'Engine.old' as the folder name says.
This commit is contained in:
+642
@@ -0,0 +1,642 @@
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace Engine
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{
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public partial class Form1 : Form
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{
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//Invert over all expression (i + 7) ^ 2 -> -(i + 7) ^ 2
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private Stack<Node> Tree = new Stack<Node>();
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private Dictionary<string, double> Symbols = new Dictionary<string, double>();
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public Form1()
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{
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InitializeComponent();
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}
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private void Button1_Click(object sender, EventArgs e)
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{
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var s = textBox1.Text;
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var f = FlattenInput(s);
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PrintFlatList(f);
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f.Reverse();
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var stack = new Stack<Token>(f);
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ActionsListView.Items.Clear();
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button1.Text = "Result: " + NewCalc(stack);
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//var f2 = GetSubExpressions(f);
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//PrintSteps(f2);
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//PrintSymbolsTable();
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//var result = Calc(f2);
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//button1.Text = $"Result: {result}";
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//var result = Calc(FlattenInput(s));
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}
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void PrintSteps(List<List<Node>> expressions)
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{
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StepsListView.Items.Clear();
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for(var i = 0; i < expressions.Count; i++)
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{
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var expression = expressions[i];
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var item = new ListViewItem($"Step {i + 1}");
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var ex = string.Empty;
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foreach (var token in expression)
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{
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if (!token.IsCoefficent)
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ex += token.Value + " ";
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else
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ex += token.Value;
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}
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item.SubItems.Add(ex);
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StepsListView.Items.Add(item);
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}
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}
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void PrintSymbolsTable()
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{
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SymbolsListView.Items.Clear();
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foreach(var k in Symbols)
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{
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var item = new ListViewItem(k.Key);
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item.SubItems.Add(k.Value.ToString());
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SymbolsListView.Items.Add(item);
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}
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}
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void PrintFlatList(List<Token> tokens)
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{
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ExpressionBreakdownListView.Items.Clear();
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foreach(var token in tokens)
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{
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var item = new ListViewItem(token.Value);
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if(!token.IsCoefficent) item.SubItems.Add(token.Type.ToString());
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else item.SubItems.Add(token.Type.ToString() + " (Coefficent)");
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ExpressionBreakdownListView.Items.Add(item);
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}
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}
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double NewCalc(Stack<Token> tokens, double co = 1)
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{
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var previousToken = new Token() { Type = TokenType.Unknown };
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var runningValue = 0d;
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while(tokens.Count > 0)
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{
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var token = tokens.Pop();
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if (token.Type == TokenType.ExpEnd)
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{
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if(tokens.Count > 0 && tokens.Peek().Type == TokenType.Power)
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{
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var op = tokens.Pop();
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var powerOf = tokens.Pop();
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if(powerOf.Type == TokenType.Constant)
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{
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ActionsListView.Items.Add($"Taking {runningValue} to the power of {powerOf.Value}.");
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runningValue = Operate(runningValue, Convert.ToDouble(powerOf.Value), op.Type);
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}
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}
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break;
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}
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if(token.Type == TokenType.ExpStart)
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{
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runningValue = NewCalc(tokens);
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continue;
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}
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if(token.IsCoefficent)
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{
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var lookAHead = tokens.Pop();
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if (lookAHead.Type == TokenType.Variable)
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{
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ActionsListView.Items.Add($"{token.Value} is a coeffiecent, multiplying it against {Symbols[lookAHead.Value]} (Symbol '{lookAHead.Value}').");
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runningValue += Convert.ToDouble(token.Value) * Symbols[lookAHead.Value];
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if (previousToken.Type != TokenType.Unknown) throw new Exception("Token shouldn't have a valid value!");
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//2a(
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if(tokens.Count != 0 && tokens.Peek().Type == TokenType.ExpStart)
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{
