private static Matcher checkParam(String param, int expected, LineProc todo) {
Matcher paramM = paramP.matcher(param);
if (!paramM.matches()) {
todo.parseException("Illegal parameter");
return paramM;
} else if (paramM.group(2) != null) {
if (expected == 2) {
return paramM;
} else {
todo.parseException("Unexpected second parameter: " + paramM.group(2));
return null;
}
} else if (paramM.group(1) != null) {
if (expected == 1) {
return paramM;
} else if (expected == 0) {
todo.parseException("Unexpected parameter: " + param);
return null;
} else {
todo.parseException("Missing second parameter");
return null;
}
} else {
if (expected == 0) {
return paramM;
} else {
todo.parseException("Unexpected parameter: " + param);
return null;
}
}
}
static void parseLine(String line, LineProc todo) {
if (line.length() == 0) {; // empty line, ignore
} else {
Matcher topM = topP.matcher(line);
if (!topM.matches()) {
todo.parseException("Unrecognized syntax: " + line);
} else if (topM.group(1) != null) {
todo.stop();
} else if (topM.group(2) != null) {
todo.label(topM.group(2));
} else {
String instr = topM.group(3);
String param = topM.group(4);
Matcher instrM = instrP.matcher(instr);
if (!instrM.matches()) {
todo.parseException("Illegal instruction: " + instr);
} else if (instrM.group(1) != null) { // deck
Matcher deckParamM = deckParamP.matcher(param);
if (!deckParamM.matches()) {
todo.parseException("Illegal deck definition parameters: " + param);
} else if (deckParamM.group(2) != null) {
todo.read(deckParamM.group(1));
} else {
todo.makeDeck(deckParamM.group(1));
}
} else if (instrM.group(2) != null) { // movetop
Matcher paramM = checkParam(param, 2, todo);
if (paramM != null) todo.moveTop(paramM.group(1), paramM.group(2));
} else if (instrM.group(3) != null) { // moveall
Matcher paramM = checkParam(param, 2, todo);
if (paramM != null) todo.moveAll(paramM.group(1), paramM.group(2));
} else if (instrM.group(4) != null) { // jump
Matcher jumpParamM = jumpParamP.matcher(param);
if (!jumpParamM.matches()) {
todo.parseException("Illegal jump parameters: " + param);
} else if (jumpParamM.group(1) != null) { // if empty
todo.jumpEmpty(jumpParamM.group(1), jumpParamM.group(2));
} else if (jumpParamM.group(3) != null) { // if not empty
todo.jumpNotEmpty(jumpParamM.group(3), jumpParamM.group(4));
} else if (jumpParamM.group(5) != null) { // if <comparison>
String cond = jumpParamM.group(5);
String left = jumpParamM.group(6);
String right = jumpParamM.group(7);
String label = jumpParamM.group(8);
if ("less".equals(cond)) {
todo.jumpLess(left, right, label);
} else if ("greater".equals(cond)) {
todo.jumpGreater(left, right, label);
} else if ("equal".equals(cond)) {
todo.jumpEqual(left, right, label);
} else {
todo.parseException("Expected less, greater, or equal: " + cond);
}
} else { // unconditional jump
todo.jump(jumpParamM.group(9));
}
} else if (instrM.group(5) != null) { // output
Matcher paramM = checkParam(param, 1, todo);
if (paramM != null) todo.output(paramM.group(1));
}
}
}
}