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MutatR.tt
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MutatR.tt
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<#@ template debug="true" hostspecific="true" language="C#" #>
<#@ output extension=".generated.cs" #>
<#@ assembly name="System.Core" #>
<#@ assembly name="Microsoft.VisualStudio.Shell.Interop.8.0" #>
<#@ assembly name="EnvDTE" #>
<#@ assembly name="EnvDTE80" #>
<#@ assembly name="VSLangProj" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="Microsoft.VisualStudio.Shell.Interop" #>
<#@ import namespace="EnvDTE" #>
<#@ import namespace="EnvDTE80" #>
<#@ import namespace="Microsoft.VisualStudio.TextTemplating" #>
using System;
namespace MutatR
{
[AttributeUsage(AttributeTargets.Class)]
public class ImmutableAttribute : Attribute
{
}
}
<#
const string MutatRImmutableAttributeFullName = "MutatR.ImmutableAttribute";
foreach(var codeNamespace in GetNamespaceElements())
{
var namespaceName = codeNamespace.FullName;
var classes = codeNamespace.Members.OfType<CodeClass>().Where(c=>!string.IsNullOrEmpty(c.Name));
var markedClasses = classes.Where(c=>c.Attributes.OfType<CodeAttribute>().Any(attr=>attr.FullName == MutatRImmutableAttributeFullName)).ToList();
if(!markedClasses.Any())
continue;
#>
namespace <#=namespaceName#>
{
<#
foreach(var codeClass in markedClasses)
{
var className = codeClass.Name;
var parameters = new List<Tuple<string, string>>();
FillParametersList(codeClass, parameters);
#>
partial class <#=className#>
{
private <#=className#>(<#=BuildConstructorParametersExpression(parameters)#>)
{
<#
foreach(var param in parameters)
{
#>
this.<#=param.Item2#> = <#=GetParameterName(param.Item2)#>;
<#
}
#>
}
public MutationContext Mutate()
{
return new MutationContext(this);
}
public static implicit operator <#=className#>(MutationContext ctx)
{
return ctx.Commit();
}
public struct MutationContext
{
<#
foreach(var param in parameters)
{
#>
private <#=param.Item1#> <#=GetParameterName(param.Item2)#>;
<#
}
#>
public MutationContext(<#=className#> target)
{
<#
foreach(var param in parameters)
{
#>
this.<#=GetParameterName(param.Item2)#> = target.<#=param.Item2#>;
<#
}
#>
}
<#
foreach(var param in parameters)
{
#>
public MutationContext With<#=param.Item2#>(<#=param.Item1#> value)
{
this.<#=GetParameterName(param.Item2)#> = value;
return this;
}
<#
}
#>
public <#=className#> Commit()
{
return new <#=className#>(<#=BuildConstructorCallingExpression(parameters.Select(param=>param.Item2))#>);
}
}
}
<#
}
#>
}
<#
}
#>
<#+
private static string BuildConstructorCallingExpression(IEnumerable<string> parameters)
{
return string.Join(", ", parameters.Select(param=>GetParameterName(param)));
}
private static string BuildConstructorParametersExpression(IEnumerable<Tuple<string, string>> parameters)
{
return string.Join(", ", parameters.Select(p=>$"{p.Item1} {GetParameterName(p.Item2)}"));
}
private static string GetParameterName(string memberName)
{
return char.ToLower(memberName[0]) + memberName.Substring(1);
}
private static void FillParametersList(CodeClass codeClass, List<Tuple<string, string>> parameters)
{
foreach(CodeElement member in codeClass.Members)
{
if(member is CodeProperty)
{
var property = (CodeProperty)member;
if(!IsPropertyAutoGetter(property))
continue;
parameters.Add(Tuple.Create(property.Type.AsFullName, property.Name));
}
else if(member is CodeVariable2)
{
var field = (CodeVariable2)member;
if(!IsReadonlyField(field))
continue;
parameters.Add(Tuple.Create(field.Type.AsFullName, field.Name));
}
}
}
private static bool IsPropertyAutoGetter(CodeProperty property)
{
var setter = property.Setter;
if(setter != null)
return false;
var getter = property.Getter;
try
{
var kind= getter.FunctionKind;
if(kind != vsCMFunction.vsCMFunctionPropertyGet)
return false;
var start = getter.GetStartPoint();
var end = getter.GetEndPoint();
var getterSrc = start.CreateEditPoint().GetText(end);
if(getterSrc.Replace(" ", "") != "get;")
return false;
return true;
}
catch
{
}
return false;
}
private static bool IsReadonlyField(CodeVariable2 field)
{
var constKind = field.ConstKind;
return constKind == vsCMConstKind.vsCMConstKindReadOnly;
}
private IEnumerable<CodeNamespace> GetNamespaceElements()
{
var visualStudio = (Host as IServiceProvider).GetService(typeof(DTE)) as DTE;
var project = visualStudio.Solution.FindProjectItem(Host.TemplateFile).ContainingProject as Project;
var projItems = new List<ProjectItem>();
FillProjectItems(project.ProjectItems, projItems);
var names = new HashSet<string>(projItems
.Where(i => i.FileCodeModel != null)
.SelectMany(i => i.FileCodeModel.CodeElements.OfType<CodeElement>())
.Where(e => e.Kind == vsCMElement.vsCMElementNamespace)
.Select(e => e.FullName));
var codeNs = new List<CodeNamespace>();
FillCodeNamespaces(project.CodeModel.CodeElements.OfType<CodeNamespace>(), codeNs);
return codeNs.Where(ns => names.Contains(ns.FullName));
}
private void FillCodeNamespaces(IEnumerable<CodeNamespace> parents, List<CodeNamespace> all)
{
foreach (var parent in parents)
{
all.Add(parent);
FillCodeNamespaces(parent.Members.OfType<CodeNamespace>(), all);
}
}
private void FillProjectItems(ProjectItems items, List<ProjectItem> ret)
{
if (items == null)
return;
foreach(ProjectItem item in items)
{
ret.Add(item);
FillProjectItems(item.ProjectItems, ret);
}
}
#>