652 lines
19 KiB
C++
652 lines
19 KiB
C++
// Boost token_functions.hpp ------------------------------------------------//
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// Copyright John R. Bandela 2001.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/tokenizer/ for documentation.
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// Revision History:
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// 01 Oct 2004 Joaquin M Lopez Munoz
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// Workaround for a problem with string::assign in msvc-stlport
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// 06 Apr 2004 John Bandela
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// Fixed a bug involving using char_delimiter with a true input iterator
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// 28 Nov 2003 Robert Zeh and John Bandela
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// Converted into "fast" functions that avoid using += when
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// the supplied iterator isn't an input_iterator; based on
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// some work done at Archelon and a version that was checked into
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// the boost CVS for a short period of time.
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// 20 Feb 2002 John Maddock
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// Removed using namespace std declarations and added
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// workaround for BOOST_NO_STDC_NAMESPACE (the library
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// can be safely mixed with regex).
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// 06 Feb 2002 Jeremy Siek
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// Added char_separator.
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// 02 Feb 2002 Jeremy Siek
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// Removed tabs and a little cleanup.
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#ifndef BOOST_TOKEN_FUNCTIONS_JRB120303_HPP_
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#define BOOST_TOKEN_FUNCTIONS_JRB120303_HPP_
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#include <vector>
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#include <stdexcept>
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#include <string>
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#include <cctype>
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#include <algorithm> // for find_if
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/throw_exception.hpp>
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#if !defined(BOOST_NO_CWCTYPE)
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#include <cwctype>
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#endif
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//
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// the following must not be macros if we are to prefix them
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// with std:: (they shouldn't be macros anyway...)
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//
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#ifdef ispunct
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# undef ispunct
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#endif
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#ifdef iswpunct
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# undef iswpunct
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#endif
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#ifdef isspace
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# undef isspace
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#endif
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#ifdef iswspace
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# undef iswspace
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#endif
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//
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// fix namespace problems:
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//
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#ifdef BOOST_NO_STDC_NAMESPACE
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namespace std{
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using ::ispunct;
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using ::isspace;
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#if !defined(BOOST_NO_CWCTYPE)
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using ::iswpunct;
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using ::iswspace;
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#endif
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}
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#endif
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namespace boost{
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//===========================================================================
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// The escaped_list_separator class. Which is a model of TokenizerFunction
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// An escaped list is a super-set of what is commonly known as a comma
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// separated value (csv) list.It is separated into fields by a comma or
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// other character. If the delimiting character is inside quotes, then it is
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// counted as a regular character.To allow for embedded quotes in a field,
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// there can be escape sequences using the \ much like C.
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// The role of the comma, the quotation mark, and the escape
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// character (backslash \), can be assigned to other characters.
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struct escaped_list_error : public std::runtime_error{
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escaped_list_error(const std::string& what_arg):std::runtime_error(what_arg) { }
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};
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// The out of the box GCC 2.95 on cygwin does not have a char_traits class.
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// MSVC does not like the following typename
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template <class Char,
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class Traits = BOOST_DEDUCED_TYPENAME std::basic_string<Char>::traits_type >
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class escaped_list_separator {
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private:
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typedef std::basic_string<Char,Traits> string_type;
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struct char_eq {
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Char e_;
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char_eq(Char e):e_(e) { }
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bool operator()(Char c) {
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return Traits::eq(e_,c);
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}
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};
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string_type escape_;
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string_type c_;
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string_type quote_;
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bool last_;
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bool is_escape(Char e) {
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char_eq f(e);
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return std::find_if(escape_.begin(),escape_.end(),f)!=escape_.end();
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}
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bool is_c(Char e) {
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char_eq f(e);
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return std::find_if(c_.begin(),c_.end(),f)!=c_.end();
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}
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bool is_quote(Char e) {
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char_eq f(e);
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return std::find_if(quote_.begin(),quote_.end(),f)!=quote_.end();
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}
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template <typename iterator, typename Token>
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void do_escape(iterator& next,iterator end,Token& tok) {
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if (++next == end)
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BOOST_THROW_EXCEPTION(escaped_list_error(std::string("cannot end with escape")));
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if (Traits::eq(*next,'n')) {
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tok+='\n';
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return;
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}
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else if (is_quote(*next)) {
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tok+=*next;
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return;
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}
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else if (is_c(*next)) {
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tok+=*next;
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return;
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}
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else if (is_escape(*next)) {
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tok+=*next;
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return;
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}
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else
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BOOST_THROW_EXCEPTION(escaped_list_error(std::string("unknown escape sequence")));
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}
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public:
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explicit escaped_list_separator(Char e = '\\',
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Char c = ',',Char q = '\"')
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: escape_(1,e), c_(1,c), quote_(1,q), last_(false) { }
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escaped_list_separator(string_type e, string_type c, string_type q)
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: escape_(e), c_(c), quote_(q), last_(false) { }
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void reset() {last_=false;}
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template <typename InputIterator, typename Token>
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bool operator()(InputIterator& next,InputIterator end,Token& tok) {
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bool bInQuote = false;
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tok = Token();
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if (next == end) {
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if (last_) {
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last_ = false;
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return true;
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}
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else
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return false;
