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using System;
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using System.IO;
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using System.Linq;
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using Microsoft.AspNet.Http;
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using Microsoft.AspNet.Mvc;
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using Microsoft.AspNet.Mvc.ModelBinding;
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using Microsoft.AspNet.Mvc.Rendering;
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using Microsoft.AspNet.Mvc.ViewEngines;
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using Microsoft.AspNet.Mvc.ViewFeatures;
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namespace Yavsc.Helpers
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{
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public class TeXString {
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public class Replacement {
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string target;
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string replacement;
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public Replacement(string target, string replacement){
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this.target=target;
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this.replacement=replacement;
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}
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public string Execute(string source)
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{
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return source.Replace(target,replacement);
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}
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}
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public readonly static Replacement[] SpecialCharsRendering =
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{
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new Replacement("<","\\textless"),
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new Replacement(">","\\textgreater"),
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new Replacement("©","\\copyright"),
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new Replacement("®","\\textregistered"),
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new Replacement("\\","\\textbackslash"),
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new Replacement("™","\\texttrademark"),
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new Replacement("¶","\\P"),
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new Replacement("|","\\textbar"),
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new Replacement("%","\\%"),
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new Replacement("{","\\{"),
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new Replacement("}","\\}"),
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new Replacement("_","\\_"),
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new Replacement("#","\\#"),
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new Replacement("$","\\$"),
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new Replacement("_","\\_"),
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new Replacement("¿","\\textquestiondown"),
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new Replacement("§","\\S"),
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new Replacement("£","\\pounds"),
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new Replacement("&","\\&"),
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new Replacement("¡","\\textexclamdown"),
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new Replacement("†","\\dag"),
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new Replacement("–","\\textendash")
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};
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string data;
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public TeXString(string str) {
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data = str;
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foreach (var r in SpecialCharsRendering) {
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data = r.Execute(data);
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}
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}
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override public string ToString()
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{
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return data;
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}
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}
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public static class TeXHelpers
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{
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public static string NewLinesWith(this string target, string separator)
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{
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var items = target.Split(new char[] {'\n'}).Where(
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s=> !string.IsNullOrWhiteSpace(s) ) ;
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return string.Join(separator, items);
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}
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public static TeXString ToTeX(string target, string lineSeparator="\n\\\\")
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{
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if (target==null) return null;
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return new TeXString(target.NewLinesWith(lineSeparator));
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}
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public static string RenderViewToString(
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this Controller controller, IViewEngine engine,
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IHttpContextAccessor httpContextAccessor,
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string viewName, object model)
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{
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using (var sw = new StringWriter())
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{
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if (engine == null)
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throw new InvalidOperationException("no engine");
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// try to find the specified view
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controller.TryValidateModel(model);
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ViewEngineResult viewResult = engine.FindPartialView(controller.ActionContext, viewName);
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// create the associated context
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ViewContext viewContext = new ViewContext();
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viewContext.ActionDescriptor = controller.ActionContext.ActionDescriptor;
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viewContext.HttpContext = controller.ActionContext.HttpContext;
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viewContext.TempData = controller.TempData;
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viewContext.View = viewResult.View;
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viewContext.Writer = sw;
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// write the render view with the given context to the stringwriter
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viewResult.View.RenderAsync(viewContext);
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viewResult.EnsureSuccessful();
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return sw.GetStringBuilder().ToString();
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}
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}
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}
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}
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