Provided by: libbobcat-dev_3.19.01-1ubuntu1_amd64 
NAME
FBB::String - Several operations on std::string objects
SYNOPSIS
#include <bobcat/string>
Linking option: -lbobcat
DESCRIPTION
This class offers facilities for often used transformations on std::string objects, but
which are not supported by the std::string class itself. All members of FBB::String are
static.
NAMESPACE
FBB
All members, operators and manipulators, mentioned in this man-page, are defined in the
namespace FBB.
INHERITS FROM
--
ENUMERATION
o Type:
This enumeration indicates the nature of the contents of an element in the array
returned by the overloaded split members (see below).
DQUOTE, a subset of the characters in the matching string element was delimited by
double quotes in the in the string that was parsed by the split members.
DQUOTE_UNTERMINATED, the contents of the string that was parsed by the split
members started at some point with a double quote, but the matching ending double
quote was lacking.
ESCAPED_END, the contents of the string that was parsed by the split members ended
in a mere backslash.
NORMAL, a normal string;
SEPARATOR, a separator;
SQUOTE, a subset of the characters in the matching string element was delimited by
quotes in the in the string that was parsed by the split members.
SQUOTE_UNTERMINATED, the contents of the string that was parsed by the split
members started at some point with a quote, but the matching ending quote was
lacking.
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.
FBB::String offers a series of static member functions providing the facilities originally
implemented as 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 std::vector<std::string> split(Type *type, std::string const &str, char const
*separators = " \t", bool addEmpty = false):
Returns a vector containing the elements in str which are separated from each other
by at least one of the characters found in *separators. The member’s first
parameter points to a Type variable, which will show DQUOTE_UNTERMINATED,
SQUOTE_UNTERMINATED, or ESCAPED_END in cases where the contents of str are
ill-formed, or NORMAL if str’s contents shows not syntactic errors (i.e.,
ill-formed strings or escape-sequences). If the corresponding argument equals 0
then no Type indication is provided.
If the parameter addEmpty is set to true, then individual separators encountered in
str are stored as empty strings in words (e.g., if two elements are separated by
three blank spaces, then the returned vector contains three empty strings between
the two elements).
If an element in str contains a double quote ("), then all characters from the
initial double quote through the matching double quote character are processed as
follows: the surrounding double quotes are removed, and the remaining characters
are unescaped using the String::unescape member. The resulting unescaped string is
added to the element currently under construction. E.g., if str contains
string="\"hello world\""
then the element becomes
string="hello world"
If an element in str contains a single quote (’), then all characters between the
initial quote and the matching quote character are literally appended to the
element currently under construction. E.g., if str contains
string=’"hello\ world"’
then the element becomes
string="hello\ world"
Backslash characters encountered in str outside of single or double quoted strings
are unescaped (using String::unescape) and the resulting character is appended to
the element currently under construction.
E.g., if str contains
string=\"hello\ world\"
then the element becomes
string="hello world"
o std::vector<SplitPair> split(std::string const &str, char const *separators = "
\t", bool addEmpty = false):
Same functionality as the previous split member, but the words vector is filled
with pairs, of which the first elements represent the recognized strings, and the
second elements are 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. If the returned vector is not empty
then the second member of the last element may be DQUOTE_UNTERMINATED,
SQUOTE_UNTERMINATED, or ESCAPED_END in cases where the contents of str are
ill-formed.
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_3.19.01-x.dsc: detached signature;
o bobcat_3.19.01-x.tar.gz: source archive;
o bobcat_3.19.01-x_i386.changes: change log;
o libbobcat1_3.19.01-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_3.19.01-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).