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HtmlxToHtml.cs
1using System;
2using System.Collections.Generic;
3using System.IO;
4using System.Threading.Tasks;
5using Waher.Content;
6using Waher.Content.Html;
7using Waher.Content.Html.Elements;
8using Waher.Content.Html.JavaScript;
9using Waher.Events;
10using Waher.IoTGateway.Cssx;
11using Waher.Runtime.Inventory;
12using Waher.Runtime.IO;
13using Waher.Script;
14
15namespace Waher.IoTGateway.Htmlx
16{
20 public class HtmlxToHtml : IContentConverter
21 {
25 public HtmlxToHtml()
26 {
27 }
28
32 public string[] FromContentTypes => new string[] { HtmlxDecoder.DefaultContentType };
33
37 public string[] ToContentTypes => new string[] { HtmlCodec.DefaultContentType };
38
42 public Grade ConversionGrade => Grade.Perfect;
43
49 public async Task<bool> ConvertAsync(ConversionState State)
50 {
51 string Htmlx;
52
53 using (StreamReader rd = new StreamReader(State.From))
54 {
55 Htmlx = await rd.ReadToEndAsync();
56 }
57
58 if (!(State.Progress is null))
59 {
60 string Head = HtmlDocument.GetHead(Htmlx);
61 if (!string.IsNullOrEmpty(Head))
62 {
63 try
64 {
65 HtmlDocument Doc = new HtmlDocument("<html><head>" + Head + "</head><body></body></html>");
66
67 if (Doc.Head?.HasChildren ?? false)
68 {
69 foreach (HtmlNode N in Doc.Head.Children)
70 {
71 if (!(N is HtmlElement E))
72 continue;
73
74 switch (E.LocalName.ToUpper())
75 {
76 case "LINK":
77 string Rel = E.GetAttribute("rel");
78 if (Rel == "stylesheet")
79 {
80 string HRef = E.GetAttribute("href");
81
82 if (!string.IsNullOrEmpty(HRef))
83 {
84 await State.Progress.EarlyHint(HRef, "preload",
85 new KeyValuePair<string, string>("as", "style"));
86 }
87 }
88 break;
89
90 case "SCRIPT":
91 string Type = E.GetAttribute("type");
92 if (Type == JavaScriptCodec.DefaultContentType)
93 {
94 string Src = E.GetAttribute("src");
95
96 if (!string.IsNullOrEmpty(Src))
97 {
98 await State.Progress.EarlyHint(Src, "preload",
99 new KeyValuePair<string, string>("as", "script"));
100 }
101 }
102 break;
103 }
104 }
105 }
106 }
107 catch (Exception ex)
108 {
109 Log.Exception(ex);
110 }
111 }
112
113 await State.Progress.HeaderProcessed();
114 }
115
116 string Html = await Convert(Htmlx, State, State.FromFileName);
117 if (State.HasError)
118 return false;
119
120 if (!(State.Progress is null))
121 await State.Progress.BodyProcessed();
122
123 byte[] Data = Strings.Utf8WithBom.GetBytes(Html);
124 await State.To.WriteAsync(Data, 0, Data.Length);
125 State.ToContentType += "; charset=utf-8";
126
127 return false;
128 }
129
137 public static Task<string> Convert(string Htmlx, ConversionState State, string FileName)
138 {
139 return Convert(Htmlx, State, State.Session, FileName, true);
140 }
141
149 public static Task<string> Convert(string Htmlx, Variables Session, string FileName)
150 {
151 return Convert(Htmlx, null, Session, FileName, true);
152 }
153
164 internal static Task<string> Convert(string Htmlx, ConversionState State, Variables Session, string FileName, bool LockSession)
165 {
166 return CssxToCss.Convert(Htmlx, "{{", "}}", State, Session, FileName, LockSession);
167 }
168
169 }
170}
Waher.Content.ConversionState
Contains the state of a content conversion process.
Definition: ConversionState.cs:21
Waher.Content.ConversionState.Session
Variables Session
Session states.
Definition: ConversionState.cs:100
Waher.Content.ConversionState.HasError
bool HasError
If an error should be returned.
Definition: ConversionState.cs:126
Waher.Content.ConversionState.To
Stream To
Stream pointing to where binary representation of content is to be sent.
Definition: ConversionState.cs:95
Waher.Content.ConversionState.FromFileName
string FromFileName
If the content is coming from a file, this parameter contains the name of that file....
Definition: ConversionState.cs:74
Waher.Content.ConversionState.Progress
ICodecProgress Progress
Optional interface for reporting progress during conversion.
Definition: ConversionState.cs:105
Waher.Content.ConversionState.From
Stream From
Stream pointing to binary representation of content.
Definition: ConversionState.cs:68
Waher.Content.Html.Elements.Data
DATA element
Definition: Data.cs:7
Waher.Content.Html.Elements.Head
HEAD element
Definition: Head.cs:7
Waher.Content.Html.Elements.Html
HTML element
Definition: Html.cs:7
Waher.Content.Html.HtmlDocument
HTML document.
