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Multi-touch development with WPF - A multi-touch RSS reader

, 1 Nov 2009 GPL3
A multi-touch RSS reader built with Multi-Touch Vista.
MultiTouchRSS_Demo.zip
MultiTouchVista
AddIns
MultipleMice
MultipleMice.dll
TuioProvider
TUIO.dll
TuioProvider.dll
Framework
AdvanceMath.dll
DynamicUtilities.dll
Multitouch.Framework.dll
Multitouch.Framework.WPF.dll
Physics2DDotNet.dll
HIDLibrary.dll
ManagedWinapi.dll
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.UnityExtensions.dll
Microsoft.Practices.ObjectBuilder2.dll
Microsoft.Practices.ServiceLocation.dll
Microsoft.Practices.Unity.dll
Multitouch.Configuration.dll
Multitouch.Configuration.Resources.dll
Multitouch.Configuration.Resources.ilk
Multitouch.Configuration.WPF.exe
Multitouch.Contracts.dll
Multitouch.Driver.Console.exe
Multitouch.Driver.Logic.dll
Multitouch.Driver.Service.exe
Multitouch.Framework.dll
Multitouch.Service.Console.exe
Multitouch.Service.exe
Multitouch.Service.Logic.dll
System.ComponentModel.Composition.dll
TouchReader
AdvanceMath.dll
DynamicUtilities.dll
Interop.Microsoft.Feeds.Interop.dll
Multitouch.Framework.dll
Multitouch.Framework.WPF.dll
MvvmFoundation.Wpf.dll
Physics2DDotNet.dll
Ricciolo.PaperBoy.Feeds.dll
TouchReader.exe
MultiTouchRSS_Source.zip
Behavior
Factory
ViewFactory.cd
HTMLConverter
MultiTouchVista
AddIns
MultipleMice
MultipleMice.dll
TuioProvider
TUIO.dll
TuioProvider.dll
Framework
AdvanceMath.dll
DynamicUtilities.dll
Multitouch.Framework.dll
Multitouch.Framework.WPF.dll
Physics2DDotNet.dll
HIDLibrary.dll
ManagedWinapi.dll
Microsoft.Practices.Composite.dll
Microsoft.Practices.Composite.Presentation.dll
Microsoft.Practices.Composite.UnityExtensions.dll
Microsoft.Practices.ObjectBuilder2.dll
Microsoft.Practices.ServiceLocation.dll
Microsoft.Practices.Unity.dll
Multitouch.Configuration.dll
Multitouch.Configuration.Resources.dll
Multitouch.Configuration.Resources.ilk
Multitouch.Configuration.WPF.exe
Multitouch.Contracts.dll
Multitouch.Driver.Console.exe
Multitouch.Driver.Logic.dll
Multitouch.Driver.Service.exe
Multitouch.Framework.dll
Multitouch.Service.Console.exe
Multitouch.Service.exe
Multitouch.Service.Logic.dll
System.ComponentModel.Composition.dll
MvvmFoundation
MvvmFoundation.Wpf.dll
PaperBoy
Interop.Microsoft.Feeds.Interop.dll
Ricciolo.PaperBoy.Feeds.dll
Properties
Settings.settings
Resources
Images
feed.png
folder.png
trash.png
View
ViewModel
ViewModel.cd
//---------------------------------------------------------------------------
// 
// File: HtmlXamlConverter.cs
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// Description: Prototype for Html - Xaml conversion 
//
//---------------------------------------------------------------------------

namespace Ricciolo.PaperBoy.UI.HTMLConverter
{
    using System;
    using System.Xml;
    using System.Diagnostics;
    using System.Collections;
    using System.Collections.Generic;
    using System.Text;
    using System.IO;

    using System.Windows; // DependencyProperty
    using System.Windows.Documents; // TextElement
  
    internal static class HtmlCssParser
    {
        // .................................................................
        //
        // Processing CSS Attributes
        //
        // .................................................................

        internal static void GetElementPropertiesFromCssAttributes(XmlElement htmlElement, string elementName, CssStylesheet stylesheet, Hashtable localProperties, List<XmlElement> sourceContext)
        {
            string styleFromStylesheet = stylesheet.GetStyle(elementName, sourceContext);

            string styleInline = HtmlToXamlConverter.GetAttribute(htmlElement, "style");

            // Combine styles from stylesheet and from inline attribute.
            // The order is important - the latter styles will override the former.
            string style = styleFromStylesheet != null ? styleFromStylesheet : null;
            if (styleInline != null)
            {
                style = style == null ? styleInline : (style + ";" + styleInline);
            }

