Added refineParsing to implement xml:lang shorthand

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@197658 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 57 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/fo/properties/XmlLang.java b/src/java/org/apache/fop/fo/properties/XmlLang.java
index 894855723..4f4994a17 100644
--- a/src/java/org/apache/fop/fo/properties/XmlLang.java
+++ b/src/java/org/apache/fop/fo/properties/XmlLang.java
@@ -20,6 +20,15 @@
  */
 package org.apache.fop.fo.properties;
 
+import org.apache.fop.datatypes.CountryType;
+import org.apache.fop.datatypes.LanguageType;
+import org.apache.fop.datatypes.NCName;
+import org.apache.fop.datatypes.PropertyValue;
+import org.apache.fop.datatypes.PropertyValueList;
+import org.apache.fop.fo.FONode;
+import org.apache.fop.fo.PropNames;
+import org.apache.fop.fo.expr.PropertyException;
+
 
 public class XmlLang extends Property  {
     public static final int dataTypes = SHORTHAND;
@@ -46,5 +55,53 @@ public class XmlLang extends Property  {
         return inherited;
     }
 
+    /**
+     * The value returned from the first stage of parsing must be an NCNAME.
+     * This can be any valid RFC 3066 language tag.  I.e. it must have at least
+     * a primary-subtag, which may be followed by 0 or more subtags, separated
+     * by hyphens.  The primary subtag must be an ISO 639-1 2-letter or
+     * ISO 639-2 3-letter code.  The second subtag, if it exists, may be an
+     * ISO 3166 2-letter country code.
+     * <p>If the primary subtag exists, and is a valid ISO 639 code, it will
+     * be used to generate a <code>LanguageType</code>
+     * <code>PropertyValue</code> assigned to the <code>Language</code>
+     * property.  If not, the property assignment is invalid.
+     * <p>If the second subtag exists, and is a valid ISO 3166 code, it
+     * will be used to generate a <code>CountryType</code>
+     * <code>PropertyValue</code> assigned to the <code>Country</code>.
+     * <p>All text beyond the last valid subtag detected, is ignored.
+     */
+    public PropertyValue refineParsing(
+            int propindex, FONode foNode, PropertyValue value)
+    throws PropertyException {
+        if (value.getType() != PropertyValue.NCNAME) {
+            throw new PropertyException("xml:lang requires NCNAME");
+        }
+        String text = ((NCName)value).getNCName();
+        if (text.charAt(text.length() - 1) == '-') {
+            throw new PropertyException("Invalid xml:lang code: " + text);
+        }
+        String[] bits = text.split("-");
+        // bits[0] = lang; if bits[1], bits[1] = country
+        // Is lang OK?
+        LanguageType lang = new LanguageType(PropNames.LANGUAGE, bits[0]);
+        // Is there a country code?
+        CountryType country = null;
+        if (bits.length > 1) {
+            try {
+                country = new CountryType(PropNames.COUNTRY, bits[1]);
+            } catch (PropertyException e) {
+                logger.fine("Invalid country code " + bits[1] + " in " + text);
+            }
+        }
+        if (country == null) {
+            return lang;
+        }
+        PropertyValueList list = new PropertyValueList(PropNames.XML_LANG);
+        list.add(lang);
+        list.add(country);
+        return list;
+    }
+
 }