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16dc9970 |
1 | package SQL::Translator; |
2 | |
b346d8f1 |
3 | # ---------------------------------------------------------------------- |
ca1f2237 |
4 | # $Id: Translator.pm,v 1.19 2003-03-12 14:19:52 dlc Exp $ |
b346d8f1 |
5 | # ---------------------------------------------------------------------- |
abfa405a |
6 | # Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>, |
7 | # darren chamberlain <darren@cpan.org>, |
8 | # Chris Mungall <cjm@fruitfly.org> |
1fd8c91f |
9 | # |
077ebf34 |
10 | # This program is free software; you can redistribute it and/or |
11 | # modify it under the terms of the GNU General Public License as |
12 | # published by the Free Software Foundation; version 2. |
ca10f295 |
13 | # |
077ebf34 |
14 | # This program is distributed in the hope that it will be useful, but |
15 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | # General Public License for more details. |
ca10f295 |
18 | # |
077ebf34 |
19 | # You should have received a copy of the GNU General Public License |
20 | # along with this program; if not, write to the Free Software |
21 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
22 | # 02111-1307 USA |
ca10f295 |
23 | # ------------------------------------------------------------------- |
24 | |
16dc9970 |
25 | use strict; |
d529894e |
26 | use vars qw( $VERSION $REVISION $DEFAULT_SUB $DEBUG $ERROR ); |
49e1eb70 |
27 | use base 'Class::Base'; |
c2d3a526 |
28 | |
d529894e |
29 | $VERSION = '0.01'; |
ca1f2237 |
30 | $REVISION = sprintf "%d.%02d", q$Revision: 1.19 $ =~ /(\d+)\.(\d+)/; |
d529894e |
31 | $DEBUG = 0 unless defined $DEBUG; |
32 | $ERROR = ""; |
c2d3a526 |
33 | |
34 | use Carp qw(carp); |
16dc9970 |
35 | |
c0c4aef9 |
36 | use File::Spec::Functions qw(catfile); |
37 | use File::Basename qw(dirname); |
38 | use IO::Dir; |
39 | |
b346d8f1 |
40 | # ---------------------------------------------------------------------- |
41 | # The default behavior is to "pass through" values (note that the |
42 | # SQL::Translator instance is the first value ($_[0]), and the stuff |
43 | # to be parsed is the second value ($_[1]) |
44 | # ---------------------------------------------------------------------- |
45 | $DEFAULT_SUB = sub { $_[1] } unless defined $DEFAULT_SUB; |
16dc9970 |
46 | |
b346d8f1 |
47 | # ---------------------------------------------------------------------- |
c2d3a526 |
48 | # init([ARGS]) |
b346d8f1 |
49 | # The constructor. |
dfb4c915 |
50 | # |
b346d8f1 |
51 | # new takes an optional hash of arguments. These arguments may |
52 | # include a parser, specified with the keys "parser" or "from", |
53 | # and a producer, specified with the keys "producer" or "to". |
dfb4c915 |
54 | # |
b346d8f1 |
55 | # The values that can be passed as the parser or producer are |
56 | # given directly to the parser or producer methods, respectively. |
57 | # See the appropriate method description below for details about |
58 | # what each expects/accepts. |
b346d8f1 |
59 | # ---------------------------------------------------------------------- |
c2d3a526 |
60 | sub init { |
49e1eb70 |
61 | my ( $self, $config ) = @_; |
1fd8c91f |
62 | |
49e1eb70 |
63 | # |
b346d8f1 |
64 | # Set the parser and producer. |
ca10f295 |
65 | # |
b346d8f1 |
66 | # If a 'parser' or 'from' parameter is passed in, use that as the |
67 | # parser; if a 'producer' or 'to' parameter is passed in, use that |
68 | # as the producer; both default to $DEFAULT_SUB. |
49e1eb70 |
69 | # |
70 | $self->parser ($config->{'parser'} || $config->{'from'} || $DEFAULT_SUB); |
c2d3a526 |
71 | $self->producer($config->{'producer'} || $config->{'to'} || $DEFAULT_SUB); |
ca10f295 |
72 | |
49e1eb70 |
73 | # |
e2158c40 |
74 | # Set the parser_args and producer_args |
49e1eb70 |
75 | # |
76 | for my $pargs ( qw[ parser_args producer_args ] ) { |
77 | $self->$pargs( $config->{$pargs} ) if defined $config->{ $pargs }; |
e2158c40 |
78 | } |
79 | |
49e1eb70 |
80 | # |
9398955f |
81 | # Set the data source, if 'filename' or 'file' is provided. |
49e1eb70 |
82 | # |
c2d3a526 |
83 | $config->{'filename'} ||= $config->{'file'} || ""; |
49e1eb70 |
84 | $self->filename( $config->{'filename'} ) if $config->{'filename'}; |
9398955f |
85 | |
49e1eb70 |
86 | # |
87 | # Finally, if there is a 'data' parameter, use that in |
88 | # preference to filename and file |
89 | # |
90 | if ( my $data = $config->{'data'} ) { |
91 | $self->data( $data ); |
9398955f |
92 | } |
93 | |
d529894e |
94 | # |
95 | # Set various other options. |
96 | # |
49e1eb70 |
97 | $self->{'debug'} = defined $config->{'debug'} ? $config->{'debug'} : $DEBUG; |
ca10f295 |
98 | |
96844cae |
99 | |
100 | $self->add_drop_table( $config->{'add_drop_table'} ); |
d529894e |
101 | |
102 | $self->custom_translate( $config->{'xlate'} ); |
103 | |
104 | $self->no_comments( $config->{'no_comments'} ); |
105 | |
96844cae |
