private static Object parseValue(CharacterIterator it) {
switch (it.current()) {
case '{':
return parseObject(it);
case '[':
return parseArray(it);
case '"':
return parseString(it);
case '-':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return parseNumber(it);
case 't':
parseText(Boolean.TRUE.toString(), it);
return Boolean.TRUE;
case 'f':
parseText(Boolean.FALSE.toString(), it);
return Boolean.FALSE;
case 'n':
parseText(NULL, it);
return null;
}
throw error(
"Bad JSON starting character '" + it.current() + "'", it); // $NON-NLS-1$ //$NON-NLS-2$;
}
private static List parseArray(CharacterIterator it) {
it.next();
parseWhitespace(it);
if (it.current() == ']') {
it.next();
return Collections.EMPTY_LIST;
}
List list = new ArrayList();
while (true) {
Object value = parseValue(it);
list.add(value);
parseWhitespace(it);
if (it.current() == ',') {
it.next();
parseWhitespace(it);
continue;
}
if (it.current() != ']')
throw error(
"expected an array close ']' but was '" + it.current() + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$
break;
}
it.next();
return list;
}
public int current() {
int c = iterator.current();
if (c == CharacterIterator.DONE) {
return DONE;
}
return c;
}
private static Object parse(CharacterIterator it) {
parseWhitespace(it);
Object result = parseValue(it);
parseWhitespace(it);
if (it.current() != CharacterIterator.DONE) throw error("should be done", it); // $NON-NLS-1$
return result;
}
public int next() {
int i = iterator.current();
iterator.next();
if (i == CharacterIterator.DONE) {
return DONE;
}
return i;
}
private static void parseText(String string, CharacterIterator it) {
int length = string.length();
char c = it.current();
for (int i = 0; i < length; i++) {
if (c != string.charAt(i))
throw error(
"expected to parse '" + string + "' but character " + (i + 1) + " was '" + c + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$;
c = it.next();
}
}
public static Tile[] fromPuzzleString(String puzzleAsString) {
Tile[] puzzle = new Tile[puzzleAsString.length()];
CharacterIterator charIterator = new StringCharacterIterator(puzzleAsString);
for (int y = 0; y < 9; ++y) {
for (int x = 0; x < 9; ++x) {
puzzle[y * 9 + x] = new Tile(x, y, charIterator.current() - '0');
charIterator.next();
}
}
return puzzle;
}
/** Returns the count of next character. */
private int getCurrentCodePointCount() {
char c1 = text.current();
if (Character.isHighSurrogate(c1) && text.getIndex() < text.getEndIndex()) {
char c2 = text.next();
text.previous();
if (Character.isLowSurrogate(c2)) {
return 2;
}
}
return 1;
}
/** Returns current character */
int getCurrent() {
char c1 = text.current();
if (Character.isHighSurrogate(c1) && text.getIndex() < text.getEndIndex()) {
char c2 = text.next();
text.previous();
if (Character.isLowSurrogate(c2)) {
return Character.toCodePoint(c1, c2);
}
}
return (int) c1;
}
@Nullable
private static String parseClassSignature(
final CharacterIterator signatureIterator, final List<String> convertedInterfaces)
throws ClsFormatException {
final String convertedSuper =
SignatureParsing.parseTopLevelClassRefSignature(signatureIterator);
while (signatureIterator.current() != CharacterIterator.DONE) {
final String ifs = SignatureParsing.parseTopLevelClassRefSignature(signatureIterator);
if (ifs == null) throw new ClsFormatException();
convertedInterfaces.add(ifs);
}
return convertedSuper;
}
private static Object parseNumber(CharacterIterator it) {
StringBuffer buffer = new StringBuffer();
char c = it.current();
while (Character.isDigit(c) || c == '-' || c == '+' || c == '.' || c == 'e' || c == 'E') {
buffer.append(c);
c = it.next();
}
try {
return new BigDecimal(buffer.toString());
} catch (NumberFormatException e) {
throw error(
"expected a number but was '" + buffer.toString() + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$;
}
}
public Object read(CharacterIterator ci, int start) {
it = ci;
switch (start) {
case FIRST:
c = it.first();
break;
case CURRENT:
c = it.current();
break;
case NEXT:
c = it.next();
break;
}
return read();
}
private static Map parseObject(CharacterIterator it) {
it.next();
parseWhitespace(it);
if (it.current() == '}') {
it.next();
return Collections.EMPTY_MAP;
}
Map map = new HashMap();
while (true) {
if (it.current() != '"')
throw error(
"expected a string start '\"' but was '" + it.current() + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$
String key = parseString(it);
if (map.containsKey(key))
throw error("' already defined" + "key '" + key, it); // $NON-NLS-1$ //$NON-NLS-2$
parseWhitespace(it);
if (it.current() != ':')
throw error(
"expected a pair separator ':' but was '" + it.current() + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$
it.next();
parseWhitespace(it);
Object value = parseValue(it);
map.put(key, value);
parseWhitespace(it);
if (it.current() == ',') {
it.next();
parseWhitespace(it);
continue;
}
if (it.current() != '}')
throw error(
"expected an object close '}' but was '" + it.current() + "'",
it); //$NON-NLS-1$ //$NON-NLS-2$
break;
}
it.next();
return map;
}
/**
* The <code>setBreakPoint()</code> method inserts a breakpoint into the program. It does so by
* inserting a special probe that will call back into the <code>commandLoop()</code> before the
* instruction executes.
