3435 lines
1008 KiB
Plaintext
3435 lines
1008 KiB
Plaintext
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rust
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À #rustc 1.96.0 (ac68faa20 2026-05-25)ÁíàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ À뉊 ]!ÜÛê(¹Þ—šên -5be7b69c3ff7b5b8Á ¤²XctÔ'ÐÓ©z¨É½Ó -a4945860e1c53b00Á ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ–�òÖÀH•‘P IÓHã#£ -055f30b747f859b6Á rustc_std_workspace_coreÁCçß^ò½èÝ$Çÿ+Cé -c4878ee60b2242c9Á ŸÃï+Ñ]ŠqB<ÏïW# -8dd1dd90e70d0b6aÁ miniz_oxideÁ€š»J(P>àö÷g\K -1eb618da2918ab7fÁ adler2ÁÆ;+Þ®5¥ÌýÝ°¦ÛLˆ -f7919172d268e069Á hashbrownÁPäV9ÒÆèÜ�"ÊÖVŽ\ -0fc2184a5da6723aÁ rustc_std_workspace_allocÁs&ØòØy¯s•bæ!‰ýŠ -97e4bf30be240674Á
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std_detectÁhŠBîÙºÌI®Ë�Å�š -9dbbf8346ba7ac8bÁ rustc_demangleÁûë9´Ç×@Œ�’ùXFº -f33013f239bf9f14Á cfg_ifÁÜLh�ž§Œaã¯>� -0a71c8f33a838301Á addr2lineÁ׎Þ!]8V$É@@T· -e618e6be60e87ba2Á gimliÁ¸
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°µ~Î1‹Ñt ðÁ€w -1f7768a68858f670Á objectÁ
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áPÃ?À¶¼QHJ¥� -914cd6a4dbe590d1Á memchrÁ›º«8Ór2Ù $¨ûib‚ -cf21ca6f2bb15dcdÁë
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‹ás «LÖ€îâƒ×ɯŒ -ee6f3747e38367f0Á testsÁ,ðÆ ‚ $åÆ ©Å,ºm‚ $¯m
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Å,´Í‚ $©Í¶Å,‰J‚ $þI¼Å,â´‚ $×´ÊÅ,§a‚ $œaìÅ,Õ‡‚ $ʇãÅ,ñ¤‚ $椊 Å,ôˆ‚ $éˆÒ ageÁ ( » unicode-ageÁ¼ Ò case_folding_simpleÁœW » unicode-caseÁÄ4 Ò general_categoryÁ„˜ » unicode-gencatÁÔs Ò grapheme_cluster_breakÁ´× » unicode-segmentÁܱ Ò perl_decimalÁdÓ » unicode-perlÁÄú Ò
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perl_spaceÁTà »è
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Äì Ò perl_wordÁLù »è
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ÄÖ Ò
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property_boolÁl® » unicode-boolÁÄ‹ Ò property_namesÁt� »— ¼Í »Ù Äê »ü Ôˆ »è
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Ĩ » unicode-scriptÁÔÆ »¶
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Üæ üǽ Ò property_valuesÁ|ñ »— ¼¯ »Ù ÄÌ »ü Ôê »è
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ÄŠ »¼ Ô¨ »¶
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ÜÈ ü©½ Ò scriptÁ4® »¼ Ô‰ Ò script_extensionÁ„â »¼ Ô½ Ò sentence_breakÁt¡ »¶
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Üû Ò
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word_breakÁTÞ »¶
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ܸ Ó Å,„t
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‚ $ùs
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Å,íy ‚ $ây í À ¤ astÁ
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parseÁ
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Í .¥ 0 spanÁ 0 into_astÁ 0 into_class_set_itemÁ 3¡ 3 30 into_class_literalÁ 7¡ 7 is_hexÁ is_capture_charÁ <> >æ > buildÁ >
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nest_limitÁ > octalÁ > ignore_whitespaceÁ > empty_min_rangeÁ Eæ Eí E parse_with_commentsÁ E resetÁ J 'sÁ J¡ Jæ J parserÁ J patternÁ J errorÁ Jž
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Jš J� J next_capture_indexÁ T J add_capture_nameÁ V J« Jÿ J char_atÁ Z J bumpÁ J bump_ifÁ J is_lookaround_prefixÁ J bump_and_bump_spaceÁ J
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bump_spaceÁ J peekÁ J
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peek_spaceÁ J is_eofÁ J posÁ Jã J span_charÁ J push_alternateÁ J push_or_add_alternationÁ h J
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push_groupÁ j J pop_groupÁ l J
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pop_group_endÁ J push_class_openÁ J pop_classÁ J unclosed_class_errorÁ J
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push_class_opÁ J pop_class_opÁ t• t¡ tí w të t parse_uncounted_repetitionÁ t parse_counted_repetitionÁ t parse_groupÁ t parse_capture_nameÁ t parse_flagsÁ t
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parse_flagÁ t parse_primitiveÁ t parse_escapeÁ � t !maybe_parse_special_word_boundaryÁ ƒ t parse_octalÁ t parse_hexÁ t parse_hex_digitsÁ t parse_hex_braceÁ t
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parse_decimalÁ t parse_set_classÁ t parse_set_class_rangeÁ t parse_set_class_itemÁ t parse_set_class_openÁ t maybe_parse_ascii_classÁ t parse_unicode_classÁ t parse_perl_classÁ ‘ 'pÁ ‘• ‘¡ ‘æ ‘ checkÁ ‘ increment_depthÁ — ‘ decrement_depthÁ šñ š• š¡ š° š š finishÁ š visit_preÁ š
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visit_postÁ š visit_class_set_item_preÁ š visit_class_set_item_postÁ š visit_class_set_binary_op_preÁ š visit_class_set_binary_op_postÁ specialize_errÁ §¥
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printÁ © ©©©©©©© ±> ©³æ ³‚ ©¶æ ¶× ¸¨ ©º¨ º° º ºþ ºŒ º� º visit_alternation_inÁ º¯ ºÏ à º visit_class_set_binary_op_inÁ ©Æ¨ Æ
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fmt_group_preÁ È Æ fmt_group_postÁ Æ fmt_repetitionÁ Ë Æ fmt_repetition_rangeÁ Í Æ fmt_literalÁ Ï Æ
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fmt_assertionÁ Ñ Æ
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fmt_set_flagsÁ Æ fmt_flagsÁ Ô ÔÔÆ fmt_class_bracketed_preÁ Æ fmt_class_bracketed_postÁ Æ fmt_class_set_binary_op_kindÁ Ú Æ fmt_class_perlÁ Ü Æ fmt_class_asciiÁ Þ Æ fmt_class_unicodeÁ à à
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visitorÁ ã ãããããã VisitorÁ ê° ê êþ ê¹ êŒ ê� êù ê visit_concat_inÁ ê¯ êÏ êð ê• êª ã visitÁ ø§ ã HeapVisitorÁ ú 'aÁ ú stackÁ ú stack_classÁ ã FrameÁ þÉ% þ
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RepetitionÁ €
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€ˆ þ GroupÁ ƒ
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ƒˆ þ ConcatÁ † headÁ † tailÁ þ AlternationÁ ‰Ï& ‰Û& ã
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ClassFrameÁ ŒÉ% Œô ŽÏ& ŽÛ& Œ BinaryÁ ‘ opÁ Œ BinaryLHSÁ “Ê' “” “ rhsÁ Œ BinaryRHSÁ —Ê' —õ' ã ClassInductÁ šÉ% š› œ
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œˆ š BinaryOpÁ Ÿ
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Ÿˆ ã ¢É% ¢æ ¢¡% ¥§ ¢ inductÁ §§ ¢ popÁ ¢ visit_classÁ ª§ ¢ visit_class_preÁ ¬§ ¢ visit_class_postÁ ®§ ¢ induct_classÁ ¢ó ã²É% ² childÁ ãµÉ% µ·* ã¸É% ¸ from_bracketedÁ ¸ from_setÁ ã¼É% ¼× ã¿É% ¿×
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‚ ¹ Âã  auxiliary_spanÁ Æ
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É×
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Ë× Ì
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Î×
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Ћ
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Òï
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Ô×
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Ö‹
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Øï
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Úæ Ú splatÁ Ú
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with_startÁ Ú with_endÁ Ú is_one_lineÁ Ú is_emptyÁ
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áæ
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ã emptyÁ ã flagsÁ ã« ã dotÁ ã assertionÁ ã
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class_unicodeÁ ã
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class_perlÁ ã class_bracketedÁ ã
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repetitionÁ ã groupÁ ã alternationÁ 㨠ãã ã¤- ã has_subexprsÁ
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ó× ô
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öî
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øî
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ú byteÁ
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ü digitsÁ
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þ from_nameÁ ÿ
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�
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is_negatedÁ
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ƒ is_equalÁ
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…C …ã …¤-
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‰ã
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‹ is_validÁ
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� pushÁ � into_itemÁ
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�Ø0
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’Ñ- ’ is_capturingÁ ’
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capture_indexÁ
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– add_itemÁ –
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flag_stateÁ
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™ is_negationÁ
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›ã œ œ œ
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ã ¡ ¡ ¡ ™ ¥ ByteÁ ¦
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¦ˆ ¥ ©× ª ¥ BytesÁ ¬
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¬É% ¬ˆ ¥°É% °× ¥ utf8_decodeÁ ³‘ eitherÁ Ç ¶ ¶¶¶¶¶¶¶¶¶ ¶ Á÷ ¶Ã÷ ¶¶Æ× ¶È 'eÁ È÷ ¶Ë¸4 Ë÷ ¶Î¸4 Ζ Î× ¶ SpansÁ Òñ Ò¹ Ò line_number_widthÁ Ò by_lineÁ Ò
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multi_lineÁ ¶Øñ Ø from_formatterÁ Ú¸4 Ú– Ø• Ø notateÁ Ø notate_lineÁ Ø left_pad_line_numberÁ Ø line_number_paddingÁ ¶ repeat_charÁ hirÁ ã ããããããããã ã
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ã ã ã
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ãããããããããã intervalÁ û ûûûûûûû ƒš û…š …� ûˆš ˆæ Š¥ ˆì0 ˆù ˆ intervalsÁ ˆ case_fold_simpleÁ ˆC ˆ intersectÁ ˆ
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differenceÁ ˆ symmetric_differenceÁ ˆ negateÁ ˆ canonicalizeÁ ˆ is_canonicalÁ û—É% —š —› —ó û IntervalÁ œ BoundÁ œ lowerÁ œ upperÁ œ set_lowerÁ œ set_upperÁ œ‰9 œ createÁ œC œ¨9 œ¹9 œ
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is_contiguousÁ œ is_intersection_emptyÁ œ is_subsetÁ ûÒ: ª min_valueÁ ª max_valueÁ ª as_u32Á ª incrementÁ ª decrementÁ û°“< °¤< °µ< °Ã< °Ô< û¶“< ¶¤< ¶µ< ¶Ã< ¶Ô< ã« ¼ ¼¼¼¼¼¼¼¼¼ ¼ Çæ Ç extractÁ É Ç‚ Ç limit_classÁ Ç limit_repeatÁ Ç limit_literal_lenÁ Ç limit_totalÁ Ç extract_concatÁ ÐÉ% К Ç extract_alternationÁ ÓÉ% Óš Ç extract_repetitionÁ Ç extract_class_unicodeÁ Ç extract_class_bytesÁ Ç class_over_limit_unicodeÁ Ç class_over_limit_bytesÁ Ç crossÁ Û ÇC Ý Ý Ç enforce_literal_lenÁ ¼á> ¼ã is_prefixÁ ã is_suffixÁ ¼æ> ¼èÄ- è infiniteÁ è singletonÁ èæ ìš ì“ ì è literalsÁ èì0 ñ è make_inexactÁ è
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make_infiniteÁ è
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cross_forwardÁ è
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cross_reverseÁ è cross_preambleÁ ÷É% èC è union_into_emptyÁ ú ú ú è dedupÁ þ è sortÁ è reverse_literalsÁ è minimize_by_preferenceÁ è keep_first_bytesÁ è keep_last_bytesÁ è is_finiteÁ è¤- è‘ ‡ è is_exactÁ ‰ Š è
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is_inexactÁ Œ � è
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max_union_lenÁ è
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max_cross_lenÁ è min_literal_lenÁ ‘ è max_literal_lenÁ “ è longest_common_prefixÁ • è longest_common_suffixÁ — è !optimize_for_prefix_by_preferenceÁ è !optimize_for_suffix_by_preferenceÁ è optimize_by_preferenceÁ › › › ATTEMPTSÁ ž › › › ¼£× ¼¥ù ¦¥ ¼¨ exactÁ ©“ ¨ inexactÁ «“ ¨ as_bytesÁ ¨
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into_bytesÁ ¨‘ ¨¤- ¨ƒE ¨»B ¨ reverseÁ ¨ extendÁ ¨®D ¨ÆD ¨ is_poisonousÁ ¼¸÷ ¼ º÷ » » ¼
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¾É ¼ À× ¼  minimizeÁ à  insertÁ Å Â rootÁ  create_stateÁ ¼ rankÁ ã× Ê ÊÊÊÊÊÊÊÊÊ Ê Õ> Ê×æ ׂ ÊÚæ Ú× Ü¨ ÊÞ¨ Þ° Þ Þþ ÞŒ ã Þ� Þù Êç¨ ç write_literal_charÁ ç write_literal_byteÁ ç write_literal_class_byteÁ ã translateÁ ì ììììììììì ì
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ì ì ì
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ìììììììììììÍ …¥ ì ‡> ì‰æ ‰‚ ‰ utf8Á ‰ line_terminatorÁ ‰ case_insensitiveÁ ‰Á5 ‰ dot_matches_new_lineÁ ‰ crlfÁ ‰
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swap_greedÁ ‰ unicodeÁ ì”æ ”„M ì— unwrap_exprÁ — unwrap_class_unicodeÁ — unwrap_class_bytesÁ — unwrap_repetitionÁ — unwrap_groupÁ — unwrap_alternation_pipeÁ ìž 'tÁ žñ ž° ž žþ žŒ ¤ ¤ ž� žù ž¯ žÏ žð žª ž• ì±þP ±ñ ±æ ± transÁ ±ì0 ± push_charÁ · ± push_byteÁ ±©) ± pop_concat_exprÁ ± pop_alt_exprÁ ±Ç ±Ñ- ± set_flagsÁ ± ast_literal_to_scalarÁ ± case_fold_charÁ Á Á Á ± hir_dotÁ ±
