| Commit | Line | Data |
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| 3270c621 |
1 | # EXTRACT VARIOUSLY DELIMITED TEXT SEQUENCES FROM STRINGS. |
| 2 | # FOR FULL DOCUMENTATION SEE Balanced.pod |
| 3 | |
| 4 | use 5.005; |
| 5 | use strict; |
| 6 | |
| 7 | package Text::Balanced; |
| 8 | |
| 9 | use Exporter; |
| 10 | use SelfLoader; |
| 11 | use vars qw { $VERSION @ISA %EXPORT_TAGS }; |
| 12 | |
| 9686a75b |
13 | $VERSION = '1.84'; |
| 3270c621 |
14 | @ISA = qw ( Exporter ); |
| 15 | |
| 16 | %EXPORT_TAGS = ( ALL => [ qw( |
| 17 | &extract_delimited |
| 18 | &extract_bracketed |
| 19 | &extract_quotelike |
| 20 | &extract_codeblock |
| 21 | &extract_variable |
| 22 | &extract_tagged |
| 23 | &extract_multiple |
| 24 | |
| 25 | &gen_delimited_pat |
| 26 | &gen_extract_tagged |
| 27 | |
| 28 | &delimited_pat |
| 29 | ) ] ); |
| 30 | |
| 31 | Exporter::export_ok_tags('ALL'); |
| 32 | |
| 33 | # PROTOTYPES |
| 34 | |
| 35 | sub _match_bracketed($$$$$$); |
| 36 | sub _match_variable($$); |
| 37 | sub _match_codeblock($$$$$$$); |
| 38 | sub _match_quotelike($$$$); |
| 39 | |
| 40 | # HANDLE RETURN VALUES IN VARIOUS CONTEXTS |
| 41 | |
| 42 | sub _failmsg { |
| 43 | my ($message, $pos) = @_; |
| 44 | $@ = bless { error=>$message, pos=>$pos }, "Text::Balanced::ErrorMsg"; |
| 45 | } |
| 46 | |
| 47 | sub _fail |
| 48 | { |
| 49 | my ($wantarray, $textref, $message, $pos) = @_; |
| 50 | _failmsg $message, $pos if $message; |
| 51 | return ("",$$textref,"") if $wantarray; |
| 52 | return undef; |
| 53 | } |
| 54 | |
| 55 | sub _succeed |
| 56 | { |
| 57 | $@ = undef; |
| 58 | my ($wantarray,$textref) = splice @_, 0, 2; |
| 59 | my ($extrapos, $extralen) = @_>18 ? splice(@_, -2, 2) : (0,0); |
| 60 | my ($startlen) = $_[5]; |
| 61 | my $remainderpos = $_[2]; |
| 62 | if ($wantarray) |
| 63 | { |
| 64 | my @res; |
| 65 | while (my ($from, $len) = splice @_, 0, 2) |
| 66 | { |
| 67 | push @res, substr($$textref,$from,$len); |
| 68 | } |
| 69 | if ($extralen) { # CORRECT FILLET |
| 70 | my $extra = substr($res[0], $extrapos-$startlen, $extralen, "\n"); |
| 71 | $res[1] = "$extra$res[1]"; |
| 72 | eval { substr($$textref,$remainderpos,0) = $extra; |
| 73 | substr($$textref,$extrapos,$extralen,"\n")} ; |
| 74 | #REARRANGE HERE DOC AND FILLET IF POSSIBLE |
| 75 | pos($$textref) = $remainderpos-$extralen+1; # RESET \G |
| 76 | } |
| 77 | else { |
| 78 | pos($$textref) = $remainderpos; # RESET \G |
| 79 | } |
| 80 | return @res; |
| 81 | } |
| 82 | else |
| 83 | { |
| 84 | my $match = substr($$textref,$_[0],$_[1]); |
| 85 | substr($match,$extrapos-$_[0]-$startlen,$extralen,"") if $extralen; |
| 86 | my $extra = $extralen |
| 87 | ? substr($$textref, $extrapos, $extralen)."\n" : ""; |
| 88 | eval {substr($$textref,$_[4],$_[1]+$_[5])=$extra} ; #CHOP OUT PREFIX & MATCH, IF POSSIBLE |
| 89 | pos($$textref) = $_[4]; # RESET \G |
| 90 | return $match; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | # BUILD A PATTERN MATCHING A SIMPLE DELIMITED STRING |
| 95 | |
| 96 | sub gen_delimited_pat($;$) # ($delimiters;$escapes) |
| 97 | { |
| 98 | my ($dels, $escs) = @_; |
| 99 | return "" unless $dels =~ /\S/; |
| 100 | $escs = '\\' unless $escs; |
| 101 | $escs .= substr($escs,-1) x (length($dels)-length($escs)); |
| 102 | my @pat = (); |
| 103 | my $i; |
| 104 | for ($i=0; $i<length $dels; $i++) |
| 105 | { |
| 106 | my $del = quotemeta substr($dels,$i,1); |
| 107 | my $esc = quotemeta substr($escs,$i,1); |
| 108 | if ($del eq $esc) |
| 109 | { |
| 110 | push @pat, "$del(?:[^$del]*(?:(?:$del$del)[^$del]*)*)$del"; |
| 111 | } |
| 112 | else |
| 113 | { |
| 114 | push @pat, "$del(?:[^$esc$del]*(?:$esc.[^$esc$del]*)*)$del"; |
| 115 | } |
| 116 | } |
| 117 | my $pat = join '|', @pat; |
| 118 | return "(?:$pat)"; |
| 119 | } |
| 120 | |
| 121 | *delimited_pat = \&gen_delimited_pat; |
| 122 | |
| 123 | |
| 124 | # THE EXTRACTION FUNCTIONS |
| 125 | |
| 126 | sub extract_delimited (;$$$$) |
| 127 | { |
| 128 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 129 | my $wantarray = wantarray; |