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runningValue += NewCalc(tokens, runningValue);
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}
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previousToken = new Token() { Type = TokenType.Constant, Value = runningValue.ToString(), IsCoefficent = false };
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continue;
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}
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else if (lookAHead.Type == TokenType.ExpStart)
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{
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runningValue += NewCalc(tokens, Convert.ToDouble(token.Value));
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previousToken = new Token() { Type = TokenType.Constant, Value = runningValue.ToString(), IsCoefficent = false };
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continue;
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}
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else throw new Exception("Invalid grammar!");
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}
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//If token is an operator
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if(GetOperator(token.Value[0]) != TokenType.Unknown)
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{
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//Operator found
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var lookAHead = tokens.Pop();
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if(lookAHead.Type == TokenType.Constant && !lookAHead.IsCoefficent)
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{
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var tmpValue = 0d;
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while (tokens.Count > 0 && (tokens.Peek().Type == TokenType.Multiply || tokens.Peek().Type == TokenType.Divide || tokens.Peek().Type == TokenType.Power))
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{
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var op = tokens.Pop();
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if (op.Type != TokenType.Power)
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{
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var next = tokens.Pop();
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if (next.Type == TokenType.ExpStart)
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{
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var returnValue = NewCalc(tokens);
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if (tmpValue != 0)
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(op.Type)} {tmpValue} (tmp) and {returnValue} (returnValue).");
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tmpValue = Operate(tmpValue, returnValue, op.Type);
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lookAHead.Value = tmpValue.ToString();
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}
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else
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(op.Type)} {Convert.ToDouble(lookAHead.Value) * co} (lookAHead) and {returnValue} (returnValue).");
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tmpValue = Operate(Convert.ToDouble(lookAHead.Value) * co, returnValue, op.Type);
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lookAHead.Value = tmpValue.ToString();
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}
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continue;
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}
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if (tmpValue != 0)
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(op.Type)} {tmpValue} (tmp) and {Convert.ToDouble(next.Value) * co} (next).");
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tmpValue = Operate(tmpValue, Convert.ToDouble(next.Value) * co, op.Type);
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lookAHead.Value = tmpValue.ToString();
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}
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else
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(op.Type)} {Convert.ToDouble(lookAHead.Value) *co} (lookAHead) and {next.Value} (next).");
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tmpValue = Operate(Convert.ToDouble(lookAHead.Value) *co, Convert.ToDouble(next.Value) *co, op.Type);
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lookAHead.Value = tmpValue.ToString();
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}
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}
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else if (op.Type == TokenType.Power)
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{
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}
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}
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//if(tokens.Count > 0 && (tokens.Peek().Type == TokenType.Divide || tokens.Peek().Type == TokenType.Multiply || tokens.Peek().Type == TokenType.Power))
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//{
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// var op = tokens.Pop();
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// var con = tokens.Pop();
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// //TODO: check if "con" is a variable, right now we're assuming its a constant.
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// ActionsListView.Items.Add($"{GetOperatorVerb(op.Type)} {Convert.ToDouble(lookAHead.Value) * co} and {Convert.ToDouble(con.Value) * co} (Oder of Operations).");
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// var tmp = Operate(Convert.ToDouble(lookAHead.Value) * co, Convert.ToDouble(con.Value) * co, op.Type);
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// ActionsListView.Items.Add($"{GetOperatorVerb(token.Type)} {Convert.ToDouble(previousToken.Value) * co} and {tmp}.");
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// runningValue += Operate(Convert.ToDouble(previousToken.Value) * co, tmp, token.Type);
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// previousToken = new Token { Type = TokenType.Unknown };
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//}
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//else
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//{
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if (previousToken.Type != TokenType.Unknown)
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(token.Type)} {Convert.ToDouble(previousToken.Value) * co} and {Convert.ToDouble(lookAHead.Value) * co}.");
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runningValue += Operate(Convert.ToDouble(previousToken.Value) * co, Convert.ToDouble(lookAHead.Value) * co, token.Type);
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}
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else
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{
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ActionsListView.Items.Add($"{GetOperatorVerb(token.Type)} {runningValue} and {Convert.ToDouble(lookAHead.Value) * co}.");
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runningValue = Operate(runningValue, Convert.ToDouble(lookAHead.Value) * co, token.Type);
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}
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//}
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}
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}
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else if(token.Type == TokenType.Constant)
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{
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previousToken = token;
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}
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}
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return runningValue;
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}
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List<List<Node>> GetSubExpressions(List<Node> tokens)
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{
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var expressions = new List<List<Node>>();
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var stack = new Stack<List<Node>>();
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var tmp = new List<Node>();
