Cherry-pick: ticket:12031: StandardPlural from UnicodeString

http://bugs.icu-project.org/trac/changeset/38134

Change-Id: I78ae7f07c4320c150521262a937edd440748e435

2 files changed, 81 insertions, 1 deletions

diff --git a/icu4c/source/i18n/standardplural.cpp b/icu4c/source/i18n/standardplural.cpp
index 651a9bcc3..34127a42c 100644
--- a/icu4c/source/i18n/standardplural.cpp
+++ b/icu4c/source/i18n/standardplural.cpp
@@ -13,6 +13,7 @@
 
 #if !UCONFIG_NO_FORMATTING
 
+#include "unicode/unistr.h"
 #include "cstring.h"
 #include "standardplural.h"
 #include "uassert.h"
@@ -63,6 +64,42 @@ int32_t StandardPlural::indexOrNegativeFromString(const char *keyword) {
     return -1;
 }
 
+static const UChar gZero[] = { 0x7A, 0x65, 0x72, 0x6F };
+static const UChar gOne[] = { 0x6F, 0x6E, 0x65 };
+static const UChar gTwo[] = { 0x74, 0x77, 0x6F };
+static const UChar gFew[] = { 0x66, 0x65, 0x77 };
+static const UChar gMany[] = { 0x6D, 0x61, 0x6E, 0x79 };
+static const UChar gOther[] = { 0x6F, 0x74, 0x68, 0x65, 0x72 };
+
+int32_t StandardPlural::indexOrNegativeFromString(const UnicodeString &keyword) {
+    switch (keyword.length()) {
+    case 3:
+        if (keyword.compare(gOne, 3) == 0) {
+            return ONE;
+        } else if (keyword.compare(gTwo, 3) == 0) {
+            return TWO;
+        } else if (keyword.compare(gFew, 3) == 0) {
+            return FEW;
+        }
+        break;
+    case 4:
+        if (keyword.compare(gMany, 4) == 0) {
+            return MANY;
+        } else if (keyword.compare(gZero, 4) == 0) {
+            return ZERO;
+        }
+        break;
+    case 5:
+        if (keyword.compare(gOther, 5) == 0) {
+            return OTHER;
+        }
+        break;
+    default:
+        break;
+    }
+    return -1;
+}
+
 int32_t StandardPlural::indexFromString(const char *keyword, UErrorCode &errorCode) {
     if (U_FAILURE(errorCode)) { return OTHER; }
     int32_t i = indexOrNegativeFromString(keyword);
diff --git a/icu4c/source/i18n/standardplural.h b/icu4c/source/i18n/standardplural.h
index 174f2a4a4..8a8de2188 100644
--- a/icu4c/source/i18n/standardplural.h
+++ b/icu4c/source/i18n/standardplural.h
@@ -18,6 +18,8 @@
 
 U_NAMESPACE_BEGIN
 
+class UnicodeString;
+
 /**
  * Standard CLDR plural form/category constants.
  * See http://www.unicode.org/reports/tr35/tr35-numbers.html#Language_Plural_Rules
@@ -48,6 +50,14 @@ public:
     }
 
     /**
+     * @param keyword for example "few" or "other"
+     * @return the plural form corresponding to the keyword, or OTHER
+     */
+    static Form orOtherFromString(const UnicodeString &keyword) {
+        return static_cast<Form>(indexOrOtherIndexFromString(keyword));
+    }
+
+    /**
      * Sets U_ILLEGAL_ARGUMENT_ERROR if the keyword is not a plural form.
      *
      * @param keyword for example "few" or "other"
@@ -58,6 +68,16 @@ public:
     }
 
     /**
+     * Sets U_ILLEGAL_ARGUMENT_ERROR if the keyword is not a plural form.
+     *
+     * @param keyword for example "few" or "other"
+     * @return the plural form corresponding to the keyword
+     */
+    static Form fromString(const UnicodeString &keyword, UErrorCode &errorCode) {
+        return static_cast<Form>(indexFromString(keyword, errorCode));
+    }
+
+    /**
      * @param keyword for example "few" or "other"
      * @return the index of the plural form corresponding to the keyword, or a negative value
      */
@@ -65,7 +85,13 @@ public:
 
     /**
      * @param keyword for example "few" or "other"
-     * @return the index of the plural form corresponding to the keyword, or OTHER_INDEX
+     * @return the index of the plural form corresponding to the keyword, or a negative value
+     */
+    static int32_t indexOrNegativeFromString(const UnicodeString &keyword);
+
+    /**
+     * @param keyword for example "few" or "other"
+     * @return the index of the plural form corresponding to the keyword, or OTHER
      */
     static int32_t indexOrOtherIndexFromString(const char *keyword) {
         int32_t i = indexOrNegativeFromString(keyword);
@@ -73,12 +99,29 @@ public:
     }
 
     /**
+     * @param keyword for example "few" or "other"
+     * @return the index of the plural form corresponding to the keyword, or OTHER
+     */
+    static int32_t indexOrOtherIndexFromString(const UnicodeString &keyword) {
+        int32_t i = indexOrNegativeFromString(keyword);
+        return i >= 0 ? i : OTHER;
+    }
+
+    /**
      * Sets U_ILLEGAL_ARGUMENT_ERROR if the keyword is not a plural form.
      *
      * @param keyword for example "few" or "other"
      * @return the index of the plural form corresponding to the keyword
      */
     static int32_t indexFromString(const char *keyword, UErrorCode &errorCode);
+
+    /**
+     * Sets U_ILLEGAL_ARGUMENT_ERROR if the keyword is not a plural form.
+     *
+     * @param keyword for example "few" or "other"
+     * @return the index of the plural form corresponding to the keyword
+     */
+    static int32_t indexFromString(const UnicodeString &keyword, UErrorCode &errorCode);
 };
 
 U_NAMESPACE_END