| 130 | my $del = defined $_[1] ? $_[1] : qq{\'\"\`}; |
| 131 | my $pre = defined $_[2] ? $_[2] : '\s*'; |
| 132 | my $esc = defined $_[3] ? $_[3] : qq{\\}; |
| 133 | my $pat = gen_delimited_pat($del, $esc); |
| 134 | my $startpos = pos $$textref || 0; |
| 135 | return _fail($wantarray, $textref, "Not a delimited pattern", 0) |
| 136 | unless $$textref =~ m/\G($pre)($pat)/gc; |
| 137 | my $prelen = length($1); |
| 138 | my $matchpos = $startpos+$prelen; |
| 139 | my $endpos = pos $$textref; |
| 140 | return _succeed $wantarray, $textref, |
| 141 | $matchpos, $endpos-$matchpos, # MATCH |
| 142 | $endpos, length($$textref)-$endpos, # REMAINDER |
| 143 | $startpos, $prelen; # PREFIX |
| 144 | } |
| 145 | |
| 146 | sub extract_bracketed (;$$$) |
| 147 | { |
| 148 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 149 | my $ldel = defined $_[1] ? $_[1] : '{([<'; |
| 150 | my $pre = defined $_[2] ? $_[2] : '\s*'; |
| 151 | my $wantarray = wantarray; |
| 152 | my $qdel = ""; |
| 153 | my $quotelike; |
| 154 | $ldel =~ s/'//g and $qdel .= q{'}; |
| 155 | $ldel =~ s/"//g and $qdel .= q{"}; |
| 156 | $ldel =~ s/`//g and $qdel .= q{`}; |
| 157 | $ldel =~ s/q//g and $quotelike = 1; |
| 158 | $ldel =~ tr/[](){}<>\0-\377/[[(({{<</ds; |
| 159 | my $rdel = $ldel; |
| 160 | unless ($rdel =~ tr/[({</])}>/) |
| 161 | { |
| 162 | return _fail $wantarray, $textref, |
| 163 | "Did not find a suitable bracket in delimiter: \"$_[1]\"", |
| 164 | 0; |
| 165 | } |
| 166 | my $posbug = pos; |
| 167 | $ldel = join('|', map { quotemeta $_ } split('', $ldel)); |
| 168 | $rdel = join('|', map { quotemeta $_ } split('', $rdel)); |
| 169 | pos = $posbug; |
| 170 | |
| 171 | my $startpos = pos $$textref || 0; |
| 172 | my @match = _match_bracketed($textref,$pre, $ldel, $qdel, $quotelike, $rdel); |
| 173 | |
| 174 | return _fail ($wantarray, $textref) unless @match; |
| 175 | |
| 176 | return _succeed ( $wantarray, $textref, |
| 177 | $match[2], $match[5]+2, # MATCH |
| 178 | @match[8,9], # REMAINDER |
| 179 | @match[0,1], # PREFIX |
| 180 | ); |
| 181 | } |
| 182 | |
| 183 | sub _match_bracketed($$$$$$) # $textref, $pre, $ldel, $qdel, $quotelike, $rdel |
| 184 | { |
| 185 | my ($textref, $pre, $ldel, $qdel, $quotelike, $rdel) = @_; |
| 186 | my ($startpos, $ldelpos, $endpos) = (pos $$textref = pos $$textref||0); |
| 187 | unless ($$textref =~ m/\G$pre/gc) |
| 188 | { |
| 189 | _failmsg "Did not find prefix: /$pre/", $startpos; |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | $ldelpos = pos $$textref; |
| 194 | |
| 195 | unless ($$textref =~ m/\G($ldel)/gc) |
| 196 | { |
| 197 | _failmsg "Did not find opening bracket after prefix: \"$pre\"", |
| 198 | pos $$textref; |
| 199 | pos $$textref = $startpos; |
| 200 | return; |
| 201 | } |
| 202 | |
| 203 | my @nesting = ( $1 ); |
| 204 | my $textlen = length $$textref; |
| 205 | while (pos $$textref < $textlen) |
| 206 | { |
| 207 | next if $$textref =~ m/\G\\./gcs; |
| 208 | |
| 209 | if ($$textref =~ m/\G($ldel)/gc) |
| 210 | { |
| 211 | push @nesting, $1; |
| 212 | } |
| 213 | elsif ($$textref =~ m/\G($rdel)/gc) |
| 214 | { |
| 215 | my ($found, $brackettype) = ($1, $1); |
| 216 | if ($#nesting < 0) |
| 217 | { |
| 218 | _failmsg "Unmatched closing bracket: \"$found\"", |
| 219 | pos $$textref; |
| 220 | pos $$textref = $startpos; |
| 221 | return; |
| 222 | } |
| 223 | my $expected = pop(@nesting); |
| 224 | $expected =~ tr/({[</)}]>/; |
| 225 | if ($expected ne $brackettype) |
| 226 | { |
| 227 | _failmsg qq{Mismatched closing bracket: expected "$expected" but found "$found"}, |
| 228 | pos $$textref; |
| 229 | pos $$textref = $startpos; |
| 230 | return; |
| 231 | } |
| 232 | last if $#nesting < 0; |
| 233 | } |
| 234 | elsif ($qdel && $$textref =~ m/\G([$qdel])/gc) |
| 235 | { |
| 9686a75b |
236 | $$textref =~ m/\G[^\\$1]*(?:\\.[^\\$1]*)*(\Q$1\E)/gsc and next; |
| 3270c621 |
237 | _failmsg "Unmatched embedded quote ($1)", |
| 238 | pos $$textref; |
| 239 | pos $$textref = $startpos; |
| 240 | return; |
| 241 | } |
| 242 | elsif ($quotelike && _match_quotelike($textref,"",1,0)) |
