private void escapeChar() {
nextChar();
switch (c) {
case 34: // '"'
case 39: // '\''
case 92: // '\\'
case 98: // 'b'
case 102: // 'f'
case 110: // 'n'
case 114: // 'r'
case 116: // 't'
lastLiteral = c;
nextChar();
return;
}
int i = Character.digit((char) c, 8);
if (i >= 0) {
lastLiteral = 0;
int j = i >= 4 ? 2 : 3;
do {
lastLiteral = (lastLiteral << 3) + i;
nextChar();
i = Character.digit((char) c, 8);
} while (i >= 0 && --j > 0);
return;
} else {
report(new Failure(getPos(), "Syntax error in escape sequence"));
return;
}
}
private int number() {
int i = col;
int j = 0;
int k = Character.digit((char) c, 10);
do {
j = 10 * j + k;
nextChar();
k = Character.digit((char) c, 10);
} while (k >= 0);
lexemeText = line.substring(i, col);
lastLiteral = j;
return token = 6;
}
private int identifier() {
int i = col;
do nextChar();
while (c != -1 && Character.isJavaIdentifierPart((char) c));
lexemeText = line.substring(i, col);
return token = 3;
}
private int directive() {
nextChar();
if (c == 37) {
nextChar();
return token = 1;
}
if (Character.isJavaIdentifierStart((char) c)) {
identifier();
if (lexemeText.equals("token")) return token = 8;
if (lexemeText.equals("type")) return token = 9;
if (lexemeText.equals("prec")) return token = 10;
if (lexemeText.equals("left")) return token = 11;
if (lexemeText.equals("right")) return token = 12;
if (lexemeText.equals("nonassoc")) return token = 13;
if (lexemeText.equals("start")) return token = 14;
if (lexemeText.equals("package")) return token = 15;
if (lexemeText.equals("extends")) return token = 18;
if (lexemeText.equals("implements")) return token = 19;
if (lexemeText.equals("semantic")) return token = 20;
if (lexemeText.equals("get")) return token = 21;
if (lexemeText.equals("next")) return token = 22;
if (lexemeText.equals("class")) return token = 16;
if (lexemeText.equals("interface")) {
return token = 17;
} else {
report(new Failure(getPos(), "Unrecognized directive"));
return -1;
}
}
if (c == 123) {
nextChar();
return code();
} else {
report(new Failure(getPos(), "Illegal directive syntax"));
return -1;
}
}
public int nextToken() {
do {
skipWhitespace();
markPosition();
lexemeText = null;
switch (c) {
case -1:
return token = 0;
case 58: // ':'
nextChar();
return token = 58;
case 59: // ';'
nextChar();
return token = 59;
case 124: // '|'
nextChar();
return token = 124;
case 60: // '<'
nextChar();
return token = 60;
case 62: // '>'
nextChar();
return token = 62;
case 91: // '['
nextChar();
return token = 91;
case 93: // ']'
nextChar();
return token = 93;
case 46: // '.'
nextChar();
return token = 46;
case 37: // '%'
if (directive() != -1) return token;
break;
case 34: // '"'
if (string() != -1) return token;
break;
case 39: // '\''
if (literal() != -1) return token;
break;
case 123: // '{'
if (action() != -1) return token;
break;
case 47: // '/'
skipComment();
break;
default:
if (Character.isJavaIdentifierStart((char) c)) return identifier();
if (Character.isDigit((char) c)) return number();
illegalCharacter();
nextChar();
break;
}
} while (true);
}
