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Java Source Code for Xerces Java 2.11.2
Where Can I see Java Source Code files for Xerces Java 2.11.2?
✍: FYIcenter
Here are Java Source Code files for Xerces Java 2.11.2:
⏎ org/apache/xerces/impl/xpath/regex/RegularExpression.java
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.xerces.impl.xpath.regex; import java.text.CharacterIterator; import java.util.Locale; import java.util.Stack; import org.apache.xerces.util.IntStack; /** * A regular expression matching engine using Non-deterministic Finite Automaton (NFA). * This engine does not conform to the POSIX regular expression. * * <hr width="50%"> * <h3>How to use</h3> * * <dl> * <dt>A. Standard way * <dd> * <pre> * RegularExpression re = new RegularExpression(<var>regex</var>); * if (re.matches(text)) { ... } * </pre> * * <dt>B. Capturing groups * <dd> * <pre> * RegularExpression re = new RegularExpression(<var>regex</var>); * Match match = new Match(); * if (re.matches(text, match)) { * ... // You can refer captured texts with methods of the <code>Match</code> class. * } * </pre> * * </dl> * * <h4>Case-insensitive matching</h4> * <pre> * RegularExpression re = new RegularExpression(<var>regex</var>, "i"); * if (re.matches(text) >= 0) { ...} * </pre> * * <h4>Options</h4> * <p>You can specify options to <a href="#RegularExpression(java.lang.String, java.lang.String)"><code>RegularExpression(</code><var>regex</var><code>, </code><var>options</var><code>)</code></a> * or <a href="#setPattern(java.lang.String, java.lang.String)"><code>setPattern(</code><var>regex</var><code>, </code><var>options</var><code>)</code></a>. * This <var>options</var> parameter consists of the following characters. * </p> * <dl> * <dt><a name="I_OPTION"><code>"i"</code></a> * <dd>This option indicates case-insensitive matching. * <dt><a name="M_OPTION"><code>"m"</code></a> * <dd class="REGEX"><kbd>^</kbd> and <kbd>$</kbd> consider the EOL characters within the text. * <dt><a name="S_OPTION"><code>"s"</code></a> * <dd class="REGEX"><kbd>.</kbd> matches any one character. * <dt><a name="U_OPTION"><code>"u"</code></a> * <dd class="REGEX">Redefines <Kbd>\d \D \w \W \s \S \b \B \< \></kbd> as becoming to Unicode. * <dt><a name="W_OPTION"><code>"w"</code></a> * <dd class="REGEX">By this option, <kbd>\b \B \< \></kbd> are processed with the method of * 'Unicode Regular Expression Guidelines' Revision 4. * When "w" and "u" are specified at the same time, * <kbd>\b \B \< \></kbd> are processed for the "w" option. * <dt><a name="COMMA_OPTION"><code>","</code></a> * <dd>The parser treats a comma in a character class as a range separator. * <kbd class="REGEX">[a,b]</kbd> matches <kbd>a</kbd> or <kbd>,</kbd> or <kbd>b</kbd> without this option. * <kbd class="REGEX">[a,b]</kbd> matches <kbd>a</kbd> or <kbd>b</kbd> with this option. * * <dt><a name="X_OPTION"><code>"X"</code></a> * <dd class="REGEX"> * By this option, the engine confoms to <a href="http://www.w3.org/TR/2000/WD-xmlschema-2-20000407/#regexs">XML Schema: Regular Expression</a>. * The <code>match()</code> method does not do subsring matching * but entire string matching. * * </dl> * * <hr width="50%"> * <h3>Syntax</h3> * <table border="1" bgcolor="#ddeeff"> * <tr> * <td> * <h4>Differences from the Perl 5 regular expression</h4> * <ul> * <li>There is 6-digit hexadecimal character representation (<kbd>\u005cv</kbd><var>HHHHHH</var>.) * <li>Supports subtraction, union, and intersection operations for character classes. * <li>Not supported: <kbd>\</kbd><var>ooo</var> (Octal character representations), * <Kbd>\G</kbd>, <kbd>\C</kbd>, <kbd>\l</kbd><var>c</var>, * <kbd>\u005c u</kbd><var>c</var>, <kbd>\L</kbd>, <kbd>\U</kbd>, * <kbd>\E</kbd>, <kbd>\Q</kbd>, <kbd>\N{</kbd><var>name</var><kbd>}</kbd>, * <Kbd>(?{<kbd><var>code</var><kbd>})</kbd>, <Kbd>(??{<kbd><var>code</var><kbd>})</kbd> * </ul> * </td> * </tr> * </table> * * <P>Meta characters are `<KBD>. * + ? { [ ( ) | \ ^ $</KBD>'.</P> * <ul> * <li>Character * <dl> * <dt class="REGEX"><kbd>.</kbd> (A period) * <dd>Matches any one character except the following characters. * <dd>LINE FEED (U+000A), CARRIAGE RETURN (U+000D), * PARAGRAPH SEPARATOR (U+2029), LINE SEPARATOR (U+2028) * <dd>This expression matches one code point in Unicode. It can match a pair of surrogates. * <dd>When <a href="#S_OPTION">the "s" option</a> is specified, * it matches any character including the above four characters. * * <dt class="REGEX"><Kbd>\e \f \n \r \t</kbd> * <dd>Matches ESCAPE (U+001B), FORM FEED (U+000C), LINE FEED (U+000A), * CARRIAGE RETURN (U+000D), HORIZONTAL TABULATION (U+0009) * * <dt class="REGEX"><kbd>\c</kbd><var>C</var> * <dd>Matches a control character. * The <var>C</var> must be one of '<kbd>@</kbd>', '<kbd>A</kbd>'-'<kbd>Z</kbd>', * '<kbd>[</kbd>', '<kbd>\u005c</kbd>', '<kbd>]</kbd>', '<kbd>^</kbd>', '<kbd>_</kbd>'. * It matches a control character of which the character code is less than * the character code of the <var>C</var> by 0x0040. * <dd class="REGEX">For example, a <kbd>\cJ</kbd> matches a LINE FEED (U+000A), * and a <kbd>\c[</kbd> matches an ESCAPE (U+001B). * * <dt class="REGEX">a non-meta character * <dd>Matches the character. * * <dt class="REGEX"><KBD>\</KBD> + a meta character * <dd>Matches the meta character. * * <dt class="REGEX"><kbd>\u005cx</kbd><var>HH</var> <kbd>\u005cx{</kbd><var>HHHH</var><kbd>}</kbd> * <dd>Matches a character of which code point is <var>HH</var> (Hexadecimal) in Unicode. * You can write just 2 digits for <kbd>\u005cx</kbd><var>HH</var>, and * variable length digits for <kbd>\u005cx{</kbd><var>HHHH</var><kbd>}</kbd>. * * <!-- * <dt class="REGEX"><kbd>\u005c u</kbd><var>HHHH</var> * <dd>Matches a character of which code point is <var>HHHH</var> (Hexadecimal) in Unicode. * --> * * <dt class="REGEX"><kbd>\u005cv</kbd><var>HHHHHH</var> * <dd>Matches a character of which code point is <var>HHHHHH</var> (Hexadecimal) in Unicode. * * <dt class="REGEX"><kbd>\g</kbd> * <dd>Matches a grapheme. * <dd class="REGEX">It is equivalent to <kbd>(?[\p{ASSIGNED}]-[\p{M}\p{C}])?(?:\p{M}|[\x{094D}\x{09CD}\x{0A4D}\x{0ACD}\x{0B3D}\x{0BCD}\x{0C4D}\x{0CCD}\x{0D4D}\x{0E3A}\x{0F84}]\p{L}|[\x{1160}-\x{11A7}]|[\x{11A8}-\x{11FF}]|[\x{FF9E}\x{FF9F}])*</kbd> * * <dt class="REGEX"><kbd>\X</kbd> * <dd class="REGEX">Matches a combining character sequence. * It is equivalent to <kbd>(?:\PM\pM*)</kbd> * </dl> * </li> * * <li>Character class * <dl> + * <dt class="REGEX"><kbd>[</kbd><var>R<sub>1</sub></var><var>R<sub>2</sub></var><var>...</var><var>R<sub>n</sub></var><kbd>]</kbd> (without <a href="#COMMA_OPTION">"," option</a>) + * <dt class="REGEX"><kbd>[</kbd><var>R<sub>1</sub></var><kbd>,</kbd><var>R<sub>2</sub></var><kbd>,</kbd><var>...</var><kbd>,</kbd><var>R<sub>n</sub></var><kbd>]</kbd> (with <a href="#COMMA_OPTION">"," option</a>) * <dd>Positive character class. It matches a character in ranges. * <dd><var>R<sub>n</sub></var>: * <ul> * <li class="REGEX">A character (including <Kbd>\e \f \n \r \t</kbd> <kbd>\u005cx</kbd><var>HH</var> <kbd>\u005cx{</kbd><var>HHHH</var><kbd>}</kbd> <!--kbd>\u005c u</kbd><var>HHHH</var--> <kbd>\u005cv</kbd><var>HHHHHH</var>) * <p>This range matches the character. * <li class="REGEX"><var>C<sub>1</sub></var><kbd>-</kbd><var>C<sub>2</sub></var> * <p>This range matches a character which has a code point that is >= <var>C<sub>1</sub></var>'s code point and <= <var>C<sub>2</sub></var>'s code point. + * <li class="REGEX">A POSIX character class: <Kbd>[:alpha:] [:alnum:] [:ascii:] [:cntrl:] [:digit:] [:graph:] [:lower:] [:print:] [:punct:] [:space:] [:upper:] [:xdigit:]</kbd>, + * and negative POSIX character classes in Perl like <kbd>[:^alpha:]</kbd> * <p>... * <li class="REGEX"><kbd>\d \D \s \S \w \W \p{</kbd><var>name</var><kbd>} \P{</kbd><var>name</var><kbd>}</kbd> * <p>These expressions specifies the same ranges as the following expressions. * </ul> * <p class="REGEX">Enumerated ranges are merged (union operation). * <kbd>[a-ec-z]</kbd> is equivalent to <kbd>[a-z]</kbd> * * <dt class="REGEX"><kbd>[^</kbd><var>R<sub>1</sub></var><var>R<sub>2</sub></var><var>...</var><var>R<sub>n</sub></var><kbd>]</kbd> (without a <a href="#COMMA_OPTION">"," option</a>) * <dt class="REGEX"><kbd>[^</kbd><var>R<sub>1</sub></var><kbd>,</kbd><var>R<sub>2</sub></var><kbd>,</kbd><var>...