public static void main(String[] args)
{
char a[] = { 'a', '5', '?', 'A', ' ', '$', 'жа' };
for (int i = 0; i < a.length; i++) {
if (Character.isDigit(a[i]))
System.out.println(a[i] + " is a digit.");
if (Character.isLetter(a[i]))
System.out.println(a[i] + " is a letter.");
if (Character.isWhitespace(a[i]))
System.out.println(a[i] + " is whitespace.");
if (Character.isUpperCase(a[i]))
System.out.println(a[i] + " is uppercase.");
if (Character.isLowerCase(a[i]))
System.out.println(a[i] + " is lowercase.");
if (Character.isJavaIdentifierPart(a[i]))
System.out.println(a[i]
+ " may be part of java Identifier part.");
if (Character.isJavaIdentifierStart(a[i]))
System.out.println(a[i]
+ " may be part of java Identifier Start.");
if (Character.isUnicodeIdentifierPart(a[i]))
System.out.println(a[i]
+ " may be part of a Unicode identifier .");
if (Character.isUnicodeIdentifierStart(a[i]))
System.out
.println(a[i]
+ " may be the first character in a Unicode identifier.");
}
}
/**
* Called when an operand is expected next.
*
* @return one of:
* <UL>
* <LI>a {@link BigDecimal} value;
* <LI>the {@link String} name of a variable;
* <LI>{@link Tokeniser#START_NEW_EXPRESSION} when an opening parenthesis is found:
* <LI>or {@link Operator} when a unary operator is found in front of an operand
* </UL>
*
* @throws RuntimeException if the end of the string is reached unexpectedly.
*/
Object getOperand() {
/* Skip whitespace */
final int len = this.string.length();
char ch = 0;
while (this.position < len && Character.isWhitespace(ch = this.string.charAt(this.position))) {
this.position++;
}
if (this.position == len) {
throw new RuntimeException("operand expected but end of string found");
}
if (ch == '(') {
this.position++;
return START_NEW_EXPRESSION;
} else if (ch == '-') {
this.position++;
return Operator.NEG;
} else if (ch == '+') {
this.position++;
return Operator.PLUS;
} else if (ch == '.' || Character.isDigit(ch)) {
return getBigDecimal();
} else if (Character.isUnicodeIdentifierStart(ch)) {
int start = this.position++;
while (this.position < len
&& Character.isUnicodeIdentifierPart(this.string.charAt(this.position))) {
this.position++;
}
String name = this.string.substring(start, this.position);
/* Is variable name actually a keyword unary operator? */
if (name.equals("abs")) {
return Operator.ABS;
} else if (name.equals("int")) {
return Operator.INT;
} else if (name.equals("ln")) {
return Operator.LN;
}
/* Return variable name */
return name;
}
throw new RuntimeException("operand expected but '" + ch + "' found");
}
private void validateUserId(String uid) {
if (!User.userIdAvailable(uid)) {
addFieldError("username", getText("error.uid.unavailable", new String[] {uid}));
return;
}
int n = uid.length();
if (n > UID_MAX_LENGTH) {
addFieldError("username", getText("error.string.toolong", new String[] {uid}));
return;
}
char[] cs = uid.toCharArray();
for (int i = 0; i < n; i++) {
char c = cs[i];
// White space cannot be part of a valid uid!
if (Character.isWhitespace(c))
addFieldError(
"username",
"You chose '"
+ uid
+ "' as your username. Character '"
+ c
+ "' at position "
+ i
+ " cannot be used in a user name!");
// No special characters allowed!
