[xmlvm-users] Unicode characters in Java Strings when compiling to Objective C.

[William W. <wo...@al...>]

I'm using XMLVM to cross-compile some math routines to be embedded into an iPhone/iPad application. One of the problems I ran across was that when a unicode character was added as part of a Java string ("\uxxxx"), it was being emitted in the Objective C code as "\xxxxx", with the characters as octal characters.

The following change causes characters to be output as unicode characters instead:

Around lines 812-822 of DEXmlvmOutputProcess.java (org.xmlvm.proc.out), replace:

                } else if (constant instanceof CstString) {
                    CstString cstString = (CstString) constant;
                    String valueOriginal = cstString.getString().getString();
                    String value = "";
                    // Convert special characters in string to octal notation
                    for (int i = 0; i < valueOriginal.length(); i++) {
                        char ch = valueOriginal.charAt(i);
                        value += (ch < ' ' || ch > 'z') ? String.format("\\%03o", new Integer(ch))
                                : ch;
                    }
                    dexInstruction.setAttribute("value", value);

with

                } else if (constant instanceof CstString) {
                    CstString cstString = (CstString) constant;
                    String valueOriginal = cstString.getString().getString();
                    String value = "";
                    // Convert special characters in string to octal notation
                    for (int i = 0; i < valueOriginal.length(); i++) {
                        char ch = valueOriginal.charAt(i);
                        value += (ch < ' ' || ch > 'z') ? String.format("\\u%04x", new Integer(ch))
//                                                                      ^^^^^^^^^^ Change here.
                                : ch;
                    }
                    dexInstruction.setAttribute("value", value);



Of course this is sub-optimal, given that this only works if targeting Objective C platforms, where "\uxxxx" is an accepted unicode character escape. But I'm putting it out there for what it's worth.

- Bill Woody