fold3d.mm

/*
	Copyright (c) 2018 James W. Walker

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	SOFTWARE.
*/
#import "BBLMInterface.h"
#import "BBLMTextIterator.h"

#import "FindLanguageType.h"
#import "LMMessageName.h"
#import "ScanForFolds.h"
#import "CalculateRuns.h"

extern "C"
{
__attribute__((visibility("default")))
	OSErr	FoldMain( BBLMParamBlock &params,
				const BBLMCallbackBlock &bblmCallbacks);
}



#pragma mark -


static void	GuessLanguage( BBLMParamBlock &params )
{
	UInt32	theType = GetLanguageType( params );
	
	DEBUG_LOG(@"Fo3D: Does the text match the language %c%c%c%c? ",
		(char)(params.fLanguage >> 24),
		(char)(params.fLanguage >> 16),
		(char)(params.fLanguage >> 8),
		(char)(params.fLanguage) );

	if (theType == params.fLanguage)
	{
		params.fGuessLanguageParams.fGuessResult = kBBLMGuessDefiniteYes;
		DEBUG_LOG(@"Yes");
	}
	else
	{
		params.fGuessLanguageParams.fGuessResult = kBBLMGuessDefiniteNo;
		DEBUG_LOG(@"No");
	}
}

#pragma mark -

OSErr	FoldMain( BBLMParamBlock &params,
			const BBLMCallbackBlock &bblmCallbacks )
{
	OSErr	result = noErr;
	
	//
	//	a language module must always make sure that the parameter block
	//	is valid by checking the signature, version number, and size
	//	of the parameter block. Note also that version 2 is the first
	//	usable version of the parameter block; anything older should
	//	be rejected.
	//
	
	//
	//	RMS 010925 the check for params.fVersion > kBBLMParamBlockVersion
	//	is overly strict, since there are no structural changes that would
	//	break backward compatibility; only new members are added.
	//

	if ((params.fSignature != kBBLMParamBlockSignature) ||
		(params.fVersion == 0) ||
		(params.fVersion < 2) ||
		(params.fLength < sizeof(BBLMParamBlock)))
	{
		return paramErr;
	}
	
#if DEBUG
	if (params.fMessage != kBBLMRunKindForWordMessage)
	{
		DEBUG_LOG(@"Fold3D: message %s for language %c%c%c%c, length %d",
			LMMessageName(params.fMessage),
			(char)(params.fLanguage >> 24),
			(char)(params.fLanguage >> 16),
			(char)(params.fLanguage >> 8),
			(char)(params.fLanguage),
			(int)params.fTextLength );
	}
#endif
	
	switch (params.fMessage)
	{
		case kBBLMInitMessage:
		case kBBLMDisposeMessage:
			break;
		
		case kBBLMScanForFoldRangesMessage:
			ScanForFolds( params, bblmCallbacks );
			break;
	
		case kBBLMGuessLanguageMessage:
			GuessLanguage( params );
			break;
		
		case kBBLMCalculateRunsMessage:
			CalculateRuns( params, bblmCallbacks );
			break;
		
		case kBBLMAdjustRangeMessage:
			DEBUG_LOG(@"Adjust range (%d, %d) origStart %d, kind %@",
				(int)params.fAdjustRangeParams.fStartIndex,
				(int)params.fAdjustRangeParams.fEndIndex,
				(int)params.fAdjustRangeParams.fOrigStartIndex,
				params.fAdjustRangeParams.fOrigStartRun.runKind );
			break;
		
		case kBBLMAdjustEndMessage:
			DEBUG_LOG(@"Adjust end %d", (int)params.fAdjustEndParams.fEndOffset );
			break;
			
		default:
			result = userCanceledErr;
			break;
	}
	
	return result;
}