C++ stringc::subString方法代码示例

//! returns the base part of a filename, i.e. all except for the directory
//! part. If no directory path is prefixed, the full name is returned.
core::stringc CFileSystem::getFileBasename(const core::stringc& filename, bool keepExtension) const
{
    // find last forward or backslash
    s32 lastSlash = filename.findLast('/');
    const s32 lastBackSlash = filename.findLast('\\');
    lastSlash = core::max_(lastSlash, lastBackSlash);

    // get number of chars after last dot
    s32 end = 0;
    if (!keepExtension)
    {
        // take care to search only after last slash to check only for
        // dots in the filename
        end = filename.findLast('.', lastSlash);
        if (end == -1)
            end=0;
        else
            end = filename.size()-end;
    }

    if ((u32)lastSlash < filename.size())
        return filename.subString(lastSlash+1, filename.size()-lastSlash-1-end);
    else if (end != 0)
        return filename.subString(0, filename.size()-end);
    else
        return filename;
}

bool FileSceneNode::isimg(core::stringc name) {
    if ((name.subString(name.size() - 4, 4).equals_ignore_case(".bmp")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".jpg")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".tga")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".pcx")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".png")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".psd")))
        return true;
    return false;
}

bool FileSceneNode::isanimesh(core::stringc name) {
    if ((name.subString(name.size() - 4, 4).equals_ignore_case(".md2")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".md3")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".obj")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".bsp")) ||
            (name.subString(name.size() - 5, 5).equals_ignore_case(".my3d")) ||
            (name.subString(name.size() - 5, 5).equals_ignore_case(".lmts")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".csm")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".oct")))
        return true;
    return false;
}

core::stringc CFileSystem::getAbsolutePath(const core::stringc& filename) const
{
	c8 *p=0;

#ifdef _IRR_WINDOWS_API_
	#if !defined ( _WIN32_WCE )
	c8 fpath[_MAX_PATH];
	p = _fullpath( fpath, filename.c_str(), _MAX_PATH);
	#endif

#elif (defined(_IRR_POSIX_API_) || defined(_IRR_OSX_PLATFORM_))
	c8 fpath[4096];
	fpath[0]=0;
	p = realpath(filename.c_str(), fpath);
	if (!p)
	{
		// content in fpath is undefined at this point
		if ('0'==fpath[0]) // seems like fpath wasn't altered
		{
			// at least remove a ./ prefix
			if ('.'==filename[0] && '/'==filename[1])
				return filename.subString(2, filename.size()-2);
			else
				return filename;
		}
		else
			return core::stringc(fpath);
	}

#endif

	return core::stringc(p);
}

core::stringc GetContextPathFromFilename( const core::stringc& filename )
{
    core::stringc path;
    s32 i=filename.size()-1;
    while ( i >= 0 && filename[i] != '/' )
    {
        i--;
    }
    path = filename.subString( 0, i+1 );
    return path;
}

core::stringc CMS3DMeshFileLoader::stripPathFromString(const core::stringc& inString, bool returnPath) const
{
	s32 slashIndex=inString.findLast('/'); // forward slash
	s32 backSlash=inString.findLast('\\'); // back slash

	if (backSlash>slashIndex) slashIndex=backSlash;

	if (slashIndex==-1)//no slashes found
	{
		if (returnPath)
			return core::stringc(); //no path to return
		else
			return inString;
	}

	if (returnPath)
		return inString.subString(0, slashIndex + 1);
	else
		return inString.subString(slashIndex+1, inString.size() - (slashIndex+1));
}

//! returns the directory part of a filename, i.e. all until the first
//! slash or backslash, excluding it. If no directory path is prefixed, a '.'
//! is returned.
core::stringc CFileSystem::getFileDir(const core::stringc& filename) const
{
	// find last forward or backslash
	s32 lastSlash = filename.findLast('/');
	const s32 lastBackSlash = filename.findLast('\\');
	lastSlash = lastSlash > lastBackSlash ? lastSlash : lastBackSlash;

	if ((u32)lastSlash < filename.size())
		return filename.subString(0, lastSlash);
	else
		return ".";
}

