-// -*- C++ -*-
-// Boost general library 'format' ---------------------------
-// See http://www.boost.org for updates, documentation, and revision history.
-
-// (C) Samuel Krempp 2001
-// krempp@crans.ens-cachan.fr
-// Permission to copy, use, modify, sell and
-// distribute this software is granted provided this copyright notice appears
-// in all copies. This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
-
-// ideas taken from Rudiger Loos's format class
-// and Karl Nelson's ofstream (also took its parsing code as basis for printf parsing)
-
-// ------------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// parsing.hpp : implementation of the parsing member functions
// ( parse, parse_printf_directive)
-// ------------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+
+// Copyright Samuel Krempp 2003. Use, modification, and distribution are
+// subject to 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)
+
+// see http://www.boost.org/libs/format for library home page
+// ----------------------------------------------------------------------------
#ifndef BOOST_FORMAT_PARSING_HPP
#define BOOST_FORMAT_PARSING_HPP
#include <boost/format/format_class.hpp>
+#include <boost/format/exceptions.hpp>
#include <boost/throw_exception.hpp>
#include <boost/assert.hpp>
namespace io {
namespace detail {
- template<class Ch, class Stream> inline
- bool wrap_isdigit(Ch c, Stream &os)
- {
-#ifndef BOOST_NO_LOCALE_ISIDIGIT
- return std::isdigit(c, os.rdbuf()->getloc() );
+#if defined(BOOST_NO_STD_LOCALE)
+ // streams will be used for narrow / widen. but these methods are not const
+ template<class T>
+ T& const_or_not(const T& x) {
+ return const_cast<T&> (x);
+ }
+#else
+ template<class T>
+ const T& const_or_not(const T& x) {
+ return x;
+ }
+#endif
+
+ template<class Ch, class Facet> inline
+ char wrap_narrow(const Facet& fac, Ch c, char deflt) {
+ return const_or_not(fac).narrow(c, deflt);
+ }
+
+ template<class Ch, class Facet> inline
+ bool wrap_isdigit(const Facet& fac, Ch c) {
+#if ! defined( BOOST_NO_LOCALE_ISDIGIT )
+ return fac.is(std::ctype<Ch>::digit, c);
# else
- using namespace std;
- return isdigit(c);
+ (void) fac; // remove "unused parameter" warning
+ using namespace std;
+ return isdigit(c);
#endif
- } //end- wrap_isdigit(..)
-
- template<class Res, class Ch, class Tr> inline
- Res str2int(const std::basic_string<Ch, Tr>& s,
- typename std::basic_string<Ch, Tr>::size_type start,
- BOOST_IO_STD basic_ios<Ch,Tr> &os,
- const Res = Res(0) )
- // Input : char string, with starting index
- // a basic_ios& merely to call its widen/narrow member function in the desired locale.
- // Effects : reads s[start:] and converts digits into an integral n, of type Res
+ }
+
+ template<class Iter, class Facet>
+ Iter wrap_scan_notdigit(const Facet & fac, Iter beg, Iter end) {
+ using namespace std;
+ for( ; beg!=end && wrap_isdigit(fac, *beg); ++beg) ;
+ return beg;
+ }
+
+
+ // Input : [start, last) iterators range and a
+ // a Facet to use its widen/narrow member function
+ // Effects : read sequence and convert digits into integral n, of type Res
// Returns : n
- {
- Res n = 0;
- while(start<s.size() && wrap_isdigit(s[start], os) ) {
- char cur_ch = os.narrow( s[start], 0);
- BOOST_ASSERT(cur_ch != 0 ); // since we called isdigit, this should not happen.
- n *= 10;
- n += cur_ch - '0'; // 22.2.1.1.2 of the C++ standard
- ++start;
+ template<class Res, class Iter, class Facet>
+ Iter str2int (const Iter & start, const Iter & last, Res & res,
+ const Facet& fac)
+ {
+ using namespace std;
+ Iter it;
+ res=0;
+ for(it=start; it != last && wrap_isdigit(fac, *it); ++it ) {
+ char cur_ch = wrap_narrow(fac, *it, 0); // cant fail.
