annotate base/StringBits.cpp @ 1376:d9511f9e04d7 dev/refactor-piper-related

Introduce some POD structs for describing an external server application and the desired libraries to load from it, and disambiguating between empty list request and invalid list request. This allows for overriding PiperVampPluginFactory behaviour for using a PluginScan to populate the list request.

/* -*- 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"

#include "Debug.h"

using namespace std;

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;

    // sep -> just seen a field separator (or start of line)
    // unq -> in an unquoted field
    // q1  -> in a single-quoted field
    // q2  -> in a double-quoted field

    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 = unq; break;
	    }

	} else if (c == '"') {
	    switch (mode) {
	    case sep: mode = q2; break;
	    case unq: case q1: tok += c; break;
	    case q2: mode = unq; 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) {
        if (mode == q1) {
            tokens << ("'" + tok);  // turns out it wasn't quoted after all
        } else if (mode == q2) {
            tokens << ("\"" + tok);
        } else {
            tokens << tok;
        }
    }

    return tokens;
}

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);
    }
}