Definition: HtmlDocument.cs:15
Waher.Content.Html.HtmlDocument.GetHead
static string GetHead(string Html)
Extracts the contents of the HEAD element in a HTML string.
Definition: HtmlDocument.cs:2103
Waher.Content.Html.HtmlDocument.Head
Head Head
First HEAD element of document, if found, null otherwise.
Definition: HtmlDocument.cs:109
Waher.Content.Html.HtmlElement
Base class for all HTML elements.
Definition: HtmlElement.cs:13
Waher.Content.Html.HtmlElement.HasChildren
bool HasChildren
If the element has children.
Definition: HtmlElement.cs:105
Waher.Content.Html.HtmlElement.Children
IEnumerable< HtmlNode > Children
Child nodes, or null if none.
Definition: HtmlElement.cs:115
Waher.Content.Html.HtmlNode
Base class for all HTML nodes.
Definition: HtmlNode.cs:11
Waher.Content.Html.JavaScript.JavaScriptCodec
JavaScript encoder/decoder.
Definition: JavascriptCodec.cs:14
Waher.Content.Html.JavaScript.JavaScriptCodec.DefaultContentType
const string DefaultContentType
application/javascript
Definition: JavascriptCodec.cs:25
Waher.Events.Log
Static class managing the application event log. Applications and services log events on this static ...
Definition: Log.cs:14
Waher.Events.Log.Exception
static void Exception(Exception Exception, string Object, string Actor, string EventId, EventLevel Level, string Facility, string Module, params KeyValuePair< string, object >[] Tags)
Logs an exception. Event type will be determined by the severity of the exception.
Definition: Log.cs:1657
Waher.IoTGateway.Cssx.CssxToCss
Converts CSSX-files to CSS, by evaluating emebedded script and replacing it with results.
Definition: CssxToCss.cs:21
Waher.IoTGateway.Cssx.CssxToCss.Convert
static Task< string > Convert(string Cssx, ConversionState State, string FileName)
Converts CSSX to CSS, using the current theme
Definition: CssxToCss.cs:76
Waher.IoTGateway.Htmlx.HtmlxToHtml
Converts HTMLX-files to HTML, by evaluating emebedded script and replacing it with results.
Definition: HtmlxToHtml.cs:21
Waher.IoTGateway.Htmlx.HtmlxToHtml.ConvertAsync
async Task< bool > ConvertAsync(ConversionState State)
Performs the actual conversion.
Definition: HtmlxToHtml.cs:49
Waher.IoTGateway.Htmlx.HtmlxToHtml.ConversionGrade
Grade ConversionGrade
How well the content is converted.
Definition: HtmlxToHtml.cs:42
Waher.IoTGateway.Htmlx.HtmlxToHtml.Convert
static Task< string > Convert(string Htmlx, Variables Session, string FileName)
Converts HTMLX to HTML, using the current theme
Definition: HtmlxToHtml.cs:149
Waher.IoTGateway.Htmlx.HtmlxToHtml.FromContentTypes
string[] FromContentTypes
Converts content from these content types.
Definition: HtmlxToHtml.cs:32
Waher.IoTGateway.Htmlx.HtmlxToHtml.HtmlxToHtml
HtmlxToHtml()
Converts HTMLX-files to HTML, by evaluating emebedded script and replacing it with results.
Definition: HtmlxToHtml.cs:25
Waher.IoTGateway.Htmlx.HtmlxToHtml.Convert
static Task< string > Convert(string Htmlx, ConversionState State, string FileName)
Converts HTMLX to HTML, using the current theme
Definition: HtmlxToHtml.cs:137
Waher.IoTGateway.Htmlx.HtmlxToHtml.ToContentTypes
string[] ToContentTypes
Converts content to these content types.
Definition: HtmlxToHtml.cs:37
Waher.Runtime.IO.Strings
Static class managing binary representations of strings.
Definition: Strings.cs:10
Waher.Runtime.IO.Strings.Utf8WithBom
static Encoding Utf8WithBom
UTF-8 encoding with Byte Order Mark (BOM)
Definition: Strings.cs:231
Waher.Script.Variables
Collection of variables.
Definition: Variables.cs:25
Waher.Content.ICodecProgress.HeaderProcessed
Task HeaderProcessed()
Called when the header has been processed.
Waher.Content.ICodecProgress.EarlyHint
Task EarlyHint(string Resource, string Relation, params KeyValuePair< string, string >[] AdditionalParameters)
Reports an early hint of a resource the recipient may need to process, in order to be able to process...
Waher.Content.ICodecProgress.BodyProcessed
Task BodyProcessed()
Called when the body has been processed.
Waher.Content.IContentConverter
Basic interface for Internet Content encoders. A class implementing this interface and having a defau...
Definition: IContentConverter.cs:11
Waher.Content.Html.Elements
Definition: A.cs:2
Waher.Content.Html.JavaScript
Definition: JavascriptCodec.cs:9
Waher.Content.Html
Definition: CDATA.cs:6
Waher.Content
Definition: Array.cs:6
Waher.Runtime.Inventory.Grade
Grade
Grade enumeration
Definition: Grade.cs:7