compilerplugins/clang/store/paintmethodconversion.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include "clang/Lex/Lexer.h"
  11
  12 #include "plugin.hxx"
  13 #include <iostream>
  14 #include <fstream>
  15
  16 /**
  17  * Rewrites all Paint method on subclasses of vcl::Window to include RenderContext& as parameter.
  18  *
  19  * run as: make COMPILER_PLUGIN_TOOL=paintmethodconversion UPDATE_FILES=all FORCE_COMPILE=all
  20  */
  21
  22 namespace
  23 {
  24
  25 bool baseCheckNotWindowSubclass(const CXXRecordDecl* aBaseDefinition, void* /*pInput*/)
  26 {
  27     if (aBaseDefinition && aBaseDefinition->getQualifiedNameAsString() == "vcl::Window")
  28     {
  29         return false;
  30     }
  31     return true;
  32 }
  33
  34 bool isDerivedFromWindow(const CXXRecordDecl* decl) {
  35     if (!decl)
  36         return false;
  37     // skip vcl::Window
  38     if (decl->getQualifiedNameAsString() == "vcl::Window")
  39         return false;
  40     if (!decl->forallBases(baseCheckNotWindowSubclass, nullptr, true))
  41         return true;
  42
  43     return false;
  44 }
  45
  46 class PaintMethodConversion: public loplugin::FilteringRewritePlugin<PaintMethodConversion>
  47 {
  48 public:
  49     explicit PaintMethodConversion(InstantiationData const& data):
  50         FilteringRewritePlugin(data)
  51     {}
  52
  53     virtual void run() override
  54     {
  55         TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
  56     }
  57
  58     bool TraverseCXXMethodDecl(const CXXMethodDecl* methodDeclaration)
  59     {
  60         if (!rewriter)
  61             return true;
  62
  63         if (methodDeclaration->getNameAsString() != "Paint")
  64             return true;
  65
  66         if (!isDerivedFromWindow(methodDeclaration->getParent()))
  67         {
  68             return true;
  69         }
  70
  71         unsigned int nNoOfParameters = methodDeclaration->getNumParams();
  72
  73         if (nNoOfParameters == 1) // we expect only one parameter Paint(Rect&)
  74         {
  75             const ParmVarDecl* parameterDecl = methodDeclaration->getParamDecl(0);
  76             if (methodDeclaration->hasBody())
  77             {
  78                 rewriter->InsertText(parameterDecl->getLocStart(), "vcl::RenderContext& /*rRenderContext*/, ", true, true);
  79             }
  80             else
  81             {
  82                 rewriter->InsertText(parameterDecl->getLocStart(), "vcl::RenderContext& rRenderContext, ", true, true);
  83             }
  84         }
  85         return true;
  86     }
  87
  88 };
  89
  90 loplugin::Plugin::Registration<PaintMethodConversion> X("paintmethodconversion", true);
  91
  92 }
  93
  94 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */