annotate data/fileio/CSVFormat.cpp @ 631:3a5ee4b6c9ad

* Complete the overhaul of CSV file import; now you can pick the purpose for
  each column in the file, and SV should do the rest.  The most significant
  practical improvement here is that we can now handle files in which time
  and duration do not necessarily appear in known columns.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "CSVFormat.h"

#include "base/StringBits.h"

#include <QFile>
#include <QString>
#include <QRegExp>
#include <QStringList>
#include <QTextStream>

#include <iostream>

CSVFormat::CSVFormat(QString path) :
    m_separator(""),
    m_sampleRate(44100),
    m_windowSize(1024),
    m_allowQuoting(true)
{
    guessFormatFor(path);
}

void
CSVFormat::guessFormatFor(QString path)
{
    m_modelType = TwoDimensionalModel;
    m_timingType = ExplicitTiming;
    m_timeUnits = TimeSeconds;

    m_maxExampleCols = 0;
    m_columnCount = 0;
    m_variableColumnCount = false;

    m_example.clear();
    m_columnQualities.clear();
    m_columnPurposes.clear();
    m_prevValues.clear();

    QFile file(path);
    if (!file.exists()) return;
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) return;

    QTextStream in(&file);
    in.seek(0);

    int lineno = 0;

    while (!in.atEnd()) {

        // See comment about line endings in CSVFileReader::load() 

        QString chunk = in.readLine();
        QStringList lines = chunk.split('\r', QString::SkipEmptyParts);

        for (size_t li = 0; li < lines.size(); ++li) {

            QString line = lines[li];
            if (line.startsWith("#") || line == "") continue;

            guessQualities(line, lineno);

            if (++lineno == 50) break;
        }
    }

    guessPurposes();
}

void
CSVFormat::guessSeparator(QString line)
{
    char candidates[] = { ',', '\t', ' ', '|', '/', ':' };
    for (int i = 0; i < sizeof(candidates)/sizeof(candidates[0]); ++i) {
        if (StringBits::split(line, candidates[i], m_allowQuoting).size() >= 2) {
            m_separator = candidates[i];
            return;
        }
    }
    m_separator = " ";
}

void
CSVFormat::guessQualities(QString line, int lineno)
{
    if (m_separator == "") guessSeparator(line);

    QStringList list = StringBits::split(line, m_separator[0], m_allowQuoting);

    int cols = list.size();
    if (lineno == 0 || (cols < m_columnCount)) m_columnCount = cols;
    if (cols != m_columnCount) m_variableColumnCount = true;

    // All columns are regarded as having these qualities until we see
    // something that indicates otherwise:

    ColumnQualities defaultQualities =
        ColumnNumeric | ColumnIntegral | ColumnIncreasing;
    
    for (int i = 0; i < cols; ++i) {
	    
        while (m_columnQualities.size() <= i) {
            m_columnQualities.push_back(defaultQualities);
            m_prevValues.push_back(0.f);
        }

        QString s(list[i]);
        bool ok = false;

        ColumnQualities qualities = m_columnQualities[i];

        bool numeric    = (qualities & ColumnNumeric);
        bool integral   = (qualities & ColumnIntegral);
        bool increasing = (qualities & ColumnIncreasing);
        bool large      = (qualities & ColumnLarge); // this one defaults to off

        float value = 0.f;

        //!!! how to take into account headers?

        if (numeric) {
            value = s.toFloat(&ok);
            if (!ok) {
                value = (float)StringBits::stringToDoubleLocaleFree(s, &ok);
            }
            if (ok) {
                if (lineno < 2 && value > 1000.f) large = true;
            } else {
                numeric = false;
            }
        }

        if (numeric) {

            if (integral) {
                if (s.contains('.') || s.contains(',')) {
                    integral = false;
                }
            }

            if (increasing) {
                if (lineno > 0 && value <= m_prevValues[i]) {
                    increasing = false;
                }
            }

            m_prevValues[i] = value;
        }

        m_columnQualities[i] =
            (numeric    ? ColumnNumeric : 0) |
            (integral   ? ColumnIntegral : 0) |
            (increasing ? ColumnIncreasing : 0) |
            (large      ? ColumnLarge : 0);
    }

    if (lineno < 10) {
        m_example.push_back(list);
        if (lineno == 0 || cols > m_maxExampleCols) {
            m_maxExampleCols = cols;
        }
    }

    std::cerr << "Estimated column qualities: ";
    for (int i = 0; i < m_columnCount; ++i) {
        std::cerr << int(m_columnQualities[i]) << " ";
    }
    std::cerr << std::endl;
}

void
CSVFormat::guessPurposes()
{
    m_timingType = CSVFormat::ImplicitTiming;
    m_timeUnits = CSVFormat::TimeWindows;
	
    int timingColumnCount = 0;
    
    for (int i = 0; i < m_columnCount; ++i) {
        
        ColumnPurpose purpose = ColumnUnknown;
        bool primary = (i == 0);

