[6685] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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[6663] | 23 | using System.Collections.Generic;
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[6889] | 24 | using System.Globalization;
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[6663] | 25 | using System.Linq;
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| 26 | using System.Text.RegularExpressions;
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| 27 | using HeuristicLab.Common;
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| 28 | using HeuristicLab.Core;
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| 29 | using HeuristicLab.Data;
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| 30 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 31 |
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[6685] | 32 | namespace HeuristicLab.Optimization {
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| 33 |
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[6663] | 34 | [StorableClass]
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| 35 | public class Calculator : IDeepCloneable {
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| 36 |
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| 37 | #region Fields & Properties
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[6685] | 38 |
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[6663] | 39 | private List<string> tokens;
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| 40 |
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| 41 | [Storable]
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| 42 | public string Formula {
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| 43 | get { return string.Join(" ", tokens); }
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| 44 | set { tokens = Tokenize(value).ToList(); }
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| 45 | }
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| 46 |
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[6878] | 47 | private static readonly Regex TokenRegex =
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| 48 | new Regex(@"[a-zA-Z0-9._]+|""([^""]|\\"")*""|'([^']|\\')*'|[-+*/<>^]|dup|swap|drop|log|true|false|if|==|not|isnull|null|ismatch|rename");
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[6663] | 49 |
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| 50 | #endregion
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| 51 |
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| 52 | #region Construction & Cloning
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| 53 |
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| 54 | [StorableConstructor]
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| 55 | protected Calculator(bool deserializing) { }
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| 56 | public Calculator() { }
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[6878] | 57 | protected Calculator(Calculator original, Cloner cloner) {
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| 58 | cloner.RegisterClonedObject(original, this);
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[6889] | 59 | if (original.tokens != null)
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| 60 | tokens = original.tokens.ToList();
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[6663] | 61 | }
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| 62 | public IDeepCloneable Clone(Cloner cloner) {
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| 63 | return new Calculator(this, cloner);
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| 64 | }
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| 65 | public object Clone() {
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| 66 | return Clone(new Cloner());
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| 67 | }
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| 68 | #endregion
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| 69 |
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[6878] | 70 | private static IEnumerable<string> Tokenize(string s) {
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[6663] | 71 | return TokenRegex.Matches(s).Cast<Match>().Select(m => m.Value);
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| 72 | }
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| 73 |
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| 74 | public IItem GetValue(IDictionary<string, IItem> variables) {
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[6878] | 75 | var stack = new Stack<object>();
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| 76 | int i = 0;
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[6663] | 77 | try {
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[6878] | 78 | for (; i<tokens.Count; i++) {
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| 79 | var token = tokens[i];
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[6663] | 80 | double d;
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[6878] | 81 | if (TryParse(token, out d)) {
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[6663] | 82 | stack.Push(d);
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| 83 | } else if (token.StartsWith("\"")) {
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| 84 | stack.Push(GetVariableValue(variables, token.Substring(1, token.Length - 2).Replace(@"\""", @"""")));
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[6878] | 85 | } else if (token.StartsWith("'")) {
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| 86 | stack.Push(token.Substring(1, token.Length-2).Replace("\'", "'"));
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[6663] | 87 | } else {
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[6878] | 88 | Apply(token, stack, variables);
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[6663] | 89 | }
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| 90 | }
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[6878] | 91 | } catch (Exception x) {
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| 92 | throw new Exception(string.Format(
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| 93 | "Calculation Failed at token #{1}: '{2}' {0}current stack is: {0}{3}", Environment.NewLine,
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| 94 | i, tokens[i], string.Join(Environment.NewLine, stack.Select(AsString))),
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| 95 | x);
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[6663] | 96 | }
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[6878] | 97 | if (stack.Count != 1) throw new Exception(string.Format("Invalid final evaluation stack size {0} (should be 1)", stack.Count));
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| 98 | var result = stack.Pop();
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| 99 | if (result is string) return new StringValue((string)result);
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| 100 | if (result is double) return new DoubleValue((double)result);
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| 101 | if (result is bool) return new BoolValue((bool)result);
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| 102 | return null;
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[6685] | 103 | }
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[6878] | 104 |
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| 105 | private static void Apply(string token, Stack<object> stack, IDictionary<string, IItem> variables) {
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| 106 | switch (token) {
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| 107 | case "null": stack.Push(null); break;
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| 108 | case "true": stack.Push(true); break;
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| 109 | case "false": stack.Push(false); break;
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| 110 |
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| 111 | case "drop": stack.Pop(); break;
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| 112 | case "dup": stack.Push(stack.Peek()); break;
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| 113 | case "swap":
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| 114 | var top = stack.Pop();
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| 115 | var next = stack.Pop();
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| 116 | stack.Push(top);
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| 117 | stack.Push(next);
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| 118 | break;
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| 119 |
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| 120 | case "log": Apply(stack, x => Math.Log((double)x)); break;
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| 121 | case "+": Apply(stack, (x, y) => (double)x + (double)y); break;
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| 122 | case "-": Apply(stack, (x, y) => (double)x - (double)y); break;
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| 123 | case "*": Apply(stack, (x, y) => (double)x * (double)y); break;
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| 124 | case "/": Apply(stack, (x, y) => (double)x / (double)y); break;
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| 125 | case "^": Apply(stack, (x, y) => Math.Pow((double)x, (double)y)); break;
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| 126 | case "<": Apply(stack, (x, y) => (double)x < (double)y); break;
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| 127 | case ">": Apply(stack, (x, y) => (double)x > (double)y); break;
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| 128 |
