DataFile.cpp

/* DataFile.cpp
Copyright (c) 2014 by Michael Zahniser

Endless Sky 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 3 of the License, or (at your option) any later version.

Endless Sky is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include "DataFile.h"

#include <QFile>
#include <QString>
#include <QTextStream>

using namespace std;



DataFile::DataFile()
{
}



DataFile::DataFile(const QString &path)
{
    Load(path);
}



void DataFile::Load(const QString &path)
{
    QFile file(path);
    if(!file.open(QFile::ReadOnly | QFile::Text))
        return;
    QTextStream in(&file);
    in.setCodec("UTF-8");

    vector<DataNode *> stack(1, &root);
    vector<int> whiteStack(1, -1);

    while(!in.atEnd())
    {
        QString line = in.readLine();
        int length = line.length();

        int white = 0;
        while(white < length && line[white].isSpace())
            ++white;

        // Skip comments and empty lines.
        if(white == length || line[white] == '#')
        {
            if(white != length)
            {
                comments += line;
                comments += '\n';
            }
            continue;
        }
        while(whiteStack.back() >= white)
        {
            whiteStack.pop_back();
            stack.pop_back();
        }

        list<DataNode> &children = stack.back()->children;
        children.push_back(DataNode());
        DataNode &node = children.back();

        stack.push_back(&node);
        whiteStack.push_back(white);

        // Tokenize the line.
        int i = white;
        while(i != length)
        {
            QChar endQuote = line[i];
            bool isQuoted = (endQuote == '"' || endQuote == '`');
            i += isQuoted;

            node.tokens.push_back(QString());
            while(i != length && (isQuoted ? (line[i] != endQuote) : (line[i] > ' ')))
                node.tokens.back() += line[i++];

            if(i != length)
            {
                i += isQuoted;
                while(i != length && line[i].isSpace())
                    ++i;
            }
        }
    }
}



list<DataNode>::const_iterator DataFile::begin() const
{
    return root.begin();
}



list<DataNode>::const_iterator DataFile::end() const
{
    return root.end();
}

// Get all the comments that were stripped out when reading.
const QString &DataFile::Comments() const
{
    return comments;
}