public void ForStmt()
{
var s = @"
for a := 2; a < 10; a := a + 1
begin
write a
end";
var expected = new List <BaseAST>
{
new ForStmtAST(new Branch(
new BinaryExprAST(ASTType.LessThan, new VariableExprAST("a"), new IntExprAST(10)),
new BlockExprAST(new List <BaseAST>
{
new WriteStmtAST(new VariableExprAST("a"))
}
)),
new AssignStmtAST("a", new IntExprAST(2)),
new AssignStmtAST("a", new BinaryExprAST(
ASTType.Add,
new VariableExprAST("a"),
new IntExprAST(1)
))
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void OnlyIf()
{
var s = "if 2<3 then 2 end";
var expected = new List <BaseAST>
{
new IfStmtAST(
new List <Branch>
{
new Branch(
new BinaryExprAST(
ASTType.LessThan,
new IntExprAST(2),
new IntExprAST(3)
),
new List <BaseAST>
{
new FloatExprAST(2.3),
new VariableExprAST("a")
}.ToBlock()
)
}, null
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void RepeatStmt()
{
var s = @"
repeat
/*
Comment
*/
a := 3; // 233
// 456
4
until true";
var expected = new List <BaseAST>
{
new RepeatStmtAST(new Branch(
new BoolExprAST(true),
new BlockExprAST(new List <BaseAST>
{
new AssignStmtAST("a", new IntExprAST(3)),
new IntExprAST(4)
}
))
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void WriteStmt()
{
var s = "write a";
var expected = new List <BaseAST> {
new WriteStmtAST(new VariableExprAST("a"))
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void ReadStmt()
{
var s = "read a";
var expected = new List <BaseAST> {
new ReadStmtAST("a", TypeKind.Int)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void Assign()
{
var s = "a := 3";
var expected = new List <BaseAST>
{
new AssignStmtAST(
"a",
new IntExprAST(3)
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void Compare()
{
var s = "a >= 3";
var expected = new List <BaseAST>
{
new BinaryExprAST(
ASTType.GreaterEqual,
new VariableExprAST("a"),
new IntExprAST(3)
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void MultiLine()
{
var s = @"
a;
12";
var expected = new List <BaseAST>
{
new VariableExprAST("a"),
new IntExprAST(12)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void Nested_If()
{
var s = @"
if true then
if false then
write 4
else
write 5
end
end";
var expected = new List <BaseAST>
{
new IfStmtAST(
new List <Branch>
{
new Branch(
new BoolExprAST(true),
new List <BaseAST>
{
new IfStmtAST(
new List <Branch>
{
new Branch(
new BoolExprAST(false),
new List <BaseAST>
{
new WriteStmtAST(new IntExprAST(4))
}.ToBlock()
)
},
new ElseBranch(
new List <BaseAST>
{
new WriteStmtAST(new IntExprAST(5))
}.ToBlock()
)
)
}.ToBlock()
)
}, null
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void SingleLine()
{
var s = "a2a*(133+2.3);12";
var expected = new List <BaseAST>
{
new BinaryExprAST(
ASTType.Multiply,
new VariableExprAST("a2a"),
new BinaryExprAST(
ASTType.Add,
new IntExprAST(133),
new FloatExprAST(2.3)
)
),
new IntExprAST(12)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void AndOr()
{
var s = "a >= 2 && true || false";
var expected = new List <BaseAST>
{
new BinaryExprAST(
ASTType.Or,
new BinaryExprAST(
ASTType.And,
new BinaryExprAST(
ASTType.GreaterEqual,
new VariableExprAST("a"),
new IntExprAST(2)
),
new BoolExprAST(true)
),
new BoolExprAST(false)
)
};
Assert.AreEqual(expected, LangParser.ParseAll(s));
}
public void AtLeastOneStmt()
{
var s = @"";
Assert.Throws <ParseException>(() => LangParser.ParseAll(s));
}
private void CheckIt(string s) => _checker.Visit(LangParser.ParseAll(s));