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1 | package SQL::Translator; |
2 | |
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3 | # ---------------------------------------------------------------------- |
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4 | # $Id: Translator.pm,v 1.10 2002-11-20 04:03:03 kycl4rk Exp $ |
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5 | # ---------------------------------------------------------------------- |
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6 | # Copyright (C) 2002 Ken Y. Clark <kycl4rk@users.sourceforge.net>, |
7 | # darren chamberlain <darren@cpan.org> |
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8 | # |
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9 | # This program is free software; you can redistribute it and/or |
10 | # modify it under the terms of the GNU General Public License as |
11 | # published by the Free Software Foundation; version 2. |
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12 | # |
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13 | # This program is distributed in the hope that it will be useful, but |
14 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | # General Public License for more details. |
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17 | # |
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18 | # You should have received a copy of the GNU General Public License |
19 | # along with this program; if not, write to the Free Software |
20 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
21 | # 02111-1307 USA |
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22 | # ------------------------------------------------------------------- |
23 | |
24 | =head1 NAME |
25 | |
26 | SQL::Translator - convert schema from one database to another |
27 | |
28 | =head1 SYNOPSIS |
29 | |
30 | use SQL::Translator; |
31 | my $translator = SQL::Translator->new; |
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32 | my $output = $translator->translate( |
33 | from => "MySQL", |
34 | to => "Oracle", |
35 | filename => $file, |
36 | ) or die $translator->error; |
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37 | print $output; |
38 | |
39 | =head1 DESCRIPTION |
40 | |
41 | This module attempts to simplify the task of converting one database |
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42 | create syntax to another through the use of Parsers (which understand |
43 | the sourced format) and Producers (which understand the destination |
44 | format). The idea is that any Parser can be used with any Producer in |
45 | the conversion process. So, if you wanted PostgreSQL-to-Oracle, you |
46 | would use the PostgreSQL parser and the Oracle producer. |
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47 | |
48 | =cut |
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49 | |
50 | use strict; |
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51 | use vars qw( $VERSION $DEFAULT_SUB $DEBUG $ERROR ); |
52 | use base 'Class::Base'; |
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53 | |
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54 | $VERSION = sprintf "%d.%02d", q$Revision: 1.10 $ =~ /(\d+)\.(\d+)/; |
55 | $DEBUG = 0 unless defined $DEBUG; |
56 | $ERROR = ""; |
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57 | |
58 | use Carp qw(carp); |
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59 | |
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60 | # ---------------------------------------------------------------------- |
61 | # The default behavior is to "pass through" values (note that the |
62 | # SQL::Translator instance is the first value ($_[0]), and the stuff |
63 | # to be parsed is the second value ($_[1]) |
64 | # ---------------------------------------------------------------------- |
65 | $DEFAULT_SUB = sub { $_[1] } unless defined $DEFAULT_SUB; |
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66 | |
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67 | =head1 CONSTRUCTOR |
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68 | |
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69 | The constructor is called B<new>, and accepts a optional hash of options. |
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70 | Valid options are: |
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71 | |
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72 | =over 4 |
73 | |
74 | =item parser (aka from) |
75 | |
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76 | =item parser_args |
77 | |
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78 | =item producer (aka to) |
79 | |
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80 | =item producer_args |
81 | |
82 | =item filename (aka file) |
83 | |
84 | =item data |
85 | |
86 | =item debug |
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87 | |
88 | =back |
89 | |
90 | All options are, well, optional; these attributes can be set via |
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91 | instance methods. Internally, they are; no (non-syntactical) |
92 | advantage is gained by passing options to the constructor. |
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93 | |
