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// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Linq;
using ICSharpCode.NRefactory.CSharp;
using ICSharpCode.NRefactory.PatternMatching;
namespace ICSharpCode.Decompiler.Ast.Transforms
{
/// <summary>
/// Combines query expressions and removes transparent identifiers.
/// </summary>
public class CombineQueryExpressions : IAstTransform
{
readonly DecompilerContext context;
public CombineQueryExpressions(DecompilerContext context)
{
this.context = context;
}
public void Run(AstNode compilationUnit)
{
if (!context.Settings.QueryExpressions)
return;
CombineQueries(compilationUnit);
}
static readonly InvocationExpression castPattern = new InvocationExpression {
Target = new MemberReferenceExpression {
Target = new AnyNode("inExpr"),
MemberName = "Cast",
TypeArguments = { new AnyNode("targetType") }
}};
void CombineQueries(AstNode node)
{
for (AstNode child = node.FirstChild; child != null; child = child.NextSibling) {
CombineQueries(child);
}
QueryExpression query = node as QueryExpression;
if (query != null) {
QueryFromClause fromClause = (QueryFromClause)query.Clauses.First();
QueryExpression innerQuery = fromClause.Expression as QueryExpression;
if (innerQuery != null) {
if (TryRemoveTransparentIdentifier(query, fromClause, innerQuery)) {
RemoveTransparentIdentifierReferences(query);
} else {
QueryContinuationClause continuation = new QueryContinuationClause();
continuation.PrecedingQuery = innerQuery.Detach();
continuation.Identifier = fromClause.Identifier;
fromClause.ReplaceWith(continuation);
}
} else {
Match m = castPattern.Match(fromClause.Expression);
if (m.Success) {
fromClause.Type = m.Get<AstType>("targetType").Single().Detach();
fromClause.Expression = m.Get<Expression>("inExpr").Single().Detach();
}
}
}
}
static readonly QuerySelectClause selectTransparentIdentifierPattern = new QuerySelectClause {
Expression = new Choice {
new AnonymousTypeCreateExpression {
Initializers = {
new NamedExpression {
Name = Pattern.AnyString,
Expression = new IdentifierExpression(Pattern.AnyString)
}.WithName("nae1"),
new NamedExpression {
Name = Pattern.AnyString,
Expression = new AnyNode("nae2Expr")
}.WithName("nae2")
}
},
new AnonymousTypeCreateExpression {
Initializers = {
new NamedNode("identifier", new IdentifierExpression(Pattern.AnyString)),
new AnyNode("nae2Expr")
}
}
}};
bool IsTransparentIdentifier(string identifier)
{
return identifier.StartsWith("<>", StringComparison.Ordinal) && identifier.Contains("TransparentIdentifier");
}
bool TryRemoveTransparentIdentifier(QueryExpression query, QueryFromClause fromClause, QueryExpression innerQuery)
{
if (!IsTransparentIdentifier(fromClause.Identifier))
return false;
Match match = selectTransparentIdentifierPattern.Match(innerQuery.Clauses.Last());
if (!match.Success)
return false;
QuerySelectClause selectClause = (QuerySelectClause)innerQuery.Clauses.Last();
NamedExpression nae1 = match.Get<NamedExpression>("nae1").SingleOrDefault();
NamedExpression nae2 = match.Get<NamedExpression>("nae2").SingleOrDefault();
if (nae1 != null && nae1.Name != ((IdentifierExpression)nae1.Expression).Identifier)
return false;
Expression nae2Expr = match.Get<Expression>("nae2Expr").Single();
IdentifierExpression nae2IdentExpr = nae2Expr as IdentifierExpression;
if (nae2IdentExpr != null && (nae2 == null || nae2.Name == nae2IdentExpr.Identifier)) {
// from * in (from x in ... select new { x = x, y = y }) ...
// =>
// from x in ... ...
fromClause.Remove();
selectClause.Remove();
// Move clauses from innerQuery to query
QueryClause insertionPos = null;
foreach (var clause in innerQuery.Clauses) {
query.Clauses.InsertAfter(insertionPos, insertionPos = clause.Detach());
}
} else {
// from * in (from x in ... select new { x = x, y = expr }) ...
// =>
// from x in ... let y = expr ...
fromClause.Remove();
selectClause.Remove();
// Move clauses from innerQuery to query
QueryClause insertionPos = null;
foreach (var clause in innerQuery.Clauses) {
query.Clauses.InsertAfter(insertionPos, insertionPos = clause.Detach());
}
string ident;
if (nae2 != null)
ident = nae2.Name;
else if (nae2Expr is IdentifierExpression)
ident = ((IdentifierExpression)nae2Expr).Identifier;
else if (nae2Expr is MemberReferenceExpression)
ident = ((MemberReferenceExpression)nae2Expr).MemberName;
else
throw new InvalidOperationException("Could not infer name from initializer in AnonymousTypeCreateExpression");
query.Clauses.InsertAfter(insertionPos, new QueryLetClause { Identifier = ident, Expression = nae2Expr.Detach() });
}
return true;
}
/// <summary>
/// Removes all occurrences of transparent identifiers
/// </summary>
void RemoveTransparentIdentifierReferences(AstNode node)
{
foreach (AstNode child in node.Children) {
RemoveTransparentIdentifierReferences(child);
}
MemberReferenceExpression mre = node as MemberReferenceExpression;
if (mre != null) {
IdentifierExpression ident = mre.Target as IdentifierExpression;
if (ident != null && IsTransparentIdentifier(ident.Identifier)) {
IdentifierExpression newIdent = new IdentifierExpression(mre.MemberName);
mre.TypeArguments.MoveTo(newIdent.TypeArguments);
newIdent.CopyAnnotationsFrom(mre);
newIdent.RemoveAnnotations<PropertyDeclaration>(); // remove the reference to the property of the anonymous type
mre.ReplaceWith(newIdent);
return;
}
}
}
}
}
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