1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2006 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | /// \ingroup item_io |
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20 | /// \file |
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21 | /// \brief Item reader bits for lemon input. |
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22 | |
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23 | #ifndef LEMON_BITS_ITEM_READER_H |
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24 | #define LEMON_BITS_ITEM_READER_H |
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25 | |
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26 | #include <iostream> |
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27 | #include <string> |
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28 | |
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29 | #include <vector> |
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30 | #include <deque> |
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31 | #include <list> |
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32 | #include <set> |
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33 | |
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34 | namespace lemon { |
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35 | |
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36 | template <typename Value> |
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37 | class DefaultReader; |
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38 | |
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39 | /// \ingroup item_io |
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40 | /// |
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41 | /// \brief Reader class for unformatted strings. |
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42 | /// |
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43 | /// Reader class for unformatted strings. This class want to be |
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44 | /// a general reader type which can read the most |
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45 | /// |
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46 | /// \author Balazs Dezso |
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47 | class UnformattedReader { |
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48 | public: |
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49 | /// \brief The value type of reader. |
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50 | /// |
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51 | /// The value type of reader. |
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52 | typedef std::string Value; |
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53 | |
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54 | /// \brief Constructor for the reader. |
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55 | /// |
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56 | /// Constructor for the reader. |
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57 | UnformattedReader() {} |
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58 | |
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59 | /// \brief Reads an unformatted string from the given stream. |
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60 | /// |
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61 | /// Reads an unformatted string from the given stream. |
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62 | void read(std::istream& is, std::string& value) const { |
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63 | char c; |
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64 | value.clear(); |
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65 | is >> std::ws; |
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66 | while (is.get(c) && !whiteSpace(c)) { |
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67 | processChar(c, is, value); |
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68 | } |
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69 | } |
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70 | |
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71 | private: |
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72 | |
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73 | void processChar(char c, std::istream& is, Value& value) const { |
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74 | switch (c) { |
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75 | case '(': |
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76 | is.putback(c); |
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77 | readParsed('(', ')', is, value); |
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78 | break; |
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79 | case '[': |
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80 | is.putback(c); |
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81 | readParsed('[', ']', is, value); |
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82 | break; |
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83 | case '{': |
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84 | is.putback(c); |
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85 | readParsed('{', '}', is, value); |
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86 | break; |
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87 | case '/': |
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88 | is.putback(c); |
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89 | readParsed('/', '/', is, value); |
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90 | break; |
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91 | case '\"': |
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92 | is.putback(c); |
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93 | readQuoted('\"', is, value); |
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94 | break; |
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95 | case '\'': |
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96 | is.putback(c); |
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97 | readQuoted('\'', is, value); |
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98 | break; |
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99 | default: |
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100 | value += c; |
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101 | break; |
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102 | } |
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103 | } |
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104 | |
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105 | void readParsed(char open, char close, |
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106 | std::istream& is, Value& value) const { |
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107 | char c; |
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108 | if (!is.get(c) || c != open) |
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109 | throw DataFormatError("Unformatted string format error"); |
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110 | value += c; |
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111 | while (is.get(c) && c != close) { |
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112 | processChar(c, is, value); |
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113 | } |
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114 | if (!is) |
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115 | throw DataFormatError("Unformatted string format error"); |
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116 | value += c; |
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117 | } |
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118 | |
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119 | void readQuoted(char quote, std::istream& is, Value& value) const { |
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120 | char c; |
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121 | bool esc = false; |
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122 | if (!is.get(c) || c != quote) |
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123 | throw DataFormatError("Unformatted string format error"); |
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124 | value += c; |
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125 | while (is.get(c) && (c != quote || esc)) { |
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126 | if (c == '\\') esc = !esc; |
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127 | else esc = false; |
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128 | value += c; |
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129 | } |
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130 | if (!is) |
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131 | throw DataFormatError("Unformatted string format error"); |