</var><kbd>,</kbd><var>R<sub>n</sub></var><kbd>]</kbd> (with a <a href="#COMMA_OPTION">"," option</a>) * <dd>Negative character class. It matches a character not in ranges. * * <dt class="REGEX"><kbd>(?[</kbd><var>ranges</var><kbd>]</kbd><var>op</var><kbd>[</kbd><var>ranges</var><kbd>]</kbd><var>op</var><kbd>[</kbd><var>ranges</var><kbd>]</kbd> ... <Kbd>)</kbd> * (<var>op</var> is <kbd>-</kbd> or <kbd>+</kbd> or <kbd>&</kbd>.) * <dd>Subtraction or union or intersection for character classes. * <dd class="REGEX">For exmaple, <kbd>(?[A-Z]-[CF])</kbd> is equivalent to <kbd>[A-BD-EG-Z]</kbd>, and <kbd>(?[0x00-0x7f]-[K]&[\p{Lu}])</kbd> is equivalent to <kbd>[A-JL-Z]</kbd>. * <dd>The result of this operations is a <u>positive character class</u> * even if an expression includes any negative character classes. * You have to take care on this in case-insensitive matching. * For instance, <kbd>(?[^b])</kbd> is equivalent to <kbd>[\x00-ac-\x{10ffff}]</kbd>, * which is equivalent to <kbd>[^b]</kbd> in case-sensitive matching. * But, in case-insensitive matching, <kbd>(?[^b])</kbd> matches any character because * it includes '<kbd>B</kbd>' and '<kbd>B</kbd>' matches '<kbd>b</kbd>' * though <kbd>[^b]</kbd> is processed as <kbd>[^Bb]</kbd>. * * <dt class="REGEX"><kbd>[</kbd><var>R<sub>1</sub>R<sub>2</sub>...</var><kbd>-[</kbd><var>R<sub>n</sub>R<sub>n+1</sub>...</var><kbd>]]</kbd> (with an <a href="#X_OPTION">"X" option</a>)</dt> * <dd>Character class subtraction for the XML Schema. * You can use this syntax when you specify an <a href="#X_OPTION">"X" option</a>. * * <dt class="REGEX"><kbd>\d</kbd> * <dd class="REGEX">Equivalent to <kbd>[0-9]</kbd>. * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>\p{Nd}</kbd></span>. * * <dt class="REGEX"><kbd>\D</kbd> * <dd class="REGEX">Equivalent to <kbd>[^0-9]</kbd> * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>\P{Nd}</kbd></span>. * * <dt class="REGEX"><kbd>\s</kbd> * <dd class="REGEX">Equivalent to <kbd>[ \f\n\r\t]</kbd> * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>[ \f\n\r\t\p{Z}]</kbd></span>. * * <dt class="REGEX"><kbd>\S</kbd> * <dd class="REGEX">Equivalent to <kbd>[^ \f\n\r\t]</kbd> * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>[^ \f\n\r\t\p{Z}]</kbd></span>. * * <dt class="REGEX"><kbd>\w</kbd> * <dd class="REGEX">Equivalent to <kbd>[a-zA-Z0-9_]</kbd> * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>[\p{Lu}\p{Ll}\p{Lo}\p{Nd}_]</kbd></span>. * * <dt class="REGEX"><kbd>\W</kbd> * <dd class="REGEX">Equivalent to <kbd>[^a-zA-Z0-9_]</kbd> * <dd>When <a href="#U_OPTION">a "u" option</a> is set, it is equivalent to * <span class="REGEX"><kbd>[^\p{Lu}\p{Ll}\p{Lo}\p{Nd}_]</kbd></span>. * * <dt class="REGEX"><kbd>\p{</kbd><var>name</var><kbd>}</kbd> * <dd>Matches one character in the specified General Category (the second field in <a href="ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt"><kbd>UnicodeData.txt</kbd></a>) or the specified <a href="ftp://ftp.unicode.org/Public/UNIDATA/Blocks.txt">Block</a>. * The following names are available: * <dl> * <dt>Unicode General Categories: * <dd><kbd> * L, M, N, Z, C, P, S, Lu, Ll, Lt, Lm, Lo, Mn, Me, Mc, Nd, Nl, No, Zs, Zl, Zp, * Cc, Cf, Cn, Co, Cs, Pd, Ps, Pe, Pc, Po, Sm, Sc, Sk, So, * </kbd> * <dd>(Currently the Cn category includes U+10000-U+10FFFF characters) * <dt>Unicode Blocks: * <dd><kbd> * Basic Latin, Latin-1 Supplement, Latin Extended-A, Latin Extended-B, * IPA Extensions, Spacing Modifier Letters, Combining Diacritical Marks, Greek, * Cyrillic, Armenian, Hebrew, Arabic, Devanagari, Bengali, Gurmukhi, Gujarati, * Oriya, Tamil, Telugu, Kannada, Malayalam, Thai, Lao, Tibetan, Georgian, * Hangul Jamo, Latin Extended Additional, Greek Extended, General Punctuation, * Superscripts and Subscripts, Currency Symbols, Combining Marks for Symbols, * Letterlike Symbols, Number Forms, Arrows, Mathematical Operators, * Miscellaneous Technical, Control Pictures, Optical Character Recognition, * Enclosed Alphanumerics, Box Drawing, Block Elements, Geometric Shapes, * Miscellaneous Symbols, Dingbats, CJK Symbols and Punctuation, Hiragana, * Katakana, Bopomofo, Hangul Compatibility Jamo, Kanbun, * Enclosed CJK Letters and Months, CJK Compatibility, CJK Unified Ideographs, * Hangul Syllables, High Surrogates, High Private Use Surrogates, Low Surrogates, * Private Use, CJK Compatibility Ideographs, Alphabetic Presentation Forms, * Arabic Presentation Forms-A, Combining Half Marks, CJK Compatibility Forms, * Small Form Variants, Arabic Presentation Forms-B, Specials, * Halfwidth and Fullwidth Forms * </kbd> * <dt>Others: * <dd><kbd>ALL</kbd> (Equivalent to <kbd>[\u005cu0000-\u005cv10FFFF]</kbd>) * <dd><kbd>ASSGINED</kbd> (<kbd>\p{ASSIGNED}</kbd> is equivalent to <kbd>\P{Cn}</kbd>) * <dd><kbd>UNASSGINED</kbd> * (<kbd>\p{UNASSIGNED}</kbd> is equivalent to <kbd>\p{Cn}</kbd>) * </dl> * * <dt class="REGEX"><kbd>\P{</kbd><var>name</var><kbd>}</kbd> * <dd>Matches one character not in the specified General Category or the specified Block. * </dl> * </li> * * <li>Selection and Quantifier * <dl> * <dt class="REGEX"><VAR>X</VAR><kbd>|</kbd><VAR>Y</VAR> * <dd>... * * <dt class="REGEX"><VAR>X</VAR><kbd>*</KBD> * <dd>Matches 0 or more <var>X</var>. * * <dt class="REGEX"><VAR>X</VAR><kbd>+</KBD> * <dd>Matches 1 or more <var>X</var>. * * <dt class="REGEX"><VAR>X</VAR><kbd>?</KBD> * <dd>Matches 0 or 1 <var>X</var>. * * <dt class="REGEX"><var>X</var><kbd>{</kbd><var>number</var><kbd>}</kbd> * <dd>Matches <var>number</var> times. * * <dt class="REGEX"><var>X</var><kbd>{</kbd><var>min</var><kbd>,}</kbd> * <dd>... * * <dt class="REGEX"><var>X</var><kbd>{</kbd><var>min</var><kbd>,</kbd><var>max</var><kbd>}</kbd> * <dd>... * * <dt class="REGEX"><VAR>X</VAR><kbd>*?</kbd> * <dt class="REGEX"><VAR>X</VAR><kbd>+?</kbd> * <dt class="REGEX"><VAR>X</VAR><kbd>??</kbd> * <dt class="REGEX"><var>X</var><kbd>{</kbd><var>min</var><kbd>,}?</kbd> * <dt class="REGEX"><var>X</var><kbd>{</kbd><var>min</var><kbd>,</kbd><var>max</var><kbd>}?</kbd> * <dd>Non-greedy matching. * </dl> * </li> * * <li>Grouping, Capturing, and Back-reference * <dl> * <dt class="REGEX"><KBD>(?:</kbd><VAR>X</VAR><kbd>)</KBD> * <dd>Grouping. "<KBD>foo+</KBD>" matches "<KBD>foo</KBD>" or "<KBD>foooo</KBD>". * If you want it matches "<KBD>foofoo</KBD>" or "<KBD>foofoofoo</KBD>", * you have to write "<KBD>(?:foo)+</KBD>". * * <dt class="REGEX"><KBD>(</kbd><VAR>X</VAR><kbd>)</KBD> * <dd>Grouping with capturing. * It make a group and applications can know * where in target text a group matched with methods of a <code>Match</code> instance * after <code><a href="#matches(java.lang.String, org.apache.xerces.utils.regex.Match)">matches(String,Match)</a></code>. * The 0th group means whole of this regular expression. * The <VAR>N</VAR>th gorup is the inside of the <VAR>N</VAR>th left parenthesis. * * <p>For instance, a regular expression is * "<FONT color=blue><KBD> *([^<:]*) +<([^>]*)> *</KBD></FONT>" * and target text is * "<FONT color=red><KBD>From: TAMURA Kent <kent@trl.ibm.co.jp></KBD></FONT>": * <ul> * <li><code>Match.getCapturedText(0)</code>: * "<FONT color=red><KBD> TAMURA Kent <kent@trl.ibm.co.jp></KBD></FONT>" * <li><code>Match.getCapturedText(1)</code>: "<FONT color=red><KBD>TAMURA Kent</KBD></FONT>" * <li><code>Match.getCapturedText(2)</code>: "<FONT color=red><KBD>kent@trl.ibm.co.jp</KBD></FONT>" * </ul> * * <dt class="REGEX"><kbd>\1 \2 \3 \4 \5 \6 \7 \8 \9</kbd> * <dd> * * <dt class="REGEX"><kbd>(?></kbd><var>X</var><kbd>)</kbd> * <dd>Independent expression group. ................ * * <dt class="REGEX"><kbd>(?</kbd><var>options</var><kbd>:</kbd><var>X</var><kbd>)</kbd> * <dt class="REGEX"><kbd>(?</kbd><var>options</var><kbd>-</kbd><var>options2</var><kbd>:</kbd><var>X</var><kbd>)</kbd> * <dd>............................ * <dd>The <var>options</var> or the <var>options2</var> consists of 'i' 'm' 's' 'w'. * Note that it can not contain 'u'. * * <dt class="REGEX"><kbd>(?</kbd><var>options</var><kbd>)</kbd> * <dt class="REGEX"><kbd>(?