+++ /dev/null
-/*
- * gnu/regexp/REMatch.java
- * Copyright (C) 1998-2001 Wes Biggs
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 2.1 of the License, or
- * (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-package gnu.regexp;
-import java.io.Serializable;
-
-/**
- * An instance of this class represents a match
- * completed by a gnu.regexp matching function. It can be used
- * to obtain relevant information about the location of a match
- * or submatch.
- *
- * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
- */
-public final class REMatch implements Serializable, Cloneable {
- private String matchedText;
-
- // These variables are package scope for fast access within the engine
- int eflags; // execution flags this match was made using
-
- // Offset in source text where match was tried. This is zero-based;
- // the actual position in the source text is given by (offset + anchor).
- int offset;
-
- // Anchor position refers to the index into the source input
- // at which the matching operation began.
- // This is also useful for the ANCHORINDEX option.
- int anchor;
-
- // Package scope; used by RE.
- int index; // used while matching to mark current match position in input
- int[] start; // start positions (relative to offset) for each (sub)exp.
- int[] end; // end positions for the same
- REMatch next; // other possibility (to avoid having to use arrays)
-
- public Object clone() {
- try {
- REMatch copy = (REMatch) super.clone();
- copy.next = null;
-
- copy.start = (int[]) start.clone();
- copy.end = (int[]) end.clone();
-
- return copy;
- } catch (CloneNotSupportedException e) {
- throw new Error(); // doesn't happen
- }
- }
-
- void assignFrom(REMatch other) {
- start = other.start;
- end = other.end;
- index = other.index;
- // need to deep clone?
- next = other.next;
- }
-
- REMatch(int subs, int anchor, int eflags) {
- start = new int[subs+1];
- end = new int[subs+1];
- this.anchor = anchor;
- this.eflags = eflags;
- clear(anchor);
- }
-
- void finish(CharIndexed text) {
- start[0] = 0;
- StringBuffer sb = new StringBuffer();
- int i;
- for (i = 0; i < end[0]; i++)
- sb.append(text.charAt(i));
- matchedText = sb.toString();
- for (i = 0; i < start.length; i++) {
- // If any subexpressions didn't terminate, they don't count
- // TODO check if this code ever gets hit
- if ((start[i] == -1) ^ (end[i] == -1)) {
- start[i] = -1;
- end[i] = -1;
- }
- }
- next = null; // cut off alternates
- }
-
- /** Clears the current match and moves the offset to the new index. */
- void clear(int index) {
- offset = index;
- this.index = 0;
- for (int i = 0; i < start.length; i++) {
- start[i] = end[i] = -1;
- }
- next = null; // cut off alternates
- }
-
- /**
- * Returns the string matching the pattern. This makes it convenient
- * to write code like the following:
- * <P>
- * <code>
- * REMatch myMatch = myExpression.getMatch(myString);<br>
- * if (myMatch != null) System.out.println("Regexp found: "+myMatch);
- * </code>
- */
- public String toString() {
- return matchedText;
- }
-
- /**
- * Returns the index within the input text where the match in its entirety
- * began.
- */
- public int getStartIndex() {
- return offset + start[0];
- }
-
- /**
- * Returns the index within the input string where the match in
- * its entirety ends. The return value is the next position after
- * the end of the string; therefore, a match created by the
- * following call:
- *
- * <P>
- * <code>REMatch myMatch = myExpression.getMatch(myString);</code>
- * <P>
- * can be viewed (given that myMatch is not null) by creating
- * <P>
- * <code>String theMatch = myString.substring(myMatch.getStartIndex(),
- * myMatch.getEndIndex());</code>
- * <P>
- * But you can save yourself that work, since the <code>toString()</code>
- * method (above) does exactly that for you.
- */
- public int getEndIndex() {
- return offset + end[0];
- }
-
- /**
- * Returns the string matching the given subexpression. The subexpressions
- * are indexed starting with one, not zero. That is, the subexpression
- * identified by the first set of parentheses in a regular expression
- * could be retrieved from an REMatch by calling match.toString(1).
- *
- * @param sub Index of the subexpression.
- */
- public String toString(int sub) {
- if ((sub >= start.length) || (start[sub] == -1)) return "";
- return (matchedText.substring(start[sub],end[sub]));
- }
-
- /**
- * Returns the index within the input string used to generate this match
- * where subexpression number <i>sub</i> begins, or <code>-1</code> if
- * the subexpression does not exist. The initial position is zero.
- *
- * @param sub Subexpression index
- * @deprecated Use getStartIndex(int) instead.
- */
- public int getSubStartIndex(int sub) {
- if (sub >= start.length) return -1;
- int x = start[sub];
- return (x == -1) ? x : offset + x;
- }
-
- /**
- * Returns the index within the input string used to generate this match
- * where subexpression number <i>sub</i> begins, or <code>-1</code> if
- * the subexpression does not exist. The initial position is zero.
- *
- * @param sub Subexpression index
- * @since gnu.regexp 1.1.0
- */
- public int getStartIndex(int sub) {
- if (sub >= start.length) return -1;
- int x = start[sub];
- return (x == -1) ? x : offset + x;
- }
-
- /**
- * Returns the index within the input string used to generate this match
- * where subexpression number <i>sub</i> ends, or <code>-1</code> if
- * the subexpression does not exist. The initial position is zero.
- *
- * @param sub Subexpression index
- * @deprecated Use getEndIndex(int) instead
- */
- public int getSubEndIndex(int sub) {
- if (sub >= start.length) return -1;
- int x = end[sub];
- return (x == -1) ? x : offset + x;
- }
-
- /**
- * Returns the index within the input string used to generate this match
- * where subexpression number <i>sub</i> ends, or <code>-1</code> if
- * the subexpression does not exist. The initial position is zero.
- *
- * @param sub Subexpression index
- */
- public int getEndIndex(int sub) {
- if (sub >= start.length) return -1;
- int x = end[sub];
- return (x == -1) ? x : offset + x;
- }
-
- /**
- * Substitute the results of this match to create a new string.
- * This is patterned after PERL, so the tokens to watch out for are
- * <code>$0</code> through <code>$9</code>. <code>$0</code> matches
- * the full substring matched; <code>$<i>n</i></code> matches
- * subexpression number <i>n</i>.
- *
- * @param input A string consisting of literals and <code>$<i>n</i></code> tokens.
- */
- public String substituteInto(String input) {
- // a la Perl, $0 is whole thing, $1 - $9 are subexpressions
- StringBuffer output = new StringBuffer();
- int pos;
- for (pos = 0; pos < input.length()-1; pos++) {
- if ((input.charAt(pos) == '$') && (Character.isDigit(input.charAt(pos+1)))) {
- int val = Character.digit(input.charAt(++pos),10);
- if (val < start.length) {
- output.append(toString(val));
- }
- } else output.append(input.charAt(pos));
- }
- if (pos < input.length()) output.append(input.charAt(pos));
- return output.toString();
- }
-}
projects / org.ibex.core.git / blobdiff