| 243 | { |
| 244 | next; |
| 245 | } |
| 246 | |
| 247 | else { $$textref =~ m/\G(?:[a-zA-Z0-9]+|.)/gcs } |
| 248 | } |
| 249 | if ($#nesting>=0) |
| 250 | { |
| 251 | _failmsg "Unmatched opening bracket(s): " |
| 252 | . join("..",@nesting)."..", |
| 253 | pos $$textref; |
| 254 | pos $$textref = $startpos; |
| 255 | return; |
| 256 | } |
| 257 | |
| 258 | $endpos = pos $$textref; |
| 259 | |
| 260 | return ( |
| 261 | $startpos, $ldelpos-$startpos, # PREFIX |
| 262 | $ldelpos, 1, # OPENING BRACKET |
| 263 | $ldelpos+1, $endpos-$ldelpos-2, # CONTENTS |
| 264 | $endpos-1, 1, # CLOSING BRACKET |
| 265 | $endpos, length($$textref)-$endpos, # REMAINDER |
| 266 | ); |
| 267 | } |
| 268 | |
| 269 | sub revbracket($) |
| 270 | { |
| 271 | my $brack = reverse $_[0]; |
| 272 | $brack =~ tr/[({</])}>/; |
| 273 | return $brack; |
| 274 | } |
| 275 | |
| 276 | my $XMLNAME = q{[a-zA-Z_:][a-zA-Z0-9_:.-]*}; |
| 277 | |
| 278 | sub extract_tagged (;$$$$$) # ($text, $opentag, $closetag, $pre, \%options) |
| 279 | { |
| 280 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 281 | my $ldel = $_[1]; |
| 282 | my $rdel = $_[2]; |
| 283 | my $pre = defined $_[3] ? $_[3] : '\s*'; |
| 284 | my %options = defined $_[4] ? %{$_[4]} : (); |
| 285 | my $omode = defined $options{fail} ? $options{fail} : ''; |
| 286 | my $bad = ref($options{reject}) eq 'ARRAY' ? join('|', @{$options{reject}}) |
| 287 | : defined($options{reject}) ? $options{reject} |
| 288 | : '' |
| 289 | ; |
| 290 | my $ignore = ref($options{ignore}) eq 'ARRAY' ? join('|', @{$options{ignore}}) |
| 291 | : defined($options{ignore}) ? $options{ignore} |
| 292 | : '' |
| 293 | ; |
| 294 | |
| 295 | if (!defined $ldel) { $ldel = '<\w+(?:' . gen_delimited_pat(q{'"}) . '|[^>])*>'; } |
| 296 | $@ = undef; |
| 297 | |
| 298 | my @match = _match_tagged($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore); |
| 299 | |
| 300 | return _fail(wantarray, $textref) unless @match; |
| 301 | return _succeed wantarray, $textref, |
| 302 | $match[2], $match[3]+$match[5]+$match[7], # MATCH |
| 303 | @match[8..9,0..1,2..7]; # REM, PRE, BITS |
| 304 | } |
| 305 | |
| 306 | sub _match_tagged # ($$$$$$$) |
| 307 | { |
| 308 | my ($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore) = @_; |
| 309 | my $rdelspec; |
| 310 | |
| 311 | my ($startpos, $opentagpos, $textpos, $parapos, $closetagpos, $endpos) = ( pos($$textref) = pos($$textref)||0 ); |
| 312 | |
| 313 | unless ($$textref =~ m/\G($pre)/gc) |
| 314 | { |
| 315 | _failmsg "Did not find prefix: /$pre/", pos $$textref; |
| 316 | goto failed; |
| 317 | } |
| 318 | |
| 319 | $opentagpos = pos($$textref); |
| 320 | |
| 321 | unless ($$textref =~ m/\G$ldel/gc) |
| 322 | { |
| 323 | _failmsg "Did not find opening tag: /$ldel/", pos $$textref; |
| 324 | goto failed; |
| 325 | } |
| 326 | |
| 327 | $textpos = pos($$textref); |
| 328 | |
| 329 | if (!defined $rdel) |
| 330 | { |
| 331 | $rdelspec = $&; |
| 332 | unless ($rdelspec =~ s/\A([[(<{]+)($XMLNAME).*/ quotemeta "$1\/$2". revbracket($1) /oes) |
| 333 | { |
| 334 | _failmsg "Unable to construct closing tag to match: $rdel", |
| 335 | pos $$textref; |
| 336 | goto failed; |
| 337 | } |
| 338 | } |
| 339 | else |
| 340 | { |
| 341 | $rdelspec = eval "qq{$rdel}"; |
| 342 | } |
| 343 | |
| 344 | while (pos($$textref) < length($$textref)) |
| 345 | { |
| 346 | next if $$textref =~ m/\G\\./gc; |
| 347 | |
| 348 | if ($$textref =~ m/\G(\n[ \t]*\n)/gc ) |
| 349 | { |
| 350 | $parapos = pos($$textref) - length($1) |
| 351 | unless defined $parapos; |
| 352 | } |
| 353 | elsif ($$textref =~ m/\G($rdelspec)/gc ) |
| 354 | { |
| 355 | $closetagpos = pos($$textref)-length($1); |
| 356 | goto matched; |
| 357 | } |
| 358 | elsif ($ignore && $$textref =~ m/\G(?:$ignore)/gc) |
| 359 | { |
| 360 | next; |
| 361 | } |
| 362 | elsif ($bad && $$textref =~ m/\G($bad)/gcs) |
| 363 | { |
| 364 | pos($$textref) -= length($1); # CUT OFF WHATEVER CAUSED THE SHORTNESS |
| 365 | goto short if ($omode eq 'PARA' || $omode eq 'MAX'); |
