1 | #region License Information
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2 |
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3 | /* HeuristicLab
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4 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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5 | *
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6 | * This file is part of HeuristicLab.
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7 | *
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8 | * HeuristicLab is free software: you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation, either version 3 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * HeuristicLab is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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20 | */
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21 |
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22 | #endregion
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23 |
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24 | using System;
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25 | using System.Collections.Generic;
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26 | using System.Globalization;
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27 | using System.Linq;
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28 | using System.Text.RegularExpressions;
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29 |
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30 | namespace HeuristicLab.Problems.DataAnalysis {
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31 | public static class IntervalConstraintsParser {
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32 | public static IEnumerable<IntervalConstraint> ParseInput(string inputText, string target,
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33 | IEnumerable<string> variables) {
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34 | if (string.IsNullOrEmpty(inputText)) throw new ArgumentNullException("No input text has been provided.");
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35 | if (string.IsNullOrEmpty(target)) throw new ArgumentNullException("No target variable has been provided.");
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36 | if (variables == null) throw new ArgumentNullException("No variables have been provided.");
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37 | if (!variables.Any()) throw new ArgumentException("Variables are empty.");
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38 |
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39 | var lines = inputText.Split(new[] {"\r\n", "\r", "\n"}, StringSplitOptions.None);
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40 | foreach (var line in lines) {
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41 | var trimmedLine = line.TrimStart();
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42 | //Check for target-variable constraint
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43 | if (trimmedLine.StartsWith("Target:")) {
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44 | var start = "Target:".Length;
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45 | var end = trimmedLine.Length;
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46 | var targetConstraint = trimmedLine.Substring(start, end - start);
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47 |
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48 | var match =
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49 | Regex.Match(targetConstraint,
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50 | @"(['](.*)[']|(.*[^\s]))" +
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51 | @"\s*(\bin\b)" +
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52 | @"\s*([\[])" +
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53 | @"\s*(\S*)" + // 6: interval lower bound
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54 | @"\s*(\.{2})" +
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55 | @"\s*(\S*)" + // 8: interval upper bound
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56 | @"\s*([\]])" +
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57 | @"(" +
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58 | @"\s*,\s*(\S*)\s*=\s*" + // 11: variable name
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59 | @"([(])\s*" +
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60 | @"(\S*)\s*" + // 13: region lower bound
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61 | @"(\.{2})\s*" +
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62 | @"(\S*)\s*" + // 15: region upper bound
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63 | @"([)])" +
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64 | @")*");
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65 |
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66 | if (match.Success) {
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67 | if (match.Groups.Count < 9) throw new ArgumentException("The target-constraint is not complete.", line);
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68 |
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69 | var targetVariable = match.Groups[1].Value.Trim();
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70 | if (targetVariable.StartsWith("'") && targetVariable.EndsWith("'"))
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71 | targetVariable = targetVariable.Substring(1, targetVariable.Length - 2);
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72 |
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73 | if (targetVariable != target)
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74 | throw new
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75 | ArgumentException($"The target variable {targetVariable} does not match the provided target {target}.",
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76 | line);
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77 |
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78 | var lowerBound = ParseIntervalBounds(match.Groups[6].Value);
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79 | var upperBound = ParseIntervalBounds(match.Groups[8].Value);
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80 | var expression = "Target:" + match.Groups[0].Value;
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81 | var parsedTarget = match.Groups[1].Value.Trim();
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82 | var variable = targetVariable;
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83 | var isEnabled = true;
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84 | var numberOfDerivation = 0;
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85 | var interval = new Interval(lowerBound, upperBound);
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86 |
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87 | if (match.Groups[10].Success)
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88 | {
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89 | IDictionary<string, Interval> pairs = new Dictionary<string, Interval>();
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90 | // option variables found
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91 | for(int idx = 0; idx < match.Groups[10].Captures.Count; ++idx)
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92 | {
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93 | var inputVar = match.Groups[11].Captures[idx].Value;
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94 | var regionLb = ParseIntervalBounds(match.Groups[13].Captures[idx].Value);
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95 | var regionUb = ParseIntervalBounds(match.Groups[15].Captures[idx].Value);
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96 | pairs.Add(inputVar, new Interval(regionLb, regionUb));
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97 | }
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98 | yield return new IntervalConstraint(expression, variable, parsedTarget, numberOfDerivation, interval, pairs, isEnabled);
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99 | }
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100 | else
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101 | {
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102 | yield return new IntervalConstraint(expression, variable, parsedTarget, numberOfDerivation, interval, isEnabled);
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103 | }
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104 | }
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105 | else {
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106 | throw new ArgumentException("The inserted target constraint is not valid.", line);
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107 | }
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108 |
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109 | //Check for derivation
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110 | }
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111 | else if (trimmedLine.StartsWith("d") || trimmedLine.StartsWith("\u2202")) {
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112 | var match = Regex.Match(trimmedLine,
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113 | @"([d∂])" +
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114 | @"([²³]?)\s*" +
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115 | @"(['](.*)[']|(.*[^\s]))\s*" +
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116 | @"(\/)\s*" +
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117 | @"([d∂])\s*" +
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118 | @"(['](.*)[']|(.*[^\s²³]))\s*" +
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119 | @"([²³]?)\s*\bin\b\s*" +
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120 | @"([\[])\s*" +
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121 | @"(\S*)\s*" +
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122 | @"(\.{2})\s*" +
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123 | @"(\S*)\s*" +