            // Apply local style to current formatting properties
            if (style != null)
            {
                string[] styleValues = style.Split(';');
                for (int i = 0; i < styleValues.Length; i++)
                {
                    string[] styleNameValue;

                    styleNameValue = styleValues[i].Split(':');
                    if (styleNameValue.Length == 2)
                    {
                        string styleName = styleNameValue[0].Trim().ToLower();
                        string styleValue = HtmlToXamlConverter.UnQuote(styleNameValue[1].Trim()).ToLower();
                        int nextIndex = 0;

                        switch (styleName)
                        {
                            case "font":
                                ParseCssFont(styleValue, localProperties);
                                break;
                            case "font-family":
                                ParseCssFontFamily(styleValue, ref nextIndex, localProperties);
                                break;
                            case "font-size":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, "font-size", /*mustBeNonNegative:*/true);
                                break;
                            case "font-style":
                                ParseCssFontStyle(styleValue, ref nextIndex, localProperties);
                                break;
                            case "font-weight":
                                ParseCssFontWeight(styleValue, ref nextIndex, localProperties);
                                break;
                            case "font-variant":
                                ParseCssFontVariant(styleValue, ref nextIndex, localProperties);
                                break;
                            case "line-height":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, "line-height", /*mustBeNonNegative:*/true);
                                break;
                            case "word-spacing":
                                //  Implement word-spacing conversion
                                break;
                            case "letter-spacing":
                                //  Implement letter-spacing conversion
                                break;
                            case "color":
                                ParseCssColor(styleValue, ref nextIndex, localProperties, "color");
                                break;

                            case "text-decoration":
                                ParseCssTextDecoration(styleValue, ref nextIndex, localProperties);
                                break;

                            case "text-transform":
                                ParseCssTextTransform(styleValue, ref nextIndex, localProperties);
                                break;

                            case "background-color":
                                ParseCssColor(styleValue, ref nextIndex, localProperties, "background-color");
                                break;
                            case "background":
                                // TODO: need to parse composite background property
                                ParseCssBackground(styleValue, ref nextIndex, localProperties);
                                break;

                            case "text-align":
                                ParseCssTextAlign(styleValue, ref nextIndex, localProperties);
                                break;
                            case "vertical-align":
                                ParseCssVerticalAlign(styleValue, ref nextIndex, localProperties);
                                break;
                            case "text-indent":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, "text-indent", /*mustBeNonNegative:*/false);
                                break;

                            case "width":
                            case "height":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, styleName, /*mustBeNonNegative:*/true);
                                break;

                            case "margin": // top/right/bottom/left
                                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, styleName);
                                break;
                            case "margin-top":
                            case "margin-right":
                            case "margin-bottom":
                            case "margin-left":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, styleName, /*mustBeNonNegative:*/true);
                                break;

                            case "padding":
                                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, styleName);
                                break;
                            case "padding-top":
                            case "padding-right":
                            case "padding-bottom":
                            case "padding-left":
                                ParseCssSize(styleValue, ref nextIndex, localProperties, styleName, /*mustBeNonNegative:*/true);
                                break;

                            case "border":
                                ParseCssBorder(styleValue, ref nextIndex, localProperties);
                                break;
                            case "border-style":
                            case "border-width":
                            case "border-color":
                                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, styleName);
                                break;
                            case "border-top":
                            case "border-right":
                            case "border-left":
                            case "border-bottom":
                                //  Parse css border style
                                break;

                            // NOTE: css names for elementary border styles have side indications in the middle (top/bottom/left/right)
                            // In our internal notation we intentionally put them at the end - to unify processing in ParseCssRectangleProperty method
                            case "border-top-style":
                            case "border-right-style":
                            case "border-left-style":
                            case "border-bottom-style":
                            case "border-top-color":
                            case "border-right-color":
                            case "border-left-color":
                            case "border-bottom-color":
                            case "border-top-width":
                            case "border-right-width":
                            case "border-left-width":
                            case "border-bottom-width":
                                //  Parse css border style
                                break;

                            case "display":
                                //  Implement display style conversion
                                break;

                            case "float":
                                ParseCssFloat(styleValue, ref nextIndex, localProperties);
                                break;
                            case "clear":
                                ParseCssClear(styleValue, ref nextIndex, localProperties);
                                break;

                            default:
                                break;
                        }
                    }
                }
            }
        }

        // .................................................................
        //
        // Parsing CSS - Lexical Helpers
        //
        // .................................................................