94 | =cut |
95 | |
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96 | # ---------------------------------------------------------------------- |
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97 | # init([ARGS]) |
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98 | # The constructor. |
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99 | # |
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100 | # new takes an optional hash of arguments. These arguments may |
101 | # include a parser, specified with the keys "parser" or "from", |
102 | # and a producer, specified with the keys "producer" or "to". |
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103 | # |
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104 | # The values that can be passed as the parser or producer are |
105 | # given directly to the parser or producer methods, respectively. |
106 | # See the appropriate method description below for details about |
107 | # what each expects/accepts. |
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108 | # ---------------------------------------------------------------------- |
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109 | sub init { |
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110 | my ( $self, $config ) = @_; |
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111 | |
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112 | # |
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113 | # Set the parser and producer. |
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114 | # |
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115 | # If a 'parser' or 'from' parameter is passed in, use that as the |
116 | # parser; if a 'producer' or 'to' parameter is passed in, use that |
117 | # as the producer; both default to $DEFAULT_SUB. |
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118 | # |
119 | $self->parser ($config->{'parser'} || $config->{'from'} || $DEFAULT_SUB); |
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120 | $self->producer($config->{'producer'} || $config->{'to'} || $DEFAULT_SUB); |
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121 | |
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122 | # |
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123 | # Set the parser_args and producer_args |
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124 | # |
125 | for my $pargs ( qw[ parser_args producer_args ] ) { |
126 | $self->$pargs( $config->{$pargs} ) if defined $config->{ $pargs }; |
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127 | } |
128 | |
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129 | # |
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130 | # Set the data source, if 'filename' or 'file' is provided. |
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131 | # |
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132 | $config->{'filename'} ||= $config->{'file'} || ""; |
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133 | $self->filename( $config->{'filename'} ) if $config->{'filename'}; |
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134 | |
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135 | # |
136 | # Finally, if there is a 'data' parameter, use that in |
137 | # preference to filename and file |
138 | # |
139 | if ( my $data = $config->{'data'} ) { |
140 | $self->data( $data ); |
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141 | } |
142 | |
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143 | $self->{'debug'} = defined $config->{'debug'} ? $config->{'debug'} : $DEBUG; |
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144 | |
145 | return $self; |
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146 | } |
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147 | |
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148 | =head1 METHODS |
149 | |
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150 | =head2 B<producer> |
151 | |
152 | The B<producer> method is an accessor/mutator, used to retrieve or |
153 | define what subroutine is called to produce the output. A subroutine |
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154 | defined as a producer will be invoked as a function (not a method) and |
155 | passed 2 parameters: its container SQL::Translator instance and a |
156 | data structure. It is expected that the function transform the data |
157 | structure to a string. The SQL::Transformer instance is provided for |
158 | informational purposes; for example, the type of the parser can be |
159 | retrieved using the B<parser_type> method, and the B<error> and |
160 | B<debug> methods can be called when needed. |
161 | |
162 | When defining a producer, one of several things can be passed |
163 | in: A module name (e.g., My::Groovy::Producer), a module name |
164 | relative to the SQL::Translator::Producer namespace (e.g., MySQL), a |
165 | module name and function combination (My::Groovy::Producer::transmogrify), |
166 | or a reference to an anonymous subroutine. If a full module name is |
167 | passed in (for the purposes of this method, a string containing "::" |
168 | is considered to be a module name), it is treated as a package, and a |