+ res *= 10;
+ res += cur_ch - '0'; // 22.2.1.1.2.13 of the C++ standard
+ }
+ return it;
}
- return n;
- }
- template<class Ch, class Tr>
- void skip_asterisk(const std::basic_string<Ch,Tr> & buf,
- typename std::basic_string<Ch,Tr>::size_type * pos_p,
- BOOST_IO_STD basic_ios<Ch, Tr> &os)
// skip printf's "asterisk-fields" directives in the format-string buf
// Input : char string, with starting index *pos_p
- // a basic_ios& merely to call its widen/narrow member function in the desired locale.
+ // a Facet merely to use its widen/narrow member function
// Effects : advance *pos_p by skipping printf's asterisk fields.
// Returns : nothing
- {
- using namespace std;
- BOOST_ASSERT( pos_p != 0);
- if(*pos_p >= buf.size() ) return;
- if(buf[ *pos_p]==os.widen('*')) {
- ++ (*pos_p);
- while (*pos_p < buf.size() && wrap_isdigit(buf[*pos_p],os)) ++(*pos_p);
- if(buf[*pos_p]==os.widen('$')) ++(*pos_p);
+ template<class Iter, class Facet>
+ Iter skip_asterisk(Iter start, Iter last, const Facet& fac)
+ {
+ using namespace std;
+ ++ start;
+ start = wrap_scan_notdigit(fac, start, last);
+ if(start!=last && *start== const_or_not(fac).widen( '$') )
+ ++start;
+ return start;
}
- }
- inline void maybe_throw_exception( unsigned char exceptions)
// auxiliary func called by parse_printf_directive
// for centralising error handling
// it either throws if user sets the corresponding flag, or does nothing.
- {
- if(exceptions & io::bad_format_string_bit)
- boost::throw_exception(io::bad_format_string());
- }
+ inline void maybe_throw_exception(unsigned char exceptions,
+ std::size_t pos, std::size_t size)
+ {
+ if(exceptions & io::bad_format_string_bit)
+ boost::throw_exception(io::bad_format_string(pos, size) );
+ }
+ // Input: the position of a printf-directive in the format-string
+ // a basic_ios& merely to use its widen/narrow member function
+ // a bitset'exceptions' telling whether to throw exceptions on errors.
+ // Returns:
+ // true if parse succeeded (ignore some errors if exceptions disabled)
+ // false if it failed so bad that the directive should be printed verbatim
+ // Effects:
+ // start is incremented so that *start is the first char after
+ // this directive
+ // *fpar is set with the parameters read in the directive
+ template<class Ch, class Tr, class Alloc, class Iter, class Facet>
+ bool parse_printf_directive(Iter & start, const Iter& last,
+ detail::format_item<Ch, Tr, Alloc> * fpar,
+ const Facet& fac,
+ std::size_t offset, unsigned char exceptions)
+ {
+ typedef typename basic_format<Ch, Tr, Alloc>::format_item_t format_item_t;
+
+ fpar->argN_ = format_item_t::argN_no_posit; // if no positional-directive
+ bool precision_set = false;
+ bool in_brackets=false;
+ Iter start0 = start;
+ std::size_t fstring_size = last-start0+offset;
+
+ if(start>= last) { // empty directive : this is a trailing %
+ maybe_throw_exception(exceptions, start-start0 + offset, fstring_size);
+ return false;
+ }
+
+ if(*start== const_or_not(fac).widen( '|')) {
+ in_brackets=true;
+ if( ++start >= last ) {
+ maybe_throw_exception(exceptions, start-start0 + offset, fstring_size);
+ return false;
+ }
+ }
- template<class Ch, class Tr>
- bool parse_printf_directive(const std::basic_string<Ch, Tr> & buf,
- typename std::basic_string<Ch, Tr>::size_type * pos_p,
- detail::format_item<Ch, Tr> * fpar,
- BOOST_IO_STD basic_ios<Ch,Tr> &os,
- unsigned char exceptions)
- // Input : a 'printf-directive' in the format-string, starting at buf[ *pos_p ]
- // a basic_ios& merely to call its widen/narrow member function in the desired locale.
