Update: Text Channel Stuff
Bugs: Files don't work Bugs: Video In-Line don't work Added: idk, everything?
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310
RelayClient/Helpers/SyntaxHighlighter.cs
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310
RelayClient/Helpers/SyntaxHighlighter.cs
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using System.Text.RegularExpressions;
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namespace RelayClient.Helpers;
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public static class SyntaxHighlighter
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{
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private static readonly Color DefaultColor = Color.FromArgb("#D4D4D4");
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private static readonly Color KeywordColor = Color.FromArgb("#569CD6");
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private static readonly Color StringColor = Color.FromArgb("#CE9178");
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private static readonly Color NumberColor = Color.FromArgb("#B5CEA8");
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private static readonly Color CommentColor = Color.FromArgb("#6A9955");
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private static readonly Color TypeColor = Color.FromArgb("#4EC9B0");
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private static readonly Color FunctionColor = Color.FromArgb("#DCDCAA");
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private static readonly Color OperatorColor = Color.FromArgb("#D4D4D4");
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private static readonly Color TagColor = Color.FromArgb("#569CD6");
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private static readonly Color AttrColor = Color.FromArgb("#9CDCFE");
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private const string FontFamily = "AnonymousProRegular";
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private static readonly Dictionary<string, string> Aliases = new(StringComparer.OrdinalIgnoreCase)
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{
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["cs"] = "csharp",
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["c#"] = "csharp",
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["js"] = "javascript",
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["jsx"] = "javascript",
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["ts"] = "typescript",
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["tsx"] = "typescript",
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["py"] = "python",
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["sh"] = "bash",
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["shell"] = "bash",
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["zsh"] = "bash",
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["htm"] = "html",
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["xml"] = "html",
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["yml"] = "yaml"
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};
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private static readonly Dictionary<string, HashSet<string>> Keywords = new(StringComparer.OrdinalIgnoreCase)
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{
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["csharp"] = new(StringComparer.Ordinal)
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{
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"abstract","as","async","await","base","bool","break","byte","case","catch","char","checked",
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"class","const","continue","decimal","default","delegate","do","double","else","enum","event",
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"explicit","extern","false","finally","fixed","float","for","foreach","get","goto","if",
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"implicit","in","int","interface","internal","is","lock","long","namespace","new","null",
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"object","operator","out","override","params","partial","private","protected","public",
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"readonly","record","ref","return","sbyte","sealed","set","short","sizeof","stackalloc",
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"static","string","struct","switch","this","throw","true","try","typeof","uint","ulong",
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"unchecked","unsafe","ushort","using","var","virtual","void","volatile","while","yield",
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"nameof","when","where","global","init","required","file","scoped","with"
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},
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["javascript"] = new(StringComparer.Ordinal)
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{
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"async","await","break","case","catch","class","const","continue","debugger","default",
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"delete","do","else","enum","export","extends","false","finally","for","from","function",
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"get","if","implements","import","in","instanceof","let","new","null","of","package",
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"private","protected","public","return","set","static","super","switch","this","throw",
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"true","try","typeof","undefined","var","void","while","with","yield"
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},
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["typescript"] = new(StringComparer.Ordinal)
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{
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"any","as","async","await","boolean","break","case","catch","class","const","continue",
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"debugger","declare","default","delete","do","else","enum","export","extends","false",
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"finally","for","from","function","get","if","implements","import","in","instanceof",
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"interface","is","keyof","let","namespace","never","new","null","number","of","package",
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"private","protected","public","readonly","return","set","static","string","super",
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"switch","this","throw","true","try","type","typeof","undefined","unknown","var","void",
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"while","with","yield"
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},
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["python"] = new(StringComparer.Ordinal)
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{
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"and","as","assert","async","await","break","class","continue","def","del","elif","else",
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"except","False","finally","for","from","global","if","import","in","is","lambda","None",
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"nonlocal","not","or","pass","raise","return","True","try","while","with","yield","self",
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"cls","match","case"
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},
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["sql"] = new(StringComparer.OrdinalIgnoreCase)
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{
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"select","from","where","insert","update","delete","create","alter","drop","table","index",
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"view","join","inner","outer","left","right","full","cross","on","as","group","by","order",
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"having","distinct","union","all","into","values","set","null","not","and","or","in","like",