        // Skips whitespaces in style values
        private static void ParseWhiteSpace(string styleValue, ref int nextIndex)
        {
            while (nextIndex < styleValue.Length && Char.IsWhiteSpace(styleValue[nextIndex]))
            {
                nextIndex++;
            }
        }

        // Checks if the following character matches to a given word and advances nextIndex
        // by the word's length in case of success.
        // Otherwise leaves nextIndex in place (except for possible whitespaces).
        // Returns true or false depending on success or failure of matching.
        private static bool ParseWord(string word, string styleValue, ref int nextIndex)
        {
            ParseWhiteSpace(styleValue, ref nextIndex);

            for (int i = 0; i < word.Length; i++)
            {
                if (!(nextIndex + i < styleValue.Length && word[i] == styleValue[nextIndex + i]))
                {
                    return false;
                }
            }

            if (nextIndex + word.Length < styleValue.Length && Char.IsLetterOrDigit(styleValue[nextIndex + word.Length]))
            {
                return false;
            }

            nextIndex += word.Length;
            return true;
        }

        // CHecks whether the following character sequence matches to one of the given words,
        // and advances the nextIndex to matched word length.
        // Returns null in case if there is no match or the word matched.
        private static string ParseWordEnumeration(string[] words, string styleValue, ref int nextIndex)
        {
            for (int i = 0; i < words.Length; i++)
            {
                if (ParseWord(words[i], styleValue, ref nextIndex))
                {
                    return words[i];
                }
            }

            return null;
        }

        private static void ParseWordEnumeration(string[] words, string styleValue, ref int nextIndex, Hashtable localProperties, string attributeName)
        {
            string attributeValue = ParseWordEnumeration(words, styleValue, ref nextIndex);
            if (attributeValue != null)
            {
                localProperties[attributeName] = attributeValue;
            }
        }

        private static string ParseCssSize(string styleValue, ref int nextIndex, bool mustBeNonNegative)
        {
            ParseWhiteSpace(styleValue, ref nextIndex);

            int startIndex = nextIndex;

            // Parse optional munis sign
            if (nextIndex < styleValue.Length && styleValue[nextIndex] == '-')
            {
                nextIndex++;
            }

            if (nextIndex < styleValue.Length && Char.IsDigit(styleValue[nextIndex]))
            {
                while (nextIndex < styleValue.Length && (Char.IsDigit(styleValue[nextIndex]) || styleValue[nextIndex] == '.'))
                {
                    nextIndex++;
                }

                string number = styleValue.Substring(startIndex, nextIndex - startIndex);

                string unit = ParseWordEnumeration(_fontSizeUnits, styleValue, ref nextIndex);
                if (unit == null)
                {
                    unit = "px"; // Assuming pixels by default
                }

                if (mustBeNonNegative && styleValue[startIndex] == '-')
                {
                    return "0";
                }
                else
                {
                    return number + unit;
                }
            }

            return null;
        }

        private static void ParseCssSize(string styleValue, ref int nextIndex, Hashtable localValues, string propertyName, bool mustBeNonNegative)
        {
            string length = ParseCssSize(styleValue, ref nextIndex, mustBeNonNegative);
            if (length != null)
            {
                localValues[propertyName] = length;
            }
        }

        private static readonly string[] _colors = new string[]
            {
                "aliceblue", "antiquewhite", "aqua", "aquamarine", "azure", "beige", "bisque", "black", "blanchedalmond",
                "blue", "blueviolet", "brown", "burlywood", "cadetblue", "chartreuse", "chocolate", "coral",
                "cornflowerblue", "cornsilk", "crimson", "cyan", "darkblue", "darkcyan", "darkgoldenrod", "darkgray",
                "darkgreen", "darkkhaki", "darkmagenta", "darkolivegreen", "darkorange", "darkorchid", "darkred",
                "darksalmon", "darkseagreen", "darkslateblue", "darkslategray", "darkturquoise", "darkviolet", "deeppink",
                "deepskyblue", "dimgray", "dodgerblue", "firebrick", "floralwhite", "forestgreen", "fuchsia", "gainsboro",
                "ghostwhite", "gold", "goldenrod", "gray", "green", "greenyellow", "honeydew", "hotpink", "indianred",
                "indigo", "ivory", "khaki", "lavender", "lavenderblush", "lawngreen", "lemonchiffon", "lightblue", "lightcoral",
                "lightcyan", "lightgoldenrodyellow", "lightgreen", "lightgrey", "lightpink", "lightsalmon", "lightseagreen",
                "lightskyblue", "lightslategray", "lightsteelblue", "lightyellow", "lime", "limegreen", "linen", "magenta", 
                "maroon", "mediumaquamarine", "mediumblue", "mediumorchid", "mediumpurple", "mediumseagreen", "mediumslateblue",
                "mediumspringgreen", "mediumturquoise", "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin",
                "navajowhite", "navy", "oldlace", "olive", "olivedrab", "orange", "orangered", "orchid", "palegoldenrod",
                "palegreen", "paleturquoise", "palevioletred", "papayawhip", "peachpuff", "peru", "pink", "plum", "powderblue",
                "purple", "red", "rosybrown", "royalblue", "saddlebrown", "salmon", "sandybrown", "seagreen", "seashell",
                "sienna", "silver", "skyblue", "slateblue", "slategray", "snow", "springgreen", "steelblue", "tan", "teal",
                "thistle", "tomato", "turquoise", "violet", "wheat", "white", "whitesmoke", "yellow", "yellowgreen",
            };