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var skipCount = 0;
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var nestingLevel = 0;
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for(var i = 0; i < tokens.Count; i++)
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{
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if(skipCount > 0)
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{
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skipCount--;
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continue;
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}
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var token = tokens[i];
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//if (stack.Count > 0 && nestingLevel == 0)
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//{
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// if (!stack.Peek()[0].IsCoefficent)
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// {
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// var offset = 0;
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// while(stack.Count > 0)
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// {
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// expressions.Insert(0, stack.Pop());
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// offset++;
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// }
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// }
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//}
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if (token.IsCoefficent)
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{
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//var lookAhead = tokens[i + 1];
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//if(lookAhead.Type != Node.Token.ExpStart)
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//{
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if (tmp.Count > 0) expressions.Add(new List<Node>(tmp));
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expressions.Add(new List<Node>() { token });
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//}
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//else
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//{
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// stack.Push(new List<Node>(tmp));
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//}
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tmp.Clear();
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}
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else if (token.Type == Node.Token.ExpStart)
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{
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nestingLevel++;
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//if (i - 1 >= 0)
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//{
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// var lookBehind = tokens[i - 1];
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// if (lookBehind.IsCoefficent)
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// {
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// tmp.Remove(tmp.Last());
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// expressions.Add(new List<Node>(tmp));
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// tmp.Clear();
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// stack.Push(new List<Node> { lookBehind });
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// //tmp.Add(token);
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// continue;
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// }
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//}
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if (tmp.Count > 0) expressions.Add(new List<Node>(tmp));
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tmp.Clear();
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tmp.Add(token);
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}
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else if(token.Type == Node.Token.ExpEnd)
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{
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nestingLevel--;
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if (i + 1 < tokens.Count)
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{
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var lookAHead = tokens[i + 1];
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if (lookAHead.Type == Node.Token.Power)
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{
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var toPowerOf = tokens[i + 2];
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tmp.Add(token);
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tmp.Add(lookAHead);
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tmp.Add(toPowerOf);
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expressions.Add(new List<Node>(tmp));
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tmp.Clear();
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skipCount = 2;
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continue;
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}
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}
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tmp.Add(token);
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if (tmp.Count > 0) expressions.Add(new List<Node>(tmp));
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tmp.Clear();
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}
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else
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{
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tmp.Add(token);
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}
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}
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if(tmp.Count > 0)
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{
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expressions.Add(new List<Node>(tmp));
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}
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return expressions;
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}
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List<Token> FlattenInput(string expression)
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{
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//if (expression.Count(x => x == '(') == 1 && expression.Count(x => x == ')') == 1) throw new Exception("Unbalanced params!");
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//if(expression.Count(x => x == '(') % 2 != 0 || expression.Count(x => x == ')') % 2 != 0) throw new Exception("Unbalanced params!");
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Symbols.Clear();
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var tokens = new List<Token>();
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var tmp = string.Empty;
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var parsingNumber = false;
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for(var i = 0; i < expression.Length; i++)
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{
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var c = expression[i];
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var op = GetOperator(c);
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if (c == '.' || int.TryParse(c.ToString(), out int _))
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{
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if(tokens.Count > 1)
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{
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var lookBehind = tokens[tokens.Count - 1];
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if(lookBehind.Type == TokenType.ExpEnd)
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{
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tokens.Add(new Token() { Value = "^", Type = TokenType.Power, IsCoefficent = false });
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}
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}
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if((i + 1) == expression.Length)
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{