| 366 | _failmsg "Found invalid nested tag: $1", pos $$textref; |
| 367 | goto failed; |
| 368 | } |
| 369 | elsif ($$textref =~ m/\G($ldel)/gc) |
| 370 | { |
| 371 | my $tag = $1; |
| 372 | pos($$textref) -= length($tag); # REWIND TO NESTED TAG |
| 373 | unless (_match_tagged(@_)) # MATCH NESTED TAG |
| 374 | { |
| 375 | goto short if $omode eq 'PARA' || $omode eq 'MAX'; |
| 376 | _failmsg "Found unbalanced nested tag: $tag", |
| 377 | pos $$textref; |
| 378 | goto failed; |
| 379 | } |
| 380 | } |
| 381 | else { $$textref =~ m/./gcs } |
| 382 | } |
| 383 | |
| 384 | short: |
| 385 | $closetagpos = pos($$textref); |
| 386 | goto matched if $omode eq 'MAX'; |
| 387 | goto failed unless $omode eq 'PARA'; |
| 388 | |
| 389 | if (defined $parapos) { pos($$textref) = $parapos } |
| 390 | else { $parapos = pos($$textref) } |
| 391 | |
| 392 | return ( |
| 393 | $startpos, $opentagpos-$startpos, # PREFIX |
| 394 | $opentagpos, $textpos-$opentagpos, # OPENING TAG |
| 395 | $textpos, $parapos-$textpos, # TEXT |
| 396 | $parapos, 0, # NO CLOSING TAG |
| 397 | $parapos, length($$textref)-$parapos, # REMAINDER |
| 398 | ); |
| 399 | |
| 400 | matched: |
| 401 | $endpos = pos($$textref); |
| 402 | return ( |
| 403 | $startpos, $opentagpos-$startpos, # PREFIX |
| 404 | $opentagpos, $textpos-$opentagpos, # OPENING TAG |
| 405 | $textpos, $closetagpos-$textpos, # TEXT |
| 406 | $closetagpos, $endpos-$closetagpos, # CLOSING TAG |
| 407 | $endpos, length($$textref)-$endpos, # REMAINDER |
| 408 | ); |
| 409 | |
| 410 | failed: |
| 411 | _failmsg "Did not find closing tag", pos $$textref unless $@; |
| 412 | pos($$textref) = $startpos; |
| 413 | return; |
| 414 | } |
| 415 | |
| 416 | sub extract_variable (;$$) |
| 417 | { |
| 418 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 419 | return ("","","") unless defined $$textref; |
| 420 | my $pre = defined $_[1] ? $_[1] : '\s*'; |
| 421 | |
| 422 | my @match = _match_variable($textref,$pre); |
| 423 | |
| 424 | return _fail wantarray, $textref unless @match; |
| 425 | |
| 426 | return _succeed wantarray, $textref, |
| 427 | @match[2..3,4..5,0..1]; # MATCH, REMAINDER, PREFIX |
| 428 | } |
| 429 | |
| 430 | sub _match_variable($$) |
| 431 | { |
| 432 | my ($textref, $pre) = @_; |
| 433 | my $startpos = pos($$textref) = pos($$textref)||0; |
| 434 | unless ($$textref =~ m/\G($pre)/gc) |
| 435 | { |
| 436 | _failmsg "Did not find prefix: /$pre/", pos $$textref; |
| 437 | return; |
| 438 | } |
| 439 | my $varpos = pos($$textref); |
| 440 | unless ($$textref =~ m/\G(\$#?|[*\@\%]|\\&)+/gc) |
| 441 | { |
| 442 | _failmsg "Did not find leading dereferencer", pos $$textref; |
| 443 | pos $$textref = $startpos; |
| 444 | return; |
| 445 | } |
| 446 | |
| 447 | unless ($$textref =~ m/\G\s*(?:::|')?(?:[_a-z]\w*(?:::|'))*[_a-z]\w*/gci |
| 448 | or _match_codeblock($textref, "", '\{', '\}', '\{', '\}', 0)) |
| 449 | { |
| 450 | _failmsg "Bad identifier after dereferencer", pos $$textref; |
| 451 | pos $$textref = $startpos; |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | while (1) |
| 456 | { |
| 457 | next if _match_codeblock($textref, |
| 458 | qr/\s*->\s*(?:[a-zA-Z]\w+\s*)?/, |
| 459 | qr/[({[]/, qr/[)}\]]/, |
| 460 | qr/[({[]/, qr/[)}\]]/, 0); |
| 461 | next if _match_codeblock($textref, |
| 462 | qr/\s*/, qr/[{[]/, qr/[}\]]/, |
| 463 | qr/[{[]/, qr/[}\]]/, 0); |
| 464 | next if _match_variable($textref,'\s*->\s*'); |
| 465 | next if $$textref =~ m/\G\s*->\s*\w+(?![{([])/gc; |
| 466 | last; |
| 467 | } |
| 468 | |
| 469 | my $endpos = pos($$textref); |
| 470 | return ($startpos, $varpos-$startpos, |
| 471 | $varpos, $endpos-$varpos, |
| 472 | $endpos, length($$textref)-$endpos |
| 473 | ); |
| 474 | } |
| 475 | |
| 476 | sub extract_codeblock (;$$$$$) |
| 477 | { |
| 478 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 479 | my $wantarray = wantarray; |
| 480 | my $ldel_inner = defined $_[1] ? $_[1] : '{'; |
| 481 | my $pre = defined $_[2] ? $_[2] : '\s*'; |
| 482 | my $ldel_outer = defined $_[3] ? $_[3] : $ldel_inner; |
| 483 | my $rd = $_[4]; |
