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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "TRELoad 3" | |
132 | .TH TRELoad 3 "2003-04-16" "perl v5.8.0" "User Contributed Perl Documentation" | |
133 | .SH "NAME" | |
134 | TRELoad \- Perl extension for loading modules under TRE control | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | .Vb 3 | |
138 | \& use TRELoad 'Foo' => ['abc', 'def'], | |
139 | \& 'Bar', | |
140 | \& 'Baz' => [ '$somevar' ]; | |
141 | .Ve | |
142 | .PP | |
143 | .Vb 1 | |
144 | \& which is the same as | |
145 | .Ve | |
146 | .PP | |
147 | .Vb 3 | |
148 | \& use Foo 'abc', 'def'; | |
149 | \& use Bar; | |
150 | \& use Baz '$somevar'; | |
151 | .Ve | |
152 | .SH "ABSTRACT" | |
153 | .IX Header "ABSTRACT" | |
154 | .Vb 5 | |
155 | \& This module adds a layer of indirection between modules under | |
156 | \& TRE control and the scripts/modules that use them. It allows | |
157 | \& the TRE-controlled modules to be intstalled unmodified. TRELoad | |
158 | \& emulates the Exporter, so client modules are able to import | |
159 | \& symbols from the TRE modules. | |
160 | .Ve | |
161 | .SH "DESCRIPTION" | |
162 | .IX Header "DESCRIPTION" | |
163 | The TRELoad module exists as a layer of indirection between perl | |
164 | modules under \s-1TRE\s0 control and scripts/modules that use them. The | |
165 | basic idea is that we want to use \s-1TRE\s0 mechanisms to find perl modules, | |
166 | rather than the include mechanisms built into perl. That said, we | |
167 | want to support arbitrary perl modules and fully export the perl | |
168 | exporter. | |
169 | .Sh "\s-1USING\s0 A \s-1TRE\s0 \s-1MODULE\s0" | |
170 | .IX Subsection "USING A TRE MODULE" | |
171 | The entire usage for the TRELoad module is the 'use' line. The syntax is: | |
172 | .PP | |
173 | .Vb 1 | |
174 | \& use TRELoad <list>; | |
175 | .Ve | |
176 | .PP | |
177 | In its simplest (and most common) usage, the list contains the names | |
178 | of modules to import. For instance, the \s-1TRE\s0 equivalent of: | |
179 | .PP | |
180 | .Vb 2 | |
181 | \& use Foo; | |
182 | \& use Bar; | |
183 | .Ve | |
184 | .PP | |
185 | is | |
186 | .PP | |
187 | .Vb 1 | |
188 | \& use TRELoad 'Foo', 'Bar'; | |
189 | .Ve | |
190 | .PP | |
191 | With this syntax (i.e., no import list explicitly defined for the | |
192 | modules), you import symbols in the default export list, just as you | |
193 | would with the bare 'use' directives. | |
194 | .PP | |
195 | A normal use directive can also contain a list of symbols to import, | |
196 | which override the default export list of the module. For instance: | |
197 | .PP | |
198 | .Vb 1 | |
199 | \& use Foo 'abc', 'def'; | |
200 | .Ve | |
201 | .PP | |
202 | will load the Foo module and import the symbols 'abc' and 'def' | |
203 | instead of the default export list. The TRELoad equivalent is to use | |
204 | an array reference immediately following the module name in the | |
205 | TRELoad argument list. The above TRELoad equivalent would be: | |
206 | .PP | |
207 | .Vb 1 | |
208 | \& use TRELoad 'Foo' => ['abc', 'def']; | |
209 | .Ve | |
210 | .PP | |
211 | The perl exporter also supports tags (pseudo\-symbols starting with | |
212 | \&':'), which are names for lists of symbols. There is a predefined tag | |
213 | called ':DEFAULT' which contains all of the symbols in the default | |
214 | export list. These tags are also supported by TRELoad. Therefore, | |
215 | the following statement: | |
