wxStringTokenizer helps you to break a string up into a number of tokens. It replaces the standard C function strtok() and also extends it in a number of ways.
To use this class, you should create a wxStringTokenizer object, give it the string to tokenize and also the delimiters which separate tokens in the string (by default, white space characters will be used).
Then GetNextToken may be called repeatedly until it HasMoreTokens returns false.
For example:
wxStringTokenizer tkz(wxT("first:second:third:fourth"), wxT(":"));
while ( tkz.HasMoreTokens() )
{
wxString token = tkz.GetNextToken();
// process token here
}
By default, wxStringTokenizer will behave in the same way as strtok() if
the delimiters string only contains white space characters but, unlike the
standard function, it will return empty tokens if this is not the case. This
is helpful for parsing strictly formatted data where the number of fields is
fixed but some of them may be empty (i.e. TAB or comma delimited text
files).The behaviour is governed by the last constructor/SetString parameter mode which may be one of the following:
| wxTOKEN_DEFAULT | Default behaviour (as described above): same as wxTOKEN_STRTOK if the delimiter string contains only whitespaces, same as wxTOKEN_RET_EMPTY otherwise |
| wxTOKEN_RET_EMPTY | In this mode, the empty tokens in the middle of the string will be returned, i.e. "a::b:" will be tokenized in three tokens 'a', '' and 'b'. |
| wxTOKEN_RET_EMPTY_ALL | In this mode, empty trailing token (after the last delimiter character) will be returned as well. The string as above will contain four tokens: the already mentioned ones and another empty one as the last one. |
| wxTOKEN_RET_DELIMS | In this mode, the delimiter character after the end of the current token (there may be none if this is the last token) is returned appended to the token. Otherwise, it is the same mode as wxTOKEN_RET_EMPTY. |
| wxTOKEN_STRTOK | In this mode the class behaves exactly like the standard strtok() function. The empty tokens are never returned. |
Derived from
Include files
<wx/tokenzr.h>
Members
wxStringTokenizer::wxStringTokenizer
wxStringTokenizer::CountTokens
wxStringTokenizer::HasMoreTokens
wxStringTokenizer::GetNextToken
wxStringTokenizer::GetPosition
wxStringTokenizer::GetString
wxStringTokenizer::SetString
wxStringTokenizer()
Default constructor. You must call SetString before calling any other methods.
wxStringTokenizer(const wxString& str, const wxString& delims = " \t\r\n", wxStringTokenizerMode mode = wxTOKEN_DEFAULT)
Constructor. Pass the string to tokenize, a string containing delimiters and the mode specifying how the string should be tokenized.
int CountTokens() const
Returns the number of tokens remaining in the input string. The number of tokens returned by this function is decremented each time GetNextToken is called and when it reaches 0 HasMoreTokens returns false.
bool HasMoreTokens() const
Returns true if the tokenizer has further tokens, false if none are left.
wxString GetNextToken()
Returns the next token or empty string if the end of string was reached.
size_t GetPosition() const
Returns the current position (i.e. one index after the last returned token or 0 if GetNextToken() has never been called) in the original string.
wxString GetString() const
Returns the part of the starting string without all token already extracted.
void SetString(const wxString& to_tokenize, const wxString& delims = " \t\r\n", wxStringTokenizerMode mode = wxTOKEN_DEFAULT)
Initializes the tokenizer.
Pass the string to tokenize, a string containing delimiters, and the mode specifying how the string should be tokenized.