File: | /usr/local/share/automake-1.11/Automake/VarDef.pm |
Coverage: | 42.9% |
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1 | # Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc. | ||||||
2 | |||||||
3 | # This program is free software; you can redistribute it and/or modify | ||||||
4 | # it under the terms of the GNU General Public License as published by | ||||||
5 | # the Free Software Foundation; either version 2, or (at your option) | ||||||
6 | # any later version. | ||||||
7 | |||||||
8 | # This program is distributed in the hope that it will be useful, | ||||||
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||||||
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||||||
11 | # GNU General Public License for more details. | ||||||
12 | |||||||
13 | # You should have received a copy of the GNU General Public License | ||||||
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||||||
15 | |||||||
16 | package Automake::VarDef; | ||||||
17 | 1 1 1 | 8 1 4 | use strict; | ||||
18 | 1 1 1 | 5 7 2 | use Carp; | ||||
19 | 1 1 1 | 4 1 2 | use Automake::ChannelDefs; | ||||
20 | 1 1 1 | 11 1 8 | use Automake::ItemDef; | ||||
21 | |||||||
22 | require Exporter; | ||||||
23 | 1 1 1 | 4 1 3 | use vars '@ISA', '@EXPORT'; | ||||
24 | @ISA = qw/Automake::ItemDef Exporter/; | ||||||
25 | @EXPORT = qw (&VAR_AUTOMAKE &VAR_CONFIGURE &VAR_MAKEFILE | ||||||
26 | &VAR_ASIS &VAR_PRETTY &VAR_SILENT &VAR_SORTED); | ||||||
27 | |||||||
28 - 84 | =head1 NAME Automake::VarDef - a class for variable definitions =head1 SYNOPSIS use Automake::VarDef; use Automake::Location; # Create a VarDef for a definition such as # | # any comment # | foo = bar # more comment # in Makefile.am my $loc = new Automake::Location 'Makefile.am:2'; my $def = new Automake::VarDef ('foo', 'bar # more comment', '# any comment', $loc, '', VAR_MAKEFILE, VAR_ASIS); # Appending to a definition. $def->append ('value to append', 'comment to append'); # Accessors. my $value = $def->value; # with trailing `#' comments and # continuation ("\\\n") omitted. my $value = $def->raw_value; # the real value, as passed to new(). my $comment = $def->comment; my $location = $def->location; my $type = $def->type; my $owner = $def->owner; my $pretty = $def->pretty; # Changing owner. $def->set_owner (VAR_CONFIGURE, new Automake::Location 'configure.ac:15'); # Marking examined definitions. $def->set_seen; my $seen_p = $def->seen; # Printing a variable for debugging. print STDERR $def->dump; =head1 DESCRIPTION This class gathers data related to one Makefile-variable definition. =head2 Constants =over 4 =item C<VAR_AUTOMAKE>, C<VAR_CONFIGURE>, C<VAR_MAKEFILE> Possible owners for variables. A variable can be defined by Automake, in F<configure.ac> (using C<AC_SUBST>), or in the user's F<Makefile.am>. =cut | ||||||
85 | |||||||
86 | # Defined so that the owner of a variable can only be increased (e.g | ||||||
87 | # Automake should not override a configure or Makefile variable). | ||||||
88 | 1 1 1 | 4 1 3 | use constant VAR_AUTOMAKE => 0; # Variable defined by Automake. | ||||
89 | 1 1 1 | 3 1 3 | use constant VAR_CONFIGURE => 1;# Variable defined in configure.ac. | ||||
90 | 1 1 1 | 4 1 2 | use constant VAR_MAKEFILE => 2; # Variable defined in Makefile.am. | ||||
91 | |||||||
92 - 104 | =item C<VAR_ASIS>, C<VAR_PRETTY>, C<VAR_SILENT>, C<VAR_SORTED> Possible print styles. C<VAR_ASIS> variables should be output as-is. C<VAR_PRETTY> variables are wrapped on multiple lines if they cannot fit on one. C<VAR_SILENT> variables are not output at all. Finally, C<VAR_SORTED> variables should be sorted and then handled as C<VAR_PRETTY> variables. C<VAR_SILENT> variables can also be overridden silently (unlike the other kinds of variables whose overriding may sometimes produce warnings). =cut | ||||||
105 | |||||||
106 | # Possible values for pretty. | ||||||
107 | 1 1 1 | 3 1 7 | use constant VAR_ASIS => 0; # Output as-is. | ||||
108 | 1 1 1 | 4 1 2 | use constant VAR_PRETTY => 1; # Pretty printed on output. | ||||