- // a bitset'excpetions' telling whether to throw exceptions on errors.
- // Returns : true if parse somehow succeeded (possibly ignoring errors if exceptions disabled)
- // false if it failed so bad that the directive should be printed verbatim
- // Effects : - *pos_p is incremented so that buf[*pos_p] is the first char after the directive
- // - *fpar is set with the parameters read in the directive
- {
- typedef format_item<Ch, Tr> format_item_t;
- BOOST_ASSERT( pos_p != 0);
- typename std::basic_string<Ch, Tr>::size_type &i1 = *pos_p,
- i0;
- fpar->argN_ = format_item_t::argN_no_posit; // if no positional-directive
-
- bool in_brackets=false;
- if(buf[i1]==os.widen('|'))
- {
- in_brackets=true;
- if( ++i1 >= buf.size() ) {
- maybe_throw_exception(exceptions);
- return false;
+ // the flag '0' would be picked as a digit for argument order, but here it's a flag :
+ if(*start== const_or_not(fac).widen( '0'))
+ goto parse_flags;
+
+ // handle argument order (%2$d) or possibly width specification: %2d
+ if(wrap_isdigit(fac, *start)) {
+ int n;
+ start = str2int(start, last, n, fac);
+ if( start >= last ) {
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ return false;
+ }
+
+ // %N% case : this is already the end of the directive
+ if( *start == const_or_not(fac).widen( '%') ) {
+ fpar->argN_ = n-1;
+ ++start;
+ if( in_brackets)
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ // but don't return. maybe "%" was used in lieu of '$', so we go on.
+ else
+ return true;
+ }
+
+ if ( *start== const_or_not(fac).widen( '$') ) {
+ fpar->argN_ = n-1;
+ ++start;
+ }
+ else {
+ // non-positionnal directive
+ fpar->fmtstate_.width_ = n;
+ fpar->argN_ = format_item_t::argN_no_posit;
+ goto parse_precision;
+ }
}
- }
-
- // the flag '0' would be picked as a digit for argument order, but here it's a flag :
- if(buf[i1]==os.widen('0'))
- goto parse_flags;
-
- // handle argument order (%2$d) or possibly width specification: %2d
- i0 = i1; // save position before digits
- while (i1 < buf.size() && wrap_isdigit(buf[i1], os))
- ++i1;
- if (i1!=i0)
- {
- if( i1 >= buf.size() ) {
- maybe_throw_exception(exceptions);
- return false;
+
+ parse_flags:
+ // handle flags
+ while ( start != last) { // as long as char is one of + - = _ # 0 l h or ' '
+ // misc switches
+ switch ( wrap_narrow(fac, *start, 0)) {
+ case '\'' : break; // no effect yet. (painful to implement)
+ case 'l':
+ case 'h': // short/long modifier : for printf-comaptibility (no action needed)
+ break;
+ case '-':
+ fpar->fmtstate_.flags_ |= std::ios_base::left;
+ break;
+ case '=':
+ fpar->pad_scheme_ |= format_item_t::centered;
+ break;
+ case '_':
+ fpar->fmtstate_.flags_ |= std::ios_base::internal;
+ break;
+ case ' ':
+ fpar->pad_scheme_ |= format_item_t::spacepad;
+ break;
+ case '+':
+ fpar->fmtstate_.flags_ |= std::ios_base::showpos;
+ break;
+ case '0':
+ fpar->pad_scheme_ |= format_item_t::zeropad;
+ // need to know alignment before really setting flags,
+ // so just add 'zeropad' flag for now, it will be processed later.
+ break;
+ case '#':
+ fpar->fmtstate_.flags_ |= std::ios_base::showpoint | std::ios_base::showbase;
+ break;
+ default:
+ goto parse_width;
+ }
+ ++start;
+ } // loop on flag.
