public string Transform(string originalText, TransformingContext context)
{
var genericCount = context.RepeatIndex + 2;
var content = originalText
// 替换泛型。
.Replace("<out T>", FromTemplate("<{0}>", "out T{n}", ", ", genericCount))
.Replace("Task<T>", FromTemplate("Task<({0})>", "T{n}", ", ", genericCount))
.Replace("Func<T, Task>", FromTemplate("Func<{0}, Task>", "T{n}", ", ", genericCount))
.Replace(" T, Task>", FromTemplate(" {0}, Task>", "T{n}", ", ", genericCount))
.Replace("(T, bool", FromTemplate("({0}, bool", "T{n}", ", ", genericCount))
.Replace("var (t, ", FromTemplate("var ({0}, ", "t{n}", ", ", genericCount))
.Replace(", t)", FromTemplate(", {0})", "t{n}", ", ", genericCount))
.Replace("return (t, ", FromTemplate("return ({0}, ", "t{n}", ", ", genericCount))
.Replace("<T>", FromTemplate("<{0}>", "T{n}", ", ", genericCount))
.Replace("{T}", FromTemplate("{{{0}}}", "T{n}", ", ", genericCount))
.Replace("(T value)", FromTemplate("(({0}) value)", "T{n}", ", ", genericCount))
.Replace("(T t)", FromTemplate("({0})", "T{n} t{n}", ", ", genericCount))
.Replace("(t)", FromTemplate("({0})", "t{n}", ", ", genericCount))
.Replace("var t =", FromTemplate("var ({0}) =", "t{n}", ", ", genericCount))
.Replace(" T ", FromTemplate(" ({0}) ", "T{n}", ", ", genericCount))
.Replace(" t;", FromTemplate(" ({0});", "t{n}", ", ", genericCount))
// 生成 [GeneratedCode]。
.Replace(" public interface ", $" {Generatedattribute}{Environment.NewLine} public interface ")
.Replace(" public class ", $" {Generatedattribute}{Environment.NewLine} public class ")
.Replace(" public sealed class ", $" {Generatedattribute}{Environment.NewLine} public sealed class ");
return(content.Trim() + Environment.NewLine + GeneratedFooter);
}
/// <summary>
/// 将原始的单泛型参数的类型源码转换成多泛型参数的源码。
/// </summary>
/// <param name="originalText">原始的单泛型参数的类型源码。</param>
/// <param name="context">转换所需要的上下文信息。</param>
/// <returns>转换后的新文本。</returns>
public string Transform(string originalText, TransformingContext context)
{
// 重复序号为 0, 1, 2…… 但是我们的起始转换泛型个数是 2（1 是手写的，无需转换），所以要增加 2。
var genericCount = context.RepeatIndex + 2;
var content = new StringBuilder(originalText)
// 替换泛型。
.Replace("<out T>", FromTemplate("<{0}>", "out T{n}", ", ", genericCount))
.Replace("Task<T>", FromTemplate("Task<({0})>", "T{n}", ", ", genericCount))
.Replace("Func<T, Task>", FromTemplate("Func<{0}, Task>", "T{n}", ", ", genericCount))
.Replace(" T, Task>", FromTemplate(" {0}, Task>", "T{n}", ", ", genericCount))
.Replace("(T, bool", FromTemplate("({0}, bool", "T{n}", ", ", genericCount))
.Replace("var (t, ", FromTemplate("var ({0}, ", "t{n}", ", ", genericCount))
.Replace(", t)", FromTemplate(", {0})", "t{n}", ", ", genericCount))
.Replace("return (t, ", FromTemplate("return ({0}, ", "t{n}", ", ", genericCount))
.Replace("<T>", FromTemplate("<{0}>", "T{n}", ", ", genericCount))
.Replace("{T}", FromTemplate("{{{0}}}", "T{n}", ", ", genericCount))
.Replace("(T value)", FromTemplate("(({0}) value)", "T{n}", ", ", genericCount))
.Replace("(T t)", FromTemplate("({0})", "T{n} t{n}", ", ", genericCount))
.Replace("(t)", FromTemplate("({0})", "t{n}", ", ", genericCount))
.Replace("var t =", FromTemplate("var ({0}) =", "t{n}", ", ", genericCount))
.Replace(" T ", FromTemplate(" ({0}) ", "T{n}", ", ", genericCount))
.Replace(" t;", FromTemplate(" ({0});", "t{n}", ", ", genericCount))
// 生成 [GeneratedCode]。
.Replace(" public interface ", $" {Generatedattribute}{NewLine} public interface ")
.Replace(" public class ", $" {Generatedattribute}{NewLine} public class ")
.Replace(" public sealed class ", $" {Generatedattribute}{NewLine} public sealed class ")
.AppendLine();
return(GeneratedHeader + content);
}