        private static readonly string[] _systemColors = new string[]
            {
                "activeborder", "activecaption", "appworkspace", "background", "buttonface", "buttonhighlight", "buttonshadow",
                "buttontext", "captiontext", "graytext", "highlight", "highlighttext", "inactiveborder", "inactivecaption",
                "inactivecaptiontext", "infobackground", "infotext", "menu", "menutext", "scrollbar", "threeddarkshadow",
                "threedface", "threedhighlight", "threedlightshadow", "threedshadow", "window", "windowframe", "windowtext",
            };

        private static string ParseCssColor(string styleValue, ref int nextIndex)
        {
            //  Implement color parsing
            // rgb(100%,53.5%,10%)
            // rgb(255,91,26)
            // #FF5B1A
            // black | silver | gray | ... | aqua
            // transparent - for background-color
            ParseWhiteSpace(styleValue, ref nextIndex);

            string color = null;

            if (nextIndex < styleValue.Length)
            {
                int startIndex = nextIndex;
                char character = styleValue[nextIndex];

                if (character == '#')
                {
                    nextIndex++;
                    while (nextIndex < styleValue.Length)
                    {
                        character = Char.ToUpper(styleValue[nextIndex]);
                        if (!('0' <= character && character <= '9' || 'A' <= character && character <= 'F'))
                        {
                            break;
                        }
                        nextIndex++;
                    }
                    if (nextIndex > startIndex + 1)
                    {
                        color = styleValue.Substring(startIndex, nextIndex - startIndex);
                    }
                }
                else if (styleValue.Substring(nextIndex, 3).ToLower() == "rbg")
                {
                    //  Implement real rgb() color parsing
                    while (nextIndex < styleValue.Length && styleValue[nextIndex] != ')')
                    {
                        nextIndex++;
                    }
                    if (nextIndex < styleValue.Length)
                    {
                        nextIndex++; // to skip ')'
                    }
                    color = "gray"; // return bogus color
                }
                else if (Char.IsLetter(character))
                {
                    color = ParseWordEnumeration(_colors, styleValue, ref nextIndex);
                    if (color == null)
                    {
                        color = ParseWordEnumeration(_systemColors, styleValue, ref nextIndex);
                        if (color != null)
                        {
                            //  Implement smarter system color converions into real colors
                            color = "black";
                        }
                    }
                }
            }

            return color;
        }

        private static void ParseCssColor(string styleValue, ref int nextIndex, Hashtable localValues, string propertyName)
        {
            string color = ParseCssColor(styleValue, ref nextIndex);
            if (color != null)
            {
                localValues[propertyName] = color;
            }
        }

        // .................................................................
        //
        // Pasring CSS font Property
        //
        // .................................................................

        // CSS has five font properties: font-family, font-style, font-variant, font-weight, font-size.
        // An aggregated "font" property lets you specify in one action all the five in combination
        // with additional line-height property.
        // 
        // font-family: [<family-name>,]* [<family-name> | <generic-family>]
        //    generic-family: serif | sans-serif | monospace | cursive | fantasy
        //       The list of families sets priorities to choose fonts;
        //       Quotes not allowed around generic-family names
        // font-style: normal | italic | oblique
        // font-variant: normal | small-caps
        // font-weight: normal | bold | bolder | lighter | 100 ... 900 |
        //    Default is "normal", normal==400
        // font-size: <absolute-size> | <relative-size> | <length> | <percentage>
        //    absolute-size: xx-small | x-small | small | medium | large | x-large | xx-large
        //    relative-size: larger | smaller
        //    length: <point> | <pica> | <ex> | <em> | <points> | <millimeters> | <centimeters> | <inches>
        //    Default: medium
        // font: [ <font-style> || <font-variant> || <font-weight ]? <font-size> [ / <line-height> ]? <font-family>

        private static readonly string[] _fontGenericFamilies = new string[] { "serif", "sans-serif", "monospace", "cursive", "fantasy" };
        private static readonly string[] _fontStyles = new string[] { "normal", "italic", "oblique" };
        private static readonly string[] _fontVariants = new string[] { "normal", "small-caps" };
        private static readonly string[] _fontWeights = new string[] { "normal", "bold", "bolder", "lighter", "100", "200", "300", "400", "500", "600", "700", "800", "900" };
        private static readonly string[] _fontAbsoluteSizes = new string[] { "xx-small", "x-small", "small", "medium", "large", "x-large", "xx-large" };
        private static readonly string[] _fontRelativeSizes = new string[] { "larger", "smaller" };
        private static readonly string[] _fontSizeUnits = new string[] { "px", "mm", "cm", "in", "pt", "pc", "em", "ex", "%" };

        // Parses CSS string fontStyle representing a value for css font attribute
        private static void ParseCssFont(string styleValue, Hashtable localProperties)
        {
            int nextIndex = 0;