</kbd><var>options</var><kbd>-</kbd><var>options2</var><kbd>)</kbd> * <dd>...... * <dd>These expressions must be at the beginning of a group. * </dl> * </li> * * <li>Anchor * <dl> * <dt class="REGEX"><kbd>\A</kbd> * <dd>Matches the beginnig of the text. * * <dt class="REGEX"><kbd>\Z</kbd> * <dd>Matches the end of the text, or before an EOL character at the end of the text, * or CARRIAGE RETURN + LINE FEED at the end of the text. * * <dt class="REGEX"><kbd>\z</kbd> * <dd>Matches the end of the text. * * <dt class="REGEX"><kbd>^</kbd> * <dd>Matches the beginning of the text. It is equivalent to <span class="REGEX"><Kbd>\A</kbd></span>. * <dd>When <a href="#M_OPTION">a "m" option</a> is set, * it matches the beginning of the text, or after one of EOL characters ( * LINE FEED (U+000A), CARRIAGE RETURN (U+000D), LINE SEPARATOR (U+2028), * PARAGRAPH SEPARATOR (U+2029).) * * <dt class="REGEX"><kbd>$</kbd> * <dd>Matches the end of the text, or before an EOL character at the end of the text, * or CARRIAGE RETURN + LINE FEED at the end of the text. * <dd>When <a href="#M_OPTION">a "m" option</a> is set, * it matches the end of the text, or before an EOL character. * * <dt class="REGEX"><kbd>\b</kbd> * <dd>Matches word boundary. * (See <a href="#W_OPTION">a "w" option</a>) * * <dt class="REGEX"><kbd>\B</kbd> * <dd>Matches non word boundary. * (See <a href="#W_OPTION">a "w" option</a>) * * <dt class="REGEX"><kbd>\<</kbd> * <dd>Matches the beginning of a word. * (See <a href="#W_OPTION">a "w" option</a>) * * <dt class="REGEX"><kbd>\></kbd> * <dd>Matches the end of a word. * (See <a href="#W_OPTION">a "w" option</a>) * </dl> * </li> * <li>Lookahead and lookbehind * <dl> * <dt class="REGEX"><kbd>(?=</kbd><var>X</var><kbd>)</kbd> * <dd>Lookahead. * * <dt class="REGEX"><kbd>(?!</kbd><var>X</var><kbd>)</kbd> * <dd>Negative lookahead. * * <dt class="REGEX"><kbd>(?<=</kbd><var>X</var><kbd>)</kbd> * <dd>Lookbehind. * <dd>(Note for text capturing......) * * <dt class="REGEX"><kbd>(?<!</kbd><var>X</var><kbd>)</kbd> * <dd>Negative lookbehind. * </dl> * </li> * * <li>Misc. * <dl> * <dt class="REGEX"><kbd>(?(</Kbd><var>condition</var><Kbd>)</kbd><var>yes-pattern</var><kbd>|</kbd><var>no-pattern</var><kbd>)</kbd>, * <dt class="REGEX"><kbd>(?(</kbd><var>condition</var><kbd>)</kbd><var>yes-pattern</var><kbd>)</kbd> * <dd>...... * <dt class="REGEX"><kbd>(?#</kbd><var>comment</var><kbd>)</kbd> * <dd>Comment. A comment string consists of characters except '<kbd>)</kbd>'. * You can not write comments in character classes and before quantifiers. * </dl> * </li> * </ul> * * * <hr width="50%"> * <h3>BNF for the regular expression</h3> * <pre> * regex ::= ('(?' options ')')? term ('|' term)* * term ::= factor+ * factor ::= anchors | atom (('*' | '+' | '?' | minmax ) '?'? )? * | '(?#' [^)]* ')' * minmax ::= '{' ([0-9]+ | [0-9]+ ',' | ',' [0-9]+ | [0-9]+ ',' [0-9]+) '}' * atom ::= char | '.' | char-class | '(' regex ')' | '(?:' regex ')' | '\' [0-9] * | '\w' | '\W' | '\d' | '\D' | '\s' | '\S' | category-block | '\X' * | '(?>' regex ')' | '(?' options ':' regex ')' * | '(?' ('(' [0-9] ')' | '(' anchors ')' | looks) term ('|' term)? ')' * options ::= [imsw]* ('-' [imsw]+)? * anchors ::= '^' | '$' | '\A' | '\Z' | '\z' | '\b' | '\B' | '\<' | '\>' * looks ::= '(?=' regex ')' | '(?!' regex ')' * | '(?<=' regex ')' | '(?<!' regex ')' * char ::= '\\' | '\' [efnrtv] | '\c' [@-_] | code-point | character-1 * category-block ::= '\' [pP] category-symbol-1 * | ('\p{' | '\P{') (category-symbol | block-name * | other-properties) '}' * category-symbol-1 ::= 'L' | 'M' | 'N' | 'Z' | 'C' | 'P' | 'S' * category-symbol ::= category-symbol-1 | 'Lu' | 'Ll' | 'Lt' | 'Lm' | Lo' * | 'Mn' | 'Me' | 'Mc' | 'Nd' | 'Nl' | 'No' * | 'Zs' | 'Zl' | 'Zp' | 'Cc' | 'Cf' | 'Cn' | 'Co' | 'Cs' * | 'Pd' | 'Ps' | 'Pe' | 'Pc' | 'Po' * | 'Sm' | 'Sc' | 'Sk' | 'So' * block-name ::= (See above) * other-properties ::= 'ALL' | 'ASSIGNED' | 'UNASSIGNED' * character-1 ::= (any character except meta-characters) * * char-class ::= '[' ranges ']' * | '(?[' ranges ']' ([-+&] '[' ranges ']')? ')' * ranges ::= '^'? (range <a href="#COMMA_OPTION">','?</a>)+ * range ::= '\d' | '\w' | '\s' | '\D' | '\W' | '\S' | category-block * | range-char | range-char '-' range-char * range-char ::= '\[' | '\]' | '\\' | '\' [,-efnrtv] | code-point | character-2 * code-point ::= '\x' hex-char hex-char * | '\x{' hex-char+ '}' * <!-- | '\u005c u' hex-char hex-char hex-char hex-char * --> | '\v' hex-char hex-char hex-char hex-char hex-char hex-char * hex-char ::= [0-9a-fA-F] * character-2 ::= (any character except \[]-,) * </pre> * * <hr width="50%"> * <h3>TODO</h3> * <ul> * <li><a href="http://www.unicode.org/unicode/reports/tr18/">Unicode Regular Expression Guidelines</a> * <ul> * <li>2.4 Canonical Equivalents * <li>Level 3 * </ul> * <li>Parsing performance * </ul> * * <hr width="50%"> * * @xerces.internal * * @author TAMURA Kent <kent@trl.ibm.co.jp> * @version $Id: RegularExpression.java 961928 2010-07-08 20:43:46Z knoaman $ */ public class RegularExpression implements java.io.Serializable { private static final long serialVersionUID = 6242499334195006401L; static final boolean DEBUG = false; /** * Compiles a token tree into an operation flow. */ private synchronized void compile(Token tok) { if (this.operations != null) return; this.numberOfClosures = 0; this.operations = this.compile(tok, null, false); } /** * Converts a token to an operation. */ private Op compile(Token tok, Op next, boolean reverse) { Op ret; switch (tok.type) { case Token.DOT: ret = Op.createDot(); ret.next = next; break; case Token.CHAR: ret = Op.createChar(tok.getChar()); ret.next = next; break; case Token.ANCHOR: ret = Op.createAnchor(tok.getChar()); ret.next = next; break; case Token.RANGE: case Token.NRANGE: ret = Op.createRange(tok); ret.next = next; break; case Token.CONCAT: ret = next; if (!reverse) { for (int i = tok.size()-1; i >= 0; i --) { ret = compile(tok.getChild(i), ret, false); } } else { for (int i = 0; i < tok.size(); i ++) { ret = compile(tok.getChild(i), ret, true); } } break; case Token.UNION: Op.UnionOp uni = Op.createUnion(tok.size()); for (int i = 0; i < tok.size(); i ++) { uni.addElement(compile(tok.getChild(i), next, reverse)); } ret = uni; // ret.next is null. break; case Token.CLOSURE: case Token.NONGREEDYCLOSURE: Token child = tok.getChild(0); int min = tok.getMin(); int max = tok.getMax(); if (min >= 0 && min == max) { // {n} ret = next; for (int i = 0; i < min; i ++) { ret = compile(child, ret, reverse); } break; } if (min > 0 && max > 0) max -= min; if (max > 0) { // X{2,6} -> XX(X(X(XX?)?)?)? ret = next; for (int i = 0; i < max; i ++) { Op.ChildOp q = Op.createQuestion(tok.type == Token.NONGREEDYCLOSURE); q.next = next; q.setChild(compile(child, ret, reverse)); ret = q; } } else { Op.ChildOp op; if (tok.type == Token.NONGREEDYCLOSURE) { op = Op.createNonGreedyClosure(); } else { // Token.CLOSURE op = Op.createClosure(this.numberOfClosures++); } op.next = next; op.setChild(compile(child, op, reverse)); ret = op; } if (min > 0) { for (int i = 0; i < min; i ++) { ret = compile(child, ret, reverse); } } break; case Token.EMPTY: ret = next; break; case Token.STRING: ret = Op.createString(tok.getString()); ret.next = next; break; case Token.BACKREFERENCE: ret = Op.createBackReference(tok.getReferenceNumber()); ret.next = next; break; case Token.PAREN: if (tok.getParenNumber() == 0) { ret = compile(tok.getChild(0), next, reverse); } else if (reverse) { next = Op.createCapture(tok.getParenNumber(), next); next = compile(tok.getChild(0), next, reverse); ret = Op.createCapture(-tok.getParenNumber(), next); } else { next = Op.createCapture(-tok.getParenNumber(), next); next = compile(tok.getChild(0), next, reverse); ret = Op.createCapture(tok.getParenNumber(), next); } break; case Token.LOOKAHEAD: ret = Op.createLook(Op.LOOKAHEAD, next, compile(tok.getChild(0), null, false)); break; case Token.NEGATIVELOOKAHEAD: ret = Op.createLook(Op.NEGATIVELOOKAHEAD, next, compile(tok.getChild(0), null, false)); break; case Token.LOOKBEHIND: ret = Op.createLook(Op.LOOKBEHIND, next, compile(tok.getChild(0), null, true)); break; case Token.NEGATIVELOOKBEHIND: ret = Op.createLook(Op.NEGATIVELOOKBEHIND, next, compile(tok.getChild(0), null, true)); break; case Token.INDEPENDENT: ret = Op.createIndependent(next, compile(tok.getChild(0), null, reverse)); break; case Token.MODIFIERGROUP: ret = Op.createModifier(next, compile(tok.getChild(0), null, reverse), ((Token.ModifierToken)tok).getOptions(), ((Token.ModifierToken)tok).getOptionsMask()); break; case Token.CONDITION: Token.ConditionToken ctok = (Token.ConditionToken)tok; int ref = ctok.refNumber; Op condition = ctok.condition == null ? null : compile(ctok.condition, null, reverse); Op yes = compile(ctok.yes, next, reverse); Op no = ctok.no == null ? null : compile(ctok.no, next, reverse); ret = Op.createCondition(next, ref, condition, yes, no); break; default: throw new RuntimeException("Unknown token type: "+tok.type); } // switch (tok.type) return ret; } //Public /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @return true if the target is matched to this regular expression. */ public boolean matches(char[] target) { return this.matches(target, 0, target .length , (Match)null); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern * in specified range or not. * * @param start Start offset of the range. * @param end End offset +1 of the range. * @return true if the target is matched to this regular expression. */ public boolean matches(char[] target, int start, int end) { return this.matches(target, start, end, (Match)null); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @param match A Match instance for storing matching result. * @return Offset of the start position in <VAR>target</VAR>; or -1 if not match. */ public boolean matches(char[] target, Match match) { return this.matches(target, 0, target .length , match); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern * in specified range or not. * * @param start Start offset of the range. * @param end End offset +1 of the range. * @param match A Match instance for storing matching result. * @return Offset of the start position in <VAR>target</VAR>; or -1 if not match. */ public boolean matches(char[] target, int start, int end, Match match) { synchronized (this) { if (this.operations == null) this.prepare(); if (this.context == null) this.context = new Context(); } Context con = null; synchronized (this.context) { con = this.context.inuse ? new Context() : this.context; con.reset(target, start, end, this.numberOfClosures); } if (match != null) { match.setNumberOfGroups(this.nofparen); match.setSource(target); } else if (this.hasBackReferences) { match = new Match(); match.setNumberOfGroups(this.nofparen); // Need not to call setSource() because // a caller can not access this match instance. } con.match = match; if (RegularExpression.isSet(this.options, XMLSCHEMA_MODE)) { int matchEnd = this. match(con, this.operations, con.start, 1, this.options); //System.err.println("DEBUG: matchEnd="+matchEnd); if (matchEnd == con.limit) { if (con.match != null) { con.match.setBeginning(0, con.start); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } return false; } /* * The pattern has only fixed string. * The engine uses Boyer-Moore. */ if (this.fixedStringOnly) { //System.err.println("DEBUG: fixed-only: "+this.fixedString); int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o >= 0) { if (con.match != null) { con.match.setBeginning(0, o); con.match.setEnd(0, o+this.fixedString.length()); } con.setInUse(false); return true; } con.setInUse(false); return false; } /* * The pattern contains a fixed string. * The engine checks with Boyer-Moore whether the text contains the fixed string or not. * If not, it return with false. */ if (this.fixedString != null) { int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o < 0) { //System.err.println("Non-match in fixed-string search."); con.setInUse(false); return false; } } int limit = con.limit-this.minlength; int matchStart; int matchEnd = -1; /* * Checks whether the expression starts with ".*". */ if (this.operations != null && this.operations.type == Op.CLOSURE && this.operations.getChild().type == Op.DOT) { if (isSet(this.options, SINGLE_LINE)) { matchStart = con.start; matchEnd = this. match(con, this.operations, con.start, 1, this.options); } else { boolean previousIsEOL = true; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target [ matchStart ] ; if (isEOLChar(ch)) { previousIsEOL = true; } else { if (previousIsEOL) { if (0 <= (matchEnd = this. match(con, this.operations, matchStart, 1, this.options))) break; } previousIsEOL = false; } } } } /* * Optimization against the first character. */ else if (this.firstChar != null) { //System.err.println("DEBUG: with firstchar-matching: "+this.firstChar); RangeToken range = this.firstChar; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target [matchStart] ; if (REUtil.isHighSurrogate(ch) && matchStart+1 < con.limit) { ch = REUtil.composeFromSurrogates(ch, target[matchStart+1]); } if (!range.match(ch)) { continue; } if (0 <= (matchEnd = this. match(con, this.operations, matchStart, 1, this.options))) { break; } } } /* * Straightforward matching. */ else { for (matchStart = con.start; matchStart <= limit; matchStart ++) { if (0 <= (matchEnd = this. match(con, this.operations, matchStart, 1, this.options))) break; } } if (matchEnd >= 0) { if (con.match != null) { con.match.setBeginning(0, matchStart); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } else { con.setInUse(false); return false; } } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @return true if the target is matched to this regular expression. */ public boolean matches(String target) { return this.matches(target, 0, target .length() , (Match)null); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern * in specified range or not. * * @param start Start offset of the range. * @param end End offset +1 of the range. * @return true if the target is matched to this regular expression. */ public boolean matches(String target, int start, int end) { return this.matches(target, start, end, (Match)null); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @param match A Match instance for storing matching result. * @return Offset of the start position in <VAR>target</VAR>; or -1 if not match. */ public boolean matches(String target, Match match) { return this.matches(target, 0, target .length() , match); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern * in specified range or not. * * @param start Start offset of the range. * @param end End offset +1 of the range. * @param match A Match instance for storing matching result. * @return Offset of the start position in <VAR>target</VAR>; or -1 if not match. */ public boolean matches(String target, int start, int end, Match match) { synchronized (this) { if (this.operations == null) this.prepare(); if (this.context == null) this.context = new Context(); } Context con = null; synchronized (this.context) { con = this.context.inuse ? new Context() : this.context; con.reset(target, start, end, this.numberOfClosures); } if (match != null) { match.setNumberOfGroups(this.nofparen); match.setSource(target); } else if (this.hasBackReferences) { match = new Match(); match.setNumberOfGroups(this.nofparen); // Need not to call setSource() because // a caller can not access this match instance. } con.match = match; if (RegularExpression.isSet(this.options, XMLSCHEMA_MODE)) { if (DEBUG) { System.err.println("target string="+target); } int matchEnd = this. match(con, this.operations, con.start, 1, this.options); if (DEBUG) { System.err.println("matchEnd="+matchEnd); System.err.println("con.limit="+con.limit); } if (matchEnd == con.limit) { if (con.match != null) { con.match.setBeginning(0, con.start); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } return false; } /* * The pattern has only fixed string. * The engine uses Boyer-Moore. */ if (this.fixedStringOnly) { //System.err.println("DEBUG: fixed-only: "+this.fixedString); int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o >= 0) { if (con.match != null) { con.match.setBeginning(0, o); con.match.setEnd(0, o+this.fixedString.length()); } con.setInUse(false); return true; } con.setInUse(false); return false; } /* * The pattern contains a fixed string. * The engine checks with Boyer-Moore whether the text contains the fixed string or not. * If not, it return with false. */ if (this.fixedString != null) { int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o < 0) { //System.err.println("Non-match in fixed-string search."); con.setInUse(false); return false; } } int limit = con.limit-this.minlength; int matchStart; int matchEnd = -1; /* * Checks whether the expression starts with ".