        ColumnQualities qualities = m_columnQualities[i];

        bool numeric    = (qualities & ColumnNumeric);
        bool integral   = (qualities & ColumnIntegral);
        bool increasing = (qualities & ColumnIncreasing);
        bool large      = (qualities & ColumnLarge);

        bool timingColumn = (numeric && increasing);

        if (timingColumn) {

            ++timingColumnCount;
                              
            if (primary) {

                purpose = ColumnStartTime;

                m_timingType = ExplicitTiming;

                if (integral && large) {
                    m_timeUnits = TimeAudioFrames;
                } else {
                    m_timeUnits = TimeSeconds;
                }

            } else {

                if (timingColumnCount == 2 && m_timingType == ExplicitTiming) {
                    purpose = ColumnEndTime;
                }
            }
        }

        if (purpose == ColumnUnknown) {
            if (numeric) {
                purpose = ColumnValue;
            } else {
                purpose = ColumnLabel;
            }
        }

        setColumnPurpose(i, purpose);
    }            

    int valueCount = 0;
    for (int i = 0; i < m_columnCount; ++i) {
        if (m_columnPurposes[i] == ColumnValue) ++valueCount;
    }

    if (valueCount == 2 && timingColumnCount == 1) {
        // If we have exactly two apparent value columns and only one
        // timing column, but one value column is integral and the
        // other is not, guess that whichever one matches the integral
        // status of the time column is either duration or end time
        if (m_timingType == ExplicitTiming) {
            int a = -1, b = -1;
            for (int i = 0; i < m_columnCount; ++i) {
                if (m_columnPurposes[i] == ColumnValue) {
                    if (a == -1) a = i;
                    else b = i;
                }
            }
            if ((m_columnQualities[a] & ColumnIntegral) !=
                (m_columnQualities[b] & ColumnIntegral)) {
                int timecol = a;
                if ((m_columnQualities[a] & ColumnIntegral) !=
                    (m_columnQualities[0] & ColumnIntegral)) {
                    timecol = b;
                }
                if (m_columnQualities[timecol] & ColumnIncreasing) {
                    // This shouldn't happen; should have been settled above
                    m_columnPurposes[timecol] = ColumnEndTime;
                } else {
                    m_columnPurposes[timecol] = ColumnDuration;
                }
                --valueCount;
            }
        }
    }

    if (timingColumnCount > 1) {
        m_modelType = TwoDimensionalModelWithDuration;
    } else {
        if (valueCount == 0) {
            m_modelType = OneDimensionalModel;
        } else if (valueCount == 1) {
            m_modelType = TwoDimensionalModel;
        } else {
            m_modelType = ThreeDimensionalModel;
        }
    }

    std::cerr << "Estimated column purposes: ";
    for (int i = 0; i < m_columnCount; ++i) {
        std::cerr << int(m_columnPurposes[i]) << " ";
    }
    std::cerr << std::endl;

    std::cerr << "Estimated model type: " << m_modelType << std::endl;
    std::cerr << "Estimated timing type: " << m_timingType << std::endl;
    std::cerr << "Estimated units: " << m_timeUnits << std::endl;
}

CSVFormat::ColumnPurpose
CSVFormat::getColumnPurpose(int i)
{
    while (m_columnPurposes.size() <= i) {
        m_columnPurposes.push_back(ColumnUnknown);
    }
    return m_columnPurposes[i];
}

CSVFormat::ColumnPurpose
CSVFormat::getColumnPurpose(int i) const
{
    return m_columnPurposes[i];
}

void
CSVFormat::setColumnPurpose(int i, ColumnPurpose p)
{
    while (m_columnPurposes.size() <= i) {
        m_columnPurposes.push_back(ColumnUnknown);
    }
    m_columnPurposes[i] = p;
}