--- /dev/null
+package net.sourceforge.phpdt.internal.ui.util;
+
+import java.util.Vector;
+
+/**
+ * A string pattern matcher, suppporting * and ? wildcards.
+ */
+public class StringMatcher {
+ protected String fPattern;
+
+ protected int fLength; // pattern length
+
+ protected boolean fIgnoreWildCards;
+
+ protected boolean fIgnoreCase;
+
+ protected boolean fHasLeadingStar;
+
+ protected boolean fHasTrailingStar;
+
+ protected String fSegments[]; // the given pattern is split into *
+ // separated segments
+
+ /* boundary value beyond which we don't need to search in the text */
+ protected int fBound = 0;
+
+ protected static final char fSingleWildCard = '\u0000';
+
+ public static class Position {
+ int start; // inclusive
+
+ int end; // exclusive
+
+ public Position(int start, int end) {
+ this.start = start;
+ this.end = end;
+ }
+
+ public int getStart() {
+ return start;
+ }
+
+ public int getEnd() {
+ return end;
+ }
+ }
+
+ /**
+ * StringMatcher constructor takes in a String object that is a simple
+ * pattern which may contain �*� for 0 and many characters and �?� for
+ * exactly one character.
+ *
+ * Literal '*' and '?' characters must be escaped in the pattern e.g., "\*"
+ * means literal "*", etc.
+ *
+ * Escaping any other character (including the escape character itself),
+ * just results in that character in the pattern. e.g., "\a" means "a" and
+ * "\\" means "\"
+ *
+ * If invoking the StringMatcher with string literals in Java, don't forget
+ * escape characters are represented by "\\".
+ *
+ * @param pattern
+ * the pattern to match text against
+ * @param ignoreCase
+ * if true, case is ignored
+ * @param ignoreWildCards
+ * if true, wild cards and their escape sequences are ignored
+ * (everything is taken literally).
+ */
+ public StringMatcher(String pattern, boolean ignoreCase,
+ boolean ignoreWildCards) {
+ if (pattern == null)
+ throw new IllegalArgumentException();
+ fIgnoreCase = ignoreCase;
+ fIgnoreWildCards = ignoreWildCards;
+ fPattern = pattern;
+ fLength = pattern.length();
+
+ if (fIgnoreWildCards) {
+ parseNoWildCards();
+ } else {
+ parseWildCards();
+ }
+ }
+
+ /**
+ * Find the first occurrence of the pattern between
+ * <code>start</code)(inclusive)
+ * and <code>end</code>(exclusive).
+ * @param <code>text</code>, the String object to search in
+ * @param <code>start</code>, the starting index of the search range, inclusive
+ * @param <code>end</code>, the ending index of the search range, exclusive
+ * @return an <code>StringMatcher.Position</code> object that keeps the starting
+ * (inclusive) and ending positions (exclusive) of the first occurrence of the
+ * pattern in the specified range of the text; return null if not found or subtext
+ * is empty (start==end). A pair of zeros is returned if pattern is empty string
+ * Note that for pattern like "*abc*" with leading and trailing stars, position of "abc"
+ * is returned. For a pattern like"*??*" in text "abcdf", (1,3) is returned
+ */
+// public StringMatcher.Position find(String text, int start, int end) {
+// if (text == null)
+// throw new IllegalArgumentException();
+//
+// int tlen = text.length();
+// if (start < 0)
+// start = 0;
+// if (end > tlen)
+// end = tlen;
+// if (end < 0 || start >= end)
+// return null;
+// if (fLength == 0)
+// return new Position(start, start);
+// if (fIgnoreWildCards) {
+// int x = posIn(text, start, end);
+// if (x < 0)
+// return null;
