X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fcom%2Fstevesoft%2Fpat%2FPattern.java;h=543391e90be7c6476b67b53697ffd18ec20ed5ff;hb=26e4caf025740afea870ed6ceb5894bc56316ba6;hp=404991cf1f53cf78f205f1b93d82e843ebf973b3;hpb=c40cf903f740a72ab63dd1abc10fa33450ce660d;p=jalview.git
diff --git a/src/com/stevesoft/pat/Pattern.java b/src/com/stevesoft/pat/Pattern.java
index 404991c..543391e 100755
--- a/src/com/stevesoft/pat/Pattern.java
+++ b/src/com/stevesoft/pat/Pattern.java
@@ -1,193 +1,294 @@
-//
-// This software is now distributed according to
-// the Lesser Gnu Public License. Please see
-// http://www.gnu.org/copyleft/lesser.txt for
-// the details.
-// -- Happy Computing!
-//
-package com.stevesoft.pat;
-import java.util.*;
-/**
- Shareware: package pat
- Copyright 2001, Steven R. Brandt
-*/ /**
-Class Pattern is the base class on which all the other pattern
-elements are built. */
-
-public abstract class Pattern {
- /** The ESC character, the user can provide his own value
- for the escape character through regex.esc */
- public final static char ESC = '\\';
- final static String PROTECT_THESE = "[]{}(),$,-\"^.";
-
- /** The interal match function, it must be provided by any
- class which wishes to extend Pattern. */
- public abstract int matchInternal(int i,Pthings p);
- public abstract String toString();
-
- // Class Pattern is a singly linked list
- // chained together by member next. The member
- // parent is used so that sub patterns can access
- // the chain they are branching from.
- Pattern next=null,parent=null;
-
- /** This gets the next element of a Pattern that
- we wish to match. If we are at the end of a
- subchain of patterns, it will return us to the
- parent chain. */
- public Pattern getNext() {
- return next != null ? next :
- (parent == null ? null : parent.getNext());
- }
- /** Call this method if you have a pattern element that
- takes a sub pattern (such as Or), and
- after you have added a sub pattern to the current
- pattern element. */
- public void setParent(Pattern p) {
- if(next != null) next.setParent(p);
- else parent = p;
- }
- /** This determines if the remainder of a Pattern
- matches. Type "return nextMatch" from within
- matchInternal if the current
- Pattern matches. Otherwise, return a -1.*/
- public int nextMatch(int i,Pthings pt) {
- Pattern p = getNext();
- /*if(p == null) return i;
- return p.matchInternal(i,pt);*/
- return p==null ? i : p.matchInternal(i,pt);
- }
- /** This is a toString() for the remainder
- of the Pattern elements after this one.
- use this when overriding toString(). Called from
- within toString(). */
- public String nextString() {
- if(next == null) return "";
- return next.toString();
- }
-
- /** a method to detect whether char c is in String s */
- final static boolean inString(char c,String s) {
- int i;
- for(i=0;iCopyright 2001, Steven R. Brandt
+ */
+/**
+ * Class Pattern is the base class on which all the other pattern elements are
+ * built.
+ */
+
+public abstract class Pattern
+{
+ /**
+ * The ESC character, the user can provide his own value for the escape
+ * character through regex.esc
+ */
+ public final static char ESC = '\\';
+
+ final static String PROTECT_THESE = "[]{}(),$,-\"^.";
+
+ /**
+ * The interal match function, it must be provided by any class which wishes
+ * to extend Pattern.
+ */
+ public abstract int matchInternal(int i, Pthings p);
+
+ public abstract String toString();
+
+ // Class Pattern is a singly linked list
+ // chained together by member next. The member
+ // parent is used so that sub patterns can access
+ // the chain they are branching from.
+ Pattern next = null, parent = null;
+
+ /**
+ * This gets the next element of a Pattern that we wish to match. If we are at
+ * the end of a subchain of patterns, it will return us to the parent chain.
+ */
+ public Pattern getNext()
+ {
+ return next != null ? next : (parent == null ? null : parent.getNext());
+ }
+
+ /**
+ * Call this method if you have a pattern element that takes a sub pattern
+ * (such as Or), and after you have added a sub pattern to the current pattern
+ * element.
+ */
+ public void setParent(Pattern p)
+ {
+ if (next != null)
+ {
+ next.setParent(p);
+ }
+ else
+ {
+ parent = p;
+ }
+ }
+
+ /**
+ * This determines if the remainder of a Pattern matches. Type "return
+ * nextMatch" from within matchInternal if the current Pattern matches.
+ * Otherwise, return a -1.
+ */
+ public int nextMatch(int i, Pthings pt)
+ {
+ Pattern p = getNext();
+ /*
+ * if(p == null) return i; return p.matchInternal(i,pt);
+ */
+ return p == null ? i : p.matchInternal(i, pt);
+ }
+
+ /**
+ * This is a toString() for the remainder of the Pattern elements after this
+ * one. use this when overriding toString(). Called from within toString().
