1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Globalization;
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4 | using System.Text.RegularExpressions;
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5 |
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6 | namespace HeuristicLab.Problems.DataAnalysis {
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7 | public static class IntervalConstraintsParser {
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8 | public static IEnumerable<IntervalConstraint> Parse(string input) {
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9 | var options = RegexOptions.Multiline | RegexOptions.IgnoreCase;
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10 | var matches = Regex.Matches(input, @"^(.*)\bin\b\s*([\[\]])(.*[^\s])(\s*\.\.\s*)([^\s].*)([\[\]])\n*\r*\s*$", options);
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11 |
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12 | for (var i = 0; i < matches.Count; ++i) {
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13 | if (matches[i].Groups.Count == 7) {
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14 | var intervalConstraint = new IntervalConstraint();
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15 | //pattern 1 = defintion
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16 | var definition = Regex.Replace(matches[i].Groups[1].Value, @"\s *", "");
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17 | if (Regex.IsMatch(definition, @"\/")) {
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18 | var splitted = Regex.Split(definition.Replace(" ", string.Empty), @"\/");
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19 | var match = Regex.Match(splitted[0], @"([d∂])([0-9]|[²³])?(.*[^\s*])");
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20 | if (match.Success) {
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21 | intervalConstraint.NumberOfDerivation = match.Groups[2].Success ? ParseDerivationCount(match.Groups[2].Value) : 1;
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22 | intervalConstraint.Definition = match.Groups[3].Value;
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23 | intervalConstraint.IsDerivation = true;
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24 | var formulation = Regex.Match(splitted[1], @"([d∂])(.*[^²³])([²³])?");
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25 | if (formulation.Success) {
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26 | intervalConstraint.Variable = formulation.Groups[2].Success ? formulation.Groups[2].Value : "";
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27 | }
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28 | } else {
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29 | throw new ArgumentException($"An error occured in the derivation part: {splitted[0]}");
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30 | }
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31 | } else {
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32 | intervalConstraint.Definition = Regex.Match(definition, @".*[^.\s]*").Value;
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33 | intervalConstraint.IsDerivation = false;
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34 | }
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35 | intervalConstraint.Expression = matches[i].Groups[0].Value.Trim(' ', '\t', '\n', '\r');
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36 | intervalConstraint.InclusiveLowerBound = (matches[i].Groups[2].Value == "[");
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37 | intervalConstraint.InclusiveUpperBound = (matches[i].Groups[6].Value == "]");
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38 | intervalConstraint.Interval = new Interval(ParseIntervalBounds(matches[i].Groups[3].Value.Replace(" ", string.Empty)),
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39 | ParseIntervalBounds(matches[i].Groups[5].Value.Replace(" ", string.Empty)));
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40 |
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41 | yield return intervalConstraint;
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42 | } else {
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43 | throw new ArgumentException($"The given constraint: {matches[i].Value} is not valid.");
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44 | }
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45 | }
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46 | }
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47 |
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48 | private static double ParseIntervalBounds(string input) {
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49 | input = input.ToLower();
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50 | switch (input) {
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51 | case "+inf.":
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52 | case "inf.":
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53 | return double.PositiveInfinity;
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54 | case "-inf.":
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55 | return double.NegativeInfinity;
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56 | default: {
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57 | if (double.TryParse(input, NumberStyles.Any, CultureInfo.InvariantCulture, out var value)) {
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58 | return value;
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59 | } else {
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60 | throw new ArgumentException("The given Interval in the constraint is not valid.");
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61 | }
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62 | }
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63 | }
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64 | }
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65 |
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66 | private static int ParseDerivationCount(string input) {
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67 | switch (input) {
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68 | case "²":
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69 | return 2;
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70 | case "³":
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71 | return 3;
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72 | default:
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73 | int.TryParse(input, out var value);
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74 | return value;
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75 | }
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76 | }
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77 | }
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78 | }
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