/*
-------------------------------------------------------------------------
 CxxTest: A lightweight C++ unit testing library.
 Copyright (c) 2008 Sandia Corporation.
 This software is distributed under the LGPL License v2.1
 For more information, see the COPYING file in the top CxxTest directory.
 Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
 the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------
*/

#ifndef __cxxtest__ValueTraits_cpp__
#define __cxxtest__ValueTraits_cpp__

#include <cxxtest/ValueTraits.h>

namespace CxxTest 
{
    //
    // Non-inline functions from ValueTraits.h
    //
    
    char digitToChar( unsigned digit )
    {
        if ( digit < 10 )
            return (char)('0' + digit);
        if ( digit <= 10 + 'Z' - 'A' )
            return (char)('A' + digit - 10);
        return '?';
    }

    const char *byteToHex( unsigned char byte )
    {
        static char asHex[3];
        asHex[0] = digitToChar( byte >> 4 );
        asHex[1] = digitToChar( byte & 0x0F );
        asHex[2] = '\0';
        return asHex;
    }
    
    char *copyString( char *dst, const char *src )
    {
        while ( (*dst = *src) != '\0' ) {
            ++ dst;
            ++ src;
        }
        return dst;
    }

    bool stringsEqual( const char *s1, const char *s2 )
    {
        char c;
        while ( (c = *s1++) == *s2++ )
            if ( c == '\0' )
                return true;
        return false;
    }

    char *charToString( unsigned long c, char *s )
    {
        switch( c ) {
        case '\\': return copyString( s, "\\\\" );
        case '\"': return copyString( s, "\\\"" );
        case '\'': return copyString( s, "\\\'" );
        case '\0': return copyString( s, "\\0" );
        case '\a': return copyString( s, "\\a" );
        case '\b': return copyString( s, "\\b" );
        case '\n': return copyString( s, "\\n" );
        case '\r': return copyString( s, "\\r" );
        case '\t': return copyString( s, "\\t" );
        }
        if ( c >= 32 && c <= 127 ) {
            s[0] = (char)c;
            s[1] = '\0';
            return s + 1;
        }
        else {
            s[0] = '\\';
            s[1] = 'x';
            if ( c < 0x10 ) {
                s[2] = '0';
                ++ s;
            }
            return numberToString( c, s + 2, 16UL );
        }
    }

    char *charToString( char c, char *s )
    {
        return charToString( (unsigned long)(unsigned char)c, s );
    }
    
    char *bytesToString( const unsigned char *bytes, unsigned numBytes, unsigned maxBytes, char *s )
    {
        bool truncate = (numBytes > maxBytes);
        if ( truncate )
            numBytes = maxBytes;
        
        s = copyString( s, "{ " );
        for ( unsigned i = 0; i < numBytes; ++ i, ++ bytes )
            s = copyString( copyString( s, byteToHex( *bytes ) ), " " );
        if ( truncate )
            s = copyString( s, "..." );
        return copyString( s, " }" );
    }

#ifndef CXXTEST_USER_VALUE_TRAITS
    unsigned ValueTraits<const double>::requiredDigitsOnLeft( double t )
    {
        unsigned digits = 1;
        for ( t = (t < 0.0) ? -t : t; t > 1.0; t /= BASE )
            ++ digits;
        return digits;
    }

    char *ValueTraits<const double>::doNegative( double &t )
    {
        if ( t >= 0 )
            return _asString;
        _asString[0] = '-';
        t = -t;
        return _asString + 1;
    }

    void ValueTraits<const double>::hugeNumber( double t )
    {
        char *s = doNegative( t );
        s = doubleToString( t, s, 0, 1 );
        s = copyString( s, "." );
        s = doubleToString( t, s, 1, DIGITS_ON_RIGHT );
        s = copyString( s, "E" );
        s = numberToString( requiredDigitsOnLeft( t ) - 1, s );
    }
        
    void ValueTraits<const double>::normalNumber( double t )
    {
        char *s = doNegative( t );
        s = doubleToString( t, s );
        s = copyString( s, "." );
        for ( unsigned i = 0; i < DIGITS_ON_RIGHT; ++ i )
            s = numberToString( (unsigned)(t *= BASE) % BASE, s );
    }

    void ValueTraits<const double>::nonFiniteNumber( double t )
    {
        char *s = _asString;
        if ( t != t )
            s = copyString( s, "nan" );
        //else if ( t == 1.0/0.0 )
        else if ( t >= HUGE_VAL )
            s = copyString( s, "-inf" );
        else if ( t <= -HUGE_VAL )
        //else if ( t == -1.0/0.0 )
            s = copyString( s, "inf" );
    }

    char *ValueTraits<const double>::doubleToString( double t, char *s, unsigned skip, unsigned max )
    {
        return numberToString<double>( t, s, BASE, skip, max );
    }
#endif // !CXXTEST_USER_VALUE_TRAITS
}

#endif // __cxxtest__ValueTraits_cpp__