            ParseCssFontStyle(styleValue, ref nextIndex, localProperties);
            ParseCssFontVariant(styleValue, ref nextIndex, localProperties);
            ParseCssFontWeight(styleValue, ref nextIndex, localProperties);

            ParseCssSize(styleValue, ref nextIndex, localProperties, "font-size", /*mustBeNonNegative:*/true);

            ParseWhiteSpace(styleValue, ref nextIndex);
            if (nextIndex < styleValue.Length && styleValue[nextIndex] == '/')
            {
                nextIndex++;
                ParseCssSize(styleValue, ref nextIndex, localProperties, "line-height", /*mustBeNonNegative:*/true);
            }

            ParseCssFontFamily(styleValue, ref nextIndex, localProperties);
        }

        private static void ParseCssFontStyle(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_fontStyles, styleValue, ref nextIndex, localProperties, "font-style");
        }

        private static void ParseCssFontVariant(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_fontVariants, styleValue, ref nextIndex, localProperties, "font-variant");
        }

        private static void ParseCssFontWeight(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_fontWeights, styleValue, ref nextIndex, localProperties, "font-weight");
        }

        private static void ParseCssFontFamily(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            string fontFamilyList = null;

            while (nextIndex < styleValue.Length)
            {
                // Try generic-family
                string fontFamily = ParseWordEnumeration(_fontGenericFamilies, styleValue, ref nextIndex);

                if (fontFamily == null)
                {
                    // Try quoted font family name
                    if (nextIndex < styleValue.Length && (styleValue[nextIndex] == '"' || styleValue[nextIndex] == '\''))
                    {
                        char quote = styleValue[nextIndex];

                        nextIndex++;

                        int startIndex = nextIndex;

                        while (nextIndex < styleValue.Length && styleValue[nextIndex] != quote)
                        {
                            nextIndex++;
                        }

                        fontFamily = '"' + styleValue.Substring(startIndex, nextIndex - startIndex) + '"';
                    }

                    if (fontFamily == null)
                    {
                        // Try unquoted font family name
                        int startIndex = nextIndex;
                        while (nextIndex < styleValue.Length && styleValue[nextIndex] != ',' && styleValue[nextIndex] != ';')
                        {
                            nextIndex++;
                        }

                        if (nextIndex > startIndex)
                        {
                            fontFamily = styleValue.Substring(startIndex, nextIndex - startIndex).Trim();
                            if (fontFamily.Length == 0)
                            {
                                fontFamily = null;
                            }
                        }
                    }
                }

                ParseWhiteSpace(styleValue, ref nextIndex);
                if (nextIndex < styleValue.Length && styleValue[nextIndex] == ',')
                {
                    nextIndex++;
                }

                if (fontFamily != null)
                {
                    //  css font-family can contein a list of names. We only consider the first name from the list. Need a decision what to do with remaining names
                    // fontFamilyList = (fontFamilyList == null) ? fontFamily : fontFamilyList + "," + fontFamily;
                    if (fontFamilyList == null && fontFamily.Length > 0)
                    {
                        if (fontFamily[0] == '"' || fontFamily[0] == '\'')
                        {
                            // Unquote the font family name
                            fontFamily = fontFamily.Substring(1, fontFamily.Length - 2);
                        }
                        else
                        {
                            // Convert generic css family name
                        }
                        fontFamilyList = fontFamily;
                    }
                }
                else
                {
                    break;
                }
            }

            if (fontFamilyList != null)
            {
                localProperties["font-family"] = fontFamilyList;
            }
        }

        // .................................................................
        //
        // Pasring CSS list-style Property
        //
        // .................................................................

        // list-style: [ <list-style-type> || <list-style-position> || <list-style-image> ]

        private static readonly string[] _listStyleTypes = new string[] { "disc", "circle", "square", "decimal", "lower-roman", "upper-roman", "lower-alpha", "upper-alpha", "none" };
        private static readonly string[] _listStylePositions = new string[] { "inside", "outside" };

        private static void ParseCssListStyle(string styleValue, Hashtable localProperties)
        {
            int nextIndex = 0;

            while (nextIndex < styleValue.Length)
            {
                string listStyleType = ParseCssListStyleType(styleValue, ref nextIndex);
                if (listStyleType != null)
                {
                    localProperties["list-style-type"] = listStyleType;
                }
                else
                {
                    string listStylePosition = ParseCssListStylePosition(styleValue, ref nextIndex);
                    if (listStylePosition != null)
                    {
                        localProperties["list-style-position"] = listStylePosition;
                    }
                    else
                    {
                        string listStyleImage = ParseCssListStyleImage(styleValue, ref nextIndex);
                        if (listStyleImage != null)
                        {
                            localProperties["list-style-image"] = listStyleImage;
                        }
                        else
                        {
                            // TODO: Process unrecognized list style value
                            break;
                        }
                    }
                }
            }
        }

        private static string ParseCssListStyleType(string styleValue, ref int nextIndex)
        {
            return ParseWordEnumeration(_listStyleTypes, styleValue, ref nextIndex);
        }

        private static string ParseCssListStylePosition(string styleValue, ref int nextIndex)
        {
            return ParseWordEnumeration(_listStylePositions, styleValue, ref nextIndex);
        }

        private static string ParseCssListStyleImage(string styleValue, ref int nextIndex)
        {
            // TODO: Implement URL parsing for images
            return null;
        }

