CssTextWriter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / CssTextWriter.cs / 1 / CssTextWriter.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI { 
    using System; 
    using System.Collections;
    using System.Globalization; 
    using System.IO;
    using System.Text;
    using System.Web.Util;
 

    ///  
    /// Derived TextWriter that provides CSS rendering API. 
    /// 
    internal sealed class CssTextWriter : TextWriter { 
        private TextWriter _writer;

        private static Hashtable attrKeyLookupTable;
        private static AttributeInformation[] attrNameLookupArray; 

        static CssTextWriter() { 
            // register known style attributes, HtmlTextWriterStyle.Length 
            attrKeyLookupTable = new Hashtable((int)HtmlTextWriterStyle.ZIndex + 1);
            attrNameLookupArray = new AttributeInformation[(int)HtmlTextWriterStyle.ZIndex + 1]; 

            RegisterAttribute("background-color", HtmlTextWriterStyle.BackgroundColor);
            RegisterAttribute("background-image", HtmlTextWriterStyle.BackgroundImage, true, true);
            RegisterAttribute("border-collapse", HtmlTextWriterStyle.BorderCollapse); 
            RegisterAttribute("border-color", HtmlTextWriterStyle.BorderColor);
            RegisterAttribute("border-style", HtmlTextWriterStyle.BorderStyle); 
            RegisterAttribute("border-width", HtmlTextWriterStyle.BorderWidth); 
            RegisterAttribute("color", HtmlTextWriterStyle.Color);
            RegisterAttribute("cursor", HtmlTextWriterStyle.Cursor); 
            RegisterAttribute("direction", HtmlTextWriterStyle.Direction);
            RegisterAttribute("display", HtmlTextWriterStyle.Display);
            RegisterAttribute("filter", HtmlTextWriterStyle.Filter);
            RegisterAttribute("font-family", HtmlTextWriterStyle.FontFamily, true); 
            RegisterAttribute("font-size", HtmlTextWriterStyle.FontSize);
            RegisterAttribute("font-style", HtmlTextWriterStyle.FontStyle); 
            RegisterAttribute("font-variant", HtmlTextWriterStyle.FontVariant); 
            RegisterAttribute("font-weight", HtmlTextWriterStyle.FontWeight);
            RegisterAttribute("height", HtmlTextWriterStyle.Height); 
            RegisterAttribute("left", HtmlTextWriterStyle.Left);
            RegisterAttribute("list-style-image", HtmlTextWriterStyle.ListStyleImage, true, true);
            RegisterAttribute("list-style-type", HtmlTextWriterStyle.ListStyleType);
            RegisterAttribute("margin", HtmlTextWriterStyle.Margin); 
            RegisterAttribute("margin-bottom", HtmlTextWriterStyle.MarginBottom);
            RegisterAttribute("margin-left", HtmlTextWriterStyle.MarginLeft); 
            RegisterAttribute("margin-right", HtmlTextWriterStyle.MarginRight); 
            RegisterAttribute("margin-top", HtmlTextWriterStyle.MarginTop);
            RegisterAttribute("overflow-x", HtmlTextWriterStyle.OverflowX); 
            RegisterAttribute("overflow-y", HtmlTextWriterStyle.OverflowY);
            RegisterAttribute("overflow", HtmlTextWriterStyle.Overflow);
            RegisterAttribute("padding", HtmlTextWriterStyle.Padding);
            RegisterAttribute("padding-bottom", HtmlTextWriterStyle.PaddingBottom); 
            RegisterAttribute("padding-left", HtmlTextWriterStyle.PaddingLeft);
            RegisterAttribute("padding-right", HtmlTextWriterStyle.PaddingRight); 
            RegisterAttribute("padding-top", HtmlTextWriterStyle.PaddingTop); 
            RegisterAttribute("position", HtmlTextWriterStyle.Position);
            RegisterAttribute("text-align", HtmlTextWriterStyle.TextAlign); 
            RegisterAttribute("text-decoration", HtmlTextWriterStyle.TextDecoration);
            RegisterAttribute("text-overflow", HtmlTextWriterStyle.TextOverflow);
            RegisterAttribute("top", HtmlTextWriterStyle.Top);
            RegisterAttribute("vertical-align", HtmlTextWriterStyle.VerticalAlign); 
            RegisterAttribute("visibility", HtmlTextWriterStyle.Visibility);
            RegisterAttribute("width", HtmlTextWriterStyle.Width); 
            RegisterAttribute("white-space", HtmlTextWriterStyle.WhiteSpace); 
            RegisterAttribute("z-index", HtmlTextWriterStyle.ZIndex);
        } 


