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Revision 49 - (hide annotations) (download)
Sat Feb 24 21:39:33 2007 UTC (7 years, 8 months ago) by nigel
File size: 4833 byte(s)
Load pcre-3.3 into code/trunk.

1 nigel 49 #! /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. It
5     # requires at least Perl 5.6.
6    
7    
8     # Function for turning a string into a string of printing chars. There are
9     # currently problems with UTF-8 strings; this fudges round them.
10    
11     sub pchars {
12     my($t) = "";
13    
14     if ($utf8)
15     {
16     use utf8;
17     @p = unpack('U*', $_[0]);
18     foreach $c (@p)
19     {
20     if ($c >= 32 && $c < 127) { $t .= chr $c; }
21     else { $t .= sprintf("\\x{%02x}", $c); }
22     }
23     }
24    
25     else
26     {
27     foreach $c (split(//, $_[0]))
28     {
29     if (ord $c >= 32 && ord $c < 127) { $t .= $c; }
30     else { $t .= sprintf("\\x%02x", ord $c); }
31     }
32     }
33    
34     $t;
35     }
36    
37    
38    
39     # Read lines from named file or stdin and write to named file or stdout; lines
40     # consist of a regular expression, in delimiters and optionally followed by
41     # options, followed by a set of test data, terminated by an empty line.
42    
43     # Sort out the input and output files
44    
45     if (@ARGV > 0)
46     {
47     open(INFILE, "<$ARGV[0]") || die "Failed to open $ARGV[0]\n";
48     $infile = "INFILE";
49     }
50     else { $infile = "STDIN"; }
51    
52     if (@ARGV > 1)
53     {
54     open(OUTFILE, ">$ARGV[1]") || die "Failed to open $ARGV[1]\n";
55     $outfile = "OUTFILE";
56     }
57     else { $outfile = "STDOUT"; }
58    
59     printf($outfile "Perl $] Regular Expressions\n\n");
60    
61     # Main loop
62    
63     NEXT_RE:
64     for (;;)
65     {
66     printf " re> " if $infile eq "STDIN";
67     last if ! ($_ = <$infile>);
68     printf $outfile "$_" if $infile ne "STDIN";
69     next if ($_ eq "");
70    
71     $pattern = $_;
72    
73     while ($pattern !~ /^\s*(.).*\1/s)
74     {
75     printf " > " if $infile eq "STDIN";
76     last if ! ($_ = <$infile>);
77     printf $outfile "$_" if $infile ne "STDIN";
78     $pattern .= $_;
79     }
80    
81     chomp($pattern);
82     $pattern =~ s/\s+$//;
83    
84     # The private /+ modifier means "print $' afterwards".
85    
86     $showrest = ($pattern =~ s/\+(?=[a-z]*$)//);
87    
88     # The private /8 modifier means "operate in UTF-8". Currently, Perl
89     # has bugs that we try to work around using this flag.
90    
91     $utf8 = ($pattern =~ s/8(?=[a-z]*$)//);
92    
93     # Check that the pattern is valid
94    
95     if ($utf8)
96     {
97     use utf8;
98     eval "\$_ =~ ${pattern}";
99     }
100     else
101     {
102     eval "\$_ =~ ${pattern}";
103     }
104    
105     if ($@)
106     {
107     printf $outfile "Error: $@";
108     next NEXT_RE;
109     }
110    
111     # If the /g modifier is present, we want to put a loop round the matching;
112     # otherwise just a single "if".
113    
114     $cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
115    
116     # If the pattern is actually the null string, Perl uses the most recently
117     # executed (and successfully compiled) regex is used instead. This is a
118     # nasty trap for the unwary! The PCRE test suite does contain null strings
119     # in places - if they are allowed through here all sorts of weird and
120     # unexpected effects happen. To avoid this, we replace such patterns with
121     # a non-null pattern that has the same effect.
122    
123     $pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
124    
125     # Read data lines and test them
126    
127     for (;;)
128     {
129     printf "data> " if $infile eq "STDIN";
130     last NEXT_RE if ! ($_ = <$infile>);
131     chomp;
132     printf $outfile "$_\n" if $infile ne "STDIN";
133    
134     s/\s+$//;
135     s/^\s+//;
136    
137     last if ($_ eq "");
138    
139     $x = eval "\"$_\""; # To get escapes processed
140    
141     # Empty array for holding results, then do the matching.
142    
143     @subs = ();
144    
145     $pushes = "push \@subs,\$&;" .
146     "push \@subs,\$1;" .
147     "push \@subs,\$2;" .
148     "push \@subs,\$3;" .
149     "push \@subs,\$4;" .
150     "push \@subs,\$5;" .
151     "push \@subs,\$6;" .
152     "push \@subs,\$7;" .
153     "push \@subs,\$8;" .
154     "push \@subs,\$9;" .
155     "push \@subs,\$10;" .
156     "push \@subs,\$11;" .
157     "push \@subs,\$12;" .
158     "push \@subs,\$13;" .
159     "push \@subs,\$14;" .
160     "push \@subs,\$15;" .
161     "push \@subs,\$16;" .
162     "push \@subs,\$'; }";
163    
164     if ($utf8)
165     {
166     use utf8;
167     eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
168     }
169     else
170     {
171     eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
172     }
173    
174     if ($@)
175     {
176     printf $outfile "Error: $@\n";
177     next NEXT_RE;
178     }
179     elsif (scalar(@subs) == 0)
180     {
181     printf $outfile "No match\n";
182     }
183     else
184     {
185     while (scalar(@subs) != 0)
186     {
187     printf $outfile (" 0: %s\n", &pchars($subs[0]));
188     printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
189     $last_printed = 0;
190     for ($i = 1; $i <= 16; $i++)
191     {
192     if (defined $subs[$i])
193     {
194     while ($last_printed++ < $i-1)
195     { printf $outfile ("%2d: <unset>\n", $last_printed); }
196     printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
197     $last_printed = $i;
198     }
199     }
200     splice(@subs, 0, 18);
201     }
202     }
203     }
204     }
205    
206     printf $outfile "\n";
207    
208     # End

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