[1408] | 1 | /* -*- C++ -*- |
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[1435] | 2 | * lemon/bits/item_reader.h - Part of LEMON, a generic C++ optimization library |
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[1408] | 3 | * |
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| 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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| 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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[1415] | 17 | /// @defgroup item_io Item Readers and Writers |
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| 18 | /// @ingroup io_group |
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| 19 | /// \brief Item Readers and Writers |
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| 20 | /// |
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| 21 | /// The Input-Output classes can handle more data type by example |
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| 22 | /// as map or attribute value. Each of these should be written and |
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| 23 | /// read some way. The module make possible to do this. |
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| 24 | |
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| 25 | /// \ingroup item_io |
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[1408] | 26 | /// \file |
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| 27 | /// \brief Item reader bits for lemon input. |
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| 28 | |
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| 29 | #ifndef LEMON_BITS_ITEM_READER_H |
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| 30 | #define LEMON_BITS_ITEM_READER_H |
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| 31 | |
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| 32 | #include <iostream> |
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| 33 | #include <string> |
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| 34 | |
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| 35 | #include <vector> |
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| 36 | #include <deque> |
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| 37 | #include <list> |
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| 38 | #include <set> |
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| 39 | |
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| 40 | namespace lemon { |
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| 41 | |
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| 42 | template <typename Value> |
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| 43 | class DefaultReader; |
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| 44 | |
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[1415] | 45 | /// \ingroup item_io |
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[1408] | 46 | /// |
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| 47 | /// \brief Reader class for quoted strings. |
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| 48 | /// |
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| 49 | /// Reader class for quoted strings. It can process the escape |
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| 50 | /// sequences in the string. |
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| 51 | /// |
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| 52 | /// \author Balazs Dezso |
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| 53 | class QuotedStringReader { |
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| 54 | public: |
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| 55 | /// \brief The value type of reader. |
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| 56 | /// |
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| 57 | /// The value type of reader. |
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| 58 | typedef std::string Value; |
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| 59 | |
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| 60 | /// \brief Constructor for the reader. |
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| 61 | /// |
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| 62 | /// Constructor for the reader. If the given parameter is true |
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| 63 | /// the reader processes the escape sequences. |
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| 64 | QuotedStringReader(bool _escaped = true) |
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| 65 | : escaped(_escaped) {} |
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| 66 | |
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| 67 | /// \brief Reads a quoted string from the given stream. |
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| 68 | /// |
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| 69 | /// Reads a quoted string from the given stream. |
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| 70 | void read(std::istream& is, std::string& value) const { |
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| 71 | char c; |
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| 72 | value.clear(); |
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| 73 | is >> std::ws; |
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| 74 | if (!is.get(c) || c != '\"') |
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| 75 | throw DataFormatError("Quoted string format error"); |
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| 76 | while (is.get(c) && c != '\"') { |
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| 77 | if (escaped && c == '\\') { |
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| 78 | value += readEscape(is); |
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| 79 | } else { |
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| 80 | value += c; |
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| 81 | } |
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| 82 | } |
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| 83 | if (!is) throw DataFormatError("Quoted string format error"); |
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| 84 | } |
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| 85 | |
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| 86 | private: |
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| 87 | |
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| 88 | static char readEscape(std::istream& is) { |
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| 89 | char c; |
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| 90 | switch (is.get(c), c) { |
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| 91 | case '\\': |
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| 92 | return '\\'; |
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| 93 | case '\"': |
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| 94 | return '\"'; |
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| 95 | case '\'': |
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| 96 | return '\''; |
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| 97 | case '\?': |
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| 98 | return '\?'; |
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| 99 | case 'a': |
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| 100 | return '\a'; |
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| 101 | case 'b': |
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| 102 | return '\b'; |
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| 103 | case 'f': |
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| 104 | return '\f'; |
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| 105 | case 'n': |
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| 106 | return '\n'; |
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| 107 | case 'r': |
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| 108 | return '\r'; |
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| 109 | case 't': |
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| 110 | return '\t'; |
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| 111 | case 'v': |
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| 112 | return '\v'; |
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| 113 | case 'x': |