106 | $self->show_warnings( $config->{'show_warnings'} ); |
107 | |
108 | $self->trace( $config->{'trace'} ); |
109 | |
ca10f295 |
110 | return $self; |
dfb4c915 |
111 | } |
1fd8c91f |
112 | |
0f3778d0 |
113 | # ---------------------------------------------------------------------- |
114 | # add_drop_table([$bool]) |
115 | # ---------------------------------------------------------------------- |
96844cae |
116 | sub add_drop_table { |
117 | my $self = shift; |
118 | if ( defined (my $arg = shift) ) { |
119 | $self->{'add_drop_table'} = $arg ? 1 : 0; |
120 | } |
121 | return $self->{'add_drop_table'} || 0; |
122 | } |
123 | |
124 | |
0f3778d0 |
125 | # ---------------------------------------------------------------------- |
126 | # custom_translate([$bool]) |
127 | # ---------------------------------------------------------------------- |
d529894e |
128 | sub custom_translate { |
129 | my $self = shift; |
130 | $self->{'custom_translate'} = shift if @_; |
131 | return $self->{'custom_translate'} || {}; |
132 | } |
133 | |
0f3778d0 |
134 | # ---------------------------------------------------------------------- |
135 | # no_comments([$bool]) |
136 | # ---------------------------------------------------------------------- |
d529894e |
137 | sub no_comments { |
138 | my $self = shift; |
139 | my $arg = shift; |
140 | if ( defined $arg ) { |
141 | $self->{'no_comments'} = $arg ? 1 : 0; |
142 | } |
143 | return $self->{'no_comments'} || 0; |
144 | } |
145 | |
e2158c40 |
146 | |
0f3778d0 |
147 | # ---------------------------------------------------------------------- |
148 | # producer([$producer_spec]) |
149 | # |
150 | # Get or set the producer for the current translator. |
151 | # ---------------------------------------------------------------------- |
ca10f295 |
152 | sub producer { |
1fd8c91f |
153 | my $self = shift; |
b346d8f1 |
154 | |
7a8e1f51 |
155 | # producer as a mutator |
ca10f295 |
156 | if (@_) { |
157 | my $producer = shift; |
b346d8f1 |
158 | |
7a8e1f51 |
159 | # Passed a module name (string containing "::") |
ca10f295 |
160 | if ($producer =~ /::/) { |
077ebf34 |
161 | my $func_name; |
b346d8f1 |
162 | |
7a8e1f51 |
163 | # Module name was passed directly |
b346d8f1 |
164 | # We try to load the name; if it doesn't load, there's |
165 | # a possibility that it has a function name attached to |
166 | # it. |
077ebf34 |
167 | if (load($producer)) { |
168 | $func_name = "produce"; |
7a8e1f51 |
169 | } |
b346d8f1 |
170 | |
7a8e1f51 |
171 | # Module::function was passed |
b346d8f1 |
172 | else { |
173 | # Passed Module::Name::function; try to recover |
077ebf34 |
174 | my @func_parts = split /::/, $producer; |
175 | $func_name = pop @func_parts; |
176 | $producer = join "::", @func_parts; |
b346d8f1 |
177 | |
178 | # If this doesn't work, then we have a legitimate |
179 | # problem. |
077ebf34 |
180 | load($producer) or die "Can't load $producer: $@"; |
7a8e1f51 |
181 | } |
077ebf34 |
182 | |
7a8e1f51 |
183 | # get code reference and assign |
077ebf34 |
184 | $self->{'producer'} = \&{ "$producer\::$func_name" }; |
185 | $self->{'producer_type'} = $producer; |
49e1eb70 |
186 | $self->debug("Got producer: $producer\::$func_name\n"); |
7a8e1f51 |
187 | } |
b346d8f1 |
188 | |
7a8e1f51 |
189 | # passed an anonymous subroutine reference |
b346d8f1 |
190 | elsif (isa($producer, 'CODE')) { |
ca10f295 |
191 | $self->{'producer'} = $producer; |
077ebf34 |
192 | $self->{'producer_type'} = "CODE"; |
49e1eb70 |
193 | $self->debug("Got producer: code ref\n"); |
7a8e1f51 |
194 | } |
b346d8f1 |
195 | |
7a8e1f51 |
196 | # passed a string containing no "::"; relative package name |
b346d8f1 |
197 | else { |
ca10f295 |
198 | my $Pp = sprintf "SQL::Translator::Producer::$producer"; |
199 | load($Pp) or die "Can't load $Pp: $@"; |
077ebf34 |
200 | $self->{'producer'} = \&{ "$Pp\::produce" }; |
201 | $self->{'producer_type'} = $Pp; |
49e1eb70 |
202 | $self->debug("Got producer: $Pp\n"); |
7a8e1f51 |
203 | } |
b346d8f1 |
204 | |
ca10f295 |
205 | # At this point, $self->{'producer'} contains a subroutine |
b346d8f1 |
206 | # reference that is ready to run |
e2158c40 |
207 | |
7a8e1f51 |
208 | # Anything left? If so, it's producer_args |
209 | $self->producer_args(@_) if (@_); |
210 | } |
b346d8f1 |
211 | |
ca10f295 |
212 | return $self->{'producer'}; |
213 | }; |
077ebf34 |
214 | |
7a8e1f51 |
215 | # ---------------------------------------------------------------------- |
0f3778d0 |
216 | # producer_type() |
7a8e1f51 |
217 | # |
e2158c40 |
218 | # producer_type is an accessor that allows producer subs to get |
219 | # information about their origin. This is poptentially important; |
ca251f03 |
220 | # since all producer subs are called as subroutine references, there is |
e2158c40 |
221 | # no way for a producer to find out which package the sub lives in |
222 | # originally, for example. |
7a8e1f51 |
223 | # ---------------------------------------------------------------------- |
