annotate base/StringBits.cpp @ 979:c598b1d880f2

Fix potential null pointer deref

/* -*- 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;
                case unq: case q1: case q2: tok += c; break;
		}
	    }

	} else {
	    switch (mode) {
	    case sep: mode = unq; tok += c; break;
            case unq: case q1: case q2: 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] << endl;
	cout << "->" << endl << "(";
	QStringList l = splitQuoted(tests[j], ' ');
	for (int i = 0; i < l.size(); ++i) {
	    if (i > 0) cout << ";";
	    cout << l[i];
	}
	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);
    }
}