/***************************************************************************
                               mnemo.cpp
                              -----------
    begin                : Sat Jun 11 2005
    copyright            : (C) 2005 by Michael Margraf
    email                : michael.margraf@alumni.tu-berlin.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "mnemo.h"
#include <QString>

#include <array>

typedef struct {
  const char *Mnemonic;
  unsigned short Unicode;
} tSpecialChar;

std::array<tSpecialChar, 59> SpecialChars{{
    {"alpha", 0x03B1},
    {"beta", 0x03B2},
    {"gamma", 0x03B3},
    {"delta", 0x03B4},
    {"epsilon", 0x03B5},
    {"zeta", 0x03B6},
    {"eta", 0x03B7},
    {"theta", 0x03B8},
    {"iota", 0x03B9},
    {"kappa", 0x03BA},
    {"lambda", 0x03BB},
    {"mu", 0x03BC},
    {"nu", 0x03BD},
    {"xi", 0x03BE},
    {"pi", 0x03C0},
    {"rho", 0x03C1},
    {"sigma", 0x03C3},
    {"tau", 0x03C4},
    {"upsilon", 0x03C5},
    {"phi", 0x03C6},
    {"chi", 0x03C7},
    {"psi", 0x03C8},
    {"omega", 0x03C9},
    {"varpi", 0x03D6},
    {"varrho", 0x03F1},
    {"Gamma", 0x0393},
    {"Delta", 0x0394},
    {"Theta", 0x0398},
    {"Lambda", 0x039B},
    {"Xi", 0x039E},
    {"Pi", 0x03A0},
    {"Sigma", 0x03A3},
    {"Upsilon", 0x03A5},
    {"Phi", 0x03A6},
    {"Psi", 0x03A8},
    {"Omega", 0x03A9},
    {"textmu", 0x00B5},
    {"cdot", 0x00B7},
    {"times", 0x00D7},
    {"pm", 0x00B1},
    {"mp", 0x2213},
    {"partial", 0x2202},
    {"nabla", 0x2207},
    {"infty", 0x221E},
    {"int", 0x222B},
    {"approx", 0x2248},
    {"neq", 0x2260},
    {"in", 0x220A},
    {"leq", 0x2264},
    {"geq", 0x2265},
    {"sim", 0x223C},
    {"propto", 0x221D},
    {"onehalf", 0x00BD},
    {"onequarter", 0x00BC},
    {"twosuperior", 0x00B2},
    {"threesuperior", 0x00B3},
    {"diameter", 0x00F8},
    {"ohm", 0x03A9},
    {"", 0} // end mark
}};

// This function replaces the LaTeX tags for special characters
// into its unicode value.
void encode_String(const QString &Input, QString &Output) {
  int Begin = 0, End = 0;

  Output = "";
  while ((Begin = Input.indexOf('\\', Begin)) >= 0) {
    Output += Input.mid(End, Begin - End);
    End = Begin++;

    for (const auto &sc : SpecialChars) { // test all special characters
      if (Input.mid(Begin).startsWith(sc.Mnemonic)) {
        Output += QChar(sc.Unicode);
        End = Begin + strlen(sc.Mnemonic);
        break;
      }
    }
  }
  Output += Input.mid(End);
}

// This function replaces the unicode of special characters
// by its LaTeX tags.
void decode_String(QString &Output) {
  for (const auto &sc : SpecialChars) {
    Output.replace(QChar(sc.Unicode), "\\" + QString(sc.Mnemonic));
  }
}