5 #P = start of string Q = start of substr R = end of substr S = end of string
10 $SIG{__WARN__} = sub {
11 if ($_[0] =~ /^substr outside of string/) {
13 } elsif ($_[0] =~ /^Attempt to use reference as lvalue in substr/) {
15 } elsif ($_[0] =~ /^Use of uninitialized value/) {
22 sub fail { !defined(shift) && $w-- };
24 print (substr($a,0,3) eq 'abc' ? "ok 1\n" : "not ok 1\n"); # P=Q R S
25 print (substr($a,3,3) eq 'def' ? "ok 2\n" : "not ok 2\n"); # P Q R S
26 print (substr($a,6,999) eq 'xyz' ? "ok 3\n" : "not ok 3\n"); # P Q S R
27 print (fail(substr($a,999,999)) ? "ok 4\n" : "not ok 4\n"); # P R Q S
28 print (substr($a,0,-6) eq 'abc' ? "ok 5\n" : "not ok 5\n"); # P=Q R S
29 print (substr($a,-3,1) eq 'x' ? "ok 6\n" : "not ok 6\n"); # P Q R S
33 print (substr($a,1,3) eq 'abc' ? "ok 7\n" : "not ok 7\n"); # P=Q R S
34 print (substr($a,4,3) eq 'def' ? "ok 8\n" : "not ok 8\n"); # P Q R S
35 print (substr($a,7,999) eq 'xyz' ? "ok 9\n" : "not ok 9\n"); # P Q S R
36 print (fail(substr($a,999,999)) ? "ok 10\n" : "not ok 10\n");# P R Q S
37 print (substr($a,1,-6) eq 'abc' ? "ok 11\n" : "not ok 11\n");# P=Q R S
38 print (substr($a,-3,1) eq 'x' ? "ok 12\n" : "not ok 12\n"); # P Q R S
42 substr($a,3,3) = 'XYZ';
43 print $a eq 'abcXYZxyz' ? "ok 13\n" : "not ok 13\n";
45 print $a eq 'cXYZxyz' ? "ok 14\n" : "not ok 14\n";
46 substr($a,0,0) = 'ab';
47 print $a eq 'abcXYZxyz' ? "ok 15\n" : "not ok 15 $a\n";
48 substr($a,0,0) = '12345678';
49 print $a eq '12345678abcXYZxyz' ? "ok 16\n" : "not ok 16\n";
50 substr($a,-3,3) = 'def';
51 print $a eq '12345678abcXYZdef' ? "ok 17\n" : "not ok 17\n";
52 substr($a,-3,3) = '<';
53 print $a eq '12345678abcXYZ<' ? "ok 18\n" : "not ok 18\n";
54 substr($a,-1,1) = '12345678';
55 print $a eq '12345678abcXYZ12345678' ? "ok 19\n" : "not ok 19\n";
59 print (substr($a,6) eq 'xyz' ? "ok 20\n" : "not ok 20\n"); # P Q R=S
60 print (substr($a,-3) eq 'xyz' ? "ok 21\n" : "not ok 21\n"); # P Q R=S
61 print (fail(substr($a,999)) ? "ok 22\n" : "not ok 22\n"); # P R=S Q
62 print (substr($a,0) eq 'abcdefxyz' ? "ok 23\n" : "not ok 23\n");# P=Q R=S
63 print (substr($a,9) eq '' ? "ok 24\n" : "not ok 24\n"); # P Q=R=S
64 print (substr($a,-11) eq 'abcdefxyz' ? "ok 25\n" : "not ok 25\n");# Q P R=S
65 print (substr($a,-9) eq 'abcdefxyz' ? "ok 26\n" : "not ok 26\n"); # P=Q R=S
69 print (fail(substr($a,-7, 1)) ? "ok 27\n" : "not ok 27\n"); # Q R P S
70 print (fail(substr($a,-7,-6)) ? "ok 28\n" : "not ok 28\n"); # Q R P S
71 print (substr($a,-5,-7) eq '' ? "ok 29\n" : "not ok 29\n"); # R P=Q S
72 print (substr($a, 2,-7) eq '' ? "ok 30\n" : "not ok 30\n"); # R P Q S
73 print (substr($a,-3,-7) eq '' ? "ok 31\n" : "not ok 31\n"); # R P Q S
74 print (substr($a, 2,-5) eq '' ? "ok 32\n" : "not ok 32\n"); # P=R Q S
75 print (substr($a,-3,-5) eq '' ? "ok 33\n" : "not ok 33\n"); # P=R Q S
76 print (substr($a, 2,-4) eq '' ? "ok 34\n" : "not ok 34\n"); # P R Q S