| 484 | my $rdel_inner = $ldel_inner; |
| 485 | my $rdel_outer = $ldel_outer; |
| 486 | my $posbug = pos; |
| 487 | for ($ldel_inner, $ldel_outer) { tr/[]()<>{}\0-\377/[[((<<{{/ds } |
| 488 | for ($rdel_inner, $rdel_outer) { tr/[]()<>{}\0-\377/]]))>>}}/ds } |
| 489 | for ($ldel_inner, $ldel_outer, $rdel_inner, $rdel_outer) |
| 490 | { |
| 491 | $_ = '('.join('|',map { quotemeta $_ } split('',$_)).')' |
| 492 | } |
| 493 | pos = $posbug; |
| 494 | |
| 495 | my @match = _match_codeblock($textref, $pre, |
| 496 | $ldel_outer, $rdel_outer, |
| 497 | $ldel_inner, $rdel_inner, |
| 498 | $rd); |
| 499 | return _fail($wantarray, $textref) unless @match; |
| 500 | return _succeed($wantarray, $textref, |
| 501 | @match[2..3,4..5,0..1] # MATCH, REMAINDER, PREFIX |
| 502 | ); |
| 503 | |
| 504 | } |
| 505 | |
| 506 | sub _match_codeblock($$$$$$$) |
| 507 | { |
| 508 | my ($textref, $pre, $ldel_outer, $rdel_outer, $ldel_inner, $rdel_inner, $rd) = @_; |
| 509 | my $startpos = pos($$textref) = pos($$textref) || 0; |
| 510 | unless ($$textref =~ m/\G($pre)/gc) |
| 511 | { |
| 512 | _failmsg qq{Did not match prefix /$pre/ at"} . |
| 513 | substr($$textref,pos($$textref),20) . |
| 514 | q{..."}, |
| 515 | pos $$textref; |
| 516 | return; |
| 517 | } |
| 518 | my $codepos = pos($$textref); |
| 519 | unless ($$textref =~ m/\G($ldel_outer)/gc) # OUTERMOST DELIMITER |
| 520 | { |
| 521 | _failmsg qq{Did not find expected opening bracket at "} . |
| 522 | substr($$textref,pos($$textref),20) . |
| 523 | q{..."}, |
| 524 | pos $$textref; |
| 525 | pos $$textref = $startpos; |
| 526 | return; |
| 527 | } |
| 528 | my $closing = $1; |
| 529 | $closing =~ tr/([<{/)]>}/; |
| 530 | my $matched; |
| 531 | my $patvalid = 1; |
| 532 | while (pos($$textref) < length($$textref)) |
| 533 | { |
| 534 | $matched = ''; |
| 535 | if ($rd && $$textref =~ m#\G(\Q(?)\E|\Q(s?)\E|\Q(s)\E)#gc) |
| 536 | { |
| 537 | $patvalid = 0; |
| 538 | next; |
| 539 | } |
| 540 | |
| 541 | if ($$textref =~ m/\G\s*#.*/gc) |
| 542 | { |
| 543 | next; |
| 544 | } |
| 545 | |
| 546 | if ($$textref =~ m/\G\s*($rdel_outer)/gc) |
| 547 | { |
| 548 | unless ($matched = ($closing && $1 eq $closing) ) |
| 549 | { |
| 550 | next if $1 eq '>'; # MIGHT BE A "LESS THAN" |
| 551 | _failmsg q{Mismatched closing bracket at "} . |
| 552 | substr($$textref,pos($$textref),20) . |
| 553 | qq{...". Expected '$closing'}, |
| 554 | pos $$textref; |
| 555 | } |
| 556 | last; |
| 557 | } |
| 558 | |
| 559 | if (_match_variable($textref,'\s*') || |
| 560 | _match_quotelike($textref,'\s*',$patvalid,$patvalid) ) |
| 561 | { |
| 562 | $patvalid = 0; |
| 563 | next; |
| 564 | } |
| 565 | |
| 566 | |
| 567 | # NEED TO COVER MANY MORE CASES HERE!!! |
| 568 | if ($$textref =~ m#\G\s*( [-+*x/%^&|.]=? |
| 569 | | =(?!>) |
| 570 | | (\*\*|&&|\|\||<<|>>)=? |
| 571 | | [!=][~=] |
| 572 | | split|grep|map|return |
| 573 | )#gcx) |
| 574 | { |
| 575 | $patvalid = 1; |
| 576 | next; |
| 577 | } |
| 578 | |
| 579 | if ( _match_codeblock($textref, '\s*', $ldel_inner, $rdel_inner, $ldel_inner, $rdel_inner, $rd) ) |
| 580 | { |
| 581 | $patvalid = 1; |
| 582 | next; |
| 583 | } |
| 584 | |
| 585 | if ($$textref =~ m/\G\s*$ldel_outer/gc) |
| 586 | { |
| 587 | _failmsg q{Improperly nested codeblock at "} . |
| 588 | substr($$textref,pos($$textref),20) . |
| 589 | q{..."}, |
| 590 | pos $$textref; |
| 591 | last; |
| 592 | } |
| 593 | |
| 594 | $patvalid = 0; |
| 595 | $$textref =~ m/\G\s*(\w+|[-=>]>|.|\Z)/gc; |
| 596 | } |
| 597 | continue { $@ = undef } |
| 598 | |
| 599 | unless ($matched) |
| 600 | { |
| 601 | _failmsg 'No match found for opening bracket', pos $$textref |
| 602 | unless $@; |
| 603 | return; |
| 604 | } |
| 605 | |
| 606 | my $endpos = pos($$textref); |
| 607 | return ( $startpos, $codepos-$startpos, |
| 608 | $codepos, $endpos-$codepos, |
| 609 | $endpos, length($$textref)-$endpos, |
| 610 | ); |
| 611 | } |
| 612 | |
| 613 | |
| 614 | my %mods = ( |
| 615 | 'none' => '[cgimsox]*', |
| 616 | 'm' => '[cgimsox]*', |
| 617 | 's' => '[cegimsox]*', |
| 618 | 'tr' => '[cds]*', |
