Compare 2 cpp files

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Compare two .cpp files and get the changes on the method-level #185

Compare two .cpp files and get the changes on the method-level #185

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First of all, congratulations for this great project! I am trying to use it on my research and I have the following problem:

I would like to compare two cpp files (i.e. apiL.cpp and apiR.cpp ) where apiR.cpp is a newer revision of apiL.cpp . On apiR.cpp some methods/functions added, some methods/functions modified and some methods/functions deleted.
So far I have written the following code:

Run.initGenerators(); String srcFile = "/home/diff/apiL.cpp"; String dstFile = "/home/diff/apiR.cpp"; ITree src = new SrcmlCppTreeGenerator().generateFromFile(srcFile).getRoot(); ITree dst = new SrcmlCppTreeGenerator().generateFromFile(dstFile).getRoot(); Matcher m = Matchers.getInstance().getMatcher(src, dst); ActionGenerator g = new ActionGenerator(src, dst, m.getMappings()); g.generate(); List actions = g.getActions(); 

My question is the following: what should I do in order to get diffs on the method-level between those two files?
Thank you in advance!

The text was updated successfully, but these errors were encountered:

@jrfaller thank you very much for you fast response.
What I would like to achieve, is the following.
Let’s say that the file apiL.cpp has the following functions:

void foo() < . >void bar() < . >void zxy()

On the newer revision apiR.cpp the functions look like this:

void bar() < . print("function bar updated/modified") >void zxy() < . >void newFunction()

1. the function void bar() deleted
2. the function void bar() updated, one print statement added
3. the function void zxy() remained unchanged
4. a new function inserted void newFunction()

Is there a way to get that kind of info and ideally the span of the methods (start at Line X ends at Line Y)?
Thank you in advance!

Ok I understand your motivation.

Note that gumtree will produce «fine-grained» diff therefore for the bar function you will not have readily the information that it has been updated, you will rather have directly the inserted statement and will have to resort to some post processing to know that it belongs to the bar method. For the deleted / inserted method, if everything goes as expected however you will have the inserted / deleted subtree corresponding to the function declaration.

To have a quick clue of what you can get, I recommend you to update to the latest develop commit of GumTree and try the gumtree textdiff command on your pair of files.

Also I don’t know if you are working on this for a PhD topic, but if you want you can contact me by mail to explain me your project it can interest us as we are also working on the API evolution topic in my research team!

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Compare CPP Files in C# .NET

.NET documents comparison API to detect the changes between two versions of CPP files and export to a final document with a detailed summary of the differences between the compared documents.

GroupDocs.Comparison

About GroupDocs.Comparison for .NET API

GroupDocs.Comparison for .NET is a native .NET API for comparing multiple images and documents of the same format. It helps you detect the differences within paragraphs, words, characters, shapes, even the text styles of the compared documents, merge the changes and export to a final document. It supports comparing and merging PDF, Word documents, Excel spreadsheets, PowerPoint presentations, Visio diagrams, Outlook emails, HTML, drawings and image file formats without using any external library.

Steps for Comparing CPP Files in C#

GroupDocs.Comparison makes it easy for .NET developers to compare & merge multiple CPP files in their applications by implementing a few easy steps.

• Instantiate Comparer object with source document path or stream.
• Call Add method and specify target document path or stream. Repeat this step for every target document.
• Call Compare method.

System Requirements

GroupDocs.Comparison for .NET APIs are supported on all major platforms and operating systems. Before executing the code below, please make sure that you have the following prerequisites installed on your system.

• Operating Systems: Microsoft Windows, Linux, MacOS
• Development Environments: Microsoft Visual Studio, Xamarin, MonoDevelop
• Frameworks: .NET Framework, .NET Standard, .NET Core, Mono
• Get the latest version of GroupDocs.Comparison for .NET downloaded from NuGet

// Compare multiple documents from local disk  using (Comparer comparer = new Comparer("source.cpp"))   comparer.Add("target1.cpp");  comparer.Add("target2.cpp");  comparer.Add("target3.cpp");  comparer.Compare("result.cpp"); // Create result file with the specified name >  // Compare multiple documents from stream  using (Comparer comparer = new Comparer(File.OpenRead("source.cpp")))   comparer.Add(File.OpenRead("target1.cpp"));  comparer.Add(File.OpenRead("target2.cpp"));  comparer.Add(File.OpenRead("target3.cpp"));  comparer.Compare(File.Create("result.cpp")); // Create result file with the specified name > 

Live Demos of Comparing CPP Files

Detect differences between CPP files right now by visiting GroupDocs.Comparison Live Demos website.
The live demo has the following benefits

No need to write any code

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Compare CPP Files in Java

Perform a line-by-line comparison between more than two CPP files in Java. Retrieve a list of differences and save the compared files to a single document.

GroupDocs.Comparison

About GroupDocs.Comparison for Java API

Empower your Java applications with images and documents comparison features using GroupDocs.Comparison for Java API. It helps you identify the differences within paragraphs, words, characters, shapes, even the text styles of the compared documents of same format, allows merging the changes and export to a final document. It supports comparing and merging a wide range of documents including PDF, Word, Excel worksheets, PowerPoint presentations, Visio diagrams, Outlook emails, HTML, drawings and image file formats without using any external library.

Steps for Comparing CPP Files in Java

GroupDocs.Comparison makes it easy for Java developers to compare CPP files within their applications using a few lines of code.