77 print (substr($a,-3,-4) eq '' ? "ok 35\n" : "not ok 35\n"); # P R Q S
78 print (substr($a, 5,-6) eq '' ? "ok 36\n" : "not ok 36\n"); # R P Q=S
79 print (substr($a, 5,-5) eq '' ? "ok 37\n" : "not ok 37\n"); # P=R Q S
80 print (substr($a, 5,-3) eq '' ? "ok 38\n" : "not ok 38\n"); # P R Q=S
81 print (fail(substr($a, 7,-7)) ? "ok 39\n" : "not ok 39\n"); # R P S Q
82 print (fail(substr($a, 7,-5)) ? "ok 40\n" : "not ok 40\n"); # P=R S Q
83 print (fail(substr($a, 7,-3)) ? "ok 41\n" : "not ok 41\n"); # P R S Q
84 print (fail(substr($a, 7, 0)) ? "ok 42\n" : "not ok 42\n"); # P S Q=R
86 print (substr($a,-7,2) eq '' ? "ok 43\n" : "not ok 43\n"); # Q P=R S
87 print (substr($a,-7,4) eq '54' ? "ok 44\n" : "not ok 44\n"); # Q P R S
88 print (substr($a,-7,7) eq '54321' ? "ok 45\n" : "not ok 45\n");# Q P R=S
89 print (substr($a,-7,9) eq '54321' ? "ok 46\n" : "not ok 46\n");# Q P S R
90 print (substr($a,-5,0) eq '' ? "ok 47\n" : "not ok 47\n"); # P=Q=R S
91 print (substr($a,-5,3) eq '543' ? "ok 48\n" : "not ok 48\n");# P=Q R S
92 print (substr($a,-5,5) eq '54321' ? "ok 49\n" : "not ok 49\n");# P=Q R=S
93 print (substr($a,-5,7) eq '54321' ? "ok 50\n" : "not ok 50\n");# P=Q S R
94 print (substr($a,-3,0) eq '' ? "ok 51\n" : "not ok 51\n"); # P Q=R S
95 print (substr($a,-3,3) eq '321' ? "ok 52\n" : "not ok 52\n");# P Q R=S
96 print (substr($a,-2,3) eq '21' ? "ok 53\n" : "not ok 53\n"); # P Q S R
97 print (substr($a,0,-5) eq '' ? "ok 54\n" : "not ok 54\n"); # P=Q=R S
98 print (substr($a,2,-3) eq '' ? "ok 55\n" : "not ok 55\n"); # P Q=R S
99 print (substr($a,0,0) eq '' ? "ok 56\n" : "not ok 56\n"); # P=Q=R S
100 print (substr($a,0,5) eq '54321' ? "ok 57\n" : "not ok 57\n");# P=Q R=S
101 print (substr($a,0,7) eq '54321' ? "ok 58\n" : "not ok 58\n");# P=Q S R
102 print (substr($a,2,0) eq '' ? "ok 59\n" : "not ok 59\n"); # P Q=R S
103 print (substr($a,2,3) eq '321' ? "ok 60\n" : "not ok 60\n"); # P Q R=S
104 print (substr($a,5,0) eq '' ? "ok 61\n" : "not ok 61\n"); # P Q=R=S
105 print (substr($a,5,2) eq '' ? "ok 62\n" : "not ok 62\n"); # P Q=S R
106 print (substr($a,-7,-5) eq '' ? "ok 63\n" : "not ok 63\n"); # Q P=R S
107 print (substr($a,-7,-2) eq '543' ? "ok 64\n" : "not ok 64\n");# Q P R S
108 print (substr($a,-5,-5) eq '' ? "ok 65\n" : "not ok 65\n"); # P=Q=R S
109 print (substr($a,-5,-2) eq '543' ? "ok 66\n" : "not ok 66\n");# P=Q R S
110 print (substr($a,-3,-3) eq '' ? "ok 67\n" : "not ok 67\n"); # P Q=R S
111 print (substr($a,-3,-1) eq '32' ? "ok 68\n" : "not ok 68\n");# P Q R S
115 print (substr($a,-2,2) eq '' ? "ok 69\n" : "not ok 69\n"); # Q P=R=S
116 print (substr($a,0,0) eq '' ? "ok 70\n" : "not ok 70\n"); # P=Q=R=S
117 print (substr($a,0,1) eq '' ? "ok 71\n" : "not ok 71\n"); # P=Q=S R
118 print (substr($a,-2,3) eq '' ? "ok 72\n" : "not ok 72\n"); # Q P=S R
119 print (substr($a,-2) eq '' ? "ok 73\n" : "not ok 73\n"); # Q P=R=S
