view base/StringBits.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 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.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2010 Chris Cannam.
*/

#include "StringBits.h"

double
StringBits::stringToDoubleLocaleFree(QString s, bool *ok)
{
    int dp = 0;
    int sign = 1;
    int i = 0;
    double result = 0.0;
    int len = s.length();

    result = 0.0;

    if (ok) *ok = true;

    while (i < len && s[i].isSpace()) ++i;
    if (i < len && s[i] == '-') sign = -1;

    while (i < len) {

	QChar c = s[i];

        if (c.isDigit()) {

            double d = c.digitValue();

            if (dp > 0) {
                for (int p = dp; p > 0; --p) d /= 10.0;
                ++dp;
            } else {
                result *= 10.0;
            }

            result += d;

        } else if (c == '.') {

            dp = 1;

        } else if (ok) {
            *ok = false;
        }

        ++i;
    }

    return result * sign;
}
    
QStringList
StringBits::splitQuoted(QString s, QChar separator)
{
    QStringList tokens;
    QString tok;

    enum { sep, unq, q1, q2 } mode = sep;

    for (int i = 0; i < s.length(); ++i) {
	
	QChar c = s[i];

	if (c == '\'') {
	    switch (mode) {
	    case sep: mode = q1; break;
	    case unq: case q2: tok += c; break;
	    case q1: mode = sep; tokens << tok; tok = ""; break;
	    }

	} else if (c == '"') {
	    switch (mode) {
	    case sep: mode = q2; break;
	    case unq: case q1: tok += c; break;
	    case q2: mode = sep; tokens << tok; tok = ""; break;
	    }

	} else if (c == separator || (separator == ' ' && c.isSpace())) {
	    switch (mode) {
	    case sep: if (separator != ' ') tokens << ""; break;
	    case unq: mode = sep; tokens << tok; tok = ""; break;
	    case q1: case q2: tok += c; break;
	    }

	} else if (c == '\\') {
	    if (++i < s.length()) {
		c = s[i];
		switch (mode) {
		case sep: mode = unq; tok += c; break;
		default: tok += c; break;
		}
	    }

	} else {
	    switch (mode) {
	    case sep: mode = unq; tok += c; break;
	    default: tok += c; break;
	    }
	}
    }

    if (tok != "" || mode != sep) tokens << tok;
    return tokens;
}

/*

void testSplit()
{
    QStringList tests;
    tests << "a b c d";
    tests << "a \"b c\" d";
    tests << "a 'b c' d";
    tests << "a \"b c\\\" d\"";
    tests << "a 'b c\\' d'";
    tests << "a \"b c' d\"";
    tests << "a 'b c\" d'";
    tests << "aa 'bb cc\" dd'";
    tests << "a'a 'bb' \\\"cc\" dd\\\"";
    tests << "  a'a \\\'	 'bb'	 \'	\\\"cc\" ' dd\\\" '";

    for (int j = 0; j < tests.size(); ++j) {
	cout << endl;
	cout << tests[j].toStdString() << endl;
	cout << "->" << endl << "(";
	QStringList l = splitQuoted(tests[j], ' ');
	for (int i = 0; i < l.size(); ++i) {
	    if (i > 0) cout << ";";
	    cout << l[i].toStdString();
	}
	cout << ")" << endl;
    }
}

*/

/* 
   Results:

a b c d
->     
(a;b;c;d)

a "b c" d
->       
(a;b c;d)

a 'b c' d
->       
(a;b c;d)

a "b c\" d"
->         
(a;b c" d) 

a 'b c\' d'
->         
(a;b c' d) 

a "b c' d"
->        
(a;b c' d)

a 'b c" d'
->        
(a;b c" d)

aa 'bb cc" dd'
->            
(aa;bb cc" dd)

a'a 'bb' \"cc" dd\"
->                 
(a'a;bb;"cc";dd")  

  a'a \'         'bb'    '      \"cc" ' dd\" '
->                                            
(a'a;';bb;      "cc" ;dd";)

*/

QStringList
StringBits::split(QString line, QChar separator, bool quoted)
{
    if (quoted) {
        return splitQuoted(line, separator);
    } else {
        return line.split(separator,
                          separator == ' ' ? QString::SkipEmptyParts :
                          QString::KeepEmptyParts);
    }
}