public void TestWhile()
{
var while_ = new While();
while_.Init(new Rel(new Token('>'), new Constant(42), new Constant(99)), new Stmt());
while_.Gen(10, 88);
//output:
// iffalse 42 > 99 goto L88
//L1: goto L 10
}
public void WhileCtorTest()
{
var variable = new Id(new Word("x", Tag.ID), VarType.INT, 0);
var constant = new Constant(new Num(12), VarType.INT);
var expresion = new Rel(Word.EQ, variable, constant);
var whilenode = new While();
whilenode.Init(expresion, new Stmt());
}
public void WhileGenTest()
{
using (var cout = new StringWriter())
{
Node.Cout = cout;
var variable = new Id(new Word("x", Tag.ID), VarType.INT, 0);
var constant = new Constant(new Num(12), VarType.INT);
var expresion = new Rel(Word.EQ, variable, constant);
var whilenode = new While();
whilenode.Init(expresion, new Stmt());
whilenode.Gen(11, 22);
var actual = cout.ToString();
Assert.AreEqual("\tiffalse x == 12 goto L22\r\nL1:\r\n\tgoto L11\r\n", actual);
}
}
public void BreakGenTest()
{
using (var cout = new StringWriter())
{
Node.Cout = cout;
var variable = new Id(new Word("x", Tag.ID), VarType.INT, 0);
var constant = new Constant(new Num(12), VarType.INT);
var expresion = new Rel(Word.EQ, variable, constant);
var whilenode = new While();
whilenode.Init(expresion, new Stmt());
Stmt.Enclosing = whilenode;
var breaknode = new Break();
breaknode.Gen(11, 22);
var actual = cout.ToString();
Assert.AreEqual("\tgoto L0\r\n", actual);
}
}
private Stmt stmt()
{
Expr x;
Stmt s1, s2;
Stmt saveStmt;
if (Except(Tag.IF))
{
ExceptGrammar(Tag.LeftPar);
x = Bool();
ExceptGrammar(Tag.RightPar);
s1 = stmt();
if (!Except(Tag.ELSE))
{
return(new If(x, s1));
}
s2 = stmt();
return(new Else(x, s1, s2));
}
else if (Except(Tag.WHILE))
{
While node = new While(look.Line);
saveStmt = Stmt.Encloseing;
Stmt.Encloseing = node;
ExceptGrammar(Tag.LeftPar); x = Bool(); ExceptGrammar(Tag.RightPar);
s1 = stmt();
node.Init(x, s1);
Stmt.Encloseing = saveStmt;
return(node);
}
else if (Except(Tag.DO))
{
Do node = new Do(look.Line);
saveStmt = Stmt.Encloseing;
Stmt.Encloseing = node;
s1 = stmt();
ExceptGrammar(Tag.WHILE); ExceptGrammar(Tag.LeftPar); x = Bool();
ExceptGrammar(Tag.RightPar);
node.Init(s1, x);
Stmt.Encloseing = saveStmt;
return(node);
}
else if (Except(Tag.DIM))
{
bool isStatic = Except(Tag.STATIC);
Word curName = look as Word;
ExceptGrammar(Tag.IDENTITY);
ExceptGrammar(Tag.AS);
Symbols.Type type = look as Symbols.Type;
ExceptGrammar(Tag.BASICTYPE);
if (Except(Tag.LeftBra))
{
// is array
dims(ref type, curName);
}
Id id = new Id(curName, top, type, used, isStatic);
top.Add(curName.lexeme, id);
used += type.Width;
if (Except(Tag.Equal))
{
//a init val
x = Bool();
return(new Set(id, x));
}
return(Stmt.Null);
}
else if (Except(Tag.RETURN))
{
Return ret;
if (reader.ReadLast().TokenTag != Tag.LINE_END)
{
ret = new Return(look.Line, Stmt.LastFunction as Function, Bool());
return(ret);
}
else
{
move();
return(new Return(look.Line));
}
}
else if (Except(Tag.BREAK))
{
return(new Break(look.Line));
}
else if (Except(Tag.CONTINUE))
{
return(new Continue(look.Line));
}
else if (Except(Tag.LeftBlock))
{
return(Block());
}
else
{
return(Assign());
}
}