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hir_assertionÁ ± hir_captureÁ ± hir_repetitionÁ ± hir_unicode_classÁ É ± hir_ascii_unicode_classÁ Ë ± hir_ascii_byte_classÁ Í ± hir_perl_unicode_classÁ Ï ± hir_perl_byte_classÁ Ñ ± convert_unicode_class_errorÁ Ó ± unicode_fold_and_negateÁ Õ ± bytes_fold_and_negateÁ ± class_literal_byteÁ ìÙ from_astÁ Ù mergeÁ ÙáN ÙÁ5 Ù�O Ù©O Ù»O Ù�O ì hir_ascii_class_bytesÁ â ì ascii_classÁ ä ä ì ascii_class_as_charsÁ ç ç ãï# ê êêêêêêêœ$ ò° ò òþ ò¹ òŒ ò� òù òâ$ ê¡% û§ ê¶% ýÉ% ýÓ% êó% €É% €ˆ& ‚
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‚ˆ €` …
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…ˆ €Á& ˆÏ& ˆÛ& €ç& ‹Ï& ‹Û& ê ŽÉ% Žæ Ž¡% ‘§ Ž“) Ž©) ê•É% •·* ã ˜‚ ˜¹ ˜ã ãã�× ãŸ× 㢂 ¢ into_kindÁ ¢
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propertiesÁ ¢
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into_partsÁ ã§Ä- § failÁ §« ª“ § classÁ § lookÁ §À. ® § captureÁ §¨ §ß. ² ² §æ- 㶠subsÁ · ã¹× ã»× ã ½× ã
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¿‰9 ¿ try_case_fold_simpleÁ ¿ç9 ¿ is_utf8Á ¿ minimum_lenÁ ¿ maximum_lenÁ ¿¤- ¿« ã È× É ã Ëæ Ìš ËÄ- Ëì0 Ëù Ë rangesÁ ˉ9 ˶] Ëç9 ËC ˨9 ˹9 ËË9 Ë is_asciiÁ Ù Ëé] Ëü] Ë« Ý Ë
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to_byte_classÁ ß ã
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áÉ% á› áó ãå× ãçÒ: çß: çì: çù: çŠ; ç‰9 ãîæ î¹ îþ î‘ ãóæ ôš óÄ- óì0 óù óÞ^ ó‰9 óç9 óC ó¨9 ó¹9 óË9 ó£_ € óé] óü] ó« ó to_unicode_classÁ … ã‡É% ‡› ‡ó ã‹Ò: ‹ß: ‹ì: ‹ù: ‹Š; ‹‰9 ã’æ ’¹ ’þ ’‘ ã—× ã™ reversedÁ ™ as_reprÁ ™ from_reprÁ ™ as_charÁ ãž withÁ ã ã ¡ ã£é] £ü] £ look_setÁ £ look_set_prefixÁ £ look_set_prefix_anyÁ £ look_set_suffixÁ £ look_set_suffix_anyÁ £Ú] £ explicit_captures_lenÁ £ static_explicit_captures_lenÁ £
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is_literalÁ £ is_alternation_literalÁ £ memory_usageÁ £C ±š ±¡ ± ± ± ã·Ä- ·« ·•\ ·¢\ ·À. ¼ ¼ ¼ ·»\ À ·¨     ·ß. Ç ãÉÄ- É… ÉðA É‘ ɤ- É containsÁ É contains_anchorÁ É contains_anchor_haystackÁ É contains_anchor_lineÁ É contains_anchor_lfÁ É contains_anchor_crlfÁ É
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contains_wordÁ É contains_word_unicodeÁ É contains_word_asciiÁ Éù É«J É
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set_insertÁ É removeÁ É
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set_removeÁ É subtractÁ É set_subtractÁ ÉC É set_unionÁ ɨ9 É
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set_intersectÁ É read_reprÁ É
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write_reprÁ ã å× ã ç› çó ã class_charsÁ ã class_bytesÁ ã singleton_charsÁ ã singleton_bytesÁ ã lift_common_prefixÁ î ¬ ð ððððí ð öæ ö‚ öŽ öŸ ö¾N ö« öáN öÁ5 ö�O ö�O öÊN ö©O ö»O ð„ æ „ í ÞJ ‡ BYTE_FREQUENCIESÁ ˆ »O Š Š Š Š Š Š Š ¹ Š Š “ × Š Š – × Š ˜ æ ˜ mappingÁ ˜ overlapsÁ › › ˜ getÁ ž Š É% õ9 canonical_binaryÁ Š •\ ¤ Š ¦ impÁ Š ÿ
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¨ ºo Š
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perl_digitÁ ª ºo Š hir_classÁ ¬ Š is_word_characterÁ ® ºo Š PropertyValuesÁ Š canonical_gencatÁ Š canonical_scriptÁ Š canonical_propÁ ³ ºo Š canonical_valueÁ µ µ Š ç ¸ ºo Š property_setÁ º º Š agesÁ ½ ½ ºo ¿ ¿ Š gencatÁ Â ºo Š Ñ
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Ä ºo Š î
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Æ ºo Š
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bool_propertyÁ È ºo Š gcbÁ Ê ºo Š wbÁ Ì ºo Š sbÁ Î ºo Š symbolic_name_normalizeÁ Š symbolic_name_normalize_bytesÁ unicode_tablesÁ ¾N Ó Ó Ó Ó Ó Ó Ó Ó Ó MAX_UTF8_BYTESÁ Ó Ý from_encoded_rangeÁ Ý as_sliceÁ ß Ý ‘ Ý ’I Ý matchesÁ Ó ä É% ä IntoIterÁ ä › ä ê Ó é × ê Ó ì æ ì èt Ó ï × Ó ñ æ ñ … ñ ì0 Ó ScalarRangeÁ õ ¹ õ þ Ó ø × Ó ú › ú ó ü ü Ó Ó €
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splitÁ €
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Ø0 €
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as_asciiÁ €
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£_ €
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encodeÁ Ó max_scalar_valueÁ escapeÁ escape_intoÁ is_meta_characterÁ is_escapeable_characterÁ …p try_is_word_characterÁ is_word_byteÁ PrimitiveÁ Ž
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LiteralÁ �
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�
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ˆ Ž
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AssertionÁ ’
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’
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ˆ Ž
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DotÁ •
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•
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ˆ Ž
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PerlÁ ˜
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˜
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ˆ Ž
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UnicodeÁ ›
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›
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ˆ ž
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ƒ
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×
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¢
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Ö ¥
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�
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ParserBuilderÁ §
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« §
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Ž §
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Hóþ Ç ›Ç Ò Ù ,½(
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þ „ ' Ì… 3 ÊË > E $¦9
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š � ' š œ �› žˆ ã Ÿ Ñ( ¡ˆ ã ß8Þ–� û½ Š ‘ DÇ9
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š ' †ˆ 3 ûÁ > E ŒÐ- � ½ % »Ÿ 1 8 ? ,î‹ � � & ¬© 2 �� ž BoxÁ ¡ˆˆ ¢‰ˆ l }.xψ¥çEçEèE GlobalÁ ¿±‡§í# § ® ,«Œ � ’ & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏÚΑ‹ } „ <Š� � • & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏ“®‘‹ } „ È� � ˜ & ¬© 2 ÌŠ : A LƒŽ � › & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏ“Ä‘‹ } „ dèŽ � ž & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏฑ‹ } „ LÈ� � ¡ & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xϱ³‘‹ } „ t�‘ � ¤ & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏ‚¼‘‹ } „ Tƒ’ � § & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xϛǑ‹ } „ ,Ê’ � ª & ¬© 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏÊË‘‹ } „ \�“ �
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-ÜnLñê‘‹ y € \²ì Ž ¤ & Ûë 2 ½´ : A ”êù ¯ ° & �î 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xϪᑋ } „ < … ¹ » & éî 2 êï : A ,˜† ¹ ¾ & éî 2 Øò : A ü…ø Ò Ó ) Ò Ò Ó½Ê Õˆ ã ûXdöä f Æ Æ Çœ¹ ʈ û 'óÍ@Ķ �ñ £ ª ìã¿ ö ÷ ( ö ö ÷ÎÌ ùˆ ã wíZMœDb e Æ Æ Çœ¹ ʈ û 'óÍ@Ķ ‹ô ¢ © lî¸ ì ò & øú 2 8 ? lÀÀ ì ù & øú 2 9 @ ¬©Ò Š ‹ & ‚ý 2 �� žÚ‰ ¡ˆˆ ¢‰ˆ l }.xÏîý‘‹ } „ Äÿ Ø Ù % ƒ 1 8 ? ÜÔ Ý Þ % ðƒ 1 8 ? L˜? è ë ' è ê ëì› ìˆ í î¼' ïˆ ð ÖÝ ñåÝ òúÝ ÑLFÏ�`ÊG › ¡ ¨ 4°A è î ' ù¾ 3 < C 4še ö ø % †† 1 ·À 9 @ |áe ö û % †† 1 ·À 9 @ 4§f ö þ % †† 1 ·À 9 @ Ö
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¥µ¶ãð‡ Š Ò Ó ‡
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ˆ
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‰
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Š
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‹
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Œ
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�
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í À Ý= ¤,ð= ¦€,”> ¡ í,¨> õ Âz4¯> È öyl·> ¿
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�Ü„Ô> Ý ß4ý> úH ü û„ ü á: Ü:
|
|||
|
|
This crate provides a robust regular expression parser.
|
|||
|
|
|
|||
|
|
This crate defines two primary types:
|
|||
|
|
|
|||
|
|
* [`Ast`](ast::Ast) is the abstract syntax of a regular expression.
|
|||
|
|
An abstract syntax corresponds to a *structured representation* of the
|
|||
|
|
concrete syntax of a regular expression, where the concrete syntax is the
|
|||
|
|
pattern string itself (e.g., `foo(bar)+`). Given some abstract syntax, it
|
|||
|
|
can be converted back to the original concrete syntax (modulo some details,
|
|||
|
|
like whitespace). To a first approximation, the abstract syntax is complex
|
|||
|
|
and difficult to analyze.
|
|||
|
|
* [`Hir`](hir::Hir) is the high-level intermediate representation
|
|||
|
|
("HIR" or "high-level IR" for short) of regular expression. It corresponds to
|
|||
|
|
an intermediate state of a regular expression that sits between the abstract
|
|||
|
|
syntax and the low level compiled opcodes that are eventually responsible for
|
|||
|
|
executing a regular expression search. Given some high-level IR, it is not
|
|||
|
|
possible to produce the original concrete syntax (although it is possible to
|
|||
|
|
produce an equivalent concrete syntax, but it will likely scarcely resemble
|
|||
|
|
the original pattern). To a first approximation, the high-level IR is simple
|
|||
|
|
and easy to analyze.
|
|||
|
|
|
|||
|
|
These two types come with conversion routines:
|
|||
|
|
|
|||
|
|
* An [`ast::parse::Parser`] converts concrete syntax (a `&str`) to an
|
|||
|
|
[`Ast`](ast::Ast).
|
|||
|
|
* A [`hir::translate::Translator`] converts an [`Ast`](ast::Ast) to a
|
|||
|
|
[`Hir`](hir::Hir).
|
|||
|
|
|
|||
|
|
As a convenience, the above two conversion routines are combined into one via
|
|||
|
|
the top-level [`Parser`] type. This `Parser` will first convert your pattern to
|
|||
|
|
an `Ast` and then convert the `Ast` to an `Hir`. It's also exposed as top-level
|
|||
|
|
[`parse`] free function.
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Example
|
|||
|
|
|
|||
|
|
This example shows how to parse a pattern string into its HIR:
|
|||
|
|
|
|||
|
|
```
|
|||
|
|
use regex_syntax::{hir::Hir, parse};
|
|||
|
|
|
|||
|
|
let hir = parse("a|b")?;
|
|||
|
|
assert_eq!(hir, Hir::alternation(vec![
|
|||
|
|
Hir::literal("a".as_bytes()),
|
|||
|
|
Hir::literal("b".as_bytes()),
|
|||
|
|
]));
|
|||
|
|
# Ok::<(), Box<dyn std::error::Error>>(())
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Concrete syntax supported
|
|||
|
|
|
|||
|
|
The concrete syntax is documented as part of the public API of the
|
|||
|
|
[`regex` crate](https://docs.rs/regex/%2A/regex/#syntax).
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Input safety
|
|||
|
|
|
|||
|
|
A key feature of this library is that it is safe to use with end user facing
|
|||
|
|
input. This plays a significant role in the internal implementation. In
|
|||
|
|
particular:
|
|||
|
|
|
|||
|
|
1. Parsers provide a `nest_limit` option that permits callers to control how
|
|||
|
|
deeply nested a regular expression is allowed to be. This makes it possible
|
|||
|
|
to do case analysis over an `Ast` or an `Hir` using recursion without
|
|||
|
|
worrying about stack overflow.
|
|||
|
|
2. Since relying on a particular stack size is brittle, this crate goes to
|
|||
|
|
great lengths to ensure that all interactions with both the `Ast` and the
|
|||
|
|
`Hir` do not use recursion. Namely, they use constant stack space and heap
|
|||
|
|
space proportional to the size of the original pattern string (in bytes).
|
|||
|
|
This includes the type's corresponding destructors. (One exception to this
|
|||
|
|
is literal extraction, but this will eventually get fixed.)
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Error reporting
|
|||
|
|
|
|||
|
|
The `Display` implementations on all `Error` types exposed in this library
|
|||
|
|
provide nice human readable errors that are suitable for showing to end users
|
|||
|
|
in a monospace font.
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Literal extraction
|
|||
|
|
|
|||
|
|
This crate provides limited support for [literal extraction from `Hir`
|
|||
|
|
values](hir::literal). Be warned that literal extraction uses recursion, and
|
|||
|
|
therefore, stack size proportional to the size of the `Hir`.
|
|||
|
|
|
|||
|
|
The purpose of literal extraction is to speed up searches. That is, if you
|
|||
|
|
know a regular expression must match a prefix or suffix literal, then it is
|
|||
|
|
often quicker to search for instances of that literal, and then confirm or deny
|
|||
|
|
the match using the full regular expression engine. These optimizations are
|
|||
|
|
done automatically in the `regex` crate.