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132 | value += c; |
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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 whiteSpace(char c) { |
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138 | return c == ' ' || c == '\t' || c == '\v' || |
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139 | c == '\n' || c == '\r' || c == '\f'; |
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140 | } |
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141 | |
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142 | |
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143 | }; |
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144 | |
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145 | /// \ingroup item_io |
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146 | /// |
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147 | /// \brief Reader class for quoted strings. |
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148 | /// |
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149 | /// Reader class for quoted strings. It can process the escape |
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150 | /// sequences in the string. |
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151 | /// |
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152 | /// \author Balazs Dezso |
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153 | class QuotedStringReader { |
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154 | friend class QuotedCharReader; |
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155 | public: |
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156 | /// \brief The value type of reader. |
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157 | /// |
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158 | /// The value type of reader. |
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159 | typedef std::string Value; |
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160 | |
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161 | /// \brief Constructor for the reader. |
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162 | /// |
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163 | /// Constructor for the reader. If the given parameter is true |
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164 | /// the reader processes the escape sequences. |
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165 | QuotedStringReader(bool _escaped = true) |
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166 | : escaped(_escaped) {} |
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167 | |
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168 | /// \brief Reads a quoted string from the given stream. |
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169 | /// |
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170 | /// Reads a quoted string from the given stream. |
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171 | void read(std::istream& is, std::string& value) const { |
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172 | char c; |
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173 | value.clear(); |
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174 | is >> std::ws; |
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175 | if (!is.get(c) || c != '\"') |
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176 | throw DataFormatError("Quoted format error"); |
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177 | while (is.get(c) && c != '\"') { |
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178 | if (escaped && c == '\\') { |
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179 | value += readEscape(is); |
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180 | } else { |
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181 | value += c; |
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182 | } |
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183 | } |
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184 | if (!is) throw DataFormatError("Quoted format error"); |
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185 | } |
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186 | |
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187 | private: |
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188 | |
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189 | static char readEscape(std::istream& is) { |
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190 | char c; |
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191 | switch (is.get(c), c) { |
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192 | case '\\': |
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193 | return '\\'; |
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194 | case '\"': |
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195 | return '\"'; |
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196 | case '\'': |
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197 | return '\''; |
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198 | case '\?': |
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199 | return '\?'; |
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200 | case 'a': |
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201 | return '\a'; |
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202 | case 'b': |
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203 | return '\b'; |
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204 | case 'f': |
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205 | return '\f'; |
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206 | case 'n': |
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207 | return '\n'; |
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208 | case 'r': |
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209 | return '\r'; |
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210 | case 't': |
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211 | return '\t'; |
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212 | case 'v': |
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213 | return '\v'; |
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214 | case 'x': |
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215 | { |
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216 | int code; |
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217 | if (!is.get(c) || !isHex(c)) |
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218 | throw DataFormatError("Escape format error"); |
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219 | else if (code = valueHex(c), !is.get(c) || !isHex(c)) is.putback(c); |
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220 | else code = code * 16 + valueHex(c); |
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221 | return code; |
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222 | } |
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223 | default: |
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224 | { |
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225 | int code; |
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226 | if (!isOct(c)) |
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227 | throw DataFormatError("Escape format error"); |
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228 | else if (code = valueOct(c), !is.get(c) || !isOct(c)) |
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229 | is.putback(c); |
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230 | else if (code = code * 8 + valueOct(c), !is.get(c) || !isOct(c)) |
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231 | is.putback(c); |
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232 | else code = code * 8 + valueOct(c); |
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233 | return code; |
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234 | } |
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235 | } |
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236 | } |
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237 | |
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238 | static bool isOct(char c) { |
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239 | return '0' <= c && c <='7'; |
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240 | } |
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241 | |
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242 | static int valueOct(char c) { |
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243 | return c - '0'; |
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244 | } |
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245 | |
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246 | static bool isHex(char c) { |
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247 | return ('0' <= c && c <= '9') || |
