FileComparison.hpp

/*

Copyright (c) 2005-2018, University of Oxford.
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This file is part of Chaste.

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modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 * Neither the name of the University of Oxford nor the names of its
   contributors may be used to endorse or promote products derived from this
   software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/
#ifndef FILECOMPARISON_HPP_
#define FILECOMPARISON_HPP_

#include "AbstractFileComparison.hpp"
#include <vector>
#include <boost/foreach.hpp>

class FileComparison : public AbstractFileComparison
{
private:
    bool mIgnoreCommentLines;

    bool mIgnoreBlankLines;

    std::vector<std::string> mCommentLineStarts;

    std::vector<std::string> mIgnorableContent;

public:
    FileComparison(std::string fileName1, std::string fileName2, bool calledCollectively=true, bool suppressOutput = false)
        : AbstractFileComparison(fileName1, fileName2, calledCollectively, suppressOutput),
          mIgnoreCommentLines(true),
          mIgnoreBlankLines(false)
    {
        SetupCommentLines();
    }

    FileComparison(const FileFinder& rFileName1, const FileFinder& rFileName2, bool calledCollectively=true, bool suppressOutput = false)
        : AbstractFileComparison(rFileName1, rFileName2, calledCollectively, suppressOutput),
          mIgnoreCommentLines(true),
          mIgnoreBlankLines(false)
    {
        SetupCommentLines();
    }

    void SetupCommentLines()
    {
        mCommentLineStarts.push_back("#");
        mCommentLineStarts.push_back("!");
        mCommentLineStarts.push_back("Created by Chaste");
        mCommentLineStarts.push_back("<!-- Created by Chaste");
    }

    void SetIgnoreCommentLines(bool ignore=true)
    {
        mIgnoreCommentLines = ignore;
        if (!ignore)
        {
            mCommentLineStarts.clear();
        }
    }

    void IgnoreBlankLines(bool ignore=true)
    {
        mIgnoreBlankLines = ignore;
    }

    void SetIgnoreLinesBeginningWith(std::string lineStart)
    {
        mIgnoreCommentLines = true;
        mCommentLineStarts.push_back(lineStart);
    }

    void IgnoreLinesContaining(const std::string& rIgnorableText)
    {
        mIgnorableContent.push_back(rIgnorableText);
    }

    bool CompareFiles(unsigned ignoreFirstFewLines=0, bool doTsAssert=true)
    {
        // Usually only the master process does the checking, this can be switched off in the constructor.
        if (mCalledCollectively && !PetscTools::AmMaster())
        {
            return true;
        }

        std::string data1;
        std::string data2;
        unsigned failures = 0;
        unsigned max_display_failures = 10;

        SkipHeaderLines(ignoreFirstFewLines);

        bool files_empty = false;
        do
        {
            std::string buffer1;
            std::string buffer2;
            getline(*mpFile1, buffer1);
            getline(*mpFile2, buffer2);

            if (mIgnoreBlankLines)
            {
                // Keep reading lines until we see non-blank, end-of-file or read error
                while (buffer1.empty() && mpFile1->good())
                {
                    getline(*mpFile1, buffer1);
                }
                while (buffer2.empty() && mpFile2->good())
                {
                    getline(*mpFile2, buffer2);
                }
            }

            if (mIgnoreCommentLines)
            {
                bool skip_this_line = false;
                for (unsigned i=0; i<mCommentLineStarts.size(); i++)
                {
                    // Check for lines starting with a comment symbol
                    size_t found1 = buffer1.find(mCommentLineStarts[i]);
                    size_t found2 = buffer2.find(mCommentLineStarts[i]);
                    if (found1 == 0 && found2 == 0)
                    {
                        skip_this_line = true;
                        break;
                    }
                }
                if (skip_this_line)
                {
                    continue;
                }
            }

            // Check for lines containing ignorable text
            if (!mIgnorableContent.empty())
            {
                bool skip_this_line = false;
                BOOST_FOREACH(const std::string& rText, mIgnorableContent)
                {
                    size_t found1 = buffer1.find(rText);
                    size_t found2 = buffer2.find(rText);
                    if (found1 != std::string::npos && found2 != std::string::npos)
                    {
                        skip_this_line = true;
                        break;
                    }
                }
                if (skip_this_line)
                {
                    continue;
                }
            }

            if (!(buffer1==buffer2) && !files_empty)
            {
                if (failures++ < max_display_failures && !mSuppressOutput)
                {
                    // Display error
                    std::stringstream message;
                    message << "Line " << mLineNum << " differs in files " << mFilename1 << " and " << mFilename2;

                    TS_TRACE(message.str());
                    TS_TRACE( buffer1 );
                    TS_TRACE( buffer2 );
                }
            }
            mLineNum++;
        }
        while (mpFile1->good() && mpFile2->good());
        // If either is not good(), then it means that there's nothing to read from the file, or a file input error.

        if (doTsAssert)
        {
            // Force CxxTest error if there were any major differences
            TS_ASSERT_EQUALS(failures, 0u);
            // If that assertion tripped...
            if (failures > 0u && !mSuppressOutput)
            {
                // Report the paths to the files
                TS_TRACE("Files " + mFilename1 + " and " + mFilename2 + " differ.");
            }
        }

        ResetFiles();

        return (failures==0);
    }
};

#endif /*FILECOMPARISON_HPP_*/