startsWith

Short summary

This assertion method checks if the current string stringToCheck starts with string start. Processed strings must be in UTF-8 encoding

Attention: All strings are handled as null-terminated byte streams

Parameters

Name	Type	Comment	Kind
stringToCheck	POINTER TO BYTE	current string to check	input
start	POINTER TO BYTE	expected start of stringToCheck	input
ignoreCases	BOOL	TRUE means ignore cases; FALSE means that cases must be equal too	input
trim	BOOL	TRUE means truncation of spaces on the left side of stringToCheck	input
message	AssertMessage	message if the assertion is false	input
normalizeStrings	BOOL	normalize both strings for check	input

Code

Declaration

METHOD startsWith
VAR_INPUT
	(* current string to check *)
	stringToCheck	:POINTER TO BYTE;
	(* expected start of ``stringToCheck`` *)
	start			:POINTER TO BYTE;
	(* ``TRUE`` means ignore cases; ``FALSE`` means that cases must be equal too *)
	ignoreCases		:BOOL;
	(* ``TRUE`` means truncation of spaces on the left side of ``stringToCheck``*)
	trim		:BOOL;
	(* message if the assertion is false *)
	message			:AssertMessage;
	(*normalize both strings for check*)
	normalizeStrings :BOOL := TRUE;
END_VAR
VAR
	(* length of ``stringToCheck`` in bytes *)
	lengthStringToCheckInByte	:UDINT;	
	(* length of ``searchString`` in bytes *)
	lengthSearchStringInByte	:UDINT;
	(* DWORD array we use to check *)
	usedCodePointsToCheck, normalizedUsedCodePointsToCheck :POINTER TO CNM_UnicodeUtilities.UnicodeCodePoint;
	usedCodePointToCheckCount	:UDINT;
	
	(* DWORD array we use to compare *)
	usedStartCodePoints, normalizedUsedStartCodePoints :POINTER TO CNM_UnicodeUtilities.UnicodeCodePoint;
	usedStartCodePointCount		:UDINT;
END_VAR
VAR CONSTANT
	(*After decomposition one codepoint can extend up to 4 codepoints*)
	NORMALIZATION_FACTOR :UDINT := 4;
END_VAR

Implementation

CNM_UnicodeUtilities.GetUtf8StringLength(stringAddress := stringToCheck, byteCount => lengthStringToCheckInByte);
CNM_UnicodeUtilities.GetUtf8StringLength(stringAddress := start, byteCount => lengthSearchStringInByte);

IF (((
		NOT normalizeStrings 
	) OR ( 
		lengthStringToCheckInByte = 0
	) OR (
		lengthSearchStringInByte = 0
	)) AND_THEN(
		NOT THIS^.isContainsCheckNecessary(
			stringToCheck		:= stringToCheck,
			searchString		:= start,
			lengthStringToCheck	:= lengthStringToCheckInByte,
			lengthSearchString	:= lengthSearchStringInByte,
			additionalText		:= THIS^.getDebugInfo('startsWith'),
			message				:= message
		) 
	)
) THEN
	RETURN;
END_IF

usedCodePointsToCheck := __NEW(CNM_UnicodeUtilities.UnicodeCodePoint, lengthStringToCheckInByte);
IF (usedCodePointsToCheck = 0) THEN
	THIS^.assertionWasWrong(message, THIS^.getDebugInfo('startsWith, malloc failed'));
	RETURN;
END_IF

usedStartCodePoints := __NEW(CNM_UnicodeUtilities.UnicodeCodePoint, lengthSearchStringInByte);
IF (usedStartCodePoints = 0) THEN
	__DELETE(usedCodePointsToCheck);
	THIS^.assertionWasWrong(message, THIS^.getDebugInfo('startsWith, malloc failed'));
	RETURN;
END_IF

(* convert ``stringToCheck`` to code points *)
CNM_UnicodeUtilities.GetCodepointsFromUtf8String(
	utf8StringAddress := stringToCheck, 
	utf8StringByteCount := lengthStringToCheckInByte, 
	codePointBuffer := usedCodePointsToCheck,
	bufferSize := SIZEOF(CNM_UnicodeUtilities.UnicodeCodePoint)*lengthStringToCheckInByte, 
	codePointsCount => usedCodePointToCheckCount);