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Crate features
|
|||
|
|
|
|||
|
|
An important feature provided by this crate is its Unicode support. This
|
|||
|
|
includes things like case folding, boolean properties, general categories,
|
|||
|
|
scripts and Unicode-aware support for the Perl classes `\w`, `\s` and `\d`.
|
|||
|
|
However, a downside of this support is that it requires bundling several
|
|||
|
|
Unicode data tables that are substantial in size.
|
|||
|
|
|
|||
|
|
A fair number of use cases do not require full Unicode support. For this
|
|||
|
|
reason, this crate exposes a number of features to control which Unicode
|
|||
|
|
data is available.
|
|||
|
|
|
|||
|
|
If a regular expression attempts to use a Unicode feature that is not available
|
|||
|
|
because the corresponding crate feature was disabled, then translating that
|
|||
|
|
regular expression to an `Hir` will return an error. (It is still possible
|
|||
|
|
construct an `Ast` for such a regular expression, since Unicode data is not
|
|||
|
|
used until translation to an `Hir`.) Stated differently, enabling or disabling
|
|||
|
|
any of the features below can only add or subtract from the total set of valid
|
|||
|
|
regular expressions. Enabling or disabling a feature will never modify the
|
|||
|
|
match semantics of a regular expression.
|
|||
|
|
|
|||
|
|
The following features are available:
|
|||
|
|
|
|||
|
|
* **std** -
|
|||
|
|
Enables support for the standard library. This feature is enabled by default.
|
|||
|
|
When disabled, only `core` and `alloc` are used. Otherwise, enabling `std`
|
|||
|
|
generally just enables `std::error::Error` trait impls for the various error
|
|||
|
|
types.
|
|||
|
|
* **unicode** -
|
|||
|
|
Enables all Unicode features. This feature is enabled by default, and will
|
|||
|
|
always cover all Unicode features, even if more are added in the future.
|
|||
|
|
* **unicode-age** -
|
|||
|
|
Provide the data for the
|
|||
|
|
[Unicode `Age` property](https://www.unicode.org/reports/tr44/tr44-24.html#Character_Age).
|
|||
|
|
This makes it possible to use classes like `\p{Age:6.0}` to refer to all
|
|||
|
|
codepoints first introduced in Unicode 6.0
|
|||
|
|
* **unicode-bool** -
|
|||
|
|
Provide the data for numerous Unicode boolean properties. The full list
|
|||
|
|
is not included here, but contains properties like `Alphabetic`, `Emoji`,
|
|||
|
|
`Lowercase`, `Math`, `Uppercase` and `White_Space`.
|
|||
|
|
* **unicode-case** -
|
|||
|
|
Provide the data for case insensitive matching using
|
|||
|
|
[Unicode's "simple loose matches" specification](https://www.unicode.org/reports/tr18/#Simple_Loose_Matches).
|
|||
|
|
* **unicode-gencat** -
|
|||
|
|
Provide the data for
|
|||
|
|
[Unicode general categories](https://www.unicode.org/reports/tr44/tr44-24.html#General_Category_Values).
|
|||
|
|
This includes, but is not limited to, `Decimal_Number`, `Letter`,
|
|||
|
|
`Math_Symbol`, `Number` and `Punctuation`.
|
|||
|
|
* **unicode-perl** -
|
|||
|
|
Provide the data for supporting the Unicode-aware Perl character classes,
|
|||
|
|
corresponding to `\w`, `\s` and `\d`. This is also necessary for using
|
|||
|
|
Unicode-aware word boundary assertions. Note that if this feature is
|
|||
|
|
disabled, the `\s` and `\d` character classes are still available if the
|
|||
|
|
`unicode-bool` and `unicode-gencat` features are enabled, respectively.
|
|||
|
|
* **unicode-script** -
|
|||
|
|
Provide the data for
|
|||
|
|
[Unicode scripts and script extensions](https://www.unicode.org/reports/tr24/).
|
|||
|
|
This includes, but is not limited to, `Arabic`, `Cyrillic`, `Hebrew`,
|
|||
|
|
`Latin` and `Thai`.
|
|||
|
|
* **unicode-segment** -
|
|||
|
|
Provide the data necessary to provide the properties used to implement the
|
|||
|
|
[Unicode text segmentation algorithms](https://www.unicode.org/reports/tr29/).
|
|||
|
|
This enables using classes like `\p{gcb=Extend}`, `\p{wb=Katakana}` and
|
|||
|
|
`\p{sb=ATerm}`.
|
|||
|
|
* **arbitrary** -
|
|||
|
|
Enabling this feature introduces a public dependency on the
|
|||
|
|
[`arbitrary`](https://crates.io/crates/arbitrary)
|
|||
|
|
crate. Namely, it implements the `Arbitrary` trait from that crate for the
|
|||
|
|
[`Ast`](crate::ast::Ast) type. This feature is disabled by default.
|
|||
|
|
Á
|
|||
|
|
¥µ¶ãð‡ Š Ò Ó ‡
|
|||
|
|
ˆ
|
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|
|
‰
|
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|
|
Š
|
|||
|
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‹
|
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|
Œ
|
|||
|
|
�
|
|||
|
|
í4 À5 ¤4 ¦€3 ¡ í2 õ Âz1 È öy0 ¿
|
|||
|
|
�Ü/ Ý ß. úH È Ë Î „Ð= Å ”ã= º ,€> d�> ² ü€>% © ¬ ž ¡ “ – ÌË> ‹ ¬î> � \†? ü : 5
|
|||
|
|
Defines an abstract syntax for regular expressions.
|
|||
|
|
Á Ž? ©ã� è Ü Á˜ä÷à ¨ëÜŠ°
|
|||
|
|
Í
|
|||
|
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€”� € õ � » Ç Ó û “
|
|||
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£
|
|||
|
|
À
|
|||
|
|
ó
|
|||
|
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¤±ãðüœÊØ‹«¸ÄЮDK ¿ß
|
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Ú‰ i �
|
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|
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ß4v úH
|
|||
|
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Á ~ ÷<
|
|||
|
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Á
|
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ö ˆ ªB
|
|||
|
|
¡%, ø œ$<´ ê œ@�,ZTb„tnwgiDƒLœ—?A24l¿ ü 8 3
|
|||
|
|
This module provides a regular expression parser.
|
|||
|
|
Á ,Ç .:;§Ž
|
|||
|
|
Î
|
|||
|
|
§
|
|||
|
|
°
|
|||
|
|
Á
|
|||
|
|
Ú
|
|||
|
|
å
|
|||
|
|
Y4R a$e á. É<k Ë/ í y ë Ú‰ š � ß4¬ úH ! ToStringÁD´ —6 "Á Ã ÷< #Á #ö Ñ ªB $¿$ñ
|
|||
|
|
'îŒ ÷ � (çŠDü è )œŠ$† Ü *�µ4™ … +×w¼¥ Š
|
|||
|
|
,¿wŒ¾ ‰
|
|||
|
|
-$> tJ Kü>$ AD58),,† T“ $ü†# ÷ùDÌ Û,Þ „Þ Ò ë Åǵ·¥§t‘ ™ˆŠy{tÕ 4Ú ¥ / / Íì ¥ á Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
|
|||
|
|
⊾žY[ tƒ ã“1237 ¼Ã $Æ Á Áã“ Áˆ¥ 0 Ë 0
|
|||
|
|
1 $Ì Ä¯
|
|||
|
|
D²
|
|||
|
|
㓬© 0 0
|
|||
|
|
2 $»
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|||
|
|
üÕw œØ  Ãã“ Â Á
|
|||
|
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Á
|
|||
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‡| Ä
|
|||
|
|
¬ Å
|
|||
|
|
¹ ’,« ãP‘ à ¡ Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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|
û½¾ž 0 ¡ 4 4 ™ 0 Íìû� ì û�¤– tï
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|
3û�$ˆ » – /1 |Û Äû d‡ üÕq ”Ø Ä Åã“ Ä Á
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Á
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‡| Ä
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|
|
¬ Å
|
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|
¹ ’,« ãP‘ Åû� Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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|
“®¾ž 0 ¡ 8 8 ˜ 0 ÷Ž ë ˆ�tî
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7û�$‡ » • #% |Õ ÔÄ 4Ç
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: ® Î ü†0 |‰
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|
|
; ® ™ firstÁ,¢ ôà ¹•= ´ = ì… <ˆ ¹• < <
|
|||
|
|
= ”Ë ¹•?@ABCD ì¦ üä = : Create a new parser builder with a default configuration.Á ¹• > >
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? ì»! üô B ? Build a parser from this configuration with the given pattern.Á,Â! Æ Æ¹• ¤– > È! >
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@ $É! ü�2> üÛ&* ' Set the nesting limit for this parser.Á Š' ú ü’'K H The nesting limit controls how deep the abstract syntax tree is allowedÁ üâ'I F to be. If the AST exceeds the given limit (e.g., with too many nestedÁ ü°(5 2 groups), then an error is returned by the parser.Á ê( ú üò(G D The purpose of this limit is to act as a heuristic to prevent stackÁ ü¾)I F overflow for consumers that do structural induction on an `Ast` usingÁ üŒ*G D explicit recursion. While this crate never does this (instead usingÁ üØ*F C constant stack space and moving the call stack to the heap), otherÁ |£+ crates may.Á ·+ ú ü¿+H E This limit is not checked until the entire AST is parsed. Therefore,Á üŒ,I F if callers want to put a limit on the amount of heap space used, thenÁ üÚ,G D they should impose a limit on the length, in bytes, of the concreteÁ ü¦-C @ pattern string. In particular, this is viable since this parserÁ üî-F C implementation will limit itself to heap space proportional to theÁ ü¹.! length of the pattern string.Á ß. ú üç.I F Note that a nest limit of `0` will return a nest limit error for mostÁ üµ/J G patterns but not all. For example, a nest limit of `0` permits `a` butÁ ü„0J G not `ab`, since `ab` requires a concatenation, which results in a nestÁ üÓ0J G depth of `1`. In general, a nest limit is not something that manifestsÁ ü¢1I F in an obvious way in the concrete syntax, therefore, it should not beÁ Üð1 used in a granular way.ÁT—2 Ç Ç¹•È¢ > ¢2 >
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A $§2 limitÁ,2 üÆ98 üŠ3+ ( Whether to support octal syntax or not.Á º3 ú üÂ3H E Octal syntax is a little-known way of uttering Unicode codepoints inÁ ü�4@ = a regular expression. For example, `a`, `\x61`, `\u0061` andÁ üÔ4I F `\141` are all equivalent regular expressions, where the last exampleÁ ¼¢5 shows octal syntax.Á ¾5 ú üÆ5K H While supporting octal syntax isn't in and of itself a problem, it doesÁ ü–6J G make good error messages harder. That is, in PCRE based regex engines,Á üå6A > syntax like `\0` invokes a backreference, which is explicitlyÁ ü«7H E unsupported in Rust's regex engine. However, many users expect it toÁ üø7F C be supported. Therefore, when octal support is disabled, the errorÁ üÃ8I F message will explicitly mention that backreferences aren't supported.Á ‘9 ú ü™9( % Octal syntax is disabled by default.Á,Í9 È È¹• ¬ª > Ó9 >
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B $Ø9 ÿ Þ9 üì=D ü³:2 / Enable verbose mode in the regular expression.Á ê: ú üò:G D When enabled, verbose mode permits insignificant whitespace in manyÁ ü¾;G D places in the regular expression, as well as comments. Comments areÁ üŠ<= : started using `#` and continue until the end of the line.Á Ì< ú üÔ<F C By default, this is disabled. It may be selectively enabled in theÁ üŸ=H E regular expression by using the `x` flag regardless of this setting.ÁŒó= É É¹• æ® > …> >
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C $Š> ÿ �> ü±AB üñ>3 0 Allow using `{,n}` as an equivalent to `{0,n}`.Á ©? ú ü±?H E When enabled, the parser accepts `{,n}
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Á
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‡| Ä
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¬ Å
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¹ ’,« ãP‘ š˜ ˆ¥ ü�‚@ „�‚ × Ø ×Ü— ØãÍ Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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¾ž J ¡‚ J
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V •š˜$¢‚ capÁ ¨‚ ܃ V¸Â W РW í W W V W š˜ ãÍ ·À ü݆# Œà† Ù ÙÜ— J ò† J
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X •š˜$ó† ´Ôˆ $׈ Ú ÚÜ— J ܈ J
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Y •š˜$݈ ü¢Š# <¥Š Û ÛÜ— J Š J
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Z •š˜$®Š ´ ´Š ©‹ Z¸Â [ Р[ í [ [ Z [ š˜ ´ìŒ $ïŒ Ü ÜÜ— J ôŒ J
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\ •š˜$õŒ üÿ’' <‚“ Ý Þ ÝÜ— Þ J Š“ J
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] •š˜$‹“ prefixÁ4‘“ üú—& ¤ý— ß ßÜ— J ’˜ J
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^ •š˜$“˜ üÓš% œÖš à àÜ— J êš J
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_ •š˜$ëš ¤àŸ T㟠á áÜ— J îŸ J
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` •š˜$ïŸ ôž¨ $¡¨ â âÜ— ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ J ¦¨ J
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a •š˜$§¨ ü½ª$ TÀª ã ãÜ— òÎ J ˪ J
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b •š˜$̪ ÄØ° 4Û° ä äÜ— J â° J
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c •š˜$ã° Ì“² –² å åÜ— §¦ J š² J
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d •š˜$›² ´Ë³ $γ æ æÜ— ˆ¥ J Ó³ J
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e •š˜$Ô³ ÜÈ´ LË´ ç çÜ— ˆ¥ J Õ´ J
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f •š˜$Ö´ üλH tÑ» è èÜ— ¥Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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¥¾ž J à» J
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g •š˜$á» ¨4ë» üÚ¾6 ¼Ý¾ é éÜ— ¥ J õ¾ J
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h •š˜$ö¾ ¨4ü¾ „Ÿ¿ üÐÇD TÓÇ ê êÜ— ¥„Ô J ÞÇ J
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j •š˜$ßÇ ¨4éÇ ‚Í j¸Â k Рk í k k j k š˜ ÈÏ Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ üôÔI L÷Ô ë ëÜ— ¥„Ô J �Õ J
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l •š˜$‚Õ group_concatÁdŒÕ „ÌÕ üÈä? lËä ì ìÜ— ¥ó¶ J Ùä J
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n •š˜$Úä ¨4ää ü‹ôp |Žô í íÜ— ŒÁÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ŒÁ¾ž J §ô J
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o •š˜$¨ô parent_unionÁd¶ô üÑý‡ LÔý î îÜ— ŒÁÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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… ˆ ‰�µ Šˆ ‹ Œ›µ �ˆ ƺ·ƒˆ_ŸpŒÁ‚¼¾ž J çý J
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p •š˜$èý nested_unionÁdöý üªŽ, ¤Ž ï ïÜ— ¾ž J ÂŽ J
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q •š˜$ÃŽ ü�”’ l�” ð ðÜ— ûÂŒÁŒÁ J §” J
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r •š˜$¨” next_kindÁL¶”
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next_unionÁTä” ü€›; dƒ› ñ ñÜ— ú¼ú¼ J �› J