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| 114 | { |
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| 115 | int code; |
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| 116 | if (!is.get(c) || !isHex(c)) |
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| 117 | throw DataFormatError("Escape format error"); |
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| 118 | else if (code = valueHex(c), !is.get(c) || !isHex(c)) is.putback(c); |
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| 119 | else code = code * 16 + valueHex(c); |
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| 120 | return code; |
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| 121 | } |
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| 122 | default: |
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| 123 | { |
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| 124 | int code; |
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| 125 | if (!isOct(c)) |
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| 126 | throw DataFormatError("Escape format error"); |
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| 127 | else if (code = valueOct(c), !is.get(c) || !isOct(c)) |
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| 128 | is.putback(c); |
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| 129 | else if (code = code * 8 + valueOct(c), !is.get(c) || !isOct(c)) |
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| 130 | is.putback(c); |
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| 131 | else code = code * 8 + valueOct(c); |
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| 132 | return code; |
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| 133 | } |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | static bool isOct(char c) { |
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| 138 | return '0' <= c && c <='7'; |
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| 139 | } |
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| 140 | |
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| 141 | static int valueOct(char c) { |
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| 142 | return c - '0'; |
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| 143 | } |
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| 144 | |
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| 145 | static bool isHex(char c) { |
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| 146 | return ('0' <= c && c <= '9') || |
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| 147 | ('a' <= c && c <= 'z') || |
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| 148 | ('A' <= c && c <= 'Z'); |
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| 149 | } |
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| 150 | |
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| 151 | static int valueHex(char c) { |
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| 152 | if ('0' <= c && c <= '9') return c - '0'; |
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| 153 | if ('a' <= c && c <= 'z') return c - 'a' + 10; |
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| 154 | return c - 'A' + 10; |
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| 155 | } |
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| 156 | |
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| 157 | bool escaped; |
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| 158 | }; |
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| 159 | |
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[1415] | 160 | /// \ingroup item_io |
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[1408] | 161 | /// \brief Reader for standard containers. |
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| 162 | /// |
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| 163 | /// Reader for back insertable standard containers. The representation |
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| 164 | /// of the container is the values enumerated between an open and a |
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| 165 | /// close parse. |
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| 166 | /// |
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| 167 | /// \author Balazs Dezso |
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| 168 | template < |
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| 169 | typename _Container, |
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| 170 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
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| 171 | > |
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| 172 | class PushBackReader { |
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| 173 | public: |
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| 174 | typedef _Container Value; |
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| 175 | typedef _ItemReader ItemReader; |
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| 176 | |
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| 177 | private: |
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| 178 | |
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| 179 | ItemReader item_reader; |
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| 180 | |
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| 181 | public: |
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| 182 | |
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| 183 | /// \brief Reads the values into the container from the given stream. |
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| 184 | /// |
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| 185 | /// Reads the values into the container from the given stream. |
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| 186 | void read(std::istream& is, Value& value) const { |
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| 187 | char c; |
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| 188 | if (!(is >> c) || c != '(') |
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| 189 | throw DataFormatError("PushBackReader format error"); |
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| 190 | while (is >> c && c != ')') { |
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| 191 | is.putback(c); |
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| 192 | typename ItemReader::Value item; |
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| 193 | item_reader.read(is, item); |
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| 194 | value.push_back(item); |
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| 195 | } |
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| 196 | if (!is) throw DataFormatError("PushBackReader format error"); |
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| 197 | is.putback(c); |
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| 198 | } |
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| 199 | |
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| 200 | }; |
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| 201 | |
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[1415] | 202 | /// \ingroup item_io |
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[1408] | 203 | /// |
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| 204 | /// \brief Reader for standard containers. |
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| 205 | /// |
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| 206 | /// Reader for insertable standard containers. The representation |
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| 207 | /// of the container is the values enumerated between an open and a |
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| 208 | /// close parse. |
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| 209 | /// |
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| 210 | /// \author Balazs Dezso |
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| 211 | template < |
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| 212 | typename _Container, |
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| 213 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
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| 214 | > |
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| 215 | class InsertReader { |