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248 | ('a' <= c && c <= 'z') || |
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249 | ('A' <= c && c <= 'Z'); |
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250 | } |
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251 | |
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252 | static int valueHex(char c) { |
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253 | if ('0' <= c && c <= '9') return c - '0'; |
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254 | if ('a' <= c && c <= 'z') return c - 'a' + 10; |
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255 | return c - 'A' + 10; |
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256 | } |
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257 | |
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258 | bool escaped; |
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259 | }; |
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260 | |
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261 | /// \ingroup item_io |
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262 | /// |
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263 | /// \brief Reader class for quoted strings. |
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264 | /// |
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265 | /// Reader class for quoted strings. It can process the escape |
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266 | /// sequences in the string. |
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267 | /// |
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268 | /// \author Balazs Dezso |
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269 | class QuotedCharReader { |
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270 | public: |
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271 | /// \brief The value type of reader. |
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272 | /// |
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273 | /// The value type of reader. |
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274 | typedef char Value; |
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275 | |
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276 | /// \brief Constructor for the reader. |
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277 | /// |
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278 | /// Constructor for the reader. If the given parameter is true |
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279 | /// the reader processes the escape sequences. |
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280 | QuotedCharReader(bool _escaped = true) |
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281 | : escaped(_escaped) {} |
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282 | |
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283 | /// \brief Reads a quoted string from the given stream. |
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284 | /// |
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285 | /// Reads a quoted string from the given stream. |
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286 | void read(std::istream& is, char& value) const { |
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287 | char c; |
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288 | is >> std::ws; |
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289 | if (!is.get(c) || c != '\'') |
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290 | throw DataFormatError("Quoted format error"); |
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291 | if (!is.get(c)) |
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292 | throw DataFormatError("Quoted format error"); |
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293 | if (escaped && c == '\\') { |
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294 | value = QuotedStringReader::readEscape(is); |
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295 | } else { |
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296 | value = c; |
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297 | } |
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298 | if (!is.get(c) || c != '\'') |
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299 | throw DataFormatError("Quoted format error"); |
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300 | } |
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301 | |
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302 | private: |
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303 | bool escaped; |
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304 | }; |
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305 | |
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306 | /// \ingroup item_io |
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307 | /// \brief Reader for standard containers. |
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308 | /// |
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309 | /// Reader for back insertable standard containers. The representation |
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310 | /// of the container is the values enumerated between an open and a |
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311 | /// close parse. |
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312 | /// |
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313 | /// \author Balazs Dezso |
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314 | template < |
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315 | typename _Container, |
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316 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
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317 | > |
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318 | class PushBackReader { |
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319 | public: |
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320 | typedef _Container Value; |
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321 | typedef _ItemReader ItemReader; |
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322 | |
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323 | private: |
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324 | |
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325 | ItemReader item_reader; |
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326 | |
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327 | public: |
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328 | |
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329 | /// \brief Constructor for InsertReader |
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330 | /// |
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331 | /// Constructor for InsertReader |
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332 | PushBackReader(const ItemReader& _item_reader = ItemReader()) |
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333 | : item_reader(_item_reader) {} |
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334 | |
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335 | /// \brief Reads the values into the container from the given stream. |
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336 | /// |
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337 | /// Reads the values into the container from the given stream. |
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338 | void read(std::istream& is, Value& value) const { |
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339 | char c; |
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340 | if (!(is >> c) || c != '(') |
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341 | throw DataFormatError("PushBackReader format error"); |
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342 | while (is >> c && c != ')') { |
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343 | is.putback(c); |
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344 | typename ItemReader::Value item; |
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345 | item_reader.read(is, item); |
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346 | value.push_back(item); |
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347 | } |
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348 | if (!is) throw DataFormatError("PushBackReader format error"); |
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349 | } |
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350 | |
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351 | }; |
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352 | |
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353 | /// \ingroup item_io |
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354 | /// |
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355 | /// \brief Reader for standard containers. |
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356 | /// |