169 | function called "produce" will be invoked: $modulename::produce. If |
170 | $modulename cannot be loaded, the final portion is stripped off and |
171 | treated as a function. In other words, if there is no file named |
172 | My/Groovy/Producer/transmogrify.pm, SQL::Translator will attempt to load |
173 | My/Groovy/Producer.pm and use transmogrify as the name of the function, |
174 | instead of the default "produce". |
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175 | |
176 | my $tr = SQL::Translator->new; |
177 | |
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178 | # This will invoke My::Groovy::Producer::produce($tr, $data) |
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179 | $tr->producer("My::Groovy::Producer"); |
180 | |
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181 | # This will invoke SQL::Translator::Producer::Sybase::produce($tr, $data) |
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182 | $tr->producer("Sybase"); |
183 | |
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184 | # This will invoke My::Groovy::Producer::transmogrify($tr, $data), |
185 | # assuming that My::Groovy::Producer::transmogrify is not a module |
186 | # on disk. |
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187 | $tr->producer("My::Groovy::Producer::transmogrify"); |
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188 | |
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189 | # This will invoke the referenced subroutine directly, as |
190 | # $subref->($tr, $data); |
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191 | $tr->producer(\&my_producer); |
192 | |
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193 | There is also a method named B<producer_type>, which is a string |
194 | containing the classname to which the above B<produce> function |
195 | belongs. In the case of anonymous subroutines, this method returns |
196 | the string "CODE". |
197 | |
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198 | Finally, there is a method named B<producer_args>, which is both an |
199 | accessor and a mutator. Arbitrary data may be stored in name => value |
200 | pairs for the producer subroutine to access: |
201 | |
202 | sub My::Random::producer { |
203 | my ($tr, $data) = @_; |
204 | my $pr_args = $tr->producer_args(); |
205 | |
206 | # $pr_args is a hashref. |
207 | |
208 | Extra data passed to the B<producer> method is passed to |
209 | B<producer_args>: |
210 | |
211 | $tr->producer("xSV", delimiter => ',\s*'); |
212 | |
213 | # In SQL::Translator::Producer::xSV: |
214 | my $args = $tr->producer_args; |
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215 | my $delimiter = $args->{'delimiter'}; # value is ,\s* |
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216 | |
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217 | =cut |
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218 | |
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219 | # producer and producer_type |
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220 | sub producer { |
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221 | my $self = shift; |
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222 | |
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223 | # producer as a mutator |
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224 | if (@_) { |
225 | my $producer = shift; |
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226 | |
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227 | # Passed a module name (string containing "::") |
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228 | if ($producer =~ /::/) { |
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229 | my $func_name; |
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230 | |
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231 | # Module name was passed directly |
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232 | # We try to load the name; if it doesn't load, there's |
233 | # a possibility that it has a function name attached to |
234 | # it. |
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235 | if (load($producer)) { |
236 | $func_name = "produce"; |
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237 | } |
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238 | |
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239 | # Module::function was passed |
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240 | else { |
241 | # Passed Module::Name::function; try to recover |
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242 | my @func_parts = split /::/, $producer; |
243 | $func_name = pop @func_parts; |
244 | $producer = join "::", @func_parts; |
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245 | |
246 | # If this doesn't work, then we have a legitimate |
247 | # problem. |
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248 | load($producer) or die "Can't load $producer: $@"; |
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249 | } |
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250 | |
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251 | # get code reference and assign |