+
+ if( start>=last) {
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ return true;
+ }
+ parse_width:
+ // handle width spec
+ // first skip 'asterisk fields' : *, or *N$
+ if(*start == const_or_not(fac).widen( '*') )
+ start = skip_asterisk(start, last, fac);
+ if(start!=last && wrap_isdigit(fac, *start))
+ start = str2int(start, last, fpar->fmtstate_.width_, fac);
+
+ parse_precision:
+ if( start>= last) {
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ return true;
+ }
+ // handle precision spec
+ if (*start== const_or_not(fac).widen( '.')) {
+ ++start;
+ if(start != last && *start == const_or_not(fac).widen( '*') )
+ start = skip_asterisk(start, last, fac);
+ if(start != last && wrap_isdigit(fac, *start)) {
+ start = str2int(start, last, fpar->fmtstate_.precision_, fac);
+ precision_set = true;
+ }
+ else
+ fpar->fmtstate_.precision_ =0;
}
- int n=str2int(buf,i0, os, int(0) );
-
- // %N% case : this is already the end of the directive
- if( buf[i1] == os.widen('%') )
- {
- fpar->argN_ = n-1;
- ++i1;
- if( in_brackets)
- maybe_throw_exception(exceptions);
- // but don't return. maybe "%" was used in lieu of '$', so we go on.
- else return true;
- }
-
- if ( buf[i1]==os.widen('$') )
- {
- fpar->argN_ = n-1;
- ++i1;
- }
- else
- {
- // non-positionnal directive
- fpar->ref_state_.width_ = n;
- fpar->argN_ = format_item_t::argN_no_posit;
- goto parse_precision;
- }
- }
- parse_flags:
- // handle flags
- while ( i1 <buf.size()) // as long as char is one of + - = # 0 l h or ' '
- {
- // misc switches
- switch (os.narrow(buf[i1], 0))
- {
- case '\'' : break; // no effect yet. (painful to implement)
- case 'l':
- case 'h': // short/long modifier : for printf-comaptibility (no action needed)
- break;
- case '-':
- fpar->ref_state_.flags_ |= std::ios_base::left;
+ // handle formatting-type flags :
+ while( start != last && ( *start== const_or_not(fac).widen( 'l')
+ || *start== const_or_not(fac).widen( 'L')
+ || *start== const_or_not(fac).widen( 'h')) )
+ ++start;
+ if( start>=last) {
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ return true;
+ }
+
+ if( in_brackets && *start== const_or_not(fac).widen( '|') ) {
+ ++start;
+ return true;
+ }
+ switch ( wrap_narrow(fac, *start, 0) ) {
+ case 'X':
+ fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
+ case 'p': // pointer => set hex.
+ case 'x':
+ fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
+ fpar->fmtstate_.flags_ |= std::ios_base::hex;
break;
- case '=':
- fpar->pad_scheme_ |= format_item_t::centered;
+
+ case 'o':
+ fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
+ fpar->fmtstate_.flags_ |= std::ios_base::oct;
break;
- case ' ':
- fpar->pad_scheme_ |= format_item_t::spacepad;
+
+ case 'E':
+ fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
+ case 'e':
+ fpar->fmtstate_.flags_ &= ~std::ios_base::floatfield;
+ fpar->fmtstate_.flags_ |= std::ios_base::scientific;
+
+ fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
+ fpar->fmtstate_.flags_ |= std::ios_base::dec;
break;
- case '+':
- fpar->ref_state_.flags_ |= std::ios_base::showpos;
+
+ case 'f':
+ fpar->fmtstate_.flags_ &= ~std::ios_base::floatfield;
+ fpar->fmtstate_.flags_ |= std::ios_base::fixed;
+ case 'u':
+ case 'd':
+ case 'i':
+ fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
+ fpar->fmtstate_.flags_ |= std::ios_base::dec;
break;
- case '0':
- fpar->pad_scheme_ |= format_item_t::zeropad;
- // need to know alignment before really setting flags,
- // so just add 'zeropad' flag for now, it will be processed later.