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357 | /// Reader for insertable standard containers. The representation |
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358 | /// of the container is the values enumerated between an open and a |
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359 | /// close parse. |
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360 | /// |
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361 | /// \author Balazs Dezso |
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362 | template < |
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363 | typename _Container, |
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364 | typename _ItemReader = DefaultReader<typename _Container::value_type> |
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365 | > |
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366 | class InsertReader { |
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367 | public: |
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368 | typedef _Container Value; |
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369 | typedef _ItemReader ItemReader; |
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370 | |
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371 | private: |
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372 | |
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373 | ItemReader item_reader; |
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374 | |
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375 | public: |
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376 | |
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377 | /// \brief Constructor for InsertReader |
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378 | /// |
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379 | /// Constructor for InsertReader |
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380 | InsertReader(const ItemReader& _item_reader = ItemReader()) |
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381 | : item_reader(_item_reader) {} |
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382 | |
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383 | /// \brief Reads the values into the container from the given stream. |
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384 | /// |
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385 | /// Reads the values into the container from the given stream. |
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386 | void read(std::istream& is, Value& value) const { |
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387 | char c; |
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388 | if (!(is >> c) || c != '(') |
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389 | throw DataFormatError("InsertReader format error"); |
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390 | while (is >> c && c != ')') { |
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391 | is.putback(c); |
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392 | typename ItemReader::Value item; |
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393 | item_reader.read(is, item); |
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394 | value.insert(item); |
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395 | } |
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396 | if (!is) throw DataFormatError("PushBackReader format error"); |
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397 | } |
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398 | |
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399 | }; |
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400 | |
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401 | /// \ingroup item_io |
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402 | /// \brief Reader for parsed string. |
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403 | /// |
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404 | /// Reader for parsed strings. You can define the open and close |
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405 | /// parse characters. It reads from the input a character sequence |
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406 | /// which is right parsed. |
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407 | /// |
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408 | /// \author Balazs Dezso |
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409 | class ParsedStringReader { |
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410 | public: |
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411 | typedef std::string Value; |
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412 | |
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413 | /// \brief Constructor. |
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414 | /// |
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415 | /// Constructor for ParsedStringReader. You can give as parameter |
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416 | /// the open and close parse characters. |
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417 | ParsedStringReader(char _open = '(', char _close = ')') |
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418 | : open(_open), close(_close) {} |
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419 | |
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420 | |
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421 | /// \brief Reads the parsed string from the given stream. |
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422 | /// |
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423 | /// Reads the parsed string from the given stream. |
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424 | void read(std::istream& is, Value& value) const { |
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425 | char c; |
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426 | value.clear(); |
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427 | if (!(is >> c) || c != open) { |
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428 | throw DataFormatError("ParsedStringReader format error"); |
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429 | } |
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430 | value += c; |
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431 | int counter = 1; |
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432 | while (counter > 0 && is >> c) { |
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433 | if (c == close) { |
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434 | --counter; |
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435 | } else if (c == open) { |
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436 | ++counter; |
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437 | } |
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438 | value += c; |
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439 | } |
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440 | if (!is) { |
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441 | throw DataFormatError("ParsedStrinReader format error"); |
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442 | } |
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443 | } |
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444 | |
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445 | private: |
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446 | char open, close; |
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447 | |
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448 | }; |
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449 | |
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450 | /// \ingroup item_io |
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451 | /// \brief Reader for read the whole line. |
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452 | /// |
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453 | /// Reader for read the whole line. |
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454 | /// |
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455 | /// \author Balazs Dezso |
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456 | class LineReader { |
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457 | public: |
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458 | typedef std::string Value; |
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459 | |
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460 | /// \brief Constructor. |
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461 | /// |
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462 | /// Constructor for the LineReader. If the given parameter is |
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463 | /// true then the spaces before the first not space character are |
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464 | /// skipped. |