*". */ if (this.operations != null && this.operations.type == Op.CLOSURE && this.operations.getChild().type == Op.DOT) { if (isSet(this.options, SINGLE_LINE)) { matchStart = con.start; matchEnd = this.match(con, this.operations, con.start, 1, this.options); } else { boolean previousIsEOL = true; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target .charAt( matchStart ) ; if (isEOLChar(ch)) { previousIsEOL = true; } else { if (previousIsEOL) { if (0 <= (matchEnd = this.match(con, this.operations, matchStart, 1, this.options))) break; } previousIsEOL = false; } } } } /* * Optimization against the first character. */ else if (this.firstChar != null) { //System.err.println("DEBUG: with firstchar-matching: "+this.firstChar); RangeToken range = this.firstChar; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target .charAt( matchStart ) ; if (REUtil.isHighSurrogate(ch) && matchStart+1 < con.limit) { ch = REUtil.composeFromSurrogates(ch, target.charAt(matchStart+1)); } if (!range.match(ch)) { continue; } if (0 <= (matchEnd = this.match(con, this.operations, matchStart, 1, this.options))) { break; } } } /* * Straightforward matching. */ else { for (matchStart = con.start; matchStart <= limit; matchStart ++) { if (0 <= (matchEnd = this.match(con, this.operations, matchStart, 1, this.options))) break; } } if (matchEnd >= 0) { if (con.match != null) { con.match.setBeginning(0, matchStart); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } else { con.setInUse(false); return false; } } /** * @return -1 when not match; offset of the end of matched string when match. */ private int match(Context con, Op op, int offset, int dx, int opts) { final ExpressionTarget target = con.target; final Stack opStack = new Stack(); final IntStack dataStack = new IntStack(); final boolean isSetIgnoreCase = isSet(opts, IGNORE_CASE); int retValue = -1; boolean returned = false; for (;;) { if (op == null || offset > con.limit || offset < con.start) { if (op == null) { retValue = isSet(opts, XMLSCHEMA_MODE) && offset != con.limit ? -1 : offset; } else { retValue = -1; } returned = true; } else { retValue = -1; // dx value is either 1 or -1 switch (op.type) { case Op.CHAR: { final int o1 = (dx > 0) ? offset : offset -1; if (o1 >= con.limit || o1 < 0 || !matchChar(op.getData(), target.charAt(o1), isSetIgnoreCase)) { returned = true; break; } offset += dx; op = op.next; } break; case Op.DOT: { int o1 = (dx > 0) ? offset : offset - 1; if (o1 >= con.limit || o1 < 0) { returned = true; break; } if (isSet(opts, SINGLE_LINE)) { if (REUtil.isHighSurrogate(target.charAt(o1)) && o1+dx >= 0 && o1+dx < con.limit) { o1 += dx; } } else { int ch = target.charAt(o1); if (REUtil.isHighSurrogate(ch) && o1+dx >= 0 && o1+dx < con.limit) { o1 += dx; ch = REUtil.composeFromSurrogates(ch, target.charAt(o1)); } if (isEOLChar(ch)) { returned = true; break; } } offset = (dx > 0) ? o1 + 1 : o1; op = op.next; } break; case Op.RANGE: case Op.NRANGE: { int o1 = (dx > 0) ? offset : offset -1; if (o1 >= con.limit || o1 < 0) { returned = true; break; } int ch = target.charAt(offset); if (REUtil.isHighSurrogate(ch) && o1+dx < con.limit && o1+dx >=0) { o1 += dx; ch = REUtil.composeFromSurrogates(ch, target.charAt(o1)); } final RangeToken tok = op.getToken(); if (!tok.match(ch)) { returned = true; break; } offset = (dx > 0) ? o1+1 : o1; op = op.next; } break; case Op.ANCHOR: { if (!matchAnchor(target, op, con, offset, opts)) { returned = true; break; } op = op.next; } break; case Op.BACKREFERENCE: { int refno = op.getData(); if (refno <= 0 || refno >= this.nofparen) { throw new RuntimeException("Internal Error: Reference number must be more than zero: "+refno); } if (con.match.getBeginning(refno) < 0 || con.match.getEnd(refno) < 0) { returned = true; break; } int o2 = con.match.getBeginning(refno); int literallen = con.match.getEnd(refno)-o2; if (dx > 0) { if (!target.regionMatches(isSetIgnoreCase, offset, con.limit, o2, literallen)) { returned = true; break; } offset += literallen; } else { if (!target.regionMatches(isSetIgnoreCase, offset-literallen, con.limit, o2, literallen)) { returned = true; break; } offset -= literallen; } op = op.next; } break; case Op.STRING: { String literal = op.getString(); int literallen = literal.length(); if (dx > 0) { if (!target.regionMatches(isSetIgnoreCase, offset, con.limit, literal, literallen)) { returned = true; break; } offset += literallen; } else { if (!target.regionMatches(isSetIgnoreCase, offset-literallen, con.limit, literal, literallen)) { returned = true; break; } offset -= literallen; } op = op.next; } break; case Op.CLOSURE: { // Saves current position to avoid zero-width repeats. final int id = op.getData(); if (con.closureContexts[id].contains(offset)) { returned = true; break; } con.closureContexts[id].addOffset(offset); } // fall through case Op.QUESTION: { opStack.push(op); dataStack.push(offset); op = op.getChild(); } break; case Op.NONGREEDYCLOSURE: case Op.NONGREEDYQUESTION: { opStack.push(op); dataStack.push(offset); op = op.next; } break; case Op.UNION: if (op.size() == 0) { returned = true; } else { opStack.push(op); dataStack.push(0); dataStack.push(offset); op = op.elementAt(0); } break; case Op.CAPTURE: { final int refno = op.getData(); if (con.match != null) { if (refno > 0) { dataStack.push(con.match.getBeginning(refno)); con.match.setBeginning(refno, offset); } else { final int index = -refno; dataStack.push(con.match.getEnd(index)); con.match.setEnd(index, offset); } opStack.push(op); dataStack.push(offset); } op = op.next; } break; case Op.LOOKAHEAD: case Op.NEGATIVELOOKAHEAD: case Op.LOOKBEHIND: case Op.NEGATIVELOOKBEHIND: { opStack.push(op); dataStack.push(dx); dataStack.push(offset); dx = (op.type == Op.LOOKAHEAD || op.type == Op.NEGATIVELOOKAHEAD) ? 1 : -1; op = op.getChild(); } break; case Op.INDEPENDENT: { opStack.push(op); dataStack.push(offset); op = op.getChild(); } break; case Op.MODIFIER: { int localopts = opts; localopts |= op.getData(); localopts &= ~op.getData2(); opStack.push(op); dataStack.push(opts); dataStack.push(offset); opts = localopts; op = op.getChild(); } break; case Op.CONDITION: { Op.ConditionOp cop = (Op.ConditionOp)op; if (cop.refNumber > 0) { if (cop.refNumber >= this.nofparen) { throw new RuntimeException("Internal Error: Reference number must be more than zero: "+cop.refNumber); } if (con.match.getBeginning(cop.refNumber) >= 0 && con.match.getEnd(cop.refNumber) >= 0) { op = cop.yes; } else if (cop.no != null) { op = cop.no; } else { op = cop.next; } } else { opStack.push(op); dataStack.push(offset); op = cop.condition; } } break; default: throw new RuntimeException("Unknown operation type: " + op.type); } } // handle recursive operations while (returned) { // exhausted all the operations if (opStack.isEmpty()) { return retValue; } op = (Op) opStack.pop(); offset = dataStack.pop(); switch (op.type) { case Op.CLOSURE: case Op.QUESTION: if (retValue < 0) { op = op.next; returned = false; } break; case Op.NONGREEDYCLOSURE: case Op.NONGREEDYQUESTION: if (retValue < 0) { op = op.getChild(); returned = false; } break; case Op.UNION: { int unionIndex = dataStack.pop(); if (DEBUG) { System.err.println("UNION: "+unionIndex+", ret="+retValue); } if (retValue < 0) { if (++unionIndex < op.size()) { opStack.push(op); dataStack.push(unionIndex); dataStack.push(offset); op = op.elementAt(unionIndex); returned = false; } else { retValue = -1; } } } break; case Op.CAPTURE: final int refno = op.getData(); final int saved = dataStack.pop(); if (retValue < 0) { if (refno > 0) { con.match.setBeginning(refno, saved); } else { con.match.setEnd(-refno, saved); } } break; case Op.LOOKAHEAD: case Op.LOOKBEHIND: { dx = dataStack.pop(); if (0 <= retValue) { op = op.next; returned = false; } retValue = -1; } break; case Op.NEGATIVELOOKAHEAD: case Op.NEGATIVELOOKBEHIND: { dx = dataStack.pop(); if (0 > retValue) { op = op.next; returned = false; } retValue = -1; } break; case Op.MODIFIER: opts = dataStack.pop(); // fall through case Op.INDEPENDENT: if (retValue >= 0) { offset = retValue; op = op.next; returned = false; } break; case Op.CONDITION: { final Op.ConditionOp cop = (Op.ConditionOp)op; if (0 <= retValue) { op = cop.yes; } else if (cop.no != null) { op = cop.no; } else { op = cop.next; } } returned = false; break; default: break; } } } } private boolean matchChar(int ch, int other, boolean ignoreCase) { return (ignoreCase) ? matchIgnoreCase(ch, other) : ch == other; } boolean matchAnchor(ExpressionTarget target, Op op, Context con, int offset, int opts) { boolean go = false; switch (op.getData()) { case '^': if (isSet(opts, MULTIPLE_LINES)) { if (!(offset == con.start || offset > con.start && offset < con.limit && isEOLChar(target.charAt(offset-1)))) return false; } else { if (offset != con.start) return false; } break; case '@': // Internal use only. // The @ always matches line beginnings. if (!