private string TransformTemplate(CompileFile assemblyFile)
{
// 读取文件，解析其语法树。
var originalText = File.ReadAllText(assemblyFile.FullName);
var syntaxTree = CSharpSyntaxTree.ParseText(originalText);
var visitor = new PlaceholderVisitor();
visitor.Visit(syntaxTree.GetRoot());
var builder = new StringBuilder();
var currentTextPosition = 0;
var placeholders = visitor.Placeholders;
foreach (var placeholder in placeholders)
{
var actualText = placeholder.Execute(_compilingContext);
builder.Append(originalText.Substring(currentTextPosition, placeholder.Span.Start));
builder.Append(actualText);
currentTextPosition = placeholder.Span.End;
}
builder.Append(originalText.Substring(currentTextPosition, originalText.Length - currentTextPosition));
builder.Replace("[CompileTimeTemplate]", "");
builder.Replace("using dotnetCampus.SourceFusion;", "");
var targetText = builder.ToString();
var fileName = Path.GetFileNameWithoutExtension(assemblyFile.FullName);
var targetFile = Path.Combine(_generatedCodeFolder, $"{fileName}.g.cs");
File.WriteAllText(targetFile, targetText);
return(assemblyFile.FullName);
}
private string TransformTemplate(CompileFile assemblyFile)
{
// 读取文件，去掉非期望字符。
var originalText = File.ReadAllText(assemblyFile.FullName);
originalText = originalText.Replace("[CompileTimeTemplate]", AssemblyInfo.GeneratedCodeAttribute);
originalText = _usingRegex.Replace(originalText, "");
foreach (Match match in _projectPropertyRegex.Matches(originalText))
{
var propertyName = match.Groups["propertyName"].Value;
var propertyValue = _context.GetProperty(propertyName);
originalText = originalText.Replace(match.Value, propertyValue);
}
// 解析其语法树。
var symbols = _context.PreprocessorSymbols.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
var syntaxTree = CSharpSyntaxTree.ParseText(originalText, new CSharpParseOptions(
LanguageVersion.Latest, DocumentationMode.None, SourceCodeKind.Regular, symbols));
// 访问语法节点。
var visitor = new PlaceholderVisitor();
visitor.Visit(syntaxTree.GetRoot());
// 初始化字符串。
var builder = new StringBuilder(AssemblyInfo.GeneratedCodeComment);
var namespaceIndex = builder.Length;
var currentTextPosition = 0;
// 替换占位符。
var placeholders = visitor.Placeholders;
foreach (var placeholder in placeholders)
{
var actualText = placeholder.Fill(_compilingContext);
builder.Append(
originalText.Substring(currentTextPosition, placeholder.Span.Start - currentTextPosition));
builder.Append(actualText);
currentTextPosition = placeholder.Span.End;
}
// 把文件剩余的部分拼接起来。
builder.Append(originalText.Substring(currentTextPosition));
// 去掉原来的命名空间，添加上新补充的命名空间。
var requiredNamespaces = string.Join(Environment.NewLine, placeholders
.SelectMany(x => x.RequiredNamespaces)
.Union(visitor.Namespaces.Select(x => x.@namespace))
.Distinct()
.OrderBy(s => s, new SystemFirstNamespaceComparer())
.Select(x => $"using {x};"));
var namespaceStart = visitor.Namespaces.Min(x => x.span.Start);
var namespaceEnd = visitor.Namespaces.Max(x => x.span.End);
builder.Remove(namespaceIndex, namespaceEnd - namespaceStart);
builder.Insert(namespaceIndex, requiredNamespaces);
// 将新的代码写入到文件。
var targetText = builder.ToString();
var fileName = Path.GetFileNameWithoutExtension(assemblyFile.FullName);
var targetFile = Path.Combine(_generatedCodeFolder, $"{fileName}.g.cs");
File.WriteAllText(targetFile, targetText);
return(assemblyFile.FullName);
}