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465 | LineReader(bool _skipSpaces = true) : skipSpaces(_skipSpaces) {} |
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466 | |
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467 | /// \brief Reads the line from the given stream. |
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468 | /// |
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469 | /// Reads the line from the given stream. |
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470 | void read(std::istream& is, Value& value) const { |
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471 | if (skipSpaces) is >> std::ws; |
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472 | if (!getline(is, value)) { |
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473 | throw DataFormatError("LineReader format error"); |
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474 | } |
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475 | } |
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476 | private: |
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477 | bool skipSpaces; |
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478 | }; |
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479 | |
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480 | /// \ingroup item_io |
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481 | /// \brief Reader for std::pair. |
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482 | /// |
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483 | /// Reader for std::pair. |
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484 | /// |
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485 | /// \author Balazs Dezso |
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486 | template <typename _Pair, |
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487 | typename _FirstReader = |
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488 | DefaultReader<typename _Pair::first_type>, |
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489 | typename _SecondReader = |
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490 | DefaultReader<typename _Pair::second_type> > |
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491 | class PairReader { |
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492 | public: |
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493 | typedef _Pair Value; |
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494 | |
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495 | typedef _FirstReader FirstReader; |
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496 | typedef _SecondReader SecondReader; |
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497 | |
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498 | private: |
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499 | |
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500 | FirstReader first_reader; |
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501 | SecondReader second_reader; |
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502 | |
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503 | public: |
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504 | |
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505 | /// \brief Constructor. |
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506 | /// |
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507 | /// Constructor for the PairReader. |
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508 | PairReader(const FirstReader& _first_reader = FirstReader(), |
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509 | const SecondReader& _second_reader = SecondReader()) |
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510 | : first_reader(_first_reader), second_reader(_second_reader) {} |
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511 | |
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512 | /// \brief Reads the pair from the given stream. |
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513 | /// |
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514 | /// Reads the pair from the given stream. |
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515 | void read(std::istream& is, Value& value) const { |
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516 | char c; |
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517 | if (!(is >> c) || c != '(') { |
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518 | throw DataFormatError("PairReader format error"); |
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519 | } |
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520 | first_reader.read(is, value.first); |
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521 | if (!(is >> c) || c != '=') { |
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522 | throw DataFormatError("PairReader format error"); |
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523 | } |
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524 | if (!(is >> c) || c != '>') { |
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525 | throw DataFormatError("PairReader format error"); |
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526 | } |
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527 | second_reader.read(is, value.second); |
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528 | if (!(is >> c) || c != ')') { |
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529 | throw DataFormatError("PairReader format error"); |
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530 | } |
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531 | } |
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532 | }; |
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533 | |
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534 | /// \ingroup item_io |
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535 | /// |
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536 | /// \brief The default item reader template class. |
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537 | /// |
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538 | /// The default item reader template class. If some section reader |
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539 | /// needs to read a value from a stream it will give the default way for it. |
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540 | /// |
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541 | /// \author Balazs Dezso |
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542 | template <typename _Value> |
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543 | class DefaultReader { |
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544 | public: |
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545 | /// The value type. |
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546 | typedef _Value Value; |
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547 | /// \brief Reads a value from the given stream. |
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548 | /// |
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549 | /// Reads a value from the given stream. |
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550 | void read(std::istream& is, Value& value) const { |
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551 | if (!(is >> value)) |
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552 | throw DataFormatError("DefaultReader format error"); |
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553 | } |
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554 | }; |
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555 | |
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556 | template <> |
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557 | class DefaultReader<std::string> { |
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558 | public: |
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559 | typedef std::string Value; |
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560 | |
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561 | void read(std::istream& is, Value& value) const { |
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562 | char c; |
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563 | if (!(is >> std::ws >> c)) |
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564 | throw DataFormatError("DefaultReader<string> format error"); |
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565 | is.putback(c); |
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566 | switch (c) { |
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567 | case '\"': |
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568 | QuotedStringReader().read(is, value); |
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569 | break; |
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570 | default: |
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571 | UnformattedReader().read(is, value); |
