FOP-2416: add support for Arabic Joiners (ZWJ/ZWNJ) - preliminary

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1631546 13f79535-47bb-0310-9956-ffa450edef68

5 files changed, 147 insertions, 5 deletions

diff --git a/test/java/org/apache/fop/complexscripts/scripts/ScriptsTestSuite.java b/test/java/org/apache/fop/complexscripts/scripts/ScriptsTestSuite.java
index c48be5220..27914450a 100644
--- a/test/java/org/apache/fop/complexscripts/scripts/ScriptsTestSuite.java
+++ b/test/java/org/apache/fop/complexscripts/scripts/ScriptsTestSuite.java
@@ -23,12 +23,16 @@ import org.junit.runner.RunWith;
 import org.junit.runners.Suite;
 import org.junit.runners.Suite.SuiteClasses;
 
-import org.apache.fop.complexscripts.scripts.arabic.ArabicTestCase;
+import org.apache.fop.complexscripts.scripts.arabic.ArabicJoinersTestCase;
+import org.apache.fop.complexscripts.scripts.arabic.ArabicWordFormsTestCase;
 
 /**
  * Test suite for script specific functionality related to complex scripts.
  */
 @RunWith(Suite.class)
-@SuiteClasses(ArabicTestCase.class)
+@SuiteClasses({
+    ArabicJoinersTestCase.class,
+    ArabicWordFormsTestCase.class
+})
 public class ScriptsTestSuite {
 }
diff --git a/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicJoinersTestCase.java b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicJoinersTestCase.java
new file mode 100644
index 000000000..092bebd41
--- /dev/null
+++ b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicJoinersTestCase.java
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.complexscripts.scripts.arabic;
+
+import java.nio.IntBuffer;
+import java.util.BitSet;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertTrue;
+
+import org.apache.fop.complexscripts.scripts.ScriptProcessor;
+import org.apache.fop.complexscripts.util.CharScript;
+import org.apache.fop.complexscripts.util.GlyphContextTester;
+import org.apache.fop.complexscripts.util.GlyphSequence;
+import org.apache.fop.complexscripts.util.ScriptContextTester;
+import org.apache.fop.complexscripts.util.UTF32;
+
+// CSOFF: LineLength
+
+/**
+ * Tests for joiner (ZWJ, ZWNJ) functionality related to the arabic script.
+ */
+public class ArabicJoinersTestCase {
+
+    private static final String[][] ZWJ_TESTS_ISOL = new String[][] {
+        { "\u0643",               "1",          },
+        { "\u0643\u200D",         "00",         },
+        { "\u200D\u0643",         "00",         },
+        { "\u200D\u0643\u200D",   "000",        },
+    };
+
+    private static final String[][] ZWJ_TESTS_INIT = new String[][] {
+        { "\u0643",               "0",          },
+        { "\u0643\u200D",         "10",         },
+        { "\u200D\u0643",         "00",         },
+        { "\u200D\u0643\u200D",   "000",        },
+    };
+
+    private static final String[][] ZWJ_TESTS_MEDI = new String[][] {
+        { "\u0643",               "0",          },
+        { "\u0643\u200D",         "00",         },
+        { "\u200D\u0643",         "00",         },
+        { "\u200D\u0643\u200D",   "010",        },
+    };
+
+    private static final String[][] ZWJ_TESTS_FINA = new String[][] {
+        { "\u0643",               "0",          },
+        { "\u0643\u200D",         "00",         },
+        { "\u200D\u0643",         "01",         },
+        { "\u200D\u0643\u200D",   "000",        },
+    };
+
+    private static final String[][] ZWJ_TESTS_LIGA = new String[][] {
+    };
+
+    @Test
+    public void testArabicJoiners() {
+        String script = CharScript.scriptTagFromCode(CharScript.SCRIPT_ARABIC);
+        ScriptProcessor sp = ScriptProcessor.getInstance(script);
+        assertTrue(sp != null);
+        ScriptContextTester sct = sp.getSubstitutionContextTester();
+        assertTrue(sct != null);
+        String language = "dflt";
+        int flags = 0;
+        testZWJ(sct, script, language, "isol", flags, ZWJ_TESTS_ISOL);
+        testZWJ(sct, script, language, "init", flags, ZWJ_TESTS_INIT);
+        testZWJ(sct, script, language, "medi", flags, ZWJ_TESTS_MEDI);
+        testZWJ(sct, script, language, "fina", flags, ZWJ_TESTS_FINA);
+        testZWJ(sct, script, language, "liga", flags, ZWJ_TESTS_LIGA);
+    }
+
+    private void testZWJ(ScriptContextTester sct, String script, String language, String feature, int flags, String[][] tests) {
+        GlyphContextTester gct = sct.getTester(feature);
+        assertTrue(gct != null);
+        for (String[] t : tests) {
+            testZWJ(gct, script, language, feature, flags, t);
+        }
+    }
+
+    private void testZWJ(GlyphContextTester gct, String script, String language, String feature, int flags, String[] test) {
+        assert test.length == 2;
+        String str = test[0];
+        BitSet act = new BitSet();
+        GlyphSequence gs = makeGlyphSequence(str);
+        for (int i = 0, n = str.length(); i < n; ++i) {
+            if (gct.test(script, language, feature, gs, i, flags)) {
+                act.set(i);
+            }
+        }
+        BitSet exp = parseBitSet(test[1]);
+        assertTrue(act.equals(exp));
+    }
+
+    private GlyphSequence makeGlyphSequence(String s) {
+        Integer[] ca = UTF32.toUTF32(s, 0, true);
+        IntBuffer cb = IntBuffer.allocate(ca.length);
+        for (Integer c : ca) {
+            cb.put(c);
+        }
+        cb.rewind();
+        return new GlyphSequence(cb, null, null);
+    }
+
+    private BitSet parseBitSet(String s) {
+        BitSet bits = new BitSet();
+        for (int i = 0, n = s.length(); i < n; ++i) {
+            char c = s.charAt(i);
+            assert (c == '0') || (c == '1');
+            if (c == '1') {
+                bits.set(i);
+            }
+        }
+        return bits;
+    }
+
+    @Test
+    public void testArabicNonJoiners() {
+    }
+
+}
diff --git a/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicTestConstants.java b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicWordFormsConstants.java
index cc9167553..41094b687 100644
--- a/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicTestConstants.java
+++ b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicWordFormsConstants.java
@@ -22,7 +22,7 @@ package org.apache.fop.complexscripts.scripts.arabic;
 /**
  * Constants for test functionality related to the arabic script.
  */
-public interface ArabicTestConstants {
+public interface ArabicWordFormsConstants {
 
