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3ef515df | 1 | #!./perl |
67d7b5ef | 2 | BEGIN { |
a999c27c JH |
3 | # @INC poking no longer needed w/ new MakeMaker and Makefile.PL's |
4 | # with $ENV{PERL_CORE} set | |
5 | # In case we need it in future... | |
6 | require Config; import Config; | |
67d7b5ef JH |
7 | } |
8 | use strict; | |
9 | use Getopt::Std; | |
10 | my @orig_ARGV = @ARGV; | |
aae85ceb | 11 | our $VERSION = do { my @r = (q$Revision: 1.21 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; |
67d7b5ef JH |
12 | |
13 | # These may get re-ordered. | |
14 | # RAW is a do_now as inserted by &enter | |
15 | # AGG is an aggreagated do_now, as built up by &process | |
a999c27c | 16 | |
67d7b5ef JH |
17 | use constant { |
18 | RAW_NEXT => 0, | |
19 | RAW_IN_LEN => 1, | |
20 | RAW_OUT_BYTES => 2, | |
21 | RAW_FALLBACK => 3, | |
22 | ||
23 | AGG_MIN_IN => 0, | |
24 | AGG_MAX_IN => 1, | |
25 | AGG_OUT_BYTES => 2, | |
26 | AGG_NEXT => 3, | |
27 | AGG_IN_LEN => 4, | |
28 | AGG_OUT_LEN => 5, | |
29 | AGG_FALLBACK => 6, | |
30 | }; | |
a999c27c | 31 | |
67d7b5ef JH |
32 | # (See the algorithm in encengine.c - we're building structures for it) |
33 | ||
34 | # There are two sorts of structures. | |
35 | # "do_now" (an array, two variants of what needs storing) is whatever we need | |
36 | # to do now we've read an input byte. | |
37 | # It's housed in a "do_next" (which is how we got to it), and in turn points | |
38 | # to a "do_next" which contains all the "do_now"s for the next input byte. | |
39 | ||
40 | # There will be a "do_next" which is the start state. | |
41 | # For a single byte encoding it's the only "do_next" - each "do_now" points | |
42 | # back to it, and each "do_now" will cause bytes. There is no state. | |
43 | ||
44 | # For a multi-byte encoding where all characters in the input are the same | |
45 | # length, then there will be a tree of "do_now"->"do_next"->"do_now" | |
46 | # branching out from the start state, one step for each input byte. | |
47 | # The leaf "do_now"s will all be at the same distance from the start state, | |
48 | # only the leaf "do_now"s cause output bytes, and they in turn point back to | |
49 | # the start state. | |
50 | ||
51 | # For an encoding where there are varaible length input byte sequences, you | |
52 | # will encounter a leaf "do_now" sooner for the shorter input sequences, but | |
53 | # as before the leaves will point back to the start state. | |
54 | ||
55 | # The system will cope with escape encodings (imagine them as a mostly | |
56 | # self-contained tree for each escape state, and cross links between trees | |
57 | # at the state-switching characters) but so far no input format defines these. | |
58 | ||
59 | # The system will also cope with having output "leaves" in the middle of | |
60 | # the bifurcating branches, not just at the extremities, but again no | |
61 | # input format does this yet. | |
62 | ||
63 | # There are two variants of the "do_now" structure. The first, smaller variant | |
64 | # is generated by &enter as the input file is read. There is one structure | |
65 | # for each input byte. Say we are mapping a single byte encoding to a | |
66 | # single byte encoding, with "ABCD" going "abcd". There will be | |
67 | # 4 "do_now"s, {"A" => [...,"a",...], "B" => [...,"b",...], "C"=>..., "D"=>...} | |
68 | ||
69 | # &process then walks the tree, building aggregate "do_now" structres for | |
70 | # adjacent bytes where possible. The aggregate is for a contiguous range of | |
71 | # bytes which each produce the same length of output, each move to the | |
72 | # same next state, and each have the same fallback flag. | |
73 | # So our 4 RAW "do_now"s above become replaced by a single structure | |
74 | # containing: | |
75 | # ["A", "D", "abcd", 1, ...] | |
76 | # ie, for an input byte $_ in "A".."D", output 1 byte, found as | |
77 | # substr ("abcd", (ord $_ - ord "A") * 1, 1) | |
78 | # which maps very nicely into pointer arithmetic in C for encengine.c | |
79 | ||
80 | sub encode_U | |
81 | { | |
82 | # UTF-8 encode long hand - only covers part of perl's range | |
83 | ## my $uv = shift; | |
84 | # chr() works in native space so convert value from table | |
85 | # into that space before using chr(). | |
86 | my $ch = chr(utf8::unicode_to_native($_[0])); | |
87 | # Now get core perl to encode that the way it likes. | |
88 | utf8::encode($ch); | |
89 | return $ch; | |
90 | } | |
91 | ||
92 | sub encode_S | |
93 | { | |
94 | # encode single byte | |
95 | ## my ($ch,$page) = @_; return chr($ch); | |
96 | return chr $_[0]; | |
97 | } | |
98 | ||
99 | sub encode_D | |
100 | { | |
101 | # encode double byte MS byte first | |
102 | ## my ($ch,$page) = @_; return chr($page).chr($ch); | |
103 | return chr ($_[1]) . chr $_[0]; | |
104 | } | |
105 | ||
106 | sub encode_M | |
107 | { | |
108 | # encode Multi-byte - single for 0..255 otherwise double | |
109 | ## my ($ch,$page) = @_; | |
110 | ## return &encode_D if $page; | |
111 | ## return &encode_S; | |
112 | return chr ($_[1]) . chr $_[0] if $_[1]; | |
113 | return chr $_[0]; | |
114 | } | |
115 | ||
116 | my %encode_types = (U => \&encode_U, | |
117 | S => \&encode_S, | |
118 | D => \&encode_D, | |
119 | M => \&encode_M, | |
120 | ); | |
121 | ||
122 | # Win32 does not expand globs on command line | |
123 | eval "\@ARGV = map(glob(\$_),\@ARGV)" if ($^O eq 'MSWin32'); | |
