private static TemplateRenderingResult GetTemplateOutput(Project project, IFileSystem fileSystem, string template, string projectRelativeOutputPath, Hashtable model, bool force)
{
var templateFullPath = FindTemplateAssertExists(project, fileSystem, template);
var templateContent = fileSystem.ReadAllText(templateFullPath);
templateContent = PreprocessTemplateContent(templateContent);
// Create the T4 host and engine
using (var host = new DynamicTextTemplatingEngineHost {
TemplateFile = templateFullPath
}) {
var t4Engine = GetT4Engine();
// Make it possible to reference the same assemblies that your project references
// using <@ Assembly @> directives.
host.AddFindableAssembly(FindProjectAssemblyIfExists(project));
foreach (dynamic reference in ((dynamic)project.Object).References)
{
if ((!string.IsNullOrEmpty(reference.Path)) && (!reference.AutoReferenced))
{
host.AddFindableAssembly(reference.Path);
}
}
string projectRelativeOutputPathWithExtension = null;
ProjectItem existingOutputProjectItem = null;
if (!string.IsNullOrEmpty(projectRelativeOutputPath))
{
// Respect the <#@ Output Extension="..." #> directive
projectRelativeOutputPathWithExtension = projectRelativeOutputPath + GetOutputExtension(host, t4Engine, templateContent);
// Resolve the output path and ensure it doesn't already exist (unless "Force" is set)
var outputDiskPath = Path.Combine(project.GetFullPath(), projectRelativeOutputPathWithExtension);
existingOutputProjectItem = project.GetProjectItem(projectRelativeOutputPathWithExtension);
if (existingOutputProjectItem != null)
{
outputDiskPath = existingOutputProjectItem.GetFullPath();
}
if ((!force) && fileSystem.FileExists(outputDiskPath))
{
return(new TemplateRenderingResult(projectRelativeOutputPathWithExtension)
{
SkipBecauseFileExists = true
});
}
}
// Convert the incoming Hashtable to a dynamic object with properties for each of the Hashtable entries
host.Model = DynamicViewModel.FromObject(model);
// Run the text transformation
var templateOutput = t4Engine.ProcessTemplate(templateContent, host);
return(new TemplateRenderingResult(projectRelativeOutputPathWithExtension)
{
Content = templateOutput,
Errors = host.Errors,
ExistingProjectItemToOverwrite = existingOutputProjectItem,
});
}
}
static string ProcessTemplate(string exampleTemplateName, DynamicViewModel model)
{
var templateQualifiedFileName = ExampleTemplates.GetPath(exampleTemplateName);
if (!File.Exists(templateQualifiedFileName))
{
throw new FileNotFoundException("File not found: " + exampleTemplateName);
}
// Read the text template.
string input = File.ReadAllText(templateQualifiedFileName);
// Eliminate Inherits="DynamicTransform" from template directive
input = Regex.Replace(input, @"\<\#\@\s*\bTemplate\b(.*?\b)?Inherits=""DynamicTransform""\s*(.*?)\#\>", @"<#@ Template $1 $2 #>", RegexOptions.Singleline | RegexOptions.IgnoreCase);
// Append "Model" property (all example templates are C#)
input += ModelPropertyClassFeatures.ModelPropertySourceForLanguage["cs"];
// Transform the text template.
using (var host = new DynamicTextTemplatingEngineHost {
TemplateFile = templateQualifiedFileName,
Model = model
}) {
string output = new Engine().ProcessTemplate(input, host);
if (host.Errors.HasErrors)
{
throw new TemplateProcessingErrorException(host.Errors);
}
return(output);
}
}
private static string GetOutputExtension(DynamicTextTemplatingEngineHost host, ITextTemplatingEngine t4Engine, string templateContent)
{
string ignoredLanguage;
string[] ignoreReferences;
t4Engine.PreprocessTemplate(templateContent, host, "DummyClass", "DummyNamespace", out ignoredLanguage, out ignoreReferences);
return(host.FileExtension ?? string.Empty);
}