109 | 1 1 1 | 3 1 2 | use constant VAR_SILENT => 2; # Not output. (Can also be | ||||
110 | # overridden silently.) | ||||||
111 | 1 1 1 | 4 1 3 | use constant VAR_SORTED => 3; # Sorted and pretty-printed. | ||||
112 | |||||||
113 | =back | ||||||
114 | |||||||
115 - 145 | =head2 Methods C<VarDef> defines the following methods in addition to those inherited from L<Automake::ItemDef>. =over 4 =item C<my $def = new Automake::VarDef ($varname, $value, $comment, $location, $type, $owner, $pretty)> Create a new Makefile-variable definition. C<$varname> is the name of the variable being defined and C<$value> its value. C<$comment> is any comment preceding the definition. (Because Automake reorders variable definitions in the output, it also tries to carry comments around.) C<$location> is the place where the definition occurred, it should be an instance of L<Automake::Location>. C<$type> should be C<''> for definitions made with C<=>, and C<':'> for those made with C<:=>. C<$owner> specifies who owns the variables, it can be one of C<VAR_AUTOMAKE>, C<VAR_CONFIGURE>, or C<VAR_MAKEFILE> (see these definitions). Finally, C<$pretty> tells how the variable should be output, and can be one of C<VAR_ASIS>, C<VAR_PRETTY>, or C<VAR_SILENT>, or C<VAR_SORTED> (see these definitions). =cut | ||||||
146 | |||||||
147 | sub new ($$$$$$$$) | ||||||
148 | { | ||||||
149 | 0 | 1 | my ($class, $var, $value, $comment, $location, $type, $owner, $pretty) = @_; | ||||
150 | |||||||
151 | # A user variable must be set by either `=' or `:=', and later | ||||||
152 | # promoted to `+='. | ||||||
153 | 0 | if ($owner != VAR_AUTOMAKE && $type eq '+') | |||||
154 | { | ||||||
155 | 0 | error $location, "$var must be set with `=' before using `+='"; | |||||
156 | } | ||||||
157 | |||||||
158 | 0 | my $self = Automake::ItemDef::new ($class, $comment, $location, $owner); | |||||
159 | 0 | $self->{'value'} = $value; | |||||
160 | 0 | $self->{'type'} = $type; | |||||
161 | 0 | $self->{'pretty'} = $pretty; | |||||
162 | 0 | $self->{'seen'} = 0; | |||||
163 | 0 | return $self; | |||||
164 | } | ||||||
165 | |||||||
166 - 171 | =item C<$def-E<gt>append ($value, $comment)> Append C<$value> and <$comment> to the existing value and comment of C<$def>. This is normally called on C<+=> definitions. =cut | ||||||
172 | |||||||
173 | sub append ($$$) | ||||||
174 | { | ||||||
175 | 0 | 1 | my ($self, $value, $comment) = @_; | ||||
176 | 0 | $self->{'comment'} .= $comment; | |||||
177 | |||||||
178 | 0 | my $val = $self->{'value'}; | |||||
179 | |||||||
180 | # Strip comments from augmented variables. This is so that | ||||||
181 | # VAR = foo # com | ||||||
182 | # VAR += bar | ||||||
183 | # does not become | ||||||
184 | # VAR = foo # com bar | ||||||
185 | # Furthermore keeping `#' would not be portable if the variable is | ||||||
186 | # output on multiple lines. | ||||||
187 | 0 | $val =~ s/ ?#.*//; | |||||
188 | |||||||
189 | 0 | if (chomp $val) | |||||
190 | { | ||||||
191 | # Insert a backslash before a trailing newline. | ||||||
192 | 0 | $val .= "\\\n"; | |||||
193 | } | ||||||
194 | elsif ($val) | ||||||
195 | { | ||||||
196 | # Insert a separator. | ||||||
197 | 0 | $val .= ' '; | |||||
198 | } | ||||||
199 | 0 | $self->{'value'} = $val . $value; | |||||
200 | # Turn ASIS appended variables into PRETTY variables. This is to | ||||||
201 | # cope with `make' implementation that cannot read very long lines. | ||||||
202 | 0 | $self->{'pretty'} = VAR_PRETTY if $self->{'pretty'} == VAR_ASIS; | |||||
203 | } | ||||||
204 | |||||||
205 - 214 | =item C<$def-E<gt>value> =item C<$def-E<gt>type> =item C<$def-E<gt>pretty> Accessors to the various constituents of a C<VarDef>. See the documentation of C<new>'s arguments for a description of these. =cut | ||||||
215 | |||||||
216 | sub value ($) | ||||||
217 | { | ||||||
218 | 0 | 1 | my ($self) = @_; | ||||
219 | 0 | my $val = $self->raw_value; | |||||
220 | # Strip anything past `#'. `#' characters cannot be escaped | ||||||
221 | # in Makefiles, so we don't have to be smart. | ||||||
222 | 0 | $val =~ s/#.*$//s; | |||||