124 | ||
125 | my %opt; | |
126 | # I think these are: | |
127 | # -Q to disable the duplicate codepoint test | |
128 | # -S make mapping errors fatal | |
129 | # -q to remove comments written to output files | |
130 | # -O to enable the (brute force) substring optimiser | |
131 | # -o <output> to specify the output file name (else it's the first arg) | |
132 | # -f <inlist> to give a file with a list of input files (else use the args) | |
133 | # -n <name> to name the encoding (else use the basename of the input file. | |
aae85ceb | 134 | getopts('CM:SQqOo:f:n:',\%opt); |
67d7b5ef JH |
135 | |
136 | $opt{M} and make_makefile_pl($opt{M}, @ARGV); | |
aae85ceb | 137 | $opt{C} and make_configlocal_pm($opt{C}, @ARGV); |
67d7b5ef JH |
138 | |
139 | # This really should go first, else the die here causes empty (non-erroneous) | |
140 | # output files to be written. | |
141 | my @encfiles; | |
142 | if (exists $opt{'f'}) { | |
143 | # -F is followed by name of file containing list of filenames | |
144 | my $flist = $opt{'f'}; | |
145 | open(FLIST,$flist) || die "Cannot open $flist:$!"; | |
146 | chomp(@encfiles = <FLIST>); | |
147 | close(FLIST); | |
148 | } else { | |
149 | @encfiles = @ARGV; | |
150 | } | |
151 | ||
152 | my $cname = (exists $opt{'o'}) ? $opt{'o'} : shift(@ARGV); | |
153 | chmod(0666,$cname) if -f $cname && !-w $cname; | |
154 | open(C,">$cname") || die "Cannot open $cname:$!"; | |
155 | ||
156 | my $dname = $cname; | |
157 | my $hname = $cname; | |
158 | ||
159 | my ($doC,$doEnc,$doUcm,$doPet); | |
160 | ||
161 | if ($cname =~ /\.(c|xs)$/) | |
162 | { | |
163 | $doC = 1; | |
e7cbefb8 | 164 | $dname =~ s/(\.[^\.]*)?$/.exh/; |
67d7b5ef JH |
165 | chmod(0666,$dname) if -f $cname && !-w $dname; |
166 | open(D,">$dname") || die "Cannot open $dname:$!"; | |
167 | $hname =~ s/(\.[^\.]*)?$/.h/; | |
168 | chmod(0666,$hname) if -f $cname && !-w $hname; | |
169 | open(H,">$hname") || die "Cannot open $hname:$!"; | |
170 | ||
171 | foreach my $fh (\*C,\*D,\*H) | |
172 | { | |
173 | print $fh <<"END" unless $opt{'q'}; | |
174 | /* | |
175 | !!!!!!! DO NOT EDIT THIS FILE !!!!!!! | |
176 | This file was autogenerated by: | |
177 | $^X $0 @orig_ARGV | |
178 | */ | |
179 | END | |
180 | } | |
181 | ||
182 | if ($cname =~ /(\w+)\.xs$/) | |
183 | { | |
184 | print C "#include <EXTERN.h>\n"; | |
185 | print C "#include <perl.h>\n"; | |
186 | print C "#include <XSUB.h>\n"; | |
187 | print C "#define U8 U8\n"; | |
188 | } | |
189 | print C "#include \"encode.h\"\n"; | |
190 | ||
191 | } | |
192 | elsif ($cname =~ /\.enc$/) | |
193 | { | |
194 | $doEnc = 1; | |
195 | } | |
196 | elsif ($cname =~ /\.ucm$/) | |
197 | { | |
198 | $doUcm = 1; | |
199 | } | |
200 | elsif ($cname =~ /\.pet$/) | |
201 | { | |
202 | $doPet = 1; | |
203 | } | |
204 | ||
205 | my %encoding; | |
206 | my %strings; | |
207 | my $saved = 0; | |
208 | my $subsave = 0; | |
209 | my $strings = 0; | |
210 | ||
211 | sub cmp_name | |
212 | { | |
213 | if ($a =~ /^.*-(\d+)/) | |
214 | { | |
215 | my $an = $1; | |
216 | if ($b =~ /^.*-(\d+)/) | |
217 | { | |
218 | my $r = $an <=> $1; | |
219 | return $r if $r; | |
220 | } | |
221 | } | |
222 | return $a cmp $b; | |
223 | } | |
224 | ||
225 | ||
226 | foreach my $enc (sort cmp_name @encfiles) | |
227 | { | |
228 | my ($name,$sfx) = $enc =~ /^.*?([\w-]+)\.(enc|ucm)$/; | |
229 | $name = $opt{'n'} if exists $opt{'n'}; | |
230 | if (open(E,$enc)) | |
231 | { | |
232 | if ($sfx eq 'enc') | |
233 | { | |
234 | compile_enc(\*E,lc($name)); | |
235 | } | |
236 | else | |
237 | { | |
238 | compile_ucm(\*E,lc($name)); | |
239 | } | |
240 | } | |
241 | else | |
242 | { | |
243 | warn "Cannot open $enc for $name:$!"; | |
244 | } | |
245 | } | |
246 | ||
247 | if ($doC) | |
248 | { | |
249 | print STDERR "Writing compiled form\n"; | |
250 | foreach my $name (sort cmp_name keys %encoding) | |
251 | { | |
252 | my ($e2u,$u2e,$erep,$min_el,$max_el) = @{$encoding{$name}}; | |
253 | output(\*C,$name.'_utf8',$e2u); | |
254 | output(\*C,'utf8_'.$name,$u2e); | |
255 | push(@{$encoding{$name}},outstring(\*C,$e2u->{Cname}.'_def',$erep)); | |
256 | } | |
257 | foreach my $enc (sort cmp_name keys %encoding) | |
258 | { | |
259 | my ($e2u,$u2e,$rep,$min_el,$max_el,$rsym) = @{$encoding{$enc}}; | |
260 | my @info = ($e2u->{Cname},$u2e->{Cname},$rsym,length($rep),$min_el,$max_el); | |
261 | my $sym = "${enc}_encoding"; | |
262 | $sym =~ s/\W+/_/g; | |
263 | print C "encode_t $sym = \n"; | |
264 | print C " {",join(',',@info,"{\"$enc\",(const char *)0}"),"};\n\n"; | |
265 | } | |
266 | ||
267 | foreach my $enc (sort cmp_name keys %encoding) | |
268 | { | |
269 | my $sym = "${enc}_encoding"; | |
270 | $sym =~ s/\W+/_/g; | |
271 | print H "extern encode_t $sym;\n"; | |
272 | print D " Encode_XSEncoding(aTHX_ &$sym);\n"; | |
273 | } | |
274 | ||
275 | if ($cname =~ /(\w+)\.xs$/) | |
276 | { | |
277 | my $mod = $1; | |
278 | print C <<'END'; | |
279 | ||
280 | static void | |
281 | Encode_XSEncoding(pTHX_ encode_t *enc) | |
282 | { | |
283 | dSP; | |
284 | HV *stash = gv_stashpv("Encode::XS", TRUE); | |
285 | SV *sv = sv_bless(newRV_noinc(newSViv(PTR2IV(enc))),stash); | |
286 | int i = 0; | |
287 | PUSHMARK(sp); | |
288 | XPUSHs(sv); | |
289 | while (enc->name[i]) | |
290 | { | |
291 | const char *name = enc->name[i++]; | |
292 | XPUSHs(sv_2mortal(newSVpvn(name,strlen(name)))); | |
293 | } | |
294 | PUTBACK; | |
