//Assign from a string.
Rational& Rational::operator=(const string input) {
int pos = input.find('/');
//Find the '/', or exit if invalid.
if(pos > input.size()) {
cout << "Invalid program string input. Creating whole number fraction.\n";
makeThis(parseStr(input), 1);
return *this;
}
//Send the string chunks off for processing.
makeThis( parseStr(input.substr( 0, pos )), parseStr(input.substr( (pos + 1), (input.size() - (pos + 1)) )) );
return *this;
}
AstNode *
makeObject()
{
AstNode *object;
AstNode *equMeth,
*construct,
*destruct;
AstNode *declator,
*fparam;
AstNode *ret,
*eq;
Literal *classLit,
*oLit,
*equalsLit;
/*
* Build the
* int equals(Object o) { return this == o; }
* method.
*/
classLit = makeLiteral(OBJECT_NAME, 0);
oLit = makeLiteral("o", 0);
fparam = makeFormalParam(makeNameId(classLit), makeNameId(oLit), 0);
equalsLit = makeLiteral("equals", 0);
declator = makeMethDeclator(makeNameId(equalsLit), makeSeq(fparam), 0);
eq = makeBinaryOp(EQU_OP, makeThis(0), makeExprId(oLit), 0);
ret = makeReturnSt(eq, 0);
equMeth = makeMethDecl(makeInt(0), declator, makeSeq(ret), 0);
/*
* Build
* Object() { return; }
* constructor
*/
declator = makeConstDeclator(makeNameId(classLit), NULL, 0);
construct = makeConstDecl(declator, makeSeq(makeReturnSt(NULL, 0)), 0);
/*
* Build
* ~Object() { return; }
* destructor
*/
destruct = makeDestructor(makeNameId(classLit),
makeSeq(makeReturnSt(NULL, 0)), 0);
/*
* Link the class all together.
*/
object = makeClass(makeNameId(classLit), NULL,
appendSeq(appendSeq(makeSeq(equMeth),
makeSeq(construct)),
makeSeq(destruct)), 0);
return object;
}
//Assign from an integer.
Rational& Rational::operator=(const int rhs) {
makeThis(rhs, 1);
return *this;
}
//Assign from another Rational.
Rational& Rational::operator=(const Rational &rhs) {
//Check for self-assignment
if (this != &rhs) makeThis(rhs.num, rhs.dem);
return *this;
}
//Copy Constructor
Rational::Rational(const Rational &input) {
makeThis(input.num, input.dem);
return;
}
//Full Constructor
Rational::Rational(int top, int bot) {
makeThis(top, bot);
return;
}
//Half Constructor
Rational::Rational(int top) {
makeThis(top, 1);
return;
}
//Default Constructor
Rational::Rational() {
makeThis(0, 1);
return;
}
