Class TDelimitedParserBase8

class TDelimitedParserBase8;

Description

Comments : Provides non-modifying functionality for parsing data delimited by a single character. The data is delimited into segments. Uses 8-bit descriptors.

The object contains a descriptor with the data which can be parsed from left to right, or right to left. It is non-owning. The current segment can be extracted, which then parses the string for the next segment.

This is a base class and an object of this type cannot be instantiated. It should be derived. The derived class should ensure that the data iDataDes is set before calling one of the protected parsing functions. The derived class should also ensure that the delimiting character has been set.

If the data iDataDes has not been parsed, then calling any functionality that requires the data to have been parsed will result in a panic KDelimitedParserErrNotParsed. The data can only be parsed by calling one of the protected parsing functions from the derived class.

If the delimiting character iDelimiter has not been set, then calling the protected parsing functions and some of the other public functionality that requires the delimiter to be set will result in a panic KDelimitingParserErrNoDelimiter.

Members

Defined in TDelimitedParserBase8:

• BackDelimiter()constChecks for a delimiter at the back (right) of the data.
• Dec()constParses back to the previous segment.
• Des()constRetrieves the descriptor reference with the data
• Eos()constIndicates whether the end of the data has been reached and there are no more seg...
• FrontDelimiter()constChecks for a delimiter at the front (left) of the data.
• GetNext(TPtrC8 &)constRetrieves the current segment and then parses the data to the next one.
• Inc()constParses to the next segment.
• Parse(const TDesC8 &)This parses the data into segments from left to right.
• ParseReverse(const TDesC8 &)This parses the data into segments from lright to left.
• Peek(TPtrC8 &)constRetrieves the current segment.
• Remainder(TPtrC8 &)constGives the remainder of the data from (and including) the current segment. Any ot...
• Reset()constResets the internal pointer position to the start or end or the descriptor depen...
• SetDelimiter(TChar)Sets the delimiting character.
• TDelimitedParserBase8()Constructor.

protected: IMPORT_C TDelimitedParserBase8();

Description

Constructor.

IMPORT_C void Reset() const;

Description

Resets the internal pointer position to the start or end or the descriptor depending on whether the decriptor is parsing mode.

IMPORT_C TInt GetNext(TPtrC8 &aSegment) const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Retrieves the current segment and then parses the data to the next one.

Post-Condition

The current segment is updated to the next one.

Parameters

Return value

IMPORT_C TInt Inc() const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Parses to the next segment.

Post-Condition

The current segment is updated to the next one.

Return value

IMPORT_C TInt Dec() const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Parses back to the previous segment.

Post-Condition

If the parse was successful then the current segment is updated to the previous one. Otherwise there is no change.

Return value

IMPORT_C TInt Peek(TPtrC8 &aSegment) const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Retrieves the current segment.

Parameters

Return value

IMPORT_C TBool Eos() const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Indicates whether the end of the data has been reached and there are no more segments to parse.

Return value

IMPORT_C TBool FrontDelimiter() const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Checks for a delimiter at the front (left) of the data.

Return value

IMPORT_C TBool BackDelimiter() const;

Pre-Condition

The string must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Checks for a delimiter at the back (right) of the data.

Return value

IMPORT_C const TDesC8& Des() const;

Description

Retrieves the descriptor reference with the data

Return value

IMPORT_C TInt Remainder(TPtrC8 &aRemainder) const;

Pre-Condition

The data must have been initially parsed by TDelimitedParserBase8::Parse(const TDesC8 &) or TDelimitedParserBase8::ParseReverse(const TDesC8 &).

Description

Gives the remainder of the data from (and including) the current segment. Any other segments that have parsed through are not included.

Parameters

Return value

protected: IMPORT_C void Parse(const TDesC8 &aData);

Pre-Condition

The delimiter must have been set.

Description

This parses the data into segments from left to right.

Post-Condition

The current segment is the leftmost segment and the direction of parsing is set from left to right (EDelimitedDataFroward).

Parameters

protected: IMPORT_C void ParseReverse(const TDesC8 &aData);

Pre-Condition

The delimiter must have been set.

Description

This parses the data into segments from lright to left.

Post-Condition

The current segment is the leftmost segment and the direction of parsing is set from right to left (EDelimitedDataReverse).

Parameters

protected: IMPORT_C void SetDelimiter(TChar aDelimiter);

Description

Sets the delimiting character.

Post-Condition

The delimiting character is set.

Parameters