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-// ----------------------------------------------------------------------------
-// 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>
-#include <boost/config.hpp>
-#include <boost/core/ignore_unused.hpp>
-
-namespace boost {
-namespace io {
-namespace detail {
-
-#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
- ignore_unused(fac);
- using namespace std;
- return isdigit(c) != 0;
-#endif
- }
-
- 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
- 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;
- }
-
- // auxiliary func called by parse_printf_directive
- // for centralising error handling
- // it either throws if user sets the corresponding flag, or does nothing.
- 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;
- char mssiz = 0;
-
- 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;
- }
- }
-
- // 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$d) or possibly width specification: %2d
- if(wrap_isdigit(fac, *start)) {
- int n;
- start = str2int(start, last, n, fac);
- if( start >= last ) {
- maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
- return false;
- }
-
- // %N% case : this is already the end of the directive
- if( *start == const_or_not(fac).widen( '%') ) {
- fpar->argN_ = n-1;
- ++start;
- if( in_brackets)
- maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
- return true;
- }
-
- if ( *start== const_or_not(fac).widen( '$') ) {
- fpar->argN_ = n-1;
- ++start;
- }
- else {
- // non-positional directive
- fpar->fmtstate_.width_ = n;
- fpar->argN_ = format_item_t::argN_no_posit;
- goto parse_precision;
- }
- }
-
- parse_flags:
- // handle flags
- while (start != last) { // as long as char is one of + - = _ # 0 or ' '
- switch ( wrap_narrow(fac, *start, 0)) {
- case '\'':
- break; // no effect yet. (painful to implement)
- 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;
- }
-
- // first skip 'asterisk fields' : * or num (length)
- parse_width:
- if(*start == const_or_not(fac).widen( '*') )
- ++start;
- else 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;
- else if(start != last && wrap_isdigit(fac, *start)) {
- start = str2int(start, last, fpar->fmtstate_.precision_, fac);
- precision_set = true;
- }
- else
- fpar->fmtstate_.precision_ =0;
- }
-
- // argument type modifiers
- while (start != last) {
- switch (wrap_narrow(fac, *start, 0)) {
- case 'h':
- case 'l':
- case 'j':
- case 'z':
- case 'L':
- // boost::format ignores argument type modifiers as it relies on
- // the type of the argument fed into it by operator %
- break;
-
- // Note that the ptrdiff_t argument type 't' from C++11 is not honored
- // because it was already in use as the tabulation specifier in boost::format
- // case 't':
-
- // Microsoft extensions:
- // https://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx
-
- case 'w':
- break;
- case 'I':
- mssiz = 'I';
- break;
- case '3':
- if (mssiz != 'I') {
- maybe_throw_exception(exceptions, start - start0 + offset, fstring_size);
- return true;
- }
- mssiz = '3';
- break;
- case '2':
- if (mssiz != '3') {
- maybe_throw_exception(exceptions, start - start0 + offset, fstring_size);
- return true;
- }
- mssiz = 0x00;
- break;
- case '6':
- if (mssiz != 'I') {
- maybe_throw_exception(exceptions, start - start0 + offset, fstring_size);
- return true;
- }
- mssiz = '6';
- break;
- case '4':
- if (mssiz != '6') {
- maybe_throw_exception(exceptions, start - start0 + offset, fstring_size);
- return true;
- }
- mssiz = 0x00;
- break;
- default:
- if (mssiz && mssiz == 'I') {
- mssiz = 0;
- }
- goto parse_conversion_specification;
- }
- ++start;
- } // loop on argument type modifiers to pick up 'hh', 'll', and the more complex microsoft ones
-
- parse_conversion_specification:
- if (start >= last || mssiz) {
- maybe_throw_exception(exceptions, start - start0 + offset, fstring_size);
- return true;
- }
-
- if( in_brackets && *start== const_or_not(fac).widen( '|') ) {
- ++start;
- return true;
- }
-
- // The default flags are "dec" and "skipws"
- // so if changing the base, need to unset basefield first
-
- switch (wrap_narrow(fac, *start, 0))
- {
- // Boolean
- case 'b':
- fpar->fmtstate_.flags_ |= std::ios_base::boolalpha;
- break;
-
- // Decimal
- case 'u':
- case 'd':
- case 'i':
- // Defaults are sufficient
- break;
-
- // Hex
- case 'X':
- fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
- BOOST_FALLTHROUGH;
- case 'x':
- case 'p': // pointer => set hex.
- fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
- fpar->fmtstate_.flags_ |= std::ios_base::hex;
- break;
-
- // Octal
- case 'o':
- fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
- fpar->fmtstate_.flags_ |= std::ios_base::oct;
- break;
-
- // Floating
- case 'A':
- fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
- BOOST_FALLTHROUGH;
- case 'a':
- fpar->fmtstate_.flags_ &= ~std::ios_base::basefield;
- fpar->fmtstate_.flags_ |= std::ios_base::fixed;
- fpar->fmtstate_.flags_ |= std::ios_base::scientific;
- break;
- case 'E':
- fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
- BOOST_FALLTHROUGH;
- case 'e':
- fpar->fmtstate_.flags_ |= std::ios_base::scientific;
- break;
- case 'F':
- fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
- BOOST_FALLTHROUGH;
- case 'f':
- fpar->fmtstate_.flags_ |= std::ios_base::fixed;
- break;
- case 'G':
- fpar->fmtstate_.flags_ |= std::ios_base::uppercase;
- BOOST_FALLTHROUGH;
- case 'g':
- // default flags are correct here
- break;
-
- // Tabulation (a boost::format extension)
- case 'T':
- ++start;
- if( start >= last) {
- maybe_throw_exception(exceptions, start-start0+offset, fstring_size);
- return false;
- } else {
- fpar->fmtstate_.fill_ = *start;
- }
- fpar->pad_scheme_ |= format_item_t::tabulation;
- fpar->argN_ = format_item_t::argN_tabulation;
- break;
- 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;
-
- // Character
- case 'C':
- case 'c':
- fpar->truncate_ = 1;
- break;
-
- // String
- 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;
-
- // %n is insecure and ignored by boost::format
- 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()
-
- 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;
- }
-
- ++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;
- }
- template<class String> inline
- void append_string(String& dst, const String& src,
- const typename String::size_type beg,
- const typename String::size_type end) {
- dst.append(src.begin()+beg, src.begin()+end);
- }
-
-} // detail namespace
-} // io namespace
-
-
-
-// -----------------------------------------------
-// format :: parse(..)
-
- 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);
-
- // store the final piece of string
- {
- 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(static_cast<std::size_t>(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;
- }
-
- // 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
-
-
-#endif // BOOST_FORMAT_PARSING_HPP
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