//! returns the base part of a filename, i.e. all except for the directory
//! part. If no directory path is prefixed, the full name is returned.
core::stringc CFileSystem::getFileBasename(const core::stringc& filename, bool keepExtension) const
{
	// find last forward or backslash
	s32 lastSlash = filename.findLast('/');
	const s32 lastBackSlash = filename.findLast('\\');
	lastSlash = core::max_(lastSlash, lastBackSlash);
	s32 end = 0;
	if (!keepExtension)
	{
		end = filename.findLast('.');
		if (end == -1)
			end=0;
		else
			end = filename.size()-end;
	}

	if ((u32)lastSlash < filename.size())
		return filename.subString(lastSlash+1, filename.size()-lastSlash-1-end);
	else if (end != 0)
		return filename.subString(0, filename.size()-end);
	else
		return filename;
}

bool FileSceneNode::isvid(core::stringc name) {
    if ((name.subString(name.size() - 4, 4).equals_ignore_case(".avi")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".wmv")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".mpg")) ||
            (name.subString(name.size() - 5, 5).equals_ignore_case(".mpeg")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".mp4")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".mkv")) ||
            (name.subString(name.size() - 4, 4).equals_ignore_case(".ogm")) ||
            (name.subString(name.size() - 3, 3).equals_ignore_case(".rm")) ||
            (name.subString(name.size() - 5, 5).equals_ignore_case(".divx")))
        return true;
    return false;
}

core::array<SDefineExp> grabDefineExpressions(core::stringc &shaderProgram)
{
	s32 CurrentSearchPos = 1;
	s32 FindHelper = 1;
	s32 FindHelper2 = 1;
	
	core::array<SDefineExp> DefineArray;

	// Dont bother stripping comments if theres no defines.
	if((CurrentSearchPos = shaderProgram.find("##ifdef")) == -1)
		return DefineArray;

	// Strip all comments, they get in the way.
	while((CurrentSearchPos = shaderProgram.find("//")) > -1)
	{
		FindHelper = shaderProgram.findNext('\n',CurrentSearchPos);
		if(FindHelper != -1)
			for(u32 i = CurrentSearchPos;i < (u32)FindHelper;++i)
				shaderProgram[i] = ' ';
		else
			for(u32 i = CurrentSearchPos;i < shaderProgram.size();++i)
				shaderProgram[i] = ' ';
	}

	while((CurrentSearchPos = shaderProgram.find("/*")) > -1)
	{
		FindHelper = shaderProgram.find("*/");
		if(FindHelper > CurrentSearchPos)
			for(u32 i = CurrentSearchPos;i <= (u32)(FindHelper + 1);++i)
				shaderProgram[i] = ' ';
		else
			for(u32 i = CurrentSearchPos;i < shaderProgram.size();++i)
				shaderProgram[i] = ' ';
	}

	while((CurrentSearchPos = shaderProgram.find("##ifdef")) > -1)
	{
		SDefineExp DExp;
		
		DExp.IfPos = CurrentSearchPos;
		
		// Comment out the ##ifdef so that we do not find it again, and so that the compiler ignores it.
		shaderProgram[CurrentSearchPos] = '/';
		shaderProgram[CurrentSearchPos + 1] = '/';

		FindHelper = shaderProgram.findNext(' ',CurrentSearchPos);
		FindHelper2 = shaderProgram.findNext('\n',FindHelper);

		if(FindHelper == -1 || FindHelper2 == -1)
		{
			std::cerr << "Shader preprocessor encountered invalid if statement." << std::endl;
			return DefineArray;
		}

		// Find the appropriate expression and trim all white space.
		DExp.IfExp = shaderProgram.subString(FindHelper,FindHelper2 - FindHelper);
		DExp.IfExp.trim();
		