+// return new Position(x, x + fLength);
+// }
+//
+// int segCount = fSegments.length;
+// if (segCount == 0)// pattern contains only '*'(s)
+// return new Position(start, end);
+//
+// int curPos = start;
+// int matchStart = -1;
+// int i;
+// for (i = 0; i < segCount && curPos < end; ++i) {
+// String current = fSegments[i];
+// int nextMatch = regExpPosIn(text, curPos, end, current);
+// if (nextMatch < 0)
+// return null;
+// if (i == 0)
+// matchStart = nextMatch;
+// curPos = nextMatch + current.length();
+// }
+// if (i < segCount)
+// return null;
+// return new Position(matchStart, curPos);
+// }
+
+ /**
+ * match the given <code>text</code> with the pattern
+ *
+ * @return true if matched eitherwise false
+ * @param <code>text</code>, a String object
+ */
+ public boolean match(String text) {
+ return match(text, 0, text.length());
+ }
+
+ /**
+ * Given the starting (inclusive) and the ending (exclusive) positions in
+ * the <code>text</code>, determine if the given substring matches with
+ * aPattern
+ *
+ * @return true if the specified portion of the text matches the pattern
+ * @param String
+ * <code>text</code>, a String object that contains the
+ * substring to match
+ * @param int
+ * <code>start<code> marks the starting position (inclusive) of the substring
+ * @param int <code>end<code> marks the ending index (exclusive) of the substring
+ */
+ public boolean match(String text, int start, int end) {
+ if (null == text)
+ throw new IllegalArgumentException();
+
+ if (start > end)
+ return false;
+
+ if (fIgnoreWildCards)
+ return (end - start == fLength)
+ && fPattern.regionMatches(fIgnoreCase, 0, text, start,
+ fLength);
+ int segCount = fSegments.length;
+ if (segCount == 0 && (fHasLeadingStar || fHasTrailingStar)) // pattern
+ // contains
+ // only
+ // '*'(s)
+ return true;
+ if (start == end)
+ return fLength == 0;
+ if (fLength == 0)
+ return start == end;
+
+ int tlen = text.length();
+ if (start < 0)
+ start = 0;
+ if (end > tlen)
+ end = tlen;
+
+ int tCurPos = start;
+ int bound = end - fBound;
+ if (bound < 0)
+ return false;
+ int i = 0;
+ String current = fSegments[i];
+ int segLength = current.length();
+
+ /* process first segment */
+ if (!fHasLeadingStar) {
+ if (!regExpRegionMatches(text, start, current, 0, segLength)) {
+ return false;
+ } else {
+ ++i;
+ tCurPos = tCurPos + segLength;
+ }
+ }
+
+ /* process middle segments */
+ while (i < segCount) {
+ current = fSegments[i];
+ int currentMatch;
+ int k = current.indexOf(fSingleWildCard);
+ if (k < 0) {
+ currentMatch = textPosIn(text, tCurPos, end, current);
+ if (currentMatch < 0)
+ return false;
+ } else {
+ currentMatch = regExpPosIn(text, tCurPos, end, current);
+ if (currentMatch < 0)
+ return false;
+ }
+ tCurPos = currentMatch + current.length();
+ i++;
+ }
+
+ /* process final segment */
+ if (!fHasTrailingStar && tCurPos != end) {
+ int clen = current.length();
+ return regExpRegionMatches(text, end - clen, current, 0, clen);
+ }
+ return i == segCount;
+ }
+
+ /**
+ * This method parses the given pattern into segments seperated by wildcard
+ * '*' characters. Since wildcards are not being used in this case, the
+ * pattern consists of a single segment.
+ */
+ private void parseNoWildCards() {
+ fSegments = new String[1];
+ fSegments[0] = fPattern;
+ fBound = fLength;
+ }
+
+ /**
+ * Parses the given pattern into segments seperated by wildcard '*'
+ * characters.