295 | call_pv("Encode::define_encoding",G_DISCARD); | |
296 | SvREFCNT_dec(sv); | |
297 | } | |
298 | ||
299 | END | |
300 | ||
301 | print C "\nMODULE = Encode::$mod\tPACKAGE = Encode::$mod\n\n"; | |
302 | print C "BOOT:\n{\n"; | |
303 | print C "#include \"$dname\"\n"; | |
304 | print C "}\n"; | |
305 | } | |
306 | # Close in void context is bad, m'kay | |
307 | close(D) or warn "Error closing '$dname': $!"; | |
308 | close(H) or warn "Error closing '$hname': $!"; | |
309 | ||
310 | my $perc_saved = $strings/($strings + $saved) * 100; | |
311 | my $perc_subsaved = $strings/($strings + $subsave) * 100; | |
312 | printf STDERR "%d bytes in string tables\n",$strings; | |
313 | printf STDERR "%d bytes (%.3g%%) saved spotting duplicates\n", | |
314 | $saved, $perc_saved if $saved; | |
315 | printf STDERR "%d bytes (%.3g%%) saved using substrings\n", | |
316 | $subsave, $perc_subsaved if $subsave; | |
317 | } | |
318 | elsif ($doEnc) | |
319 | { | |
320 | foreach my $name (sort cmp_name keys %encoding) | |
321 | { | |
322 | my ($e2u,$u2e,$erep,$min_el,$max_el) = @{$encoding{$name}}; | |
323 | output_enc(\*C,$name,$e2u); | |
324 | } | |
325 | } | |
326 | elsif ($doUcm) | |
327 | { | |
328 | foreach my $name (sort cmp_name keys %encoding) | |
329 | { | |
330 | my ($e2u,$u2e,$erep,$min_el,$max_el) = @{$encoding{$name}}; | |
331 | output_ucm(\*C,$name,$u2e,$erep,$min_el,$max_el); | |
332 | } | |
333 | } | |
334 | ||
335 | # writing half meg files and then not checking to see if you just filled the | |
336 | # disk is bad, m'kay | |
337 | close(C) or die "Error closing '$cname': $!"; | |
338 | ||
339 | # End of the main program. | |
340 | ||
341 | sub compile_ucm | |
342 | { | |
343 | my ($fh,$name) = @_; | |
344 | my $e2u = {}; | |
345 | my $u2e = {}; | |
346 | my $cs; | |
347 | my %attr; | |
348 | while (<$fh>) | |
349 | { | |
350 | s/#.*$//; | |
351 | last if /^\s*CHARMAP\s*$/i; | |
352 | if (/^\s*<(\w+)>\s+"?([^"]*)"?\s*$/i) # " # Grrr | |
353 | { | |
354 | $attr{$1} = $2; | |
355 | } | |
356 | } | |
357 | if (!defined($cs = $attr{'code_set_name'})) | |
358 | { | |
359 | warn "No <code_set_name> in $name\n"; | |
360 | } | |
361 | else | |
362 | { | |
363 | $name = $cs unless exists $opt{'n'}; | |
364 | } | |
365 | my $erep; | |
366 | my $urep; | |
367 | my $max_el; | |
368 | my $min_el; | |
369 | if (exists $attr{'subchar'}) | |
370 | { | |
371 | my @byte; | |
372 | $attr{'subchar'} =~ /^\s*/cg; | |
373 | push(@byte,$1) while $attr{'subchar'} =~ /\G\\x([0-9a-f]+)/icg; | |
374 | $erep = join('',map(chr(hex($_)),@byte)); | |
375 | } | |
376 | print "Reading $name ($cs)\n"; | |
377 | my $nfb = 0; | |
378 | my $hfb = 0; | |
379 | while (<$fh>) | |
380 | { | |
381 | s/#.*$//; | |
382 | last if /^\s*END\s+CHARMAP\s*$/i; | |
383 | next if /^\s*$/; | |
a999c27c JH |
384 | my (@uni, @byte) = (); |
385 | my ($uni, $byte, $fb) = m/^(\S+)\s+(\S+)\s+(\S+)\s+/o | |
386 | or die "Bad line: $_"; | |
387 | while ($uni =~ m/\G<([U0-9a-fA-F\+]+)>/g){ | |
388 | push @uni, map { substr($_, 1) } split(/\+/, $1); | |
389 | } | |
390 | while ($byte =~ m/\G\\x([0-9a-fA-F]+)/g){ | |
391 | push @byte, $1; | |
392 | } | |
393 | if (@uni) | |
67d7b5ef | 394 | { |
a999c27c | 395 | my $uch = join('', map { encode_U(hex($_)) } @uni ); |
67d7b5ef JH |
396 | my $ech = join('',map(chr(hex($_)),@byte)); |
397 | my $el = length($ech); | |
398 | $max_el = $el if (!defined($max_el) || $el > $max_el); | |
399 | $min_el = $el if (!defined($min_el) || $el < $min_el); | |
400 | if (length($fb)) | |
401 | { | |
402 | $fb = substr($fb,1); | |
403 | $hfb++; | |
404 | } | |
405 | else | |
406 | { | |
407 | $nfb++; | |
408 | $fb = '0'; | |
409 | } | |
410 | # $fb is fallback flag | |
411 | # 0 - round trip safe | |
412 | # 1 - fallback for unicode -> enc | |
413 | # 2 - skip sub-char mapping | |
414 | # 3 - fallback enc -> unicode | |
415 | enter($u2e,$uch,$ech,$u2e,$fb+0) if ($fb =~ /[01]/); | |
416 | enter($e2u,$ech,$uch,$e2u,$fb+0) if ($fb =~ /[03]/); | |
417 | } | |
418 | else | |
419 | { | |
420 | warn $_; | |
421 | } | |
422 | } | |
423 | if ($nfb && $hfb) | |
424 | { | |
425 | die "$nfb entries without fallback, $hfb entries with\n"; | |
426 | } | |
427 | $encoding{$name} = [$e2u,$u2e,$erep,$min_el,$max_el]; | |
428 | } | |
429 | ||
430 | ||
431 | ||
432 | sub compile_enc | |
433 | { | |
434 | my ($fh,$name) = @_; | |
435 | my $e2u = {}; | |
436 | my $u2e = {}; | |
437 | ||
438 | my $type; | |
439 | while ($type = <$fh>) | |
440 | { | |
441 | last if $type !~ /^\s*#/; | |
442 | } | |
443 | chomp($type); | |
444 | return if $type eq 'E'; | |
445 | # Do the hash lookup once, rather than once per function call. 4% speedup. | |
446 | my $type_func = $encode_types{$type}; | |
447 | my ($def,$sym,$pages) = split(/\s+/,scalar(<$fh>)); | |
448 | warn "$type encoded $name\n"; | |
449 | my $rep = ''; | |
450 | # Save a defined test by setting these to defined values. | |
451 | my $min_el = ~0; # A very big integer | |
452 | my $max_el = 0; # Anything must be longer than 0 | |
453 | { | |
454 | my $v = hex($def); | |
455 | $rep = &$type_func($v & 0xFF, ($v >> 8) & 0xffe); | |
456 | } | |
457 | my $errors; | |
458 | my $seen; | |
459 | # use -Q to silence the seen test. Makefile.PL uses this by default. | |
460 | $seen = {} unless $opt{Q}; | |
461 | do | |
462 | { | |
463 | my $line = <$fh>; | |
464 | chomp($line); | |
465 | my $page = hex($line); | |
466 | my $ch = 0; | |