(offset == con.start || offset > con.start && isEOLChar(target.charAt(offset-1)))) return false; break; case '$': if (isSet(opts, MULTIPLE_LINES)) { if (!(offset == con.limit || offset < con.limit && isEOLChar(target.charAt(offset)))) return false; } else { if (!(offset == con.limit || offset+1 == con.limit && isEOLChar(target.charAt(offset)) || offset+2 == con.limit && target.charAt(offset) == CARRIAGE_RETURN && target.charAt(offset+1) == LINE_FEED)) return false; } break; case 'A': if (offset != con.start) return false; break; case 'Z': if (!(offset == con.limit || offset+1 == con.limit && isEOLChar(target.charAt(offset)) || offset+2 == con.limit && target.charAt(offset) == CARRIAGE_RETURN && target.charAt(offset+1) == LINE_FEED)) return false; break; case 'z': if (offset != con.limit) return false; break; case 'b': if (con.length == 0) return false; { int after = getWordType(target, con.start, con.limit, offset, opts); if (after == WT_IGNORE) return false; int before = getPreviousWordType(target, con.start, con.limit, offset, opts); if (after == before) return false; } break; case 'B': if (con.length == 0) go = true; else { int after = getWordType(target, con.start, con.limit, offset, opts); go = after == WT_IGNORE || after == getPreviousWordType(target, con.start, con.limit, offset, opts); } if (!go) return false; break; case '<': if (con.length == 0 || offset == con.limit) return false; if (getWordType(target, con.start, con.limit, offset, opts) != WT_LETTER || getPreviousWordType(target, con.start, con.limit, offset, opts) != WT_OTHER) return false; break; case '>': if (con.length == 0 || offset == con.start) return false; if (getWordType(target, con.start, con.limit, offset, opts) != WT_OTHER || getPreviousWordType(target, con.start, con.limit, offset, opts) != WT_LETTER) return false; break; } // switch anchor type return true; } private static final int getPreviousWordType(ExpressionTarget target, int begin, int end, int offset, int opts) { int ret = getWordType(target, begin, end, --offset, opts); while (ret == WT_IGNORE) ret = getWordType(target, begin, end, --offset, opts); return ret; } private static final int getWordType(ExpressionTarget target, int begin, int end, int offset, int opts) { if (offset < begin || offset >= end) return WT_OTHER; return getWordType0(target.charAt(offset) , opts); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @return true if the target is matched to this regular expression. */ public boolean matches(CharacterIterator target) { return this.matches(target, (Match)null); } /** * Checks whether the <var>target</var> text <strong>contains</strong> this pattern or not. * * @param match A Match instance for storing matching result. * @return Offset of the start position in <VAR>target</VAR>; or -1 if not match. */ public boolean matches(CharacterIterator target, Match match) { int start = target.getBeginIndex(); int end = target.getEndIndex(); synchronized (this) { if (this.operations == null) this.prepare(); if (this.context == null) this.context = new Context(); } Context con = null; synchronized (this.context) { con = this.context.inuse ? new Context() : this.context; con.reset(target, start, end, this.numberOfClosures); } if (match != null) { match.setNumberOfGroups(this.nofparen); match.setSource(target); } else if (this.hasBackReferences) { match = new Match(); match.setNumberOfGroups(this.nofparen); // Need not to call setSource() because // a caller can not access this match instance. } con.match = match; if (RegularExpression.isSet(this.options, XMLSCHEMA_MODE)) { int matchEnd = this.match(con, this.operations, con.start, 1, this.options); //System.err.println("DEBUG: matchEnd="+matchEnd); if (matchEnd == con.limit) { if (con.match != null) { con.match.setBeginning(0, con.start); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } return false; } /* * The pattern has only fixed string. * The engine uses Boyer-Moore. */ if (this.fixedStringOnly) { //System.err.println("DEBUG: fixed-only: "+this.fixedString); int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o >= 0) { if (con.match != null) { con.match.setBeginning(0, o); con.match.setEnd(0, o+this.fixedString.length()); } con.setInUse(false); return true; } con.setInUse(false); return false; } /* * The pattern contains a fixed string. * The engine checks with Boyer-Moore whether the text contains the fixed string or not. * If not, it return with false. */ if (this.fixedString != null) { int o = this.fixedStringTable.matches(target, con.start, con.limit); if (o < 0) { //System.err.println("Non-match in fixed-string search."); con.setInUse(false); return false; } } int limit = con.limit-this.minlength; int matchStart; int matchEnd = -1; /* * Checks whether the expression starts with ".*". */ if (this.operations != null && this.operations.type == Op.CLOSURE && this.operations.getChild().type == Op.DOT) { if (isSet(this.options, SINGLE_LINE)) { matchStart = con.start; matchEnd = this.match(con, this.operations, con.start, 1, this.options); } else { boolean previousIsEOL = true; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target .setIndex( matchStart ) ; if (isEOLChar(ch)) { previousIsEOL = true; } else { if (previousIsEOL) { if (0 <= (matchEnd = this.match(con, this.operations, matchStart, 1, this.options))) break; } previousIsEOL = false; } } } } /* * Optimization against the first character. */ else if (this.firstChar != null) { //System.err.println("DEBUG: with firstchar-matching: "+this.firstChar); RangeToken range = this.firstChar; for (matchStart = con.start; matchStart <= limit; matchStart ++) { int ch = target .setIndex( matchStart ) ; if (REUtil.isHighSurrogate(ch) && matchStart+1 < con.limit) { ch = REUtil.composeFromSurrogates(ch, target.setIndex(matchStart+1)); } if (!range.match(ch)) { continue; } if (0 <= (matchEnd = this.match(con, this.operations, matchStart, 1, this.options))) { break; } } } /* * Straightforward matching. */ else { for (matchStart = con.start; matchStart <= limit; matchStart ++) { if (0 <= (matchEnd = this. match(con, this.operations, matchStart, 1, this.options))) break; } } if (matchEnd >= 0) { if (con.match != null) { con.match.setBeginning(0, matchStart); con.match.setEnd(0, matchEnd); } con.setInUse(false); return true; } else { con.setInUse(false); return false; } } // ================================================================ /** * A regular expression. * @serial */ String regex; /** * @serial */ int options; /** * The number of parenthesis in the regular expression. * @serial */ int nofparen; /** * Internal representation of the regular expression. * @serial */ Token tokentree; boolean hasBackReferences = false; transient int minlength; transient Op operations = null; transient int numberOfClosures; transient Context context = null; transient RangeToken firstChar = null; transient String fixedString = null; transient int fixedStringOptions; transient BMPattern fixedStringTable = null; transient boolean fixedStringOnly = false; static abstract class ExpressionTarget { abstract char charAt(int index); abstract boolean regionMatches(boolean ignoreCase, int offset, int limit, String part, int partlen); abstract boolean regionMatches(boolean ignoreCase, int offset, int limit, int offset2, int partlen); } static final class StringTarget extends ExpressionTarget { private String target; StringTarget(String target) { this.target = target; } final void resetTarget(String target) { this.target = target; } final char charAt(int index) { return target.charAt(index); } final boolean regionMatches(boolean ignoreCase, int offset, int limit, String part, int partlen) { if (limit-offset < partlen) { return false; } return (ignoreCase) ? target.regionMatches(true, offset, part, 0, partlen) : target.regionMatches(offset, part, 0, partlen); } final boolean regionMatches(boolean ignoreCase, int offset, int limit, int offset2, int partlen) { if (limit-offset < partlen) { return false; } return (ignoreCase) ? target.regionMatches(true, offset, target, offset2, partlen) : target.regionMatches(offset, target, offset2, partlen); } } static final class CharArrayTarget extends ExpressionTarget { char[] target; CharArrayTarget(char[] target) { this.target = target; } final void resetTarget(char[] target) { this.target = target; } char charAt(int index) { return