if (((i == 0) && !Character.isUnicodeIdentifierStart(c))
|| ((i > 0) && !Character.isUnicodeIdentifierPart(c) && (c != '_'))) {
addFieldError(
"username",
"You chose '"
+ uid
+ " as your username. Character '"
+ c
+ "' at position "
+ i
+ " cannot be used in a user name! Start with a letter and use letters, numbers, or _ elsewhere!");
}
}
}
Operator getOperator(char endOfExpressionChar) {
/* Use any pushed back operator. */
if (this.pushedBackOperator != null) {
Operator operator = this.pushedBackOperator;
this.pushedBackOperator = null;
return operator;
}
/* Skip whitespace */
final int len = this.string.length();
char ch = 0;
while (this.position < len && Character.isWhitespace(ch = this.string.charAt(this.position))) {
this.position++;
}
if (this.position == len) {
if (endOfExpressionChar == 0) {
return Operator.END;
} else {
throw new RuntimeException("missing " + endOfExpressionChar);
}
}
this.position++;
if (ch == endOfExpressionChar) {
return Operator.END;
}
switch (ch) {
case '+':
{
return Operator.ADD;
}
case '-':
{
return Operator.SUB;
}
case '/':
{
return Operator.DIV;
}
case '%':
{
return Operator.REMAINDER;
}
case '*':
{
return Operator.MUL;
}
case '?':
{
return Operator.TERNARY;
}
case '>':
{
if (this.position < len && this.string.charAt(this.position) == '=') {
this.position++;
return Operator.GE;
}
return Operator.GT;
}
case '<':
{
if (this.position < len) {
switch (this.string.charAt(this.position)) {
case '=':
this.position++;
return Operator.LE;
case '>':
this.position++;
return Operator.NE;
}
}
return Operator.LT;
}
case '=':
{
if (this.position < len && this.string.charAt(this.position) == '=') {
this.position++;
return Operator.EQ;
}
throw new RuntimeException("use == for equality at position " + this.position);
}
case '!':
{
if (this.position < len && this.string.charAt(this.position) == '=') {
this.position++;
return Operator.NE;
}
throw new RuntimeException("use != or <> for inequality at position " + this.position);
}
case '&':
{
if (this.position < len && this.string.charAt(this.position) == '&') {
this.position++;
return Operator.AND;
}
throw new RuntimeException("use && for AND at position " + this.position);
}
case '|':
{
if (this.position < len && this.string.charAt(this.position) == '|') {
this.position++;
return Operator.OR;
}
throw new RuntimeException("use || for OR at position " + this.position);
}
default:
{
/* Is this an identifier name for an operator function? */
if (Character.isUnicodeIdentifierStart(ch)) {
int start = this.position - 1;
while (this.position < len
&& Character.isUnicodeIdentifierPart(this.string.charAt(this.position))) {
this.position++;
}
String name = this.string.substring(start, this.position);
if (name.equals("pow")) {
return Operator.POW;
}
if (name.equals("spt")) {
return Operator.SPT;
}
}
throw new RuntimeException(
"operator expected at position " + this.position + " instead of '" + ch + "'");
}
}
}
/** Computes the next token. */
private Token fetchToken() throws OffsetLimitReachedException {
while (true) {
final int start = fOffset;
final int c = fCharPhase3;
final int d = nextCharPhase3();
switch (c) {
case END_OF_INPUT:
return newToken(IToken.tEND_OF_INPUT, start);
case '\n':
fInsideIncludeDirective = false;
return newToken(Lexer.tNEWLINE, start);
case ' ':
case '\t':
case 0xb: // vertical tab
case '\f':
case '\r':
continue;
case 'L':
switch (d) {
case 'R':
if (fOptions.fSupportRawStringLiterals) {
markPhase3();
if (nextCharPhase3() == '"') {
nextCharPhase3();
return rawStringLiteral(start, 3, IToken.tLSTRING);
}
restorePhase3();
}
break;
case '"':
nextCharPhase3();
return stringLiteral(start, 2, IToken.tLSTRING);
case '\'':
nextCharPhase3();
return charLiteral(start, IToken.tLCHAR);
