renamed libpg to libbear

[physics.git] / src / config / reader.cpp

/*
 *  Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com.
 *
 *  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 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "reader.h"

#include <bear/debug.h>
using namespace bear;

#include <iostream>
using std::cerr;
using std::cout;
using std::endl;

#include <fstream>
#include <string>

#include "keys.h"

using std::ifstream;
using std::string;

typedef std::map<string, SDLKey> kMap;
kMap keyMap;

/// ***** Private Method Headers *****

void processLine(const string& str);
bool extractLine(const string& str, string* name, string* value);
void createKeyMap();

/// ***** Private Variables *****

const char* configDir = "configs/";
const char* testFile = "keys.cfg";

/// ***** Public Methods *****

void readConfigs()
{
    char fileName[64];

    createKeyMap();

    strcpy(fileName, configDir);
    strcat(fileName, testFile);

    ifstream file(fileName);

    if( !file.is_open() )
    {
        cerr << "Unable to open file " << fileName << "." << endl;
        exit(1);
    }

    while(true)
    {
        string line;
        getline(file, line);

        if(file.eof())
            break;

        processLine(line);
    }

    file.close();
}

/// ***** Private Methods *****

void processLine(const string& str)
{
    string name;
    string value;

    bool extracted;

    extracted = extractLine(str, &name, &value);

    if(extracted)
    {
        SDLKey key = keyMap[value];

        if(0 != key)
        {
            *(key::sdlMap[name]) = key;
        }
    }
}

/*
 * Return true iff the string str, had a name and value extracted and saved in
 * name and value. Otherwise return false and leave name and value alone.
 */
bool extractLine(const string& str, string* name, string* value)
{
    /*
     * state    := 0 if eating leading name whitespace
     *          := 1 if saving name
     *          := 2 if eating trailing name whitespace
     *          := 3 if eating leading value whitespace
     *          := 4 if saving value
     *          := 5 if all is done and well
     */
    int state = 0;

    int char_pos = 0;

    int name_start = 0;
    int name_end = 0;

    int value_start = 0;
    int value_end = 0;

    const char* c_str = str.c_str();

    while(true)
    {
        if(c_str[char_pos] == 0 && state != 4)
            return false;

        switch (state)
        {
            case 0:
                if(c_str[char_pos] != ' '
                && c_str[char_pos] != '\t')
                {
                    state++;
                    name_start = char_pos;
                }
                break;
            case 1:
                if(c_str[char_pos] == ' '
                || c_str[char_pos] == '\t'
                || c_str[char_pos] == '=')
                {
                    state++;
                    name_end = char_pos;
                }

                if(c_str[char_pos] == '=')
                    char_pos--; // decrement to stay on this char
                break;
            case 2:
                if(c_str[char_pos] != ' '
                && c_str[char_pos] != '\t'
                && c_str[char_pos] != '=')
                {
                    return false;
                }

                if(c_str[char_pos] == '=')
                {
                    state++;
                }
                break;
            case 3:
                if(c_str[char_pos] != ' '
                && c_str[char_pos] != '\t')
                {
                    state++;
                    value_start = char_pos;
                }
                break;
            case 4:
                if(c_str[char_pos] == ' '
                || c_str[char_pos] == '\t'
                || c_str[char_pos] == 0)
                {
                    state++;
                    value_end = char_pos;
                }
                break;
        }

        if(state == 5)
            break;

        char_pos++;
    }

    name->clear();
    value->clear();

    name->replace   (0, 0, c_str, name_start,   name_end  - name_start);
    value->replace  (0, 0, c_str, value_start,  value_end - value_start);

    return true;
}

void createKeyMap()
{
    char buf[2] = {0,0};

    // add all the letters
    for (int i = 'A'; i <= 'Z'; i++)   // uppercase
    {
        buf[0] = (char)i;
        keyMap[buf] = (SDLKey)(i + 'a' - 'A');
    }
    for (int i = 'a'; i <= 'z'; i++)   // lowercase
    {
        buf[0] = (char)i;
        keyMap[buf] = (SDLKey)i;
    }