120 print (substr($a,0) eq '' ? "ok 74\n" : "not ok 74\n"); # P=Q=R=S
123 print (substr($a,0,-1) eq '' ? "ok 75\n" : "not ok 75\n"); # R P=Q=S
124 print (fail(substr($a,-2,0)) ? "ok 76\n" : "not ok 76\n"); # Q=R P=S
125 print (fail(substr($a,-2,1)) ? "ok 77\n" : "not ok 77\n"); # Q R P=S
126 print (fail(substr($a,-2,-1)) ? "ok 78\n" : "not ok 78\n"); # Q R P=S
127 print (fail(substr($a,-2,-2)) ? "ok 79\n" : "not ok 79\n"); # Q=R P=S
128 print (fail(substr($a,1,-2)) ? "ok 80\n" : "not ok 81\n"); # R P=S Q
129 print (fail(substr($a,1,1)) ? "ok 81\n" : "not ok 81\n"); # P=S Q R
130 print (fail(substr($a,1,0)) ? "ok 82\n" : "not ok 82\n"); # P=S Q=R
131 print (fail(substr($a,1)) ? "ok 83\n" : "not ok 83\n"); # P=R=S Q
136 print $a eq 'zxcvbnm' ? "ok 84\n" : "not ok 84\n";
138 print $a eq 'zxcvbnm' ? "ok 85\n" : "not ok 85\n";
140 print $a eq 'zxcvbnm' ? "ok 86\n" : "not ok 86\n";
141 substr($a,0,2) = 'pq';
142 print $a eq 'pqcvbnm' ? "ok 87\n" : "not ok 87\n";
143 substr($a,2,0) = 'r';
144 print $a eq 'pqrcvbnm' ? "ok 88\n" : "not ok 88\n";
145 substr($a,8,0) = 'asd';
146 print $a eq 'pqrcvbnmasd' ? "ok 89\n" : "not ok 89\n";
147 substr($a,0,2) = 'iop';
148 print $a eq 'ioprcvbnmasd' ? "ok 90\n" : "not ok 90\n";
149 substr($a,0,5) = 'fgh';
150 print $a eq 'fghvbnmasd' ? "ok 91\n" : "not ok 91\n";
151 substr($a,3,5) = 'jkl';
152 print $a eq 'fghjklsd' ? "ok 92\n" : "not ok 92\n";
153 substr($a,3,2) = '1234';
154 print $a eq 'fgh1234lsd' ? "ok 93\n" : "not ok 93\n";
157 # with lexicals (and in re-entered scopes)
162 substr($txt, -1) = "X";
163 print $txt eq "FoX" ? "ok 94\n" : "not ok 94\n";
166 local $^W = 0; # because of (spurious?) "uninitialised value"
167 substr($txt, 0, 1) = "X";
168 print $txt eq "X" ? "ok 95\n" : "not ok 95\n";
172 # coercion of references
175 substr($s, 0, 1) = 'Foo';
176 print substr($s,0,7) eq "FooRRAY" && !($w-=2) ? "ok 96\n" : "not ok 96\n";
179 # check no spurious warnings
180 print $w ? "not ok 97\n" : "ok 97\n";
182 # check new 4 arg replacement syntax
185 print "not " unless substr($a, 0, 3, "") eq "abc" && $a eq "xyz";
187 print "not " unless substr($a, 0, 0, "abc") eq "" && $a eq "abcxyz";
189 print "not " unless substr($a, 3, -1, "") eq "xy" && $a eq "abcz";
192 print "not " unless substr($a, 3, undef, "xy") eq "" && $a eq "abcxyz"
197 print "not " unless substr($a, 3, 9999999, "") eq "xyz" && $a eq "abc";
199 print "not " unless fail(substr($a, -99, 0, ""));
201 print "not " unless fail(substr($a, 99, 3, ""));
204 substr($a, 0, length($a), "foo");
205 print "not " unless $a eq "foo" && !$w;
208 # using 4 arg substr as lvalue is a compile time error
209 eval 'substr($a,0,0,"") = "abc"';
210 print "not " unless $@ && $@ =~ /Can't modify substr/ && $a eq "foo";
214 print "not " unless sub { shift }->(substr($a, 0, 4, "xxxx")) eq 'abcd';
216 print "not " unless $a eq 'xxxxefgh';