| 619 | 'y' => '[cds]*', |
| 620 | 'qq' => '', |
| 621 | 'qx' => '', |
| 622 | 'qw' => '', |
| 623 | 'qr' => '[imsx]*', |
| 624 | 'q' => '', |
| 625 | ); |
| 626 | |
| 627 | sub extract_quotelike (;$$) |
| 628 | { |
| 629 | my $textref = $_[0] ? \$_[0] : \$_; |
| 630 | my $wantarray = wantarray; |
| 631 | my $pre = defined $_[1] ? $_[1] : '\s*'; |
| 632 | |
| 633 | my @match = _match_quotelike($textref,$pre,1,0); |
| 634 | return _fail($wantarray, $textref) unless @match; |
| 635 | return _succeed($wantarray, $textref, |
| 636 | $match[2], $match[18]-$match[2], # MATCH |
| 637 | @match[18,19], # REMAINDER |
| 638 | @match[0,1], # PREFIX |
| 639 | @match[2..17], # THE BITS |
| 640 | @match[20,21], # ANY FILLET? |
| 641 | ); |
| 642 | }; |
| 643 | |
| 644 | sub _match_quotelike($$$$) # ($textref, $prepat, $allow_raw_match) |
| 645 | { |
| 646 | my ($textref, $pre, $rawmatch, $qmark) = @_; |
| 647 | |
| 648 | my ($textlen,$startpos, |
| 649 | $oppos, |
| 650 | $preld1pos,$ld1pos,$str1pos,$rd1pos, |
| 651 | $preld2pos,$ld2pos,$str2pos,$rd2pos, |
| 652 | $modpos) = ( length($$textref), pos($$textref) = pos($$textref) || 0 ); |
| 653 | |
| 654 | unless ($$textref =~ m/\G($pre)/gc) |
| 655 | { |
| 656 | _failmsg qq{Did not find prefix /$pre/ at "} . |
| 657 | substr($$textref, pos($$textref), 20) . |
| 658 | q{..."}, |
| 659 | pos $$textref; |
| 660 | return; |
| 661 | } |
| 662 | $oppos = pos($$textref); |
| 663 | |
| 664 | my $initial = substr($$textref,$oppos,1); |
| 665 | |
| 666 | if ($initial && $initial =~ m|^[\"\'\`]| |
| 667 | || $rawmatch && $initial =~ m|^/| |
| 668 | || $qmark && $initial =~ m|^\?|) |
| 669 | { |
| 9686a75b |
670 | unless ($$textref =~ m/ \Q$initial\E [^\\$initial]* (\\.[^\\$initial]*)* \Q$initial\E /gcsx) |
| 3270c621 |
671 | { |
| 672 | _failmsg qq{Did not find closing delimiter to match '$initial' at "} . |
| 673 | substr($$textref, $oppos, 20) . |
| 674 | q{..."}, |
| 675 | pos $$textref; |
| 676 | pos $$textref = $startpos; |
| 677 | return; |
| 678 | } |
| 679 | $modpos= pos($$textref); |
| 680 | $rd1pos = $modpos-1; |
| 681 | |
| 682 | if ($initial eq '/' || $initial eq '?') |
| 683 | { |
| 684 | $$textref =~ m/\G$mods{none}/gc |
| 685 | } |
| 686 | |
| 687 | my $endpos = pos($$textref); |
| 688 | return ( |
| 689 | $startpos, $oppos-$startpos, # PREFIX |
| 690 | $oppos, 0, # NO OPERATOR |
| 691 | $oppos, 1, # LEFT DEL |
| 692 | $oppos+1, $rd1pos-$oppos-1, # STR/PAT |
| 693 | $rd1pos, 1, # RIGHT DEL |
| 694 | $modpos, 0, # NO 2ND LDEL |
| 695 | $modpos, 0, # NO 2ND STR |
| 696 | $modpos, 0, # NO 2ND RDEL |
| 697 | $modpos, $endpos-$modpos, # MODIFIERS |
| 698 | $endpos, $textlen-$endpos, # REMAINDER |
| 699 | ); |
| 700 | } |
| 701 | |
| 702 | unless ($$textref =~ m{\G((?:m|s|qq|qx|qw|q|qr|tr|y)\b(?=\s*\S)|<<)}gc) |
| 703 | { |
| 704 | _failmsg q{No quotelike operator found after prefix at "} . |
| 705 | substr($$textref, pos($$textref), 20) . |
| 706 | q{..."}, |
| 707 | pos $$textref; |
| 708 | pos $$textref = $startpos; |
| 709 | return; |
| 710 | } |
| 711 | |
| 712 | my $op = $1; |
| 713 | $preld1pos = pos($$textref); |
| 714 | if ($op eq '<<') { |
| 715 | $ld1pos = pos($$textref); |
| 716 | my $label; |
| 717 | if ($$textref =~ m{\G([A-Za-z_]\w*)}gc) { |
| 718 | $label = $1; |
| 719 | } |
| 720 | elsif ($$textref =~ m{ \G ' ([^'\\]* (?:\\.[^'\\]*)*) ' |
| 721 | | \G " ([^"\\]* (?:\\.[^"\\]*)*) " |
| 722 | | \G ` ([^`\\]* (?:\\.[^`\\]*)*) ` |
| 9686a75b |
723 | }gcsx) { |
| 3270c621 |
724 | $label = $+; |
| 725 | } |
| 726 | else { |
| 727 | $label = ""; |
| 728 | } |
| 729 | my $extrapos = pos($$textref); |
| 730 | $$textref =~ m{.*\n}gc; |
| 731 | $str1pos = pos($$textref); |
| 732 | unless ($$textref =~ m{.*?\n(?=$label\n)}gc) { |
| 733 | _failmsg qq{Missing here doc terminator ('$label') after "} . |
| 734 | substr($$textref, $startpos, 20) . |
| 735 | q{..."}, |
| 736 | pos $$textref; |
| 737 | pos $$textref = $startpos; |
| 738 | return; |
| 739 | } |
| 740 | $rd1pos = pos($$textref); |
| 741 | $$textref =~ m{$label\n}gc; |
| 742 | $ld2pos = pos($$textref); |
