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1 | package SQL::Abstract::Test; # see doc at end of file |
2 | |
3 | use strict; |
4 | use warnings; |
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5 | use base qw/Test::Builder::Module Exporter/; |
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6 | use Data::Dumper; |
7 | use Carp; |
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8 | use Test::Builder; |
9 | use Test::Deep qw(eq_deeply); |
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10 | |
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11 | our @EXPORT_OK = qw/&is_same_sql_bind &is_same_sql &is_same_bind |
12 | &eq_sql_bind &eq_sql &eq_bind |
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13 | $case_sensitive $sql_differ/; |
14 | |
15 | our $case_sensitive = 0; |
16 | our $sql_differ; # keeps track of differing portion between SQLs |
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17 | our $tb = __PACKAGE__->builder; |
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18 | |
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19 | # Parser states for _recurse_parse() |
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20 | use constant PARSE_TOP_LEVEL => 0; |
21 | use constant PARSE_IN_EXPR => 1; |
22 | use constant PARSE_IN_PARENS => 2; |
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23 | |
24 | # These SQL keywords always signal end of the current expression (except inside |
25 | # of a parenthesized subexpression). |
26 | # Format: A list of strings that will be compiled to extended syntax (ie. |
27 | # /.../x) regexes, without capturing parentheses. They will be automatically |
28 | # anchored to word boundaries to match the whole token). |
29 | my @expression_terminator_sql_keywords = ( |
30 | 'FROM', |
31 | '(?: |
32 | (?: |
33 | (?: \b (?: LEFT | RIGHT | FULL ) \s+ )? |
34 | (?: \b (?: CROSS | INNER | OUTER ) \s+ )? |
35 | )? |
36 | JOIN |
37 | )', |
38 | 'ON', |
39 | 'WHERE', |
40 | 'GROUP \s+ BY', |
41 | 'HAVING', |
42 | 'ORDER \s+ BY', |
43 | 'LIMIT', |
44 | 'OFFSET', |
45 | 'FOR', |
46 | 'UNION', |
47 | 'INTERSECT', |
48 | 'EXCEPT', |
49 | ); |
50 | |
51 | my $tokenizer_re_str = join('|', |
52 | map { '\b' . $_ . '\b' } |
53 | @expression_terminator_sql_keywords, 'AND', 'OR' |
54 | ); |
55 | |
56 | my $tokenizer_re = qr/ |
57 | \s* |
58 | ( |
59 | \( |
60 | | |
61 | \) |
62 | | |
63 | $tokenizer_re_str |
64 | ) |
65 | \s* |
66 | /xi; |
67 | |
68 | |
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69 | sub is_same_sql_bind { |
70 | my ($sql1, $bind_ref1, $sql2, $bind_ref2, $msg) = @_; |
71 | |
72 | # compare |
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73 | my $same_sql = eq_sql($sql1, $sql2); |
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74 | my $same_bind = eq_bind($bind_ref1, $bind_ref2); |
75 | |
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76 | # call Test::Builder::ok |
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77 | $tb->ok($same_sql && $same_bind, $msg); |
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78 | |
79 | # add debugging info |
80 | if (!$same_sql) { |
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81 | _sql_differ_diag($sql1, $sql2); |
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82 | } |
83 | if (!$same_bind) { |
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84 | _bind_differ_diag($bind_ref1, $bind_ref2); |
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85 | } |
86 | } |
87 | |
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88 | sub is_same_sql { |
89 | my ($sql1, $sql2, $msg) = @_; |
90 | |
91 | # compare |
92 | my $same_sql = eq_sql($sql1, $sql2); |
93 | |
94 | # call Test::Builder::ok |
95 | $tb->ok($same_sql, $msg); |
96 | |
97 | # add debugging info |
98 | if (!$same_sql) { |
99 | _sql_differ_diag($sql1, $sql2); |
100 | } |
101 | } |
102 | |
103 | sub is_same_bind { |
104 | my ($bind_ref1, $bind_ref2, $msg) = @_; |
105 | |
106 | # compare |
107 | my $same_bind = eq_bind($bind_ref1, $bind_ref2); |
108 | |
109 | # call Test::Builder::ok |
110 | $tb->ok($same_bind, $msg); |
111 | |
