Begin web Hue

DO NOT USE!!


Former-commit-id: 9466e13485c2523873b7beac1f71e3bf240158b6
Former-commit-id: 61d543966d54b52225fb08a4b4add733b6ad2012

src/ImageProcessor.Web/Processors/Hue.cs

@@ -0,0 +1,150 @@
+namespace ImageProcessor.Web.Processors
+{
+    using System;
+    using System.Drawing;
+    using System.Globalization;
+    using System.Text;
+    using System.Text.RegularExpressions;
+
+    using ImageProcessor.Processors;
+    using ImageProcessor.Web.Extensions;
+
+    public class Hue : IWebGraphicsProcessor
+    {
+        /// <summary>
+        /// The regular expression to search strings for.
+        /// </summary>
+        private static readonly Regex QueryRegex = new Regex(@"(hue=|pixelrect=)[^&]+", RegexOptions.Compiled);
+
+        /// <summary>
+        /// The pixel regex.
+        /// </summary>
+        private static readonly Regex PixelRegex = new Regex(@"pixelate=\d+", RegexOptions.Compiled);
+
+        /// <summary>
+        /// The rectangle regex.
+        /// </summary>
+        private static readonly Regex RectangleRegex = new Regex(@"pixelrect=\d+,\d+,\d+,\d+", RegexOptions.Compiled);
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Hue"/> class.
+        /// </summary>
+        public Hue()
+        {
+            this.Processor = new ImageProcessor.Processors.Hue();
+        }
+
+        /// <summary>
+        /// Gets the regular expression to search strings for.
+        /// </summary>
+        public Regex RegexPattern
+        {
+            get
+            {
+                return QueryRegex;
+            }
+        }
+
+        /// <summary>
+        /// Gets the order in which this processor is to be used in a chain.
+        /// </summary>
+        public int SortOrder { get; private set; }
+
+        /// <summary>
+        /// Gets the associated graphics processor.
+        /// </summary>
+        public IGraphicsProcessor Processor { get; private set; }
+
+        /// <summary>
+        /// The position in the original string where the first character of the captured substring was found.
+        /// </summary>
+        /// <param name="queryString">The query string to search.</param>
+        /// <returns>
+        /// The zero-based starting position in the original string where the captured substring was found.
+        /// </returns>
+        public int MatchRegexIndex(string queryString)
+        {
+            int index = 0;
+
+            // Set the sort order to max to allow filtering.
+            this.SortOrder = int.MaxValue;
+
+            // First merge the matches so we can parse .
+            StringBuilder stringBuilder = new StringBuilder();
+
+            foreach (Match match in this.RegexPattern.Matches(queryString))
+            {
+                if (match.Success)
+                {
+                    if (index == 0)
+                    {
+                        // Set the index on the first instance only.
+                        this.SortOrder = match.Index;
+                    }
+
+                    stringBuilder.Append(match.Value);
+
+                    index += 1;
+                }
+            }
+
+            if (this.SortOrder < int.MaxValue)
+            {
+                // Match syntax
+                string toParse = stringBuilder.ToString();
+                int size = this.ParseSize(toParse);
+                Rectangle? rectangle = this.ParseRectangle(toParse);
+                this.Processor.DynamicParameter = new Tuple<int, Rectangle?>(size, rectangle);
+            }
+
+            return this.SortOrder;
+        }
+
+        /// <summary>
+        /// Returns the correct size of pixels.
+        /// </summary>
+        /// <param name="input">
+        /// The input containing the value to parse.
+        /// </param>
+        /// <returns>
+        /// The <see cref="int"/> representing the pixel size.
+        /// </returns>
+        public int ParseSize(string input)
+        {
+            int size = 0;
+
+            foreach (Match match in PixelRegex.Matches(input))
+            {
+                size = int.Parse(match.Value.Split('=')[1], CultureInfo.InvariantCulture);
+            }
+
+            return size;
+        }
+
+        /// <summary>
+        /// Returns the correct <see cref="Nullable{Rectange}"/> for the given string.
+        /// </summary>
+        /// <param name="input">
+        /// The input string containing the value to parse.
+        /// </param>
+        /// <returns>
+        /// The correct <see cref="Nullable{Rectange}"/>
+        /// </returns>
+        private Rectangle? ParseRectangle(string input)
+        {
+            int[] dimensions = { };
+
+            foreach (Match match in RectangleRegex.Matches(input))
+            {
+                dimensions = match.Value.ToPositiveIntegerArray();
+            }
+
+            if (dimensions.Length == 4)
+            {
+                return new Rectangle(dimensions[0], dimensions[1], dimensions[2], dimensions[3]);
+            }
+
+            return null;
+        }
+    }
+}