Implementing Java camelCase breaking in SCL module editor

[simantics/platform.git] / bundles / org.simantics.scl.ui / src / org / simantics / scl / ui / editor2 / iterator / SequenceCharacterIterator.java

diff --git a/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor2/iterator/SequenceCharacterIterator.java b/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor2/iterator/SequenceCharacterIterator.java
new file mode 100644 (file)
index 0000000..96520a3
--- /dev/null
+++ b/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor2/iterator/SequenceCharacterIterator.java
@@ -0,0 +1,158 @@
+package org.simantics.scl.ui.editor2.iterator;
+
+import java.text.CharacterIterator;
+
+import org.eclipse.core.runtime.Assert;
+
+
+
+/**
+ * A <code>CharSequence</code> based implementation of <code>CharacterIterator</code>.
+ *
+ * @since 3.0
+ */
+public class SequenceCharacterIterator implements CharacterIterator {
+
+       private int fIndex= -1;
+       private final CharSequence fSequence;
+       private final int fFirst;
+       private final int fLast;
+
+       private void invariant() {
+               Assert.isTrue(fIndex >= fFirst);
+               Assert.isTrue(fIndex <= fLast);
+       }
+
+       /**
+        * Creates an iterator for the entire sequence.
+        *
+        * @param sequence the sequence backing this iterator
+        */
+       public SequenceCharacterIterator(CharSequence sequence) {
+               this(sequence, 0);
+       }
+
+       /**
+        * Creates an iterator.
+        *
+        * @param sequence the sequence backing this iterator
+        * @param first the first character to consider
+        * @throws IllegalArgumentException if the indices are out of bounds
+        */
+       public SequenceCharacterIterator(CharSequence sequence, int first) throws IllegalArgumentException {
+               this(sequence, first, sequence.length());
+       }
+
+       /**
+        * Creates an iterator.
+        *
+        * @param sequence the sequence backing this iterator
+        * @param first the first character to consider
+        * @param last the last character index to consider
+        * @throws IllegalArgumentException if the indices are out of bounds
+        */
+       public SequenceCharacterIterator(CharSequence sequence, int first, int last) throws IllegalArgumentException {
+               if (sequence == null)
+                       throw new NullPointerException();
+               if (first < 0 || first > last)
+                       throw new IllegalArgumentException();
+               if (last > sequence.length())
+                       throw new IllegalArgumentException();
+               fSequence= sequence;
+               fFirst= first;
+               fLast= last;
+               fIndex= first;
+               invariant();
+       }
+
+       /*
+        * @see java.text.CharacterIterator#first()
+        */
+       public char first() {
+               return setIndex(getBeginIndex());
+       }
+
+       /*
+        * @see java.text.CharacterIterator#last()
+        */
+       public char last() {
+               if (fFirst == fLast)
+                       return setIndex(getEndIndex());
+               else
+                       return setIndex(getEndIndex() - 1);
+       }
+
+       /*
+        * @see java.text.CharacterIterator#current()
+        */
+       public char current() {
+               if (fIndex >= fFirst && fIndex < fLast)
+                       return fSequence.charAt(fIndex);
+               else
+                       return DONE;
+       }
+
+       /*
+        * @see java.text.CharacterIterator#next()
+        */
+       public char next() {
+               return setIndex(Math.min(fIndex + 1, getEndIndex()));
+       }
+
+       /*
+        * @see java.text.CharacterIterator#previous()
+        */
+       public char previous() {
+               if (fIndex > getBeginIndex()) {
+                       return setIndex(fIndex - 1);
+               } else {
+                       return DONE;
+               }
+       }
+
+       /*
+        * @see java.text.CharacterIterator#setIndex(int)
+        */
+       public char setIndex(int position) {
+               if (position >= getBeginIndex() && position <= getEndIndex())
+                       fIndex= position;
+               else
+                       throw new IllegalArgumentException();
+
+               invariant();
+               return current();
+       }
+
+       /*
+        * @see java.text.CharacterIterator#getBeginIndex()
+        */
+       public int getBeginIndex() {
+               return fFirst;
+       }
+
+       /*
+        * @see java.text.CharacterIterator#getEndIndex()
+        */
+       public int getEndIndex() {
+               return fLast;
+       }
+
+       /*
+        * @see java.text.CharacterIterator#getIndex()
+        */
+       public int getIndex() {
+               return fIndex;
+       }
+
+       /*
+        * @see java.text.CharacterIterator#clone()
+        */
+       @Override
+       public Object clone() {
+               try {
+                       return super.clone();
+               } catch (CloneNotSupportedException e) {
+                       throw new InternalError();
+               }
+       }
+}