        // .................................................................
        //
        // Pasring CSS text-decorations Property
        //
        // .................................................................

        private static readonly string[] _textDecorations = new string[] { "none", "underline", "overline", "line-through", "blink" };

        private static void ParseCssTextDecoration(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            // Set default text-decorations:none;
            for (int i = 1; i < _textDecorations.Length; i++)
            {
                localProperties["text-decoration-" + _textDecorations[i]] = "false";
            }

            // Parse list of decorations values
            while (nextIndex < styleValue.Length)
            {
                string decoration = ParseWordEnumeration(_textDecorations, styleValue, ref nextIndex);
                if (decoration == null || decoration == "none")
                {
                    break;
                }
                localProperties["text-decoration-" + decoration] = "true";
            }
        }

        // .................................................................
        //
        // Pasring CSS text-transform Property
        //
        // .................................................................

        private static readonly string[] _textTransforms = new string[] { "none", "capitalize", "uppercase", "lowercase" };

        private static void ParseCssTextTransform(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_textTransforms, styleValue, ref nextIndex, localProperties, "text-transform");
        }

        // .................................................................
        //
        // Pasring CSS text-align Property
        //
        // .................................................................

        private static readonly string[] _textAligns = new string[] { "left", "right", "center", "justify" };

        private static void ParseCssTextAlign(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_textAligns, styleValue, ref nextIndex, localProperties, "text-align");
        }

        // .................................................................
        //
        // Pasring CSS vertical-align Property
        //
        // .................................................................

        private static readonly string[] _verticalAligns = new string[] { "baseline", "sub", "super", "top", "text-top", "middle", "bottom", "text-bottom" };

        private static void ParseCssVerticalAlign(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            //  Parse percentage value for vertical-align style
            ParseWordEnumeration(_verticalAligns, styleValue, ref nextIndex, localProperties, "vertical-align");
        }

        // .................................................................
        //
        // Pasring CSS float Property
        //
        // .................................................................

        private static readonly string[] _floats = new string[] { "left", "right", "none" };

        private static void ParseCssFloat(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_floats, styleValue, ref nextIndex, localProperties, "float");
        }

        // .................................................................
        //
        // Pasring CSS clear Property
        //
        // .................................................................

        private static readonly string[] _clears = new string[] { "none", "left", "right", "both" };

        private static void ParseCssClear(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            ParseWordEnumeration(_clears, styleValue, ref nextIndex, localProperties, "clear");
        }

        // .................................................................
        //
        // Pasring CSS margin and padding Properties
        //
        // .................................................................

        // Generic method for parsing any of four-values properties, such as margin, padding, border-width, border-style, border-color
        private static bool ParseCssRectangleProperty(string styleValue, ref int nextIndex, Hashtable localProperties, string propertyName)
        {
            // CSS Spec: 
            // If only one value is set, then the value applies to all four sides;
            // If two or three values are set, then missinng value(s) are taken fromm the opposite side(s).
            // The order they are applied is: top/right/bottom/left

            Debug.Assert(propertyName == "margin" || propertyName == "padding" || propertyName == "border-width" || propertyName == "border-style" || propertyName == "border-color");

            string value = propertyName == "border-color" ? ParseCssColor(styleValue, ref nextIndex) : propertyName == "border-style" ? ParseCssBorderStyle(styleValue, ref nextIndex) : ParseCssSize(styleValue, ref nextIndex, /*mustBeNonNegative:*/true);
            if (value != null)
            {
                localProperties[propertyName + "-top"] = value;
                localProperties[propertyName + "-bottom"] = value;
                localProperties[propertyName + "-right"] = value;
                localProperties[propertyName + "-left"] = value;
                value = propertyName == "border-color" ? ParseCssColor(styleValue, ref nextIndex) : propertyName == "border-style" ? ParseCssBorderStyle(styleValue, ref nextIndex) : ParseCssSize(styleValue, ref nextIndex, /*mustBeNonNegative:*/true);
                if (value != null)
                {
                    localProperties[propertyName + "-right"] = value;
                    localProperties[propertyName + "-left"] = value;
                    value = propertyName == "border-color" ? ParseCssColor(styleValue, ref nextIndex) : propertyName == "border-style" ? ParseCssBorderStyle(styleValue, ref nextIndex) : ParseCssSize(styleValue, ref nextIndex, /*mustBeNonNegative:*/true);
                    if (value != null)
                    {
                        localProperties[propertyName + "-bottom"] = value;
                        value = propertyName == "border-color" ? ParseCssColor(styleValue, ref nextIndex) : propertyName == "border-style" ? ParseCssBorderStyle(styleValue, ref nextIndex) : ParseCssSize(styleValue, ref nextIndex, /*mustBeNonNegative:*/true);
                        if (value != null)
                        {
                            localProperties[propertyName + "-left"] = value;
                        }
                    }
                }