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}
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last_ = false;
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for (;next != end;++next) {
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if (is_escape(*next)) {
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do_escape(next,end,tok);
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}
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else if (is_c(*next)) {
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if (!bInQuote) {
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// If we are not in quote, then we are done
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++next;
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// The last character was a c, that means there is
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// 1 more blank field
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last_ = true;
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return true;
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}
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else tok+=*next;
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}
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else if (is_quote(*next)) {
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bInQuote=!bInQuote;
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}
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else {
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tok += *next;
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}
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}
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return true;
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}
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};
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//===========================================================================
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// The classes here are used by offset_separator and char_separator to implement
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// faster assigning of tokens using assign instead of +=
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namespace tokenizer_detail {
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//===========================================================================
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// Tokenizer was broken for wide character separators, at least on Windows, since
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// CRT functions isspace etc only expect values in [0, 0xFF]. Debug build asserts
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// if higher values are passed in. The traits extension class should take care of this.
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// Assuming that the conditional will always get optimized out in the function
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// implementations, argument types are not a problem since both forms of character classifiers
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// expect an int.
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#if !defined(BOOST_NO_CWCTYPE)
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template<typename traits, int N>
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struct traits_extension_details : public traits {
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typedef typename traits::char_type char_type;
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static bool isspace(char_type c)
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{
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return std::iswspace(c) != 0;
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}
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static bool ispunct(char_type c)
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{
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return std::iswpunct(c) != 0;
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}
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};
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template<typename traits>
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struct traits_extension_details<traits, 1> : public traits {
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typedef typename traits::char_type char_type;
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static bool isspace(char_type c)
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{
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return std::isspace(c) != 0;
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}
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static bool ispunct(char_type c)
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{
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return std::ispunct(c) != 0;
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}
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};
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#endif
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// In case there is no cwctype header, we implement the checks manually.
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// We make use of the fact that the tested categories should fit in ASCII.
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template<typename traits>
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struct traits_extension : public traits {
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typedef typename traits::char_type char_type;
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static bool isspace(char_type c)
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{
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#if !defined(BOOST_NO_CWCTYPE)
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return traits_extension_details<traits, sizeof(char_type)>::isspace(c);
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#else
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return static_cast< unsigned >(c) <= 255 && std::isspace(c) != 0;
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#endif
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}
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static bool ispunct(char_type c)
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{
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#if !defined(BOOST_NO_CWCTYPE)
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return traits_extension_details<traits, sizeof(char_type)>::ispunct(c);
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#else
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return static_cast< unsigned >(c) <= 255 && std::ispunct(c) != 0;
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#endif
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}
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};
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// The assign_or_plus_equal struct contains functions that implement
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// assign, +=, and clearing based on the iterator type. The
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// generic case does nothing for plus_equal and clearing, while
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// passing through the call for assign.
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//
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// When an input iterator is being used, the situation is reversed.
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// The assign method does nothing, plus_equal invokes operator +=,
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// and the clearing method sets the supplied token to the default
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// token constructor's result.
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//
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template<class IteratorTag>
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struct assign_or_plus_equal {
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template<class Iterator, class Token>
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static void assign(Iterator b, Iterator e, Token &t) {
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t.assign(b, e);
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}
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template<class Token, class Value>
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static void plus_equal(Token &, const Value &) { }
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// If we are doing an assign, there is no need for the
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// the clear.
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//
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template<class Token>
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static void clear(Token &) { }
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};
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template <>
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struct assign_or_plus_equal<std::input_iterator_tag> {
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template<class Iterator, class Token>
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static void assign(Iterator , Iterator , Token &) { }
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template<class Token, class Value>
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static void plus_equal(Token &t, const Value &v) {
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t += v;
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}
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template<class Token>
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static void clear(Token &t) {
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t = Token();
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}
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};
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template<class Iterator>
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struct pointer_iterator_category{
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typedef std::random_access_iterator_tag type;
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};
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template<class Iterator>
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struct class_iterator_category{
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typedef typename Iterator::iterator_category type;
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};
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// This portably gets the iterator_tag without partial template specialization
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template<class Iterator>
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struct get_iterator_category{
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typedef typename mpl::if_<is_pointer<Iterator>,
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pointer_iterator_category<Iterator>,
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class_iterator_category<Iterator>
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>::type cat;
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typedef typename cat::type iterator_category;
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};
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} // namespace tokenizer_detail
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//===========================================================================
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// The offset_separator class, which is a model of TokenizerFunction.
