[857] | 1 | /*=============================================================================
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| 2 | Boost.Wave: A Standard compliant C++ preprocessor library
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| 3 |
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| 4 | http://www.boost.org/
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| 5 |
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| 6 | Copyright (c) 2001-2005 Hartmut Kaiser. Distributed under the Boost
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| 7 | Software License, Version 1.0. (See accompanying file
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| 8 | LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 9 | =============================================================================*/
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| 10 |
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| 11 | #if !defined(CPP_CHLIT_GRAMMAR_HPP_9527D349_6592_449A_A409_42A001E6C64C_INCLUDED)
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| 12 | #define CPP_CHLIT_GRAMMAR_HPP_9527D349_6592_449A_A409_42A001E6C64C_INCLUDED
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| 13 |
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| 14 | #include <limits> // sid::numeric_limits
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| 15 |
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| 16 | #include <boost/static_assert.hpp>
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| 17 | #include <boost/cstdint.hpp>
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| 18 |
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| 19 | #include <boost/spirit/core.hpp>
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| 20 | #include <boost/spirit/attribute/closure.hpp>
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| 21 | #include <boost/spirit/dynamic/if.hpp>
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| 22 |
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| 23 | #include <boost/spirit/phoenix/operators.hpp>
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| 24 | #include <boost/spirit/phoenix/primitives.hpp>
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| 25 | #include <boost/spirit/phoenix/statements.hpp>
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| 26 | #include <boost/spirit/phoenix/functions.hpp>
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| 27 |
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| 28 | #include <boost/wave/wave_config.hpp>
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| 29 | #include <boost/wave/cpp_exceptions.hpp>
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| 30 | #include <boost/wave/grammars/cpp_literal_grammar_gen.hpp>
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| 31 |
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| 32 | ///////////////////////////////////////////////////////////////////////////////
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| 33 | //
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| 34 | // Reusable grammar to parse a C++ style character literal
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| 35 | //
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| 36 | ///////////////////////////////////////////////////////////////////////////////
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| 37 | namespace boost {
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| 38 | namespace wave {
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| 39 | namespace grammars {
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| 40 |
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| 41 | namespace closures {
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| 42 |
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| 43 | struct chlit_closure
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| 44 | : boost::spirit::closure<chlit_closure, boost::uint32_t, bool>
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| 45 | {
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| 46 | member1 value;
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| 47 | member2 long_lit;
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| 48 | };
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| 49 | }
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| 50 |
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| 51 | namespace impl {
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| 52 |
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| 53 | ///////////////////////////////////////////////////////////////////////////////
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| 54 | //
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| 55 | // compose a multibyte character literal
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| 56 | //
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| 57 | ///////////////////////////////////////////////////////////////////////////////
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| 58 | struct compose_character_literal {
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| 59 |
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| 60 | template <typename ResultT, typename A1, typename A2, typename A3>
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| 61 | struct result {
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| 62 |
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| 63 | typedef void type;
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| 64 | };
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| 65 |
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| 66 | void
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| 67 | operator()(boost::uint32_t& value, bool long_lit, bool& overflow,
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| 68 | boost::uint32_t character) const
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| 69 | {
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| 70 | // The following assumes that wchar_t is max. 32 Bit
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| 71 | BOOST_STATIC_ASSERT(sizeof(wchar_t) <= 4);
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| 72 |
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| 73 | static boost::uint32_t masks[] = {
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| 74 | 0x000000ff, 0x0000ffff, 0x00ffffff, 0xffffffff
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| 75 | };
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| 76 | static boost::uint32_t overflow_masks[] = {
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| 77 | 0xff000000, 0xffff0000, 0xffffff00, 0xffffffff
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| 78 | };
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| 79 |
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| 80 | if (long_lit) {
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| 81 | // make sure no overflow will occur below
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| 82 | if ((value & overflow_masks[sizeof(wchar_t)-1]) != 0) {
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| 83 | overflow |= true;
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| 84 | }
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| 85 | else {
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| 86 | // calculate the new value (avoiding a warning regarding
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| 87 | // shifting count >= size of the type)
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| 88 | value <<= 8 * (sizeof(wchar_t)-1);
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| 89 | value <<= 8;
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| 90 | value |= character & masks[sizeof(wchar_t)-1];
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| 91 | }
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| 92 | }
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| 93 | else {
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| 94 | // make sure no overflow will occur below