                return true;
            }

            return false;
        }

        // .................................................................
        //
        // Pasring CSS border Properties
        //
        // .................................................................

        // border: [ <border-width> || <border-style> || <border-color> ]

        private static void ParseCssBorder(string styleValue, ref int nextIndex, Hashtable localProperties)
        {
            while (
                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, "border-width") ||
                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, "border-style") ||
                ParseCssRectangleProperty(styleValue, ref nextIndex, localProperties, "border-color"))
            {
            }
        }

        // .................................................................
        //
        // Pasring CSS border-style Propertie
        //
        // .................................................................

        private static readonly string[] _borderStyles = new string[] { "none", "dotted", "dashed", "solid", "double", "groove", "ridge", "inset", "outset" };

        private static string ParseCssBorderStyle(string styleValue, ref int nextIndex)
        {
            return ParseWordEnumeration(_borderStyles, styleValue, ref nextIndex);
        }


        // .................................................................
        //
        //  What are these definitions doing here:
        //
        // .................................................................

        private static string[] _blocks = new string[] { "block", "inline", "list-item", "none" };

        // .................................................................
        //
        // Pasring CSS Background Properties
        //
        // .................................................................

        private static void ParseCssBackground(string styleValue, ref int nextIndex, Hashtable localValues)
        {
            //  Implement parsing background attribute
        }
    }


    internal class CssStylesheet
    {
        // Constructor
        public CssStylesheet(XmlElement htmlElement)
        {
            if (htmlElement != null)
            {
                this.DiscoverStyleDefinitions(htmlElement);
            }
        }

        // Recursively traverses an html tree, discovers STYLE elements and creates a style definition table
        // for further cascading style application
        public void DiscoverStyleDefinitions(XmlElement htmlElement)
        {
            if (htmlElement.LocalName.ToLower() == "link")
            {
                return;
                //  Add LINK elements processing for included stylesheets
                // <LINK href="http://sc.msn.com/global/css/ptnr/orange.css" type=text/css \r\nrel=stylesheet>
            }

            if (htmlElement.LocalName.ToLower() != "style")
            {
                // This is not a STYLE element. Recurse into it
                for (XmlNode htmlChildNode = htmlElement.FirstChild; htmlChildNode != null; htmlChildNode = htmlChildNode.NextSibling)
                {
                    if (htmlChildNode is XmlElement)
                    {
                        this.DiscoverStyleDefinitions((XmlElement)htmlChildNode);
                    }
                }
                return;
            }

            // Add style definitions from this style.

            // Collect all text from this style definition
            StringBuilder stylesheetBuffer = new StringBuilder();

            for (XmlNode htmlChildNode = htmlElement.FirstChild; htmlChildNode != null; htmlChildNode = htmlChildNode.NextSibling)
            {
                if (htmlChildNode is XmlText || htmlChildNode is XmlComment)
                {
                    stylesheetBuffer.Append(RemoveComments(htmlChildNode.Value));
                }
            }

            // CssStylesheet has the following syntactical structure:
            //     @import declaration;
            //     selector { definition }
            // where "selector" is one of: ".classname", "tagname"
            // It can contain comments in the following form: /*...*/

            int nextCharacterIndex = 0;
            while (nextCharacterIndex < stylesheetBuffer.Length)
            {
                // Extract selector
                int selectorStart = nextCharacterIndex;
                while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != '{')
                {
                    // Skip declaration directive starting from @
                    if (stylesheetBuffer[nextCharacterIndex] == '@')
                    {
                        while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != ';')
                        {
                            nextCharacterIndex++;
                        }
                        selectorStart = nextCharacterIndex + 1;
                    }
                    nextCharacterIndex++;
                }

                if (nextCharacterIndex < stylesheetBuffer.Length)
                {
                    // Extract definition
                    int definitionStart = nextCharacterIndex;
                    while (nextCharacterIndex < stylesheetBuffer.Length && stylesheetBuffer[nextCharacterIndex] != '}')
                    {
                        nextCharacterIndex++;
                    }