112 | # add debugging info |
113 | if (!$same_bind) { |
114 | _bind_differ_diag($bind_ref1, $bind_ref2); |
115 | } |
116 | } |
117 | |
118 | sub _sql_differ_diag { |
119 | my ($sql1, $sql2) = @_; |
120 | |
121 | $tb->diag("SQL expressions differ\n" |
122 | ." got: $sql1\n" |
123 | ."expected: $sql2\n" |
124 | ."differing in :\n$sql_differ\n" |
125 | ); |
126 | } |
127 | |
128 | sub _bind_differ_diag { |
129 | my ($bind_ref1, $bind_ref2) = @_; |
130 | |
131 | $tb->diag("BIND values differ\n" |
132 | ." got: " . Dumper($bind_ref1) |
133 | ."expected: " . Dumper($bind_ref2) |
134 | ); |
135 | } |
136 | |
137 | sub eq_sql_bind { |
138 | my ($sql1, $bind_ref1, $sql2, $bind_ref2) = @_; |
139 | |
140 | return eq_sql($sql1, $sql2) && eq_bind($bind_ref1, $bind_ref2); |
141 | } |
142 | |
143 | |
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144 | sub eq_bind { |
145 | my ($bind_ref1, $bind_ref2) = @_; |
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146 | |
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147 | return eq_deeply($bind_ref1, $bind_ref2); |
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148 | } |
149 | |
150 | sub eq_sql { |
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151 | my ($sql1, $sql2) = @_; |
152 | |
153 | # parse |
154 | my $tree1 = parse($sql1); |
155 | my $tree2 = parse($sql2); |
156 | |
157 | return _eq_sql($tree1, $tree2); |
158 | } |
159 | |
160 | sub _eq_sql { |
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161 | my ($left, $right) = @_; |
162 | |
163 | # ignore top-level parentheses |
164 | while ($left->[0] eq 'PAREN') {$left = $left->[1] } |
165 | while ($right->[0] eq 'PAREN') {$right = $right->[1]} |
166 | |
167 | # if operators are different |
168 | if ($left->[0] ne $right->[0]) { |
169 | $sql_differ = sprintf "OP [$left->[0]] != [$right->[0]] in\nleft: %s\nright: %s\n", |
170 | unparse($left), |
171 | unparse($right); |
172 | return 0; |
173 | } |
174 | # elsif operators are identical, compare operands |
175 | else { |
176 | if ($left->[0] eq 'EXPR' ) { # unary operator |
177 | (my $l = " $left->[1] " ) =~ s/\s+/ /g; |
178 | (my $r = " $right->[1] ") =~ s/\s+/ /g; |
179 | my $eq = $case_sensitive ? $l eq $r : uc($l) eq uc($r); |
180 | $sql_differ = "[$left->[1]] != [$right->[1]]\n" if not $eq; |
181 | return $eq; |
182 | } |
183 | else { # binary operator |
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184 | return _eq_sql($left->[1][0], $right->[1][0]) # left operand |
185 | && _eq_sql($left->[1][1], $right->[1][1]); # right operand |
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186 | } |
187 | } |
188 | } |
189 | |
190 | |
191 | sub parse { |
192 | my $s = shift; |
193 | |
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194 | # tokenize string, and remove all optional whitespace |
195 | my $tokens = []; |
196 | foreach my $token (split $tokenizer_re, $s) { |
197 | $token =~ s/\s+/ /g; |
198 | $token =~ s/\s+([^\w\s])/$1/g; |
199 | $token =~ s/([^\w\s])\s+/$1/g; |
200 | push @$tokens, $token if $token !~ /^$/; |
201 | } |
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202 | |
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203 | my $tree = _recurse_parse($tokens, PARSE_TOP_LEVEL); |
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204 | return $tree; |
205 | } |
206 | |
207 | sub _recurse_parse { |
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208 | my ($tokens, $state) = @_; |
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209 | |
210 | my $left; |
211 | while (1) { # left-associative parsing |
212 | |
213 | my $lookahead = $tokens->[0]; |
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214 | return $left if !defined($lookahead) |
215 | || ($state == PARSE_IN_PARENS && $lookahead eq ')') |
216 | || ($state == PARSE_IN_EXPR && grep { $lookahead =~ /^$_$/xi } |
217 | '\)', @expression_terminator_sql_keywords |
218 | ); |
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219 | |
220 | my $token = shift @$tokens; |
221 | |
222 | # nested expression in () |
223 | if ($token eq '(') { |
