/**
* Return a set of the variables in the supplied expression. Note: Substitutions which are in the
* constant table are not included.
*/
public Set<String> getVariablesWithin(String exp) {
Set<String> all = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
String add = null;
if (separators == null) {
StringBuilder sep = new StringBuilder(10);
for (char chr = 0; chr < operators.length; chr++) {
if (operators[chr] != null && !operators[chr].internal) {
sep.append(chr);
}
}
sep.append("()");
separators = sep.toString();
}
for (StringTokenizer tkz = new StringTokenizer(exp, separators, true); tkz.hasMoreTokens(); ) {
String tkn = tkz.nextToken().trim();
if (tkn.length() != 0 && Character.isLetter(tkn.charAt(0))) {
add = tkn;
} else if (tkn.length() == 1 && tkn.charAt(0) == '(') {
add = null;
} else if (add != null && !constants.containsKey(add)) {
all.add(add);
}
}
if (add != null && !constants.containsKey(add)) {
all.add(add);
}
return all;
}
public static String nextString() throws Exception {
for (; st == null || !st.hasMoreTokens(); ) {
String k1 = in.readLine();
if (k1 == null) return null;
st = new StringTokenizer(k1);
}
return st.nextToken();
}
boolean hasNext() {
while (tokenizer == null || !tokenizer.hasMoreTokens())
try {
tokenizer = new StringTokenizer(buff.readLine());
} catch (Exception e) {
return false;
}
return true;
}
public String next() {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
try {
tokenizer = new StringTokenizer(reader.readLine());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
eof = true;
return "0";
}
}
return st.nextToken();
}
String next() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
eof = true;
break;
}
}
String ret = buf;
buf = eof ? "-1" : st.nextToken();
return ret;
}
String nextToken() {
if (!createST) {
try {
curLine = readLine();
} catch (Exception e) {
eof = true;
}
return null;
}
while (st == null || !st.hasMoreTokens()) {
try {
curLine = readLine();
st = new StringTokenizer(curLine);
} catch (Exception e) {
eof = true;
break;
}
}
String ret = buf;
buf = eof ? "-1" : st.nextToken();
return ret;
}
String next() throws IOException {
while (!tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
String next() throws IOException {
while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(in.readLine().trim());
return st.nextToken();
}
private static String nextToken() throws IOException {
while (!tok.hasMoreTokens()) tok = new StringTokenizer(in.readLine());
return tok.nextToken();
}