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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
class LangFunction extends Function1 {
ConvertibleExpr makeCallExpr(ConvertibleExpr e) throws ParseException {
final StringExpr se = e.makeStringExpr();
return new ConvertibleBooleanExpr() {
public boolean eval(Node node, ExprContext context) throws XSLException {
return lang(node, se.eval(node, context));
}
};
}
private static boolean lang(Node node, String lang) {
Name XML_LANG =
node.getNamespacePrefixMap().getNameTable().createName("xml:lang",
Name.XML_NAMESPACE);
while (node != null) {
String nodeLang = node.getAttributeValue(XML_LANG);
if (nodeLang != null)
return isSubLanguage(lang, nodeLang);
node = node.getParent();
}
return false;
}
private static boolean isSubLanguage(String lang1, String lang2) {
int len1 = lang1.length();
int len2 = lang2.length();
if (len1 > len2)
return false;
if (len1 < len2 && lang2.charAt(len1) != '-')
return false;
for (int i = 0; i < len1; i++) {
char c1 = lang1.charAt(i);
char c2 = lang2.charAt(i);
switch ((int)c1 - (int)c2) {
case 0:
case 'a' - 'A':
case 'A' - 'a':
break;
default:
return false;
}
}
return true;
}
}
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