Move a generic string utility to StringUtils

Change-Id: I9cc2e9a7ac0b3346af40bcb083f939333336cf09

1 files changed, 31 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/StringUtils.java b/java/src/com/android/inputmethod/latin/StringUtils.java
index 90c3fcdd2..dcb514a5e 100644
--- a/java/src/com/android/inputmethod/latin/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/StringUtils.java
@@ -22,6 +22,10 @@ import java.util.ArrayList;
 import java.util.Locale;
 
 public final class StringUtils {
+    public static final int CAPITALIZE_NONE = 0;  // No caps, or mixed case
+    public static final int CAPITALIZE_FIRST = 1; // First only
+    public static final int CAPITALIZE_ALL = 2;   // All caps
+
     private StringUtils() {
         // This utility class is not publicly instantiable.
     }
@@ -171,4 +175,31 @@ public final class StringUtils {
         }
         return list.toArray(new String[list.size()]);
     }
+
+    // This method assumes the text is not empty or null.
+    public static int getCapitalizationType(final String text) {
+        // If the first char is not uppercase, then the word is either all lower case or
+        // camel case, and in either case we return CAPITALIZE_NONE.
+        if (!Character.isUpperCase(text.codePointAt(0))) return CAPITALIZE_NONE;
+        final int len = text.length();
+        int capsCount = 1;
+        int letterCount = 1;
+        for (int i = 1; i < len; i = text.offsetByCodePoints(i, 1)) {
+            if (1 != capsCount && letterCount != capsCount) break;
+            final int codePoint = text.codePointAt(i);
+            if (Character.isUpperCase(codePoint)) {
+                ++capsCount;
+                ++letterCount;
+            } else if (Character.isLetter(codePoint)) {
+                // We need to discount non-letters since they may not be upper-case, but may
+                // still be part of a word (e.g. single quote or dash, as in "IT'S" or "FULL-TIME")
+                ++letterCount;
+            }
+        }
+        // We know the first char is upper case. So we want to test if either every letter other
+        // than the first is lower case, or if they are all upper case. If the string is exactly
+        // one char long, then we will arrive here with letterCount 1, and this is correct, too.
+        if (1 == capsCount) return CAPITALIZE_FIRST;
+        return (letterCount == capsCount ? CAPITALIZE_ALL : CAPITALIZE_NONE);
+    }
 }