needed for applet search

[jalview.git] / src / com / stevesoft / pat / Boundary.java

diff --git a/src/com/stevesoft/pat/Boundary.java b/src/com/stevesoft/pat/Boundary.java
new file mode 100755 (executable)
index 0000000..959bb04
--- /dev/null
+++ b/src/com/stevesoft/pat/Boundary.java
@@ -0,0 +1,51 @@
+//\r
+// This software is now distributed according to\r
+// the Lesser Gnu Public License.  Please see\r
+// http://www.gnu.org/copyleft/lesser.txt for\r
+// the details.\r
+//    -- Happy Computing!\r
+//\r
+package com.stevesoft.pat;\r
+import java.util.Hashtable;\r
+\r
+/** This class implements the word boundary pattern element: \b. */\r
+class Boundary extends Pattern {\r
+    public String toString() {\r
+        return "\\b"+nextString();\r
+    }\r
+    boolean isAChar(char c) {\r
+        if(c >= 'a' && c <= 'z')\r
+            return true;\r
+        if(c >= 'A' && c <= 'Z')\r
+            return true;\r
+        if(c >= '0' && c <= '9')\r
+            return true;\r
+        if(c == '_')\r
+            return true;\r
+        return false;\r
+    }\r
+    boolean matchLeft(int pos,Pthings pt) {\r
+        if(pos <= 0)\r
+            return true;\r
+        if(isAChar(pt.src.charAt(pos))\r
+                && isAChar(pt.src.charAt(pos-1)))\r
+            return false;\r
+        return true;\r
+    }\r
+    boolean matchRight(int pos,Pthings pt) {\r
+        if(pos < 0) return false;\r
+        if(pos+1 >= pt.src.length())\r
+            return true;\r
+        if(isAChar(pt.src.charAt(pos))\r
+                && isAChar(pt.src.charAt(pos+1)))\r
+            return false;\r
+        return true;\r
+    }\r
+    public int matchInternal(int pos,Pthings pt) {\r
+        if(matchRight(pos-1,pt) || matchLeft(pos,pt))\r
+            return nextMatch(pos,pt);\r
+        return -1;\r
+    }\r
+    public patInt maxChars() { return new patInt(0); }\r
+    public Pattern clone1(Hashtable h) { return new Boundary(); }\r
+};\r