        /// 
        /// Initializes an instance of a CssTextWriter with its underlying TextWriter. 
        /// 
        public CssTextWriter(TextWriter writer) { 
            _writer = writer; 
        }
 

        /// 
        public override Encoding Encoding {
            get { 
                return _writer.Encoding;
            } 
        } 

 
        /// 
        public override string NewLine {
            get {
                return _writer.NewLine; 
            }
            set { 
                _writer.NewLine = value; 
            }
        } 


        /// 
        public override void Close() { 
            _writer.Close();
        } 
 

        ///  
        public override void Flush() {
            _writer.Flush();
        }
 

        ///  
        /// Returns the HtmlTextWriterStyle value for known style attributes. 
        /// 
        public static HtmlTextWriterStyle GetStyleKey(string styleName) { 
            if (!String.IsNullOrEmpty(styleName)) {
                object key = attrKeyLookupTable[styleName.ToLower(CultureInfo.InvariantCulture)];
                if (key != null) {
                    return (HtmlTextWriterStyle)key; 
                }
            } 
 
            return (HtmlTextWriterStyle)(-1);
        } 


        /// 
        /// Returns the name of the attribute corresponding to the specified HtmlTextWriterStyle value. 
        /// 
        public static string GetStyleName(HtmlTextWriterStyle styleKey) { 
            if ((int)styleKey >= 0 && (int)styleKey < attrNameLookupArray.Length) { 
                return attrNameLookupArray[(int)styleKey].name;
            } 

            return String.Empty;
        }
 

        ///  
        /// Does the specified style key require attribute value encoding if the value is being 
        /// rendered in a style attribute.
        ///  
        public static bool IsStyleEncoded(HtmlTextWriterStyle styleKey) {
            if ((int)styleKey >= 0 && (int)styleKey < attrNameLookupArray.Length) {
                return attrNameLookupArray[(int)styleKey].encode;
            } 

            return true; 
        } 

 
        /// 
        /// 
        /// Registers the specified style attribute to create a mapping between a string representation
        /// and the corresponding HtmlTextWriterStyle value. 
        /// 
        internal static void RegisterAttribute(string name, HtmlTextWriterStyle key) { 
            RegisterAttribute(name, key, false, false); 
        }
 

        /// 
        /// 
        /// Registers the specified style attribute to create a mapping between a string representation 
        /// and the corresponding HtmlTextWriterStyle value.
        ///  
        internal static void RegisterAttribute(string name, HtmlTextWriterStyle key, bool encode) { 
            RegisterAttribute(name, key, encode, false);
        } 


        /// 
        ///  
        /// Registers the specified style attribute to create a mapping between a string representation
        /// and the corresponding HtmlTextWriterStyle value. 
        /// In addition, the mapping can include additional information about the attribute type 
        /// such as whether it is a URL.
        ///  
        internal static void RegisterAttribute(string name, HtmlTextWriterStyle key, bool encode, bool isUrl) {
            string nameLCase = name.ToLower(CultureInfo.InvariantCulture);

            attrKeyLookupTable.Add(nameLCase, key); 
            if ((int)key < attrNameLookupArray.Length) {
                attrNameLookupArray[(int)key] = new AttributeInformation(name, encode, isUrl); 
            } 
        }
 

        /// 
        public override void Write(string s) {
            _writer.Write(s); 
        }
 
 
        /// 
        public override void Write(bool value) { 
            _writer.Write(value);
        }

 
        /// 
        public override void Write(char value) { 
            _writer.Write(value); 
        }
 

        /// 
        public override void Write(char[] buffer) {
            _writer.Write(buffer); 
        }
 
 
        /// 
        public override void Write(char[] buffer, int index, int count) { 
            _writer.Write(buffer, index, count);
        }

 
        /// 
        public override void Write(double value) { 
            _writer.Write(value); 
        }
 

        /// 
        public override void Write(float value) {
            _writer.Write(value); 
        }
 
 
        /// 
        public override void Write(int value) { 
            _writer.Write(value);
        }

 
        /// 
        public override void Write(long value) { 
            _writer.Write(value); 
        }
 

        /// 
        public override void Write(object value) {
            _writer.Write(value); 
        }
 
 
        /// 
        public override void Write(string format, object arg0) { 
            _writer.Write(format, arg0);
        }

 
        /// 
        public override void Write(string format, object arg0, object arg1) { 
            _writer.Write(format, arg0, arg1); 
        }
 

        /// 
        public override void Write(string format, params object[] arg) {
            _writer.Write(format, arg); 
        }
 
 
        /// 
        /// Render out the specified style attribute and value. 
        /// 
        public void WriteAttribute(string name, string value) {
            WriteAttribute(_writer, GetStyleKey(name), name, value);
        } 