224 | sub producer_type { $_[0]->{'producer_type'} } |
e2158c40 |
225 | |
7a8e1f51 |
226 | # ---------------------------------------------------------------------- |
0f3778d0 |
227 | # producer_args([\%args]) |
7a8e1f51 |
228 | # |
e2158c40 |
229 | # Arbitrary name => value pairs of paramters can be passed to a |
230 | # producer using this method. |
52b828e8 |
231 | # |
0f3778d0 |
232 | # If the first argument passed in is undef, then the hash of arguments |
233 | # is cleared; all subsequent elements are added to the hash of name, |
234 | # value pairs stored as producer_args. |
7a8e1f51 |
235 | # ---------------------------------------------------------------------- |
e2158c40 |
236 | sub producer_args { |
237 | my $self = shift; |
0f3778d0 |
238 | return $self->_args("producer", @_); |
7a8e1f51 |
239 | } |
ca10f295 |
240 | |
0f3778d0 |
241 | # ---------------------------------------------------------------------- |
242 | # parser([$parser_spec]) |
243 | # ---------------------------------------------------------------------- |
ca10f295 |
244 | sub parser { |
245 | my $self = shift; |
b346d8f1 |
246 | |
7a8e1f51 |
247 | # parser as a mutator |
ca10f295 |
248 | if (@_) { |
249 | my $parser = shift; |
b346d8f1 |
250 | |
7a8e1f51 |
251 | # Passed a module name (string containing "::") |
ca10f295 |
252 | if ($parser =~ /::/) { |
b346d8f1 |
253 | my $func_name; |
254 | |
7a8e1f51 |
255 | # Module name was passed directly |
b346d8f1 |
256 | # We try to load the name; if it doesn't load, there's |
257 | # a possibility that it has a function name attached to |
258 | # it. |
259 | if (load($parser)) { |
260 | $func_name = "parse"; |
7a8e1f51 |
261 | } |
b346d8f1 |
262 | |
7a8e1f51 |
263 | # Module::function was passed |
b346d8f1 |
264 | else { |
265 | # Passed Module::Name::function; try to recover |
266 | my @func_parts = split /::/, $parser; |
267 | $func_name = pop @func_parts; |
268 | $parser = join "::", @func_parts; |
269 | |
270 | # If this doesn't work, then we have a legitimate |
271 | # problem. |
272 | load($parser) or die "Can't load $parser: $@"; |
7a8e1f51 |
273 | } |
b346d8f1 |
274 | |
7a8e1f51 |
275 | # get code reference and assign |
b346d8f1 |
276 | $self->{'parser'} = \&{ "$parser\::$func_name" }; |
077ebf34 |
277 | $self->{'parser_type'} = $parser; |
49e1eb70 |
278 | $self->debug("Got parser: $parser\::$func_name\n"); |
7a8e1f51 |
279 | } |
b346d8f1 |
280 | |
7a8e1f51 |
281 | # passed an anonymous subroutine reference |
49e1eb70 |
282 | elsif ( isa( $parser, 'CODE' ) ) { |
283 | $self->{'parser'} = $parser; |
077ebf34 |
284 | $self->{'parser_type'} = "CODE"; |
49e1eb70 |
285 | $self->debug("Got parser: code ref\n"); |
7a8e1f51 |
286 | } |
b346d8f1 |
287 | |
7a8e1f51 |
288 | # passed a string containing no "::"; relative package name |
b346d8f1 |
289 | else { |
49e1eb70 |
290 | my $Pp = "SQL::Translator::Parser::$parser"; |
291 | load( $Pp ) or die "Can't load $Pp: $@"; |
292 | $self->{'parser'} = \&{ "$Pp\::parse" }; |
077ebf34 |
293 | $self->{'parser_type'} = $Pp; |
49e1eb70 |
294 | $self->debug("Got parser: $Pp\n"); |
7a8e1f51 |
295 | } |
b346d8f1 |
296 | |
49e1eb70 |
297 | # |
b346d8f1 |
298 | # At this point, $self->{'parser'} contains a subroutine |
299 | # reference that is ready to run |
49e1eb70 |
300 | # |
301 | $self->parser_args( @_ ) if (@_); |
7a8e1f51 |
302 | } |
b346d8f1 |
303 | |
ca10f295 |
304 | return $self->{'parser'}; |
16dc9970 |
305 | } |
1fd8c91f |
306 | |
d529894e |
307 | # ---------------------------------------------------------------------- |
077ebf34 |
308 | sub parser_type { $_[0]->{'parser_type'} } |
e2158c40 |
309 | |
e2158c40 |
310 | sub parser_args { |
311 | my $self = shift; |
0f3778d0 |
312 | return $self->_args("parser", @_); |
313 | } |
96844cae |
314 | |
315 | sub show_warnings { |
316 | my $self = shift; |
317 | my $arg = shift; |
318 | if ( defined $arg ) { |
319 | $self->{'show_warnings'} = $arg ? 1 : 0; |
320 | } |
321 | return $self->{'show_warnings'} || 0; |
322 | } |
323 | |
ca10f295 |
324 | |
0f3778d0 |
325 | # filename - get or set the filename |
326 | sub filename { |
327 | my $self = shift; |
328 | if (@_) { |
329 | my $filename = shift; |
330 | if (-d $filename) { |
331 | my $msg = "Cannot use directory '$filename' as input source"; |
332 | return $self->error($msg); |
333 | } elsif (-f _ && -r _) { |
334 | $self->{'filename'} = $filename; |
335 | $self->debug("Got filename: '$self->{'filename'}'\n"); |
336 | } else { |
337 | my $msg = "Cannot use '$filename' as input source: ". |
338 | "file does not exist or is not readable."; |
339 | return $self->error($msg); |
340 | } |
341 | } |
ca10f295 |
342 | |
0f3778d0 |
343 | $self->{'filename'}; |
344 | } |
ca10f295 |
345 | |
0f3778d0 |
346 | # ---------------------------------------------------------------------- |
347 | # data([$data]) |
348 | # |
349 | # if $self->{'data'} is not set, but $self->{'filename'} is, then |