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| 95 | if ((value & overflow_masks[sizeof(char)-1]) != 0) {
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| 96 | overflow |= true;
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| 97 | }
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| 98 | else {
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| 99 | // calculate the new value
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| 100 | value <<= 8 * sizeof(char);
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| 101 | value |= character & masks[sizeof(char)-1];
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| 102 | }
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| 103 | }
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| 104 | }
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| 105 | };
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| 106 | phoenix::function<compose_character_literal> const compose;
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| 107 |
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| 108 | } // namespace impl
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| 109 |
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| 110 | ///////////////////////////////////////////////////////////////////////////////
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| 111 | // define, whether the rule's should generate some debug output
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| 112 | #define TRACE_CHLIT_GRAMMAR \
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| 113 | bool(BOOST_SPIRIT_DEBUG_FLAGS_CPP & BOOST_SPIRIT_DEBUG_FLAGS_CHLIT_GRAMMAR) \
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| 114 | /**/
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| 115 |
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| 116 | struct chlit_grammar :
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| 117 | public boost::spirit::grammar<chlit_grammar,
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| 118 | closures::chlit_closure::context_t>
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| 119 | {
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| 120 | chlit_grammar()
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| 121 | : overflow(false)
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| 122 | {
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| 123 | BOOST_SPIRIT_DEBUG_TRACE_GRAMMAR_NAME(*this, "chlit_grammar",
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| 124 | TRACE_CHLIT_GRAMMAR);
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| 125 | }
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| 126 |
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| 127 | template <typename ScannerT>
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| 128 | struct definition
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| 129 | {
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| 130 | typedef
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| 131 | boost::spirit::rule<ScannerT, closures::chlit_closure::context_t>
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| 132 | rule_t;
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| 133 |
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| 134 | rule_t ch_lit;
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| 135 |
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| 136 | definition(chlit_grammar const &self)
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| 137 | {
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| 138 | using namespace boost::spirit;
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| 139 | using namespace phoenix;
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| 140 |
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| 141 | // special parsers for '\x..' and L'\x....'
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| 142 | typedef uint_parser<
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| 143 | unsigned int, 16, 1, 2 * sizeof(char)
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| 144 | > hex_char_parser_type;
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| 145 | typedef uint_parser<
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| 146 | unsigned int, 16, 1, 2 * sizeof(wchar_t)
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| 147 | > hex_wchar_parser_type;
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| 148 |
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| 149 | // the rule for a character literal
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| 150 | ch_lit
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| 151 | = eps_p[self.value = val(0), self.long_lit = val(false)]
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| 152 | >> !ch_p('L')[self.long_lit = val(true)]
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| 153 | >> ch_p('\'')
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| 154 | >> +( (
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| 155 | ch_p('\\')
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| 156 | >> ( ch_p('a') // BEL
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| 157 | [
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| 158 | impl::compose(self.value, self.long_lit,
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| 159 | var(self.overflow), val(0x07))
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| 160 | ]
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| 161 | | ch_p('b') // BS
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| 162 | [
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| 163 | impl::compose(self.value, self.long_lit,
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| 164 | var(self.overflow), val(0x08))
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| 165 | ]
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| 166 | | ch_p('t') // HT
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| 167 | [
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| 168 | impl::compose(self.value, self.long_lit,
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| 169 | var(self.overflow), val(0x09))
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| 170 | ]
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| 171 | | ch_p('n') // NL
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| 172 | [
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| 173 | impl::compose(self.value, self.long_lit,
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| 174 | var(self.overflow), val(0x0a))
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| 175 | ]
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| 176 | | ch_p('v') // VT
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| 177 | [
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| 178 | impl::compose(self.value, self.long_lit,
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| 179 | var(self.overflow), val(0x0b))
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| 180 | ]
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| 181 | | ch_p('f') // FF
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| 182 | [
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| 183 | impl::compose(self.value, self.long_lit,
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| 184 | var(self.overflow), val(0x0c))
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| 185 | ]
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| 186 | | ch_p('r') // CR
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| 187 | [
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| 188 | impl::compose(self.value, self.long_lit,
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| 189 | var(self.overflow), val(0x0d))
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| 190 | ]
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| 191 | | ch_p('?')
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| 192 | [
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| 193 | impl::compose(self.value, self.long_lit,
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| 194 | var(self.overflow), val('?'))