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124 | @"([\]])" +
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125 | @"(" +
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126 | @"\s*,\s*(\S*)\s*=\s*" + // 18: variable name
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127 | @"([(])\s*" +
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128 | @"(\S*)\s*" + // 20: region lower bound
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129 | @"(\.{2})\s*" +
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130 | @"(\S*)\s*" + // 22: region upper bound
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131 | @"([)])" +
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132 | @")*");
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133 |
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134 | if (match.Success) {
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135 | if (match.Groups.Count < 24)
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136 | throw new ArgumentException("The given derivation-constraint is not complete.", line);
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137 |
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138 | var derivationTarget = match.Groups[3].Value.Trim();
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139 | var derivationVariable = match.Groups[8].Value.Trim();
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140 |
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141 | if (match.Groups[3].Value.Trim().StartsWith("'") && match.Groups[3].Value.Trim().EndsWith("'"))
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142 | derivationTarget = derivationTarget.Substring(1, derivationTarget.Length - 2);
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143 |
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144 | if (match.Groups[8].Value.Trim().StartsWith("'") && match.Groups[8].Value.Trim().EndsWith("'"))
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145 | derivationVariable = derivationVariable.Substring(1, derivationVariable.Length - 2);
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146 |
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147 | if (derivationTarget != target)
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148 | throw new
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149 | ArgumentException($"The target variable {derivationTarget} does not match the provided target {target}.",
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150 | line);
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151 |
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152 | if (variables.All(v => v != derivationVariable))
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153 | throw new ArgumentException($"The given variable {derivationVariable} does not exist in the dataset.",
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154 | line);
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155 |
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156 | if (match.Groups[2].Value.Trim() != "" || match.Groups[11].Value.Trim() != "") {
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157 | if (match.Groups[2].Value.Trim() == "" || match.Groups[11].Value.Trim() == "")
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158 | throw new ArgumentException("Number of derivation has to be written on both sides.", line);
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159 | if (match.Groups[2].Value.Trim() != match.Groups[11].Value.Trim())
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160 | throw new ArgumentException("Derivation number is not equal on both sides.", line);
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161 | }
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162 |
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163 | var lowerBound = ParseIntervalBounds(match.Groups[13].Value);
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164 | var upperBound = ParseIntervalBounds(match.Groups[15].Value);
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165 | var expression = match.Groups[0].Value;
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166 | var parsedTarget = derivationTarget;
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167 | var isEnabled = true;
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168 | var variable = derivationVariable;
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169 | var numberOfDerivation = ParseDerivationCount(match.Groups[2].Value.Trim());
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170 | var interval = new Interval(lowerBound, upperBound);
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171 |
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172 | if(match.Groups[17].Success)
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173 | {
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174 | IDictionary<string, Interval> pairs = new Dictionary<string, Interval>();
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175 | // option variables found
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176 | for (int idx = 0; idx < match.Groups[17].Captures.Count; ++idx)
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177 | {
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178 | var inputVar = match.Groups[18].Captures[idx].Value;
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179 | var regionLb = ParseIntervalBounds(match.Groups[20].Captures[idx].Value);
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180 | var regionUb = ParseIntervalBounds(match.Groups[22].Captures[idx].Value);
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181 | pairs.Add(inputVar, new Interval(regionLb, regionUb));
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182 | }
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183 | yield return new IntervalConstraint(expression, variable, parsedTarget, numberOfDerivation, interval, pairs, isEnabled);
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184 | } else {
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185 | yield return new IntervalConstraint(expression, variable, parsedTarget, numberOfDerivation, interval, isEnabled);
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186 | }
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187 | }
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188 | else {
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189 | throw new ArgumentException("The inserted derivation constraint is not valid.", line);
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190 | }
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191 |
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192 | //Check for comment
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193 | }
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194 | else if (trimmedLine.StartsWith("#") || trimmedLine == "") {
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195 | //If it is a comment just continue without saving anything
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196 | }
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197 | else {
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198 | throw new
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199 | ArgumentException("Error at your constraints definition constraints have to start with (Target: | d | \u2202 | #)",
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200 | line);
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201 | }
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202 | }
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203 | }
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204 |
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205 | private static double ParseIntervalBounds(string input) {
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206 | input = input.ToLower();
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207 | switch (input) {
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208 | case "+inf.":
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209 | case "inf.":
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210 | return double.PositiveInfinity;
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211 | case "-inf.":
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212 | return double.NegativeInfinity;
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213 | default: {
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214 | if (double.TryParse(input, NumberStyles.Any, CultureInfo.InvariantCulture, out var value))
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215 | return value;
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216 | throw new ArgumentException("The given boundary is not a double value!");
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217 | }
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218 | }
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219 | }
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220 |
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221 | private static int ParseDerivationCount(string input) {
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222 | switch (input) {
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223 | case "":
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224 | return 1;
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225 | case "²":
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226 | return 2;
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227 | case "³":
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228 | return 3;
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229 | default:
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230 | int.TryParse(input, out var value);
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231 | return value;
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232 | }
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233 | }
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234 | }
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235 | } |
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