467 | my $i = 16; | |
468 | do | |
469 | { | |
470 | # So why is it 1% faster to leave the my here? | |
471 | my $line = <$fh>; | |
472 | $line =~ s/\r\n$/\n/; | |
473 | die "$.:${line}Line should be exactly 65 characters long including | |
474 | newline (".length($line).")" unless length ($line) == 65; | |
475 | # Split line into groups of 4 hex digits, convert groups to ints | |
476 | # This takes 65.35 | |
477 | # map {hex $_} $line =~ /(....)/g | |
478 | # This takes 63.75 (2.5% less time) | |
479 | # unpack "n*", pack "H*", $line | |
480 | # There's an implicit loop in map. Loops are bad, m'kay. Ops are bad, m'kay | |
481 | # Doing it as while ($line =~ /(....)/g) took 74.63 | |
482 | foreach my $val (unpack "n*", pack "H*", $line) | |
483 | { | |
484 | next if $val == 0xFFFD; | |
485 | my $ech = &$type_func($ch,$page); | |
486 | if ($val || (!$ch && !$page)) | |
487 | { | |
488 | my $el = length($ech); | |
489 | $max_el = $el if $el > $max_el; | |
490 | $min_el = $el if $el < $min_el; | |
491 | my $uch = encode_U($val); | |
492 | if ($seen) { | |
493 | # We're doing the test. | |
494 | # We don't need to read this quickly, so storing it as a scalar, | |
495 | # rather than 3 (anon array, plus the 2 scalars it holds) saves | |
496 | # RAM and may make us faster on low RAM systems. [see __END__] | |
497 | if (exists $seen->{$uch}) | |
498 | { | |
499 | warn sprintf("U%04X is %02X%02X and %04X\n", | |
500 | $val,$page,$ch,$seen->{$uch}); | |
501 | $errors++; | |
502 | } | |
503 | else | |
504 | { | |
505 | $seen->{$uch} = $page << 8 | $ch; | |
506 | } | |
507 | } | |
508 | # Passing 2 extra args each time is 3.6% slower! | |
509 | # Even with having to add $fallback ||= 0 later | |
510 | enter_fb0($e2u,$ech,$uch); | |
511 | enter_fb0($u2e,$uch,$ech); | |
512 | } | |
513 | else | |
514 | { | |
515 | # No character at this position | |
516 | # enter($e2u,$ech,undef,$e2u); | |
517 | } | |
518 | $ch++; | |
519 | } | |
520 | } while --$i; | |
521 | } while --$pages; | |
522 | die "\$min_el=$min_el, \$max_el=$max_el - seems we read no lines" | |
523 | if $min_el > $max_el; | |
524 | die "$errors mapping conflicts\n" if ($errors && $opt{'S'}); | |
525 | $encoding{$name} = [$e2u,$u2e,$rep,$min_el,$max_el]; | |
526 | } | |
527 | ||
528 | # my ($a,$s,$d,$t,$fb) = @_; | |
529 | sub enter { | |
530 | my ($current,$inbytes,$outbytes,$next,$fallback) = @_; | |
531 | # state we shift to after this (multibyte) input character defaults to same | |
532 | # as current state. | |
533 | $next ||= $current; | |
534 | # Making sure it is defined seems to be faster than {no warnings;} in | |
535 | # &process, or passing it in as 0 explicity. | |
536 | # XXX $fallback ||= 0; | |
537 | ||
538 | # Start at the beginning and work forwards through the string to zero. | |
539 | # effectively we are removing 1 character from the front each time | |
540 | # but we don't actually edit the string. [this alone seems to be 14% speedup] | |
541 | # Hence -$pos is the length of the remaining string. | |
542 | my $pos = -length $inbytes; | |
543 | while (1) { | |
544 | my $byte = substr $inbytes, $pos, 1; | |
545 | # RAW_NEXT => 0, | |
546 | # RAW_IN_LEN => 1, | |
547 | # RAW_OUT_BYTES => 2, | |
548 | # RAW_FALLBACK => 3, | |
549 | # to unicode an array would seem to be better, because the pages are dense. | |
550 | # from unicode can be very sparse, favouring a hash. | |
551 | # hash using the bytes (all length 1) as keys rather than ord value, | |
552 | # as it's easier to sort these in &process. | |
553 | ||
554 | # It's faster to always add $fallback even if it's undef, rather than | |
555 | # choosing between 3 and 4 element array. (hence why we set it defined | |
556 | # above) | |
557 | my $do_now = $current->{Raw}{$byte} ||= [{},-$pos,'',$fallback]; | |
558 | # When $pos was -1 we were at the last input character. | |
559 | unless (++$pos) { | |
560 | $do_now->[RAW_OUT_BYTES] = $outbytes; | |
561 | $do_now->[RAW_NEXT] = $next; | |
562 | return; | |
563 | } | |
564 | # Tail recursion. The intermdiate state may not have a name yet. | |
565 | $current = $do_now->[RAW_NEXT]; | |
566 | } | |
567 | } | |
568 | ||
569 | # This is purely for optimistation. It's just &enter hard coded for $fallback | |
570 | # of 0, using only a 3 entry array ref to save memory for every entry. | |
571 | sub enter_fb0 { | |
572 | my ($current,$inbytes,$outbytes,$next) = @_; | |
573 | $next ||= $current; | |
574 | ||
575 | my $pos = -length $inbytes; | |
576 | while (1) { | |
577 | my $byte = substr $inbytes, $pos, 1; | |
578 | my $do_now = $current->{Raw}{$byte} ||= [{},-$pos,'']; | |
579 | unless (++$pos) { | |
580 | $do_now->[RAW_OUT_BYTES] = $outbytes; | |
581 | $do_now->[RAW_NEXT] = $next; | |
582 | return; | |
583 | } | |
584 | $current = $do_now->[RAW_NEXT]; | |
585 | } | |
586 | } | |
587 | ||
588 | ||
589 | sub outstring | |
590 | { | |
591 | my ($fh,$name,$s) = @_; | |
592 | my $sym = $strings{$s}; | |
593 | if ($sym) | |
594 | { | |
595 | $saved += length($s); | |
596 | } | |
597 | else | |
598 | { | |
599 | if ($opt{'O'}) { | |
600 | foreach my $o (keys %strings) | |
601 | { | |
602 | next unless (my $i = index($o,$s)) >= 0; | |
603 | $sym = $strings{$o}; | |
604 | # gcc things that 0x0e+0x10 (anything with e+) starts to look like | |
605 | # a hexadecimal floating point constant. Silly gcc. Only p | |
606 | # introduces a floating point constant. Put the space in to stop it | |