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s •š˜$‘› õ' —› üŽ * • u ¡ v u v ¬» — ½»tš Ü—wyz{|}~€�ƒ…†‡ˆ‰Š‹Œ�Ž�� “ VX ô‚¡ ,…¡ ò òÜ— ó¶ t ‹¡ t
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w •š˜$Œ¡ 4Ê¡ w¸Â x Рx í x x w x š˜ ϧ¬© üå¢: œè¢ ó óÜ— ¸¹ t ü¢ t
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y •š˜$ý¢ ü½·Ž ÔÀ· ô ôÜ— ¥‰É„Ô t ä· t
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z •š˜$å· ¨4÷· ‚$”¸ üÁÆi ÄÄÆ õ õÜ— ¥„Ô t æÆ t
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{ •š˜$çÆ ¨4ùÆ üÖçB \Ùç ö öÜ— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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… ˆ ‰�µ Šˆ ‹ Œ›µ �ˆ ƺ·ƒˆ_ŸpÚÎÊ˾ž t åç t
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| •š˜$æç üèýc ”ëý ÷ ÷Ü— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ã;ž t ‡þ t
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} •š˜$ˆþ µ1l–þ üˆ�+ \‹� ø øÜ— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ÈϾž t —� t
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~ •š˜$˜� ü¸œ) T»œ ù ùÜ— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ŸÒ¾ž t Æœ t
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•š˜$Çœ üÕ¤. |ؤ ú úÜ— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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㓾ž t è¤ t
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€ •š˜$é¤ ü˯+ dί û ûÜ— Ýì t Û¯ t
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� •š˜$ܯ LÁÁ �¸Â ‚ Р‚ í ‚ ‚ � ‚ š˜ ê°Ýì äÄü÷Ú| üúÚ! ü üÜ— §¦Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zـžž t ¥Û t
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ƒ •š˜$¦Û wb_startÁD´Û ¹Ü ƒ¸Â „ Р„ í „ „ ƒ „ š˜ ü¿î% \Âî ý ýÜ— “® t Îî t
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… •š˜$Ïî üëø+ Lîø þ þÜ— Ç� t øø t
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† •š˜$ùø ü��d „’� ÿ ÿÜ— °²Ç� t ¬� t
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‡ •š˜$� ‚$»� ü¤�c |§� € €Ü— °²Ç� t À� t
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ˆ •š˜$Á� ‚$Ï� üƒ�& l†� � �Ü— — t ”� t
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‰ •š˜$•� ü¨§8 |«§ ‚ ‚Ü— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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‹ •š˜$‰½ üüË3 ¤ÿË „ „Ü— Ýì t ”Ì t
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Ž •š˜$Öë ü¤ƒ: œ§ƒ ‡ ‡Ü— Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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฾ž t »ƒ t
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� •š˜$�š üÑ¡6 ñ ’ • “ ¡ ” “ ’ ” ÍìÑš Þ¡ Ñš¤– tá¡ �š•–—™ Ö¡ Ú¡ 8: üŽ¢7 ‘¢
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– ñ •Ñš$•£ ¿ ›£ üߣ8 |⣠Š ‹ Š�š ‹ˆ¥ ²Å ‘ ò£ ‘
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— ñ •Ñš$÷£ ã$ý£ Ѥ —¸Â ˜ Р˜ í ˜ ˜ — ˜ Ñš–Ä Á
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ñ •Ñš$Ū üõª0 Løª � Ž ��š Ž¬© ²Å š ‚« š
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¤ ñ •Ñš$¡» ¿ ¯» ü•Àm ì˜À • – •�š –ûÁ ²Å š ¿À š
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¦ ñ •Ñš$èÁ _astÁ$öÁ ü˜Äm t›Ä 슻Ÿ»ŸìŠ ¥ ¨ ¨ ÚŠ ªÄ
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§âŠ� 4²Ä ÷$ÉÄ toÁãÄ +- lÎ ü C >
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This module provides a regular expression printer for `Ast`.
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Á ,Ö ö
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ð
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© ¬ï#$ ã © ®œ$<… ê © ¯îŒ “ � © °LIfTYW `üY#M<u>@,.üò éš² ´ ² ô˜<› éš ± ±
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² œà éš´µ Ôú ý © éš ³ ³
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´ ÔÇ,Ê © ™ ™éš ´› ³ Ð ³
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µ $Ñd‚ ´›·¸ ¼³ Ì• Create a new printer.Á º ´› ¶ ¶
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· ü‘ H üþ H E Print the given `Ast` to the given writer. The writer must implementÁ üË
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J G `fmt::Write`. Typical implementations of `fmt::Write` that can be usedÁ üš E B here are a `fmt::Formatter` (which is available in `fmt::Display`Á üä ( % implementations) or a `&mut String`.Á,˜ š › š´› ›¬© ˜œÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ŸÈŸÈ Ȧ€ O˜éBL ¶ ¨ ¹ ¹ ¶ Í옜 ž êb˜œ T¡
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é› ì º × º
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јœ$ ?¿ ¦?ÌÙ?üôE?l÷E © ³ ´ ³é› ´ÚÎ ³– Æ …F Æ
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I A trait for visiting an abstract syntax tree (AST) in depth first order.Á ˆ
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ú üŒH
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E The principle aim of this trait is to enable callers to perform caseÁ üÕL
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I analysis on an abstract syntax tree without necessarily using recursion.Á ü¢O
|
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L In particular, this permits callers to do case analysis with constant stackÁ üòK
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H usage, which can be important since the size of an abstract syntax treeÁ ü¾*
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' may be proportional to end user input.Á é
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J Typical usage of this trait involves providing an implementation and
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= This method is called before beginning traversal of the AST.Á,°
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à ÃÞ· ê ¶
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E This method is called on an `Ast` before descending into child `Ast`Á T–
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nodes.ÁL¨
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|
|
ïÞ·$·
|
|||
|
|
éŒ$½
|
|||
|
|
üß =
|
|||
|
|
üþ G
|
|||
|
|
D This method is called on an `Ast` after descending all of its childÁ „Ê
|
|||
|
|
|
|||
|
|
`Ast` nodes.ÁTâ
|
|||
|
|
Æ Ç ÆÞ· Ǭ© ·¿ ê í
|
|||
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ê
|
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ðÞ·$ò
|
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éŒ$ø
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|
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üœ;
|
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ü¹
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|
|
3
|
|||
|
|
0 This method is called between child nodes of anÁ üñ
|
|||
|
|
&
|
|||
|
|
# [`Alternation`](ast::Alternation).Á¤Ÿ
|
|||
|
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È ÈÞ··¿ ê ´
|
|||
|
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ê
|
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|
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ñÞ·$¹
|
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|
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üº6
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üôA
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|
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> This method is called between child nodes of a concatenation.Á|½
|
|||
|
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É ÉÞ··¿ ê Í
|
|||
|
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ê
|
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|
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òÞ·$Ò
|
|||
|
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ü„p
|
|||
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ü�F
|
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|
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C This method is called on every [`ClassSetItem`](ast::ClassSetItem)Á üØ'
|
|||
|
|
$ before descending into child nodes.Áć
|
|||
|
|
Ê Ë ÊÞ· Ëû½ ·¿ ê ©
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ê
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ü‡q
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ü‘F
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”Ä üÜ&
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# after descending into child nodes.ÁÌŠ
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Ì Í ÌÞ· Íû½ ·¿ ê
|
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ê
|
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éŒ$À
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üœy
|
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ü•"
|
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|
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This method is called on everyÁ ü¼F
|
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|
|
C [`ClassSetBinaryOp`](ast::ClassSetBinaryOp) before descending intoÁ „‡
|
|||
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|
|
|||
|
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child nodes.ÁìŸ
|
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|
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Î Ï ÎÞ· ÏûÁ ·¿ ê Æ
|
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ê
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õÞ·$Ë
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ü¸z
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ü²"
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½Ç üÙK
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H [`ClassSetBinaryOp`](ast::ClassSetBinaryOp) after descending into childÁ T©
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ï½ô»
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|
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Ð Ñ ÐÞ· ÑûÁ ·¿ ê ã
|
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ê
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éŒ$ö
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üØx
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üÏJ
|
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|
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G This method is called between the left hand and right hand child nodesÁ üž5
|
|||
|
|
2 of a [`ClassSetBinaryOp`](ast::ClassSetBinaryOp).ÁäÛ
|
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|
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Ò Ó ÒÞ· ÓûÁ ·¿ ê �
|
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ê
|
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éŒ$”
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üº L
|
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üëD
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|
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A Executes an implementation of `Visitor` in constant stack space.Á °
|
|||
|
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ú ü´L
|
|||
|
|
I This function will visit every node in the given `Ast` while calling theÁ ü� :
|
|||
|
|
7 appropriate methods provided by the [`Visitor`] trait.Á ¼
|
|||
|
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ú üÀ J
|
|||
|
|
G The primary use case for this method is when one wants to perform caseÁ ü‹ O
|
|||
|
|
L analysis over an `Ast` without using a stack size proportional to the depthÁ üÛ O
|
|||
|
|
L of the `Ast`. Namely, this method will instead use constant stack size, butÁ ü« J
|
|||
|
|
G will use heap space proportional to the size of the `Ast`. This may beÁ üö J
|
|||
|
|
G desirable in cases where the size of `Ast` is proportional to end userÁ TÁ
|
|||
|
|
input.Á Ì
|
|||
|
|
ú üÐ N
|
|||
|
|
K If the visitor returns an error at any point, then visiting is stopped andÁ ÔŸ
|
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|
|
the error is returned.Á,Á
|
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Ô Ô¬© §Ö¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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Á É%$¯‹
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Tü ¾žÃÄÅÆ ü´ ü�" Return the type of this error.Á$» ì 쾞 컟  À Â
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à $ÁìŽ
|
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üõ= : The original pattern string in which this error occurred.Á · ú ü¿ J G Every span reported by this error is reported in terms of this string.Á<•
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|
1 . Return the span at which this error occurred.Á$Œ î    ‘ Â
|
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|
|
Å $’ ü¦- üÁ H E Return an auxiliary span. This span exists only for some errors thatÁ üŽ E B benefit from being able to point to two locations in the originalÁ üØ E B regular expression. For example, "duplicate" errors will have theÁ ü¢
|
|||
|
|
A > main error position set to the duplicate occurrence while itsÁ üè
|
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|
|
9 6 auxiliary span will be set to the initial occurrence.Át ï ﾞ ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡z٠  ¼ Â
|
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|
|
Æ $½|âüŒ? »À|ú>¼ô> ¾ž ü±?! ¾žÊ Åc Ê üÙ?D Ü? ð ñ ò 𾞠ñ c c ˆ ¢cµ
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` £cá« ` àB¤GS
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Ê $á?± ç?üÜ@% »ŸÌ Åc Ì üˆAD ‹A ó ô õ ó»Ÿ ô c c ˆ ¢cµ
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Ì $�A± –A|ÛAôŸg ˆ¥Ï Àc Ï üÄgD Çg ö ÷ ø öˆ¥ ÷ c c ˆ ¢cµ
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Ï $Ìg± ÒgŒÐh ˆ¥Ñ » Ñ üèh' ëh ù ú ùˆ¥ úˆ¥ ¿ßÀßÁß LessÁ Âß ÃßÄß~ Åß ÆßÇß GreaterÁ Èß åºÝÈnûê7 Ð ïh Ð
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Ñ $ðh¹
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Õ $Ôo± Úo¬¨q §¦× » × üÄq+ Çq € � €§¦ �§¦ ê‰ Ö Ëq Ö
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,ÛrLªs ˆ¥ÛÜÝÞßà üîs2 üºs/ , Create a new span with the given positions.Á õs §¦§¦ˆ¥ Ú Ú