		// Record if its inverse and remove ! sign from expression.
		if(DExp.IfExp[0] == '!')
		{
			DExp.IfExp[0] = ' ';
			DExp.IfExp.trim();
			DExp.Inverse = true;
		}

		bool EndIfFound = false;

		FindHelper2 = CurrentSearchPos;
		s32 IfEndScope = 0;

		while(!EndIfFound)
		{
			FindHelper = shaderProgram.findNext('#',FindHelper2);

			if(FindHelper == -1 || FindHelper >= (s32)(shaderProgram.size() - 3))
			{
				std::cerr << "Shader preprocessor encountered unmatched if statement." << std::endl;
				return DefineArray;
			}

			if(IfEndScope < 0)
			{
				std::cerr << "Shader preprocessor encountered unmatched endif statement." << std::endl;
				return DefineArray;
			}
			
			if(shaderProgram[FindHelper + 1] != '#')
			{
				FindHelper2 = FindHelper + 1;
				continue;
			}
			else if(shaderProgram[FindHelper + 2] == 'i')
			{
				IfEndScope++;
			}
			else if(shaderProgram[FindHelper + 2] == 'e' && shaderProgram[FindHelper + 3] == 'n')
			{
				if(IfEndScope == 0)
					break;
//.........这里部分代码省略.........

//! PreProcesses a shader using Irrlicht's built-in shader preprocessor.
core::stringc CShaderPreprocessor::ppShader(core::stringc shaderProgram)
{
	core::array<SDefineExp> DefineArray = grabDefineExpressions(shaderProgram);

	// No need for this as its already inited at startup.
	//// If DefineMap is empty then initialize it.
	//if(DefineMap.isEmpty())
	//	initDefineMap();

	for(u32 i = 0; i < DefineArray.size();++i)
	{
		if(DefineArray[i].IfPos == -1)
			break;
	
		// Either it is true and not inversed, or it is false, but inversed. 
		// (Wish C++ had a built-in (logical) XOR operator sometimes. :P) 
		if((DefineMap.find(DefineArray[i].IfExp) && !DefineArray[i].Inverse) 
		|| (!DefineMap.find(DefineArray[i].IfExp) && DefineArray[i].Inverse))
		{
			if(DefineArray[i].ElsePos > -1)
			{
				// If there is an else statement then clear the else section.
				if(DefineArray[i].EndPos != -1)
				{
					for(int z = DefineArray[i].ElsePos;z <= DefineArray[i].EndPos + 6;++z)
						shaderProgram[z] = ' ';
				}
			}
		}
		else if(DefineArray[i].ElsePos != -1)
		{
			// If there is an else statement then clear the if section.
			for(int z = DefineArray[i].IfPos;z <= DefineArray[i].ElsePos + 5;++z)
				shaderProgram[z] = ' ';
		}
		else
		{
			// Else just clear the whole block.
			if(DefineArray[i].EndPos != -1)
			{
				for(int z = DefineArray[i].IfPos;z <= DefineArray[i].EndPos + 6;++z)
					shaderProgram[z] = ' ';
			}
		}
	}

	core::map<core::stringc,core::stringc>::ParentFirstIterator DefIter;
	s32 DefFinder = 1;

	// Replace all shader defines.
	for(DefIter = DefineMap.getParentFirstIterator();!DefIter.atEnd();DefIter++)
	{
		if(DefIter->getValue().size() == 0)
			continue;

		// Replace all occurances.
		while((DefFinder = shaderProgram.find(DefIter->getKey().c_str())) > -1)
		{
			// Clear the define from the code.
			for(u32 z = DefFinder;z < DefFinder + DefIter->getKey().size();++z)
				shaderProgram[z] = ' ';

			// Stitch value and shader program together. (Is there a faster way?)
			shaderProgram = shaderProgram.subString(0,DefFinder) + DefIter->getValue() 
					+ shaderProgram.subString(DefFinder,shaderProgram.size() - 1);
		}
	}

	return shaderProgram;
}