                    // Define a style
                    if (nextCharacterIndex - definitionStart > 2)
                    {
                        this.AddStyleDefinition(
                            stylesheetBuffer.ToString(selectorStart, definitionStart - selectorStart),
                            stylesheetBuffer.ToString(definitionStart + 1, nextCharacterIndex - definitionStart - 2));
                    }

                    // Skip closing brace
                    if (nextCharacterIndex < stylesheetBuffer.Length)
                    {
                        Debug.Assert(stylesheetBuffer[nextCharacterIndex] == '}');
                        nextCharacterIndex++;
                    }
                }
            }
        }

        // Returns a string with all c-style comments replaced by spaces
        private string RemoveComments(string text)
        {
            int commentStart = text.IndexOf("/*");
            if (commentStart < 0)
            {
                return text;
            }

            int commentEnd = text.IndexOf("*/", commentStart + 2);
            if (commentEnd < 0)
            {
                return text.Substring(0, commentStart);
            }

            return text.Substring(0, commentStart) + " " + RemoveComments(text.Substring(commentEnd + 2));
        }


        public void AddStyleDefinition(string selector, string definition)
        {
            // Notrmalize parameter values
            selector = selector.Trim().ToLower();
            definition = definition.Trim().ToLower();
            if (selector.Length == 0 || definition.Length == 0)
            {
                return;
            }

            if (_styleDefinitions == null)
            {
                _styleDefinitions = new List<StyleDefinition>();
            }

            string[] simpleSelectors = selector.Split(',');

            for (int i = 0; i < simpleSelectors.Length; i++)
            {
                string simpleSelector = simpleSelectors[i].Trim();
                if (simpleSelector.Length > 0)
                {
                    _styleDefinitions.Add(new StyleDefinition(simpleSelector, definition));
                }
            }
        }

        public string GetStyle(string elementName, List<XmlElement> sourceContext)
        {
            Debug.Assert(sourceContext.Count > 0);
            Debug.Assert(elementName == sourceContext[sourceContext.Count - 1].LocalName);

            //  Add id processing for style selectors
            if (_styleDefinitions != null)
            {
                for (int i = _styleDefinitions.Count - 1; i >= 0;  i--)
                {
                    string selector = _styleDefinitions[i].Selector;

                    string[] selectorLevels = selector.Split(' ');

                    int indexInSelector = selectorLevels.Length - 1;
                    int indexInContext = sourceContext.Count - 1;
                    string selectorLevel = selectorLevels[indexInSelector].Trim();

                    if (MatchSelectorLevel(selectorLevel, sourceContext[sourceContext.Count - 1]))
                    {
                        return _styleDefinitions[i].Definition;
                    }
                }
            }

            return null;
        }

        private bool MatchSelectorLevel(string selectorLevel, XmlElement xmlElement)
        {
            if (selectorLevel.Length == 0)
            {
                return false;
            }

            int indexOfDot = selectorLevel.IndexOf('.');
            int indexOfPound = selectorLevel.IndexOf('#');

            string selectorClass = null;
            string selectorId = null;
            string selectorTag = null;
            if (indexOfDot >= 0)
            {
                if (indexOfDot > 0)
                {
                    selectorTag = selectorLevel.Substring(0, indexOfDot);
                }
                selectorClass = selectorLevel.Substring(indexOfDot + 1);
            }
            else if (indexOfPound >= 0)
            {
                if (indexOfPound > 0)
                {
                    selectorTag = selectorLevel.Substring(0, indexOfPound);
                }
                selectorId = selectorLevel.Substring(indexOfPound + 1);
            }
            else
            {
                selectorTag = selectorLevel;
            }

            if (selectorTag != null && selectorTag != xmlElement.LocalName)
            {
                return false;
            }

            if (selectorId != null && HtmlToXamlConverter.GetAttribute(xmlElement, "id") != selectorId)
            {
                return false;
            }

            if (selectorClass != null && HtmlToXamlConverter.GetAttribute(xmlElement, "class") != selectorClass)
            {
                return false;
            }

            return true;
        }

        private class StyleDefinition
        {
            public StyleDefinition(string selector, string definition)
            {
                this.Selector = selector;
                this.Definition = definition;
            }

            public string Selector;

            public string Definition;
        }

        private List<StyleDefinition> _styleDefinitions;
    }
}

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About the Author

Roberto Sonnino
Virtual Dreams
Brazil Brazil
Hi! I'm Roberto. I'm a Brazilian Engineering student at the University of São Paulo and the Ecole Centrale de Lille (France).

I've participated in the Imagine Cup competition and went to the world finals every year from 2005 to 2009. I also won the 1st place award in 2006, in India, for the Interface Design invitational, in 2007 in Korea, for the Embedded Development invitational, and in 2009 in Egypt for the Windows Mobile Award.

Currently I keep a blog (in English and Portuguese) at http://virtualdreams.com.br/blog/ and a weekly webcast about WPF and Silverlight (in Portuguese) at http://www.xamlcast.net.
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