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tokens.Add(new Token() { Value = $"{tmp}{c}", Type = TokenType.Constant, IsCoefficent = false });//new Node($"{tmp}{c}", Node.Token.Constant));
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}
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parsingNumber = true;
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tmp += c;
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continue;
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}
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else if(c == '(')
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{
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if (parsingNumber)
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{
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tokens.Add(new Token() { Value = tmp, Type = TokenType.Constant, IsCoefficent = true });//new Node(tmp, Node.Token.Constant) { IsCoefficent = true });
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}
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tokens.Add(new Token() { Value = "(", Type = TokenType.ExpStart, IsCoefficent = false });//new Node("(", Node.Token.ExpStart));
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parsingNumber = false;
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tmp = string.Empty;
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continue;
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}
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else if(c == ')')
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{
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if (parsingNumber)
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{
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tokens.Add(new Token() { Value = tmp, Type = TokenType.Constant, IsCoefficent = false }); //new Node(tmp, Node.Token.Constant));
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}
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tokens.Add(new Token() { Value = ")", Type = TokenType.ExpEnd, IsCoefficent = false }); //new Node(c.ToString(), Node.Token.ExpEnd));
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parsingNumber = false;
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tmp = string.Empty;
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continue;
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}
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else if(op != TokenType.Unknown)
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{
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if(parsingNumber)
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{
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tokens.Add(new Token() { Value = tmp, Type = TokenType.Constant, IsCoefficent = false }); //new Node(tmp, Node.Token.Constant));
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}
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tokens.Add(new Token() { Value = c.ToString(), Type = op, IsCoefficent = false });//new Node(c.ToString(), op));
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parsingNumber = false;
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tmp = string.Empty;
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continue;
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}
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else if(c != ' ')
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{
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if (!Symbols.ContainsKey(c.ToString()))
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{
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Symbols.Add(c.ToString(), 1);
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}
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else
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{
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Symbols[c.ToString()]++;
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}
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if (tokens.Count > 1)
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{
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var lookBehind = tokens[tokens.Count - 1];
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if (lookBehind.Type == TokenType.ExpEnd)
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{
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tokens.Add(new Token() { Value = "^", Type = TokenType.Power, IsCoefficent = false });//new Node("^", Node.Token.Power));
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}
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}
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if ((i + 1) < expression.Length)
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{
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var lookAHead = expression[i + 1];
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if(lookAHead == '(')
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{
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tokens.Add(new Token() { Value = c.ToString(), Type = TokenType.Variable, IsCoefficent = true });
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tmp = string.Empty;
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parsingNumber = false;
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continue;
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}
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}
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if (parsingNumber)
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{
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tokens.Add(new Token() {Value = tmp, Type = TokenType.Constant, IsCoefficent = true });
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}
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tokens.Add(new Token() { Value = c.ToString(), Type = TokenType.Variable, IsCoefficent = false });
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parsingNumber = false;
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tmp = string.Empty;
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}
|
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}
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return tokens;
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}
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//double Calc(List<List<Node>> expressions, double co = 1)
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//{
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// //Assumption: an operator is never last in the list.
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// //double runningTotal = 0;
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// double lastValue = 0;
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// var next = true;
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// Node previousToken = new Node("zzzz", Node.Token.Unknown);
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|
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// for(var i = 0; i < expressions.Count;)
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// {
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// if (!next) break;
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|
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// var tokens = expressions[i];
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// expressions.RemoveAt(i);
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// for (var j = 0; j < tokens.Count; j++)
|
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// {
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// var token = tokens[j];
|
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|
||||
// if(token.IsCoefficent)
|
||||
// {
|
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// if(tokens.Count == 1)
|
||||
// {
|
||||
// return Calc(expressions, Convert.ToDouble(token.Value));
|
||||
// }
|
||||
// }
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// else if(token.Type == Node.Token.Constant)
|
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// {
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// previousToken = token;
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||||
// }
|
||||
// else if(token.Type == Node.Token.Variable)
|
||||
// {
|
||||
// //TODO: do symbol lookup to get value for this variale.
