--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ossrv_pub/boost_apis/boost/pending/stringtok.hpp Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,111 @@
+// (C) Copyright Jeremy Siek 2004
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+/*
+ * stringtok.hpp -- Breaks a string into tokens. This is an example for lib3.
+ *
+ * Template function looks like this:
+ *
+ * template <typename Container>
+ * void stringtok (Container &l,
+ * string const &s,
+ * char const * const ws = " \t\n");
+ *
+ * A nondestructive version of strtok() that handles its own memory and can
+ * be broken up by any character(s). Does all the work at once rather than
+ * in an invocation loop like strtok() requires.
+ *
+ * Container is any type that supports push_back(a_string), although using
+ * list<string> and deque<string> are indicated due to their O(1) push_back.
+ * (I prefer deque<> because op[]/at() is available as well.) The first
+ * parameter references an existing Container.
+ *
+ * s is the string to be tokenized. From the parameter declaration, it can
+ * be seen that s is not affected. Since references-to-const may refer to
+ * temporaries, you could use stringtok(some_container, readline("")) when
+ * using the GNU readline library.
+ *
+ * The final parameter is an array of characters that serve as whitespace.
+ * Whitespace characters default to one or more of tab, space, and newline,
+ * in any combination.
+ *
+ * 'l' need not be empty on entry. On return, 'l' will have the token
+ * strings appended.
+ *
+ *
+ * [Example:
+ * list<string> ls;
+ * stringtok (ls, " this \t is\t\n a test ");
+ * for (list<string>::const_iterator i = ls.begin();
+ * i != ls.end(); ++i)
+ * {
+ * cerr << ':' << (*i) << ":\n";
+ * }
+ *
+ * would print
+ * :this:
+ * :is:
+ * :a:
+ * :test:
+ * -end example]
+ *
+ * pedwards@jaj.com May 1999
+*/
+
+
+#include <string>
+#include <cstring> // for strchr
+
+
+/*****************************************************************
+ * This is the only part of the implementation that I don't like.
+ * It can probably be improved upon by the reader...
+*/
+
+ inline bool
+ isws (char c, char const * const wstr)
+ {
+ using namespace std;
+ return (strchr(wstr,c) != NULL);
+ }
+
+
+namespace boost {
+
+/*****************************************************************
+ * Simplistic and quite Standard, but a bit slow. This should be
+ * templatized on basic_string instead, or on a more generic StringT
+ * that just happens to support ::size_type, .substr(), and so on.
+ * I had hoped that "whitespace" would be a trait, but it isn't, so
+ * the user must supply it. Enh, this lets them break up strings on
+ * different things easier than traits would anyhow.
+*/
+template <typename Container>
+void
+stringtok (Container &l, std::string const &s, char const * const ws = " \t\n")
+{
+ typedef std::string::size_type size_type;
+ const size_type S = s.size();
+ size_type i = 0;
+
+ while (i < S) {
+ // eat leading whitespace
+ while ((i < S) && (isws(s[i],ws))) ++i;
+ if (i == S) return; // nothing left but WS
+
+ // find end of word
+ size_type j = i+1;
+ while ((j < S) && (!isws(s[j],ws))) ++j;
+
+ // add word
+ l.push_back(s.substr(i,j-i));
+
+ // set up for next loop
+ i = j+1;
+ }
+}
+
+
+} // namespace boost