216 | .PP | |
217 | .Vb 1 | |
218 | \& use Foo ':DEFAULT', 'abc'; | |
219 | .Ve | |
220 | .PP | |
221 | has the \s-1TRE\s0 equivalent of: | |
222 | .PP | |
223 | .Vb 1 | |
224 | \& use TRELoad 'Foo' => [':DEFAULT', 'abc'] | |
225 | .Ve | |
226 | .PP | |
227 | which means to import all symbols in the default export list, plus the | |
228 | symbol 'abc'. | |
229 | .PP | |
230 | TRELoad also supports negations, see 'perldoc Exporter' for more | |
231 | details. As a more complicated example, consider: | |
232 | .PP | |
233 | .Vb 3 | |
234 | \& use Foo 'abc'; | |
235 | \& use Bar ':DEFAULT', 'aaa', '!bbb', '!:ccc'; | |
236 | \& use Baz; | |
237 | .Ve | |
238 | .PP | |
239 | This means, load Foo, Bar, and Baz. Import the symbol 'abc' from Foo, | |
240 | import all the default symbols from Bar, plus 'aaa', minus the symbol | |
241 | \&'bbb' and minus all symbols in the tag ':ccc'. Finally, import the | |
242 | symbols in the default export list from Baz. | |
243 | .PP | |
244 | The \s-1TRE\s0 equivalent is: | |
245 | .PP | |
246 | .Vb 3 | |
247 | \& use TRELoad 'Foo' => [ 'abc' ], | |
248 | \& 'Bar' => [ ':DEFAULT', 'aaa', '!bbb', '!:ccc'], | |
249 | \& 'Baz'; | |
250 | .Ve | |
251 | .PP | |
252 | I assume you get the idea. | |
253 | .Sh "\s-1OVERRIDING\s0 \s-1TRE_ENTRY\s0" | |
254 | .IX Subsection "OVERRIDING TRE_ENTRY" | |
255 | The TRELoad module obeys the \s-1TRE\s0 mechanism of appending tool paths to | |
256 | \&\s-1TRE_ENTRY\s0. It is possible, however, to override the \s-1TRE_ENTRY\s0 | |
257 | setting. To do this requires a more general syntax. Basically, | |
258 | whereever an array reference can appear in the usage list, you may | |
259 | substitute a hash reference. The legal keys of this hash are 'import' | |
260 | (whose value is an array reference that is treated as an import list) | |
261 | and 'tre_entry' (whose value is intrepreted as a string to use as a | |
262 | value for \s-1TRE_ENTRY\s0). | |
263 | .PP | |
264 | For example: | |
265 | .PP | |
266 | .Vb 1 | |
267 | \& use TRELoad 'Foo' => ['abc', 'def']; | |
268 | .Ve | |
269 | .PP | |
270 | and | |
271 | .PP | |
272 | .Vb 1 | |
273 | \& use TRELoad 'Foo' => { import => ['abc', 'def'] }; | |
274 | .Ve | |
275 | .PP | |
276 | are exactly identical. | |
277 | .PP | |
278 | .Vb 2 | |
279 | \& use TRELoad 'Foo' => { import => ['abc', 'def'], | |
280 | \& tre_entry => '/SomeTool' }; | |
281 | .Ve | |
282 | .PP | |
283 | is the same thing except that it will use the \s-1TRE_ENTRY\s0 of | |
284 | \&\*(L"/SomeTool\*(R". | |
285 | .Sh "\s-1INSTALLING\s0 A \s-1MODULE\s0" | |
286 | .IX Subsection "INSTALLING A MODULE" | |
287 | Modules are installed using the normal perl install mechanism. The | |
288 | only TRE-specific step is to override the default install prefix: | |
289 | .PP | |
290 | .Vb 5 | |
291 | \& make clean # if Makefile is already present | |
292 | \& perl Makefile.PL \e | |
293 | \& PREFIX=/import/bw/tools/release/perlmod/<module_name>/<version> | |
294 | \& make | |
295 | \& make install | |
296 | .Ve | |
297 | .PP | |
298 | If it is a new module, you will also need to add a .tver entry for the | |
299 | module name. | |
300 | .Sh "\s-1EXPORT\s0" | |
301 | .IX Subsection "EXPORT" | |
302 | None. | |
303 | .Sh "\s-1RESTRICTIONS\s0" | |
304 | .IX Subsection "RESTRICTIONS" | |
305 | There are couple of restrictions to be aware of: | |
306 | .IP "\(bu" 4 | |
307 | You cannot use pattern rules in an import list (i.e., import symbols | |