| 743 | return ( |
| 744 | $startpos, $oppos-$startpos, # PREFIX |
| 745 | $oppos, length($op), # OPERATOR |
| 746 | $ld1pos, $extrapos-$ld1pos, # LEFT DEL |
| 747 | $str1pos, $rd1pos-$str1pos, # STR/PAT |
| 748 | $rd1pos, $ld2pos-$rd1pos, # RIGHT DEL |
| 749 | $ld2pos, 0, # NO 2ND LDEL |
| 750 | $ld2pos, 0, # NO 2ND STR |
| 751 | $ld2pos, 0, # NO 2ND RDEL |
| 752 | $ld2pos, 0, # NO MODIFIERS |
| 753 | $ld2pos, $textlen-$ld2pos, # REMAINDER |
| 754 | $extrapos, $str1pos-$extrapos, # FILLETED BIT |
| 755 | ); |
| 756 | } |
| 757 | |
| 758 | $$textref =~ m/\G\s*/gc; |
| 759 | $ld1pos = pos($$textref); |
| 760 | $str1pos = $ld1pos+1; |
| 761 | |
| 762 | unless ($$textref =~ m/\G(\S)/gc) # SHOULD USE LOOKAHEAD |
| 763 | { |
| 764 | _failmsg "No block delimiter found after quotelike $op", |
| 765 | pos $$textref; |
| 766 | pos $$textref = $startpos; |
| 767 | return; |
| 768 | } |
| 769 | pos($$textref) = $ld1pos; # HAVE TO DO THIS BECAUSE LOOKAHEAD BROKEN |
| 770 | my ($ldel1, $rdel1) = ("\Q$1","\Q$1"); |
| 771 | if ($ldel1 =~ /[[(<{]/) |
| 772 | { |
| 773 | $rdel1 =~ tr/[({</])}>/; |
| 774 | _match_bracketed($textref,"",$ldel1,"","",$rdel1) |
| 775 | || do { pos $$textref = $startpos; return }; |
| 776 | } |
| 777 | else |
| 778 | { |
| 9686a75b |
779 | $$textref =~ /$ldel1[^\\$ldel1]*(\\.[^\\$ldel1]*)*$ldel1/gcs |
| 3270c621 |
780 | || do { pos $$textref = $startpos; return }; |
| 781 | } |
| 782 | $ld2pos = $rd1pos = pos($$textref)-1; |
| 783 | |
| 784 | my $second_arg = $op =~ /s|tr|y/ ? 1 : 0; |
| 785 | if ($second_arg) |
| 786 | { |
| 787 | my ($ldel2, $rdel2); |
| 788 | if ($ldel1 =~ /[[(<{]/) |
| 789 | { |
| 790 | unless ($$textref =~ /\G\s*(\S)/gc) # SHOULD USE LOOKAHEAD |
| 791 | { |
| 792 | _failmsg "Missing second block for quotelike $op", |
| 793 | pos $$textref; |
| 794 | pos $$textref = $startpos; |
| 795 | return; |
| 796 | } |
| 797 | $ldel2 = $rdel2 = "\Q$1"; |
| 798 | $rdel2 =~ tr/[({</])}>/; |
| 799 | } |
| 800 | else |
| 801 | { |
| 802 | $ldel2 = $rdel2 = $ldel1; |
| 803 | } |
| 804 | $str2pos = $ld2pos+1; |
| 805 | |
| 806 | if ($ldel2 =~ /[[(<{]/) |
| 807 | { |
| 808 | pos($$textref)--; # OVERCOME BROKEN LOOKAHEAD |
| 809 | _match_bracketed($textref,"",$ldel2,"","",$rdel2) |
| 810 | || do { pos $$textref = $startpos; return }; |
| 811 | } |
| 812 | else |
| 813 | { |
| 9686a75b |
814 | $$textref =~ /[^\\$ldel2]*(\\.[^\\$ldel2]*)*$ldel2/gcs |
| 3270c621 |
815 | || do { pos $$textref = $startpos; return }; |
| 816 | } |
| 817 | $rd2pos = pos($$textref)-1; |
| 818 | } |
| 819 | else |
| 820 | { |
| 821 | $ld2pos = $str2pos = $rd2pos = $rd1pos; |
| 822 | } |
| 823 | |
| 824 | $modpos = pos $$textref; |
| 825 | |
| 826 | $$textref =~ m/\G($mods{$op})/gc; |
| 827 | my $endpos = pos $$textref; |
| 828 | |
| 829 | return ( |
| 830 | $startpos, $oppos-$startpos, # PREFIX |
| 831 | $oppos, length($op), # OPERATOR |
| 832 | $ld1pos, 1, # LEFT DEL |
| 833 | $str1pos, $rd1pos-$str1pos, # STR/PAT |
| 834 | $rd1pos, 1, # RIGHT DEL |
| 835 | $ld2pos, $second_arg, # 2ND LDEL (MAYBE) |
| 836 | $str2pos, $rd2pos-$str2pos, # 2ND STR (MAYBE) |
| 837 | $rd2pos, $second_arg, # 2ND RDEL (MAYBE) |
| 838 | $modpos, $endpos-$modpos, # MODIFIERS |
| 839 | $endpos, $textlen-$endpos, # REMAINDER |
| 840 | ); |
| 841 | } |
| 842 | |
| 843 | my $def_func = |
| 844 | [ |
| 845 | sub { extract_variable($_[0], '') }, |
| 846 | sub { extract_quotelike($_[0],'') }, |
| 847 | sub { extract_codeblock($_[0],'{}','') }, |
| 848 | ]; |
| 849 | |
| 850 | sub extract_multiple (;$$$$) # ($text, $functions_ref, $max_fields, $ignoreunknown) |
| 851 | { |
| 852 | my $textref = defined($_[0]) ? \$_[0] : \$_; |
| 853 | my $posbug = pos; |
| 854 | my ($lastpos, $firstpos); |
| 855 | my @fields = (); |
| 856 | |
| 857 | for ($$textref) |
| 858 | { |
| 859 | my @func = defined $_[1] ? @{$_[1]} : @{$def_func}; |
| 860 | my $max = defined $_[2] && $_[2]>0 ? $_[2] : 1_000_000_000; |
| 861 | my $igunk = $_[3]; |
| 862 | |
| 863 | pos ||= 0; |
| 864 | |
| 865 | unless (wantarray) |
| 866 | { |
