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using System;
using System.Collections.Generic;
using System.Linq;
using DSALibv.Auxiliary.Calculator;
namespace DSALib.Auxiliary.Calculator
{
/// <summary>
/// The StringSolver divides the calculation string into operations and SubStringSolvers if the string contains
/// parentheses
/// </summary>
public class StringSolver : ISolvable
{
private readonly List<object> arguments = new List<object>();
private readonly string input;
public StringSolver(string input)
{
this.input = input;
}
public int Solve()
{
var workInput = "0+" + input.Replace(" ", string.Empty).ToLower();
workInput = ExpandParentheses(workInput);
// Create a List of the different parts of the calculation, e.g.:{"0", "+", "(5+6)", "d", "3"}.
AtomizeOperations(workInput);
// traverse the List in order of Operation to Create the binary operation tree .
NestOperations();
// the List now contains only the top operation node, witch can be solved recursively,
return ((ISolvable) arguments.First()).Solve();
}
public override string ToString()
{
return "(0+" + input.Replace(" ", string.Empty).ToLower() + ")";
}
private static string
GetInner(ref string input) // extract the inner bracket an remove the section from the input string
{
var depth = 0;
for (var index = 1; index < input.Length; index++)
{
var c = input[index];
switch (c)
{
case '(':
depth++;
break;
case ')':
if (depth == 0)
{
var split = input.Substring(1, index - 1);
input = input.Substring(index + 1);
return split.Equals(string.Empty) ? "0" : split;
}
else
{
depth--;
}
break;
}
}
throw new ArgumentException("Invalid brace sequence");
}
private static Ops GetOps(char c)
{
switch (c)
{
case 'd':
case 'w':
return Ops.Dice;
case '+':
return Ops.Add;
case '-':
return Ops.Subtract;
case '*':
return Ops.Multiply;
default:
return Ops.Multiply;
}
}
private static string ExpandParentheses(string input) // insert * between Parentheses and digits
{
for (var i = 0; i < input.Length - 1; i++)
if (input[i + 1] == '(' && char.IsNumber(input[i]))
input = input.Insert(i + 1, "*");
for (var i = 1; i < input.Length; i++)
if (input[i - 1] == ')' && char.IsNumber(input[i]))
input = input.Insert(i, "*");
return input;
}
private void AtomizeOperations(string workInput)
{
for (var index = 0; index < workInput.Length; index++)
{
var c = workInput[index];
if (char.IsNumber(c))
{
// if char number, check if at end of string, else continue looping
if (index == workInput.Length - 1)
// if at end of string; add remaining number to arguments
arguments.Add(new Argument(workInput.Substring(0, index + 1)));
continue;
}
switch (c)
{
case ')':
throw new ArgumentException("Invalid brace sequence");
case '(':
arguments.Add(new StringSolver(GetInner(ref workInput)));
index = -1;
break;
default:
if (index > 0) arguments.Add(new Argument(workInput.Substring(0, index)));
arguments.Add(GetOps(c));
workInput = workInput.Remove(0, index + 1);
index = -1;
break;
}
}
}
private void NestOperations()
{
foreach (Ops currentOp in Enum.GetValues(typeof(Ops)))
// cycle through operators in operational order
for (var index = 0; index < arguments.Count; index++)
{
var arg = arguments[index];
if (arg.GetType() != typeof(Ops)) continue;
// arg is of type Ops
var op = (Ops) arg;
if (op != currentOp) continue;
// arg describes the current operation
HandleSpecialFormatting(ref index, op); // Deal with special needs...
// replace the previous current and next Element in the List with one Operation object
var temp = new Operator((ISolvable) arguments[index - 1], (ISolvable) arguments[index + 1], op);
arguments[index - 1] = temp;
arguments.RemoveRange(index, 2);
index--;
}
}
private void HandleSpecialFormatting(ref int index, Ops op)
{
var arg1 = arguments[index - 1];
if (arg1.GetType() == typeof(Ops))
{
if (op == Ops.Dice) arguments.Insert(index++, new Argument("1")); // w6 -> 1w6
if (op == Ops.Subtract) arguments.Insert(index++, new Argument("0")); // +-3 -> +0-3
}
var arg2 = arguments[index + 1]; // 3+-5 -> 3+(0-5)
if (arg2.GetType() == typeof(Ops))
{
arguments[index + 1] = new Operator(new Argument("0"), (ISolvable) arguments[index + 2], (Ops) arg2);
arguments.RemoveAt(index + 2);
}
}
}
}
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