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224 | my $right = _recurse_parse($tokens, PARSE_IN_PARENS); |
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225 | $token = shift @$tokens or croak "missing ')'"; |
226 | $token eq ')' or croak "unexpected token : $token"; |
227 | $left = $left ? [CONCAT => [$left, [PAREN => $right]]] |
228 | : [PAREN => $right]; |
229 | } |
230 | # AND/OR |
231 | elsif ($token eq 'AND' || $token eq 'OR') { |
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232 | my $right = _recurse_parse($tokens, PARSE_IN_EXPR); |
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233 | $left = [$token => [$left, $right]]; |
234 | } |
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235 | # expression terminator keywords (as they start a new expression) |
236 | elsif (grep { $token =~ /^$_$/xi } @expression_terminator_sql_keywords) { |
237 | my $right = _recurse_parse($tokens, PARSE_IN_EXPR); |
238 | $left = $left ? [CONCAT => [$left, [CONCAT => [[EXPR => $token], [PAREN => $right]]]]] |
239 | : [CONCAT => [[EXPR => $token], [PAREN => $right]]]; |
240 | } |
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241 | # leaf expression |
242 | else { |
243 | $left = $left ? [CONCAT => [$left, [EXPR => $token]]] |
244 | : [EXPR => $token]; |
245 | } |
246 | } |
247 | } |
248 | |
249 | |
250 | |
251 | sub unparse { |
252 | my $tree = shift; |
253 | my $dispatch = { |
254 | EXPR => sub {$tree->[1] }, |
255 | PAREN => sub {"(" . unparse($tree->[1]) . ")" }, |
256 | CONCAT => sub {join " ", map {unparse($_)} @{$tree->[1]}}, |
257 | AND => sub {join " AND ", map {unparse($_)} @{$tree->[1]}}, |
258 | OR => sub {join " OR ", map {unparse($_)} @{$tree->[1]}}, |
259 | }; |
260 | $dispatch->{$tree->[0]}->(); |
261 | } |
262 | |
263 | |
264 | 1; |
265 | |
266 | |
267 | __END__ |
268 | |
269 | =head1 NAME |
270 | |
271 | SQL::Abstract::Test - Helper function for testing SQL::Abstract |
272 | |
273 | =head1 SYNOPSIS |
274 | |
275 | use SQL::Abstract; |
276 | use Test::More; |
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277 | use SQL::Abstract::Test import => [qw/ |
278 | is_same_sql_bind is_same_sql is_same_bind |
279 | eq_sql_bind eq_sql eq_bind |
280 | /]; |
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281 | |
282 | my ($sql, @bind) = SQL::Abstract->new->select(%args); |
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283 | |
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284 | is_same_sql_bind($given_sql, \@given_bind, |
285 | $expected_sql, \@expected_bind, $test_msg); |
286 | |
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287 | is_same_sql($given_sql, $expected_sql, $test_msg); |
288 | is_same_bind(\@given_bind, \@expected_bind, $test_msg); |
289 | |
290 | my $is_same = eq_sql_bind($given_sql, \@given_bind, |
291 | $expected_sql, \@expected_bind); |
292 | |
293 | my $sql_same = eq_sql($given_sql, $expected_sql); |
294 | my $bind_same = eq_bind(\@given_bind, \@expected_bind); |
295 | |
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296 | =head1 DESCRIPTION |
297 | |
298 | This module is only intended for authors of tests on |
299 | L<SQL::Abstract|SQL::Abstract> and related modules; |
300 | it exports functions for comparing two SQL statements |
301 | and their bound values. |
302 | |
303 | The SQL comparison is performed on I<abstract syntax>, |
304 | ignoring differences in spaces or in levels of parentheses. |
305 | Therefore the tests will pass as long as the semantics |
306 | is preserved, even if the surface syntax has changed. |
307 | |
308 | B<Disclaimer> : this is only a half-cooked semantic equivalence; |
309 | parsing is simple-minded, and comparison of SQL abstract syntax trees |
310 | ignores commutativity or associativity of AND/OR operators, Morgan |
311 | laws, etc. |
312 | |
313 | =head1 FUNCTIONS |
314 | |
315 | =head2 is_same_sql_bind |
316 | |
317 | is_same_sql_bind($given_sql, \@given_bind, |
318 | $expected_sql, \@expected_bind, $test_msg); |
319 | |
320 | Compares given and expected pairs of C<($sql, \@bind)>, and calls |
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321 | L<Test::Builder/ok> on the result, with C<$test_msg> as message. If the test |
