toString methods for tokens; log E-20609

xml/impl/src/com/intellij/codeInsight/template/zencoding/FilterToken.java

@@ -28,4 +28,9 @@ public class FilterToken extends Token {
   public String getSuffix() {
     return mySuffix;
   }
+
+  @Override
+  public String toString() {
+    return "|" + mySuffix;
+  }
 }

xml/impl/src/com/intellij/codeInsight/template/zencoding/MarkerToken.java

@@ -19,4 +19,8 @@ package com.intellij.codeInsight.template.zencoding;
  * @author Eugene.Kudelevsky
  */
 class MarkerToken extends Token {
+  @Override
+  public String toString() {
+    return "&";
+  }
 }

xml/impl/src/com/intellij/codeInsight/template/zencoding/NumberToken.java

@@ -28,4 +28,9 @@ class NumberToken extends Token {
   public int getNumber() {
     return myNumber;
   }
+
+  @Override
+  public String toString() {
+    return Integer.toString(myNumber);
+  }
 }

xml/impl/src/com/intellij/codeInsight/template/zencoding/OperationToken.java

@@ -28,4 +28,9 @@ class OperationToken extends Token {
   public char getSign() {
     return mySign;
   }
+
+  @Override
+  public String toString() {
+    return Character.toString(mySign);
+  }
 }

xml/impl/src/com/intellij/codeInsight/template/zencoding/TemplateToken.java

@@ -39,4 +39,9 @@ public class TemplateToken extends Token {
   public TemplateImpl getTemplate() {
     return myTemplate;
   }
+
+  @Override
+  public String toString() {
+    return "TEMPLATE";
+  }
 }

xml/impl/src/com/intellij/codeInsight/template/zencoding/XmlZenCodingInterpreter.java

@@ -372,7 +372,7 @@ class XmlZenCodingInterpreter {
     return new XmlZenCodingFilterImpl().toString(tag, context);
   }
 
-  private static void fail() {
-    LOG.error("Input string was checked incorrectly during isApplicable() invokation");
+  private void fail() {
+    LOG.error("Input string was checked incorrectly during isApplicable() invokation: " + myTokens.toString());
   }
 }