/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004, 2019 KiCad Developers, see change_log.txt for contributors.
 *
 * 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.
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

/**
 * @file  kicad_string.h
 * @see   common.h, string.cpp
 */


#ifndef KICAD_STRING_H_
#define KICAD_STRING_H_

#include "config.h"

#include <wx/string.h>
#include <wx/filename.h>


/**
 * Escape/Unescape routines to safely encode reserved-characters in various
 * contexts.
 */
enum ESCAPE_CONTEXT
{
    CTX_NETNAME,
    CTX_LIBID,
    CTX_QUOTED_STR,
    CTX_DELIMITED_STR,
    CTX_FILENAME
};

wxString EscapeString( const wxString& aSource, ESCAPE_CONTEXT aContext );

wxString UnescapeString( const wxString& aSource );

/**
 * Copy bytes from @a aSource delimited string segment to @a aDest buffer.
 *
 * The extracted string will be null terminated even if truncation is necessary
 * because aDestSize was not large enough.
 *
 * @param aDest is the destination byte buffer.
 * @param aSource is the source bytes as a C string.
 * @param aDestSize is the size of the destination byte buffer.
 * @return int - the number of bytes read from source, which may be more than
 *   the number copied, due to escaping of double quotes and the escape byte itself.
 * @deprecated should use the one which fetches a wxString, below.
 */
int ReadDelimitedText( char* aDest, const char* aSource, int aDestSize );

/**
 * Copy bytes from @a aSource delimited string segment to @a aDest wxString.
 *
 * @param aDest is the destination wxString
 * @param aSource is the source C string holding utf8 encoded bytes.
 * @return int - the number of bytes read from source, which may be more than
 *   the number copied, due to escaping of double quotes and the escape byte itself.
 */
int ReadDelimitedText( wxString* aDest, const char* aSource );

/**
 * Function EscapedUTF8
 * returns an 8 bit UTF8 string given aString in unicode form.
 * Any double quoted or back slashes are prefixed with a '\\' byte and the form
 * of this UTF8 byte string is compatible with function ReadDelimitedText().
 *
 * @param aString is the input string to convert.
 * @return std::string - the escaped input text, without the wrapping double quotes.
 */
std::string EscapedUTF8( wxString aString );

/**
 * Return a new wxString escaped for embedding in HTML.
 */
wxString EscapedHTML( const wxString& aString );

/**
 * Read one line line from \a aFile.
 *
 * @return a pointer the first useful line read by eliminating blank lines and comments.
 */
char* GetLine( FILE* aFile, char* Line, int* LineNum = NULL, int SizeLine = 255 );

/**
 * Remove leading and training spaces, tabs and end of line chars in \a text
 *
 * @return a pointer on the first n char in text
 */
char* StrPurge( char* text );

/**
 * @return a string giving the current date and time.
 */
wxString DateAndTime();

/**
 * Compare two strings with alphanumerical content.
 *
 * This function is equivalent to strncmp() or strncasecmp() if \a aIgnoreCase is true
 * except that strings containing numbers are compared by their integer value not
 * by their ASCII code.  In other words U10 would be greater than U2.
 *
 * @param aString1 A wxString reference to the reference string.
 * @param aString2 A wxString reference to the comparison string.
 * @param aIgnoreCase Use true to make the comparison case insensitive.
 * @return An integer value of -1 if \a aString1 is less than \a aString2, 0 if
 *         \a aString1 is equal to \a aString2, or 1 if \a aString1 is greater
 *         than \a aString2.
 */
int StrNumCmp( const wxString& aString1, const wxString& aString2, bool aIgnoreCase = false );

/**
 * Compare a string against wild card (* and ?) pattern using the usual rules.
 *
 * @return true if pattern matched otherwise false.
 */
bool WildCompareString( const wxString& pattern,
                        const wxString& string_to_tst,
                        bool            case_sensitive = true );

/**
 * Compare strings like the strcmp function but handle numbers and modifiers within the
 * string text correctly for sorting.  eg. 1mF > 55uF
 *
 * @return -1 if first string is less than the second, 0 if the strings are equal, or
 *          1 if the first string is greater than the second.
 */
int ValueStringCompare( wxString strFWord, wxString strSWord );

/**
 * Breaks a string into three parts: he alphabetic preamble, the numeric part, and any
 * alphabetic ending.
 *
 * For example C10A is split to C 10 A
 */
int SplitString( wxString  strToSplit,
                 wxString* strBeginning,
                 wxString* strDigits,
                 wxString* strEnd );

/**
 * Gets the trailing int, if any, from a string.
 *
 * @param  aStr the string to check
 * @return      the trailing int or 0 if none found
 */
int GetTrailingInt( const wxString& aStr );

/**
 * @return a wxString object containing the illegal file name characters for all platforms.
 */
wxString GetIllegalFileNameWxChars();

/**
 * Checks \a aName for illegal file name characters.
 *
 * The Windows (DOS) file system forbidden characters already include the forbidden file
 * name characters for both Posix and OSX systems.  The characters \/?*|"\<\> are illegal
 * and are replaced with %xx where xx the hexadecimal equivalent of the replaced character.
 * This replacement may not be as elegant as using an underscore ('_') or hyphen ('-') but
 * it guarantees that there will be no naming conflicts when fixing footprint library names.
 * however, if aReplaceChar is given, it will replace the illegal chars
 *
 * @param aName is a point to a std::string object containing the footprint name to verify.
 * @param aReplaceChar (if not 0) is the replacement char.
 * @return true if any characters have been replaced in \a aName.
 */
bool ReplaceIllegalFileNameChars( std::string* aName, int aReplaceChar = 0 );
bool ReplaceIllegalFileNameChars( wxString& aName, int aReplaceChar = 0 );

#ifndef HAVE_STRTOKR
// common/strtok_r.c optionally:
extern "C" char* strtok_r( char* str, const char* delim, char** nextp );
#endif

/**
 * A helper for sorting strings from the rear.  Useful for things like 3d model names
 * where they tend to be largely repetitious at the front.
 */
struct rsort_wxString
{
    bool operator() (const wxString& strA, const wxString& strB ) const
    {
        wxString::const_reverse_iterator sA = strA.rbegin();
        wxString::const_reverse_iterator eA = strA.rend();

        wxString::const_reverse_iterator sB = strB.rbegin();
        wxString::const_reverse_iterator eB = strB.rend();

        if( strA.empty() )
        {
            if( strB.empty() )
                return false;

            // note: this rule implies that a null string is first in the sort order
            return true;
        }

        if( strB.empty() )
            return false;

        while( sA != eA && sB != eB )
        {
            if( (*sA) == (*sB) )
            {
                ++sA;
                ++sB;
                continue;
            }

            if( (*sA) < (*sB) )
                return true;
            else
                return false;
        }

        if( sB == eB )
            return false;

        return true;
    }
};

#endif  // KICAD_STRING_H_