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|
Û ¹,ùsþ Štü“u# üÊtD A Create a new span using the given position as the start and end.Á,šu §¦ˆ¥ Ú Ú
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|
Ü È uü½v. üàuI F Create a new span by replacing the starting the position with the oneÁ T®v given.ÁTÄv ˆ¥§¦ˆ¥ Ú Ú
|
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|
|
Ý $ÏvÈ Õvüøw, ü�wG D Create a new span by replacing the ending the position with the oneÁ TéwÐ’Dÿw ˆ¥§¦ˆ¥ Ú Ú
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Þ $ˆxÈ Žxü›y! üÔxB ? Returns true if and only if this span occurs on a single line.Á\¢y „ „ˆ¥ Ú ®y Ú
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|||
|
|
ß $¯yô‹{ üóyI F Returns true if and only if this span is empty. That is, it points toÁ üÁzE B a single position in the concrete syntax of a regular expression.ÁD’{ … …ˆ¥ Ú ›{ Ú
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|||
|
|
à $œ{lâ{ §¦â üÎ~A üö{5 2 Create a new position with the given information.Á °|ú ü¸|I F `offset` is the absolute offset of the position, starting at `0` fromÁ ü†}; 8 the beginning of the regular expression pattern string.Á Æ}ú üÎ}/ , `line` is the line number, starting at `1`.Á ‚~ú üŠ~? < `column` is the approximate column number, starting at `1`.Á Õ~ §¦ á á
|
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â ž
|
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4Ù~š$è~�4õ~Dû“ ¬©äåæçèéêëìíîïðñò ü®” üŠ” Create an "empty" AST item.Á,µ” ˆ¥¬© ã ã
|
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|
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ä ã$»”ü¡• ôþ” Create a "flags" AST item.Á,¨• Úά© ã ã
|
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å ° ®•ü”–! üï• Create a "literal" AST item.Á<›– “®¬© ã ã
|
|||
|
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æ ° £–솗 äå– Create a "dot" AST item.Á �— ˆ¥¬© ã ã
|
|||
|
|
ç ã$‘—üù—% üÒ—" Create a "assertion" AST item.ÁL€˜ “Ĭ© ã ã
|
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|
|
è ° Š˜üû˜, üИ& # Create a "Unicode class" AST item.Ál‚™ ฬ© ã ã
|
|||
|
|
é ° �™ü„š& üÜ™# Create a "Perl class" AST item.ÁT‹š ±³¬© ã ã
|
|||
|
|
ê ° –šü‰›0 üÜš( % Create a "bracketed class" AST item.Á|�› ‚¼¬© ã ã
|
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|
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ë ° ›ü˜œ' üð›# Create a "repetition" AST item.ÁTŸœ ›Ç¬© ã ã
|
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|
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ì ° ªœì•� ôòœ Create a "group" AST item.Á,œ� Êˬ© ã ã
|
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í ° ¢�ü‰ž) üà�$ ! Create a "alternation" AST item.Á\�ž ·¬¬© ã ã
|
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î ° œžüŠŸ üæž Create a "concat" AST item.Á4‘Ÿ ¥¬© ã ã
|
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ï ° ˜ŸÜŽ üØŸ1 . Return the span of this abstract syntax tree.Á$• † †¬© †ˆ¥ ã š ã
|
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ð $› ô©¥ üó¤1 . Return true if and only if this Ast is empty.ÁD°¥ ‡ ‡¬© ã ¹¥ ã
|
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ñ $º¥ô˜§d›§
|
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ˆ ˆ¬© ã ¨§ ã
|
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ò $©§ü¶ üåª/ , Print a display representation of this Ast.Á •«ú ü™«M J This does not preserve any of the original whitespace formatting that mayÁ üç«K H have originally been present in the concrete syntax from which this AstÁ ”³¬ was generated.Á Ƭú üʬM J This implementation uses constant stack space and heap space proportionalÁ ì˜ to the size of the `Ast`.Á ¬©ô Åc ô üÜD ß ‰ Š ‹ ‰¬© Š c c ˆ ¢cµ
|
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` £cá« ` àB¤GS
|
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|
|
‹³– ó ã ó
|
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|
|
ô $ä± êÔ¯®<®„¦± ·¬÷ üγ ü½±& # Return this alternation as an AST.Á è±ú üð±J G If this alternation contains zero ASTs, then `Ast::empty` is returned.Á ü¿²J G If this alternation contains exactly 1 AST, then the corresponding ASTÁ üŽ³; 8 is returned. Otherwise, `Ast::alternation` is returned.ÁDÕ³ ·¬¬© ö ö
|
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÷ $â³\η ¥ù üî¹ üà·( % Return this concatenation as an AST.Á �¸ú ü•¸Jʯ üä¸JŸ° ü³¹6 3 is returned. Otherwise, `Ast::concat` is returned.ÁDõ¹ ¥¬© ø ø
|
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ù $‚ºdÍ¿ “®û üòÀ üà¿G D If this literal was written as a `\x` hex escape, then this returnsÁ ü¬ÀA > the corresponding byte value. Otherwise, this returns `None`.Á$ùÀ Œ Œ“® ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ ú þÀ ú
|
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|
|
û $ÿÀœÈÖ °²ý ÜžØ üâÖF C The number of digits that must be used with this literal form whenÁ ü×? < used without brackets. When used with brackets, there is noÁ üñ×( % restriction on the number of digits.Á4¥Ø � �°² ü ¬Ø ü
|
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|
|
ý $Øœúæ £¶ÿ üáé6 ü”çG D Return the corresponding ClassAsciiKind variant for the given name.Á àçú üèçD A The name given should correspond to the lowercase version of theÁ ü±èH E variant name. e.g., `cntrl` is the name for `ClassAsciiKind::Cntrl`.Á þèú ü†éD A If no variant with the corresponding name exists, then `None` isÁ lÏé
|
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|
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returned.ÁLèé Ž Ž ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ£¶ þ øé þ
|
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|
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ÿ Ð $ò餦êŒÅõ ข ü÷ üÝõ0 - Returns true if this class has been negated.Á ’öú üšöF C Note that this takes the Unicode op into account, if it's present.Á üåöC @ e.g., `is_negated` for `\P{scx!=Katakana}` will return `false`.ÁT´÷ � �ภ� ¿÷ �
|
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‚ $À÷¼Ìª ‚»„ ô›« üêª, ) Whether the op is an equality op or not.ÁD¢« � �‚» ƒ «« ƒ
|
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„ $¬«lϵ ú¼†‡ˆ ü…¶, ìãµ Build a set from a union.Á,Œ¶ ŒÁú¼ … …
|
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† ¿ ’¶Ü¥· üð¶0 - Return the span of this character class set.Á$¬· ‘ ‘ú¼ ‘ˆ¥ … ±· …
|
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‡ $²·Ô‹¹DŽ¹
|
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|
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’ ’ú¼ … —¹ …
|
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ˆ $˜¹ŒÐ û½Š ܢà üèÂ5 2 Return the span of this character class set item.Á$©Ã “ “û½ “ˆ¥ ‰ ®Ã ‰
|
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|
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Š $¯Ã”ÝÉ •ÀŒ ô§Ë üöÉD A Returns true if and only if this character class range is valid.Á ¿Êú üÇÊJ G The only case where a range is invalid is if its start is greater thanÁ d–Ë its end.ÁD®Ë ” ”•À ‹ ·Ë ‹
|
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|
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Œ $¸Ë”õÎ ŒÁŽ� üŒÓ* üŽÏ" Push a new item in this union.Á µÏú ü½ÏE B The ending position of this union's span is updated to the endingÁ ü‡ÐG D position of the span of the item given. If the union is empty, thenÁ üÓÐG D the starting position of this union is set to the starting positionÁ ŒŸÑ of this item.Á µÑú ü½ÑG D In other words, if you only use this method to add items to a unionÁ ü‰ÒG D and you set the spans on each item correctly, then you should neverÁ üÕÒ2 / need to adjust the span of the union directly.Á$“Ó • •ŒÁû½ � ˜Ó �
|
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|
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Ž $�Ó÷$£Óü“×* üêÔ4 1 Return this union as a character class set item.Á £Õú ü«Õ= : If this union contains zero items, then an empty union isÁ üíÕE B returned. If this concatenation contains exactly 1 item, then theÁ ü·ÖE B corresponding item is returned. Otherwise, ClassSetItem::Union isÁ l�×÷»Lš× ŒÁû½ � �
|
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|
|
� $¨×¤Èô ¤Ê‘ ô¬ö üãô? < Returns true if and only if this repetition range is valid.Á §õú ü¯õI F The only case where a repetition range is invalid is if it is boundedÁ üýõ* ' and its start is greater than its end.ÁD³ö – –¤Ê � ¼ö �
|
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|
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‘ $½öT�ü ÊË“”• ü¤ý% ü üJ G If this group is non-capturing, then this returns the (possibly empty)Á üïü0 - set of flags. Otherwise, `None` is returned.Á,«ý — —ÊË Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ —ÈÏ ’ ±ý ’
|
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|
|
“ $²ýüŽÿ" üÑþ8 5 Returns true if and only if this group is capturing.Ád•ÿ ˜ ˜ÊË ’ ¢ÿ ’
|
|||
|
|
” $£ÿüˆ‚* üã€J G Returns the capture index of this group, if this is a capturing group.Á ²�ú üº�I F This returns a capture index precisely when `is_capturing` is `true`.Ál�‚ ™ ™ÊË Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ ’ �‚ ’
|
|||
|
|
• $ž‚Tˆ˜ ÈÏ—˜ üŽš< ü™˜1 . Add the given item to this sequence of flags.Á Ϙú üטG D If the item was added successfully, then `None` is returned. If theÁ ü£™@ = given item is a duplicate, then `Some(i)` is returned, whereÁ üè™! `items[i].kind == item.kind`.Á
|
|||
|
|
` £cá« ` àB¤GS
|
|||
|
|
¡³– © µ ©
|
|||
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|
ª $¶± ¼× ª ª ìã ,á É% ® ® ÈÔ gG>㋹Á� ¯ É%ªá ÈÔ <äN ÅîÈÔ ¬ ¬
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É%ç œë ¬ ¬ Åîü‚
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' É% ± ± ÈÔ² Àc ² ‡
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ü°
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@ ³
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¢ £ ¤ ¢ÈÔ £ c c ˆ ¢cµ
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` £cá« ` àB¤GS
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¤³– ° ·
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°
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² É%$¸
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± ¾
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üŠC\˜ ¥ ¥ªá ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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«
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³ ä»,¤üÔ! × ¥ §Ý
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´ Ë/$ÛTž? 4¢? …Lª? ,®? Ò⡱ formatÁ4 ¶ ¸ß4& úH ¶ ºô†D. —6 ¶ »Á = ÷< ¶ ¼Á ¶ ¼ö K ªB ¶ ½¿ `
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¶ ¿ø6 e ã ¶ À,Ÿ¡ü “•‚„rtDFR,XCE46ü¡ —Ö ë  üÇ!$Ê ¾ž—Ö Á Á
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 �¸ ÏüŽ —ÖÄ ë Ä ü´!$· ×—Ö Ã Ã
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Ä �¸ ¼ü— »À|…¼ÿ —Ö ü¼! —ÖÇ Åc Ç üäD ç ¦ § ¨ ¦—Ö § c c ˆ ¢cµ
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` £cá« ` àB¤GS
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¨³– Æ ë Æ
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Ç $ì± òü�? ¸4 É É øØÊ ë Ê ”üÕ$$Ø ÖÙøØ È È
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Ê ¸4�¸ Ýü®? ¸4 Ì Ì èÙÍ ë Í ³üô$$÷ ÏÛèÙ Ë Ë
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Í ¸4�¸ üü½G ¸4 Ï – Ð Ð Ï ÍìëØ Æ ÄcëØ ”É‘ØÑ Åc Ñ Â)+ ü‹D Ž © ª « ©‘Ø ª c c ˆ ¢cµ
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` £cá« ` àB¤GS
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«³– Î ’ Î
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Ñ ¸4ëØ$“± ™„¿" ,Æ"¶ ñ Ó Ó Ò Ò ü4 Ô¹ ¶ Õ™5 ¶ Ö²5 ¶ ×Á5 ¶ sÏsùxl“
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ñ sÏsùxl“
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ÔÕÖ×Ì"„�#<�#¶ Ò Ò ñ Ä¡%Œ¡%¶ Ò Ò äÝ'<Ý'¶ Ò Ò ªBªB ö Bá«÷< ®B‘÷< 9)
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-ÜnLªBªB ö Bá«÷< ®B‘÷< 9)
|
|||
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-ÜnLˆ¥‘‹‘‹ÔÀ)TÀ)¶ Ò Ò Âÿ”ß) ñ Ù Ù ¸ýÚÝÞßàá ä)ü¬*et¯* ¶ Û ñ ± ± ˆ ´¹ ¶ µ�¸ ¶ ¶ã ¶ ·”¸ ¶ g@„nòìÕ¥ ÛëØ ¸ý Ø– Ü Ü ¾* Ø “û Â* ¤û”Å*
|
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Ú ñëØ fmterÁ,â*57,. ü…2" ˆ2 ¶ ¬ ¬¸ýˆ¥ Ø Œ2 Ø
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Ý ñ$‘2ã$—2Ôë64î6 ¶ ¸ý Åš Ø õ6 Ø
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Þ ñ$ö6üá=1\ä= ¶ ® ®¸ý ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙÅš Ø ð= Ø
|
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ß ñ$ñ=´ ÷=ü�D2¤’D ¶ ¯ ¯¸ý Åš Ø §D Ø
|
|||
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à ñ$¨D¹ ®DüèG&œëG ¶ ° °¸ý Ø ÿG Ø
|
|||
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|
á ñ$€Hü“I/\–I ¶ Åš
|
|||
|
|
â ® ¢Iü,«I\µ? ü î é
|
|||
|
|
Defines a high-level intermediate (HIR) representation for regular expressions.
|
|||
|
|
|
|||
|
|
The HIR is represented by the [`Hir`] type, and it principally constructed via
|
|||
|
|
[translation](translate) from an [`Ast`](crate::ast::Ast). Alternatively, users
|
|||
|
|
may use the smart constructors defined on `Hir` to build their own by hand. The
|
|||
|
|
smart constructors simultaneously simplify and "optimize" the HIR, and are also
|
|||
|
|
the same routines used by translation.
|
|||
|
|
|
|||
|
|
Most regex engines only have an HIR like this, and usually construct it
|
|||
|
|
directly from the concrete syntax. This crate however first parses the
|
|||
|
|
concrete syntax into an `Ast`, and only then creates the HIR from the `Ast`,
|
|||
|
|
as mentioned above. It's done this way to facilitate better error reporting,
|
|||
|
|
and to have a structured representation of a regex that faithfully represents
|
|||
|
|
its concrete syntax. Namely, while an `Hir` value can be converted back to an
|
|||
|
|
equivalent regex pattern string, it is unlikely to look like the original due
|
|||
|
|
to its simplified structure.
