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1 | \section{\class{wxStringTokenizer}}\label{wxstringtokenizer} | |
2 | ||
3 | wxStringTokenizer helps you to break a string up into a number of tokens. It | |
4 | replaces the standard C function {\tt strtok()} and also extends it in a | |
5 | number of ways. | |
6 | ||
7 | To use this class, you should create a wxStringTokenizer object, give it the | |
8 | string to tokenize and also the delimiters which separate tokens in the string | |
9 | (by default, white space characters will be used). | |
10 | ||
11 | Then \helpref{GetNextToken}{wxstringtokenizergetnexttoken} may be called | |
12 | repeatedly until it \helpref{HasMoreTokens}{wxstringtokenizerhasmoretokens} | |
13 | returns FALSE. | |
14 | ||
15 | For example: | |
16 | ||
17 | \begin{verbatim} | |
18 | ||
19 | wxStringTokenizer tkz("first:second:third:fourth", ":"); | |
20 | while ( tkz.HasMoreTokens() ) | |
21 | { | |
22 | wxString token = tkz.GetNextToken(); | |
23 | ||
24 | // process token here | |
25 | } | |
26 | \end{verbatim} | |
27 | ||
28 | By default, wxStringTokenizer will behave in the same way as {\tt strtok()} if | |
29 | the delimiters string only contains white space characters but, unlike the | |
30 | standard function, it will return empty tokens if this is not the case. This | |
31 | is helpful for parsing strictly formatted data where the number of fields is | |
32 | fixed but some of them may be empty (i.e. {\tt TAB} or comma delimited text | |
33 | files). | |
34 | ||
35 | The behaviour is governed by the last | |
36 | \helpref{constructor}{wxstringtokenizerwxstringtokenizer}/\helpref{SetString}{wxstringtokenizersetstring} | |
37 | parameter {\tt mode} which may be one of the following: | |
38 | ||
39 | \twocolwidtha{5cm}% | |
40 | \begin{twocollist}\itemsep=0pt | |
41 | \twocolitem{{\tt wxTOKEN\_DEFAULT}}{Default behaviour (as described above): | |
42 | same as {\tt wxTOKEN\_STRTOK} if the delimiter string contains only | |
43 | whitespaces, same as {\tt wxTOKEN\_RET\_EMPTY} otherwise} | |
44 | \twocolitem{{\tt wxTOKEN\_RET\_EMPTY}}{In this mode, the empty tokens in the | |
45 | middle of the string will be returned, i.e. {\tt "a::b:"} will be tokenized in | |
46 | three tokens `a', `' and `b'.} | |
47 | \twocolitem{{\tt wxTOKEN\_RET\_EMPTY\_ALL}}{In this mode, empty trailing token | |
48 | (after the last delimiter character) will be returned as well. The string as | |
49 | above will contain four tokens: the already mentioned ones and another empty | |
50 | one as the last one.} | |
51 | \twocolitem{{\tt wxTOKEN\_RET\_DELIMS}}{In this mode, the delimiter character | |
52 | after the end of the current token (there may be none if this is the last | |
53 | token) is returned appended to the token. Otherwise, it is the same mode as | |
54 | {\tt wxTOKEN\_RET\_EMPTY}.} | |
55 | \twocolitem{{\tt wxTOKEN\_STRTOK}}{In this mode the class behaves exactly like | |
56 | the standard {\tt strtok()} function. The empty tokens are never returned.} | |
57 | \end{twocollist} | |
58 | ||
59 | \wxheading{Derived from} | |
60 | ||
61 | \helpref{wxObject}{wxobject} | |
62 | ||
63 | \wxheading{Include files} | |
64 | ||
65 | <wx/tokenzr.h> | |
66 | ||
67 | \latexignore{\rtfignore{\wxheading{Members}}} | |
68 | ||
69 | \membersection{wxStringTokenizer::wxStringTokenizer}\label{wxstringtokenizerwxstringtokenizer} | |
70 | ||
71 | \func{}{wxStringTokenizer}{\void} | |
72 | ||
73 | Default constructor. You must call | |
74 | \helpref{SetString}{wxstringtokenizersetstring} before calling any other | |
75 | methods. | |
76 | ||
77 | \func{}{wxStringTokenizer}{\param{const wxString\& }{str}, \param{const wxString\& }{delims = " $\backslash$t$\backslash$r$\backslash$n"}, \param{wxStringTokenizerMode }{mode = wxTOKEN\_DEFAULT}} | |
78 | ||
79 | Constructor. Pass the string to tokenize, a string containing delimiters | |
80 | and the mode specifying how the string should be tokenized. | |
81 | ||
82 | \membersection{wxStringTokenizer::CountTokens}\label{wxstringtokenizercounttokens} | |
83 | ||
84 | \constfunc{int}{CountTokens}{\void} | |
85 | ||
86 | Returns the number of tokens in the input string. | |
87 | ||
88 | \membersection{wxStringTokenizer::HasMoreTokens}\label{wxstringtokenizerhasmoretokens} | |
89 | ||
90 | \constfunc{bool}{HasMoreTokens}{\void} | |
91 | ||
92 | Returns TRUE if the tokenizer has further tokens, FALSE if none are left. | |
93 | ||
94 | \membersection{wxStringTokenizer::GetNextToken}\label{wxstringtokenizergetnexttoken} | |
95 | ||
96 | \func{wxString}{GetNextToken}{\void} | |
97 | ||
98 | Returns the next token or empty string if the end of string was reached. | |
99 | ||
100 | \membersection{wxStringTokenizer::GetPosition}\label{wxstringtokenizergetposition} | |
101 | ||
102 | \constfunc{size\_t}{GetPosition}{\void} | |
103 | ||
104 | Returns the current position (i.e. one index after the last returned | |
105 | token or 0 if GetNextToken() has never been called) in the original | |
106 | string. | |
107 | ||
108 | \membersection{wxStringTokenizer::GetString}\label{wxstringtokenizergetstring} | |
109 | ||
110 | \constfunc{wxString}{GetString}{\void} | |
111 | ||
112 | Returns the part of the starting string without all token already extracted. | |
113 | ||
114 | \membersection{wxStringTokenizer::SetString}\label{wxstringtokenizersetstring} | |
115 | ||
116 | \func{void}{SetString}{\param{const wxString\& }{to\_tokenize}, \param{const wxString\& }{delims = " $\backslash$t$\backslash$r$\backslash$n"}, \param{wxStringTokenizerMode }{mode = wxTOKEN\_DEFAULT}} | |
117 | ||
118 | Initializes the tokenizer. | |
119 | ||
120 | Pass the string to tokenize, a string containing delimiters, | |
121 | and the mode specifying how the string should be tokenized. | |
122 |