322 | fails, a detailed diagnostic is printed. For clients which use L<Test::More>, |
323 | this is the one of the three functions (L</is_same_sql_bind>, L</is_same_sql>, |
324 | L</is_same_bind>) that needs to be imported. |
325 | |
326 | =head2 is_same_sql |
327 | |
328 | is_same_sql($given_sql, $expected_sql, $test_msg); |
329 | |
330 | Compares given and expected SQL statements, and calls L<Test::Builder/ok> on |
331 | the result, with C<$test_msg> as message. If the test fails, a detailed |
332 | diagnostic is printed. For clients which use L<Test::More>, this is the one of |
333 | the three functions (L</is_same_sql_bind>, L</is_same_sql>, L</is_same_bind>) |
334 | that needs to be imported. |
335 | |
336 | =head2 is_same_bind |
337 | |
338 | is_same_bind(\@given_bind, \@expected_bind, $test_msg); |
339 | |
340 | Compares given and expected bind values, and calls L<Test::Builder/ok> on the |
341 | result, with C<$test_msg> as message. If the test fails, a detailed diagnostic |
342 | is printed. For clients which use L<Test::More>, this is the one of the three |
343 | functions (L</is_same_sql_bind>, L</is_same_sql>, L</is_same_bind>) that needs |
344 | to be imported. |
345 | |
346 | =head2 eq_sql_bind |
347 | |
348 | my $is_same = eq_sql_bind($given_sql, \@given_bind, |
349 | $expected_sql, \@expected_bind); |
350 | |
351 | Compares given and expected pairs of C<($sql, \@bind)>. Similar to |
352 | L</is_same_sql_bind>, but it just returns a boolean value and does not print |
353 | diagnostics or talk to L<Test::Builder>. |
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354 | |
355 | =head2 eq_sql |
356 | |
357 | my $is_same = eq_sql($given_sql, $expected_sql); |
358 | |
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359 | Compares the abstract syntax of two SQL statements. Similar to L</is_same_sql>, |
360 | but it just returns a boolean value and does not print diagnostics or talk to |
361 | L<Test::Builder>. If the result is false, the global variable L</$sql_differ> |
362 | will contain the SQL portion where a difference was encountered; this is useful |
363 | for printing diagnostics. |
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364 | |
365 | =head2 eq_bind |
366 | |
367 | my $is_same = eq_sql(\@given_bind, \@expected_bind); |
368 | |
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369 | Compares two lists of bind values, taking into account the fact that some of |
370 | the values may be arrayrefs (see L<SQL::Abstract/bindtype>). Similar to |
371 | L</is_same_bind>, but it just returns a boolean value and does not print |
372 | diagnostics or talk to L<Test::Builder>. |
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373 | |
374 | =head1 GLOBAL VARIABLES |
375 | |
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376 | =head2 $case_sensitive |
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377 | |
378 | If true, SQL comparisons will be case-sensitive. Default is false; |
379 | |
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380 | =head2 $sql_differ |
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381 | |
382 | When L</eq_sql> returns false, the global variable |
383 | C<$sql_differ> contains the SQL portion |
384 | where a difference was encountered. |
385 | |
386 | |
387 | =head1 SEE ALSO |
388 | |
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389 | L<SQL::Abstract>, L<Test::More>, L<Test::Builder>. |
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390 | |
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391 | =head1 AUTHORS |
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392 | |
393 | Laurent Dami, E<lt>laurent.dami AT etat geneve chE<gt> |
394 | |
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395 | Norbert Buchmuller <norbi@nix.hu> |
396 | |
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397 | =head1 COPYRIGHT AND LICENSE |
398 | |
399 | Copyright 2008 by Laurent Dami. |
400 | |
401 | This library is free software; you can redistribute it and/or modify |
402 | it under the same terms as Perl itself. |