123 lines
2.5 KiB
C++
123 lines
2.5 KiB
C++
// src/StringSplitter.hh
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// This file is part of libpbe; see http://decimail.org
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// (C) 2004 Philip Endecott
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef libpbe_StringSplitter_hh
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#define libpbe_StringSplitter_hh
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#include <string>
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using namespace std;
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class StringSplitter {
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protected:
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const string& str;
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std::string::size_type start;
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std::string::size_type end;
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bool init;
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bool last;
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bool past_end;
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public:
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StringSplitter ( const string& s ):
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str(s), start(0), init(false), last(false), past_end(false) {}
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virtual ~StringSplitter() {}
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bool exhausted(void) const {
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return past_end;
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}
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string operator*(void) /*const*/ {
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if (!init) {
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find_end();
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init=true;
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}
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return str.substr(start,end-start);
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}
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void operator++(void) {
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if (last) {
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past_end=true;
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} else {
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if (!init) {
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find_end();
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init=true;
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}
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find_next_start();
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find_end();
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}
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}
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private:
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virtual void find_next_start(void) = 0;
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virtual void find_end(void) = 0;
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};
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class StringSplitterSeq: public StringSplitter {
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private:
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const string split_seq;
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public:
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StringSplitterSeq ( const string& s, const string ss ):
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StringSplitter(s), split_seq(ss) {}
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private:
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void find_next_start(void) {
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start = end+split_seq.size();
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}
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void find_end(void) {
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end = str.find(split_seq,start);
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if (end==str.npos) {
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end=str.size();
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last=true;
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}
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}
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};
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class StringSplitterAny: public StringSplitter {
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private:
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const string split_chars;
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public:
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StringSplitterAny ( const string& s, const string sc ):
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StringSplitter(s), split_chars(sc) {}
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private:
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void find_next_start(void) {
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start = end+1;
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}
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private:
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void find_end(void) {
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end = str.find_first_of(split_chars,start);
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if (end==str.npos) {
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end=str.size();
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last=true;
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}
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}
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};
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#endif
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