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CaseConversion.java
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76 lines (70 loc) · 2.97 KB
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/*
* Helper to test Java case conversion (useful for comparison).
*/
import java.util.Locale;
import java.util.Properties;
public class CaseConversion {
public static final String dump(String x) throws Exception {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < x.length(); i++) {
if (i != 0) { sb.append(" "); }
sb.append(String.format("U+%04x", (int) x.charAt(i)));
}
return sb.toString();
}
public static final char getCharFromHex(String x) throws Exception {
return Character.toChars(Integer.valueOf(x, 16))[0];
}
/* Parse string as is, except recognize backslash followed by 'u'
* (4 hex digit escape), 'x' (2 hex digit escape) and another backslash
* (backslash escape). Note that when using this from a Unix shell,
* backslashes need to be escaped for the shell too.
*/
public static final String parseEscaped(String x) throws Exception {
StringBuffer sb = new StringBuffer();
for (int i = 0;;) {
if (i == x.length()) {
break;
} else if (i > x.length()) {
throw new Exception("invalid input");
}
char c = x.charAt(i);
if (c != '\\') {
sb.append(c);
i++;
} else {
c = x.charAt(i + 1);
if (c == 'x') {
sb.append(getCharFromHex(x.substring(i + 2, i + 4)));
i += 4;
} else if (c == 'u') {
sb.append(getCharFromHex(x.substring(i + 2, i + 6)));
i += 6;
} else if (c == '\\') {
sb.append('\\');
i += 2;
} else {
throw new Exception("invalid input");
}
}
}
return sb.toString();
}
public static final void main(String args[]) throws Exception {
Properties sysProps = System.getProperties();
Locale locale = new Locale(args[0]);
String inputString = parseEscaped(args[1]);
String uc = inputString.toUpperCase(locale);
String lc = inputString.toLowerCase(locale);
System.out.println("java.version: " + sysProps.getProperty("java.version"));
System.out.println("java.vendor: " + sysProps.getProperty("java.vendor"));
System.out.println("java.vendor.url: " + sysProps.getProperty("java.vendor.url"));
System.out.println("java.vm.version: " + sysProps.getProperty("java.vm.version"));
System.out.println("java.vm.vendor: " + sysProps.getProperty("java.vm.vendor"));
System.out.println("java.vm.name: " + sysProps.getProperty("java.vm.name"));
System.out.println("Locale: " + locale);
System.out.println("Input: " + dump(inputString));
System.out.println("toUpperCase: " + dump(uc));
System.out.println("toLowerCase: " + dump(lc));
}
}