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package com.github.javaparser.generator.core.other;
import java.util.function.Function;
/**
* Prints the LETTER and PART_LETTER tokens. They should be inserted into the grammar manually.
*/
public class GrammarLetterGenerator {
public static void main(String[] args) {
generate("LETTER", c -> Character.isJavaIdentifierStart(c) || Character.isHighSurrogate((char) (int) c) || Character.isLowSurrogate((char) (int) c));
generate("PART_LETTER", c -> Character.isJavaIdentifierPart(c) || Character.isHighSurrogate((char) (int) c) || Character.isLowSurrogate((char) (int) c));
}
private static void generate(String tokenName, Function<Integer, Boolean> f) {
final String indent = " ";
System.out.println(" < #" + tokenName + ": [");
System.out.print(indent);
int nltime = 0;
int i = 0;
while (i < 0x10000) {
while (!f.apply(i) && i < 0x10000) {
i++;
}
String start = format(i);
while (f.apply(i) && i < 0x10000) {
i++;
}
String end = format(i - 1);
if (i >= 0x10000) {
break;
}
if (start.equals(end)) {
nltime++;
System.out.print(start + ", ");
} else {
nltime += 2;
System.out.print(start + "-" + end + ", ");
}
if (nltime >= 10) {
nltime = 0;
System.out.println();
System.out.print(indent);
}
}
// Too lazy to remove the final illegal comma.
System.out.println("]");
System.out.println(" >");
}
private static String format(int i) {
return String.format("\"\\u%04x\"", i);
}
}
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