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| 216 | public: |
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| 217 | typedef _Container Value; |
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| 218 | typedef _ItemReader ItemReader; |
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| 219 | |
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| 220 | private: |
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| 221 | |
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| 222 | ItemReader item_reader; |
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| 223 | |
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| 224 | public: |
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| 225 | |
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| 226 | /// \brief Reads the values into the container from the given stream. |
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| 227 | /// |
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| 228 | /// Reads the values into the container from the given stream. |
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| 229 | void read(std::istream& is, Value& value) const { |
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| 230 | char c; |
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| 231 | if (!(is >> c) || c != '(') |
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| 232 | throw DataFormatError("InsertReader format error"); |
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| 233 | while (is >> c && c != ')') { |
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| 234 | is.putback(c); |
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| 235 | typename ItemReader::Value item; |
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| 236 | item_reader.read(is, item); |
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| 237 | value.insert(item); |
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| 238 | } |
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| 239 | if (!is) throw DataFormatError("PushBackReader format error"); |
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| 240 | is.putback(c); |
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| 241 | } |
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| 242 | |
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| 243 | }; |
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| 244 | |
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[1415] | 245 | /// \ingroup item_io |
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[1408] | 246 | /// \brief Reader for parsed string. |
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| 247 | /// |
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| 248 | /// Reader for parsed strings. You can give the open and close |
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| 249 | /// parse characters. |
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| 250 | /// |
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| 251 | /// \author Balazs Dezso |
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| 252 | class ParsedStringReader { |
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| 253 | public: |
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| 254 | typedef std::string Value; |
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| 255 | |
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| 256 | /// \brief Constructor. |
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| 257 | /// |
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| 258 | /// Constructor for ParsedStringReader. You can give as parameter |
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| 259 | /// the open and close parse characters. |
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| 260 | ParsedStringReader(char _open = '(', char _close = ')') |
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| 261 | : open(_open), close(_close) {} |
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| 262 | |
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| 263 | |
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| 264 | /// \brief Reads the parsed string from the given stream. |
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| 265 | /// |
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| 266 | /// Reads the parsed string from the given stream. |
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| 267 | void read(std::istream& is, Value& value) const { |
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| 268 | char c; |
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| 269 | if (!(is >> c) || c != open) { |
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| 270 | throw DataFormatError("ParsedStringReader format error"); |
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| 271 | } |
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| 272 | value += c; |
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| 273 | int counter = 1; |
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| 274 | while (counter > 0 && is >> c) { |
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| 275 | if (c == close) { |
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| 276 | --counter; |
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| 277 | } else if (c == open) { |
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| 278 | ++counter; |
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| 279 | } |
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| 280 | value += c; |
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| 281 | } |
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| 282 | if (!is) { |
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| 283 | throw DataFormatError("ParsedStrinReader format error"); |
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| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | private: |
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| 288 | char open, close; |
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| 289 | |
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| 290 | }; |
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| 291 | |
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[1415] | 292 | /// \ingroup item_io |
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[1408] | 293 | /// \brief Reader for read the whole line. |
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| 294 | /// |
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| 295 | /// Reader for read the whole line. |
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| 296 | /// |
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| 297 | /// \author Balazs Dezso |
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| 298 | class LineReader { |
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| 299 | public: |
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| 300 | typedef std::string Value; |
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| 301 | |
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| 302 | /// \brief Constructor. |
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| 303 | /// |
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| 304 | /// Constructor for the LineReader. If the given parameter is |
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| 305 | /// true then the spaces before the first not space character are |
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| 306 | /// skipped. |
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| 307 | LineReader(bool _skipSpaces = true) : skipSpaces(_skipSpaces) {} |
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| 308 | |
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| 309 | /// \brief Reads the line from the given stream. |
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| 310 | /// |
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| 311 | /// Reads the line from the given stream. |
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| 312 | void read(std::istream& is, Value& value) { |
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| 313 | if (skipSpaces) is >> std::ws; |
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| 314 | if (!getline(is, value)) { |
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| 315 | throw DataFormatError("LineReader forma error"); |
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| 316 | } |