(* convert ``searchString`` to code points *)
CNM_UnicodeUtilities.GetCodepointsFromUtf8String(
	utf8StringAddress 	:= start, 
	utf8StringByteCount := lengthSearchStringInByte, 
	codePointBuffer	:= usedStartCodePoints,
	bufferSize := SIZEOF(CNM_UnicodeUtilities.UnicodeCodePoint)*lengthSearchStringInByte,
	codePointsCount => usedStartCodePointCount);



IF normalizeStrings THEN
	normalizedUsedCodePointsToCheck := __NEW(
		CNM_UnicodeUtilities.UnicodeCodePoint,
		(lengthStringToCheckInByte * NORMALIZATION_FACTOR)
	);
	IF (normalizedUsedCodePointsToCheck = 0) THEN
		THIS^.assertionWasWrong(message, THIS^.getDebugInfo('startsWith, malloc failed'));
		__DELETE(usedCodePointsToCheck);
		__DELETE(usedStartCodePoints);
		RETURN;
	END_IF
	normalizedUsedStartCodePoints := __NEW(
		CNM_UnicodeUtilities.UnicodeCodePoint,
		(lengthSearchStringInByte * NORMALIZATION_FACTOR)
	);
	IF (normalizedUsedStartCodePoints = 0) THEN
		THIS^.assertionWasWrong(message, THIS^.getDebugInfo('startsWith, malloc failed'));
		__DELETE(usedCodePointsToCheck);
		__DELETE(usedStartCodePoints);
		__DELETE(normalizedUsedCodePointsToCheck);	
		RETURN;
	END_IF

	CNM_UnicodeUtilities.NormalizeCodepointsFormD(
		codePoints := usedCodePointsToCheck,
		codePointsCount := usedCodePointToCheckCount,
		normalizedCodepoints := normalizedUsedCodePointsToCheck,
		bufferSize := (lengthStringToCheckInByte * NORMALIZATION_FACTOR) * SIZEOF(CNM_UnicodeUtilities.UnicodeCodePoint),
		normalizedCodepointsCount => usedCodePointToCheckCount
	);
	__DELETE(usedCodePointsToCheck);
	usedCodePointsToCheck := normalizedUsedCodePointsToCheck;
	
	CNM_UnicodeUtilities.NormalizeCodepointsFormD(
		codePoints := usedStartCodePoints,
		codePointsCount := usedStartCodePointCount,
		normalizedCodepoints := normalizedUsedStartCodePoints,
		bufferSize := (lengthSearchStringInByte * NORMALIZATION_FACTOR) * SIZEOF(CNM_UnicodeUtilities.UnicodeCodePoint),
		normalizedCodepointsCount => usedStartCodePointCount
	);
	__DELETE(usedStartCodePoints);
	usedStartCodePoints := normalizedUsedStartCodePoints;
END_IF

IF (trim) THEN
	CNM_UnicodeUtilities.TrimLeftCodepoints(
		codepoints := usedStartCodePoints,
		codepointCount := usedStartCodePointCount,
		newCodepointCount => usedStartCodePointCount
	);
	CNM_UnicodeUtilities.TrimLeftCodepoints(
		codepoints := usedCodePointsToCheck,
		codepointCount := usedCodePointToCheckCount,
		newCodepointCount => usedCodePointToCheckCount
	);
END_IF

IF (ignoreCases) THEN
	CNM_UnicodeUtilities.GetUpperCaseForCodepoint(usedCodePointsToCheck, usedCodePointToCheckCount);
	CNM_UnicodeUtilities.GetUpperCaseForCodepoint(usedStartCodePoints, usedStartCodePointCount);
END_IF

IF (Tc2_System.MEMCMP(
		usedCodePointsToCheck,
		usedStartCodePoints, 
		usedStartCodePointCount*SIZEOF(CNM_UnicodeUtilities.UnicodeCodePoint)
	) <> CNM_ReturnTypes.ComparationResult.EQUAL
) THEN
	THIS^.assertionWasWrong(message, THIS^.getDebugInfo('startsWith'));
END_IF;

__DELETE(usedCodePointsToCheck);
__DELETE(usedStartCodePoints);