350 | # $self->{'filename'} is opened and read, with the results put into |
351 | # $self->{'data'}. |
352 | # ---------------------------------------------------------------------- |
353 | sub data { |
354 | my $self = shift; |
ca10f295 |
355 | |
0f3778d0 |
356 | # Set $self->{'data'} based on what was passed in. We will |
357 | # accept a number of things; do our best to get it right. |
358 | if (@_) { |
359 | my $data = shift; |
360 | if (isa($data, "SCALAR")) { |
361 | $self->{'data'} = $data; |
362 | } |
363 | else { |
364 | if (isa($data, 'ARRAY')) { |
365 | $data = join '', @$data; |
366 | } |
367 | elsif (isa($data, 'GLOB')) { |
368 | local $/; |
369 | $data = <$data>; |
370 | } |
371 | elsif (! ref $data && @_) { |
372 | $data = join '', $data, @_; |
373 | } |
374 | $self->{'data'} = \$data; |
375 | } |
376 | } |
9398955f |
377 | |
7a8e1f51 |
378 | # If we have a filename but no data yet, populate. |
9398955f |
379 | if (not $self->{'data'} and my $filename = $self->filename) { |
49e1eb70 |
380 | $self->debug("Opening '$filename' to get contents.\n"); |
9398955f |
381 | local *FH; |
382 | local $/; |
383 | my $data; |
384 | |
385 | unless (open FH, $filename) { |
49e1eb70 |
386 | return $self->error("Can't read file '$filename': $!"); |
9398955f |
387 | } |
388 | |
389 | $data = <FH>; |
390 | $self->{'data'} = \$data; |
391 | |
392 | unless (close FH) { |
49e1eb70 |
393 | return $self->error("Can't close file '$filename': $!"); |
9398955f |
394 | } |
395 | } |
9398955f |
396 | |
397 | return $self->{'data'}; |
7a8e1f51 |
398 | } |
9398955f |
399 | |
d529894e |
400 | |
401 | sub trace { |
402 | my $self = shift; |
403 | my $arg = shift; |
404 | if ( defined $arg ) { |
405 | $self->{'trace'} = $arg ? 1 : 0; |
406 | } |
407 | return $self->{'trace'} || 0; |
408 | } |
409 | |
410 | # ---------------------------------------------------------------------- |
0f3778d0 |
411 | # translate([source], [\%args]) |
412 | # |
413 | # translate does the actual translation. The main argument is the |
414 | # source of the data to be translated, which can be a filename, scalar |
415 | # reference, or glob reference. |
416 | # |
417 | # Alternatively, translate takes optional arguements, which are passed |
418 | # to the appropriate places. Most notable of these arguments are |
419 | # parser and producer, which can be used to set the parser and |
420 | # producer, respectively. This is the applications last chance to set |
421 | # these. |
422 | # |
423 | # translate returns a string. |
424 | # ---------------------------------------------------------------------- |
ca251f03 |
425 | sub translate { |
426 | my $self = shift; |
427 | my ($args, $parser, $parser_type, $producer, $producer_type); |
428 | my ($parser_output, $producer_output); |
ca10f295 |
429 | |
7a8e1f51 |
430 | # Parse arguments |
9398955f |
431 | if (@_ == 1) { |
7a8e1f51 |
432 | # Passed a reference to a hash? |
ca10f295 |
433 | if (isa($_[0], 'HASH')) { |
7a8e1f51 |
434 | # yep, a hashref |
49e1eb70 |
435 | $self->debug("translate: Got a hashref\n"); |
ca10f295 |
436 | $args = $_[0]; |
437 | } |
9398955f |
438 | |
0f3778d0 |
439 | # Passed a GLOB reference, i.e., filehandle |
440 | elsif (isa($_[0], 'GLOB')) { |
441 | $self->debug("translate: Got a GLOB reference\n"); |
442 | $self->data($_[0]); |
443 | } |
444 | |
7a8e1f51 |
445 | # Passed a reference to a string containing the data |
ca10f295 |
446 | elsif (isa($_[0], 'SCALAR')) { |
9398955f |
447 | # passed a ref to a string |
49e1eb70 |
448 | $self->debug("translate: Got a SCALAR reference (string)\n"); |
9398955f |
449 | $self->data($_[0]); |
ca10f295 |
450 | } |
9398955f |
451 | |
7a8e1f51 |
452 | # Not a reference; treat it as a filename |
b346d8f1 |
453 | elsif (! ref $_[0]) { |
ca10f295 |
454 | # Not a ref, it's a filename |
49e1eb70 |
455 | $self->debug("translate: Got a filename\n"); |
9398955f |
456 | $self->filename($_[0]); |
ca10f295 |
457 | } |
9398955f |
458 | |
7a8e1f51 |
459 | # Passed something else entirely. |
b346d8f1 |
460 | else { |
461 | # We're not impressed. Take your empty string and leave. |
38254289 |
462 | # return ""; |
463 | |
7a8e1f51 |
464 | # Actually, if data, parser, and producer are set, then we |
465 | # can continue. Too bad, because I like my comment |
466 | # (above)... |
38254289 |
467 | return "" unless ($self->data && |
468 | $self->producer && |
469 | $self->parser); |
b346d8f1 |
470 | } |
16dc9970 |
471 | } |
472 | else { |
b346d8f1 |
473 | # You must pass in a hash, or you get nothing. |
474 | return "" if @_ % 2; |
ca10f295 |
475 | $args = { @_ }; |
7a8e1f51 |
476 | } |
16dc9970 |
477 | |
9398955f |
478 | # ---------------------------------------------------------------------- |
479 | # Can specify the data to be transformed using "filename", "file", |
7a8e1f51 |
480 | # "data", or "datasource". |
9398955f |
481 | # ---------------------------------------------------------------------- |