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| 129 | case "==": Apply(stack, (x, y) => Equal(x, y)); break;
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| 130 | case "not": Apply(stack, x => !(bool)x); break;
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| 131 | case "isnull": Apply(stack, x => x == null); break;
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| 132 | case "if": Apply(stack, (then, else_, cond) => (bool)cond ? then : else_); break;
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| 133 |
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| 134 | case "ismatch": Apply(stack, (s, p) => new Regex((string)p).IsMatch((string)s)); break;
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| 135 | case "rename": Apply(stack, (s, p, r) => new Regex((string)p).Replace((string)s, (string)r)); break;
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| 136 |
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| 137 | default: stack.Push(GetVariableValue(variables, token)); break;
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| 138 | }
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| 139 | }
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| 140 |
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| 141 | #region Auxiliary Functions
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| 142 |
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| 143 | #region IItem value conversion
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| 144 | private static object GetIntValue(IItem value) {
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| 145 | var v = value as IntValue;
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| 146 | if (v != null) return (double)v.Value;
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| 147 | return null;
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| 148 | }
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| 149 |
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| 150 | private static object GetDoubleValue(IItem value) {
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| 151 | var v = value as DoubleValue;
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| 152 | if (v != null) return v.Value;
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| 153 | return null;
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| 154 | }
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| 155 |
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| 156 | private static object GetBoolValue(IItem value) {
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| 157 | var v = value as BoolValue;
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| 158 | if (v != null) return v.Value;
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| 159 | return null;
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| 160 | }
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| 161 |
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| 162 | private static object GetVariableValue(IDictionary<string, IItem> variables, string name) {
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| 163 | if (variables.ContainsKey(name)) {
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| 164 | var item = variables[name];
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| 165 | return
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| 166 | GetIntValue(item) ??
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| 167 | GetDoubleValue(item) ??
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| 168 | GetBoolValue(item) ??
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| 169 | item.ToString();
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| 170 | }
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| 171 | return null;
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| 172 | }
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| 173 | #endregion
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| 174 |
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| 175 | #region variadic equality
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| 176 | private static bool Equal(object a, object b) { return EqualNumber(a, b) || EqualBool(a, b) || EqualString(a, b) || a == b; }
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| 177 | private static bool EqualNumber(object a, object b) { return a is double && b is double && (double)a == (double)b; }
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| 178 | private static bool EqualBool(object a, object b) { return a is bool && b is bool && (bool)a == (bool)b; }
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| 179 | private static bool EqualString(object a, object b) { return a is string && b is string && ((string)a).Equals((string)b); }
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| 180 | #endregion
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| 181 |
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| 182 | #region stack calculation
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| 183 | private static void Apply(Stack<object> stack, Func<object, object> func) {
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| 184 | if (stack.Count < 1)
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| 185 | throw new InvalidOperationException("Stack is empty");
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| 186 | var a = stack.Pop();
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| 187 | try {
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| 188 | stack.Push(func(a));
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| 189 | } catch (Exception) {
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| 190 | stack.Push(a);
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| 191 | throw;
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| 192 | }
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| 193 | }
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| 194 |
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| 195 | private static void Apply(Stack<object> stack, Func<object, object, object> func) {
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| 196 | if (stack.Count < 2)
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| 197 | throw new InvalidOperationException("Stack contains less than two elements");
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| 198 | var b = stack.Pop();
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| 199 | var a = stack.Pop();
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| 200 | try {
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| 201 | stack.Push(func(a, b));
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| 202 | } catch (Exception) {
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| 203 | stack.Push(b);
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| 204 | stack.Push(a);
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| 205 | throw;
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | private static void Apply(Stack<object> stack, Func<object, object, object, object> func) {
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| 210 | if (stack.Count < 3)
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| 211 | throw new InvalidOperationException("Stack contains less than three elements");
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| 212 | var c = stack.Pop();
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| 213 | var b = stack.Pop();
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| 214 | var a = stack.Pop();
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| 215 | try {
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| 216 | stack.Push(func(a, b, c));
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| 217 | } catch (Exception) {
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| 218 | stack.Push(a);
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| 219 | stack.Push(b);
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| 220 | stack.Push(c);
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| 221 | throw;
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| 222 | }
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| 223 | }
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| 224 | #endregion
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| 225 |
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| 226 | private static bool TryParse(string token, out double d) {
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| 227 | return double.TryParse(token,
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| 228 | NumberStyles.AllowDecimalPoint |
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| 229 | NumberStyles.AllowExponent |
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| 230 | NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture, out d);
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| 231 | }
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| 232 |
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| 233 | private static string AsString(object o) {
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| 234 | if (o == null) return "null";
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| 235 | if (o is string) return string.Format("'{0}'", o);
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| 236 | return o.ToString();
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| 237 | }
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| 238 |
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| 239 | #endregion
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[6663] | 240 | }
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| 241 | }
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