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252 | $self->{'producer'} = \&{ "$producer\::$func_name" }; |
253 | $self->{'producer_type'} = $producer; |
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254 | $self->debug("Got producer: $producer\::$func_name\n"); |
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255 | } |
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256 | |
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257 | # passed an anonymous subroutine reference |
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258 | elsif (isa($producer, 'CODE')) { |
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259 | $self->{'producer'} = $producer; |
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260 | $self->{'producer_type'} = "CODE"; |
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261 | $self->debug("Got producer: code ref\n"); |
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262 | } |
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263 | |
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264 | # passed a string containing no "::"; relative package name |
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265 | else { |
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266 | my $Pp = sprintf "SQL::Translator::Producer::$producer"; |
267 | load($Pp) or die "Can't load $Pp: $@"; |
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268 | $self->{'producer'} = \&{ "$Pp\::produce" }; |
269 | $self->{'producer_type'} = $Pp; |
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270 | $self->debug("Got producer: $Pp\n"); |
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271 | } |
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272 | |
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273 | # At this point, $self->{'producer'} contains a subroutine |
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274 | # reference that is ready to run |
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275 | |
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276 | # Anything left? If so, it's producer_args |
277 | $self->producer_args(@_) if (@_); |
278 | } |
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279 | |
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280 | return $self->{'producer'}; |
281 | }; |
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282 | |
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283 | # ---------------------------------------------------------------------- |
284 | # producer_type |
285 | # |
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286 | # producer_type is an accessor that allows producer subs to get |
287 | # information about their origin. This is poptentially important; |
288 | # since all producer subs are called as subroutine refernces, there is |
289 | # no way for a producer to find out which package the sub lives in |
290 | # originally, for example. |
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291 | # ---------------------------------------------------------------------- |
292 | sub producer_type { $_[0]->{'producer_type'} } |
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293 | |
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294 | # ---------------------------------------------------------------------- |
295 | # producer_args |
296 | # |
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297 | # Arbitrary name => value pairs of paramters can be passed to a |
298 | # producer using this method. |
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299 | # ---------------------------------------------------------------------- |
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300 | sub producer_args { |
301 | my $self = shift; |
302 | if (@_) { |
303 | my $args = isa($_[0], 'HASH') ? shift : { @_ }; |
304 | $self->{'producer_args'} = $args; |
305 | } |
306 | $self->{'producer_args'}; |
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307 | } |
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308 | |
309 | =head2 B<parser> |
310 | |
311 | The B<parser> method defines or retrieves a subroutine that will be |
312 | called to perform the parsing. The basic idea is the same as that of |
313 | B<producer> (see above), except the default subroutine name is |
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314 | "parse", and will be invoked as $module_name::parse($tr, $data). |
315 | Also, the parser subroutine will be passed a string containing the |
316 | entirety of the data to be parsed (or possibly a reference to a string?). |
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317 | |
318 | # Invokes SQL::Translator::Parser::MySQL::parse() |
319 | $tr->parser("MySQL"); |
320 | |
321 | # Invokes My::Groovy::Parser::parse() |
322 | $tr->parser("My::Groovy::Parser"); |
323 | |
324 | # Invoke an anonymous subroutine directly |
325 | $tr->parser(sub { |
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326 | my $dumper = Data::Dumper->new([ $_[1] ], [ "SQL" ]); |
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327 | $dumper->Purity(1)->Terse(1)->Deepcopy(1); |
328 | return $dumper->Dump; |
329 | }); |
330 | |
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331 | There is also B<parser_type> and B<parser_args>, which perform |
