$infile>);
70 printf $outfile "$_" if $infile ne "STDIN";
71 next if ($_ eq "");
72
73 $pattern = $_;
74
75 while ($pattern !~ /^\s*(.).*\1/s)
76 {
77 printf " > " if $infile eq "STDIN";
78 last if ! ($_ = <$infile>);
79 printf $outfile "$_" if $infile ne "STDIN";
80 $pattern .= $_;
81 }
82
83 chomp($pattern);
84 $pattern =~ s/\s+$//;
85
86 # The private /+ modifier means "print $' afterwards".
87
88 $showrest = ($pattern =~ s/\+(?=[a-z]*$)//);
89
90 # Remove /8 from a UTF-8 pattern.
91
92 $utf8 = $pattern =~ s/8(?=[a-z]*$)//;
93
94 # Check that the pattern is valid
95
96 eval "\$_ =~ ${pattern}";
97 if ($@)
98 {
99 printf $outfile "Error: $@";
100 next NEXT_RE;
101 }
102
103 # If the /g modifier is present, we want to put a loop round the matching;
104 # otherwise just a single "if".
105
106 $cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
107
108 # If the pattern is actually the null string, Perl uses the most recently
109 # executed (and successfully compiled) regex is used instead. This is a
110 # nasty trap for the unwary! The PCRE test suite does contain null strings
111 # in places - if they are allowed through here all sorts of weird and
112 # unexpected effects happen. To avoid this, we replace such patterns with
113 # a non-null pattern that has the same effect.
114
115 $pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
116
117 # Read data lines and test them
118
119 for (;;)
120 {
121 printf "data> " if $infile eq "STDIN";
122 last NEXT_RE if ! ($_ = <$infile>);
123 chomp;
124 printf $outfile "$_\n" if $infile ne "STDIN";
125
126 s/\s+$//;
127 s/^\s+//;
128
129 last if ($_ eq "");
130 $x = eval "\"$_\""; # To get escapes processed
131
132 # Empty array for holding results, then do the matching.
133
134 @subs = ();
135
136 $pushes = "push \@subs,\$&;" .
137 "push \@subs,\$1;" .
138 "push \@subs,\$2;" .
139 "push \@subs,\$3;" .
140 "push \@subs,\$4;" .
141 "push \@subs,\$5;" .
142 "push \@subs,\$6;" .
143 "push \@subs,\$7;" .
144 "push \@subs,\$8;" .
145 "push \@subs,\$9;" .
146 "push \@subs,\$10;" .
147 "push \@subs,\$11;" .
148 "push \@subs,\$12;" .
149 "push \@subs,\$13;" .
150 "push \@subs,\$14;" .
151 "push \@subs,\$15;" .
152 "push \@subs,\$16;" .
153 "push \@subs,\$'; }";
154
155 eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
156
157 if ($@)
158 {
159 printf $outfile "Error: $@\n";
160 next NEXT_RE;
161 }
162 elsif (scalar(@subs) == 0)
163 {
164 printf $outfile "No match\n";
165 }
166 else
167 {
168 while (scalar(@subs) != 0)
169 {
170 printf $outfile (" 0: %s\n", &pchars($subs[0]));
171 printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
172 $last_printed = 0;
173 for ($i = 1; $i <= 16; $i++)
174 {
175 if (defined $subs[$i])
176 {
177 while ($last_printed++ < $i-1)
178 { printf $outfile ("%2d: <unset>\n", $last_printed); }
179 printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
180 $last_printed = $i;
181 }
182 }
183 splice(@subs, 0, 18);
184 }
185 }
186 }
187 }
188
189 # printf $outfile "\n";
190
191 # End

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