|
|||
|
|
Á ½? û¼Êìêêëìíî„Žß쯰¹ÇÒÓÙëö÷ý�ÑÞ슋–¬¹ÿ$û 1 ã å‹ � ‹ ã æÚ‰ � ã èèò4© ã éß4¾ úH ã ëô†DÆ —6 ã ìÁ Õ ÷< ã íÁ ã íö ã ªB ã $‚ Ü ã ðÂ:Dœ œ ã òÁ¸\¦ ¼ ã óœ¹|³ Æ ã ô»O<É Š ã õ¡%,ú û øœ$<�
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ò ùîÛl˜
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Ø ú$ôbeSV,ŒT™K8;üŒ/.1 !DÞñ,ðLýåüð)×ÙÅdzµ¢¤,Þ ÌÞ ™›‹�´�
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€d«
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D¯
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㜪¼ÆÇÿ$ 1 û ý‹ ‹ û þp, ¿c û ÿp Âc û ÿž," ‰f û €ö ; ªB û �»O<L Š û ‚$ŠŒz|TnIK|/<tE-ü“' š „ „ Íì¨Ü ˜ œ¨Ü D›ìÛ üö. š † † Ä• û Õ•DþìÛ‡ ·ß ‡ ü«,® ± ² ±ìÛ ²ìÛ … ± …
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‡¨Ü$²¹
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,¸ü‰ š ‰ ‰ Ä• Ž Õ•D‘ìÛŠŒ�Ž��‘’“”•– 46 üªE ± ¥ìÛ ˆ¥ ‹ ‹ ˆ Í춘 µ ÇL¶˜ ´¸ ¶˜ÈL ¨ÜDÅ
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Š¨Ü¶˜ø8LÐ<> ü‘ '$˜ ³ ³ìÛ¨Ü ˆ � ˆ
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Œ¨Ü$¢ ö7D¬ ü�*,$—* ´ ´ìÛ Æ Æ Çœ¹ ʈ û 'óÍ@Ķ ´¨Ü ˆ œ* ˆ
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�¨Ü$�*üò+ Lù+ µ µìÛ µ
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¨Ü ˆ ƒ, ˆ
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Ž¨Ü$„,üš/H„¡/ ¶ ¶ìÛÖ¿Ù¿ Ú¿« Û¿ˆ Ü¿ Ý¿Þ¿ˆ ‚†f|Â
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ƒ ˆ ²/ ˆ
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�¨Ü$·/ü¹3/,À3 · ¸ ·ìÛ ¸ìÛ ˆ Æ3 ˆ
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�¨Ü$Ë3¹
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,Ñ3üÍ63LÔ6 ¹ º ¹ìÛ ºìÛ ˆ Þ6 ˆ
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‘¨Ü$ã6¹
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,é6üÅA4TÌA » ¼ »ìÛ ¼ìÛ ˆ ×A ˆ
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’¨Ü$ÜA¹
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,âAü½f>¤Äf ½ ¾ ½ìÛ ¾ìÛ ˆ Ùf ˆ
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“¨Ü$Þf¹
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,äfÄ�j4–j ¿ ¿ìÛ ˆ �j ˆ
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”¨Ü$¢jÔ±|d´| û À ÀìÛ ˆ Á| ˆ
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•¨Ü$Æ|ô€…dƒ… û Á ÁìÛ ˆ �… ˆ
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–¨Ü$‘…ü„ˆ/ É% ˜ š ™ ™ ˜ Íì”Ý �ˆÛÜš› úM ûM › ‰ˆ"$ Lºˆ$¿ˆ — — É%”Ý üÒˆ#$Õˆ  ÂÛÜۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙš¤ — Úˆ —
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› É%”Ý$߈ü—‰Z D¡‰ œ œ Ö·ü—‰³ ØÞ· ,¯‰ Š Þ· $·‰ ¿cÞ· ,¾‰ ³ Þ· <Ɖ ™Þ· Љ µßÞ·Þ· LÕ‰ íßÞ·Þ· TበºÞ· î‰ œ Ö· þ¥ �¦• ¦Š ±¦ ¦t Ó¦d é¦T ÿ¦I Ö·ã þ¥Ö �¦Ë ¦À ±¦µ ¦ª Ó¦š 馊 ÿ¦�žŸ ¡¢£¤¥¦§¨©�žŸ ¡¢£¤¥¦§¨© ÍìÞ· � ”ø‰ ªÉ¨ ,„Š Á¨ Ú¨ ¥ © ¡ ¨ ¤ § £ Ÿ ¦ ¢ ž Œø‰,ý‰ œ œ ü�Š ,“Š à ÃÞ· ɨ œ ™Š œ
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žÞ·$šŠü´Š ,·Š Ä ÄÞ· ɨ œ ½Š œ
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ŸÞ·$¾ŠüØŠ,LÛŠ Å Å޷ɨ œ åŠ œ
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Þ·$êŠ boundÁ,ðŠü‰‹,LŒ‹ Æ Æ޷ɨ œ –‹ œ
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¡Þ·$›‹êª,¡‹üº‹s„½‹ Ç È ÇÞ· ȪBªB ö Bá«÷< ®B‘÷< 9)
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-ÜnLÞ·‘‹Åœ œ ׋ œ
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¢Þ·$Ø‹ø8Læ‹üÒŒ94ÕŒ ɨɨ޷ œ œ
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£Þ·ß:,ÜŒì:,ðŒü•�-,˜� É Ê ÉÞ· ÊÞ· ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙÞ· œ ž� œ
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¤Þ·$Ÿ�¹
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,¥�üË“1LΓ Ë Ì ËÞ· ÌÞ· µ¯ œ Ø“ œ
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¥Þ·$Ù“¹
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,ß“ü³—BT¶— Í Î ÍÞ· ÎÞ· µ¯µ¯ œ Á— œ
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¦Þ·$—¹
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,È—üÇ -lÊ Ï Ð ÏÞ· ÐÞ· œ Ø œ
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§Þ·$Ù ¹
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,ß üì£5¬ï£ Ñ Ò ÑÞ· ÒÞ· œ …¤ œ
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¨Þ·$†¤¹
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,Œ¤ü¶¦)L¹¦ Ó Ô ÓÞ· ÔÞ· œ æ œ
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©Þ·$Ħ¹
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,ʦų̈M ,Ö¨ ª ª Ö·ų̈å �¦$ᨠþ¥,è¨ ¦,𨠦ø¨ Ó¦Lý¨ é¦T‰© ÿ¦ –© ª Ö·Z �¦U þ¥R ¦O ¦L Ó¦I é¦F ÿ¦C Ö·Š �¦… þ¥‚ ¦ ¦| Ó¦y é¦v ÿ¦s«¬®¯«¬®¯ ® ¬ ¯ « ¼ ©L£© Þ· ª ª
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«Þ·¼¼©L¿© Þ· ª ª
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¬Þ·¼Ø©4Û© Þ· ª ª
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Þ·$â©Üô©L÷© Þ·Þ· ª ª
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®Þ·$�ªÜ”ªL—ª Þ·Þ· ª ª
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¯Þ·$¡ªŒ³ª ±²³´µ « ¬ ® ¯ ² µ ± ³ ´ ´ËªLΪ ° °
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± ´þªL�« ° °
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² ´±«4´« ° °
|
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³ $»«Ôì«Lï« ° °
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´ $ù«Ô¸¬L»¬ ° °
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µ $Ŭœƒ ·¸¹º» « ¬ ® ¯ » ¹ · º ¸ ´�L ¶ ¶
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· ´ÏLÒ ¶ ¶
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¸ ´‡®4Š® ¶ ¶
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¹ $‘®ÔîLÆ® ¶ ¶
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º $ЮԀ°Lƒ° ¶ ¶
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» $�°|¹
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ü “ Ž
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Provides literal extraction from `Hir` expressions.
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An [`Extractor`] pulls literals out of [`Hir`] expressions and returns a
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[`Seq`] of [`Literal`]s.
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The purpose of literal extraction is generally to provide avenues for
|
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optimizing regex searches. The main idea is that substring searches can be an
|
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order of magnitude faster than a regex search. Therefore, if one can execute
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a substring search to find candidate match locations and only run the regex
|
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search at those locations, then it is possible for huge improvements in
|
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performance to be realized.
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With that said, literal optimizations are generally a black art because even
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though substring search is generally faster, if the number of candidates
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produced is high, then it can create a lot of overhead by ping-ponging between
|
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the substring search and the regex search.
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Here are some heuristics that might be used to help increase the chances of
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effective literal optimizations:
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* Stick to small [`Seq`]s. If you search for too many literals, it's likely
|
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to lead to substring search that is only a little faster than a regex search,
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and thus the overhead of using literal optimizations in the first place might
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make things slower overall.
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* The literals in your [`Seq`] shouldn't be too short. In general, longer is
|
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better. A sequence corresponding to single bytes that occur frequently in the
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haystack, for example, is probably a bad literal optimization because it's
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likely to produce many false positive candidates. Longer literals are less
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likely to match, and thus probably produce fewer false positives.
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* If it's possible to estimate the approximate frequency of each byte according
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to some pre-computed background distribution, it is possible to compute a score
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of how "good" a `Seq` is. If a `Seq` isn't good enough, you might consider
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skipping the literal optimization and just use the regex engine.
|
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(It should be noted that there are always pathological cases that can make
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any kind of literal optimization be a net slower result. This is why it
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might be a good idea to be conservative, or to even provide a means for
|
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literal optimizations to be dynamically disabled if they are determined to be
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ineffective according to some measure.)
|
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You're encouraged to explore the methods on [`Seq`], which permit shrinking
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the size of sequences in a preference-order preserving fashion.
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Finally, note that it isn't strictly necessary to use an [`Extractor`]. Namely,
|
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an `Extractor` only uses public APIs of the [`Seq`] and [`Literal`] types,
|
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so it is possible to implement your own extractor. For example, for n-grams
|
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or "inner" literals (i.e., not prefix or suffix literals). The `Extractor`
|
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is mostly responsible for the case analysis over `Hir` expressions. Much of
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the "trickier" parts are how to combine literal sequences, and that is all
|
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implemented on [`Seq`].
|
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Á <Á
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ÉÏÛäíû�‹ ‹ ¼ ¾í ¥ ë ¼ ¿ NonZeroUsizeÁd¯ ²– ¼ ÀÁ Ë ÷< ¼ ÂÁ ¼ Âö Õ ªB ¼ Ãø6$í ã ¼ Å–Æ ó „ ¼ Æ$™µ·¤¦Œª‹,Ã{}DÐ[TàL ç<>të2 ¿ÝÈÉËÌÍÎÏÐÓÖ×ØÙÚÛÝà ÌÁ4 ü€38 5 Create a new extractor with a default configuration.Á ½3ú üÅ3= : The extractor can be optionally configured before callingÁ ü‡45 2 [`Extractor::extract`] to get a literal sequence.Á È4 ¿Ý Ç Ç
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È üë6' üª6< 9 Execute the extractor and return a sequence of literals.Á<ò6 Õ Ö Õ¿Ý Öñê �ß Ç ú6 Ç
|
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É $û6ø6 �7œ¡7üæI; ü›AK H Set the kind of literal sequence to extract from an [`Hir`] expression.Á ëAú üóAD A The default is to extract prefixes, but suffixes can be selectedÁ ü¼BA > instead. The contract for prefixes is that every match of theÁ ü‚CK H corresponding `Hir` must start with one of the literals in the sequenceÁ üÒCK H returned. Moreover, the _order_ of the sequence returned corresponds toÁ Ì¢D the preference order.Á ÀDú üÈDB ? Suffixes satisfy a similar contract in that every match of theÁ ü�EI F corresponding `Hir` must end with one of the literals in the sequenceÁ üÝEE B returned. However, there is no guarantee that the literals are inÁ ¬§F preference order.Á ÁFú üÉFE B Remember that a sequence can be infinite. For example, unless theÁ ü“GJ G limits are configured to be impractically large, attempting to extractÁ üâGJ G prefixes (or suffixes) for the pattern `[A-Z]` will return an infiniteÁ ü±HG D sequence. Generally speaking, if the sequence returned is infinite,Á üýHK H then it is presumed to be unwise to do prefix (or suffix) optimizationsÁ ¤ÍI for the pattern.Á$íI × ×¿Ý»ÞÉå Ç òI Ç