}
return identifier(start, 1);
case 'u':
case 'U':
if (fOptions.fSupportUTFLiterals) {
switch (d) {
case 'R':
if (fOptions.fSupportRawStringLiterals) {
markPhase3();
if (nextCharPhase3() == '"') {
nextCharPhase3();
return rawStringLiteral(
start, 3, c == 'u' ? IToken.tUTF16STRING : IToken.tUTF32STRING);
}
restorePhase3();
}
break;
case '"':
nextCharPhase3();
return stringLiteral(
start, 2, c == 'u' ? IToken.tUTF16STRING : IToken.tUTF32STRING);
case '\'':
nextCharPhase3();
return charLiteral(start, c == 'u' ? IToken.tUTF16CHAR : IToken.tUTF32CHAR);
case '8':
if (c == 'u') {
markPhase3();
switch (nextCharPhase3()) {
case 'R':
if (fOptions.fSupportRawStringLiterals && nextCharPhase3() == '"') {
nextCharPhase3();
return rawStringLiteral(start, 4, IToken.tSTRING);
}
break;
case '"':
nextCharPhase3();
return stringLiteral(start, 3, IToken.tSTRING);
}
restorePhase3();
}
break;
}
}
return identifier(start, 1);
case 'R':
if (fOptions.fSupportRawStringLiterals && d == '"') {
nextCharPhase3();
return rawStringLiteral(start, 2, IToken.tSTRING);
}
return identifier(start, 1);
case '"':
if (fInsideIncludeDirective) {
return headerName(start, true);
}
return stringLiteral(start, 1, IToken.tSTRING);
case '\'':
return charLiteral(start, IToken.tCHAR);
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'S':
case 'T':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '_':
return identifier(start, 1);
case '$':
if (fOptions.fSupportDollarInIdentifiers) {
return identifier(start, 1);
}
break;
case '@':
if (fOptions.fSupportAtSignInIdentifiers) {
return identifier(start, 1);
}
break;
case '\\':
switch (d) {
case 'u':
case 'U':
nextCharPhase3();
return identifier(start, 2);
}
return newToken(tOTHER_CHARACTER, start, 1);
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return number(start, 1, false);
case '.':
switch (d) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
nextCharPhase3();
return number(start, 2, true);
case '.':
markPhase3();
if (nextCharPhase3() == '.') {
nextCharPhase3();
return newToken(IToken.tELLIPSIS, start);
}
restorePhase3();
break;
case '*':
nextCharPhase3();
return newToken(IToken.tDOTSTAR, start);
}
return newToken(IToken.tDOT, start);
case '#':
if (d == '#') {
nextCharPhase3();
return newToken(IToken.tPOUNDPOUND, start);
}
return newToken(IToken.tPOUND, start);
case '{':
return newToken(IToken.tLBRACE, start);
case '}':
return newToken(IToken.tRBRACE, start);
case '[':
return newToken(IToken.tLBRACKET, start);
case ']':
return newToken(IToken.tRBRACKET, start);
case '(':
return newToken(IToken.tLPAREN, start);
case ')':
return newToken(IToken.tRPAREN, start);
case ';':
return newToken(IToken.tSEMI, start);
case ':':
switch (d) {
case ':':
nextCharPhase3();
return newToken(IToken.tCOLONCOLON, start);
case '>':
nextCharPhase3();
return newDigraphToken(IToken.tRBRACKET, start);
}
return newToken(IToken.tCOLON, start);
case '?':
return newToken(IToken.tQUESTION, start);
case '+':
switch (d) {
case '+':
nextCharPhase3();
return newToken(IToken.tINCR, start);
case '=':
nextCharPhase3();
return newToken(IToken.tPLUSASSIGN, start);
}
return newToken(IToken.tPLUS, start);
case '-':
switch (d) {
case '>':
int e = nextCharPhase3();
if (e == '*') {
nextCharPhase3();
return newToken(IToken.tARROWSTAR, start);
}
return newToken(IToken.tARROW, start);
case '-':
nextCharPhase3();
return newToken(IToken.tDECR, start);
case '=':
nextCharPhase3();
return newToken(IToken.tMINUSASSIGN, start);
}
return newToken(IToken.tMINUS, start);
case '*':
if (d == '=') {
nextCharPhase3();
return newToken(IToken.tSTARASSIGN, start);
}
return newToken(IToken.tSTAR, start);
case '/':
switch (d) {
case '=':
nextCharPhase3();