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// Offset breaks a string into tokens based on a range of offsets
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class offset_separator {
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private:
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std::vector<int> offsets_;
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unsigned int current_offset_;
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bool wrap_offsets_;
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bool return_partial_last_;
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public:
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template <typename Iter>
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offset_separator(Iter begin, Iter end, bool wrap_offsets = true,
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bool return_partial_last = true)
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: offsets_(begin,end), current_offset_(0),
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wrap_offsets_(wrap_offsets),
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return_partial_last_(return_partial_last) { }
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offset_separator()
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: offsets_(1,1), current_offset_(),
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wrap_offsets_(true), return_partial_last_(true) { }
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void reset() {
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current_offset_ = 0;
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}
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template <typename InputIterator, typename Token>
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bool operator()(InputIterator& next, InputIterator end, Token& tok)
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{
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typedef tokenizer_detail::assign_or_plus_equal<
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BOOST_DEDUCED_TYPENAME tokenizer_detail::get_iterator_category<
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InputIterator
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>::iterator_category
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> assigner;
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BOOST_ASSERT(!offsets_.empty());
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assigner::clear(tok);
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InputIterator start(next);
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if (next == end)
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return false;
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if (current_offset_ == offsets_.size())
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{
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if (wrap_offsets_)
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current_offset_=0;
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else
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return false;
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}
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int c = offsets_[current_offset_];
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int i = 0;
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for (; i < c; ++i) {
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if (next == end)break;
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assigner::plus_equal(tok,*next++);
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}
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assigner::assign(start,next,tok);
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if (!return_partial_last_)
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if (i < (c-1) )
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return false;
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++current_offset_;
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return true;
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}
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};
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//===========================================================================
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// The char_separator class breaks a sequence of characters into
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// tokens based on the character delimiters (very much like bad old
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// strtok). A delimiter character can either be kept or dropped. A
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// kept delimiter shows up as an output token, whereas a dropped
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// delimiter does not.
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// This class replaces the char_delimiters_separator class. The
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// constructor for the char_delimiters_separator class was too
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// confusing and needed to be deprecated. However, because of the
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// default arguments to the constructor, adding the new constructor
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// would cause ambiguity, so instead I deprecated the whole class.
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// The implementation of the class was also simplified considerably.
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enum empty_token_policy { drop_empty_tokens, keep_empty_tokens };
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// The out of the box GCC 2.95 on cygwin does not have a char_traits class.
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template <typename Char,
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typename Tr = BOOST_DEDUCED_TYPENAME std::basic_string<Char>::traits_type >
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class char_separator
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{
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typedef tokenizer_detail::traits_extension<Tr> Traits;
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typedef std::basic_string<Char,Tr> string_type;
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public:
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explicit
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char_separator(const Char* dropped_delims,
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const Char* kept_delims = 0,
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empty_token_policy empty_tokens = drop_empty_tokens)
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: m_dropped_delims(dropped_delims),
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m_use_ispunct(false),
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m_use_isspace(false),
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m_empty_tokens(empty_tokens),
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m_output_done(false)
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{
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// Borland workaround
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if (kept_delims)
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m_kept_delims = kept_delims;
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}
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// use ispunct() for kept delimiters and isspace for dropped.