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| 317 | } |
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| 318 | private: |
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| 319 | bool skipSpaces; |
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| 320 | }; |
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| 321 | |
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[1415] | 322 | /// \ingroup item_io |
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[1408] | 323 | /// |
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| 324 | /// \brief The default item reader template class. |
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| 325 | /// |
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| 326 | /// The default item reader template class. If some section reader |
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| 327 | /// needs to read a value from a stream it will give the default way for it. |
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| 328 | /// |
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| 329 | /// \author Balazs Dezso |
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| 330 | template <typename _Value> |
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| 331 | class DefaultReader { |
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| 332 | public: |
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| 333 | /// The value type. |
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| 334 | typedef _Value Value; |
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| 335 | /// \brief Reads a value from the given stream. |
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| 336 | /// |
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| 337 | /// Reads a value from the given stream. |
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| 338 | void read(std::istream& is, Value& value) const { |
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| 339 | if (!(is >> value)) |
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| 340 | throw DataFormatError("DefaultReader format error"); |
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| 341 | } |
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| 342 | }; |
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| 343 | |
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[1427] | 344 | template <> |
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| 345 | class DefaultReader<std::string> { |
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| 346 | public: |
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| 347 | typedef std::string Value; |
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| 348 | |
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| 349 | void read(std::istream& is, Value& value) const { |
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| 350 | char c; |
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[1429] | 351 | if (!(is >> std::ws >> c)) return; |
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[1427] | 352 | is.putback(c); |
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| 353 | switch (c) { |
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| 354 | case '\"': |
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| 355 | QuotedStringReader().read(is, value); |
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| 356 | break; |
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| 357 | case '(': |
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| 358 | ParsedStringReader().read(is, value); |
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| 359 | break; |
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| 360 | default: |
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| 361 | is >> value; |
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| 362 | break; |
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| 363 | } |
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| 364 | } |
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| 365 | |
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| 366 | }; |
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| 367 | |
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[1408] | 368 | template <typename Item> |
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| 369 | class DefaultReader<std::vector<Item> > |
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| 370 | : public PushBackReader<std::vector<Item> > {}; |
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| 371 | |
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| 372 | template <typename Item> |
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| 373 | class DefaultReader<std::deque<Item> > |
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| 374 | : public PushBackReader<std::deque<Item> > {}; |
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| 375 | |
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| 376 | template <typename Item> |
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| 377 | class DefaultReader<std::list<Item> > |
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| 378 | : public PushBackReader<std::list<Item> > {}; |
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| 379 | |
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| 380 | template <typename Item> |
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| 381 | class DefaultReader<std::set<Item> > |
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| 382 | : public InsertReader<std::set<Item> > {}; |
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| 383 | |
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| 384 | template <typename Item> |
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| 385 | class DefaultReader<std::multiset<Item> > |
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| 386 | : public InsertReader<std::multiset<Item> > {}; |
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| 387 | |
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[1415] | 388 | /// \ingroup item_io |
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| 389 | /// |
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| 390 | /// \brief The default item reader for skipping a value in the stream. |
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| 391 | /// |
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| 392 | /// The default item reader for skipping a value in the stream. |
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| 393 | /// |
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| 394 | /// \author Balazs Dezso |
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[1427] | 395 | class DefaultSkipper : public DefaultReader<std::string> {}; |
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[1415] | 396 | |
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| 397 | /// \ingroup item_io |
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[1408] | 398 | /// \brief Standard ReaderTraits for the GraphReader class. |
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| 399 | /// |
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| 400 | /// Standard ReaderTraits for the GraphReader class. |
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| 401 | /// It defines standard reading method for all type of value. |
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| 402 | /// \author Balazs Dezso |
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| 403 | struct DefaultReaderTraits { |
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| 404 | |
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| 405 | template <typename _Value> |
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| 406 | struct Reader : DefaultReader<_Value> {}; |
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| 407 | |
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| 408 | typedef DefaultSkipper Skipper; |
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| 409 | |
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| 410 | }; |
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| 411 | |
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| 412 | } |
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| 413 | |
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| 414 | #endif |
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