in src/com/amazon/ion/impl/IonTokenConstsX.java [789:812]
public final static int typeNameLetterIdx(int c) {
switch(c) {
case 'a': return 1;
case 'b': return 2;
case 'c': return 3;
case 'd': return 4;
case 'e': return 5;
case 'f': return 6;
case 'g': return 7;
case 'i': return 8;
case 'l': return 9;
case 'm': return 10;
case 'n': return 11;
case 'o': return 12;
case 'p': return 13;
case 'r': return 14;
case 's': return 15;
case 't': return 16;
case 'u': return 17;
case 'x': return 18;
case 'y': return 19;
default: return -1;
}
}