308 | that begin with '/' or '!/'. There is no reason this couldn't be made | |
309 | to work, but it's a fair amount of work and this feature is almost | |
310 | never used. | |
311 | .IP "\(bu" 4 | |
312 | You can only use TRELoad on a top-level module. For instance, if a | |
313 | module Foo contains a Foo.pm with interface code for the underlying | |
314 | modules Foo::Bar and Foo::Baz, you must use a \*(L"use TRELoad 'Foo'\*(R", | |
315 | since Foo::Bar and Foo::Baz will not be recognized by configsrch. If | |
316 | you need to use those modules directly (which usually is not a good | |
317 | idea), you can do: | |
318 | .Sp | |
319 | .Vb 3 | |
320 | \& use TRELoad 'Foo'; | |
321 | \& use Foo::Bar; | |
322 | \& use Foo::Baz; | |
323 | .Ve | |
324 | .Sp | |
325 | The TRELoad line will add the appropriate version of Foo to the | |
326 | include path, so you can just use a regular 'use' for its sub\-modules. | |
327 | .IP "\(bu" 4 | |
328 | Using a number to specify a minimum version is not supported (as in: | |
329 | \&\*(L"use Foo 3.01;\*(R") on the TRELoad 'use' line. You can get the effect, | |
330 | however, by using: | |
331 | .Sp | |
332 | .Vb 2 | |
333 | \& use TRELoad 'Foo'; | |
334 | \& use Foo 3.01; | |
335 | .Ve | |
336 | .Sp | |
337 | The TRELoad line will add the correct version of Foo to the include | |
338 | path, so the following line will work correctly. | |
339 | .IP "\(bu" 4 | |
340 | Use perl-style version numbers for your \s-1TRE\s0 versions. That is to say, | |
341 | use two decimal places after the '.'. The reason is that perl does a | |
342 | simple \s-1ASCII\s0 comparison when it compares version numbers, so it | |
343 | believes 1.9 to be more recent than 1.10. \s-1TRE\s0 does not care, but perl | |
344 | does, so if users want to check the version of the module (see | |
345 | previous bullet), this convention is required. | |
346 | .IP "\(bu" 4 | |
347 | You cannot load two different versions of a module in the same script. | |
348 | For instance, suppose you had a module called Abc and another module | |
349 | called Composite, where Composite itself used Abc. If your .tver file | |
350 | consisted of: | |
351 | .Sp | |
352 | .Vb 3 | |
353 | \& Abc / 1.01 | |
354 | \& Abc /Composite 1.02 | |
355 | \& Composite / 2.01 | |
356 | .Ve | |
357 | .Sp | |
358 | you would be able to use Abc by itself, and you would get version | |
359 | 1.01. You could use Composite by itself, which would get version 1.02 | |
360 | of Abc. What you cannot do is include Abc by itself \s-1AND\s0 from within | |
361 | Composite via something like: | |
362 | .Sp | |
363 | .Vb 1 | |
364 | \& use TRELoad 'Abc', 'Composite'; | |
365 | .Ve | |
366 | .Sp | |
367 | This is because it would try to load \s-1BOTH\s0 versions of 1.01 and 1.02 | |
368 | of Abc in the same interpreter, and the names would conflict. In this | |
369 | case, TRELoad prints a warning message to stderr and uses the first | |
370 | version loaded of the module in question. It is impossible to make | |
371 | this work without modifying the modules themselves, and the major | |
372 | design goal of TRELoad was to enable the \s-1TRE\s0 use of arbitrary perl | |
373 | modules. | |
374 | .SH "SEE ALSO" | |
375 | .IX Header "SEE ALSO" | |
376 | .Vb 2 | |
377 | \& perlmod(1), Exporter(3), | |
378 | \& http://ppgweb.eng/cad/cheetah-cad/public/dev_env/tre_design_spec.pdf | |
379 | .Ve | |
380 | .SH "AUTHOR" | |
381 | .IX Header "AUTHOR" | |
382 | Jeff Gibson, <jeff.gibson@sun.com> |