| 867 | use Carp; |
| 868 | carp "extract_multiple reset maximal count to 1 in scalar context" |
| 869 | if $^W && defined($_[2]) && $max > 1; |
| 870 | $max = 1 |
| 871 | } |
| 872 | |
| 873 | my $unkpos; |
| 874 | my $func; |
| 875 | my $class; |
| 876 | |
| 877 | my @class; |
| 878 | foreach $func ( @func ) |
| 879 | { |
| 880 | if (ref($func) eq 'HASH') |
| 881 | { |
| 882 | push @class, (keys %$func)[0]; |
| 883 | $func = (values %$func)[0]; |
| 884 | } |
| 885 | else |
| 886 | { |
| 887 | push @class, undef; |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | FIELD: while (pos() < length()) |
| 892 | { |
| 893 | my $field; |
| 894 | foreach my $i ( 0..$#func ) |
| 895 | { |
| 896 | $func = $func[$i]; |
| 897 | $class = $class[$i]; |
| 898 | $lastpos = pos; |
| 899 | if (ref($func) eq 'CODE') |
| 900 | { ($field) = $func->($_) } |
| 901 | elsif (ref($func) eq 'Text::Balanced::Extractor') |
| 902 | { $field = $func->extract($_) } |
| 903 | elsif( m/\G$func/gc ) |
| 904 | { $field = defined($1) ? $1 : $& } |
| 905 | |
| 906 | if (defined($field) && length($field)) |
| 907 | { |
| 908 | if (defined($unkpos) && !$igunk) |
| 909 | { |
| 910 | push @fields, substr($_, $unkpos, $lastpos-$unkpos); |
| 911 | $firstpos = $unkpos unless defined $firstpos; |
| 912 | undef $unkpos; |
| 913 | last FIELD if @fields == $max; |
| 914 | } |
| 915 | push @fields, $class |
| 916 | ? bless(\$field, $class) |
| 917 | : $field; |
| 918 | $firstpos = $lastpos unless defined $firstpos; |
| 919 | $lastpos = pos; |
| 920 | last FIELD if @fields == $max; |
| 921 | next FIELD; |
| 922 | } |
| 923 | } |
| 924 | if (/\G(.)/gcs) |
| 925 | { |
| 926 | $unkpos = pos()-1 |
| 927 | unless $igunk || defined $unkpos; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | if (defined $unkpos) |
| 932 | { |
| 933 | push @fields, substr($_, $unkpos); |
| 934 | $firstpos = $unkpos unless defined $firstpos; |
| 935 | $lastpos = length; |
| 936 | } |
| 937 | last; |
| 938 | } |
| 939 | |
| 940 | pos $$textref = $lastpos; |
| 941 | return @fields if wantarray; |
| 942 | |
| 943 | $firstpos ||= 0; |
| 944 | eval { substr($$textref,$firstpos,$lastpos-$firstpos)=""; |
| 945 | pos $$textref = $firstpos }; |
| 946 | return $fields[0]; |
| 947 | } |
| 948 | |
| 949 | |
| 950 | sub gen_extract_tagged # ($opentag, $closetag, $pre, \%options) |
| 951 | { |
| 952 | my $ldel = $_[0]; |
| 953 | my $rdel = $_[1]; |
| 954 | my $pre = defined $_[2] ? $_[2] : '\s*'; |
| 955 | my %options = defined $_[3] ? %{$_[3]} : (); |
| 956 | my $omode = defined $options{fail} ? $options{fail} : ''; |
| 957 | my $bad = ref($options{reject}) eq 'ARRAY' ? join('|', @{$options{reject}}) |
| 958 | : defined($options{reject}) ? $options{reject} |
| 959 | : '' |
| 960 | ; |
| 961 | my $ignore = ref($options{ignore}) eq 'ARRAY' ? join('|', @{$options{ignore}}) |
| 962 | : defined($options{ignore}) ? $options{ignore} |
| 963 | : '' |
| 964 | ; |
| 965 | |
| 966 | if (!defined $ldel) { $ldel = '<\w+(?:' . gen_delimited_pat(q{'"}) . '|[^>])*>'; } |
| 967 | |
| 968 | my $posbug = pos; |
| 969 | for ($ldel, $pre, $bad, $ignore) { $_ = qr/$_/ if $_ } |
| 970 | pos = $posbug; |
| 971 | |
| 972 | my $closure = sub |
| 973 | { |
| 974 | my $textref = defined $_[0] ? \$_[0] : \$_; |
| 975 | my @match = Text::Balanced::_match_tagged($textref, $pre, $ldel, $rdel, $omode, $bad, $ignore); |
| 976 | |
| 977 | return _fail(wantarray, $textref) unless @match; |
| 978 | return _succeed wantarray, $textref, |
| 979 | $match[2], $match[3]+$match[5]+$match[7], # MATCH |
| 980 | @match[8..9,0..1,2..7]; # REM, PRE, BITS |
| 981 | }; |
| 982 | |
| 983 | bless $closure, 'Text::Balanced::Extractor'; |
| 984 | } |
| 985 | |
| 986 | package Text::Balanced::Extractor; |
| 987 | |
| 988 | sub extract($$) # ($self, $text) |
| 989 | { |
| 990 | &{$_[0]}($_[1]); |
| 991 | } |
| 992 | |
| 993 | package Text::Balanced::ErrorMsg; |
| 994 | |
| 995 | use overload '""' => sub { "$_[0]->{error}, detected at offset $_[0]->{pos}" }; |
| 996 | |
| 997 | 1; |
projects / p5sagit/p5-mst-13.2.git / blame