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"between","is","true","false","primary","key","foreign","references","default","limit",
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"offset","with","case","when","then","else","end","exists","cast","begin","commit","rollback"
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},
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["bash"] = new(StringComparer.Ordinal)
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{
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"if","then","else","elif","fi","for","in","do","done","while","until","case","esac",
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"function","return","break","continue","exit","echo","printf","export","local","readonly",
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"source","alias","unset","trap","set","eval","exec","shift","let","declare","typeset"
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},
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["json"] = new(StringComparer.Ordinal) { "true","false","null" },
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["yaml"] = new(StringComparer.Ordinal) { "true","false","null","yes","no","on","off" },
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["css"] = new(StringComparer.OrdinalIgnoreCase)
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{
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"important","inherit","initial","unset","auto","none","normal","bold","italic","center",
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"left","right","top","bottom","flex","grid","block","inline","absolute","relative","fixed",
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"sticky","static"
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}
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};
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private static readonly Dictionary<string, Regex> Tokenizers = new(StringComparer.Ordinal);
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static SyntaxHighlighter()
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{
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const RegexOptions opts = RegexOptions.Compiled | RegexOptions.Singleline;
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Tokenizers["csharp"] = new Regex(
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@"(?<comment>//[^\n]*|/\*.*?\*/)" +
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@"|(?<string>@""(?:""""|[^""])*""|\$""(?:\\.|[^""\\])*""|""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*')" +
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@"|(?<number>\b\d+(?:\.\d+)?[fFdDmMuUlL]*\b)" +
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@"|(?<word>[A-Za-z_]\w*)",
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opts);
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Tokenizers["javascript"] = new Regex(
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@"(?<comment>//[^\n]*|/\*.*?\*/)" +
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@"|(?<string>""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*'|`(?:\\.|[^`\\])*`)" +
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@"|(?<number>\b\d+(?:\.\d+)?\b)" +
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@"|(?<word>[A-Za-z_$][\w$]*)",
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opts);
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Tokenizers["typescript"] = Tokenizers["javascript"];
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Tokenizers["python"] = new Regex(
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@"(?<comment>\#[^\n]*)" +
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@"|(?<string>""""""[\s\S]*?""""""|'''[\s\S]*?'''|""(?:\\.|[^""\\])*""|'(?:\\.|[^'\\])*')" +
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@"|(?<number>\b\d+(?:\.\d+)?\b)" +
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@"|(?<word>[A-Za-z_]\w*)",
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opts);
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Tokenizers["sql"] = new Regex(
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@"(?<comment>--[^\n]*|/\*.*?\*/)" +
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@"|(?<string>'(?:''|[^'])*')" +
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@"|(?<number>\b\d+(?:\.\d+)?\b)" +
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@"|(?<word>[A-Za-z_]\w*)",
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opts);
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Tokenizers["bash"] = new Regex(
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@"(?<comment>\#[^\n]*)" +
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@"|(?<string>""(?:\\.|[^""\\])*""|'[^']*')" +
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@"|(?<number>\b\d+\b)" +
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@"|(?<variable>\$\{?[A-Za-z_]\w*\}?)" +
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@"|(?<word>[A-Za-z_][\w-]*)",
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opts);
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Tokenizers["json"] = new Regex(
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@"(?<string>""(?:\\.|[^""\\])*"")" +
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@"|(?<number>-?\b\d+(?:\.\d+)?(?:[eE][+-]?\d+)?\b)" +
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@"|(?<word>true|false|null)",
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opts);
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Tokenizers["yaml"] = new Regex(
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@"(?<comment>\#[^\n]*)" +
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@"|(?<string>""(?:\\.|[^""\\])*""|'[^']*')" +
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@"|(?<key>^[ \t]*[A-Za-z_][\w-]*(?=\s*:))" +
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@"|(?<number>\b\d+(?:\.\d+)?\b)" +
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@"|(?<word>[A-Za-z_][\w-]*)",
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opts | RegexOptions.Multiline);
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Tokenizers["html"] = new Regex(
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@"(?<comment><!--.*?-->)" +
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@"|(?<string>""[^""]*""|'[^']*')" +
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@"|(?<tag></?[A-Za-z][A-Za-z0-9-]*)" +
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@"|(?<attr>\b[A-Za-z_][\w-]*(?==))",
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opts);
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Tokenizers["css"] = new Regex(
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@"(?<comment>/\*.*?\*/)" +
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@"|(?<string>""[^""]*""|'[^']*')" +
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@"|(?<number>-?\b\d+(?:\.\d+)?(?:px|em|rem|%|vh|vw|s|ms|deg)?\b)" +
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@"|(?<selector>[.#]?[A-Za-z_][\w-]*(?=\s*[{,]))" +
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@"|(?<prop>[A-Za-z-]+(?=\s*:))" +
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@"|(?<word>[A-Za-z_][\w-]*)",
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opts);
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Tokenizers["diff"] = new Regex(
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@"(?<add>^\+[^\n]*)" +
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@"|(?<del>^-[^\n]*)" +
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@"|(?<hunk>^@@[^\n]*)",
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opts | RegexOptions.Multiline);
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Tokenizers["markdown"] = new Regex(
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@"(?<header>^#{1,6}[^\n]*)" +
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@"|(?<bold>\*\*[^*\n]+\*\*|__[^_\n]+__)" +
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@"|(?<italic>\*[^*\n]+\*|_[^_\n]+_)" +
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@"|(?<code>`[^`\n]+`)" +
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@"|(?<link>\[[^\]]+\]\([^)]+\))",