target[index]; } final boolean regionMatches(boolean ignoreCase, int offset, int limit, String part, int partlen) { if (offset < 0 || limit-offset < partlen) { return false; } return (ignoreCase) ? regionMatchesIgnoreCase(offset, limit, part, partlen) : regionMatches(offset, limit, part, partlen); } private final boolean regionMatches(int offset, int limit, String part, int partlen) { int i = 0; while (partlen-- > 0) { if (target[offset++] != part.charAt(i++)) { return false; } } return true; } private final boolean regionMatchesIgnoreCase(int offset, int limit, String part, int partlen) { int i = 0; while (partlen-- > 0) { final char ch1 = target[offset++] ; final char ch2 = part.charAt(i++); if (ch1 == ch2) { continue; } final char uch1 = Character.toUpperCase(ch1); final char uch2 = Character.toUpperCase(ch2); if (uch1 == uch2) { continue; } if (Character.toLowerCase(uch1) != Character.toLowerCase(uch2)) { return false; } } return true; } final boolean regionMatches(boolean ignoreCase, int offset, int limit, int offset2, int partlen) { if (offset < 0 || limit-offset < partlen) { return false; } return (ignoreCase) ? regionMatchesIgnoreCase(offset, limit, offset2, partlen) : regionMatches(offset, limit, offset2, partlen); } private final boolean regionMatches(int offset, int limit, int offset2, int partlen) { int i = offset2; while (partlen-- > 0) { if ( target [ offset++ ] != target [ i++ ] ) return false; } return true; } private final boolean regionMatchesIgnoreCase(int offset, int limit, int offset2, int partlen) { int i = offset2; while (partlen-- > 0) { final char ch1 = target[offset++] ; final char ch2 = target[i++] ; if (ch1 == ch2) { continue; } final char uch1 = Character.toUpperCase(ch1); final char uch2 = Character.toUpperCase(ch2); if (uch1 == uch2) { continue; } if (Character.toLowerCase(uch1) != Character.toLowerCase(uch2)) { return false; } } return true; } } static final class CharacterIteratorTarget extends ExpressionTarget { CharacterIterator target; CharacterIteratorTarget(CharacterIterator target) { this.target = target; } final void resetTarget(CharacterIterator target) { this.target = target; } final char charAt(int index) { return target.setIndex(index); } final boolean regionMatches(boolean ignoreCase, int offset, int limit, String part, int partlen) { if (offset < 0 || limit-offset < partlen) { return false; } return (ignoreCase) ? regionMatchesIgnoreCase(offset, limit, part, partlen) : regionMatches(offset, limit, part, partlen); } private final boolean regionMatches(int offset, int limit, String part, int partlen) { int i = 0; while (partlen-- > 0) { if (target.setIndex(offset++) != part.charAt(i++)) { return false; } } return true; } private final boolean regionMatchesIgnoreCase(int offset, int limit, String part, int partlen) { int i = 0; while (partlen-- > 0) { final char ch1 = target.setIndex(offset++) ; final char ch2 = part.charAt(i++); if (ch1 == ch2) { continue; } final char uch1 = Character.toUpperCase(ch1); final char uch2 = Character.toUpperCase(ch2); if (uch1 == uch2) { continue; } if (Character.toLowerCase(uch1) != Character.toLowerCase(uch2)) { return false; } } return true; } final boolean regionMatches(boolean ignoreCase, int offset, int limit, int offset2, int partlen) { if (offset < 0 || limit-offset < partlen) { return false; } return (ignoreCase) ? regionMatchesIgnoreCase(offset, limit, offset2, partlen) : regionMatches(offset, limit, offset2, partlen); } private final boolean regionMatches(int offset, int limit, int offset2, int partlen) { int i = offset2; while (partlen-- > 0) { if (target.setIndex(offset++) != target.setIndex(i++)) { return false; } } return true; } private final boolean regionMatchesIgnoreCase(int offset, int limit, int offset2, int partlen) { int i = offset2; while (partlen-- > 0) { final char ch1 = target.setIndex(offset++) ; final char ch2 = target.setIndex(i++) ; if (ch1 == ch2) { continue; } final char uch1 = Character.toUpperCase(ch1); final char uch2 = Character.toUpperCase(ch2); if (uch1 == uch2) { continue; } if (Character.toLowerCase(uch1) != Character.toLowerCase(uch2)) { return false; } } return true; } } static final class ClosureContext { int[] offsets = new int[4]; int currentIndex = 0; boolean contains(int offset) { for (int i=0; i<currentIndex;++i) { if (offsets[i] == offset) { return true; } } return false; } void reset() { currentIndex = 0; } void addOffset(int offset) { // We do not check for duplicates, caller is responsible for that if (currentIndex == offsets.length) { offsets = expandOffsets(); } offsets[currentIndex++] = offset; } private int[] expandOffsets() { final int len = offsets.length; final int newLen = len << 1; int[] newOffsets = new int[newLen]; System.arraycopy(offsets, 0, newOffsets, 0, currentIndex); return newOffsets; } } static final class Context { int start; int limit; int length; Match match; boolean inuse = false; ClosureContext[] closureContexts; private StringTarget stringTarget; private CharArrayTarget charArrayTarget; private CharacterIteratorTarget characterIteratorTarget; ExpressionTarget target; Context() { } private void resetCommon(int nofclosures) { this.length = this.limit-this.start; setInUse(true); this.match = null; if (this.closureContexts == null || this.closureContexts.length != nofclosures) { this.closureContexts = new ClosureContext[nofclosures]; } for (int i = 0; i < nofclosures; i ++) { if (this.closureContexts[i] == null) { this.closureContexts[i] = new ClosureContext(); } else { this.closureContexts[i].reset(); } } } void reset(CharacterIterator target, int start, int limit, int nofclosures) { if (characterIteratorTarget == null) { characterIteratorTarget = new CharacterIteratorTarget(target); } else { characterIteratorTarget.resetTarget(target); } this.target = characterIteratorTarget; this.start = start; this.limit = limit; this.resetCommon(nofclosures); } void reset(String target, int start, int limit, int nofclosures) { if (stringTarget == null) { stringTarget = new StringTarget(target); } else { stringTarget.resetTarget(target); } this.target = stringTarget; this.start = start; this.limit = limit; this.resetCommon(nofclosures); } void reset(char[] target, int start, int limit, int nofclosures) { if (charArrayTarget == null) { charArrayTarget = new CharArrayTarget(target); } else { charArrayTarget.resetTarget(target); } this.target = charArrayTarget; this.start = start; this.limit = limit; this.resetCommon(nofclosures); } synchronized void setInUse(boolean inUse) { this.inuse = inUse; } } /** * Prepares for matching. This method is called just before starting matching. */ void prepare() { if (Op.COUNT) Op.nofinstances = 0; this.compile(this.tokentree); /* if (this.operations.type == Op.CLOSURE && this.operations.getChild().type == Op.DOT) { // .* Op anchor = Op.createAnchor(isSet(this.options, SINGLE_LINE) ? 'A' : '@'); anchor.next = this.operations; this.operations = anchor; } */ if (Op.COUNT) System.err.println("DEBUG: The number of operations: "+Op.nofinstances); this.minlength = this.tokentree.getMinLength(); this.firstChar = null; if (!isSet(this.options, PROHIBIT_HEAD_CHARACTER_OPTIMIZATION) && !isSet(this.options, XMLSCHEMA_MODE)) { RangeToken firstChar = Token.createRange(); int fresult = this.tokentree.analyzeFirstCharacter(firstChar, this.options); if (fresult == Token.FC_TERMINAL) { firstChar.compactRanges(); this.firstChar = firstChar; if (DEBUG) System.err.println("DEBUG: Use the first character optimization: "+firstChar); } } if (this.operations != null && (this.operations.type == Op.STRING || this.operations.type == Op.CHAR) && this.operations.next == null) { if (DEBUG) System.err.print(" *** Only fixed string! *** "); this.fixedStringOnly = true; if (this.operations.type == Op.STRING) this.fixedString = this.operations.getString(); else if (this.operations.getData() >= 0x10000) { // Op.CHAR this.fixedString = REUtil.decomposeToSurrogates(this.operations.getData()); } else { char[] ac = new char[1]; ac[0] = (char)this.operations.getData(); this.fixedString = new String(ac); } this.fixedStringOptions = this.options; this.fixedStringTable = new BMPattern(this.fixedString, 256, isSet(this.fixedStringOptions, IGNORE_CASE)); } else if (!isSet(this.options, PROHIBIT_FIXED_STRING_OPTIMIZATION) && !isSet(this.options, XMLSCHEMA_MODE)) { Token.FixedStringContainer container = new Token.FixedStringContainer(); this.tokentree.findFixedString(container, this.options); this.fixedString = container.token == null ? null : container.token.getString(); this.fixedStringOptions = container.options; if (this.fixedString != null && this.fixedString.length() < 2) this.fixedString = null; // This pattern has a fixed string of which length is more than one. if (this.fixedString != null) { this.fixedStringTable = new BMPattern(this.fixedString, 256, isSet(this.fixedStringOptions, IGNORE_CASE)); if (DEBUG) { System.err.println("DEBUG: The longest fixed string: "+this.fixedString.length() +"/" //+this.fixedString +"/"+REUtil.createOptionString(this.fixedStringOptions)); System.err.print("String: "); REUtil.dumpString(this.fixedString); } } } } /** * An option. * If you specify this option, <span class="REGEX"><kbd>(</kbd><var>X</var><kbd>)</kbd></span> * captures matched text, and <span class="REGEX"><kbd>(:?