    // add all the numbers
    for (int i = '0'; i <= '9'; i++)
    {
        buf[0] = (char)i;
        keyMap[buf] = (SDLKey)i;
    }

    /*
    // add the function keys
    int F1 = (int)Key.F1;
    for (int i = F1; i <= (int)Key.F15; i++)
    {
        keyMap.Add("F" + (i - F1 + 1), (Key)i);
        keyMap.Add("f" + (i - F1 + 1), (Key)i);
    }
    */

    keyMap["LCtrl"]         = SDLK_LCTRL;
    keyMap["LeftControl"]   = SDLK_LCTRL;
    keyMap["LAlt"]          = SDLK_LALT;
    keyMap["LeftAlt"]       = SDLK_LALT;
    keyMap["LShift"]        = SDLK_LSHIFT;
    keyMap["LeftShift"]     = SDLK_LSHIFT;
    keyMap["LWin"]          = SDLK_LSUPER;
    keyMap["LeftWindows"]   = SDLK_LSUPER;
    keyMap["LeftMeta"]      = SDLK_LMETA;
    keyMap["LMeta"]         = SDLK_LMETA;

    keyMap["RCtrl"]         = SDLK_RCTRL;
    keyMap["RightControl"]  = SDLK_RCTRL;
    keyMap["RAlt"]          = SDLK_RALT;
    keyMap["RightAlt"]      = SDLK_RALT;
    keyMap["RShift"]        = SDLK_RSHIFT;
    keyMap["RightShift"]    = SDLK_RSHIFT;
    keyMap["RWin"]          = SDLK_RSUPER;
    keyMap["RightWindows"]  = SDLK_RSUPER;
    keyMap["RightMeta"]     = SDLK_RMETA;
    keyMap["RMeta"]         = SDLK_RMETA;

    keyMap["Esc"]           = SDLK_ESCAPE;
    keyMap["Escape"]        = SDLK_ESCAPE;

    keyMap["Return"]        = SDLK_RETURN;
    keyMap["Enter"]         = SDLK_RETURN;

    keyMap["Insert"]        = SDLK_INSERT;
    keyMap["Home"]          = SDLK_HOME;
    keyMap["Delete"]        = SDLK_DELETE;
    keyMap["End"]           = SDLK_END;
    keyMap["PageUp"]        = SDLK_PAGEUP;
    keyMap["PageDown"]      = SDLK_PAGEDOWN;

    keyMap["Minus"]         = SDLK_MINUS;
    keyMap["Equal"]         = SDLK_EQUALS;
    keyMap["Equals"]        = SDLK_EQUALS;
    keyMap["LeftBracket"]   = SDLK_LEFTBRACKET;
    keyMap["LBracket"]      = SDLK_LEFTBRACKET;
    keyMap["RightBracket"]  = SDLK_RIGHTBRACKET;
    keyMap["RBracket"]      = SDLK_RIGHTBRACKET;
    keyMap["Backslash"]     = SDLK_BACKSLASH;
    keyMap["Slash"]         = SDLK_SLASH;
    keyMap["Semicolon"]     = SDLK_SEMICOLON;
    keyMap["Semi"]          = SDLK_SEMICOLON;
    keyMap["Quote"]         = SDLK_QUOTE;
    keyMap["Comma"]         = SDLK_COMMA;
    keyMap["Period"]        = SDLK_PERIOD;
    keyMap["Space"]         = SDLK_SPACE;
    keyMap["BSpace"]        = SDLK_BACKSPACE;
    keyMap["Backspace"]     = SDLK_BACKSPACE;
    keyMap["BackSpace"]     = SDLK_BACKSPACE;

    keyMap["Tab"]           = SDLK_TAB;
    keyMap["BackQuote"]     = SDLK_BACKQUOTE;
    keyMap["BQuote"]        = SDLK_BACKQUOTE;
    keyMap["CapsLock"]      = SDLK_CAPSLOCK;
    keyMap["Caps"]          = SDLK_CAPSLOCK;

    keyMap["Up"]            = SDLK_UP;
    keyMap["Down"]          = SDLK_DOWN;
    keyMap["Left"]          = SDLK_LEFT;
    keyMap["Right"]         = SDLK_RIGHT;
}