+
+ case 'T':
+ ++start;
+ if( start >= last)
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ else
+ fpar->fmtstate_.fill_ = *start;
+ fpar->pad_scheme_ |= format_item_t::tabulation;
+ fpar->argN_ = format_item_t::argN_tabulation;
break;
- case '#':
- fpar->ref_state_.flags_ |= std::ios_base::showpoint | std::ios_base::showbase;
+ case 't':
+ fpar->fmtstate_.fill_ = const_or_not(fac).widen( ' ');
+ fpar->pad_scheme_ |= format_item_t::tabulation;
+ fpar->argN_ = format_item_t::argN_tabulation;
break;
- default:
- goto parse_width;
- }
- ++i1;
- } // loop on flag.
- if( i1>=buf.size()) {
- maybe_throw_exception(exceptions);
- return true;
+
+ case 'G':
+ fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
+ break;
+ case 'g': // 'g' conversion is default for floats.
+ fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
+ fpar->fmtstate_.flags_ |= std::ios_base::dec;
+
+ // CLEAR all floatield flags, so stream will CHOOSE
+ fpar->fmtstate_.flags_ &= ~std::ios_base::floatfield;
+ break;
+
+ case 'C':
+ case 'c':
+ fpar->truncate_ = 1;
+ break;
+ case 'S':
+ case 's':
+ if(precision_set) // handle truncation manually, with own parameter.
+ fpar->truncate_ = fpar->fmtstate_.precision_;
+ fpar->fmtstate_.precision_ = 6; // default stream precision.
+ break;
+ case 'n' :
+ fpar->argN_ = format_item_t::argN_ignored;
+ break;
+ default:
+ maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ }
+ ++start;
+
+ if( in_brackets ) {
+ if( start != last && *start== const_or_not(fac).widen( '|') ) {
+ ++start;
+ return true;
+ }
+ else maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
+ }
+ return true;
}
+ // -end parse_printf_directive()
- parse_width:
- // handle width spec
- skip_asterisk(buf, &i1, os); // skips 'asterisk fields' : *, or *N$
- i0 = i1; // save position before digits
- while (i1<buf.size() && wrap_isdigit(buf[i1], os))
- i1++;
-
- if (i1!=i0)
- { fpar->ref_state_.width_ = str2int( buf,i0, os, std::streamsize(0) ); }
+ template<class String, class Facet>
+ int upper_bound_from_fstring(const String& buf,
+ const typename String::value_type arg_mark,
+ const Facet& fac,
+ unsigned char exceptions)
+ {
+ // quick-parsing of the format-string to count arguments mark (arg_mark, '%')
+ // returns : upper bound on the number of format items in the format strings
+ using namespace boost::io;
+ typename String::size_type i1=0;
+ int num_items=0;
+ while( (i1=buf.find(arg_mark,i1)) != String::npos ) {
+ if( i1+1 >= buf.size() ) {
+ if(exceptions & bad_format_string_bit)
+ boost::throw_exception(bad_format_string(i1, buf.size() )); // must not end in ".. %"
+ else {
+ ++num_items;
+ break;
+ }
+ }
+ if(buf[i1+1] == buf[i1] ) {// escaped "%%"
+ i1+=2; continue;
+ }
- parse_precision:
- if( i1>=buf.size()) {
- maybe_throw_exception(exceptions);
- return true;
+ ++i1;
+ // in case of %N% directives, dont count it double (wastes allocations..) :
+ i1 = detail::wrap_scan_notdigit(fac, buf.begin()+i1, buf.end()) - buf.begin();
+ if( i1 < buf.size() && buf[i1] == arg_mark )
+ ++i1;
+ ++num_items;
+ }
+ return num_items;
}
- // handle precision spec
- if (buf[i1]==os.widen('.'))