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opts | RegexOptions.Multiline);
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}
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public static List<Span> Highlight(string code, string? language, double fontSize)
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{
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var lang = Resolve(language);
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var spans = new List<Span>();
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if (lang is null || !Tokenizers.TryGetValue(lang, out var tokenizer))
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{
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spans.Add(MakeSpan(code, DefaultColor, fontSize));
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return spans;
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}
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var keywords = Keywords.GetValueOrDefault(lang);
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int cursor = 0;
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foreach (Match m in tokenizer.Matches(code))
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{
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if (m.Index > cursor)
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spans.Add(MakeSpan(code[cursor..m.Index], DefaultColor, fontSize));
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spans.Add(SpanForMatch(m, lang, keywords, fontSize));
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cursor = m.Index + m.Length;
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}
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if (cursor < code.Length)
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spans.Add(MakeSpan(code[cursor..], DefaultColor, fontSize));
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return spans;
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}
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private static Span SpanForMatch(Match m, string lang, HashSet<string>? keywords, double fontSize)
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{
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if (m.Groups["comment"].Success)
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return MakeSpan(m.Value, CommentColor, fontSize, italic: true);
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if (m.Groups["string"].Success)
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return MakeSpan(m.Value, StringColor, fontSize);
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if (m.Groups["number"].Success)
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return MakeSpan(m.Value, NumberColor, fontSize);
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if (m.Groups["variable"].Success)
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return MakeSpan(m.Value, AttrColor, fontSize);
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if (m.Groups["tag"].Success)
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return MakeSpan(m.Value, TagColor, fontSize);
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if (m.Groups["attr"].Success)
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return MakeSpan(m.Value, AttrColor, fontSize);
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if (m.Groups["selector"].Success)
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return MakeSpan(m.Value, TypeColor, fontSize);
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if (m.Groups["prop"].Success)
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return MakeSpan(m.Value, AttrColor, fontSize);
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if (m.Groups["key"].Success)
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return MakeSpan(m.Value, AttrColor, fontSize);
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if (m.Groups["add"].Success)
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return MakeSpan(m.Value, Color.FromArgb("#6A9955"), fontSize);
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if (m.Groups["del"].Success)
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return MakeSpan(m.Value, Color.FromArgb("#F48771"), fontSize);
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if (m.Groups["hunk"].Success)
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return MakeSpan(m.Value, KeywordColor, fontSize);
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if (m.Groups["header"].Success)
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return MakeSpan(m.Value, KeywordColor, fontSize, bold: true);
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if (m.Groups["bold"].Success)
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return MakeSpan(m.Value, DefaultColor, fontSize, bold: true);
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if (m.Groups["italic"].Success)
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return MakeSpan(m.Value, DefaultColor, fontSize, italic: true);
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if (m.Groups["code"].Success)
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return MakeSpan(m.Value, StringColor, fontSize);
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if (m.Groups["link"].Success)
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return MakeSpan(m.Value, AttrColor, fontSize);
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if (m.Groups["word"].Success)
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{
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var word = m.Value;
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var compareSet = keywords;
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if (compareSet is not null && compareSet.Contains(word))
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return MakeSpan(word, KeywordColor, fontSize);
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if (lang is "csharp" or "javascript" or "typescript" && word.Length > 0 && char.IsUpper(word[0]))
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return MakeSpan(word, TypeColor, fontSize);
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return MakeSpan(word, DefaultColor, fontSize);
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}
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return MakeSpan(m.Value, DefaultColor, fontSize);
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}
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private static Span MakeSpan(string text, Color color, double fontSize, bool bold = false, bool italic = false)
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{
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var attrs = FontAttributes.None;
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if (bold) attrs |= FontAttributes.Bold;
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if (italic) attrs |= FontAttributes.Italic;
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return new Span
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{
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Text = text,
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TextColor = color,
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FontSize = fontSize,
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FontFamily = FontFamily,
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FontAttributes = attrs
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};
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}
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private static string? Resolve(string? language)
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{
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if (string.IsNullOrWhiteSpace(language)) return null;
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var lower = language.Trim().ToLowerInvariant();
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return Aliases.GetValueOrDefault(lower, lower);
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}
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}
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