*
* @param i the iterator over the characters of the command
* @param on true if the breakpoint should be inserted; false if it should be removed
* @throws IOException if there is a problem communicating over the socket
*/
void setBreakPoint(CharacterIterator i, boolean on) throws IOException {
// TODO: deal with length as well!
char num = i.current();
i.next();
switch (num) {
case '0':
case '1':
if (!StringUtil.peekAndEat(i, ',')) break;
int addr = StringUtil.readHexValue(i, 4);
if (!StringUtil.peekAndEat(i, ',')) break;
int len = StringUtil.readHexValue(i, 4);
for (int cntr = addr; cntr < addr + len; cntr += 2) setBreakPoint(addr, on);
sendPacketOK("OK");
return;
case '2':
// TODO: other breakpoint types?
case '3':
// TODO: other breakpoint types?
default:
}
sendPacketOK("");
}
private static void parseWhitespace(CharacterIterator it) {
char c = it.current();
while (Character.isWhitespace(c)) c = it.next();
}
public int next() {
startPosition = iterator.getIndex();
char c = iterator.current();
iterator.next(); // advance
if (c == CharacterIterator.DONE) {
kind = EOF;
} else if (Character.isJavaIdentifierStart(c)) {
buf.append(c);
boolean couldBeKeyword = Character.isLowerCase(c);
while (true) {
c = iterator.current();
if (!Character.isJavaIdentifierPart(c)) break;
buf.append(c);
if (couldBeKeyword) {
if (!Character.isLowerCase(c) || buf.length() > MAX_KEYWORD_LENGTH)
couldBeKeyword = false;
}
c = iterator.next();
}
kind = NORMAL_TEXT;
if (couldBeKeyword) {
if (KEYWORDS.contains(buf.toString())) kind = KEYWORD;
}
buf.setLength(0);
} else if (c == '/') {
char c2 = iterator.current();
if (c2 == '/') {
while (true) {
c2 = iterator.next();
if (c2 == '\n' || c2 == '\r' || c2 == CharacterIterator.DONE) break;
}
kind = COMMENT;
return kind;
} else if (c2 == '*') {
scanComment:
while (c2 != CharacterIterator.DONE) {
c2 = iterator.next();
if (c2 == '*') {
do {
c2 = iterator.next();
if (c2 == '/') break scanComment;
} while (c2 == '*');
}
}
kind = JAVADOC;
return kind;
}
} else if (c == '"') {
kind = QUOTE;
char c2 = iterator.current();
while (c2 != '"' && c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE) {
if (c2 == '\\') {
c2 = iterator.next();
if (c2 == '\n' || c2 == '\r') break;
}
c2 = iterator.next();
}
iterator.next(); // advance past closing char
} else if (c == '\'') {
// need to catch '"' so isn't considered to start a String
kind = QUOTE; // or NORMAL_TEXT ?
char c2 = iterator.current();
if (c2 == '\\') c2 = iterator.next(); // advance past the escape char
if (c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE)
c2 = iterator.next(); // advance past the content char
if (c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE)
iterator.next(); // advance past closing char
} else kind = NORMAL_TEXT;
// System.out.println(kind + " " + startPosition + "-" + iterator.getIndex());
return kind;
}
/**
* The <code>executeCommand()</code> method executes a single command that has been read from
* the socket and packaged as a string. If the command should resume the simulation, this method
* will return <code>true</code>, and <code>false</code> otherwise.
*
* @param command the command packaged as a string
* @return true if the simulation should resume; false otherwise
* @throws IOException if there is a problem communicating over the socket
*/
boolean executeCommand(String command) throws IOException {
CharacterIterator i = new StringCharacterIterator(command);
if (i.current() == '+') i.next();
if (!StringUtil.peekAndEat(i, '$')) {
commandError();
return false;
}
char c = i.current();
i.next();
switch (c) {
case 'c':
// CONTINUE WITH EXECUTION
// TODO: implement continue at address
sendPlus();
return true;
case 'D':
// DISCONNECT
Terminal.println("GDBServer: disconnected");
sendPlus();
simulator.stop();
return true;
case 'g':
// READ REGISTERS
readAllRegisters();
return false;
case 'G':
// WRITE REGISTERS
// TODO: implement update of registers
break;
case 'H':
// SET THREAD CONTEXT -- THERE IS ONLY ONE
sendPacketOK("OK");
return false;
case 'i':
// STEP CYCLE
isStepping = true;
break;
case 'k':
// KILL
Terminal.println("GDBServer: killed remotely");
sendPlus();
simulator.stop();
return true;
case 'm':
readMemory(i);
return false;
case 'M':
// WRITE MEMORY
// TODO: implement writes to memory
break;
case 'p':
// READ SELECTED REGISTERS
readOneRegister(i);
return false;
case 'P':
// WRITE SELECTED REGISTERS
// TODO: implement writes to selected registers
break;
case 'q':
// QUERY A VARIABLE
// TODO: implement queries to variables
break;
case 's':
// STEP INSTRUCTION
isStepping = true;
sendPlus();
return true;
case 'z':
// REMOVE BREAKPOINT
setBreakPoint(i, false);
return false;
case 'Z':
// SET BREAKPOINT
setBreakPoint(i, true);
return false;
case '?':
// GET LAST SIGNAL
sendPacketOK("S05");
return false;
}
// didn't understand the comand
sendPacketOK("");
return false;
}