332 | analogously to B<producer_type> and B<producer_args> |
333 | |
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334 | =cut |
335 | |
ca10f295 |
336 | sub parser { |
337 | my $self = shift; |
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338 | |
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339 | # parser as a mutator |
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340 | if (@_) { |
341 | my $parser = shift; |
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342 | |
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343 | # Passed a module name (string containing "::") |
ca10f295 |
344 | if ($parser =~ /::/) { |
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345 | my $func_name; |
346 | |
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347 | # Module name was passed directly |
b346d8f1 |
348 | # We try to load the name; if it doesn't load, there's |
349 | # a possibility that it has a function name attached to |
350 | # it. |
351 | if (load($parser)) { |
352 | $func_name = "parse"; |
7a8e1f51 |
353 | } |
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354 | |
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355 | # Module::function was passed |
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356 | else { |
357 | # Passed Module::Name::function; try to recover |
358 | my @func_parts = split /::/, $parser; |
359 | $func_name = pop @func_parts; |
360 | $parser = join "::", @func_parts; |
361 | |
362 | # If this doesn't work, then we have a legitimate |
363 | # problem. |
364 | load($parser) or die "Can't load $parser: $@"; |
7a8e1f51 |
365 | } |
b346d8f1 |
366 | |
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367 | # get code reference and assign |
b346d8f1 |
368 | $self->{'parser'} = \&{ "$parser\::$func_name" }; |
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369 | $self->{'parser_type'} = $parser; |
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370 | $self->debug("Got parser: $parser\::$func_name\n"); |
7a8e1f51 |
371 | } |
b346d8f1 |
372 | |
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373 | # passed an anonymous subroutine reference |
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374 | elsif ( isa( $parser, 'CODE' ) ) { |
375 | $self->{'parser'} = $parser; |
077ebf34 |
376 | $self->{'parser_type'} = "CODE"; |
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377 | $self->debug("Got parser: code ref\n"); |
7a8e1f51 |
378 | } |
b346d8f1 |
379 | |
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380 | # passed a string containing no "::"; relative package name |
b346d8f1 |
381 | else { |
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382 | my $Pp = "SQL::Translator::Parser::$parser"; |
383 | load( $Pp ) or die "Can't load $Pp: $@"; |
384 | $self->{'parser'} = \&{ "$Pp\::parse" }; |
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385 | $self->{'parser_type'} = $Pp; |
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386 | $self->debug("Got parser: $Pp\n"); |
7a8e1f51 |
387 | } |
b346d8f1 |
388 | |
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389 | # |
b346d8f1 |
390 | # At this point, $self->{'parser'} contains a subroutine |
391 | # reference that is ready to run |
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392 | # |
393 | $self->parser_args( @_ ) if (@_); |
7a8e1f51 |
394 | } |
b346d8f1 |
395 | |
ca10f295 |
396 | return $self->{'parser'}; |
16dc9970 |
397 | } |
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398 | |
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399 | sub parser_type { $_[0]->{'parser_type'} } |
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400 | |
7a8e1f51 |
401 | # parser_args |
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402 | sub parser_args { |
403 | my $self = shift; |
404 | if (@_) { |
405 | my $args = isa($_[0], 'HASH') ? shift : { @_ }; |
406 | $self->{'parser_args'} = $args; |
407 | } |
408 | $self->{'parser_args'}; |
7a8e1f51 |
409 | } |
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410 | |
ca10f295 |
411 | =head2 B<translate> |
412 | |
413 | The B<translate> method calls the subroutines referenced by the |
414 | B<parser> and B<producer> data members (described above). It accepts |
415 | as arguments a number of things, in key => value format, including |
416 | (potentially) a parser and a producer (they are passed directly to the |
417 | B<parser> and B<producer> methods). |
418 | |
419 | Here is how the parameter list to B<translate> is parsed: |
420 | |
421 | =over |
422 | |
423 | =item * |
424 | |
425 | 1 argument means it's the data to be parsed; which could be a string |
b346d8f1 |
426 | (filename) or a refernce to a scalar (a string stored in memory), or a |
427 | reference to a hash, which is parsed as being more than one argument |
428 | (see next section). |
ca10f295 |
429 | |
430 | # Parse the file /path/to/datafile |
431 | my $output = $tr->translate("/path/to/datafile"); |
432 | |
b346d8f1 |
433 | # Parse the data contained in the string $data |
ca10f295 |
434 | my $output = $tr->translate(\$data); |
435 | |
436 | =item * |
437 | |
077ebf34 |
438 | More than 1 argument means its a hash of things, and it might be |
