java case conversion tool for manual testing

src/CaseConversion.java

@@ -0,0 +1,76 @@
+/*
+ *  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));
+    }
+}