[英]Programmatically compile typescript in C#?
我正在嘗試在C#中編寫一個函數,該函數接收包含typescript代碼的字符串並返回包含JavaScript代碼的字符串。 這有庫函數嗎?
您可以使用Process
來調用編譯器,將--out file.js
指定到臨時文件夾並讀取已編譯文件的內容。
我做了一個小應用程序來做到這一點:
用法
TypeScriptCompiler.Compile(@"C:\tmp\test.ts");
獲取JS string
string javascriptSource = File.ReadAllText(@"C:\tmp\test.js");
完整源代碼和評論:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
try
{
// compiles a TS file
TypeScriptCompiler.Compile(@"C:\tmp\test.ts");
// if no errors were found, read the contents of the compile file
string javascriptSource = File.ReadAllText(@"C:\tmp\test.js");
}
catch (InvalidTypeScriptFileException ex)
{
// there was a compiler error, show the compiler output
Console.WriteLine(ex.Message);
}
Console.ReadKey();
}
}
public static class TypeScriptCompiler
{
// helper class to add parameters to the compiler
public class Options
{
private static Options @default;
public static Options Default
{
get
{
if (@default == null)
@default = new Options();
return @default;
}
}
public enum Version
{
ES5,
ES3,
}
public bool EmitComments { get; set; }
public bool GenerateDeclaration { get; set; }
public bool GenerateSourceMaps { get; set; }
public string OutPath { get; set; }
public Version TargetVersion { get; set; }
public Options() { }
public Options(bool emitComments = false
, bool generateDeclaration = false
, bool generateSourceMaps = false
, string outPath = null
, Version targetVersion = Version.ES5)
{
EmitComments = emitComments;
GenerateDeclaration = generateDeclaration;
GenerateSourceMaps = generateSourceMaps;
OutPath = outPath;
TargetVersion = targetVersion;
}
}
public static void Compile(string tsPath, Options options = null)
{
if (options == null)
options = Options.Default;
var d = new Dictionary<string,string>();
if (options.EmitComments)
d.Add("-c", null);
if (options.GenerateDeclaration)
d.Add("-d", null);
if (options.GenerateSourceMaps)
d.Add("--sourcemap", null);
if (!String.IsNullOrEmpty(options.OutPath))
d.Add("--out", options.OutPath);
d.Add("--target", options.TargetVersion.ToString());
// this will invoke `tsc` passing the TS path and other
// parameters defined in Options parameter
Process p = new Process();
ProcessStartInfo psi = new ProcessStartInfo("tsc", tsPath + " " + String.Join(" ", d.Select(o => o.Key + " " + o.Value)));
// run without showing console windows
psi.CreateNoWindow = true;
psi.UseShellExecute = false;
// redirects the compiler error output, so we can read
// and display errors if any
psi.RedirectStandardError = true;
p.StartInfo = psi;
p.Start();
// reads the error output
var msg = p.StandardError.ReadToEnd();
// make sure it finished executing before proceeding
p.WaitForExit();
// if there were errors, throw an exception
if (!String.IsNullOrEmpty(msg))
throw new InvalidTypeScriptFileException(msg);
}
}
public class InvalidTypeScriptFileException : Exception
{
public InvalidTypeScriptFileException() : base()
{
}
public InvalidTypeScriptFileException(string message) : base(message)
{
}
}
}
也許您可以使用像JavaScriptDotNet這樣的JavaScript解釋器來運行C#中的typescript編譯器tsc.js。
就像是:
string tscJs = File.ReadAllText("tsc.js");
using (var context = new JavascriptContext())
{
// Some trivial typescript:
var typescriptSource = "window.alert('hello world!');";
context.SetParameter("typescriptSource", typescriptSource);
context.SetParameter("result", "");
// Build some js to execute:
string script = tscJs + @"
result = TypeScript.compile(""typescriptSource"")";
// Execute the js
context.Run(script);
// Retrieve the result (which should be the compiled JS)
var js = context.GetParameter("result");
Assert.AreEqual(typescriptSource, js);
}
顯然,代碼需要一些認真的工作。 如果這確實可行,我肯定會對結果感興趣。
您可能還想修改tsc
以便它可以在內存中的字符串上運行,而不是需要文件IO。
TypeScript編譯器文件正式運行在node.js或Windows Script Host上 - 它是用TypeScript本身編寫的(並轉換為JavaScript)。 它需要一個可以訪問文件系統的腳本宿主。
基本上,您可以從任何語言運行TypeScript,只要您可以將其包裝在支持所需文件系統操作的腳本引擎中。
如果你想純粹用C#編譯TypeScript到JavaScript,你最終會編寫一個編譯器的C#克隆。
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