439 | setting a parser, producer, or datasource (this key is named |
b346d8f1 |
440 | "filename" or "file" if it's a file, or "data" for a SCALAR reference. |
ca10f295 |
441 | |
442 | # As above, parse /path/to/datafile, but with different producers |
443 | for my $prod ("MySQL", "XML", "Sybase") { |
444 | print $tr->translate( |
445 | producer => $prod, |
446 | filename => "/path/to/datafile", |
447 | ); |
448 | } |
449 | |
450 | # The filename hash key could also be: |
ca10f295 |
451 | datasource => \$data, |
452 | |
453 | You get the idea. |
454 | |
455 | =back |
456 | |
9398955f |
457 | =head2 B<filename>, B<data> |
458 | |
459 | Using the B<filename> method, the filename of the data to be parsed |
460 | can be set. This method can be used in conjunction with the B<data> |
461 | method, below. If both the B<filename> and B<data> methods are |
462 | invoked as mutators, the data set in the B<data> method is used. |
463 | |
464 | $tr->filename("/my/data/files/create.sql"); |
465 | |
466 | or: |
467 | |
468 | my $create_script = do { |
469 | local $/; |
470 | open CREATE, "/my/data/files/create.sql" or die $!; |
471 | <CREATE>; |
472 | }; |
473 | $tr->data(\$create_script); |
474 | |
475 | B<filename> takes a string, which is interpreted as a filename. |
38254289 |
476 | B<data> takes a reference to a string, which is used as the data to be |
9398955f |
477 | parsed. If a filename is set, then that file is opened and read when |
478 | the B<translate> method is called, as long as the data instance |
479 | variable is not set. |
480 | |
ca10f295 |
481 | =cut |
482 | |
7a8e1f51 |
483 | # filename - get or set the filename |
9398955f |
484 | sub filename { |
485 | my $self = shift; |
486 | if (@_) { |
7a8e1f51 |
487 | my $filename = shift; |
488 | if (-d $filename) { |
489 | my $msg = "Cannot use directory '$filename' as input source"; |
c2d3a526 |
490 | return $self->error($msg); |
7a8e1f51 |
491 | } elsif (-f _ && -r _) { |
492 | $self->{'filename'} = $filename; |
49e1eb70 |
493 | $self->debug("Got filename: '$self->{'filename'}'\n"); |
7a8e1f51 |
494 | } else { |
495 | my $msg = "Cannot use '$filename' as input source: ". |
496 | "file does not exist or is not readable."; |
c2d3a526 |
497 | return $self->error($msg); |
7a8e1f51 |
498 | } |
9398955f |
499 | } |
7a8e1f51 |
500 | |
9398955f |
501 | $self->{'filename'}; |
7a8e1f51 |
502 | } |
9398955f |
503 | |
7a8e1f51 |
504 | # data - get or set the data |
9398955f |
505 | # if $self->{'data'} is not set, but $self->{'filename'} is, then |
506 | # $self->{'filename'} is opened and read, whith the results put into |
507 | # $self->{'data'}. |
508 | sub data { |
509 | my $self = shift; |
510 | |
7a8e1f51 |
511 | # Set $self->{'data'} to $_[0], if it is provided. |
9398955f |
512 | if (@_) { |
513 | my $data = shift; |
514 | if (isa($data, "SCALAR")) { |
515 | $self->{'data'} = $data; |
516 | } |
517 | elsif (! ref $data) { |
518 | $self->{'data'} = \$data; |
519 | } |
520 | } |
9398955f |
521 | |
7a8e1f51 |
522 | # If we have a filename but no data yet, populate. |
9398955f |
523 | if (not $self->{'data'} and my $filename = $self->filename) { |
49e1eb70 |
524 | $self->debug("Opening '$filename' to get contents.\n"); |
9398955f |
525 | local *FH; |
526 | local $/; |
527 | my $data; |
528 | |
529 | unless (open FH, $filename) { |
49e1eb70 |
530 | return $self->error("Can't read file '$filename': $!"); |
9398955f |
531 | } |
532 | |
533 | $data = <FH>; |
534 | $self->{'data'} = \$data; |
535 | |
536 | unless (close FH) { |
49e1eb70 |
537 | return $self->error("Can't close file '$filename': $!"); |
9398955f |
538 | } |
539 | } |
9398955f |
540 | |
541 | return $self->{'data'}; |
7a8e1f51 |
542 | } |
9398955f |
543 | |
7a8e1f51 |
544 | # translate |
16dc9970 |
545 | sub translate { |
ca10f295 |
546 | my $self = shift; |
7a8e1f51 |
547 | my ($args, $parser, $parser_type, $producer, $producer_type); |
548 | my ($parser_output, $producer_output); |
ca10f295 |
549 | |
7a8e1f51 |
550 | # Parse arguments |
9398955f |
551 | if (@_ == 1) { |
7a8e1f51 |
552 | # Passed a reference to a hash? |
ca10f295 |
553 | if (isa($_[0], 'HASH')) { |
7a8e1f51 |
554 | # yep, a hashref |
49e1eb70 |
555 | $self->debug("translate: Got a hashref\n"); |
ca10f295 |
556 | $args = $_[0]; |
557 | } |
9398955f |
558 | |
7a8e1f51 |
559 | # Passed a reference to a string containing the data |
ca10f295 |
560 | elsif (isa($_[0], 'SCALAR')) { |
9398955f |
561 | # passed a ref to a string |
49e1eb70 |
562 | $self->debug("translate: Got a SCALAR reference (string)\n"); |
9398955f |
563 | $self->data($_[0]); |
ca10f295 |
564 | } |
9398955f |
565 | |
7a8e1f51 |
566 | # Not a reference; treat it as a filename |
b346d8f1 |
567 | elsif (! ref $_[0]) { |
ca10f295 |
568 | # Not a ref, it's a filename |
49e1eb70 |
569 | $self->debug("translate: Got a filename\n"); |
9398955f |
570 | $self->filename($_[0]); |
ca10f295 |
571 | } |
9398955f |
572 | |
7a8e1f51 |
573 | # Passed something else entirely. |
b346d8f1 |
574 | else { |
575 | # We're not impressed. Take your empty string and leave. |
38254289 |
576 | # return ""; |
577 | |
7a8e1f51 |
578 | # Actually, if data, parser, and producer are set, then we |
579 | # can continue. Too bad, because I like my comment |