607 | # getting confused. | |
608 | $sym .= sprintf(" +0x%02x",$i) if ($i); | |
609 | $subsave += length($s); | |
610 | return $strings{$s} = $sym; | |
611 | } | |
612 | } | |
613 | $strings{$s} = $sym = $name; | |
614 | $strings += length($s); | |
615 | my $definition = sprintf "static const U8 %s[%d] = { ",$name,length($s); | |
616 | # Maybe we should assert that these are all <256. | |
617 | $definition .= join(',',unpack "C*",$s); | |
618 | # We have a single long line. Split it at convenient commas. | |
619 | $definition =~ s/(.{74,77},)/$1\n/g; | |
620 | print $fh "$definition };\n\n"; | |
621 | } | |
622 | return $sym; | |
623 | } | |
624 | ||
625 | sub process | |
626 | { | |
627 | my ($name,$a) = @_; | |
628 | $name =~ s/\W+/_/g; | |
629 | $a->{Cname} = $name; | |
630 | my $raw = $a->{Raw}; | |
631 | my ($l, $agg_max_in, $agg_next, $agg_in_len, $agg_out_len, $agg_fallback); | |
632 | my @ent; | |
633 | $agg_max_in = 0; | |
634 | foreach my $key (sort keys %$raw) { | |
635 | # RAW_NEXT => 0, | |
636 | # RAW_IN_LEN => 1, | |
637 | # RAW_OUT_BYTES => 2, | |
638 | # RAW_FALLBACK => 3, | |
639 | my ($next, $in_len, $out_bytes, $fallback) = @{$raw->{$key}}; | |
640 | # Now we are converting from raw to aggregate, switch from 1 byte strings | |
641 | # to numbers | |
642 | my $b = ord $key; | |
643 | $fallback ||= 0; | |
644 | if ($l && | |
645 | # If this == fails, we're going to reset $agg_max_in below anyway. | |
646 | $b == ++$agg_max_in && | |
647 | # References in numeric context give the pointer as an int. | |
648 | $agg_next == $next && | |
649 | $agg_in_len == $in_len && | |
650 | $agg_out_len == length $out_bytes && | |
651 | $agg_fallback == $fallback | |
652 | # && length($l->[AGG_OUT_BYTES]) < 16 | |
653 | ) { | |
654 | # my $i = ord($b)-ord($l->[AGG_MIN_IN]); | |
655 | # we can aggregate this byte onto the end. | |
656 | $l->[AGG_MAX_IN] = $b; | |
657 | $l->[AGG_OUT_BYTES] .= $out_bytes; | |
658 | } else { | |
659 | # AGG_MIN_IN => 0, | |
660 | # AGG_MAX_IN => 1, | |
661 | # AGG_OUT_BYTES => 2, | |
662 | # AGG_NEXT => 3, | |
663 | # AGG_IN_LEN => 4, | |
664 | # AGG_OUT_LEN => 5, | |
665 | # AGG_FALLBACK => 6, | |
666 | # Reset the last thing we saw, plus set 5 lexicals to save some derefs. | |
667 | # (only gains .6% on euc-jp -- is it worth it?) | |
668 | push @ent, $l = [$b, $agg_max_in = $b, $out_bytes, $agg_next = $next, | |
669 | $agg_in_len = $in_len, $agg_out_len = length $out_bytes, | |
670 | $agg_fallback = $fallback]; | |
671 | } | |
672 | if (exists $next->{Cname}) { | |
673 | $next->{'Forward'} = 1 if $next != $a; | |
674 | } else { | |
675 | process(sprintf("%s_%02x",$name,$b),$next); | |
676 | } | |
677 | } | |
678 | # encengine.c rules say that last entry must be for 255 | |
679 | if ($agg_max_in < 255) { | |
680 | push @ent, [1+$agg_max_in, 255,undef,$a,0,0]; | |
681 | } | |
682 | $a->{'Entries'} = \@ent; | |
683 | } | |
684 | ||
685 | sub outtable | |
686 | { | |
687 | my ($fh,$a) = @_; | |
688 | my $name = $a->{'Cname'}; | |
689 | # String tables | |
690 | foreach my $b (@{$a->{'Entries'}}) | |
691 | { | |
692 | next unless $b->[AGG_OUT_LEN]; | |
693 | my $s = $b->[AGG_MIN_IN]; | |
694 | my $e = $b->[AGG_MAX_IN]; | |
695 | outstring($fh,sprintf("%s__%02x_%02x",$name,$s,$e),$b->[AGG_OUT_BYTES]); | |
696 | } | |
697 | if ($a->{'Forward'}) | |
698 | { | |
699 | print $fh "\nstatic encpage_t $name\[",scalar(@{$a->{'Entries'}}),"];\n"; | |
700 | } | |
701 | $a->{'Done'} = 1; | |
702 | foreach my $b (@{$a->{'Entries'}}) | |
703 | { | |
704 | my ($s,$e,$out,$t,$end,$l) = @$b; | |
705 | outtable($fh,$t) unless $t->{'Done'}; | |
706 | } | |
707 | print $fh "\nstatic encpage_t $name\[",scalar(@{$a->{'Entries'}}),"] = {\n"; | |
708 | foreach my $b (@{$a->{'Entries'}}) | |
709 | { | |
710 | my ($sc,$ec,$out,$t,$end,$l,$fb) = @$b; | |
711 | $end |= 0x80 if $fb; | |
712 | print $fh "{"; | |
713 | if ($l) | |
714 | { | |
715 | printf $fh outstring($fh,'',$out); | |
716 | } | |
717 | else | |
718 | { | |
719 | print $fh "0"; | |
720 | } | |
721 | print $fh ",",$t->{Cname}; | |
722 | printf $fh ",0x%02x,0x%02x,$l,$end},\n",$sc,$ec; | |
723 | } | |
724 | print $fh "};\n"; | |
725 | } | |
726 | ||
727 | sub output | |
728 | { | |
729 | my ($fh,$name,$a) = @_; | |
730 | process($name,$a); | |
731 | # Sub-tables | |
732 | outtable($fh,$a); | |
733 | } | |
734 | ||
735 | sub output_enc | |
736 | { | |
737 | my ($fh,$name,$a) = @_; | |
738 | die "Changed - fix me for new structure"; | |
739 | foreach my $b (sort keys %$a) | |
740 | { | |
741 | my ($s,$e,$out,$t,$end,$l,$fb) = @{$a->{$b}}; | |
742 | } | |
743 | } | |
744 | ||
745 | sub decode_U | |
746 | { | |
747 | my $s = shift; | |
748 | } | |
749 | ||
750 | my @uname; | |
751 | sub char_names | |
752 | { | |
753 | my $s = do "unicore/Name.pl"; | |
754 | die "char_names: unicore/Name.pl: $!\n" unless defined $s; | |
755 | pos($s) = 0; | |
756 | while ($s =~ /\G([0-9a-f]+)\t([0-9a-f]*)\t(.*?)\s*\n/igc) | |
757 | { | |
758 | my $name = $3; | |
759 | my $s = hex($1); | |
760 | last if $s >= 0x10000; | |
761 | my $e = length($2) ? hex($2) : $s; | |
762 | for (my $i = $s; $i <= $e; $i++) | |
763 | { | |
764 | $uname[$i] = $name; | |
765 | # print sprintf("U%04X $name\n",$i); | |
766 | } | |
767 | } | |
768 | } | |
769 | ||
770 | sub output_ucm_page | |
771 | { | |
772 | my ($cmap,$a,$t,$pre) = @_; | |
