private BinaryOperatorExpression balanceBinaryExpression(SimpleExpression exp, Token.TokenValue op, BinaryOperatorExpression binExp)
{
if (tokenPriority(op) >= tokenPriority(binExp.op))
{
return new BinaryOperatorExpression(op, exp, binExp);
}
if (binExp.e1 is BinaryOperatorExpression)
{
return new BinaryOperatorExpression(binExp.op, balanceBinaryExpression(exp, op, (BinaryOperatorExpression)binExp.e1), binExp.e2);
}
return new BinaryOperatorExpression(binExp.op, new BinaryOperatorExpression(op, exp, binExp.e1), binExp.e2);
}
public ObjectExpression evalSimpleExpression(SimpleExpression exp)
{
if (exp is LiteralExpression)
{
lit = (LiteralExpression)exp;
switch (lit.value.type)
{
case ParserUtils.Token.TokenValue.STRING:
return new ObjectExpression(ObjectType.stringType, lit.value.stringValue);
case ParserUtils.Token.TokenValue.INT:
return new ObjectExpression(ObjectType.intType, lit.value.intValue);
case ParserUtils.Token.TokenValue.CHAR:
return new ObjectExpression(ObjectType.charType, lit.value.charValue);
case ParserUtils.Token.TokenValue.BOOLEAN:
return new ObjectExpression(ObjectType.booleanType, lit.value.booleanValue);
default:
break;
}
}
else if (exp is SubSimpleExpression)
{
return evalSimpleExpression(((SubSimpleExpression)exp).exp);
}
else if (exp is NullExpression)
{
return null;
}
else if (exp is BinaryOperatorExpression)
{
BinaryOperatorExpression binExp = (BinaryOperatorExpression)exp;
ObjectExpression oLeft = evalSimpleExpression(binExp.e1), oRight;
switch (binExp.op)
{
case ParserUtils.Token.TokenValue.AND:
if ((bool)oLeft.value)
{
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (bool)oRight.value);
}
return new ObjectExpression(ObjectType.booleanType, false);
case ParserUtils.Token.TokenValue.OR:
if ((bool)oLeft.value)
{
return new ObjectExpression(ObjectType.booleanType, true);
}
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (bool)oRight.value);
case ParserUtils.Token.TokenValue.PLUS:
oRight = evalSimpleExpression(binExp.e2);
if (oLeft.type == ObjectType.stringType || oRight.type == ObjectType.stringType)
{
return new ObjectExpression(ObjectType.stringType, oLeft.value.ToString() + oRight.value.ToString());
}
if (oLeft.type == ObjectType.intType && oRight.type == ObjectType.intType)
{
return new ObjectExpression(ObjectType.intType, (int)oLeft.value + (int)oRight.value);
}
break;
case ParserUtils.Token.TokenValue.MINUS:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.intType, (int)oLeft.value - (int)oRight.value);
case ParserUtils.Token.TokenValue.TIMES:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.intType, (int)oLeft.value * (int)oRight.value);
case ParserUtils.Token.TokenValue.DIV:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.intType, (int)oLeft.value / (int)oRight.value);
case ParserUtils.Token.TokenValue.LT:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (int)oLeft.value < (int)oRight.value);
case ParserUtils.Token.TokenValue.GT:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (int)oLeft.value > (int)oRight.value);
case ParserUtils.Token.TokenValue.LEQ:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (int)oLeft.value <= (int)oRight.value);
case ParserUtils.Token.TokenValue.GEQ:
oRight = evalSimpleExpression(binExp.e2);
return new ObjectExpression(ObjectType.booleanType, (int)oLeft.value >= (int)oRight.value);
case ParserUtils.Token.TokenValue.EQBOOL:
oRight = evalSimpleExpression(binExp.e2);
if (oLeft.type == ObjectType.intType)
{
return new ObjectExpression(ObjectType.booleanType, (int)oLeft.value == (int)oRight.value);
}
if (oLeft.type == ObjectType.stringType)
{
return new ObjectExpression(ObjectType.booleanType, ((string)oLeft.value).Equals((string)oRight.value));
}
if (oLeft.type == ObjectType.booleanType)
{
return new ObjectExpression(ObjectType.booleanType, (bool)oLeft.value == (bool)oRight.value);
}
if (oLeft.type == ObjectType.charType)
{
return new ObjectExpression(ObjectType.booleanType, (char)oLeft.value == (char)oRight.value);
}
break;
default:
break;
}
}
else if (exp is UnaryOperatorExpression)
{
unExp = (UnaryOperatorExpression)exp;
switch (unExp.op)
{
case ParserUtils.Token.TokenValue.NEG:
o1 = evalSimpleExpression(((UnaryOperatorExpression)exp).exp);
return new ObjectExpression(ObjectType.booleanType, !((bool)o1.value));
}
}
else if (exp is VariableExpression)
{
return variables[((VariableExpression)exp).name];
}
else if (exp is CharacterVariableExpression)
{
return new ObjectExpression(ObjectType.intType, IrisData.getPlayerVariable(((CharacterVariableExpression)exp).name));
}
return null;
}
public UnaryOperatorExpression(Token.TokenValue operatorToken, SimpleExpression expr)
{
op = operatorToken;
exp = expr;
}
public ElseIfExpression(SimpleExpression conditionIf, Expression corpsIf)
{
this.condition = conditionIf;
this.corps = corpsIf;
}
public BinaryOperatorExpression(Token.TokenValue opValue, SimpleExpression left, SimpleExpression right)
{
this.op = opValue;
this.e1 = left;
this.e2 = right;
}
public ValueExpression(ObjectType varType, string varName, SimpleExpression varValue)
{
this.type = varType;
this.name = varName;
this.value = varValue;
}
public IfExpression(SimpleExpression conditionIf, Expression ifBody)
{
this.condition = conditionIf;
this.body = ifBody;
}
public SubSimpleExpression(SimpleExpression e)
{
exp = e;
}
public AssignExpression(string varName, SimpleExpression varValue)
{
}