C++ AString::Append方法代码示例

// Concatenation
//------------------------------------------------------------------------------
void TestAString::Concatenation() const
{
    // Ensure empty strings are correctly handled
    // Because an empty AString is a special case pointer to a global empty
    // buffer, it's read-only
    {
        AString a, b;
        a += b;
    }
    {
        AString a;
        const char * b = "";
        a += b;
    }
    {
        AString a, b;
        a.Append( b );
    }
    {
        AString a;
        const char * b = "";
        a.Append( b, 0 );
    }
}

// ParseNamedVariableName
//------------------------------------------------------------------------------
/*static*/ bool BFFParser::ParseVariableName( BFFIterator & iter, AString & name, bool & parentScope )
{
	// skip over the declaration symbol
	ASSERT( *iter == BFF_DECLARE_VAR_INTERNAL ||
			*iter == BFF_DECLARE_VAR_PARENT );

	parentScope = ( *iter == BFF_DECLARE_VAR_PARENT );

	const BFFIterator varNameStart = iter; // include type token in var name
	iter++;

	// make sure we haven't hit the end of the file
	if ( iter.IsAtEnd() )
	{
		Error::Error_1012_UnexpectedEndOfFile( iter );
		return false;
	}

	if ( *iter == '\'' || *iter == '"' )
	{
		// parse the string
		const BFFIterator openToken = iter;
		iter.SkipString( *openToken );
		if ( *iter != *openToken )
		{
			Error::Error_1002_MatchingClosingTokenNotFound( openToken, nullptr, *openToken );
			return false;
		}
		BFFIterator stringStart = openToken;
		stringStart++;

		// unescape and subsitute embedded variables
		AStackString< 256 > value;
		if ( PerformVariableSubstitutions( stringStart, iter, value ) == false )
		{
			return false;
		}
		iter++; // skip close token

		BFFIterator varNameIter( value.Get(), value.GetLength(), iter.GetFileName().Get(), iter.GetFileTimeStamp() );

		// sanity check it is a sensible length
		if ( value.GetLength() + 1/* '.' will be added */  > MAX_VARIABLE_NAME_LENGTH )
		{
			Error::Error_1014_VariableNameIsTooLong( varNameIter, (uint32_t)value.GetLength(), (uint32_t)MAX_VARIABLE_NAME_LENGTH );
			return false;
		}

		// sanity check it is a valid variable name
		while ( varNameIter.IsAtEnd() == false )
		{
			if ( varNameIter.IsAtValidVariableNameCharacter() == false )
			{
				Error::Error_1013_UnexpectedCharInVariableName( varNameIter, nullptr );
				return false;
			}
			varNameIter++;
		}

		// append '.' to variable name
		name = ".";
		name.Append( value );
	}
	else
	{
		// make sure immediately after the symbol starts a variable name
		if ( iter.IsAtValidVariableNameCharacter() == false )
		{
			Error::Error_1013_UnexpectedCharInVariableName( iter, nullptr );
			return false;
		}

		// find the end of the variable name
		iter.SkipVariableName();
		const BFFIterator varNameEnd = iter;

		// sanity check it is a sensible length
		size_t varNameLen = varNameStart.GetDistTo( varNameEnd );
		if ( varNameLen > MAX_VARIABLE_NAME_LENGTH )
		{
			Error::Error_1014_VariableNameIsTooLong( iter, (uint32_t)varNameLen, (uint32_t)MAX_VARIABLE_NAME_LENGTH );
			return false;
		}

		// store variable name
		name.Assign( varNameStart.GetCurrent(), varNameEnd.GetCurrent() );
	}

	ASSERT( name.GetLength() > 0 );
	if ( parentScope )
	{
		// exchange '^' with '.'
		ASSERT( BFF_DECLARE_VAR_PARENT == name[0] );
		name[0] = BFF_DECLARE_VAR_INTERNAL;
	}

	return true;
}

// EmbeddedNuls
//------------------------------------------------------------------------------
void TestAString::EmbeddedNuls() const
{
    // Create a string with an embedded nul and check various behaviours
    AStackString<> string( "0123456789" );
    const uint32_t originalStringLen = string.GetLength();
    string[ 5 ] = 0; // insert null terminator

    // Copy construction
    {
        AString copy( string );
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );
    }

    // Assignment (operator =)
    {
        AString copy;
        copy = string;
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );
    }

    // Assignment (Assign)
    {
        AString copy;
        copy.Assign( string );
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );
    }

    // Assignment (Assign with iterators)
    {
        AString copy;
        copy.Assign( string.Get(), string.GetEnd() );
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );
    }

    // Append (operator +=)
    {
        // Append to empty
        AString copy;
        copy += string;
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( AString::StrNCmp( string.Get(), copy.Get(), originalStringLen ) == 0 );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );

        // Append to existing
        AString copy2( string );
        copy2 += string;
        TEST_ASSERT( copy2.GetLength() == ( originalStringLen * 2 ) );
        TEST_ASSERT( memcmp( "01234" "\0" "678901234" "\0" "6789", copy2.Get(), ( originalStringLen * 2 ) ) == 0 );
    }

    // Append (Append)
    {
        // Append to empty
        AString copy;
        copy.Append( string );
        TEST_ASSERT( copy.GetLength() == originalStringLen );
        TEST_ASSERT( memcmp( "01234" "\0" "6789", copy.Get(), originalStringLen ) == 0 );

        // Append to existing
        AString copy2( string );
        copy2.Append( string );
        TEST_ASSERT( copy2.GetLength() == ( originalStringLen * 2 ) );
        TEST_ASSERT( memcmp( "01234" "\0" "678901234" "\0" "6789", copy2.Get(), ( originalStringLen * 2 ) ) == 0 );
    }
}