- {
- ++i1;
- skip_asterisk(buf, &i1, os);
- i0 = i1; // save position before digits
- while (i1<buf.size() && wrap_isdigit(buf[i1], os))
- ++i1;
-
- if(i1==i0)
- fpar->ref_state_.precision_ = 0;
- else
- fpar->ref_state_.precision_ = str2int(buf,i0, os, std::streamsize(0) );
- }
-
- // handle formatting-type flags :
- while( i1<buf.size() &&
- ( buf[i1]==os.widen('l') || buf[i1]==os.widen('L') || buf[i1]==os.widen('h')) )
- ++i1;
- if( i1>=buf.size()) {
- maybe_throw_exception(exceptions);
- return true;
+ template<class String> inline
+ void append_string(String& dst, const String& src,
+ const typename String::size_type beg,
+ const typename String::size_type end) {
+#if !defined(BOOST_NO_STRING_APPEND)
+ dst.append(src.begin()+beg, src.begin()+end);
+#else
+ dst += src.substr(beg, end-beg);
+#endif
}
-
- if( in_brackets && buf[i1]==os.widen('|') )
- {
- ++i1;
- return true;
- }
- switch (os.narrow(buf[i1], 0) )
- {
- case 'X':
- fpar->ref_state_.flags_ |= std::ios_base::uppercase;
- case 'p': // pointer => set hex.
- case 'x':
- fpar->ref_state_.flags_ &= ~std::ios_base::basefield;
- fpar->ref_state_.flags_ |= std::ios_base::hex;
- break;
-
- case 'o':
- fpar->ref_state_.flags_ &= ~std::ios_base::basefield;
- fpar->ref_state_.flags_ |= std::ios_base::oct;
- break;
-
- case 'E':
- fpar->ref_state_.flags_ |= std::ios_base::uppercase;
- case 'e':
- fpar->ref_state_.flags_ &= ~std::ios_base::floatfield;
- fpar->ref_state_.flags_ |= std::ios_base::scientific;
-
- fpar->ref_state_.flags_ &= ~std::ios_base::basefield;
- fpar->ref_state_.flags_ |= std::ios_base::dec;
- break;
-
- case 'f':
- fpar->ref_state_.flags_ &= ~std::ios_base::floatfield;
- fpar->ref_state_.flags_ |= std::ios_base::fixed;
- case 'u':
- case 'd':
- case 'i':
- fpar->ref_state_.flags_ &= ~std::ios_base::basefield;
- fpar->ref_state_.flags_ |= std::ios_base::dec;
- break;
-
- case 'T':
- ++i1;
- if( i1 >= buf.size())
- maybe_throw_exception(exceptions);
- else
- fpar->ref_state_.fill_ = buf[i1];
- fpar->pad_scheme_ |= format_item_t::tabulation;
- fpar->argN_ = format_item_t::argN_tabulation;
- break;
- case 't':
- fpar->ref_state_.fill_ = os.widen(' ');
- fpar->pad_scheme_ |= format_item_t::tabulation;
- fpar->argN_ = format_item_t::argN_tabulation;
- break;
-
- case 'G':
- fpar->ref_state_.flags_ |= std::ios_base::uppercase;
- break;
- case 'g': // 'g' conversion is default for floats.
- fpar->ref_state_.flags_ &= ~std::ios_base::basefield;
- fpar->ref_state_.flags_ |= std::ios_base::dec;
-
- // CLEAR all floatield flags, so stream will CHOOSE
- fpar->ref_state_.flags_ &= ~std::ios_base::floatfield;
- break;
-
- case 'C':
- case 'c':
- fpar->truncate_ = 1;
- break;
- case 'S':
- case 's':
- fpar->truncate_ = fpar->ref_state_.precision_;
- fpar->ref_state_.precision_ = -1;
- break;
- case 'n' :
- fpar->argN_ = format_item_t::argN_ignored;
- break;
- default:
- maybe_throw_exception(exceptions);
- }
- ++i1;
-
- if( in_brackets )
- {
- if( i1<buf.size() && buf[i1]==os.widen('|') )
- {
- ++i1;
- return true;
- }
- else maybe_throw_exception(exceptions);
- }
- return true;
- }
} // detail namespace
} // io namespace
+
// -----------------------------------------------
// format :: parse(..)