773 | # warn sprintf("Page %x\n",$pre); | |
774 | my $raw = $t->{Raw}; | |
775 | foreach my $key (sort keys %$raw) { | |
776 | # RAW_NEXT => 0, | |
777 | # RAW_IN_LEN => 1, | |
778 | # RAW_OUT_BYTES => 2, | |
779 | # RAW_FALLBACK => 3, | |
780 | my ($next, $in_len, $out_bytes, $fallback) = @{$raw->{$key}}; | |
781 | my $u = ord $key; | |
782 | $fallback ||= 0; | |
783 | ||
784 | if ($next != $a && $next != $t) { | |
785 | output_ucm_page($cmap,$a,$next,(($pre|($u &0x3F)) << 6)&0xFFFF); | |
786 | } elsif (length $out_bytes) { | |
787 | if ($pre) { | |
788 | $u = $pre|($u &0x3f); | |
789 | } | |
790 | my $s = sprintf "<U%04X> ",$u; | |
791 | #foreach my $c (split(//,$out_bytes)) { | |
792 | # $s .= sprintf "\\x%02X",ord($c); | |
793 | #} | |
794 | # 9.5% faster changing that loop to this: | |
795 | $s .= sprintf +("\\x%02X" x length $out_bytes), unpack "C*", $out_bytes; | |
796 | $s .= sprintf " |%d # %s\n",($fallback ? 1 : 0),$uname[$u]; | |
797 | push(@$cmap,$s); | |
798 | } else { | |
799 | warn join(',',$u, @{$raw->{$key}},$a,$t); | |
800 | } | |
801 | } | |
802 | } | |
803 | ||
804 | sub output_ucm | |
805 | { | |
806 | my ($fh,$name,$h,$rep,$min_el,$max_el) = @_; | |
807 | print $fh "# $0 @orig_ARGV\n" unless $opt{'q'}; | |
808 | print $fh "<code_set_name> \"$name\"\n"; | |
809 | char_names(); | |
810 | if (defined $min_el) | |
811 | { | |
812 | print $fh "<mb_cur_min> $min_el\n"; | |
813 | } | |
814 | if (defined $max_el) | |
815 | { | |
816 | print $fh "<mb_cur_max> $max_el\n"; | |
817 | } | |
818 | if (defined $rep) | |
819 | { | |
820 | print $fh "<subchar> "; | |
821 | foreach my $c (split(//,$rep)) | |
822 | { | |
823 | printf $fh "\\x%02X",ord($c); | |
824 | } | |
825 | print $fh "\n"; | |
826 | } | |
827 | my @cmap; | |
828 | output_ucm_page(\@cmap,$h,$h,0); | |
829 | print $fh "#\nCHARMAP\n"; | |
830 | foreach my $line (sort { substr($a,8) cmp substr($b,8) } @cmap) | |
831 | { | |
832 | print $fh $line; | |
833 | } | |
834 | print $fh "END CHARMAP\n"; | |
835 | } | |
836 | ||
3ef515df JH |
837 | use vars qw( |
838 | $_Enc2xs | |
839 | $_Version | |
840 | $_Inc | |
841 | $_Name | |
842 | $_TableFiles | |
843 | $_Now | |
844 | ); | |
845 | ||
67d7b5ef JH |
846 | sub make_makefile_pl |
847 | { | |
848 | eval { require Encode; }; | |
849 | $@ and die "You need to install Encode to use enc2xs -M\nerror: $@\n"; | |
3ef515df JH |
850 | # our used for variable expanstion |
851 | $_Enc2xs = $0; | |
852 | $_Version = $VERSION; | |
853 | $_Inc = $INC{"Encode.pm"}; $_Inc =~ s/\.pm$//o; | |
854 | $_Name = shift; | |
855 | $_TableFiles = join(",", map {qq('$_')} @_); | |
856 | $_Now = scalar localtime(); | |
aae85ceb | 857 | eval { require File::Spec; }; |
3ef515df | 858 | warn "Generating Makefile.PL\n"; |
aae85ceb | 859 | _print_expand(File::Spec->catfile($_Inc,"Makefile_PL.e2x"),"Makefile.PL"); |
3ef515df | 860 | warn "Generating $_Name.pm\n"; |
aae85ceb | 861 | _print_expand(File::Spec->catfile($_Inc,"_PM.e2x"), "$_Name.pm"); |
3ef515df | 862 | warn "Generating t/$_Name.t\n"; |
aae85ceb | 863 | _print_expand(File::Spec->catfile($_Inc,"_T.e2x"), "t/$_Name.t"); |
3ef515df | 864 | warn "Generating README\n"; |
aae85ceb | 865 | _print_expand(File::Spec->catfile($_Inc,"README.e2x"), "README"); |
3ef515df | 866 | warn "Generating t/$_Name.t\n"; |
aae85ceb | 867 | _print_expand(File::Spec->catfile($_Inc,"Changes.e2x"), "Changes"); |
3ef515df JH |
868 | exit; |
869 | } | |
870 | ||
aae85ceb DK |
871 | use vars qw( |
872 | $_ModLines | |
873 | $_LocalVer | |
874 | ); | |
875 | ||
876 | sub make_configlocal_pm | |
877 | { | |
878 | eval { require Encode; }; | |
879 | $@ and die "Unable to require Encode: $@\n"; | |
880 | eval { require File::Spec; }; | |
881 | # our used for variable expanstion | |
882 | my %in_core = map {$_=>1}('ascii','iso-8859-1','utf8'); | |
883 | my %LocalMod = (); | |
884 | for my $d (@INC){ | |
885 | my $inc = File::Spec->catfile($d, "Encode"); | |
886 | -d $inc or next; | |
887 | opendir my $dh, $inc or die "$inc:$!"; | |
888 | warn "Checking $inc...\n"; | |
889 | for my $f (grep /\.pm$/o, readdir($dh)){ | |
890 | -f File::Spec->catfile($inc, "$f") or next; | |
891 | $INC{"Encode/$f"} and next; | |
892 | warn "require Encode/$f;\n"; | |
893 | eval { require "Encode/$f"; }; | |
894 | $@ and die "Can't require Encode/$f: $@\n"; | |
895 | for my $enc (Encode->encodings()){ | |
896 | $in_core{$enc} and next; | |
897 | $Encode::Config::ExtModule{$enc} and next; | |
898 | my $mod = "Encode/$f"; | |
899 | $mod =~ s/\.pm$//o; $mod =~ s,/,::,og; | |
900 | warn "$enc => $mod\n"; | |
901 | $LocalMod{$enc} = $mod; | |
902 | } | |
903 | } | |
904 | } | |
905 | $_ModLines = ""; | |
906 | for my $enc (sort keys %LocalMod){ | |
907 | $_ModLines .= | |
908 | qq(\$Encode::ExtModule{'$enc'} =\t"$LocalMod{$enc}";\n); | |
909 | } | |
910 | $_LocalVer = _mkversion(); | |
911 | $_Inc = $INC{"Encode.pm"}; $_Inc =~ s/\.pm$//o; | |
912 | warn "Writing Encode::ConfigLocal\n"; | |
913 | _print_expand(File::Spec->catfile($_Inc,"ConfigLocal_PM.e2x"), | |
914 | File::Spec->catfile($_Inc,"ConfigLocal.pm")); | |
915 | exit; | |
916 | } | |
917 | ||
918 | sub _mkversion{ | |
919 | my ($ss,$mm,$hh,$dd,$mo,$yyyy) = localtime(); | |
920 | $yyyy += 1900, $mo +=1; | |
921 | return sprintf("v%04d.%04d.%04d", $yyyy, $mo*100+$dd, $hh*100+$mm); | |
922 | } | |
923 | ||
3ef515df | 924 | sub _print_expand{ |
67d7b5ef JH |
