NumericFileComparison.hpp

/*

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 * Redistributions of source code must retain the above copyright notice,
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 * Redistributions in binary form must reproduce the above copyright notice,
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   software without specific prior written permission.

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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
{
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
        {
            if (!(*mpFile1>>data1))
            {
                // Cannot read the next token from file as a number, so try a word instead
                std::string word;
                mpFile1->clear(); // reset the "failbit"
                if (*mpFile1 >> word)
                {
                    data1 = A_WORD;
                    if (word == "#" || word == "!")
                    {
                        // Ignore comment (up to 1024 characters until newline)
                        mpFile1->ignore(1024, '\n');
                    }
                }
                else
                {
                    mpFile1->clear(); // reset the "failbit"
                    data1 = NOTHING_TO_READ;
                }
            }
            if (!(*mpFile2 >> data2))
            {
                // Cannot read the next token from file as a number, so try a word instead
                std::string word;
                mpFile2->clear(); // reset the "failbit"
                if (*mpFile2 >> word)
                {
                    data2 = A_WORD;
                    if (word == "#" || word == "!")
                    {
                        // Ignore comment (up to 1024 characters until newline)
                        mpFile2->ignore(1024, '\n');
                    }
                }
                else
                {
                    mpFile2->clear(); // reset the "failbit"
                    data2 = NOTHING_TO_READ;
                }
            }

            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_*/