-template<class Ch, class Traits>
-void basic_format<Ch, Traits> ::parse(const string_t & buf)
- // parse the format-string
-{
- using namespace std;
- const Ch arg_mark = oss_.widen('%');
- bool ordered_args=true;
- int max_argN=-1;
- typename string_t::size_type i1=0;
- int num_items=0;
-
- // A: find upper_bound on num_items and allocates arrays
- i1=0;
- while( (i1=buf.find(arg_mark,i1)) != string::npos )
- {
- if( i1+1 >= buf.size() ) {
- if(exceptions() & io::bad_format_string_bit)
- boost::throw_exception(io::bad_format_string()); // must not end in "bla bla %"
- else break; // stop there, ignore last '%'
- }
- if(buf[i1+1] == buf[i1] ) { i1+=2; continue; } // escaped "%%" / "##"
- ++i1;
-
- // in case of %N% directives, dont count it double (wastes allocations..) :
- while(i1 < buf.size() && io::detail::wrap_isdigit(buf[i1],oss_)) ++i1;
- if( i1 < buf.size() && buf[i1] == arg_mark ) ++ i1;
-
- ++num_items;
- }
- items_.assign( num_items, format_item_t() );
-
- // B: Now the real parsing of the format string :
- num_items=0;
- i1 = 0;
- typename string_t::size_type i0 = i1;
- bool special_things=false;
- int cur_it=0;
- while( (i1=buf.find(arg_mark,i1)) != string::npos )
- {
- string_t & piece = (cur_it==0) ? prefix_ : items_[cur_it-1].appendix_;
-
- if( buf[i1+1] == buf[i1] ) // escaped mark, '%%'
- {
- piece += buf.substr(i0, i1-i0) + buf[i1];
- i1+=2; i0=i1;
- continue;
- }
- BOOST_ASSERT( static_cast<unsigned int>(cur_it) < items_.size() || cur_it==0);
-
- if(i1!=i0) piece += buf.substr(i0, i1-i0);
- ++i1;
-
- bool parse_ok;
- parse_ok = io::detail::parse_printf_directive(buf, &i1, &items_[cur_it], oss_, exceptions());
- if( ! parse_ok ) continue; // the directive will be printed verbatim
-
- i0=i1;
- items_[cur_it].compute_states(); // process complex options, like zeropad, into stream params.
-
- int argN=items_[cur_it].argN_;
- if(argN == format_item_t::argN_ignored)
- continue;
- if(argN ==format_item_t::argN_no_posit)
- ordered_args=false;
- else if(argN == format_item_t::argN_tabulation) special_things=true;
- else if(argN > max_argN) max_argN = argN;
- ++num_items;
- ++cur_it;
- } // loop on %'s
- BOOST_ASSERT(cur_it == num_items);
-
- // store the final piece of string
- string_t & piece = (cur_it==0) ? prefix_ : items_[cur_it-1].appendix_;
- piece += buf.substr(i0);
+ template<class Ch, class Tr, class Alloc>
+ basic_format<Ch, Tr, Alloc>& basic_format<Ch, Tr, Alloc>::
+ parse (const string_type& buf) {
+ // parse the format-string
+ using namespace std;
+#if !defined(BOOST_NO_STD_LOCALE)
+ const std::ctype<Ch> & fac = BOOST_USE_FACET( std::ctype<Ch>, getloc());
+#else
+ io::basic_oaltstringstream<Ch, Tr, Alloc> fac;
+ //has widen and narrow even on compilers without locale
+#endif
+
+ const Ch arg_mark = io::detail::const_or_not(fac).widen( '%');
+ bool ordered_args=true;
+ int max_argN=-1;
+
+ // A: find upper_bound on num_items and allocates arrays
+ int num_items = io::detail::upper_bound_from_fstring(buf, arg_mark, fac, exceptions());
+ make_or_reuse_data(num_items);
+
+ // B: Now the real parsing of the format string :
+ num_items=0;