 
        ///  
        /// Render out the specified style attribute and value.
        ///  
        public void WriteAttribute(HtmlTextWriterStyle key, string value) {
            WriteAttribute(_writer, key, GetStyleName(key), value);
        }
 
        /// 
        /// Render the specified style attribute into the specified TextWriter. 
        /// This method contains all the logic for rendering a CSS name/value pair. 
        /// 
        private static void WriteAttribute(TextWriter writer, HtmlTextWriterStyle key, string name, string value) { 
            writer.Write(name);
            writer.Write(':');

            bool isUrl = false; 
            if (key != (HtmlTextWriterStyle)(-1)) {
                isUrl = attrNameLookupArray[(int)key].isUrl; 
            } 

            if (isUrl == false) { 
                writer.Write(value);
            }
            else {
                WriteUrlAttribute(writer, value); 
            }
 
            writer.Write(';'); 
        }
 
        /// 
        /// Render the specified style attributes. This is used by HtmlTextWriter to render out all
        /// its collected style attributes.
        ///  
        internal static void WriteAttributes(TextWriter writer, RenderStyle[] styles, int count) {
            for (int i = 0; i < count; i++) { 
                RenderStyle style = styles[i]; 
                WriteAttribute(writer, style.key, style.name, style.value);
            } 
        }


        ///  
        /// Start rendering a new CSS rule with the given selector.
        ///  
        public void WriteBeginCssRule(string selector) { 
            _writer.Write(selector);
            _writer.Write(" { "); 
        }


        ///  
        /// End the current CSS rule that is being rendered.
        ///  
        public void WriteEndCssRule() { 
            _writer.WriteLine(" }");
        } 


        /// 
        public override void WriteLine(string s) { 
            _writer.WriteLine(s);
        } 
 

        ///  
        public override void WriteLine() {
            _writer.WriteLine();
        }
 

        ///  
        public override void WriteLine(bool value) { 
            _writer.WriteLine(value);
        } 


        /// 
        public override void WriteLine(char value) { 
            _writer.WriteLine(value);
        } 
 

        ///  
        public override void WriteLine(char[] buffer) {
            _writer.WriteLine(buffer);
        }
 

        ///  
        public override void WriteLine(char[] buffer, int index, int count) { 
            _writer.WriteLine(buffer, index, count);
        } 


        /// 
        public override void WriteLine(double value) { 
            _writer.WriteLine(value);
        } 
 

        ///  
        public override void WriteLine(float value) {
            _writer.WriteLine(value);
        }
 

        ///  
        public override void WriteLine(int value) { 
            _writer.WriteLine(value);
        } 


        /// 
        public override void WriteLine(long value) { 
            _writer.WriteLine(value);
        } 
 

        ///  
        public override void WriteLine(object value) {
            _writer.WriteLine(value);
        }
 

        ///  
        public override void WriteLine(string format, object arg0) { 
            _writer.WriteLine(format, arg0);
        } 


        /// 
        public override void WriteLine(string format, object arg0, object arg1) { 
            _writer.WriteLine(format, arg0, arg1);
        } 
 

        ///  
        public override void WriteLine(string format, params object[] arg) {
            _writer.WriteLine(format, arg);
        }
 

        ///  
        public override void WriteLine(UInt32 value) { 
            _writer.WriteLine(value);
        } 

        /// 
        /// Writes out the specified URL value with the appropriate encoding
        /// and url() syntax. 
        /// 
        private static void WriteUrlAttribute(TextWriter writer, string url) { 
            string urlValue = url; 

            if (StringUtil.StringStartsWith(url, "url(")) { 
                int urlIndex = 4;
                int urlLength = url.Length - 4;
                if (StringUtil.StringEndsWith(url, ')')) {
                    urlLength--; 
                }
 
                // extract out the actual URL value 
                urlValue = url.Substring(urlIndex, urlLength).Trim();
            } 

            // write out the "url(" prefix
            writer.Write("url(");
            writer.Write(HttpUtility.UrlPathEncode(urlValue)); 

            // write out the end of the "url()" syntax 
            writer.Write(")"); 
        }
 

        /// 
        /// Holds information about each registered style attribute.
        ///  
        private struct AttributeInformation {
            public string name; 
            public bool isUrl; 
            public bool encode;
 
            public AttributeInformation(string name, bool encode, bool isUrl) {
                this.name = name;
                this.encode = encode;
                this.isUrl = isUrl; 
            }
        } 
    } 

    ///  
    /// Holds information about each style attribute that needs to be rendered.
    /// This is used by the tag rendering API of HtmlTextWriter.
    /// 
    internal struct RenderStyle { 
        public string name;
        public string value; 
        public HtmlTextWriterStyle key; 
    }
}

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