cStringTokenizer Class Reference

Description

String tokenizer that supports quoted strings and nested parenthesis.

It considers the input string to consist of tokens, separated by one or more delimiter characters. Repeated calls to nextToken() will enumerate the tokens in the string, returning nullptr after the last token. The function hasMoreTokens() can be used to find out whether there are more tokens without consuming one. There is also an asVector() method that returns all tokens at once in a string vector.

By default, tokens are trimmed of leading and trailing whitespace, and empty tokens are discarded. Trimming and empty token discarding can be turned off by specifying the NO_TRIM and KEEP_EMPTY options to the constructor, respectively.

KEEP_EMPTY is advised for delimiters that act as field separators, such as comma, semicolon, colon or tab. When KEEP_EMPTY is enabled, the number of tokens returned is #separators+1, except for empty input which produces zero items, and blank input which produces zero or one token, depending on whether NO_TRIM was also specified.

The tokenizer may be asked not to split up substrings protected by a pair of quote characters ("string constants"). This is enabled with the HONOR_QUOTES option. Use backslash escaping to put quote chars inside strings: "Hello \" World". The list of characters to be treated as quotation marks can be specified, the default is double quote " and apostrophe '. Unterminated string constants will be reported with an exception.

The tokenizer may also be asked not to split up parenthesized expressions. This is enabled with the HONOR_PARENS option. The list of character pairs (open+close) to be treated as parens can be specified, the default is parens, square brackets and curly braces. Proper paren nesting is checked, and mismatches, unterminated and unmatched parens are reported with an exception.

Example 1:

const char *str = "one two three four";
cStringTokenizer tokenizer(str);
while (tokenizer.hasMoreTokens())
    EV << " " << tokenizer.nextToken();

Example 2:

const char *str = "42 13 46 72 41";
std::vector<string> array = cStringTokenizer(str).asVector();

Public Member Functions
	cStringTokenizer (const char *str, const char *sep=" \t\n\r\f")
	cStringTokenizer (const char *str, const char *delimiters, int options)
	~cStringTokenizer ()
void	setDelimiterChars (const char *s)
void	setQuoteChars (const char *quotes)
void	setParenthesisChars (const char *parens)
bool	hasMoreTokens ()
const char *	nextToken ()
std::vector< std::string >	asVector ()
std::vector< int >	asIntVector ()
std::vector< double >	asDoubleVector ()

Constructor & Destructor Documentation

cStringTokenizer() [1/2]

cStringTokenizer ( const char *  str, const char *  sep = " \t\n\r\f"  )

inline

Sets up a tokenizer to split the input string by whitespace, trim all tokens, and discard empty tokens.

cStringTokenizer() [2/2]

cStringTokenizer	(	const char *	str,
		const char *	delimiters,
		int	options
	)

Sets up a tokenizer to split the input string by the selected delimiters, and options.

~cStringTokenizer()

~cStringTokenizer

(

)

Destructor.

Member Function Documentation

setDelimiterChars()

void setDelimiterChars

(

const char *

s

)

Sets the set of separator characters.

setQuoteChars()

void setQuoteChars

(

const char *

quotes

)

Sets the set of characters to act as quote characters. The default setting is double quote and apostrophe. This is only significant of honoring quotes is enabled.

setParenthesisChars()

void setParenthesisChars

(

const char *

parens

)

Sets the set of parenthesis characters. It must be an alternating sequence of open/close characters. The default is "()[]{}". This is only significant if honoring parentheses is enabled.

hasMoreTokens()

bool hasMoreTokens

(

)

Returns true if there're more tokens (i.e. the next nextToken() call won't return nullptr).

nextToken()

const char* nextToken

(

)

Returns the next token. The returned pointers will stay valid as long as the tokenizer object exists. If there're no more tokens, nullptr will be returned.

asVector()

std::vector<std::string> asVector

(

)

Utility function: tokenizes the full input string at once, and returns the tokens in a string vector.

asIntVector()

std::vector<int> asIntVector

(

)

Utility function: converts all tokens to int, and returns them in a vector.

asDoubleVector()

std::vector<double> asDoubleVector

(

)

Utility function: converts all tokens to double, and returns them in a vector.

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The documentation for this class was generated from the following file:

• cstringtokenizer.h