1 files changed, 44 insertions, 6 deletions

diff --git a/java/src/com/android/inputmethod/event/CombinerChain.java b/java/src/com/android/inputmethod/event/CombinerChain.java
index 8b59dc52a..61bc11b39 100644
--- a/java/src/com/android/inputmethod/event/CombinerChain.java
+++ b/java/src/com/android/inputmethod/event/CombinerChain.java
@@ -20,9 +20,9 @@ import android.text.SpannableStringBuilder;
 import android.text.TextUtils;
 
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.utils.CollectionUtils;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 
 /**
  * This class implements the logic chain between receiving events and generating code points.
@@ -43,20 +43,32 @@ public class CombinerChain {
     private SpannableStringBuilder mStateFeedback;
     private final ArrayList<Combiner> mCombiners;
 
+    private static final HashMap<String, Class<? extends Combiner>> IMPLEMENTED_COMBINERS =
+            new HashMap<>();
+    static {
+        IMPLEMENTED_COMBINERS.put("MyanmarReordering", MyanmarReordering.class);
+    }
+    private static final String COMBINER_SPEC_SEPARATOR = ";";
+
     /**
      * Create an combiner chain.
      *
      * The combiner chain takes events as inputs and outputs code points and combining state.
      * For example, if the input language is Japanese, the combining chain will typically perform
-     * kana conversion.
+     * kana conversion. This takes a string for initial text, taken to be present before the
+     * cursor: we'll start after this.
      *
+     * @param initialText The text that has already been combined so far.
      * @param combinerList A list of combiners to be applied in order.
      */
-    public CombinerChain(final Combiner... combinerList) {
-        mCombiners = CollectionUtils.newArrayList();
+    public CombinerChain(final String initialText, final Combiner... combinerList) {
+        mCombiners = new ArrayList<>();
         // The dead key combiner is always active, and always first
         mCombiners.add(new DeadKeyCombiner());
-        mCombinedText = new StringBuilder();
+        for (final Combiner combiner : combinerList) {
+            mCombiners.add(combiner);
+        }
+        mCombinedText = new StringBuilder(initialText);
         mStateFeedback = new SpannableStringBuilder();
     }
 
@@ -74,7 +86,7 @@ public class CombinerChain {
      * @param newEvent the new event to process
      */
     public void processEvent(final ArrayList<Event> previousEvents, final Event newEvent) {
-        final ArrayList<Event> modifiablePreviousEvents = new ArrayList<Event>(previousEvents);
+        final ArrayList<Event> modifiablePreviousEvents = new ArrayList<>(previousEvents);
         Event event = newEvent;
         for (final Combiner combiner : mCombiners) {
             // A combiner can never return more than one event; it can return several
@@ -114,4 +126,30 @@ public class CombinerChain {
         final SpannableStringBuilder s = new SpannableStringBuilder(mCombinedText);
         return s.append(mStateFeedback);
     }
+
+    public static Combiner[] createCombiners(final String spec) {
+        if (TextUtils.isEmpty(spec)) {
+            return new Combiner[0];
+        }
+        final String[] combinerDescriptors = spec.split(COMBINER_SPEC_SEPARATOR);
+        final Combiner[] combiners = new Combiner[combinerDescriptors.length];
+        int i = 0;
+        for (final String combinerDescriptor : combinerDescriptors) {
+            final Class<? extends Combiner> combinerClass =
+                    IMPLEMENTED_COMBINERS.get(combinerDescriptor);
+            if (null == combinerClass) {
+                throw new RuntimeException("Unknown combiner descriptor: " + combinerDescriptor);
+            }
+            try {
+                combiners[i++] = combinerClass.newInstance();
+            } catch (InstantiationException e) {
+                throw new RuntimeException("Unable to instantiate combiner: " + combinerDescriptor,
+                        e);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException("Unable to instantiate combiner: " + combinerDescriptor,
+                        e);
+            }
+        }
+        return combiners;
+    }
 }