aboutsummaryrefslogtreecommitdiff
path: root/odb/sql-lexer.hxx
blob: fd24df36ac52718afc75731080743cefcddcba62 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// file      : odb/sql-lexer.hxx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license   : GNU GPL v3; see accompanying LICENSE file

#ifndef ODB_SQL_LEXER_HXX
#define ODB_SQL_LEXER_HXX

#include <string>
#include <locale>
#include <cstddef> // std::size_t
#include <sstream>

#include <odb/sql-token.hxx>

class sql_lexer
{
public:
  sql_lexer ();
  sql_lexer (std::string const& sql);

  void lex (std::string const& sql);

  struct invalid_input
  {
    invalid_input (std::size_t l, std::size_t c, std::string const& m)
        : line (l), column (c), message (m)
    {
    }

    std::size_t line;
    std::size_t column;
    std::string const message;
  };

  sql_token
  next ();

protected:
  class xchar
  {
  public:
    typedef std::char_traits<char> traits_type;
    typedef traits_type::int_type int_type;
    typedef traits_type::char_type char_type;

    xchar (int_type v, std::size_t l, std::size_t c);

    operator char_type () const;

    int_type
    value () const;

    std::size_t
    line () const;

    std::size_t
    column () const;

  private:
    int_type v_;
    std::size_t l_;
    std::size_t c_;
  };

  xchar
  peek ();

  xchar
  get ();

  void
  unget (xchar);

protected:
  void
  skip_spaces ();

  sql_token
  identifier (xchar);

  sql_token
  int_literal (xchar,
               bool neg = false,
               std::size_t ml = 0,
               std::size_t mc = 0);

  sql_token
  string_literal (xchar);

protected:
  bool
  is_alpha (char c) const;

  bool
  is_oct_digit (char c) const;

  bool
  is_dec_digit (char c) const;

  bool
  is_hex_digit (char c) const;

  bool
  is_alnum (char c) const;

  bool
  is_space (char c) const;

  bool
  is_eos (xchar const& c) const;

  char
  to_upper (char c) const;

private:
  std::locale loc_;
  std::istringstream is_;
  std::size_t l_;
  std::size_t c_;

  bool eos_;
  bool include_;

  xchar buf_;
  bool unget_;
};

#include <odb/sql-lexer.ixx>

#endif // ODB_SQL_LEXER_HXX