7a8e1f51 |
482 | if (my $filename = ($args->{'filename'} || $args->{'file'})) { |
9398955f |
483 | $self->filename($filename); |
484 | } |
ca10f295 |
485 | |
7a8e1f51 |
486 | if (my $data = ($self->{'data'} || $self->{'datasource'})) { |
9398955f |
487 | $self->data($data); |
16dc9970 |
488 | } |
ca10f295 |
489 | |
9398955f |
490 | # ---------------------------------------------------------------- |
491 | # Get the data. |
492 | # ---------------------------------------------------------------- |
493 | my $data = $self->data; |
7a8e1f51 |
494 | unless (length $$data) { |
c2d3a526 |
495 | return $self->error("Empty data file!"); |
9398955f |
496 | } |
077ebf34 |
497 | |
9398955f |
498 | # ---------------------------------------------------------------- |
ca10f295 |
499 | # Local reference to the parser subroutine |
9398955f |
500 | # ---------------------------------------------------------------- |
ca10f295 |
501 | if ($parser = ($args->{'parser'} || $args->{'from'})) { |
502 | $self->parser($parser); |
16dc9970 |
503 | } |
7a8e1f51 |
504 | $parser = $self->parser; |
505 | $parser_type = $self->parser_type; |
16dc9970 |
506 | |
9398955f |
507 | # ---------------------------------------------------------------- |
ca10f295 |
508 | # Local reference to the producer subroutine |
9398955f |
509 | # ---------------------------------------------------------------- |
ca10f295 |
510 | if ($producer = ($args->{'producer'} || $args->{'to'})) { |
511 | $self->producer($producer); |
16dc9970 |
512 | } |
7a8e1f51 |
513 | $producer = $self->producer; |
514 | $producer_type = $self->producer_type; |
16dc9970 |
515 | |
9398955f |
516 | # ---------------------------------------------------------------- |
7a8e1f51 |
517 | # Execute the parser, then execute the producer with that output. |
518 | # Allowances are made for each piece to die, or fail to compile, |
519 | # since the referenced subroutines could be almost anything. In |
520 | # the future, each of these might happen in a Safe environment, |
521 | # depending on how paranoid we want to be. |
9398955f |
522 | # ---------------------------------------------------------------- |
7a8e1f51 |
523 | eval { $parser_output = $parser->($self, $$data) }; |
524 | if ($@ || ! $parser_output) { |
525 | my $msg = sprintf "translate: Error with parser '%s': %s", |
526 | $parser_type, ($@) ? $@ : " no results"; |
c2d3a526 |
527 | return $self->error($msg); |
7a8e1f51 |
528 | } |
529 | |
530 | eval { $producer_output = $producer->($self, $parser_output) }; |
531 | if ($@ || ! $producer_output) { |
532 | my $msg = sprintf "translate: Error with producer '%s': %s", |
533 | $producer_type, ($@) ? $@ : " no results"; |
c2d3a526 |
534 | return $self->error($msg); |
7a8e1f51 |
535 | } |
536 | |
537 | return $producer_output; |
16dc9970 |
538 | } |
ca10f295 |
539 | |
d529894e |
540 | # ---------------------------------------------------------------------- |
0f3778d0 |
541 | # list_parsers() |
542 | # |
543 | # Hacky sort of method to list all available parsers. This has |
544 | # several problems: |
545 | # |
546 | # - Only finds things in the SQL::Translator::Parser namespace |
547 | # |
548 | # - Only finds things that are located in the same directory |
549 | # as SQL::Translator::Parser. Yeck. |
550 | # |
551 | # This method will fail in several very likely cases: |
552 | # |
553 | # - Parser modules in different namespaces |
554 | # |
555 | # - Parser modules in the SQL::Translator::Parser namespace that |
556 | # have any XS componenets will be installed in |
557 | # arch_lib/SQL/Translator. |
558 | # |
559 | # ---------------------------------------------------------------------- |
560 | sub list_parsers { |
ca1f2237 |
561 | return shift->_list("parser"); |
0f3778d0 |
562 | } |
563 | |
564 | # ---------------------------------------------------------------------- |
565 | # list_producers() |
566 | # |
567 | # See notes for list_parsers(), above; all the problems apply to |
568 | # list_producers as well. |
569 | # ---------------------------------------------------------------------- |
c0c4aef9 |
570 | sub list_producers { |
ca1f2237 |
571 | return shift->_list("producer"); |
0f3778d0 |
572 | } |
573 | |
c0c4aef9 |
574 | |
0f3778d0 |
575 | # ====================================================================== |
576 | # Private Methods |
577 | # ====================================================================== |
c0c4aef9 |
578 | |
0f3778d0 |
579 | # ---------------------------------------------------------------------- |
580 | # _args($type, \%args); |
581 | # |
582 | # Gets or sets ${type}_args. Called by parser_args and producer_args. |
583 | # ---------------------------------------------------------------------- |
584 | sub _args { |
585 | my $self = shift; |
586 | my $type = shift; |
587 | $type = "${type}_args" unless $type =~ /_args$/; |
588 | |
589 | unless (defined $self->{$type} && isa($self->{$type}, 'HASH')) { |
