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package com.jclark.xsl.expr;
import com.jclark.xsl.om.*;
class StringLengthFunction extends FunctionOpt1 {
ConvertibleExpr makeCallExpr(ConvertibleExpr e) {
final StringExpr se = e.makeStringExpr();
return new ConvertibleNumberExpr() {
public double eval(Node node, ExprContext context) throws XSLException {
return stringLength(se.eval(node, context));
}
};
}
private final static boolean isLowSurrogate(char c) {
return (c & 0xFC00) == 0xD800;
}
private final static int stringLength(String s) {
int n = s.length();
int len = n;
for (int i = 0; i < n; i++) {
if (isLowSurrogate(s.charAt(i)))
--len;
}
return len;
}
}
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