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572 | break; |
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573 | } |
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574 | } |
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575 | |
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576 | }; |
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577 | |
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578 | template <> |
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579 | class DefaultReader<char> { |
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580 | public: |
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581 | typedef char Value; |
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582 | |
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583 | void read(std::istream& is, Value& value) const { |
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584 | char c; |
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585 | if (!(is >> std::ws >> c)) |
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586 | throw DataFormatError("DefaultReader<char> format error"); |
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587 | is.putback(c); |
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588 | switch (c) { |
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589 | case '\'': |
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590 | QuotedCharReader().read(is, value); |
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591 | break; |
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592 | default: |
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593 | { |
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594 | int temp; |
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595 | if (!(is >> temp)) |
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596 | throw DataFormatError("DefaultReader<char> format error"); |
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597 | value = (char)temp; |
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598 | break; |
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599 | } |
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600 | } |
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601 | } |
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602 | }; |
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603 | |
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604 | template <> |
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605 | class DefaultReader<bool> { |
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606 | public: |
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607 | typedef bool Value; |
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608 | |
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609 | void read(std::istream& is, Value& value) const { |
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610 | std::string rep; |
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611 | if (!(is >> rep)) |
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612 | throw DataFormatError("DefaultReader<bool> format error"); |
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613 | if (rep == "true" || rep == "t" || rep == "1") { |
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614 | value = true; |
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615 | } else if (rep == "false" || rep == "f" || rep == "0") { |
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616 | value = false; |
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617 | } else throw DataFormatError("DefaultReader<bool> format error"); |
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618 | } |
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619 | }; |
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620 | |
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621 | template <typename Item> |
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622 | class DefaultReader<std::vector<Item> > |
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623 | : public PushBackReader<std::vector<Item> > {}; |
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624 | |
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625 | template <typename Item> |
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626 | class DefaultReader<std::deque<Item> > |
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627 | : public PushBackReader<std::deque<Item> > {}; |
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628 | |
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629 | template <typename Item> |
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630 | class DefaultReader<std::list<Item> > |
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631 | : public PushBackReader<std::list<Item> > {}; |
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632 | |
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633 | template <typename Item> |
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634 | class DefaultReader<std::set<Item> > |
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635 | : public InsertReader<std::set<Item> > {}; |
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636 | |
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637 | template <typename Key, typename Value> |
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638 | class DefaultReader<std::map<Key, Value> > |
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639 | : public InsertReader<std::map<Key, Value>, |
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640 | DefaultReader<std::pair<Key, Value> > > {}; |
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641 | |
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642 | template <typename Item> |
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643 | class DefaultReader<std::multiset<Item> > |
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644 | : public InsertReader<std::multiset<Item> > {}; |
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645 | |
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646 | template <typename Key, typename Value> |
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647 | class DefaultReader<std::multimap<Key, Value> > |
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648 | : public InsertReader<std::multimap<Key, Value>, |
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649 | DefaultReader<std::pair<Key, Value> > > {}; |
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650 | |
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651 | template <typename First, typename Second> |
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652 | class DefaultReader<std::pair<First, Second> > |
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653 | : public PairReader<std::pair<First, Second> > {}; |
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654 | |
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655 | /// \ingroup item_io |
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656 | /// |
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657 | /// \brief The default item reader for skipping a value in the stream. |
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658 | /// |
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659 | /// The default item reader for skipping a value in the stream. |
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660 | /// |
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661 | /// \author Balazs Dezso |
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662 | class DefaultSkipper : public UnformattedReader {}; |
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663 | |
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664 | /// \ingroup item_io |
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665 | /// \brief Standard ReaderTraits for the GraphReader class. |
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666 | /// |
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667 | /// Standard ReaderTraits for the GraphReader class. |
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668 | /// It defines standard reading method for all type of value. |
---|
669 | /// \author Balazs Dezso |
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670 | struct DefaultReaderTraits { |
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671 | |
---|
672 | template <typename _Value> |
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673 | struct Reader : DefaultReader<_Value> {}; |
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674 | |
---|
675 | typedef DefaultSkipper Skipper; |
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676 | |
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677 | }; |
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678 | |
---|
679 | } |
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680 | |
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681 | #endif |
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