/[pcre]/code/trunk/perltest.pl
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Contents of /code/trunk/perltest.pl

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Revision 459 - (hide annotations) (download)
Sun Oct 4 09:21:39 2009 UTC (4 years, 10 months ago) by ph10
File MIME type: text/plain
File size: 4907 byte(s)
Fix problems with conditional references to duplicate named subpatterns.

1 ph10 97 #! /usr/bin/env perl
2 nigel 3
3     # Program for testing regular expressions with perl to check that PCRE handles
4 nigel 63 # them the same. This is the version that supports /8 for UTF-8 testing. As it
5 nigel 91 # 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 nigel 3
10 nigel 91 # use locale; # With this included, \x0b matches \s!
11 nigel 3
12 nigel 63 # 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 nigel 3
15     sub pchars {
16     my($t) = "";
17    
18 nigel 63 if ($utf8)
19 nigel 3 {
20 nigel 63 @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 nigel 3 }
27 nigel 63
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 nigel 3 $t;
38     }
39    
40    
41     # Read lines from named file or stdin and write to named file or stdout; lines
42     # consist of a regular expression, in delimiters and optionally followed by
43     # options, followed by a set of test data, terminated by an empty line.
44    
45     # Sort out the input and output files
46    
47     if (@ARGV > 0)
48     {
49     open(INFILE, "<$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 { $outfile = "STDOUT"; }
60    
61 nigel 23 printf($outfile "Perl $] Regular Expressions\n\n");
62 nigel 3
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 nigel 63 # The private /+ modifier means "print $' afterwards".
87 nigel 41
88     $showrest = ($pattern =~ s/\+(?=[a-z]*$)//);
89    
90 nigel 91 # Remove /8 from a UTF-8 pattern.
91 nigel 63
92 nigel 91 $utf8 = $pattern =~ s/8(?=[a-z]*$)//;
93 ph10 459
94     # Remove /J from a pattern with duplicate names.
95    
96     $pattern =~ s/J(?=[a-z]*$)//;
97 nigel 63
98 nigel 3 # Check that the pattern is valid
99    
100 nigel 91 eval "\$_ =~ ${pattern}";
101 nigel 3 if ($@)
102     {
103 nigel 23 printf $outfile "Error: $@";
104 nigel 3 next NEXT_RE;
105     }
106    
107 nigel 41 # If the /g modifier is present, we want to put a loop round the matching;
108     # otherwise just a single "if".
109    
110     $cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
111    
112     # If the pattern is actually the null string, Perl uses the most recently
113     # executed (and successfully compiled) regex is used instead. This is a
114     # nasty trap for the unwary! The PCRE test suite does contain null strings
115     # in places - if they are allowed through here all sorts of weird and
116     # unexpected effects happen. To avoid this, we replace such patterns with
117     # a non-null pattern that has the same effect.
118    
119     $pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
120    
121 nigel 3 # Read data lines and test them
122    
123     for (;;)
124     {
125     printf "data> " if $infile eq "STDIN";
126     last NEXT_RE if ! ($_ = <$infile>);
127     chomp;
128     printf $outfile "$_\n" if $infile ne "STDIN";
129    
130     s/\s+$//;
131     s/^\s+//;
132    
133     last if ($_ eq "");
134 nigel 41 $x = eval "\"$_\""; # To get escapes processed
135 nigel 3
136 nigel 41 # Empty array for holding results, then do the matching.
137 nigel 3
138 nigel 41 @subs = ();
139    
140 nigel 63 $pushes = "push \@subs,\$&;" .
141 nigel 41 "push \@subs,\$1;" .
142     "push \@subs,\$2;" .
143     "push \@subs,\$3;" .
144     "push \@subs,\$4;" .
145     "push \@subs,\$5;" .
146     "push \@subs,\$6;" .
147     "push \@subs,\$7;" .
148     "push \@subs,\$8;" .
149     "push \@subs,\$9;" .
150     "push \@subs,\$10;" .
151     "push \@subs,\$11;" .
152     "push \@subs,\$12;" .
153     "push \@subs,\$13;" .
154     "push \@subs,\$14;" .
155     "push \@subs,\$15;" .
156     "push \@subs,\$16;" .
157     "push \@subs,\$'; }";
158    
159 nigel 91 eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
160 nigel 63
161 nigel 3 if ($@)
162     {
163     printf $outfile "Error: $@\n";
164     next NEXT_RE;
165     }
166 nigel 41 elsif (scalar(@subs) == 0)
167 nigel 3 {
168     printf $outfile "No match\n";
169     }
170     else
171     {
172 nigel 41 while (scalar(@subs) != 0)
173 nigel 3 {
174 nigel 41 printf $outfile (" 0: %s\n", &pchars($subs[0]));
175     printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
176     $last_printed = 0;
177     for ($i = 1; $i <= 16; $i++)
178 nigel 3 {
179 nigel 41 if (defined $subs[$i])
180     {
181     while ($last_printed++ < $i-1)
182     { printf $outfile ("%2d: <unset>\n", $last_printed); }
183     printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
184     $last_printed = $i;
185     }
186 nigel 3 }
187 nigel 41 splice(@subs, 0, 18);
188 nigel 3 }
189     }
190     }
191     }
192    
193 nigel 75 # printf $outfile "\n";
194 nigel 3
195     # End

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