private AviatorObject getAviatorObjectFromToken(Token<?> lookhead) {
AviatorObject result = null;
switch (lookhead.getType()) {
case Number:
// load numbers
NumberToken numberToken = (NumberToken) lookhead;
if (numberToken.getNumber() instanceof Double) {
result = AviatorDouble.valueOf(numberToken.getNumber());
} else {
result = AviatorLong.valueOf(numberToken.getNumber());
}
break;
case String:
// load string
result = new AviatorString((String) lookhead.getValue(null));
break;
case Pattern:
// load pattern
result = new AviatorPattern((String) lookhead.getValue(null));
break;
case Variable:
if (lookhead == Variable.TRUE) {
result = AviatorBoolean.TRUE;
} else if (lookhead == Variable.FALSE) {
result = AviatorBoolean.FALSE;
} else if (lookhead == Variable.NIL) {
result = AviatorNil.NIL;
}
break;
case Char:
result = new AviatorString(String.valueOf(lookhead.getValue(null)));
break;
}
return result;
}
private int execute() {
int exeCount = 0;
final int size = this.tokenList.size();
this.printTokenList();
for (int i = 0; i < size; i++) {
Token<?> token = this.tokenList.get(i);
if (token.getType() == TokenType.Operator) {
final OperatorToken op = (OperatorToken) token;
final OperatorType operatorType = op.getOperatorType();
final int operandCount = operatorType.getOperandCount();
switch (operatorType) {
case FUNC:
case INDEX:
// Could not optimize function and index call
break;
default:
Map<Integer, DelegateTokenType> index2DelegateType =
this.getIndex2DelegateTypeMap(operatorType);
final int result =
this.executeOperator(i, operatorType, operandCount, index2DelegateType);
if (result < 0) {
this.compactTokenList();
return exeCount;
}
exeCount += result;
break;
}
}
}
this.compactTokenList();
return exeCount;
}
private void printTokenList() {
if (this.trace) {
for (Token<?> t : this.tokenList) {
System.out.print(t.getLexeme() + " ");
}
System.out.println();
}
}
private int executeOperator(
int operatorIndex,
final OperatorType operatorType,
int operandCount,
Map<Integer, DelegateTokenType> index2DelegateType) {
Token<?> token = null;
operandCount += index2DelegateType.size();
// check if literal expression can be executed
boolean canExecute = true;
// operand count
int count = 0;
// operand start index
int operandStartIndex = -1;
for (int j = operatorIndex - 1; j >= 0; j--) {
token = this.tokenList.get(j);
if (token == null) {
// we must compact token list and retry executing
return -1;
}
final TokenType tokenType = token.getType();
// Check if operand is a literal operand
if (!this.isLiteralOperand(token, tokenType, count + 1, index2DelegateType)) {
canExecute = false;
break;
}
count++;
if (count == operandCount) {
operandStartIndex = j;
break;
}
}
// if we can execute it on compile
if (canExecute) {
// arguments
AviatorObject[] args = new AviatorObject[operandCount];
int index = 0;
for (int j = operandStartIndex; j < operatorIndex; j++) {
token = this.tokenList.get(j);
if (token.getType() == TokenType.Delegate) {
this.tokenList.set(j, null);
continue;
}
args[index++] = this.getAviatorObjectFromToken(token);
// set argument token to null
this.tokenList.set(j, null);
}
// execute it now
AviatorObject result = operatorType.eval(args);
// set result as token to tokenList for next executing
this.tokenList.set(operatorIndex, this.getTokenFromOperand(result));
return 1;
}
return 0;
}
public void onArrayIndexStart(Token<?> lookhead) {
this.tokenList.add(
new DelegateToken(
lookhead == null ? -1 : lookhead.getStartIndex(),
lookhead,
DelegateTokenType.Index_Start));
}
public void onTernaryLeft(Token<?> lookhead) {
this.tokenList.add(
new DelegateToken(
lookhead == null ? -1 : lookhead.getStartIndex(),
lookhead,
DelegateTokenType.Ternary_Left));
}
public void onMethodParameter(Token<?> lookhead) {
this.tokenList.add(
new DelegateToken(
lookhead == null ? -1 : lookhead.getStartIndex(),
lookhead,
DelegateTokenType.Method_Param));
}
private boolean isLiteralToken(Token<?> token) {
switch (token.getType()) {
case Variable:
return token == Variable.TRUE || token == Variable.FALSE || token == Variable.NIL;
case Char:
case Number:
case Pattern:
case String:
return true;
}
return false;
}
public void onMethodInvoke(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.FUNC));
}
public void onBitXor(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.BIT_XOR));
}
public void onUnsignedShiftRight(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(
lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.U_SHIFT_RIGHT));
}
public void onShiftLeft(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(
lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.SHIFT_LEFT));
}
public void onTernaryRight(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.TERNARY));
}
public void onSub(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.SUB));
}