|
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Ë $÷I‚$ýIüÖS= üÖJI F Configure a limit on the length of the sequence that is permitted forÁ ü¤KH E a character class. If a character class exceeds this limit, then theÁ üñK) & sequence returned for it is infinite.Á ŸLú ü§LH E This prevents classes like `[A-Z]` or `\pL` from getting turned intoÁ üôL7 4 huge and likely unproductive sequences of literals.Á °Mú l¸M
|
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# ExampleÁ ÊMú üÒMN K This example shows how this limit can be lowered to decrease the toleranceÁ ü¥N> ; for character classes being turned into literal sequences.Á èNú <ðN ```Á üüN> ; use regex_syntax::{hir::literal::{Extractor, Seq}, parse};Á ¿Oú üÇO let hir = parse(r"[0-9]")?;Á ëOú üóO- * let got = Extractor::new().extract(&hir);Á ì¥P let expected = Seq::new([Á üÇP9 6 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",Á <…Q ]);Á ô‘Q assert_eq!(expected, got);Á ´Qú ü¼QB ? // Now let's shrink the limit and see how that changes things.Á üƒR< 9 let got = Extractor::new().limit_class(4).extract(&hir);Á üÄR# let expected = Seq::infinite();Á ôìR®ì �Sú ü—S. + # Ok::<(), Box<dyn std::error::Error>>(())Á <ÊSåé\ÝS Ø Ø¿Ý “ð Ç éS Ç
|
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Ì $îSú¡,ôSüº^> üÐTJ G Configure a limit on the total number of repetitions that is permittedÁ üŸU) & before literal extraction is stopped.Á ÍUú üÕUB ? This is useful for limiting things like `(abcde){50}`, or moreÁ üœVG D insidiously, `(?:){1000000000}`. This limit prevents any one singleÁ üèV: 7 repetition from adding too much to a literal sequence.Á §Wú ü¯WK H With this limit set, repetitions that exceed it will be stopped and anyÁ üÿW= : literals extracted up to that point will be made inexact.Á ÁXú lÉX—è ÛXú üãXJ G This shows how to decrease the limit and compares it with the default.Á ²Yú <ºYåé üÆYG D use regex_syntax::{hir::literal::{Extractor, Literal, Seq}, parse};Á ’Zú üšZ" let hir = parse(r"(abc){8}")?;Á ÁZú üÉZ-ÿê üûZ: 7 let expected = Seq::new(["abcabcabcabcabcabcabcabc"]);Á ôº[®ì Ý[ú üå[Bâì ü¬\= : let got = Extractor::new().limit_repeat(4).extract(&hir);Á üî\# let expected = Seq::from_iter([Á ü–]) & Literal::inexact("abcabcabcabc"),Á <Ä]žì ôÐ]®ì ó]ú üû].ºî <®^åédÁ^ Ù Ù¿Ý —ú Ç Î^ Ç
|
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Í $Ó^ú¡,Ù^üþhC ü¶_I F Configure a limit on the maximum length of any literal in a sequence.Á „`ú üŒ`H E This is useful for limiting things like `(abcde){5}{5}{5}{5}`. WhileÁ üÙ`C @ each repetition or literal in that regex is small, when all theÁ ü¡aH E repetitions are applied, one ends up with a literal of length `5^4 =Á Lîa 625`.Á üaú ü„bI F With this limit set, literals that exceed it will be made inexact andÁ üÒb thus prevented from growing.Á ÷bú lÿb—è ‘cú ü™cJ ô ècú <ðcåé üücG�õ Èdú üÐd( % let hir = parse(r"(abc){2}{2}{2}")?;Á ýdú ü…e-ÿê ü·e:°ö ôöe®ì ™fú ü¡fBâì üèfC @ let got = Extractor::new().limit_literal_len(14).extract(&hir);Á ü°g#â÷ üØg+ ( Literal::inexact("abcabcabcabcab"),Á <ˆhžì ô”h®ì ·hú ü¿h.ºî <òhå錅i Ú Ú¿Ý š‚ Ç —i Ç
|
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Î $œiú¡,¢iü›{= ü„jB ? Configure a limit on the total number of literals that will beÁ lËj÷» Ýjú üåjF C This is useful as a practical measure for avoiding the creation ofÁ ü°kG D large sequences of literals. While the extractor will automaticallyÁ üükJ G handle local creations of large sequences (for example, `[A-Z]` yieldsÁ üËlD A an infinite sequence by default), large sequences can be createdÁ ü”m$ ! through non-local means as well.Á ½mú üÅmJ G For example, `[ab]{3}{3}` would yield a sequence of length `512 = 2^9`Á ü”nH E despite each of the repetitions being small on their own. This limitÁ üánK H thus represents a "catch all" for avoiding locally small sequences fromÁ ü±o# combining into large sequences.Á Ùoú láo—è óoú üûoE B
|
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|
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literals.Á ³öú ü»öI F The slice returned may be empty, in which case, there are no literalsÁ ü‰÷! that can match this sequence.ÁDÄ÷ ð ð�ß Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ ð
|
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|
|
üß è Í÷ è
|
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|
|
ð $Î÷ü®ü$ ü˜ø/ , Push a literal to the end of this sequence.Á Ìøú üÔø9 6 If this sequence is not finite, then this is a no-op.Á ’ùú üšùB ? Similarly, if the most recently added item of this sequence isÁ üáùH E equivalent to the literal given, then it is not added. This reflectsÁ ü®úH E a `Seq`'s "set like" behavior, and represents a practical trade off.Á üûúG D Namely, there is never any need to have two adjacent and equivalentÁ üÇûE B literals in the same sequence, _and_ it is easy to detect in someÁ T‘ü cases.Á$µü ñ ñ�ßüß è ºü è
|
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|
|
ñ $¿ü‚± Åü òý ñ ¸Â ò Рò í ò ò ñ ò üß Æ¾ ôÍÿ üÄþ6 3 Make all of the literals in this sequence inexact.Á ÿþú ü‡ÿ3 0 This is a no-op if this sequence is not finite.ÁdÔÿ ò ò�ß è áÿ è
|
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|
|
ó $æÿüË‚ üÀ�3 0 Converts this sequence to an infinite sequence.Á ø�ú ü€‚8 5 This is a no-op if the sequence is already infinite.ÁlÒ‚ ó ó�ß è à‚ è
|
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|
|
ô $å‚ü™¡0 ü–ƒH E Modify this sequence to contain the cross product between it and theÁ œãƒ sequence given.Á ûƒú üƒ„G D The cross product only considers literals in this sequence that areÁ üÏ„6 3 exact. That is, inexact literals are not extended.Á Š…ú ü’…H E The literals are always drained from `other`, even if none are used.Á üß…D A This permits callers to reuse the sequence allocation elsewhere.Á ¨†ú ü°†J G If this sequence is infinite, then this is a no-op, regardless of whatÁ üÿ†K H `other` contains (and in this case, the literals are still drained fromÁ üχK H `other`). If `other` is infinite and this sequence is finite, then thisÁ üŸˆG D is a no-op, unless this sequence contains a zero-length literal. InÁ üëˆK H which case, the infiniteness of `other` infects this sequence, and thisÁ ü»‰% " sequence is itself made infinite.Á å‰ú üí‰F C Like [`Seq::union`], this may attempt to deduplicate literals. SeeÁ ü¸ŠE B [`Seq::dedup`] for how deduplication deals with exact and inexactÁ l‚‹Šµ ”‹ú lœ‹—è ®‹ú ü¶‹E B This example shows basic usage and how exact and inexact literalsÁ l€Œ
|
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|
|
interact.Á ’Œú <šŒåé ü¦Œ3 0 use regex_syntax::hir::literal::{Literal, Seq};Á ÞŒú üæŒ# let mut seq1 = Seq::from_iter([Á ôŽ� Literal::exact("foo"),Á ü±� Literal::inexact("bar"),Á <Ö�žì üâ�# let mut seq2 = Seq::from_iter([Á üŠŽ! Literal::inexact("quux"),Á ô°Ž Literal::exact("baz"),Á <ÓŽžì üߎ" seq1.cross_forward(&mut seq2);Á †�ú üŽ�+ ( // The literals are pulled out of seq2.Á ü¾�$ ! assert_eq!(Some(0), seq2.len());Á ç�ú üï�#â÷ ü—�$ ! Literal::inexact("fooquux"),Á üÀ�! Literal::exact("foobaz"),Á üæ� ÝÌ <‹‘žì ü—‘ assert_eq!(expected, seq1);Á <»‘åé Ç‘ú üÏ‘B ? This example shows the behavior of when `other` is an infiniteÁ l–’
|
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|
|
sequence.Á ¨’ú <°’åé ü¼’3¼Ë ô’ú üü’#‡Ì ô¤“´Ì üÇ“ ÝÌ <ì“žì üø“# let mut seq2 = Seq::infinite();Á ü ”"¦Î Ç”ú üÏ”E B // When seq2 is infinite, cross product doesn't add anything, butÁ ü™•/ , // ensures all members of seq1 are inexact.Á üÍ•#â÷ üõ• Literal::inexact("foo"),Á üš– ÝÌ <¿–žì üË– ÙÐ <ï–åé û–ú üƒ—H E This example is like the one above, but shows what happens when thisÁ üЗH E sequence contains an empty string. In this case, an infinite `other`Á ü�˜G D sequence infects this sequence (because the empty string means thatÁ üé˜" there are no finite prefixes):Á �™ú <˜™åé ü¤™3¼Ë Ü™ú üä™#‡Ì ôŒš´Ì ü¯š= : Literal::exact(""), // inexact provokes same behaviorÁ üñš ÝÌ <–›žì ü¢›#óÒ üÊ›"¦Î ñ›ú äù› // seq1 is now infinite!Á üšœ assert!(!seq1.is_finite());Á <¾œåé Êœú üÒœA > This example shows the behavior of this sequence is infinite.Á ˜�ú < �åé ü¬�3¼Ë ä�ú üì�# let mut seq1 = Seq::infinite();Á ü”ž#–Í ô¼ž´Ì üßž ÝÌ <„Ÿžì ü�Ÿ"¦Î ·Ÿú ô¿Ÿ // seq1 remains unchanged.Á ü⟠÷Ù ü† K H // Even though the literals in seq2 weren't used, it was still drained.Á üÖ $–Ï <ÿ åél ¡ ô õ ô�ß õ�ß è ®¡ è
|
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|
õ $³¡¹
|
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,¹¡ü©È0 üǨD A Modify this sequence to contain the cross product between it andÁ ü�©C @ the sequence given, where the sequences are treated as suffixesÁ üØ©D A instead of prefixes. Namely, the sequence `other` is *prepended*Á ü¡ªB ? to `self` (as opposed to `other` being *appended* to `self` inÁ äèª [`Seq::cross_forward`]).Á ‰«ú ü‘«G®Â üÝ«6€Ã ˜¬ú ü ¬HÎà üí¬D¡Ä ¶ú ü¾JýÄ ü�®KÒÅ üÝ®K¨Æ ü¯GþÆ üù¯KÐÇ üÉ°%¦È ó°ú üû°FãÈ üƱE´É l�²Šµ ¢²ú lª²—è ¼²ú üIJEºÊ lŽ³‰Ë ³ú <¨³åé ü´³3¼Ë ì³ú üô³#‡Ì ôœ´´Ì ü¿´ ÝÌ <ä´žì üð´#–Í ü˜µ!ÄÍ ô¾µïÍ <ᵞì üíµ" seq1.cross_reverse(&mut seq2);Á ”¶ú üœ¶+àÎ ü̶$–Ï õ¶ú üý¶#â÷ ü¥·$ ! Literal::inexact("quuxfoo"),Á üη ÝÌ üó·! Literal::exact("bazfoo"),Á <™¸žì ü¥¸ ÙÐ <ɸåé Õ¸ú üݸBžÑ l¤¹êÑ ¶¹ú <¾¹åé üʹ3¼Ë ‚ºú üŠº#‡Ì ô²º´Ì üÕº ÝÌ <úºžì ü†»#óÒ ü®»"¥å Õ»ú üÝ»E½Ó ü§¼/�Ô üÛ¼#â÷ üƒ½ ÖÔ ü¨½ ÝÌ <ͽžì üÙ½ ÙÐ <ý½åé ‰¾ú ü‘¾HÈÕ üÞ¾H›Ö ü«¿GîÖ ü÷¿" there are no finite suffixes):Á žÀú <¦Àåé ü²À3¼Ë êÀú üòÀ#‡Ì ôšÁ´Ì ü½Á=ÁØ üÿÁ ÝÌ <¤Âžì ü°Â#óÒ üØÂ"¥å ÿÂú ä‡ÃÐÙ ü¨Ã ÷Ù <ÌÃåé ØÃú üàÃC @ This example shows the behavior when this sequence is infinite.Á ¨Äú <°Äåé ü¼Ä3¼Ë ôÄú üüÄ#¿Û ü¤Å#–Í ôÌÅ´Ì üïÅ ÝÌ <”Æžì ü Æ"¥å ÇÆú ôÏÆÂÜ üòÆ ÷Ù ü–ÇKúÜ üæÇ$–Ï <�Èåél°È ö ÷ ö�ß ÷�ß è ¾È è
|
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|
|
ö $Ãȹ
|
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,ÉÈüŠØ†t�Ø ¼ ø ø�ßñð ۼݼ޼© ß¼ à¼ÛἈ cSñŸ«‡zÙ øªBªB ö Bá«÷< ®B‘÷< 9)
|
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|
|
-ÜnLüß‘‹Èñ è œØ è
|
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|
|
÷ $±Ø¹
|
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|
,¿Ø "ü†î( üÃá. + Unions the `other` sequence into this one.Á öáú üþáF C The literals are always drained out of the given `other` sequence,Á üÉâJ G even if they are being unioned into an infinite sequence. This permitsÁ ü˜ã@ = the caller to reuse the `other` sequence in another context.Á Ýãú üåãD A Some literal deduping may be performed. If any deduping happens,Á ü®äD A any leftmost-first or "preference" order match semantics will beÁ t÷ä preserved.Á Šåú l’å—è ¤åú ü¬å# This example shows basic usage.Á Ôåú <Üååé üèå( % use regex_syntax::hir::literal::Seq;Á •æú ü�æ- * let mut seq1 = Seq::new(&["foo", "bar"]);Á üÏæ5 2 let mut seq2 = Seq::new(&["bar", "quux", "foo"]);Á Ô‰ç seq1.union(&mut seq2);Á ¨çú ü°ç+àÎ üàç$–Ï ‰èú ü‘èK H // Adjacent literals are deduped, but non-adjacent literals may not be.Á üáè? < assert_eq!(Seq::new(&["foo", "bar", "quux", "foo"]), seq1);Á <¥éåé ±éú ü¹éG D This example shows that literals are drained from `other` even whenÁ ü…ê! they aren't necessarily used.Á «êú <³êåé ü¿ê(Äö ìêú üôê#¿Û üœë0 - // Infinite sequences have no finite length.Á üÑë! assert_eq!(None, seq1.len());Á ÷ëú üÿë5¼÷ Ô¹ìû÷ Øìú üàì8 5 // seq1 is still infinite and seq2 has been drained.Á ü�í!’ü üÃí$–Ï <ìíåé,�î ø ù ø�ß ù�ß è “î è
|
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|
ù $˜î¹
|
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|
,žîü´‚3 ü£òC @ Unions the `other` sequence into this one by splice the `other`Á üëò> ; sequence at the position of the first zero-length literal.Á ®óú ü¶óK H This is useful for preserving preference order semantics when combiningÁ ü†ôF C two literal sequences. For example, in the regex `(a||f)+foo`, theÁ üÑô> ; correct preference order prefix sequence is `[a, foo, f]`.Á ”õú üœõFŸò üçõJðò ü¶öJ G the caller to reuse the `other` sequence in another context. Note thatÁ ü…÷I F the literals are drained even if no union is performed as well, i.e.,Á üÓ÷> ; when this sequence does not contain a zero-length literal.Á –øú üžøD�ô üçøDìô t°ùºõ Ãùú lËù—è Ýùú üåù#ûõ �úú <•úåé ü¡ú(Äö Îúú üÖú1 . let mut seq1 = Seq::new(&["a", "", "f", ""]);Á üŒû& # let mut seq2 = Seq::new(&["foo"]);Á ü·û% " seq1.union_into_empty(&mut seq2);Á áûú üéû+àÎ ü™ü$–Ï üÂüH E // 'foo' gets spliced into seq1 where the first empty string occurs.Á ü�ý3 0 assert_eq!(Seq::new(&["a", "foo", "f"]), seq1);Á <Çýåé Óýú üÛýG“ú ü§þ!åú Íþú <Õþåé üáþ(Äö Žÿú ü–ÿ-„÷ üÈÿ5¼÷ ü‚€%œ†