</kbd><var>X</var><kbd>)</kbd></span> * does not capture. * * @see #RegularExpression(java.lang.String,int) * @see #setPattern(java.lang.String,int) static final int MARK_PARENS = 1<<0; */ /** * "i" */ static final int IGNORE_CASE = 1<<1; /** * "s" */ static final int SINGLE_LINE = 1<<2; /** * "m" */ static final int MULTIPLE_LINES = 1<<3; /** * "x" */ static final int EXTENDED_COMMENT = 1<<4; /** * This option redefines <span class="REGEX"><kbd>\d \D \w \W \s \S</kbd></span>. * * @see #RegularExpression(java.lang.String,int) * @see #setPattern(java.lang.String,int) * @see #UNICODE_WORD_BOUNDARY */ static final int USE_UNICODE_CATEGORY = 1<<5; // "u" /** * An option. * This enables to process locale-independent word boundary for <span class="REGEX"><kbd>\b \B \< \></kbd></span>. * <p>By default, the engine considers a position between a word character * (<span class="REGEX"><Kbd>\w</kbd></span>) and a non word character * is a word boundary. * <p>By this option, the engine checks word boundaries with the method of * 'Unicode Regular Expression Guidelines' Revision 4. * * @see #RegularExpression(java.lang.String,int) * @see #setPattern(java.lang.String,int) */ static final int UNICODE_WORD_BOUNDARY = 1<<6; // "w" /** * "H" */ static final int PROHIBIT_HEAD_CHARACTER_OPTIMIZATION = 1<<7; /** * "F" */ static final int PROHIBIT_FIXED_STRING_OPTIMIZATION = 1<<8; /** * "X". XML Schema mode. */ static final int XMLSCHEMA_MODE = 1<<9; /** * ",". */ static final int SPECIAL_COMMA = 1<<10; private static final boolean isSet(int options, int flag) { return (options & flag) == flag; } /** * Creates a new RegularExpression instance. * * @param regex A regular expression * @exception org.apache.xerces.utils.regex.ParseException <VAR>regex</VAR> is not conforming to the syntax. */ public RegularExpression(String regex) throws ParseException { this(regex, null); } /** * Creates a new RegularExpression instance with options. * * @param regex A regular expression * @param options A String consisted of "i" "m" "s" "u" "w" "," "X" * @exception org.apache.xerces.utils.regex.ParseException <VAR>regex</VAR> is not conforming to the syntax. */ public RegularExpression(String regex, String options) throws ParseException { this.setPattern(regex, options); } /** * Creates a new RegularExpression instance with options. * * @param regex A regular expression * @param options A String consisted of "i" "m" "s" "u" "w" "," "X" * @exception org.apache.xerces.utils.regex.ParseException <VAR>regex</VAR> is not conforming to the syntax. */ public RegularExpression(String regex, String options, Locale locale) throws ParseException { this.setPattern(regex, options, locale); } RegularExpression(String regex, Token tok, int parens, boolean hasBackReferences, int options) { this.regex = regex; this.tokentree = tok; this.nofparen = parens; this.options = options; this.hasBackReferences = hasBackReferences; } /** * */ public void setPattern(String newPattern) throws ParseException { this.setPattern(newPattern, Locale.getDefault()); } public void setPattern(String newPattern, Locale locale) throws ParseException { this.setPattern(newPattern, this.options, locale); } private void setPattern(String newPattern, int options, Locale locale) throws ParseException { this.regex = newPattern; this.options = options; RegexParser rp = RegularExpression.isSet(this.options, RegularExpression.XMLSCHEMA_MODE) ? new ParserForXMLSchema(locale) : new RegexParser(locale); this.tokentree = rp.parse(this.regex, this.options); this.nofparen = rp.parennumber; this.hasBackReferences = rp.hasBackReferences; this.operations = null; this.context = null; } /** * */ public void setPattern(String newPattern, String options) throws ParseException { this.setPattern(newPattern, options, Locale.getDefault()); } public void setPattern(String newPattern, String options, Locale locale) throws ParseException { this.setPattern(newPattern, REUtil.parseOptions(options), locale); } /** * */ public String getPattern() { return this.regex; } /** * Represents this instence in String. */ public String toString() { return this.tokentree.toString(this.options); } /** * Returns a option string. * The order of letters in it may be different from a string specified * in a constructor or <code>setPattern()</code>. * * @see #RegularExpression(java.lang.String,java.lang.String) * @see #setPattern(java.lang.String,java.lang.String) */ public String getOptions() { return REUtil.createOptionString(this.options); } /** * Return true if patterns are the same and the options are equivalent. */ public boolean equals(Object obj) { if (obj == null) return false; if (!(obj instanceof RegularExpression)) return false; RegularExpression r = (RegularExpression)obj; return this.regex.equals(r.regex) && this.options == r.options; } boolean equals(String pattern, int options) { return this.regex.equals(pattern) && this.options == options; } /** * */ public int hashCode() { return (this.regex+"/"+this.getOptions()).hashCode(); } /** * Return the number of regular expression groups. * This method returns 1 when the regular expression has no capturing-parenthesis. * */ public int getNumberOfGroups() { return this.nofparen; } // ================================================================ private static final int WT_IGNORE = 0; private static final int WT_LETTER = 1; private static final int WT_OTHER = 2; private static final int getWordType0(char ch, int opts) { if (!isSet(opts, UNICODE_WORD_BOUNDARY)) { if (isSet(opts, USE_UNICODE_CATEGORY)) { return (Token.getRange("IsWord", true).match(ch)) ? WT_LETTER : WT_OTHER; } return isWordChar(ch) ? WT_LETTER : WT_OTHER; } switch (Character.getType(ch)) { case Character.UPPERCASE_LETTER: // L case Character.LOWERCASE_LETTER: // L case Character.TITLECASE_LETTER: // L case Character.MODIFIER_LETTER: // L case Character.OTHER_LETTER: // L case Character.LETTER_NUMBER: // N case Character.DECIMAL_DIGIT_NUMBER: // N case Character.OTHER_NUMBER: // N case Character.COMBINING_SPACING_MARK: // Mc return WT_LETTER; case Character.FORMAT: // Cf case Character.NON_SPACING_MARK: // Mn case Character.ENCLOSING_MARK: // Mc return WT_IGNORE; case Character.CONTROL: // Cc switch (ch) { case '\t': case '\n': case '\u000B': case '\f': case '\r': return WT_OTHER; default: return WT_IGNORE; } default: return WT_OTHER; } } // ================================================================ static final int LINE_FEED = 0x000A; static final int CARRIAGE_RETURN = 0x000D; static final int LINE_SEPARATOR = 0x2028; static final int PARAGRAPH_SEPARATOR = 0x2029; private static final boolean isEOLChar(int ch) { return ch == LINE_FEED || ch == CARRIAGE_RETURN || ch == LINE_SEPARATOR || ch == PARAGRAPH_SEPARATOR; } private static final boolean isWordChar(int ch) { // Legacy word characters if (ch == '_') return true; if (ch < '0') return false; if (ch > 'z') return false; if (ch <= '9') return true; if (ch < 'A') return false; if (ch <= 'Z') return true; if (ch < 'a') return false; return true; } private static final boolean matchIgnoreCase(int chardata, int ch) { if (chardata == ch) return true; if (chardata > 0xffff || ch > 0xffff) return false; char uch1 = Character.toUpperCase((char)chardata); char uch2 = Character.toUpperCase((char)ch); if (uch1 == uch2) return true; return Character.toLowerCase(uch1) == Character.toLowerCase(uch2); } }
⏎ org/apache/xerces/impl/xpath/regex/RegularExpression.java
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