+ */
+ public String nextString()
+ {
+ if (next == null)
+ {
+ return "";
+ }
+ return next.toString();
+ }
+
+ /** a method to detect whether char c is in String s */
+ final static boolean inString(char c, String s)
+ {
+ int i;
+ for (i = 0; i < s.length(); i++)
+ {
+ if (s.charAt(i) == c)
+ {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * A method to create a string that protects the characters listed in
+ * PROTECT_THESE by prepending the esc character. The esc character itself is
+ * automatically protected.
+ */
+ final static String protect(String s, String PROTECT_THESE, char esc)
+ {
+ int i;
+ StringBuffer sb = new StringBuffer();
+ String p = PROTECT_THESE + esc;
+ for (i = 0; i < s.length(); i++)
+ {
+ char c = s.charAt(i);
+ if (inString(c, p))
+ {
+ sb.append(esc);
+ }
+ sb.append(c);
+ }
+ return sb.toString();
+ }
+
+ /**
+ * This can be used to perform a match test from within class Pattern.
+ */
+ public int match(StringLike s, Pthings pt)
+ {
+ return matchAt(s, 0, pt);
+ }
+
+ /**
+ * This can be used to perform a match test from within class Pattern.
+ */
+ public int matchAt(StringLike s, int i, Pthings pt)
+ {
+ pt.src = s;
+ int r = matchInternal(i, pt);
+ if (r < 0)
+ {
+ return -1;
+ }
+ mfrom = r < i ? r + 1 : i;
+ return r < i ? i - r - 1 : r - i;
+ }
+
+ int mfrom = 0;
+
+ // Detect masked characters
+ final boolean Masked(int i, Pthings pt)
+ {
+ return pt.cbits == null ? false : pt.cbits.get(i);
+ }
+
+ /** add a Pattern to the singly-linked Pattern chain. */
+ public Pattern add(Pattern p)
+ {
+ if (next == null)
+ {
+ if (p == null)
+ {
+ return this;
+ }
+ next = p;
+ p.parent = parent;
+ parent = null;
+ }
+ else
+ {
+ next.add(p);
+ }
+ return this;
+ }
+
+ /**
+ * The minimum number of characters which this pattern element can match.
+ */
+ public patInt minChars()
+ {
+ return new patInt(0);
+ }
+
+ /**
+ * The maximum number of characters which this pattern element can match.
+ */
+ public patInt maxChars()
+ {
+ return new patInf();
+ }
+
+ /** return minimum number of characters in pattern */
+ public final patInt countMinChars()
+ {
+ Pattern p = this;
+ patInt sum = new patInt(0);
+ while (p != null)
+ {
+ sum.pluseq(p.minChars());
+ p = p.next;
+ }
+ return sum;
+ }
+
+ /** return maximum number of characters in pattern */
+ public final patInt countMaxChars()
+ {
+ Pattern p = this;
+ patInt sum = new patInt(0);
+ while (p != null)
+ {
+ sum.pluseq(p.maxChars());
+ p = p.next;
+ }
+ return sum;
+ }
+
+ // This method is only needed by Multi_stage2 so far...
+ // the reason is that it may try something else after a
+ // match succeeds. OrMark will only record the last thing
+ // tried in marks, so we need to backup the result of the
+ // last successful match and restore it if the next one
+ // does not succeed.
+ final int testMatch(Pattern p, int pos, Pthings pt)
+ {
+ int[] tab = null;
+ if (pt.marks != null)
+ {
+ try
+ {
+ tab = new int[pt.marks.length];
+ for (int i = 0; i < tab.length; i++)
+ {
+ tab[i] = pt.marks[i];
+ }
+ } catch (Throwable t)
+ {
+ }
+ }
+ int ret = p.matchInternal(pos, pt);
+ if (ret < 0)
+ {
+ pt.marks = tab;
+ }
+ return ret;
+ }
+
+ /**
+ * Clones this pattern elements without cloning others in the linked list.
+ */
+ Pattern clone1(Hashtable h)
+ {
+ throw new Error("No such method as clone1 for " + getClass().getName());
+ }
+
+ Pattern clone(Hashtable h)
+ {
+ Pattern p = (Pattern) h.get(this);
+ if (p != null)
+ {
+ return p;
+ }
+ p = clone1(h);
+ if (p == null)
+ {
+ throw new Error("Null from clone1!");
+ }
+ h.put(this, p);
+ h.put(p, p);
+ if (next != null)
+ {
+ p.next = next.clone(h);
+ }
+ if (parent != null)
+ {
+ p.parent = parent.clone(h);
+ }
+ return p;
+ }
+
+ public boolean equals(Object o)
+ {
+ return o == this;
+ }
+};