+ *
+ * @param p,
+ * a String object that is a simple regular expression with �*�
+ * and/or �?�
+ */
+ private void parseWildCards() {
+ if (fPattern.startsWith("*"))//$NON-NLS-1$
+ fHasLeadingStar = true;
+ if (fPattern.endsWith("*")) {//$NON-NLS-1$
+ /* make sure it's not an escaped wildcard */
+ if (fLength > 1 && fPattern.charAt(fLength - 2) != '\\') {
+ fHasTrailingStar = true;
+ }
+ }
+
+ Vector temp = new Vector();
+
+ int pos = 0;
+ StringBuffer buf = new StringBuffer();
+ while (pos < fLength) {
+ char c = fPattern.charAt(pos++);
+ switch (c) {
+ case '\\':
+ if (pos >= fLength) {
+ buf.append(c);
+ } else {
+ char next = fPattern.charAt(pos++);
+ /* if it's an escape sequence */
+ if (next == '*' || next == '?' || next == '\\') {
+ buf.append(next);
+ } else {
+ /* not an escape sequence, just insert literally */
+ buf.append(c);
+ buf.append(next);
+ }
+ }
+ break;
+ case '*':
+ if (buf.length() > 0) {
+ /* new segment */
+ temp.addElement(buf.toString());
+ fBound += buf.length();
+ buf.setLength(0);
+ }
+ break;
+ case '?':
+ /* append special character representing single match wildcard */
+ buf.append(fSingleWildCard);
+ break;
+ default:
+ buf.append(c);
+ }
+ }
+
+ /* add last buffer to segment list */
+ if (buf.length() > 0) {
+ temp.addElement(buf.toString());
+ fBound += buf.length();
+ }
+
+ fSegments = new String[temp.size()];
+ temp.copyInto(fSegments);
+ }
+
+ /**
+ * @param <code>text</code>, a string which contains no wildcard
+ * @param <code>start</code>, the starting index in the text for search,
+ * inclusive
+ * @param <code>end</code>, the stopping point of search, exclusive
+ * @return the starting index in the text of the pattern , or -1 if not
+ * found
+ */
+// protected int posIn(String text, int start, int end) {// no wild card in
+// // pattern
+// int max = end - fLength;
+//
+// if (!fIgnoreCase) {
+// int i = text.indexOf(fPattern, start);
+// if (i == -1 || i > max)
+// return -1;
+// return i;
+// }
+//
+// for (int i = start; i <= max; ++i) {
+// if (text.regionMatches(true, i, fPattern, 0, fLength))
+// return i;
+// }
+//
+// return -1;
+// }
+
+ /**
+ * @param <code>text</code>, a simple regular expression that may only
+ * contain '?'(s)
+ * @param <code>start</code>, the starting index in the text for search,
+ * inclusive
+ * @param <code>end</code>, the stopping point of search, exclusive
+ * @param <code>p</code>, a simple regular expression that may contains '?'
+ * @param <code>caseIgnored</code>, wether the pattern is not casesensitive
+ * @return the starting index in the text of the pattern , or -1 if not
+ * found
+ */
+ private int regExpPosIn(String text, int start, int end, String p) {
+ int plen = p.length();
+
+ int max = end - plen;
+ for (int i = start; i <= max; ++i) {
+ if (regExpRegionMatches(text, i, p, 0, plen))
+ return i;
+ }
+ return -1;
+ }
+
+ /**
+ *
+ * @return boolean
+ * @param <code>text</code>, a String to match
+ * @param <code>start</code>, int that indicates the starting index of
+ * match, inclusive
+ * @param <code>end</code> int that indicates the ending index of match,
+ * exclusive
+ * @param <code>p</code>, String, String, a simple regular expression that
+ * may contain '?'
+ * @param <code>ignoreCase</code>, boolean indicating wether code>p</code>
+ * is case sensitive
+ */
+ private boolean regExpRegionMatches(String text, int tStart, String p,
+ int pStart, int plen) {
+ while (plen-- > 0) {
+ char tchar = text.charAt(tStart++);
+ char pchar = p.charAt(pStart++);
+
+ /* process wild cards */
+ if (!fIgnoreWildCards) {
+ /* skip single wild cards */
+ if (pchar == fSingleWildCard) {
+ continue;
+ }
+ }
+ if (pchar == tchar)
+ continue;
+ if (fIgnoreCase) {
+ if (Character.toUpperCase(tchar) == Character
+ .toUpperCase(pchar))
+ continue;
+ // comparing after converting to upper case doesn't handle all
+ // cases;
+ // also compare after converting to lower case
+ if (Character.toLowerCase(tchar) == Character
+ .toLowerCase(pchar))
+ continue;
+ }
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * @param <code>text</code>, the string to match
+ * @param <code>start</code>, the starting index in the text for search,
+ * inclusive
+ * @param <code>end</code>, the stopping point of search, exclusive
+ * @param code>p
+ * </code>, a string that has no wildcard
+ * @param <code>
+ * ignoreCase</code>, boolean indicating wether code>p</code>
+ * is case sensitive
+ * @return the starting index in the text of the pattern , or -1 if not
+ * found
+ */
+ private int textPosIn(String text, int start, int end, String p) {
+
+ int plen = p.length();
+ int max = end - plen;
+
+ if (!fIgnoreCase) {
+ int i = text.indexOf(p, start);
+ if (i == -1 || i > max)
+ return -1;
+ return i;
+ }
+
+ for (int i = start; i <= max; ++i) {
+ if (text.regionMatches(true, i, p, 0, plen))
+ return i;
+ }
+
+ return -1;
+ }
+}
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