Linux Certif

Toute la documentation sur la certification Linux LPI

string.3bobcat

NAME

FBB::String - Several extensions to std::string

SYNOPSIS

#include <bobcat/string>
Linking option: -lbobcat

DESCRIPTION

This class offers the same functionality as std::string, adding facilities for often used transformations, currently missing in std::string.

NAMESPACE

FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.

INHERITS FROM

--

ENUMERATION

o

Type:
This enumeration has the following values, which are used in the second variant of the split member (see below):

DQUOTE, a series of characters surrounded by double quotes in the original string;

DQUOTE_UNTERMINATED, a series of characters beginning with a double quote in the original string, but lacking the matching terminating double quote;

ESCAPED_END, a series of characters representing an otherwise normal string, but terminating in a plain backslash;

NORMAL, a normal string;

SEPARATOR, a separator;

SQUOTE, a series of characters surrounded by single quotes in the original string;

SQUOTE_UNTERMINATED, a series of characters beginning with a single quote in the original string, but lacking the matching terminating single quote.

TYPEDEF

The typedef SplitPair represents std::pair<std::string, String::Type> and is used in the second variant of the split member (see below).

HISTORY

Initially this class was derived from std::string. Deriving from std::string, however, is considerd bad design as std::string was not designed as a base-class.

Currently String offers a series of static member functions providing the facilities originally implemented in non-static members.

STATIC MEMBER FUNCTIONS

o

char const **argv(std::vector<std::string> const &words):
Returns a pointer to an allocated series of pointers to the C strings stored in the vector words. The caller is responsible for returning the array of pointers to the common pool, but should not delete the C-strings to which the pointers point. The last element of the returned array is guaranteed to be a 0-pointer.

o

int casecmp(std::string const &lhs, std::string const &rhs):
Performs a case-insensitive comparison between the two std::string objects. A negative value is returned if lhs should be ordered before rhs; 0 is returned if the two strings have identical contents; a positive value is returned if the lhs object should be ordered beyond rhs.

o

std::string escape(std::string const &str, char const *series = "'\"\\"):
Returns a copy of the str object in which all characters in series are prefixed by a backslash character.

o

std::string lc(std::string const &str) const:
Returns a copy of the str object in which all letters were transformed to lower case letters.

o

std::string trim(std::string const &str):
Returns a copy of the str object from which the leading and trailing blanks have been removed.

o

size_t split(std::vector<std::string> *words, std::string const &str, char const *separators = " \t", bool addEmpty = false):
Fills words with all elements of the str object, separated by any of the characters in separators. If the parameter addEmpty is set to true, the individual separators are stored as empty strings in words. If a word starts with " or ' all characters until a matching terminating " or ' at the end of a word are considered as one word. The surrounding quotes are not stored. The function returns the number of elements in the vector pointed to by words. This vector is initially cleared.

o

size_t split(std::vector<SplitPair> *words, std::string const &str, char const *separators = " \t", bool addEmpty = false):
Same functionality as the former member, but the words vector is filled with pairs, of which the first elements are the recognized strings, and the second elements values of the String::Type enumeration. If addEmpty is requested, then the string elements contain the actual contents of the separator, while the Type elements are set to SEPARATOR.

o

std::string unescape(std::string const &str):
Returns a copy of the str object in which the escaped (i.e., prefixed by a backslash) characters have been interpreted. All standard escape characters (\a, \b, \f, \n, \r, \t, \v) are recognized. If an escape character is followed by x the next two characters are interpreted as a hexadecimal number. If an escape character is followed by an octal digit, then the next three characters following the backslash are interpreted as an octal number. In all other cases, the backslash is removed and the character following the backslash is kept.

o

std::string uc(std::string const &str):
Returns a copy of the str object in which all letters were capitalized.

EXAMPLE

 
 #include <iostream>
 #include <vector>
 
 #include <bobcat/string>
 
 using namespace std;
 using namespace FBB;
 
 char const *type[] = 
 {
     "DQUOTE_UNTERMINATED",
     "SQUOTE_UNTERMINATED",
     "ESCAPED_END",
     "SEPARATOR",
     "NORMAL",
     "DQUOTE",
     "SQUOTE",
 };
 
 int main(int argc, char **argv)
 {
     cout << "Program's name in uppercase: " << String::uc(argv[0]) << endl;
 
     if (argc == 1)
         cout << "Provide any argument to suppress SEPARATOR fields\n";
 
     while (true)
     {
         cout << "Enter a line, or empty line to stop:" << endl;
 
         String line;
         if (!getline(cin, line) || !line.length())
             break;
 
         vector<String::SplitPair> splitpair;
         cout << "Split into " << line.split(&splitpair, " \t", argc == 1) << 
                 " fields\n"; 
         for 
         (
             vector<String::SplitPair>::iterator it = splitpair.begin();
                 it != splitpair.end();
                     ++it
         )
             cout << (it - splitpair.begin() + 1) << ": " <<
                     type[it->second] << ": `" << it->first << 
                     "', unescaped: `" << String(it->first).unescape() << 
                     "'" << endl;
     }
     return 0;
 }
     
 

FILES

bobcat/string - defines the class interface

SEE ALSO

bobcat(7)

BUGS

None Reported.

DISTRIBUTION FILES

o

bobcat_2.08.01-x.dsc: detached signature;

o

bobcat_2.08.01-x.tar.gz: source archive;

o

bobcat_2.08.01-x_i386.changes: change log;

o

libbobcat1_2.08.01-x_*.deb: debian package holding the libraries;

o

libbobcat1-dev_2.08.01-x_*.deb: debian package holding the libraries, headers and manual pages;

o

http://sourceforge.net/projects/bobcat: public archive location;

BOBCAT

Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.

COPYRIGHT

This is free software, distributed under the terms of the GNU General Public License (GPL).

AUTHOR

Frank B. Brokken (f.b.brokken@rug.nl).