public void onJoinRight(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.OR));
}
public void onArrayIndexEnd(Token<?> lookhead) {
this.tokenList.add(
new OperatorToken(lookhead == null ? -1 : lookhead.getStartIndex(), OperatorType.INDEX));
}
public Expression getResult() {
// execute literal expression
while (this.execute() > 0) {;
}
Map<String, Integer /* counter */> variables = new LinkedHashMap<String, Integer>();
Map<String, Integer /* counter */> methods = new HashMap<String, Integer>();
for (Token<?> token : this.tokenList) {
switch (token.getType()) {
case Variable:
String varName = token.getLexeme();
if (!variables.containsKey(varName)) {
variables.put(varName, 1);
} else {
variables.put(varName, variables.get(varName) + 1);
}
break;
case Delegate:
DelegateToken delegateToken = (DelegateToken) token;
if (delegateToken.getDelegateTokenType() == DelegateTokenType.Method_Name) {
Token<?> realToken = delegateToken.getToken();
if (realToken.getType() == TokenType.Variable) {
String methodName = token.getLexeme();
if (!methods.containsKey(methodName)) {
methods.put(methodName, 1);
} else {
methods.put(methodName, methods.get(methodName) + 1);
}
}
} else if (delegateToken.getDelegateTokenType() == DelegateTokenType.Array) {
Token<?> realToken = delegateToken.getToken();
if (realToken.getType() == TokenType.Variable) {
varName = token.getLexeme();
if (!variables.containsKey(varName)) {
variables.put(varName, 1);
} else {
variables.put(varName, variables.get(varName) + 1);
}
}
}
break;
}
}
// call asm to generate byte codes
this.callASM(variables, methods);
// Last token is a literal token,then return a LiteralExpression
if (this.tokenList.size() <= 1) {
if (this.tokenList.isEmpty()) {
return new LiteralExpression(null, new ArrayList<String>(variables.keySet()));
}
final Token<?> lastToken = this.tokenList.get(0);
if (this.isLiteralToken(lastToken)) {
return new LiteralExpression(
this.getAviatorObjectFromToken(lastToken).getValue(null),
new ArrayList<String>(variables.keySet()));
}
}
// get result from asm
return this.asmCodeGenerator.getResult();
}
private void callASM(
Map<String, Integer /* counter */> variables, Map<String, Integer /* counter */> methods) {
this.asmCodeGenerator.initVariables(variables);
this.asmCodeGenerator.initMethods(methods);
this.asmCodeGenerator.start();
for (int i = 0; i < this.tokenList.size(); i++) {
Token<?> token = this.tokenList.get(i);
switch (token.getType()) {
case Operator:
OperatorToken op = (OperatorToken) token;
switch (op.getOperatorType()) {
case ADD:
this.asmCodeGenerator.onAdd(token);
break;
case SUB:
this.asmCodeGenerator.onSub(token);
break;
case MULT:
this.asmCodeGenerator.onMult(token);
break;
case DIV:
this.asmCodeGenerator.onDiv(token);
break;
case MOD:
this.asmCodeGenerator.onMod(token);
break;
case EQ:
this.asmCodeGenerator.onEq(token);
break;
case NEQ:
this.asmCodeGenerator.onNeq(token);
break;
case LT:
this.asmCodeGenerator.onLt(token);
break;
case LE:
this.asmCodeGenerator.onLe(token);
break;
case GT:
this.asmCodeGenerator.onGt(token);
break;
case GE:
this.asmCodeGenerator.onGe(token);
break;
case NOT:
this.asmCodeGenerator.onNot(token);
break;
case NEG:
this.asmCodeGenerator.onNeg(token);
break;
case AND:
this.asmCodeGenerator.onAndRight(token);
break;
case OR:
this.asmCodeGenerator.onJoinRight(token);
break;
case FUNC:
this.asmCodeGenerator.onMethodInvoke(token);
break;
case INDEX:
this.asmCodeGenerator.onArrayIndexEnd(token);
break;
case MATCH:
this.asmCodeGenerator.onMatch(token);
break;
case TERNARY:
this.asmCodeGenerator.onTernaryRight(token);
break;
case BIT_AND:
this.asmCodeGenerator.onBitAnd(token);
break;
case BIT_OR:
this.asmCodeGenerator.onBitOr(token);
break;
case BIT_XOR:
this.asmCodeGenerator.onBitXor(token);
break;
case BIT_NOT:
this.asmCodeGenerator.onBitNot(token);
break;
case SHIFT_LEFT:
this.asmCodeGenerator.onShiftLeft(token);
break;
case SHIFT_RIGHT:
this.asmCodeGenerator.onShiftRight(token);
break;
case U_SHIFT_RIGHT:
this.asmCodeGenerator.onUnsignedShiftRight(token);
break;
}
break;
case Delegate:
DelegateToken delegateToken = (DelegateToken) token;
final Token<?> realToken = delegateToken.getToken();
switch (delegateToken.getDelegateTokenType()) {
case And_Left:
this.asmCodeGenerator.onAndLeft(realToken);
break;
case Join_Left:
this.asmCodeGenerator.onJoinLeft(realToken);
break;
case Array:
this.asmCodeGenerator.onArray(realToken);
break;
case Index_Start:
this.asmCodeGenerator.onArrayIndexStart(realToken);
break;
case Ternary_Boolean:
this.asmCodeGenerator.onTernaryBoolean(realToken);
break;
case Ternary_Left:
this.asmCodeGenerator.onTernaryLeft(realToken);
break;
case Method_Name:
this.asmCodeGenerator.onMethodName(realToken);
break;
case Method_Param:
this.asmCodeGenerator.onMethodParameter(realToken);
break;
}
break;
default:
this.asmCodeGenerator.onConstant(token);
break;
}
}
}