|
||||
// previousToken = new Node("666", Node.Token.Variable);
|
||||
// }
|
||||
// else if(GetOperator(token.Value[0]) != Node.Token.Unknown)
|
||||
// {
|
||||
// if(tokens.Count > j + 1)
|
||||
// {
|
||||
// j++;
|
||||
// var lookAHead = tokens[j];
|
||||
|
||||
// if(lookAHead.Type == Node.Token.Constant)
|
||||
// {
|
||||
// if (previousToken.Type != Node.Token.Unknown)
|
||||
// {
|
||||
// lastValue = Operate(Convert.ToDouble(previousToken.Value) * co, Convert.ToDouble(lookAHead.Value) * co, token.Type);
|
||||
// previousToken = new Node("zzzz", Node.Token.Unknown);
|
||||
// }
|
||||
// else
|
||||
// lastValue = Operate(lastValue * co, Convert.ToDouble(lookAHead.Value) * co, token.Type);
|
||||
// }
|
||||
// }
|
||||
// else
|
||||
// {
|
||||
// lastValue = Operate(Convert.ToDouble(previousToken.Value), Calc(expressions), token.Type);
|
||||
// }
|
||||
// }
|
||||
// else if(token.Type == Node.Token.ExpStart)
|
||||
// {
|
||||
|
||||
// }
|
||||
// else if(token.Type == Node.Token.ExpEnd)
|
||||
// {
|
||||
// if(tokens.Count > j + 1)
|
||||
// {
|
||||
// var lookAHead = tokens[j + 1];
|
||||
|
||||
// if(lookAHead.Type == Node.Token.Power)
|
||||
// {
|
||||
// lookAHead = tokens[j + 2];
|
||||
// lastValue = Operate(lastValue, Convert.ToDouble(lookAHead.Value), Node.Token.Power);
|
||||
// }
|
||||
// }
|
||||
|
||||
// next = false;
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
|
||||
// return lastValue;
|
||||
//}
|
||||
|
||||
double Operate(double n1, double n2, TokenType operation)
|
||||
{
|
||||
switch(operation)
|
||||
{
|
||||
case TokenType.Add:
|
||||
return n1 + n2;
|
||||
case TokenType.Divide:
|
||||
return n1 / n2;
|
||||
case TokenType.Multiply:
|
||||
return n1 * n2;
|
||||
case TokenType.Power:
|
||||
return Math.Pow(n1, n2);
|
||||
case TokenType.Subtract:
|
||||
return n1 - n2;
|
||||
default:
|
||||
throw new Exception("Token must be an operator!");
|
||||
}
|
||||
}
|
||||
|
||||
TokenType GetOperator(char c)
|
||||
{
|
||||
switch (c)
|
||||
{
|
||||
case '+':
|
||||
return TokenType.Add;
|
||||
case '-':
|
||||
return TokenType.Subtract;
|
||||
case '*':
|
||||
return TokenType.Multiply;
|
||||
case '^':
|
||||
return TokenType.Power;
|
||||
case '/':
|
||||
return TokenType.Divide;
|
||||
default:
|
||||
return TokenType.Unknown;
|
||||
}
|
||||
}
|
||||
|
||||
string GetOperatorVerb(TokenType type)
|
||||
{
|
||||
switch (type)
|
||||
{
|
||||
case TokenType.Add:
|
||||
return "Adding";
|
||||
case TokenType.Divide:
|
||||
return "Dividing";
|
||||
case TokenType.Multiply:
|
||||
return "Multiplying";
|
||||
case TokenType.Power:
|
||||
return "Raising";
|
||||
case TokenType.Subtract:
|
||||
return "Subtracting";
|
||||
default:
|
||||
throw new Exception("Token must be an operator!");
|
||||
}
|
||||
}
|
||||
|
||||
struct Token
|
||||
{
|
||||
public string Value;
|
||||
public bool IsCoefficent;
|
||||
public TokenType Type;
|
||||
}
|
||||
|
||||
enum TokenType
|
||||
{
|
||||
Add,
|
||||
Subtract,
|
||||
Multiply,
|
||||
Divide,
|
||||
Power,
|
||||
Variable,
|
||||
Constant,
|
||||
ExpStart,
|
||||
ExpEnd,
|
||||
SubScript,
|
||||
SuperScript,
|
||||
Unknown
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user