590 | $self->{$type} = { }; |
591 | } |
592 | |
593 | if (@_) { |
594 | # If the first argument is an explicit undef (remember, we |
595 | # don't get here unless there is stuff in @_), then we clear |
596 | # out the producer_args hash. |
597 | if (! defined $_[0]) { |
598 | shift @_; |
599 | %{$self->{$type}} = (); |
600 | } |
601 | |
602 | my $args = isa($_[0], 'HASH') ? shift : { @_ }; |
603 | %{$self->{$type}} = (%{$self->{$type}}, %$args); |
604 | } |
605 | |
606 | $self->{$type}; |
c0c4aef9 |
607 | } |
608 | |
0f3778d0 |
609 | |
d529894e |
610 | # ---------------------------------------------------------------------- |
0f3778d0 |
611 | # _list($type) |
612 | # ---------------------------------------------------------------------- |
613 | sub _list { |
ca1f2237 |
614 | my $self = shift; |
615 | my $type = shift || return (); |
616 | my $uctype = ucfirst lc $type; |
617 | my %found; |
618 | |
619 | load("SQL::Translator::$uctype") or return (); |
620 | my $path = catfile "SQL", "Translator", $uctype; |
621 | for (@INC) { |
622 | my $dir = catfile $_, $path; |
623 | $self->debug("_list_${type}s searching $dir"); |
624 | next unless -d $dir; |
625 | |
626 | my $dh = IO::Dir->new($dir); |
627 | for (grep /\.pm$/, $dh->read) { |
628 | s/\.pm$//; |
629 | $found{ join "::", "SQL::Translator::$uctype", $_ } = 1; |
630 | } |
631 | } |
c0c4aef9 |
632 | |
ca1f2237 |
633 | return keys %found; |
c0c4aef9 |
634 | } |
635 | |
d529894e |
636 | # ---------------------------------------------------------------------- |
0f3778d0 |
637 | # load($module) |
638 | # |
639 | # Loads a Perl module. Short circuits if a module is already loaded. |
640 | # ---------------------------------------------------------------------- |
ca10f295 |
641 | sub load { |
642 | my $module = do { my $m = shift; $m =~ s[::][/]g; "$m.pm" }; |
643 | return 1 if $INC{$module}; |
ca1f2237 |
644 | |
ca10f295 |
645 | eval { require $module }; |
ca1f2237 |
646 | |
647 | return __PACKAGE__->error($@) if ($@); |
ca10f295 |
648 | return 1; |
1fd8c91f |
649 | } |
16dc9970 |
650 | |
d529894e |
651 | # ---------------------------------------------------------------------- |
0f3778d0 |
652 | # isa($ref, $type) |
653 | # |
654 | # Calls UNIVERSAL::isa($ref, $type). I think UNIVERSAL::isa is ugly, |
655 | # but I like function overhead. |
656 | # ---------------------------------------------------------------------- |
657 | sub isa($$) { |
658 | my ($ref, $type) = @_; |
659 | return UNIVERSAL::isa($ref, $type); |
660 | } |
c2d3a526 |
661 | |
16dc9970 |
662 | 1; |
16dc9970 |
663 | #----------------------------------------------------- |
664 | # Rescue the drowning and tie your shoestrings. |
665 | # Henry David Thoreau |
666 | #----------------------------------------------------- |
667 | |
0f3778d0 |
668 | __END__ |
669 | |
670 | =head1 NAME |
671 | |
672 | SQL::Translator - convert schema from one database to another |
673 | |
674 | =head1 SYNOPSIS |
675 | |
676 | use SQL::Translator; |
677 | |
678 | my $translator = SQL::Translator->new( |
87bf8a3a |
679 | debug => 1, # Print debug info |
680 | trace => 0, # Print Parse::RecDescent trace |
681 | no_comments => 0, # Don't include comments in output |
682 | show_warnings => 0, # Print name mutations, conflicts |
683 | add_drop_table => 1, # Add "drop table" statements |
0f3778d0 |
684 | ); |
685 | |
686 | my $output = $translator->translate( |
687 | from => "MySQL", |
688 | to => "Oracle", |
689 | filename => $file, |
690 | ) or die $translator->error; |
691 | |
692 | print $output; |
693 | |
694 | =head1 DESCRIPTION |
695 | |
696 | This module attempts to simplify the task of converting one database |
697 | create syntax to another through the use of Parsers (which understand |
698 | the source format) and Producers (which understand the destination |
699 | format). The idea is that any Parser can be used with any Producer in |
700 | the conversion process. So, if you wanted Postgres-to-Oracle, you |
701 | would use the Postgres parser and the Oracle producer. |
702 | |
703 | =head1 CONSTRUCTOR |
704 | |
705 | The constructor is called B<new>, and accepts a optional hash of options. |
706 | Valid options are: |
707 | |
708 | =over 4 |
709 | |
ca251f03 |
710 | =item * |
711 | |
712 | parser / from |
713 | |
714 | =item * |
715 | |
716 | parser_args |
0f3778d0 |
717 | |
ca251f03 |
718 | =item * |
0f3778d0 |
719 | |
ca251f03 |
720 | producer / to |
0f3778d0 |
721 | |
ca251f03 |
722 | =item * |
0f3778d0 |
723 | |
ca251f03 |
724 | producer_args |
0f3778d0 |
725 | |
ca251f03 |
726 | =item * |
727 | |
728 | filename / file |
729 | |
730 | =item * |
731 | |
732 | data |
733 | |
734 | =item * |
0f3778d0 |
735 | |
ca251f03 |
736 | debug |
0f3778d0 |
737 | |
738 | =back |
739 | |
740 | All options are, well, optional; these attributes can be set via |
741 | instance methods. Internally, they are; no (non-syntactical) |
