NumericFileComparison.hpp

/*

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*/
#ifndef NUMERICFILECOMPARISON_HPP_
#define NUMERICFILECOMPARISON_HPP_

#include <cfloat>

#include "AbstractFileComparison.hpp"
#include "MathsCustomFunctions.hpp"

#define A_WORD DBL_MAX
#define NOTHING_TO_READ DBL_MIN

class NumericFileComparison : public AbstractFileComparison
{
private:
    void ReadNextToken(std::ifstream* pFile, double& rData)
    {
        if (!(*pFile>>rData))
        {
            // Cannot read the next token from file as a number, so try a word instead
            std::string word;
            pFile->clear(); // reset the "failbit"
            if (*pFile >> word)
            {
                rData = A_WORD;
                if (word == "#" || word == "!")
                {
                    // Ignore comment (up to 1024 characters until newline)
                    pFile->ignore(1024, '\n');
                }
            }
            else
            {
                pFile->clear(); // reset the "failbit"
                rData = NOTHING_TO_READ;
            }
        }
    }

public:

    NumericFileComparison(std::string fileName1, std::string fileName2, bool calledCollectively=true, bool suppressOutput = false)
        : AbstractFileComparison(fileName1, fileName2, calledCollectively, suppressOutput)
    {
    }

    NumericFileComparison(const FileFinder& rFileName1, const FileFinder& rFileName2, bool calledCollectively=true, bool suppressOutput = false)
        : AbstractFileComparison(rFileName1, rFileName2, calledCollectively, suppressOutput)
    {
    }


    bool CompareFiles(double absTol=DBL_EPSILON, unsigned ignoreFirstFewLines=0,
                      double relTol=DBL_EPSILON, 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;
        }

        double data1;
        double data2;
        unsigned failures = 0;
        unsigned max_display_failures = 10;

        SkipHeaderLines(ignoreFirstFewLines);

        do
        {
            ReadNextToken(mpFile1, data1);
            ReadNextToken(mpFile2, data2);
            bool ok = CompareDoubles::WithinAnyTolerance(data1, data2, relTol, absTol);
            if (!ok)
            {
                if (failures++ < max_display_failures && !mSuppressOutput)
                {
                    // Display error
                    CompareDoubles::WithinAnyTolerance(data1, data2, relTol, absTol, true);
                }
            }
        }
        while (data1 != NOTHING_TO_READ && data2 != NOTHING_TO_READ); // If either is a NOTHING_TO_READ, then it means that there's nothing to read from the file

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

        ResetFiles();

        return (failures==0);
    }
};

#endif /*NUMERICFILECOMPARISON_HPP_*/