+ typename string_type::size_type i0=0, i1=0;
+ typename string_type::const_iterator it;
+ bool special_things=false;
+ int cur_item=0;
+ while( (i1=buf.find(arg_mark,i1)) != string_type::npos ) {
+ string_type & piece = (cur_item==0) ? prefix_ : items_[cur_item-1].appendix_;
+ if( buf[i1+1] == buf[i1] ) { // escaped mark, '%%'
+ io::detail::append_string(piece, buf, i0, i1+1);
+ i1+=2; i0=i1;
+ continue;
+ }
+ BOOST_ASSERT( static_cast<unsigned int>(cur_item) < items_.size() || cur_item==0);
+
+ if(i1!=i0) {
+ io::detail::append_string(piece, buf, i0, i1);
+ i0=i1;
+ }
+ ++i1;
+ it = buf.begin()+i1;
+ bool parse_ok = io::detail::parse_printf_directive(
+ it, buf.end(), &items_[cur_item], fac, i1, exceptions());
+ i1 = it - buf.begin();
+ if( ! parse_ok ) // the directive will be printed verbatim
+ continue;
+ i0=i1;
+ items_[cur_item].compute_states(); // process complex options, like zeropad, into params
+
+ int argN=items_[cur_item].argN_;
+ if(argN == format_item_t::argN_ignored)
+ continue;
+ if(argN ==format_item_t::argN_no_posit)
+ ordered_args=false;
+ else if(argN == format_item_t::argN_tabulation) special_things=true;
+ else if(argN > max_argN) max_argN = argN;
+ ++num_items;
+ ++cur_item;
+ } // loop on %'s
+ BOOST_ASSERT(cur_item == num_items);
- if( !ordered_args)
- {
- if(max_argN >= 0 ) // dont mix positional with non-positionnal directives
+ // store the final piece of string
{
- if(exceptions() & io::bad_format_string_bit)
- boost::throw_exception(io::bad_format_string());
- // else do nothing. => positionnal arguments are processed as non-positionnal
+ string_type & piece = (cur_item==0) ? prefix_ : items_[cur_item-1].appendix_;
+ io::detail::append_string(piece, buf, i0, buf.size());
+ }
+
+ if( !ordered_args) {
+ if(max_argN >= 0 ) { // dont mix positional with non-positionnal directives
+ if(exceptions() & io::bad_format_string_bit)
+ boost::throw_exception(io::bad_format_string(max_argN, 0));
+ // else do nothing. => positionnal arguments are processed as non-positionnal
+ }
+ // set things like it would have been with positional directives :
+ int non_ordered_items = 0;
+ for(int i=0; i< num_items; ++i)
+ if(items_[i].argN_ == format_item_t::argN_no_posit) {
+ items_[i].argN_ = non_ordered_items;
+ ++non_ordered_items;
+ }
+ max_argN = non_ordered_items-1;
}
- // set things like it would have been with positional directives :
- int non_ordered_items = 0;
- for(int i=0; i< num_items; ++i)
- if(items_[i].argN_ == format_item_t::argN_no_posit)
- {
- items_[i].argN_ = non_ordered_items;
- ++non_ordered_items;
- }
- max_argN = non_ordered_items-1;
- }
- // C: set some member data :
- items_.resize(num_items);
-
- if(special_things) style_ |= special_needs;
- num_args_ = max_argN + 1;
- if(ordered_args) style_ |= ordered;
- else style_ &= ~ordered;
-}
+ // C: set some member data :
+ items_.resize(num_items, format_item_t(io::detail::const_or_not(fac).widen( ' ')) );
+
+ if(special_things) style_ |= special_needs;
+ num_args_ = max_argN + 1;
+ if(ordered_args) style_ |= ordered;
+ else style_ &= ~ordered;
+ return *this;
+ }
} // namespace boost
projects / lyx.git / blobdiff