/**
* Constructs automaton that accept strings representing the given integer. Surrounding whitespace
* is permitted.
*
* @param value string representation of integer
*/
public static DefaultAutomaton makeIntegerValue(String value) {
boolean minus = false;
int i = 0;
while (i < value.length()) {
char c = value.charAt(i);
if (c == '-') minus = true;
if (c >= '1' && c <= '9') break;
i++;
}
StringBuilder b = new StringBuilder();
b.append(value.substring(i));
if (b.length() == 0) b.append("0");
DefaultAutomaton s;
if (minus) s = makeChar('-');
else s = makeChar('+').optional();
DefaultAutomaton ws = Datatypes.getWhitespaceAutomaton();
return (ws.concatenate(
s.concatenate(makeChar('0').repeat()).concatenate(makeString(b.toString())))
.concatenate(ws))
.minimize();
}
/**
* Constructs automaton that accept strings representing the given decimal number. Surrounding
* whitespace is permitted.
*
* @param value string representation of decimal number
*/
public static DefaultAutomaton makeDecimalValue(String value) {
boolean minus = false;
int i = 0;
while (i < value.length()) {
char c = value.charAt(i);
if (c == '-') minus = true;
if ((c >= '1' && c <= '9') || c == '.') break;
i++;
}
StringBuilder b1 = new StringBuilder();
StringBuilder b2 = new StringBuilder();
int p = value.indexOf('.', i);
if (p == -1) b1.append(value.substring(i));
else {
b1.append(value.substring(i, p));
i = value.length() - 1;
while (i > p) {
char c = value.charAt(i);
if (c >= '1' && c <= '9') break;
i--;
}
b2.append(value.substring(p + 1, i + 1));
}
if (b1.length() == 0) b1.append("0");
DefaultAutomaton s;
if (minus) s = makeChar('-');
else s = makeChar('+').optional();
DefaultAutomaton d;
if (b2.length() == 0) d = makeChar('.').concatenate(repeat(makeChar('0'), 1)).optional();
else
d = makeChar('.').concatenate(makeString(b2.toString())).concatenate(makeChar('0').repeat());
DefaultAutomaton ws = Datatypes.getWhitespaceAutomaton();
return (ws.concatenate(
s.concatenate(makeChar('0').repeat())
.concatenate(makeString(b1.toString()))
.concatenate(d))
.concatenate(ws))
.minimize();
}