/**
* Convert from an ANTLR char literal found in a grammar file to an equivalent char literal in the
* target language. For most languages, this means leaving 'x' as 'x'. Actually, we need to escape
* '\u000A' so that it doesn't get converted to \n by the compiler. Convert the literal to the
* char value and then to an appropriate target char literal.
*
* <p>Expect single quotes around the incoming literal.
*/
public String getTargetCharLiteralFromANTLRCharLiteral(CodeGenerator generator, String literal) {
StringBuffer buf = new StringBuffer();
buf.append('\'');
int c = Grammar.getCharValueFromGrammarCharLiteral(literal);
if (c < Label.MIN_CHAR_VALUE) {
return "'\u0000'";
}
if (c < targetCharValueEscape.length && targetCharValueEscape[c] != null) {
buf.append(targetCharValueEscape[c]);
} else if (Character.UnicodeBlock.of((char) c) == Character.UnicodeBlock.BASIC_LATIN
&& !Character.isISOControl((char) c)) {
// normal char
buf.append((char) c);
} else {
// must be something unprintable...use \\uXXXX
// turn on the bit above max "\\uFFFF" value so that we pad with zeros
// then only take last 4 digits
String hex = Integer.toHexString(c | 0x10000).toUpperCase().substring(1, 5);
buf.append("\\u");
buf.append(hex);
}
buf.append('\'');
return buf.toString();
}
@Override
public String getTargetCharLiteralFromANTLRCharLiteral(
final CodeGenerator generator, final String literal) {
final StringBuffer buf = new StringBuffer(10);
final int c = Grammar.getCharValueFromGrammarCharLiteral(literal);
if (c < Label.MIN_CHAR_VALUE) {
buf.append("\\x{0000}");
} else if (c < targetCharValueEscape.length && targetCharValueEscape[c] != null) {
buf.append(targetCharValueEscape[c]);
} else if (Character.UnicodeBlock.of((char) c) == Character.UnicodeBlock.BASIC_LATIN
&& !Character.isISOControl((char) c)) {
// normal char
buf.append((char) c);
} else {
// must be something unprintable...use \\uXXXX
// turn on the bit above max "\\uFFFF" value so that we pad with zeros
// then only take last 4 digits
String hex = Integer.toHexString(c | 0x10000).toUpperCase().substring(1, 5);
buf.append("\\x{");
buf.append(hex);
buf.append("}");
}
if (buf.indexOf("\\") == -1) {
// no need for interpolation, use single quotes
buf.insert(0, '\'');
buf.append('\'');
} else {
// need string interpolation
buf.insert(0, '\"');
buf.append('\"');
}
return buf.toString();
}
public String getTargetCharLiteralFromANTLRCharLiteral(CodeGenerator generator, String literal) {
int c = Grammar.getCharValueFromGrammarCharLiteral(literal);
return String.valueOf(c);
}