223 | # Strip backslashes. | ||||||
224 | 0 | $val =~ s/\\$/ /mg; | |||||
225 | 0 | return $val; | |||||
226 | } | ||||||
227 | |||||||
228 | sub raw_value ($) | ||||||
229 | { | ||||||
230 | 0 | 0 | my ($self) = @_; | ||||
231 | 0 | return $self->{'value'}; | |||||
232 | } | ||||||
233 | |||||||
234 | sub type ($) | ||||||
235 | { | ||||||
236 | 0 | 1 | my ($self) = @_; | ||||
237 | 0 | return $self->{'type'}; | |||||
238 | } | ||||||
239 | |||||||
240 | sub pretty ($) | ||||||
241 | { | ||||||
242 | 0 | 1 | my ($self) = @_; | ||||
243 | 0 | return $self->{'pretty'}; | |||||
244 | } | ||||||
245 | |||||||
246 - 253 | =item C<$def-E<gt>set_owner ($owner, $location)> Change the owner of a definition. This usually happens because the user used C<+=> on an Automake variable, so (s)he now owns the content. C<$location> should be an instance of L<Automake::Location> indicating where the change took place. =cut | ||||||
254 | |||||||
255 | sub set_owner ($$$) | ||||||
256 | { | ||||||
257 | 0 | 1 | my ($self, $owner, $location) = @_; | ||||
258 | # We always adjust the location when the owner changes (even for | ||||||
259 | # `+=' statements). The risk otherwise is to warn about | ||||||
260 | # a VAR_MAKEFILE variable and locate it in configure.ac... | ||||||
261 | 0 | $self->{'owner'} = $owner; | |||||
262 | 0 | $self->{'location'} = $location; | |||||
263 | } | ||||||
264 | |||||||
265 - 273 | =item C<$def-E<gt>set_seen> =item C<$bool = $def-E<gt>seen> These function allows Automake to mark (C<set_seen>) variable that it has examined in some way, and latter check (using C<seen>) for unused variables. Unused variables usually indicate typos. =cut | ||||||
274 | |||||||
275 | sub set_seen ($) | ||||||
276 | { | ||||||
277 | 0 | 1 | my ($self) = @_; | ||||
278 | 0 | $self->{'seen'} = 1; | |||||
279 | } | ||||||
280 | |||||||
281 | sub seen ($) | ||||||
282 | { | ||||||
283 | 0 | 1 | my ($self) = @_; | ||||
284 | 0 | return $self->{'seen'}; | |||||
285 | } | ||||||
286 | |||||||
287 - 292 | =item C<$str = $def-E<gt>dump> Format the contents of C<$def> as a human-readable string, for debugging. =cut | ||||||
293 | |||||||
294 | sub dump ($) | ||||||
295 | { | ||||||
296 | 0 | 1 | my ($self) = @_; | ||||
297 | 0 | my $owner = $self->owner; | |||||
298 | |||||||
299 | 0 | if ($owner == VAR_AUTOMAKE) | |||||
300 | { | ||||||
301 | 0 | $owner = 'Automake'; | |||||
302 | } | ||||||
303 | elsif ($owner == VAR_CONFIGURE) | ||||||
304 | { | ||||||
305 | 0 | $owner = 'Configure'; | |||||
306 | } | ||||||
307 | elsif ($owner == VAR_MAKEFILE) | ||||||
308 | { | ||||||
309 | 0 | $owner = 'Makefile'; | |||||
310 | } | ||||||
311 | else | ||||||
312 | { | ||||||
313 | 0 | prog_error ("unexpected owner"); | |||||
314 | } | ||||||
315 | |||||||
316 | 0 | my $where = $self->location->dump; | |||||
317 | 0 | my $comment = $self->comment; | |||||
318 | 0 | my $value = $self->raw_value; | |||||
319 | 0 | my $type = $self->type; | |||||
320 | |||||||
321 | 0 | return "{ | |||||
322 | type: $type= | ||||||
323 | where: $where comment: $comment | ||||||
324 | value: $value | ||||||
325 | owner: $owner | ||||||
326 | }\n"; | ||||||
327 | } | ||||||
328 | |||||||
329 | =back | ||||||
330 | |||||||
331 - 335 | =head1 SEE ALSO L<Automake::Variable>, L<Automake::ItemDef>. =cut | ||||||
336 | |||||||
337 | 1; | ||||||
338 | |||||||
339 | ### Setup "GNU" style for perl-mode and cperl-mode. | ||||||
340 | ## Local Variables: | ||||||
341 | ## perl-indent-level: 2 | ||||||
342 | ## perl-continued-statement-offset: 2 | ||||||
343 | ## perl-continued-brace-offset: 0 | ||||||
344 | ## perl-brace-offset: 0 | ||||||
345 | ## perl-brace-imaginary-offset: 0 | ||||||
346 | ## perl-label-offset: -2 | ||||||
347 | ## cperl-indent-level: 2 | ||||||
348 | ## cperl-brace-offset: 0 | ||||||
349 | ## cperl-continued-brace-offset: 0 | ||||||
350 | ## cperl-label-offset: -2 | ||||||
351 | ## cperl-extra-newline-before-brace: t | ||||||
352 | ## cperl-merge-trailing-else: nil | ||||||
353 | ## cperl-continued-statement-offset: 2 | ||||||
354 | ## End: |