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explicit
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char_separator()
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: m_use_ispunct(true),
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m_use_isspace(true),
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m_empty_tokens(drop_empty_tokens) { }
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void reset() { }
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template <typename InputIterator, typename Token>
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bool operator()(InputIterator& next, InputIterator end, Token& tok)
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{
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typedef tokenizer_detail::assign_or_plus_equal<
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BOOST_DEDUCED_TYPENAME tokenizer_detail::get_iterator_category<
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InputIterator
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>::iterator_category
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> assigner;
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assigner::clear(tok);
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// skip past all dropped_delims
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if (m_empty_tokens == drop_empty_tokens)
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for (; next != end && is_dropped(*next); ++next)
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{ }
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InputIterator start(next);
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if (m_empty_tokens == drop_empty_tokens) {
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if (next == end)
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return false;
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// if we are on a kept_delims move past it and stop
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if (is_kept(*next)) {
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assigner::plus_equal(tok,*next);
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++next;
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} else
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// append all the non delim characters
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for (; next != end && !is_dropped(*next) && !is_kept(*next); ++next)
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assigner::plus_equal(tok,*next);
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}
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else { // m_empty_tokens == keep_empty_tokens
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// Handle empty token at the end
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if (next == end)
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{
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if (m_output_done == false)
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{
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m_output_done = true;
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assigner::assign(start,next,tok);
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return true;
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}
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else
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return false;
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}
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if (is_kept(*next)) {
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if (m_output_done == false)
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m_output_done = true;
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else {
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assigner::plus_equal(tok,*next);
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++next;
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m_output_done = false;
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}
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}
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else if (m_output_done == false && is_dropped(*next)) {
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m_output_done = true;
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}
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else {
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if (is_dropped(*next))
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start=++next;
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for (; next != end && !is_dropped(*next) && !is_kept(*next); ++next)
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assigner::plus_equal(tok,*next);
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m_output_done = true;
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}
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}
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assigner::assign(start,next,tok);
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return true;
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}
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private:
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string_type m_kept_delims;
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string_type m_dropped_delims;
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bool m_use_ispunct;
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bool m_use_isspace;
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empty_token_policy m_empty_tokens;
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bool m_output_done;
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bool is_kept(Char E) const
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{
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if (m_kept_delims.length())
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return m_kept_delims.find(E) != string_type::npos;
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else if (m_use_ispunct) {
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return Traits::ispunct(E) != 0;
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} else
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return false;
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}
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bool is_dropped(Char E) const
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{
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if (m_dropped_delims.length())
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return m_dropped_delims.find(E) != string_type::npos;
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else if (m_use_isspace) {
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return Traits::isspace(E) != 0;
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} else
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return false;
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}
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};
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//===========================================================================
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// The following class is DEPRECATED, use class char_separators instead.
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//
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|
// The char_delimiters_separator class, which is a model of
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|
// TokenizerFunction. char_delimiters_separator breaks a string
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|
// into tokens based on character delimiters. There are 2 types of
|
|
// delimiters. returnable delimiters can be returned as
|
|
// tokens. These are often punctuation. nonreturnable delimiters
|
|
// cannot be returned as tokens. These are often whitespace
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|
|
|
// The out of the box GCC 2.95 on cygwin does not have a char_traits class.
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|
template <class Char,
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|
class Tr = BOOST_DEDUCED_TYPENAME std::basic_string<Char>::traits_type >
|
|
class char_delimiters_separator {
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|
private:
|
|
|
|
typedef tokenizer_detail::traits_extension<Tr> Traits;
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|
typedef std::basic_string<Char,Tr> string_type;
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|
string_type returnable_;
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|
string_type nonreturnable_;
|
|
bool return_delims_;
|
|
bool no_ispunct_;
|
|
bool no_isspace_;
|
|
|
|
bool is_ret(Char E)const
|
|
{
|
|
if (returnable_.length())
|
|
return returnable_.find(E) != string_type::npos;
|
|
else{
|
|
if (no_ispunct_) {return false;}
|
|
else{
|
|
int r = Traits::ispunct(E);
|
|
return r != 0;
|
|
}
|
|
}
|
|
}
|
|
bool is_nonret(Char E)const
|
|
{
|
|
if (nonreturnable_.length())
|
|
return nonreturnable_.find(E) != string_type::npos;
|
|
else{
|
|
if (no_isspace_) {return false;}
|
|
else{
|
|
int r = Traits::isspace(E);
|
|
return r != 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
public:
|
|
explicit char_delimiters_separator(bool return_delims = false,
|
|
const Char* returnable = 0,
|
|
const Char* nonreturnable = 0)
|
|
: returnable_(returnable ? returnable : string_type().c_str()),
|
|
nonreturnable_(nonreturnable ? nonreturnable:string_type().c_str()),
|
|
return_delims_(return_delims), no_ispunct_(returnable!=0),
|
|
no_isspace_(nonreturnable!=0) { }
|
|
|
|
void reset() { }
|
|
|
|
public:
|
|
|
|
template <typename InputIterator, typename Token>
|
|
bool operator()(InputIterator& next, InputIterator end,Token& tok) {
|
|
tok = Token();
|
|
|
|
// skip past all nonreturnable delims
|
|
// skip past the returnable only if we are not returning delims
|
|
for (;next!=end && ( is_nonret(*next) || (is_ret(*next)
|
|
&& !return_delims_ ) );++next) { }
|
|
|
|
if (next == end) {
|
|
return false;
|
|
}
|
|
|
|
// if we are to return delims and we are one a returnable one
|
|
// move past it and stop
|
|
if (is_ret(*next) && return_delims_) {
|
|
tok+=*next;
|
|
++next;
|
|
}
|
|
else
|
|
// append all the non delim characters
|
|
for (;next!=end && !is_nonret(*next) && !is_ret(*next);++next)
|
|
tok+=*next;
|
|
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
|
|
} //namespace boost
|
|
|
|
#endif
|