     String WF_FILE_SCRIPT = "arab";
     String WF_FILE_LANGUAGE = "dflt";
diff --git a/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicTestCase.java b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicWordFormsTestCase.java
index 8542faae9..abe4f513a 100644
--- a/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicTestCase.java
+++ b/test/java/org/apache/fop/complexscripts/scripts/arabic/ArabicWordFormsTestCase.java
@@ -44,7 +44,7 @@ import org.apache.fop.complexscripts.util.GlyphSequence;
 /**
  * Tests for functionality related to the arabic script.
  */
-public class ArabicTestCase implements ArabicTestConstants {
+public class ArabicWordFormsTestCase implements ArabicWordFormsConstants {
 
     @Test
     public void testArabicWordForms() {
diff --git a/test/java/org/apache/fop/complexscripts/scripts/arabic/GenerateArabicTestData.java b/test/java/org/apache/fop/complexscripts/scripts/arabic/GenerateArabicTestData.java
index 9ca16a164..35bfb3128 100644
--- a/test/java/org/apache/fop/complexscripts/scripts/arabic/GenerateArabicTestData.java
+++ b/test/java/org/apache/fop/complexscripts/scripts/arabic/GenerateArabicTestData.java
@@ -40,7 +40,7 @@ import org.apache.fop.complexscripts.util.GlyphSequence;
 /**
  * Tests for functionality related to the arabic script.
  */
-public final class GenerateArabicTestData implements ArabicTestConstants {
+public final class GenerateArabicTestData implements ArabicWordFormsConstants {
 
     private GenerateArabicTestData() {
     }