580 | # (above)... |
38254289 |
581 | return "" unless ($self->data && |
582 | $self->producer && |
583 | $self->parser); |
b346d8f1 |
584 | } |
16dc9970 |
585 | } |
586 | else { |
b346d8f1 |
587 | # You must pass in a hash, or you get nothing. |
588 | return "" if @_ % 2; |
ca10f295 |
589 | $args = { @_ }; |
7a8e1f51 |
590 | } |
16dc9970 |
591 | |
9398955f |
592 | # ---------------------------------------------------------------------- |
593 | # Can specify the data to be transformed using "filename", "file", |
7a8e1f51 |
594 | # "data", or "datasource". |
9398955f |
595 | # ---------------------------------------------------------------------- |
7a8e1f51 |
596 | if (my $filename = ($args->{'filename'} || $args->{'file'})) { |
9398955f |
597 | $self->filename($filename); |
598 | } |
ca10f295 |
599 | |
7a8e1f51 |
600 | if (my $data = ($self->{'data'} || $self->{'datasource'})) { |
9398955f |
601 | $self->data($data); |
16dc9970 |
602 | } |
ca10f295 |
603 | |
9398955f |
604 | # ---------------------------------------------------------------- |
605 | # Get the data. |
606 | # ---------------------------------------------------------------- |
607 | my $data = $self->data; |
7a8e1f51 |
608 | unless (length $$data) { |
c2d3a526 |
609 | return $self->error("Empty data file!"); |
9398955f |
610 | } |
077ebf34 |
611 | |
9398955f |
612 | # ---------------------------------------------------------------- |
ca10f295 |
613 | # Local reference to the parser subroutine |
9398955f |
614 | # ---------------------------------------------------------------- |
ca10f295 |
615 | if ($parser = ($args->{'parser'} || $args->{'from'})) { |
616 | $self->parser($parser); |
16dc9970 |
617 | } |
7a8e1f51 |
618 | $parser = $self->parser; |
619 | $parser_type = $self->parser_type; |
16dc9970 |
620 | |
9398955f |
621 | # ---------------------------------------------------------------- |
ca10f295 |
622 | # Local reference to the producer subroutine |
9398955f |
623 | # ---------------------------------------------------------------- |
ca10f295 |
624 | if ($producer = ($args->{'producer'} || $args->{'to'})) { |
625 | $self->producer($producer); |
16dc9970 |
626 | } |
7a8e1f51 |
627 | $producer = $self->producer; |
628 | $producer_type = $self->producer_type; |
16dc9970 |
629 | |
9398955f |
630 | # ---------------------------------------------------------------- |
7a8e1f51 |
631 | # Execute the parser, then execute the producer with that output. |
632 | # Allowances are made for each piece to die, or fail to compile, |
633 | # since the referenced subroutines could be almost anything. In |
634 | # the future, each of these might happen in a Safe environment, |
635 | # depending on how paranoid we want to be. |
9398955f |
636 | # ---------------------------------------------------------------- |
7a8e1f51 |
637 | eval { $parser_output = $parser->($self, $$data) }; |
638 | if ($@ || ! $parser_output) { |
639 | my $msg = sprintf "translate: Error with parser '%s': %s", |
640 | $parser_type, ($@) ? $@ : " no results"; |
c2d3a526 |
641 | return $self->error($msg); |
7a8e1f51 |
642 | } |
643 | |
644 | eval { $producer_output = $producer->($self, $parser_output) }; |
645 | if ($@ || ! $producer_output) { |
646 | my $msg = sprintf "translate: Error with producer '%s': %s", |
647 | $producer_type, ($@) ? $@ : " no results"; |
c2d3a526 |
648 | return $self->error($msg); |
7a8e1f51 |
649 | } |
650 | |
651 | return $producer_output; |
16dc9970 |
652 | } |
ca10f295 |
653 | |
ca10f295 |
654 | sub load { |
655 | my $module = do { my $m = shift; $m =~ s[::][/]g; "$m.pm" }; |
656 | return 1 if $INC{$module}; |
657 | |
658 | eval { require $module }; |
659 | |
660 | return if ($@); |
661 | return 1; |
1fd8c91f |
662 | } |
16dc9970 |
663 | |
c2d3a526 |
664 | sub isa { UNIVERSAL::isa($_[0], $_[1]) } |
665 | |
16dc9970 |
666 | 1; |
667 | |
668 | #----------------------------------------------------- |
669 | # Rescue the drowning and tie your shoestrings. |
670 | # Henry David Thoreau |
671 | #----------------------------------------------------- |
672 | |
49e1eb70 |
673 | =pod |
674 | |
7a8e1f51 |
675 | =head1 AUTHORS |
16dc9970 |
676 | |
ca10f295 |
677 | Ken Y. Clark, E<lt>kclark@logsoft.comE<gt>, |
678 | darren chamberlain E<lt>darren@cpan.orgE<gt> |
dfb4c915 |
679 | |
ca10f295 |
680 | =head1 COPYRIGHT |
16dc9970 |
681 | |
ca10f295 |
682 | This program is free software; you can redistribute it and/or modify |
683 | it under the terms of the GNU General Public License as published by |
684 | the Free Software Foundation; version 2. |
dfb4c915 |
685 | |
ca10f295 |
686 | This program is distributed in the hope that it will be useful, but |
687 | WITHOUT ANY WARRANTY; without even the implied warranty of |
688 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
689 | General Public License for more details. |
16dc9970 |
690 | |
ca10f295 |
691 | You should have received a copy of the GNU General Public License |
692 | along with this program; if not, write to the Free Software |
693 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
694 | USA |
16dc9970 |
695 | |
696 | =head1 SEE ALSO |
697 | |
ca10f295 |
698 | L<perl>, L<Parse::RecDescent> |
16dc9970 |
699 | |
700 | =cut |