925 | eval { require File::Basename; }; |
926 | $@ and die "File::Basename needed. Are you on miniperl?;\nerror: $@\n"; | |
927 | File::Basename->import(); | |
3ef515df JH |
928 | my ($src, $dst) = @_; |
929 | open my $in, $src or die "$src : $!"; | |
930 | if ((my $d = dirname($dst)) ne '.'){ | |
931 | -d $d or mkdir $d, 0755 or die "mkdir $d : $!"; | |
932 | } | |
933 | open my $out, ">$dst" or die "$!"; | |
934 | my $asis = 0; | |
935 | while (<$in>){ | |
936 | if (/^#### END_OF_HEADER/){ | |
937 | $asis = 1; next; | |
938 | } | |
939 | s/(\$_[A-Z][A-Za-z0-9]+)_/$1/gee unless $asis; | |
940 | print $out $_; | |
67d7b5ef | 941 | } |
67d7b5ef | 942 | } |
67d7b5ef JH |
943 | __END__ |
944 | ||
945 | =head1 NAME | |
946 | ||
947 | enc2xs -- Perl Encode Module Generator | |
948 | ||
949 | =head1 SYNOPSIS | |
950 | ||
67d7b5ef | 951 | enc2xs -[options] |
aae85ceb DK |
952 | enc2xs -M ModName mapfiles... |
953 | enc2xs -C | |
67d7b5ef JH |
954 | |
955 | =head1 DESCRIPTION | |
956 | ||
957 | F<enc2xs> builds a Perl extension for use by Encode from either | |
958 | Unicode Character Mapping files (.ucm) or Tcl Encoding Files | |
959 | (.enc) Besides internally used during the build process of Encode | |
960 | module, you can use F<enc2xs> to add your own encoding to perl. No | |
961 | knowledge on XS is necessary. | |
962 | ||
963 | =head1 Quick Guide | |
964 | ||
965 | If what you want to know as little about Perl possible but needs to | |
966 | add a new encoding, just read this chapter and forget the rest. | |
967 | ||
968 | =over 4 | |
969 | ||
970 | =item 0. | |
971 | ||
972 | Have a .ucm file ready. You can get it from somewhere or you can | |
973 | write your own from scratch or you can grab one from Encode | |
974 | distribution and customize. For UCM format, see the next Chapter. | |
975 | In the example below, I'll call my theoretical encoding myascii, | |
976 | defined inI<my.ucm>. C<$> is a shell prompt. | |
977 | ||
978 | $ ls -F | |
979 | my.ucm | |
980 | ||
981 | =item 1. | |
982 | ||
983 | Issue a command as follows; | |
984 | ||
985 | $ enc2xs -M My my.ucm | |
3ef515df JH |
986 | generating Makefile.PL |
987 | generating My.pm | |
988 | generating README | |
989 | generating Changes | |
67d7b5ef JH |
990 | |
991 | Now take a look at your current directory. It should look like this. | |
992 | ||
993 | $ ls -F | |
994 | Makefile.PL My.pm my.ucm t/ | |
995 | ||
996 | The following files are created. | |
997 | ||
998 | Makefle.PL - MakeMaker script | |
999 | My.pm - Encode Submodule | |
1000 | t/My.t - test file | |
1001 | ||
037b88d6 JH |
1002 | =item 1.1. |
1003 | ||
1004 | If you want *.ucm installed together with the modules, do as follows; | |
1005 | ||
1006 | $ mkdir Encode | |
1007 | $ mv *.ucm Encode | |
1008 | $ enc2xs -M My Encode/*ucm | |
1009 | ||
67d7b5ef JH |
1010 | =item 2. |
1011 | ||
1012 | Edit the files generated. You don't have to if you have no time AND no | |
1013 | intention to give it to someone else. But it is a good idea to edit | |
1014 | pod and add more tests. | |
1015 | ||
1016 | =item 3. | |
1017 | ||
1018 | Now issue a command all Perl Mongers love; | |
1019 | ||
1020 | $ perl5.7.3 Makefile.PL | |
1021 | Writing Makefile for Encode::My | |
1022 | ||
1023 | =item 4. | |
1024 | ||
1025 | Now all you have to do is make. | |
1026 | ||
1027 | $ make | |
1028 | cp My.pm blib/lib/Encode/My.pm | |
1029 | /usr/local/bin/perl /usr/local/bin/enc2xs -Q -O \ | |
1030 | -o encode_t.c -f encode_t.fnm | |
1031 | Reading myascii (myascii) | |
1032 | Writing compiled form | |
1033 | 128 bytes in string tables | |
1034 | 384 bytes (25%) saved spotting duplicates | |
1035 | 1 bytes (99.2%) saved using substrings | |
1036 | .... | |
1037 | chmod 644 blib/arch/auto/Encode/My/My.bs | |
1038 | $ | |
1039 | ||
1040 | The time it takes varies how fast your machine is and how large your | |
1041 | encoding is. Unless you are working on something big like euc-tw, it | |
1042 | won't take too long. | |
1043 | ||
1044 | =item 5. | |
1045 | ||
1046 | You can "make install" already but you should test first. | |
1047 | ||
1048 | $ make test | |
1049 | PERL_DL_NONLAZY=1 /usr/local/bin/perl -Iblib/arch -Iblib/lib \ | |
1050 | -e 'use Test::Harness qw(&runtests $verbose); \ | |
1051 | $verbose=0; runtests @ARGV;' t/*.t | |
1052 | t/My....ok | |
1053 | All tests successful. | |
1054 | Files=1, Tests=2, 0 wallclock secs | |
1055 | ( 0.09 cusr + 0.01 csys = 0.09 CPU) | |
1056 | ||
1057 | =item 6. | |
1058 | ||
1059 | If you are content with the test result, just "make install" | |
1060 | ||
aae85ceb DK |
1061 | =item 7. |
1062 | ||
1063 | If you want to add your encoding to Encode demand-loading list | |
1064 | (so you don't have to "use Encode::YourEncoding"), run | |
1065 | ||
1066 | enc2xs -C | |
1067 | ||
1068 | to update Encode::ConfigLocal, a module that controls local settings. | |
1069 | After that, "use Encode;" is enough to load your encodings on demand. | |
1070 | ||
67d7b5ef JH |
1071 | =back |
1072 | ||
1073 | =head1 The Unicode Character Map | |
1074 | ||
1075 | Encode uses The Unicode Character Map (UCM) for source character | |
1076 | mappings. This format is used by ICU package of IBM and adopted by | |
1077 | Nick Ing-Simmons. Since UCM is more flexible than Tcl's Encoding Map | |
1078 | and far more user-friendly, This is the recommended formet for | |
1079 | Encode now. | |
1080 | ||