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| 195 | ]
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| 196 | | ch_p('\'')
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| 197 | [
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| 198 | impl::compose(self.value, self.long_lit,
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| 199 | var(self.overflow), val('\''))
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| 200 | ]
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| 201 | | ch_p('\"')
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| 202 | [
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| 203 | impl::compose(self.value, self.long_lit,
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| 204 | var(self.overflow), val('\"'))
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| 205 | ]
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| 206 | | ch_p('\\')
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| 207 | [
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| 208 | impl::compose(self.value, self.long_lit,
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| 209 | var(self.overflow), val('\\'))
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| 210 | ]
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| 211 | | ch_p('x')
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| 212 | >> if_p(self.long_lit)
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| 213 | [
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| 214 | hex_wchar_parser_type()
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| 215 | [
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| 216 | impl::compose(self.value, self.long_lit,
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| 217 | var(self.overflow), arg1)
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| 218 | ]
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| 219 | ]
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| 220 | .else_p
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| 221 | [
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| 222 | hex_char_parser_type()
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| 223 | [
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| 224 | impl::compose(self.value, self.long_lit,
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| 225 | var(self.overflow), arg1)
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| 226 | ]
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| 227 | ]
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| 228 | | ch_p('u')
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| 229 | >> uint_parser<unsigned int, 16, 4, 4>()
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| 230 | [
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| 231 | impl::compose(self.value, self.long_lit,
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| 232 | var(self.overflow), arg1)
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| 233 | ]
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| 234 | | ch_p('U')
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| 235 | >> uint_parser<unsigned int, 16, 8, 8>()
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| 236 | [
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| 237 | impl::compose(self.value, self.long_lit,
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| 238 | var(self.overflow), arg1)
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| 239 | ]
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| 240 | | uint_parser<unsigned int, 8, 1, 3>()
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| 241 | [
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| 242 | impl::compose(self.value, self.long_lit,
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| 243 | var(self.overflow), arg1)
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| 244 | ]
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| 245 | )
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| 246 | )
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| 247 | | ~eps_p(ch_p('\'')) >> anychar_p
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| 248 | [
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| 249 | impl::compose(self.value, self.long_lit,
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| 250 | var(self.overflow), arg1)
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| 251 | ]
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| 252 | )
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| 253 | >> ch_p('\'')
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| 254 | ;
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| 255 |
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| 256 | BOOST_SPIRIT_DEBUG_TRACE_RULE(ch_lit, TRACE_CHLIT_GRAMMAR);
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| 257 | }
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| 258 |
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| 259 | // start rule of this grammar
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| 260 | rule_t const& start() const
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| 261 | { return ch_lit; }
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| 262 | };
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| 263 |
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| 264 | // flag signaling integer overflow during value composition
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| 265 | mutable bool overflow;
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| 266 | };
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| 267 |
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| 268 | #undef TRACE_CHLIT_GRAMMAR
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| 269 |
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| 270 | ///////////////////////////////////////////////////////////////////////////////
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| 271 | //
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| 272 | // The following function is defined here, to allow the separation of
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| 273 | // the compilation of the intlit_grammap from the function using it.
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| 274 | //
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| 275 | ///////////////////////////////////////////////////////////////////////////////
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| 276 |
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| 277 | #if BOOST_WAVE_SEPARATE_GRAMMAR_INSTANTIATION != 0
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| 278 | #define BOOST_WAVE_CHLITGRAMMAR_GEN_INLINE
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| 279 | #else
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| 280 | #define BOOST_WAVE_CHLITGRAMMAR_GEN_INLINE inline
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| 281 | #endif
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| 282 |
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| 283 | template <typename TokenT>
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| 284 | BOOST_WAVE_CHLITGRAMMAR_GEN_INLINE
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| 285 | unsigned int
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| 286 | chlit_grammar_gen<TokenT>::evaluate(TokenT const &token)
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| 287 | {
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| 288 | using namespace boost::spirit;
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| 289 |
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| 290 | chlit_grammar g;
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| 291 | boost::uint32_t result = 0;
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| 292 | typename TokenT::string_type const &token_val = token.get_value();
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| 293 | parse_info<typename TokenT::string_type::const_iterator> hit =
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| 294 | parse(token_val.begin(), token_val.end(), g[spirit_assign_actor(result)]);
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| 295 |
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| 296 | if (!hit.hit) {
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| 297 | BOOST_WAVE_THROW(preprocess_exception, ill_formed_character_literal,
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| 298 | token_val.c_str(), token.get_position());
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| 299 | }
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| 300 | else {
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| 301 | // range check
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| 302 | if ('L' == token_val[0]) {
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| 303 | // recognised wide character
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| 304 | if (g.overflow ||
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| 305 | result > (unsigned long)(std::numeric_limits<wchar_t>::max)())
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| 306 | {
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| 307 | // out of range
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| 308 | BOOST_WAVE_THROW(preprocess_exception,
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| 309 | character_literal_out_of_range,
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| 310 | token_val.c_str(), token.get_position());
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| 311 | }
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| 312 | }
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| 313 | else {
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| 314 | // recognised narrow ('normal') character
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| 315 | if (g.overflow ||
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| 316 | result > (unsigned long)(std::numeric_limits<unsigned char>::max)())
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| 317 | {
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| 318 | // out of range
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| 319 | BOOST_WAVE_THROW(preprocess_exception,
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| 320 | character_literal_out_of_range,
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| 321 | token_val.c_str(), token.get_position());
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| 322 | }
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| 323 | }
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| 324 | }
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| 325 | return result;
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| 326 | }
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| 327 |
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| 328 | #undef BOOST_WAVE_CHLITGRAMMAR_GEN_INLINE
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| 329 |
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| 330 | ///////////////////////////////////////////////////////////////////////////////
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| 331 | } // namespace grammars
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| 332 | } // namespace wave
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| 333 | } // namespace boost
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| 334 |
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| 335 | #endif // !defined(CPP_CHLIT_GRAMMAR_HPP_9527D349_6592_449A_A409_42A001E6C64C_INCLUDED)
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