742 | advantage is gained by passing options to the constructor. |
743 | |
744 | =head1 METHODS |
745 | |
746 | =head2 B<add_drop_table> |
747 | |
748 | Toggles whether or not to add "DROP TABLE" statements just before the |
749 | create definitions. |
750 | |
751 | =head2 B<custom_translate> |
752 | |
753 | Allows the user to override default translation of fields. For example, |
754 | if a MySQL "text" field would normally be converted to a "long" for Oracle, |
755 | the user could specify to change it to a "CLOB." Accepts a hashref where |
756 | keys are the "from" value and values are the "to," returns the current |
757 | value of the field. |
758 | |
759 | =head2 B<no_comments> |
760 | |
761 | Toggles whether to print comments in the output. Accepts a true or false |
762 | value, returns the current value. |
763 | |
764 | =head2 B<producer> |
765 | |
766 | The B<producer> method is an accessor/mutator, used to retrieve or |
767 | define what subroutine is called to produce the output. A subroutine |
768 | defined as a producer will be invoked as a function (I<not a method>) |
ca251f03 |
769 | and passed 2 parameters: its container C<SQL::Translator> instance and a |
0f3778d0 |
770 | data structure. It is expected that the function transform the data |
ca251f03 |
771 | structure to a string. The C<SQL::Transformer> instance is provided for |
0f3778d0 |
772 | informational purposes; for example, the type of the parser can be |
773 | retrieved using the B<parser_type> method, and the B<error> and |
774 | B<debug> methods can be called when needed. |
775 | |
ca251f03 |
776 | When defining a producer, one of several things can be passed in: A |
777 | module name (e.g., C<My::Groovy::Producer>, a module name relative to |
778 | the C<SQL::Translator::Producer> namespace (e.g., MySQL), a module |
779 | name and function combination (C<My::Groovy::Producer::transmogrify>), |
0f3778d0 |
780 | or a reference to an anonymous subroutine. If a full module name is |
781 | passed in (for the purposes of this method, a string containing "::" |
782 | is considered to be a module name), it is treated as a package, and a |
ca251f03 |
783 | function called "produce" will be invoked: C<$modulename::produce>. |
784 | If $modulename cannot be loaded, the final portion is stripped off and |
0f3778d0 |
785 | treated as a function. In other words, if there is no file named |
ca251f03 |
786 | F<My/Groovy/Producer/transmogrify.pm>, C<SQL::Translator> will attempt |
787 | to load F<My/Groovy/Producer.pm> and use transmogrify as the name of |
788 | the function, instead of the default "produce". |
0f3778d0 |
789 | |
790 | my $tr = SQL::Translator->new; |
791 | |
792 | # This will invoke My::Groovy::Producer::produce($tr, $data) |
793 | $tr->producer("My::Groovy::Producer"); |
794 | |
795 | # This will invoke SQL::Translator::Producer::Sybase::produce($tr, $data) |
796 | $tr->producer("Sybase"); |
797 | |
798 | # This will invoke My::Groovy::Producer::transmogrify($tr, $data), |
799 | # assuming that My::Groovy::Producer::transmogrify is not a module |
800 | # on disk. |
801 | $tr->producer("My::Groovy::Producer::transmogrify"); |
802 | |
803 | # This will invoke the referenced subroutine directly, as |
804 | # $subref->($tr, $data); |
805 | $tr->producer(\&my_producer); |
806 | |
807 | There is also a method named B<producer_type>, which is a string |
808 | containing the classname to which the above B<produce> function |
809 | belongs. In the case of anonymous subroutines, this method returns |
810 | the string "CODE". |
811 | |
812 | Finally, there is a method named B<producer_args>, which is both an |
813 | accessor and a mutator. Arbitrary data may be stored in name => value |
814 | pairs for the producer subroutine to access: |
815 | |
816 | sub My::Random::producer { |
817 | my ($tr, $data) = @_; |
818 | my $pr_args = $tr->producer_args(); |
819 | |
820 | # $pr_args is a hashref. |
821 | |
822 | Extra data passed to the B<producer> method is passed to |
823 | B<producer_args>: |
824 | |
825 | $tr->producer("xSV", delimiter => ',\s*'); |
826 | |
827 | # In SQL::Translator::Producer::xSV: |
828 | my $args = $tr->producer_args; |
829 | my $delimiter = $args->{'delimiter'}; # value is ,\s* |
830 | |
831 | =head2 B<parser> |
832 | |
833 | The B<parser> method defines or retrieves a subroutine that will be |
834 | called to perform the parsing. The basic idea is the same as that of |
835 | B<producer> (see above), except the default subroutine name is |
ca251f03 |
836 | "parse", and will be invoked as C<$module_name::parse($tr, $data)>. |
0f3778d0 |
837 | Also, the parser subroutine will be passed a string containing the |
838 | entirety of the data to be parsed. |
839 | |
840 | # Invokes SQL::Translator::Parser::MySQL::parse() |
841 | $tr->parser("MySQL"); |
842 | |
843 | # Invokes My::Groovy::Parser::parse() |
844 | $tr->parser("My::Groovy::Parser"); |