return newToken(IToken.tDIVASSIGN, start);
case '/':
nextCharPhase3();
lineComment(start);
continue;
case '*':
blockComment(start, '*');
continue;
case '%':
if (fOptions.fSupportSlashPercentComments) {
blockComment(start, '%');
continue;
}
break;
}
return newToken(IToken.tDIV, start);
case '%':
switch (d) {
case '=':
nextCharPhase3();
return newToken(IToken.tMODASSIGN, start);
case '>':
nextCharPhase3();
return newDigraphToken(IToken.tRBRACE, start);
case ':':
final int e = nextCharPhase3();
if (e == '%') {
markPhase3();
if (nextCharPhase3() == ':') {
nextCharPhase3();
return newDigraphToken(IToken.tPOUNDPOUND, start);
}
restorePhase3();
}
return newDigraphToken(IToken.tPOUND, start);
}
return newToken(IToken.tMOD, start);
case '^':
if (d == '=') {
nextCharPhase3();
return newToken(IToken.tXORASSIGN, start);
}
return newToken(IToken.tXOR, start);
case '&':
switch (d) {
case '&':
nextCharPhase3();
return newToken(IToken.tAND, start);
case '=':
nextCharPhase3();
return newToken(IToken.tAMPERASSIGN, start);
}
return newToken(IToken.tAMPER, start);
case '|':
switch (d) {
case '|':
nextCharPhase3();
return newToken(IToken.tOR, start);
case '=':
nextCharPhase3();
return newToken(IToken.tBITORASSIGN, start);
}
return newToken(IToken.tBITOR, start);
case '~':
return newToken(IToken.tBITCOMPLEMENT, start);
case '!':
if (d == '=') {
nextCharPhase3();
return newToken(IToken.tNOTEQUAL, start);
}
return newToken(IToken.tNOT, start);
case '=':
if (d == '=') {
nextCharPhase3();
return newToken(IToken.tEQUAL, start);
}
return newToken(IToken.tASSIGN, start);
case '<':
if (fInsideIncludeDirective) {
return headerName(start, false);
}
switch (d) {
case '=':
nextCharPhase3();
return newToken(IToken.tLTEQUAL, start);
case '<':
final int e = nextCharPhase3();
if (e == '=') {
nextCharPhase3();
return newToken(IToken.tSHIFTLASSIGN, start);
}
return newToken(IToken.tSHIFTL, start);
case '?':
if (fOptions.fSupportMinAndMax) {
nextCharPhase3();
return newToken(IGCCToken.tMIN, start);
}
break;
case ':':
// 2.5-3
markPhase3();
if (nextCharPhase3() != ':') {
return newDigraphToken(IToken.tLBRACKET, start);
}
switch (nextCharPhase3()) {
case ':':
case '>':
restorePhase3();
nextCharPhase3();
return newDigraphToken(IToken.tLBRACKET, start);
}
restorePhase3();
break;
case '%':
nextCharPhase3();
return newDigraphToken(IToken.tLBRACE, start);
}
return newToken(IToken.tLT, start);
case '>':
switch (d) {
case '=':
nextCharPhase3();
return newToken(IToken.tGTEQUAL, start);
case '>':
final int e = nextCharPhase3();
if (e == '=') {
nextCharPhase3();
return newToken(IToken.tSHIFTRASSIGN, start);
}
return newToken(IToken.tSHIFTR, start);
case '?':
if (fOptions.fSupportMinAndMax) {
nextCharPhase3();
return newToken(IGCCToken.tMAX, start);
}
break;
}
return newToken(IToken.tGT, start);
case ',':
return newToken(IToken.tCOMMA, start);
default:
// in case we have some other letter to start an identifier
if (Character.isUnicodeIdentifierStart((char) c)) {
return identifier(start, 1);
}
break;
}
// handles for instance @
return newToken(tOTHER_CHARACTER, start, 1);
}
}
/**
* Returns a parser that produces a unicode identifier start character.
*
* @param missing The error if there is no character on the stream to produce a unicode
* identifier start character with.
* @param sat The error if the produced character is not a unicode identifier start character.
* @return A parser that produces a unicode identifier start character.
* @see Character#isUnicodeIdentifierStart(char)
*/
public static <E> Parser<Stream<Character>, Character, E> unicodeIdentiferStart(
final F0<E> missing, final F<Character, E> sat) {
return StreamParser.satisfy(missing, sat, c -> Character.isUnicodeIdentifierStart(c));
}