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Contents of /code/trunk/perltest.pl

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Revision 1399 - (show annotations)
Tue Nov 12 16:03:01 2013 UTC (6 years ago) by ph10
File MIME type: text/plain
File size: 6131 byte(s)
Wrong modifier messages in pcretest to go to stdout; update which modifiers are 
forbidden in Perl-compatible tests.
1 #! /usr/bin/env perl
2
3 # Program for testing regular expressions with perl to check that PCRE handles
4 # them the same. This version needs to have "use utf8" at the start for running
5 # the UTF-8 tests, but *not* for the other tests. The only way I've found for
6 # doing this is to cat this line in explicitly in the RunPerlTest script. I've
7 # also used this method to supply "require Encode" for the UTF-8 tests, so that
8 # the main test will still run where Encode is not installed.
9
10 #use utf8;
11 #require Encode;
12
13 # Function for turning a string into a string of printing chars.
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 $infile ne "STDIN";
71 next if ($_ =~ /^\s*$/ || $_ =~ /^< forbid/);
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-zA-Z]*$)//);
89
90 # A doubled version is used by pcretest to print remainders after captures
91
92 $pattern =~ s/\+(?=[a-zA-Z]*$)//;
93
94 # Remove /8 from a UTF-8 pattern.
95
96 $utf8 = $pattern =~ s/8(?=[a-zA-Z]*$)//;
97
98 # Remove /J from a pattern with duplicate names.
99
100 $pattern =~ s/J(?=[a-zA-Z]*$)//;
101
102 # Remove /K from a pattern (asks pcretest to check MARK data) */
103
104 $pattern =~ s/K(?=[a-zA-Z]*$)//;
105
106 # /W asks pcretest to set PCRE_UCP; change this to /u for Perl
107
108 $pattern =~ s/W(?=[a-zA-Z]*$)/u/;
109
110 # Remove /S or /SS from a pattern (asks pcretest to study or not to study)
111
112 $pattern =~ s/S(?=[a-zA-Z]*$)//g;
113
114 # Remove /Y and /O from a pattern (disable PCRE optimizations)
115
116 $pattern =~ s/[YO](?=[a-zA-Z]*$)//;
117
118 # Check that the pattern is valid
119
120 eval "\$_ =~ ${pattern}";
121 if ($@)
122 {
123 printf $outfile "Error: $@";
124 next NEXT_RE;
125 }
126
127 # If the /g modifier is present, we want to put a loop round the matching;
128 # otherwise just a single "if".
129
130 $cmd = ($pattern =~ /g[a-z]*$/)? "while" : "if";
131
132 # If the pattern is actually the null string, Perl uses the most recently
133 # executed (and successfully compiled) regex is used instead. This is a
134 # nasty trap for the unwary! The PCRE test suite does contain null strings
135 # in places - if they are allowed through here all sorts of weird and
136 # unexpected effects happen. To avoid this, we replace such patterns with
137 # a non-null pattern that has the same effect.
138
139 $pattern = "/(?#)/$2" if ($pattern =~ /^(.)\1(.*)$/);
140
141 # Read data lines and test them
142
143 for (;;)
144 {
145 printf "data> " if $infile eq "STDIN";
146 last NEXT_RE if ! ($_ = <$infile>);
147 chomp;
148 printf $outfile "$_\n" if $infile ne "STDIN";
149
150 s/\s+$//; # Remove trailing space
151 s/^\s+//; # Remove leading space
152 s/\\Y//g; # Remove \Y (pcretest flag to set PCRE_NO_START_OPTIMIZE)
153
154 last if ($_ eq "");
155 $x = eval "\"$_\""; # To get escapes processed
156
157 # Empty array for holding results, ensure $REGERROR and $REGMARK are
158 # unset, then do the matching.
159
160 @subs = ();
161
162 $pushes = "push \@subs,\$&;" .
163 "push \@subs,\$1;" .
164 "push \@subs,\$2;" .
165 "push \@subs,\$3;" .
166 "push \@subs,\$4;" .
167 "push \@subs,\$5;" .
168 "push \@subs,\$6;" .
169 "push \@subs,\$7;" .
170 "push \@subs,\$8;" .
171 "push \@subs,\$9;" .
172 "push \@subs,\$10;" .
173 "push \@subs,\$11;" .
174 "push \@subs,\$12;" .
175 "push \@subs,\$13;" .
176 "push \@subs,\$14;" .
177 "push \@subs,\$15;" .
178 "push \@subs,\$16;" .
179 "push \@subs,\$'; }";
180
181 undef $REGERROR;
182 undef $REGMARK;
183
184 eval "${cmd} (\$x =~ ${pattern}) {" . $pushes;
185
186 if ($@)
187 {
188 printf $outfile "Error: $@\n";
189 next NEXT_RE;
190 }
191 elsif (scalar(@subs) == 0)
192 {
193 printf $outfile "No match";
194 if (defined $REGERROR && $REGERROR != 1)
195 { printf $outfile (", mark = %s", &pchars($REGERROR)); }
196 printf $outfile "\n";
197 }
198 else
199 {
200 while (scalar(@subs) != 0)
201 {
202 printf $outfile (" 0: %s\n", &pchars($subs[0]));
203 printf $outfile (" 0+ %s\n", &pchars($subs[17])) if $showrest;
204 $last_printed = 0;
205 for ($i = 1; $i <= 16; $i++)
206 {
207 if (defined $subs[$i])
208 {
209 while ($last_printed++ < $i-1)
210 { printf $outfile ("%2d: <unset>\n", $last_printed); }
211 printf $outfile ("%2d: %s\n", $i, &pchars($subs[$i]));
212 $last_printed = $i;
213 }
214 }
215 splice(@subs, 0, 18);
216 }
217
218 # It seems that $REGMARK is not marked as UTF-8 even when use utf8 is
219 # set and the input pattern was a UTF-8 string. We can, however, force
220 # it to be so marked.
221
222 if (defined $REGMARK && $REGMARK != 1)
223 {
224 $xx = $REGMARK;
225 $xx = Encode::decode_utf8($xx) if $utf8;
226 printf $outfile ("MK: %s\n", &pchars($xx));
227 }
228 }
229 }
230 }
231
232 # printf $outfile "\n";
233
234 # End

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