• Instantiate Comparer object with source document path or stream.
• Call add method and specify target document path or stream.
• Call compare method.

System Requirements

GroupDocs.Comparison for Java APIs are supported on all major platforms and operating systems. Before executing the code below, please make sure that you have the following prerequisites installed on your system.

• Operating Systems: Microsoft Windows, Linux, MacOS
• Development Environment: NetBeans, Intellij IDEA, Eclipse etc
• Java Runtime Environment: J2SE 6.0 and above
• Get the latest version of GroupDocs.Comparison for Java from Maven

// Compare documents from local file  try (Comparer comparer = new Comparer("C:\\source.cpp"))   comparer.add("C:\\target.cpp");  comparer.compare("C:\\result.cpp"); // Create result file with the specified name  >  // Compare documents from stream  try (Comparer comparer = new Comparer(new FileInputStream("C:\\source.cpp")))   comparer.add(new FileInputStream("C:\\target.cpp"));  comparer.compare(new FileOutputStream("C:\\result.cpp")); // Create result file with the specified name  > 

Live Demos to Compare CPP Files

Compare CPP files right now by visiting GroupDocs.Comparison Live Demos website.
The live demo has the following benefits

No need to write any code

Just upload the source file

Get download link to save the file

About CPP File Format

Files with CPP file extension are source code files for applications written in C++ programming language. A single C++ project may contain more than one CPP files as application source code. Such a project consists of different file types, of which the CPP files are known as implementation files as they contain all the definitions of the methods declared in the header (.h) file. The C++ project as a whole results in an executable application when compiled as a whole.

Compare Other File Formats

Multi format images & documents comparison API for Java. Compare some of the popular file formats below without any external software.

Compare PDF Files

(Adobe Portable Document Format)

Compare DOC Files

Compare DOCM Files

(Microsoft Word Macro-Enabled Document)

Compare DOCX Files

(Microsoft Word Open XML Document)

Compare DOT Files

(Microsoft Word Document Template)

Compare DOTM Files

(Microsoft Word Macro-Enabled Template)

Compare DOTX Files

(Word Open XML Document Template)

Compare RTF Files

Compare TXT Files

Compare XLS Files

(Microsoft Excel Binary File Format)

Compare XLSX Files

(Microsoft Excel Open XML Spreadsheet)

Compare XLTM Files

(Microsoft Excel macro-enabled template)

Compare XLSM Files

(Microsoft Excel Macro-Enabled Spreadsheet)

Compare XLSB Files

(Microsoft Excel Binary Spreadsheet File)

Compare CSV Files

(Comma Separated Values File)

Compare PPT Files

Compare PPS Files

(Microsoft PowerPoint Slide Show)

Compare PPTX Files

(PowerPoint Open XML Presentation)

Compare PPSX Files

(PowerPoint Open XML Slide Show)

Compare POT Files

(Microsoft PowerPoint template)

Compare POTX Files

(Microsoft PowerPoint Open XML Template)

Compare ODS Files

(Open Document Spreadsheet)

Compare ODP Files

(OpenDocument Presentation File Format)

Compare OTP Files

Compare ODT Files

Compare OTT Files

Compare VST Files

(Microsoft Visio 2003-2010 XML Drawing)

Compare JPEG Files

Compare PNG Files

Compare GIF Files

(Graphical Interchange Format File)

Compare BMP Files

Compare HTML Files

(Hyper Text Markup Language)

Compare MHT Files

Compare MHTML Files

(MIME Encapsulation of Aggregate HTML)

Compare MSG Files

(Microsoft Outlook E-mail Message)

Compare EML Files

Compare EMLX Files

Compare ONE Files

Compare VSD Files

(Microsoft Visio 2003-2010 Drawing)

Compare VSDX Files

Compare VSS Files

(Microsoft Visio 2003-2010 Stencil)

Compare VST Files

(Microsoft Visio 2003-2010 Template)

Compare VDX Files

(Microsoft Visio 2003-2010 XML Drawing)

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C++ File Comparison

The following program compares two files for equality.

It does so by using the binary file functions read(), eof(), and gcount().

The program first opens the files for binary operations.

Next, it reads one buffer at a time from each of the files and compares the contents.

Since less than a full buffer may be read, it uses the gcount() function to determine precisely how many characters are in the buffers.

// Compare files. #include #include using namespace std; int main(int argc, char *argv[]) < register int i; unsigned char buf1[1024], buf2[1024]; ifstream f1("main.cpp", ios::in | ios::binary); if(!f1) /* ww w . d em o 2 s . c o m */ cout "Cannot open first file.\n"; return 1; > ifstream f2("main.cpp", ios::in | ios::binary); if(!f2) < cout "Cannot open second file.\n"; return 1; > cout "Comparing files. \n"; do < f1.read((char *) buf1, sizeof buf1); f2.read((char *) buf2, sizeof buf2); if(f1.gcount() != f2.gcount()) < cout "Files are of differing sizes.\n"; f1.close(); f2.close(); return 0; > // compare contents of buffers for(i=0; iif(buf1[i] != buf2[i]) < cout "Files differ.\n"; f1.close(); f2.close(); return 0; > > while(!f1.eof() && !f2.eof()); cout "Files are the same.\n"; f1.close(); f2.close(); return 0; >

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