845 | |
846 | # Invoke an anonymous subroutine directly |
847 | $tr->parser(sub { |
848 | my $dumper = Data::Dumper->new([ $_[1] ], [ "SQL" ]); |
849 | $dumper->Purity(1)->Terse(1)->Deepcopy(1); |
850 | return $dumper->Dump; |
851 | }); |
852 | |
853 | There is also B<parser_type> and B<parser_args>, which perform |
854 | analogously to B<producer_type> and B<producer_args> |
855 | |
856 | =head2 B<show_warnings> |
857 | |
858 | Toggles whether to print warnings of name conflicts, identifier |
859 | mutations, etc. Probably only generated by producers to let the user |
860 | know when something won't translate very smoothly (e.g., MySQL "enum" |
861 | fields into Oracle). Accepts a true or false value, returns the |
862 | current value. |
863 | |
864 | =head2 B<translate> |
865 | |
866 | The B<translate> method calls the subroutines referenced by the |
867 | B<parser> and B<producer> data members (described above). It accepts |
868 | as arguments a number of things, in key => value format, including |
869 | (potentially) a parser and a producer (they are passed directly to the |
870 | B<parser> and B<producer> methods). |
871 | |
872 | Here is how the parameter list to B<translate> is parsed: |
873 | |
874 | =over |
875 | |
876 | =item * |
877 | |
878 | 1 argument means it's the data to be parsed; which could be a string |
ca251f03 |
879 | (filename) or a reference to a scalar (a string stored in memory), or a |
0f3778d0 |
880 | reference to a hash, which is parsed as being more than one argument |
881 | (see next section). |
882 | |
883 | # Parse the file /path/to/datafile |
884 | my $output = $tr->translate("/path/to/datafile"); |
885 | |
886 | # Parse the data contained in the string $data |
887 | my $output = $tr->translate(\$data); |
888 | |
889 | =item * |
890 | |
891 | More than 1 argument means its a hash of things, and it might be |
892 | setting a parser, producer, or datasource (this key is named |
893 | "filename" or "file" if it's a file, or "data" for a SCALAR reference. |
894 | |
895 | # As above, parse /path/to/datafile, but with different producers |
896 | for my $prod ("MySQL", "XML", "Sybase") { |
897 | print $tr->translate( |
898 | producer => $prod, |
899 | filename => "/path/to/datafile", |
900 | ); |
901 | } |
902 | |
903 | # The filename hash key could also be: |
904 | datasource => \$data, |
905 | |
906 | You get the idea. |
907 | |
908 | =back |
909 | |
910 | =head2 B<filename>, B<data> |
911 | |
912 | Using the B<filename> method, the filename of the data to be parsed |
913 | can be set. This method can be used in conjunction with the B<data> |
914 | method, below. If both the B<filename> and B<data> methods are |
915 | invoked as mutators, the data set in the B<data> method is used. |
916 | |
917 | $tr->filename("/my/data/files/create.sql"); |
918 | |
919 | or: |
920 | |
921 | my $create_script = do { |
922 | local $/; |
923 | open CREATE, "/my/data/files/create.sql" or die $!; |
924 | <CREATE>; |
925 | }; |
926 | $tr->data(\$create_script); |
927 | |
928 | B<filename> takes a string, which is interpreted as a filename. |
929 | B<data> takes a reference to a string, which is used as the data to be |
930 | parsed. If a filename is set, then that file is opened and read when |
931 | the B<translate> method is called, as long as the data instance |
932 | variable is not set. |
933 | |
934 | =pod |
935 | |
936 | =head2 B<trace> |
937 | |
938 | Turns on/off the tracing option of Parse::RecDescent. |
939 | |
49e1eb70 |
940 | =pod |
941 | |
7a8e1f51 |
942 | =head1 AUTHORS |
16dc9970 |
943 | |
ca251f03 |
944 | Ken Y. Clark, E<lt>kclark@cpan.orgE<gt>, |
945 | darren chamberlain E<lt>darren@cpan.orgE<gt>, |
946 | Chris Mungall E<lt>cjm@fruitfly.orgE<gt>, |
947 | Allen Day E<lt>allenday@users.sourceforge.netE<gt> |
dfb4c915 |
948 | |
ca10f295 |
949 | =head1 COPYRIGHT |
16dc9970 |
950 | |
ca10f295 |
951 | This program is free software; you can redistribute it and/or modify |
952 | it under the terms of the GNU General Public License as published by |
953 | the Free Software Foundation; version 2. |
dfb4c915 |
954 | |
ca10f295 |
955 | This program is distributed in the hope that it will be useful, but |
956 | WITHOUT ANY WARRANTY; without even the implied warranty of |
957 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
958 | General Public License for more details. |
16dc9970 |
959 | |
ca10f295 |
960 | You should have received a copy of the GNU General Public License |
961 | along with this program; if not, write to the Free Software |
962 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
963 | USA |
16dc9970 |
964 | |
87bf8a3a |
965 | =head1 BUGS |
966 | |
967 | Please use http://rt.cpan.org/ for reporting bugs. |
968 | |
16dc9970 |
969 | =head1 SEE ALSO |
970 | |
abfa405a |
971 | L<perl>, |
972 | L<SQL::Translator::Parser>, |
973 | L<SQL::Translator::Producer>, |
974 | L<Parse::RecDescent> |
16dc9970 |
975 | |