本文整理汇总了C#中Tree.Node.eval方法的典型用法代码示例。如果您正苦于以下问题：C# Node.eval方法的具体用法？C# Node.eval怎么用？C# Node.eval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.eval方法的3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: checkTrue
public Boolean checkTrue(Node cond, Environment e)
{
Node check = cond.eval(cond, e);
if (check.isBool() == true)
{
BoolLit boolVal = (BoolLit) check;
return boolVal.getVal();
}
return true;
}示例2: apply2
private Node apply2(Node arg1, Node arg2)
{
string name = this.symbol.getName();
bool flag = name.Equals("eq?");
Node result;
if (flag)
{
bool flag2 = arg1.isSymbol() && arg2.isSymbol();
if (flag2)
{
string name2 = arg1.getName();
string name3 = arg2.getName();
result = BoolLit.getInstance(name2.Equals(name3));
}
else
{
result = BoolLit.getInstance(arg1 == arg2);
}
}
else
{
bool flag3 = name.Equals("cons");
if (flag3)
{
result = new Cons(arg1, arg2);
}
else
{
bool flag4 = name.Equals("set-car!");
if (flag4)
{
arg1.setCar(arg2);
result = Unspecific.getInstance();
}
else
{
bool flag5 = name.Equals("set-cdr!");
if (flag5)
{
arg1.setCdr(arg2);
result = Unspecific.getInstance();
}
else
{
bool flag6 = name.Equals("eval");
if (flag6)
{
bool flag7 = arg2.isEnvironment();
if (flag7)
{
result = arg1.eval((Environment)arg2);
}
else
{
Console.Error.WriteLine("Error: wrong type of argument");
result = Nil.getInstance();
}
}
else
{
bool flag8 = name.Equals("apply");
if (flag8)
{
result = arg1.apply(arg2);
}
else
{
bool flag9 = name[0] == 'b' && name.Length == 2;
if (flag9)
{
bool flag10 = arg1.isNumber() && arg2.isNumber();
if (flag10)
{
result = this.apply2(arg1.getIntVal(), arg2.getIntVal());
}
else
{
Console.Error.WriteLine("Error: invalid arguments");
result = Nil.getInstance();
}
}
else
{
Console.Error.WriteLine("Error: wrong number of arguments");
result = Nil.getInstance();
}
}
}
}
}
}
}
return result;
}示例3: Main
public static int Main(string[] args)
{
// Create scanner that reads from standard input
Scanner scanner = new Scanner(Console.In);
if (args.Length > 1 ||
(args.Length == 1 && ! args[0].Equals("-d")))
{
Console.Error.WriteLine("Usage: mono SPP [-d]");
return 1;
}
// If command line option -d is provided, debug the scanner.
if (args.Length == 1 && args[0].Equals("-d"))
{
// Console.Write("Scheme 4101> ");
Token tok = scanner.getNextToken();
while (tok != null)
{
TokenType tt = tok.getType();
Console.Write(tt);
if (tt == TokenType.INT)
Console.WriteLine(", intVal = " + tok.getIntVal());
else if (tt == TokenType.STRING)
Console.WriteLine(", stringVal = " + tok.getStringVal());
else if (tt == TokenType.IDENT)
Console.WriteLine(", name = " + tok.getName());
else
Console.WriteLine();
// Console.Write("Scheme 4101> ");
tok = scanner.getNextToken();
}
return 0;
}
// Create parser
TreeBuilder builder = new TreeBuilder();
Parser parser = new Parser(scanner, builder);
Node root = new Node();
// TODO: Create and populate the built-in environment and
// create the top-level environment
Tree.Environment env = new Tree.Environment();
Ident id = new Ident("b+");
env.define(id, new BuiltIn(id));
env = new Tree.Environment(env);
Ident test = new Ident("xxxx");
IntLit test2 = new IntLit(3);
env.define(test, test2);
root = (Node) parser.parseExp();
while (root != null)
{
root.eval(env).print(0);
root = (Node) parser.parseExp();
}
// Read-eval-print loop
// TODO: print prompt and evaluate the expression
/*
root = (Node) parser.parseExp();
while (root != null)
{
root.print(0);
root = (Node) parser.parseExp();
}
*/
return 0;
}