|
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¬€ú ü´€@ = // seq1 has no zero length literals, so no splicing happens.Á üù€0 - assert_eq!(Seq::new(&["foo", "bar"]), seq1);Á ü®�> ; // Even though no splicing happens, seq2 is still drained.Á üñ�$–Ï <š‚åé„»‚ ú û ú�ß û�ß è Ì‚ è
|
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|
ú $Ñ‚¹
|
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,ׂ4šƒ ú ¸Â û Рû í û û ú û Ññ ˆ>ˆ> DrainÁ Œ>
|
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tail_startÁ÷< �> tail_lenÁ÷< Ž>ù÷< �>Á÷< …üò) «§ üß‘‹ á„ ú ¸Â ü Рü í ü ü ú üþ ýŠ ú ¸Â ý Рý í ý ý ú ý üß ¼�’ üé‹> ; Deduplicate adjacent equivalent literals in this sequence.Á ¬Œú ü´ŒH E If adjacent literals are equivalent strings but one is exact and theÁ ü��C @ other inexact, the inexact literal is kept and the exact one isÁ dÉ� removed.Á Ú�ú üâ�- * Deduping an infinite sequence is a no-op.Á ”Žú lœŽ—è ®Žú ü¶ŽG D This example shows how literals that are duplicate byte strings butÁ ü‚�> ; are not equivalent with respect to exactness are resolved.Á Å�ú <Í�åé üÙ�3¼Ë ‘�ú ü™�" let mut seq = Seq::from_iter([Á ôÀ�´Ì üã� ÖÔ <ˆ‘žì „”‘
|
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seq.dedup();Á ©‘ú ü±‘? < assert_eq!(Seq::from_iter([Literal::inexact("foo")]), seq);Á <õ‘åé,–’ ü ü�ß è œ’ è
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þ $¡’d÷’ þ ¸Â ÿ Рÿ í ÿ ÿ þ ÿ üß üß ´„œ üÈ•6 3 Sorts this sequence of literals lexicographically.Á ƒ–ú ü‹–J G Note that if, before sorting, if a literal that is a prefix of anotherÁ üÚ–G D literal appears after it, then after sorting, the sequence will notÁ ü¦—E B represent the same preference order match semantics. For example,Á üð—D A sorting the sequence `[samwise, sam]` yields the sequence `[sam,Á ü¹˜I F samwise]`. Under preference order semantics, the latter sequence willÁ ü‡™: 7 never match `samwise` where as the first sequence can.Á Æ™ú lΙ—è à™ú üè™#ûõ �šú <˜šåé ü¤š(Äö Ñšú üÙš4 1 let mut seq = Seq::new(&["foo", "quux", "bar"]);Á |’› seq.sort();Á ¦›ú ü®›7 4 assert_eq!(Seq::new(&["bar", "foo", "quux"]), seq);Á <ê›åé$‹œ ý ý�ß è �œ è
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€ $•œü§ " üÿœ2 / Reverses all of the literals in this sequence.Á ¶�ú ü¾�2 / The order of the sequence itself is preserved.Á õ�ú lý�—è �žú ü—ž#ûõ ¿žú <Çžåé üÓž(Äö €Ÿú üˆŸ, ) let mut seq = Seq::new(&["oof", "rab"]);Á ܹŸ seq.reverse_literals();Á üÙŸ/ , assert_eq!(Seq::new(&["foo", "bar"]), seq);Á <� åé„® þ þ�ß è ¿ è
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� $Ä ü«³( üë¡H E Shrinks this seq to its minimal size while respecting the preferenceÁ Ô¸¢ order of its literals.Á ×¢ú üߢG D While this routine will remove duplicate literals from this seq, itÁ ü«£I F will also remove literals that can never match in a leftmost-first orÁ üù£I F "preference order" search. Similar to [`Seq::dedup`], if a literal isÁ üǤ7 4 deduped, then the one that remains is made inexact.Á ƒ¥ú ü‹¥9 6 This is a no-op on seqs that are empty or not finite.Á É¥ú lÑ¥—è ã¥ú üë¥B ? This example shows the difference between `{sam, samwise}` andÁ ¬²¦ `{samwise, sam}`.Á ̦ú <Ô¦åé üà¦3¼Ë ˜§ú ü §G D // If 'sam' comes before 'samwise' and a preference order search isÁ üì§0 - // executed, then 'samwise' can never match.Á ü¡¨0 - let mut seq = Seq::new(&["sam", "samwise"]);Á üÖ¨! seq.minimize_by_preference();Á üü¨? < assert_eq!(Seq::from_iter([Literal::inexact("sam")]), seq);Á À©ú üÈ©J G // But if they are reversed, then it's possible for 'samwise' to matchÁ ü—ª+ ( // since it is given higher preference.Á üǪ0 - let mut seq = Seq::new(&["samwise", "sam"]);Á üüª!è©
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ü¢«3 0 assert_eq!(Seq::new(&["samwise", "sam"]), seq);Á <Ú«åé æ«ú üî«C @ This example shows that if an empty string is in this seq, thenÁ ü¶¬1 . anything that comes after it can never match.Á ì¬ú <ô¬åé ü€3¼Ë ¸ú üÀF C // An empty string is a prefix of all strings, so it automaticallyÁ ü‹®5 2 // inhibits any subsequent strings from matching.Á üÅ®? < let mut seq = Seq::new(&["foo", "bar", "", "quux", "fox"]);Á ü‰¯!è©
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ü¯¯#â÷ ôׯ´Ì ôú¯ Literal::exact("bar"),Á ì�° Literal::inexact(""),Á <¿°žì ôË° assert_eq!(expected, seq);Á î°ú üö°K H // And of course, if it's at the beginning, then it makes it impossibleÁ üƱ" // for anything else to match.Á üí±8 5 let mut seq = Seq::new(&["", "foo", "quux", "fox"]);Á üª²!è©
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üв< 9 assert_eq!(Seq::from_iter([Literal::inexact("")]), seq);Á <‘³åé´²³ ÿ ÿ�ß è ɳ è
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‚ $γüع. üÒ´G D Trims all literals in this seq such that only the first `len` bytesÁ üžµG D remain. If a literal has less than or equal to `len` bytes, then itÁ üêµA > remains unchanged. Otherwise, it is trimmed and made inexact.Á °¶ú l¸¶—è ʶú <Ò¶åé üÞ¶3¼Ë –·ú üž·2 / let mut seq = Seq::new(&["a", "foo", "quux"]);Á äÕ· seq.keep_first_bytes(2);Á ö·ú üþ·#â÷ 䦸 Literal::exact("a"),Á üǸ Literal::inexact("fo"),Á üë¸ Literal::inexact("qu"),Á <�¹žì ô›¹½±
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<¾¹åé„ß¹ € €�ß è ð¹ è
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ƒ $õ¹‘ û¹ü´À- ü°»F C Trims all literals in this seq such that only the last `len` bytesÁ üû»Gǵ
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üǼA™¶
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�½ú l•½—è §½ú <¯½åé ü»½3¼Ë ó½ú üû½2··
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ܲ¾ seq.keep_last_bytes(2);Á Ò¾ú üÚ¾#â÷ ä‚¿µ¸
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ü£¿ Literal::inexact("oo"),Á üÇ¿ Literal::inexact("ux"),Á <ë¿žì ô÷¿½±
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<šÀåé|»À � ��ß è ËÀ è
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„ $ÐÀ‘ ÖÀüÅà üŠÂ, ) Returns true if this sequence is finite.Á »Âú üÃÂF C When false, this sequence is infinite and must be treated as if itÁ üŽÃ$ ! contains every possible literal.ÁLÌà ‚ ‚�ß è Öà è
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… $×Ãô‰Æ ü’ÄB ? Returns true if and only if this sequence is finite and empty.Á ÙÄú üáÄH E An empty sequence never matches anything. It can only be produced byÁ ü®ÅH E literal extraction when the corresponding regex itself cannot match.ÁD�Æ ƒ ƒ�ß è ™Æ è
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† $šÆüòÇ" üÓÆF C Returns the number of literals in this sequence if the sequence isÁ üžÇA > finite. If the sequence is infinite, then `None` is returned.Á ùÇ „ „�ß §Ý è ýÇ è
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‡ $þÇ4ºÈ ‡ ¸Â ˆ Рˆ í ˆ ˆ ‡ ˆ Ññ ôóÉ üØÈH E Returns true if and only if all literals in this sequence are exact.Á ¥Éú üÉ3 0 This returns false if the sequence is infinite.ÁDúÉ … …�ß è ƒÊ è
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‰ $„Ê4ºÊ ‰ ¸Â Š РŠ í Š Š ‰ Š ž¸ ÑÊ ‰ ¸Â ‹ Р‹ í ‹ ‹ ‰ ‹Ã¾ ü‹Ì üïÊJ G Returns true if and only if all literals in this sequence are inexact.Á ¾Ëú üÆË2 / This returns true if the sequence is infinite.ÁT’Ì † †�ß è �Ì è
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Œ $žÌ4ÓÌ Œ ¸Â � Р� í � � Œ �ÇÉ
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êÌ Œ ¸Â Ž РŽ í Ž Ž Œ ŽÃ¾ üÃÎ9 ü‰ÍD A Return the maximum length of the sequence that would result fromÁ üÒÍF C unioning `self` with `other`. If either set is infinite, then thisÁ œ�Î returns `None`.ÁlÊÎ ‡ ˆ ‡�ß ˆ�ß §Ý è ØÎ è
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� $Ùι
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,ßÎü¹Ñ9 üóÏH E Return the maximum length of the sequence that would result from theÁ üÀÐI F cross product of `self` with `other`. If either set is infinite, thenÁ ÄŽÑ this returns `None`.ÁlÀÑ ‰ Š ‰�ß Š�ß §Ý è ÎÑ è
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� $Ïѹ
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,ÕÑüŒÔ. üéÒ@ = Returns the length of the shortest literal in this sequence.Á ®Óú ü¶ÓC @ If the sequence is infinite or empty, then this returns `None`.Á|“Ô ‹ ‹�ß §Ý è £Ô è
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‘ $¤Ô èÔ ‘ ¸Â ’ Р’ í ’ ’ ‘ ’ ƾ ü¨Ö. ü†Õ? < Returns the length of the longest literal in this sequence.Á ÊÕú üÒÕC¾Ò
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|¯Ö Œ Œ�ß §Ý è ¿Ö è
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“ $ÀÖ „× “ ¸Â ” Р” í ” ” “ ”ªÕ
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üß4 ü¢×4 1 Returns the longest common prefix from this seq.Á Û×ú üã×F C If the seq matches any literal or other contains no literals, thenÁ ü®Ø: 7 there is no meaningful prefix and this returns `None`.Á íØú lõØ—è ‡Ùú ü�ÙA > This shows some example seqs and their longest common prefix.Á ÕÙú <ÝÙåé üéÙ(Äö –Úú üžÚ1 . let seq = Seq::new(&["foo", "foobar", "fo"]);Á üÔÚ> ; assert_eq!(Some(&b"fo"[..]), seq.longest_common_prefix());Á ü—Û( % let seq = Seq::new(&["foo", "foo"]);Á üÄÛ? < assert_eq!(Some(&b"foo"[..]), seq.longest_common_prefix());Á üˆÜ( % let seq = Seq::new(&["foo", "bar"]);Á üµÜ< 9 assert_eq!(Some(&b""[..]), seq.longest_common_prefix());Á ôöÜ let seq = Seq::new(&[""]);Á ü™Ý<¨Ü
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ÚÝú ôâÝ let seq = Seq::infinite();Á ü…Þ2 / assert_eq!(None, seq.longest_common_prefix());Á Ü¼Þ let seq = Seq::empty();Á üÜÞ2ÛÝ
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<“ßåé¬´ß � ��ß Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ �ªá è Êß è
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• $ËßL‹ä • ¸Â – Р– í – – • – Öá
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ü¼í4 ü±å4 1 Returns the longest common suffix from this seq.Á êåú üòåF²×
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ü½æ: 7 there is no meaningful suffix and this returns `None`.Á üæú l„ç—è –çú üžçA > This shows some example seqs and their longest common suffix.Á äçú <ìçåé üøç(Äö ¥èú üè1 . let seq = Seq::new(&["oof", "raboof", "of"]);Á üãè> ; assert_eq!(Some(&b"of"[..]), seq.longest_common_suffix());Á ü¦é(øÚ
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üÓé? < assert_eq!(Some(&b"foo"[..]), seq.longest_common_suffix());Á ü—ê(õÛ
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üÄê< 9 assert_eq!(Some(&b""[..]), seq.longest_common_suffix());Á ô…ëîÜ
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ü¨ë<°å
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éëú ôñë²Ý
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ü”ì2 / assert_eq!(None, seq.longest_common_suffix());Á ÜËì—Þ
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üëì2¯æ
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<¢íåé¬Ãí Ž Ž�ß Û¼Ý¼Þ¼© ß¼ à¼ÛἈ cSñŸ«‡zÙ Žªá è Ùí è
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— $ÚíLÄò — ¸Â ˜ Р˜ í ˜ ˜ — ˜Çá
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üʘ3 ü÷óB ? Optimizes this seq while treating its literals as prefixes andÁ ü¾ô4 1 respecting the preference order of its literals.Á ÷ôú üÿôJ G The specific way "optimization" works is meant to be an implementationÁ üÎõF C detail, as it essentially represents a set of heuristics. The goalÁ ü™öI F that optimization tries to accomplish is to make the literals in thisÁ üçöF C set reflect inputs that will result in a more effective prefilter.Á ü²÷J G Principally by reducing the false positive rate of candidates found byÁ ü�øH E the literals in this sequence. That is, when a match of a literal isÁ üÎøI F found, we would like it to be a strong predictor of the overall matchÁ üœùH E of the regex. If it isn't, then much time will be spent starting andÁ üéùJ G stopping the prefilter search and attempting to confirm the match onlyÁ ¤¸ú to have it fail.Á Ñúú üÙú& # Some of those heuristics might be:Á „ûú üŒûI F * Identifying a common prefix from a larger sequence of literals, andÁ üÚû= : shrinking the sequence down to that single common prefix.Á üœüI F * Rejecting the sequence entirely if it is believed to result in veryÁ üêüE B high false positive rate. When this happens, the sequence is madeÁ l´ý
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