本文整理汇总了C#中Tree.Node.isNull方法的典型用法代码示例。如果您正苦于以下问题：C# Node.isNull方法的具体用法？C# Node.isNull怎么用？C# Node.isNull使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Tree.Node的用法示例。
在下文中一共展示了Node.isNull方法的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: pairup
//Function for pairing up arguments with corresponding symbols
private static void pairup(Node parms, Node args, Environment env)
{
//if null return nothing
if (parms.isNull() && args.isNull())
{
return;
}
//check the symbol type
if (parms.isSymbol())
{
env.define(parms, args);
}
//depending on the parameter, check the # of required valid arguments
else if (parms.isNull() || args.isNull())
{
Console.get_Error().WriteLine("Error: wrong number of arguments");
}
//look for values in different env w/ closure pointer? idk how to explain this
else if (parms.isPair() && args.isPair())
{
env.define(parms.getCar(), args.getCar());
Closure.pairup(parms.getCdr(), args.getCdr(), env);
}
else
{
Console.get_Error().WriteLine("Error: invalid expression");
}
}示例2: print
public override void print(Node t, int n, bool p)
{
var spaces = "";
if(n >= 0) spaces = new string(' ', n);
if(!p) { Console.Write(spaces+"("); p = true; }
n = 0;
do
{
t.getCar().print(n, false);
t = t.getCdr();
if(!t.isNull())
Console.Write(' ');
} while (t.getCdr() != null);
if (t.isPair() || t.isNull())
t.print(n, p);
else
{
Console.Write(". ");
t.print(n, p);
Console.Write(")");
}
}示例3: expLength
//obtain experession length of a statement
public static int expLength(Node exp)
{
if (exp.isNull())
return 0;
if (!exp.isPair())
return -1;
int num = Util.expLength(exp.getCdr());
if (num == -1)
return -1;
return num + 1;
}示例4: printVar
private static void printVar(Node t, int n, bool p)
{
string spaces = new string(' ', n);
if (!p) { Console.Write(spaces + "("); p = true; }
n = 0;
do
{
t.getCar().print(n, false);
t = t.getCdr();
if (!t.isNull())
Console.Write(' ');
} while (t.getCdr() != null);
t.print(n, p);
}示例5: define
//added from here and down, possible errors
private static int define(Node bind, Environment env, Environment lenv)
{
if (bind.isNull())
{
return 0;
}
Node car = bind.getCar();
if (Util.expLength(car) != 2)
{
return -1;
}
Node car2 = car.getCar(); // (car x)
Node value = car.getCdr().getCar().eval(env); //(eval (cadr x) env)
lenv.define(car2, value); // (list (car x) (eval (cadr x) env)))
return Let.define(bind.getCdr(), env, lenv);
}示例6: mapEval
//mapping element for evaluation, i think it's similar when you are trying to map some exp to a certain lambda
//Ex) (map (lambda (x) (* -1 x)) '(1 2 3 4))
//reference http://courses.cs.washington.edu/courses/cse341/02sp/scheme/apply-eval.html
public static Node mapEval(Node exp, Environment env)
{
if (exp.isNull())
return Nil.getInstance();
return new Cons(exp.getCar().eval(env), Util.mapEval(exp.getCdr(), env));
}示例7: apply1
//if arg's length = 1
private Node apply1(Node arg1)
{
string name = this.symbol.getName();
bool flag = name.Equals("car");
Node result;
if (flag)
{
result = arg1.getCar();
}//end if
else
{
bool flag2 = name.Equals("cdr");
if (flag2)
{
result = arg1.getCdr();
}//end if
else
{
bool flag3 = name.Equals("number?");
if (flag3)
{
result = BoolLit.getInstance(arg1.isNumber());
}//end if
else
{
bool flag4 = name.Equals("symbol?");
if (flag4)
{
result = BoolLit.getInstance(arg1.isSymbol());
}//end if
else
{
bool flag5 = name.Equals("null?");
if (flag5)
{
result = BoolLit.getInstance(arg1.isNull());
}//end if
else
{
bool flag6 = name.Equals("pair?");
if (flag6)
{
result = BoolLit.getInstance(arg1.isPair());
}//end if
else
{
bool flag7 = name.Equals("procedure?");
if (flag7)
{
result = BoolLit.getInstance(arg1.isProcedure());
}//end if
else
{
bool flag8 = name.Equals("write");// i am not sure if im handling this correctly
if (flag8)
{
arg1.print(-1);
result = Unspecific.getInstance();
}//end if
else
{
bool flag9 = name.Equals("display"); // i am not sure if im handling this correctly
if (flag9)
{
StringLit.printDoubleQuotes = false;
arg1.print(-1);
StringLit.printDoubleQuotes = true;
result = Unspecific.getInstance();
}//end if
else
{
bool flag10 = name.Equals("load");
if (flag10)
{
bool flag11 = !arg1.isString();
if (flag11)
{
Console.Error.WriteLine("Error: wrong type of argument");
result = Nil.getInstance();
}
else
{
string stringVal = arg1.getStringVal();
try
{
//not sure why it has to be Parse.Scanner to call this
Parse.Scanner s = new Parse.Scanner(File.OpenText(stringVal));
TreeBuilder b = new TreeBuilder();
Parse.Parser parser = new Parse.Parser(s, b);
for (Node node = (Node)parser.parseExp(); node != null; node = (Node)parser.parseExp())
{
node.eval(Scheme4101.env);
}
}
catch (SystemException)
{
Console.Error.WriteLine("Could not find file " + stringVal);
}
result = Unspecific.getInstance();
//.........这里部分代码省略.........
示例8: checkSymbols
//check if valid statement
private bool checkSymbols(Node parms)
{
return parms.isNull() || parms.isSymbol() || (parms.isPair() && parms.getCar().isSymbol() && this.checkSymbols(parms.getCdr()));
}