CommandBuilder.cs

//Currently, the entire implementation of Commands/CommandBuilder.cs SUCKS MAJORLY!
//Basically, I assume that there are two commands: :l "path", and :s "path" (loadvars and savevars)
//In this case, a field is either 'l' or 's' and is in the beggining, and string comes directly afterwards.
//Yes, this sucks. Maybe I'll fix it if I ever feel like expanding commans.

using System;
using System.Text;
using System.Collections.Generic;

class CommandBuilder : IBuilder<string> {
    private char command;
    private List<double> args;

    public CommandBuilder() {
        args = new List<double>();
    }

    public string Number(string number) {
        return number;
    }

    public string Variable(string name) {
        return '$' + name;
    }

    public string Field(string name) {
        return name;
    }

    public string Assignment(LexType op, string name, string value) {
        return Scanner.OpNames[(int)op] + ' ' + name + ' ' + value;
    }

    public string String(string str) {
        return str;
        //throw new Exception("Strings are not (yet) allowed in command");
    }

    public string Function(string name, List<string> args) {
        int limit = 0;
        StringBuilder sb = new StringBuilder();
        sb.Append(name);
        while (limit < args.Count) {
            sb.Append(args[limit]);
            sb.Append(' ');
            limit++;
        }
        return sb.ToString();
    }

    public string Binary(LexType op, string left, string right) {
        return Scanner.OpNames[(int)op] + ' ' + left + ' ' + right;
    }

    public string Unary(LexType op, string expr) {
        switch (op) {
            case LexType.Minus:
            case LexType.Plus:
                return Scanner.OpNames[(int)op] + ' ' + expr;
            case LexType.Exclamation:
                return expr + '!';
            default:
                throw new Exception("Internal Error. Invalid unary operator.");
        }
    }

    public string End(string expr) {
        return expr;
    }
}