1081 | UCM file looks like this. | |
1082 | ||
1083 | # | |
1084 | # Comments | |
1085 | # | |
1086 | <code_set_name> "US-ascii" # Required | |
1087 | <code_set_alias> "ascii" # Optional | |
1088 | <mb_cur_min> 1 # Required; usually 1 | |
1089 | <mb_cur_max> 1 # Max. # of bytes/char | |
1090 | <subchar> \x3F # Substitution char | |
1091 | # | |
1092 | CHARMAP | |
1093 | <U0000> \x00 |0 # <control> | |
1094 | <U0001> \x01 |0 # <control> | |
1095 | <U0002> \x02 |0 # <control> | |
1096 | .... | |
1097 | <U007C> \x7C |0 # VERTICAL LINE | |
1098 | <U007D> \x7D |0 # RIGHT CURLY BRACKET | |
1099 | <U007E> \x7E |0 # TILDE | |
1100 | <U007F> \x7F |0 # <control> | |
1101 | END CHARMAP | |
1102 | ||
1103 | =over 4 | |
1104 | ||
1105 | =item * | |
1106 | ||
1107 | Anything that follows C<#> is treated as comments. | |
1108 | ||
1109 | =item * | |
1110 | ||
1111 | The header section continues until CHARMAP. This section Has a form of | |
1112 | I<E<lt>keywordE<gt> value>, one at a line. For a value, strings must | |
1113 | be quoted. Barewords are treated as numbers. I<\xXX> represents a | |
1114 | byte. | |
1115 | ||
1116 | Most of the keywords are self-explanatory. I<subchar> means | |
1117 | substitution character, not subcharacter. When you decode a Unicode | |
1118 | sequence to this encoding but no matching character is found, the byte | |
1119 | sequence defined here will be used. For most cases, the value here is | |
1120 | \x3F, in ASCII this is a question mark. | |
1121 | ||
1122 | =item * | |
1123 | ||
1124 | CHARMAP starts the character map section. Each line has a form as | |
1125 | follows; | |
1126 | ||
1127 | <UXXXX> \xXX.. |0 # comment | |
1128 | ^ ^ ^ | |
1129 | | | +- Fallback flag | |
1130 | | +-------- Encoded byte sequence | |
1131 | +-------------- Unicode Character ID in hex | |
1132 | ||
1133 | The format is roughly the same as a header section except for fallback | |
1134 | flag. It is | followed by 0..3. And their meaning as follows | |
1135 | ||
1136 | =over 2 | |
1137 | ||
1138 | =item |0 | |
1139 | ||
1140 | Round trip safe. A character decoded to Unicode encodes back to the | |
1141 | same byte sequence. most character belong to this. | |
1142 | ||
1143 | =item |1 | |
1144 | ||
1145 | Fallback for unicode -> encoding. When seen, enc2xs adds this | |
1146 | character for encode map only | |
1147 | ||
1148 | =item |2 | |
1149 | ||
1150 | Skip sub-char mapping should there be no code point. | |
1151 | ||
1152 | =item |3 | |
1153 | ||
1154 | Fallback for encoding -> unicode. When seen, enc2xs adds this | |
1155 | character for decode map only | |
1156 | ||
1157 | =back | |
1158 | ||
1159 | =item * | |
1160 | ||
1161 | And finally, END OF CHARMAP ends the section. | |
1162 | ||
1163 | =back | |
1164 | ||
1165 | Needless to say, if you are manually creating a UCM file, you should | |
1166 | copy ascii.ucm or existing encoding which is close to yours than write | |
1167 | your own from scratch. | |
1168 | ||
1169 | When you do so, make sure you leave at least B<U0000> to B<U0020> as | |
1170 | is, unless your environment is on EBCDIC. | |
1171 | ||
1172 | B<CAVEAT>: not all features in UCM are implemented. For example, | |
1173 | icu:state is not used. Because of that, you need to write a perl | |
1174 | module if you want to support algorithmical encodings, notablly | |
1175 | ISO-2022 series. Such modules include L<Encode::JP::2022_JP>, | |
1176 | L<Encode::KR::2022_KR>, and L<Encode::TW::HZ>. | |
1177 | ||
1178 | =head1 Bookmarks | |
1179 | ||
1180 | ICU Home Page | |
1181 | L<http://oss.software.ibm.com/icu/> | |
1182 | ||
1183 | ICU Character Mapping Tables | |
1184 | L<http://oss.software.ibm.com/icu/charset/> | |
1185 | ||
1186 | ICU:Conversion Data | |
1187 | L<http://oss.software.ibm.com/icu/userguide/conversion-data.html> | |
1188 | ||
1189 | =head1 SEE ALSO | |
1190 | ||
1191 | L<Encode>, | |
1192 | L<perlmod>, | |
1193 | L<perlpod> | |
1194 | ||
1195 | =cut | |
1196 | ||
1197 | # -Q to disable the duplicate codepoint test | |
1198 | # -S make mapping errors fatal | |
1199 | # -q to remove comments written to output files | |
1200 | # -O to enable the (brute force) substring optimiser | |
1201 | # -o <output> to specify the output file name (else it's the first arg) | |
1202 | # -f <inlist> to give a file with a list of input files (else use the args) | |
1203 | # -n <name> to name the encoding (else use the basename of the input file. | |
1204 | ||
1205 | With %seen holding array refs: | |
1206 | ||
1207 | 865.66 real 28.80 user 8.79 sys | |
1208 | 7904 maximum resident set size | |
1209 | 1356 average shared memory size | |
1210 | 18566 average unshared data size | |
1211 | 229 average unshared stack size | |
1212 | 46080 page reclaims | |
1213 | 33373 page faults | |
1214 | ||
1215 | With %seen holding simple scalars: | |
1216 | ||
1217 | 342.16 real 27.11 user 3.54 sys | |
1218 | 8388 maximum resident set size | |
1219 | 1394 average shared memory size | |
1220 | 14969 average unshared data size | |
1221 | 236 average unshared stack size | |
1222 | 28159 page reclaims | |
1223 | 9839 page faults | |
1224 | ||
1225 | Yes, 5 minutes is faster than 15. Above is for CP936 in CN. Only difference is | |
1226 | how %seen is storing things its seen. So it is pathalogically bad on a 16M | |
1227 | RAM machine, but it's going to help even on modern machines. | |
1228 | Swapping is bad, m'kay :-) |