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 writer bits for lemon output. |
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22 | |
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23 | #ifndef LEMON_BITS_ITEM_WRITER_H |
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24 | #define LEMON_BITS_ITEM_WRITER_H |
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25 | |
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26 | #include <iostream> |
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27 | #include <sstream> |
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28 | #include <string> |
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29 | |
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30 | #include <vector> |
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31 | #include <deque> |
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32 | #include <list> |
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33 | #include <set> |
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34 | |
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35 | namespace lemon { |
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36 | |
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37 | template <typename Value> |
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38 | class DefaultWriter; |
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39 | |
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40 | /// \ingroup item_io |
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41 | /// \brief Writer class for quoted strings. |
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42 | /// |
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43 | /// Writer class for unformatted strings. |
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44 | /// \author Balazs Dezso |
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45 | class UnformattedWriter { |
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46 | public: |
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47 | typedef std::string Value; |
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48 | |
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49 | /// \brief Constructor for the writer. |
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50 | /// |
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51 | /// Constructor for the writer. |
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52 | UnformattedWriter() {} |
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53 | |
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54 | /// \brief Writes an unformatted string to the given stream. |
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55 | /// |
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56 | /// Writes an unformatted string to the given stream. |
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57 | void write(std::ostream& os, const std::string& value) const { |
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58 | os << value; |
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59 | } |
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60 | |
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61 | bool readable(const std::string& value) const { |
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62 | std::istringstream is(value); |
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63 | char c; |
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64 | while (is.get(c) && !whiteSpace(c)) { |
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65 | if (!processChar(c, is)) return false; |
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66 | } |
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67 | if (is) return false; |
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68 | return true; |
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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 | bool processChar(char c, std::istream& is) 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 | if (!readableParsed('(', ')', is)) return false; |
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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 | if (!readableParsed('[', ']', is)) return false; |
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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 | if (!readableParsed('{', '}', is)) return false; |
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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 | if (!readableParsed('/', '/', is)) return false; |
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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 | if (!readableQuoted('\"', is)) return false; |
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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 | if (!readableQuoted('\'', is)) return false; |
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98 | break; |
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99 | default: |
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100 | break; |
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101 | } |
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102 | return true; |
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103 | } |
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104 | |
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105 | bool readableParsed(char open, char close, std::istream& is) const { |
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106 | char c; |
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107 | if (!is.get(c) || c != open) return false; |
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108 | while (is.get(c) && c != close) { |
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109 | if (!processChar(c, is)) return false; |
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110 | } |
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111 | if (!is) return false; |
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112 | return true; |
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113 | } |
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114 | |
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115 | bool readableQuoted(char quote, std::istream& is) const { |
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116 | char c; |
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117 | bool esc = false; |
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118 | if (!is.get(c) || c != quote) return false; |
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119 | while (is.get(c) && (c != quote || esc)) { |
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120 | if (c == '\\') esc = !esc; |
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121 | else esc = false; |
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122 | } |
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123 | if (!is) return false; |
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124 | return true; |
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125 | } |
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126 | |
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127 | static bool whiteSpace(char c) { |
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128 | return c == ' ' || c == '\t' || c == '\v' || |
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129 | c == '\n' || c == '\r' || c == '\f'; |
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130 | } |
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131 | |
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132 | }; |
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133 | |
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134 | /// \ingroup item_io |
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135 | /// \brief Writer class for quoted strings. |
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136 | /// |
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137 | /// Writer class for quoted strings. It can process the escape |
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138 | /// sequences in the string. |
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139 | /// \author Balazs Dezso |
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140 | class QuotedStringWriter { |
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141 | friend class QuotedCharWriter; |
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142 | public: |
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143 | typedef std::string Value; |
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144 | |
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145 | /// \brief Constructor for the writer. |
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146 | /// |
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147 | /// Constructor for the writer. If the given parameter is true |
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148 | /// the writer creates escape sequences from special characters. |
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149 | QuotedStringWriter(bool _escaped = true) : escaped(_escaped) {} |
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150 | |
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151 | /// \brief Writes a quoted string to the given stream. |
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152 | /// |
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153 | /// Writes a quoted string to the given stream. |
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154 | void write(std::ostream& os, const std::string& value) const { |
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155 | os << "\""; |
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156 | if (escaped) { |
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157 | std::ostringstream ls; |
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158 | for (int i = 0; i < (int)value.size(); ++i) { |
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159 | writeEscape(ls, value[i]); |
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160 | } |
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161 | os << ls.str(); |
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162 | } else { |
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163 | os << value; |
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164 | } |
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165 | os << "\""; |
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166 | } |
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167 | |
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168 | private: |
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169 | |
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170 | static void writeEscape(std::ostream& os, char c) { |
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171 | switch (c) { |
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172 | case '\\': |
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173 | os << "\\\\"; |
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174 | return; |
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175 | case '\"': |
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176 | os << "\\\""; |
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177 | return; |
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178 | case '\'': |
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179 | os << "\\\'"; |
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180 | return; |
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181 | case '\?': |
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182 | os << "\\\?"; |
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183 | return; |
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184 | case '\a': |
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185 | os << "\\a"; |
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186 | return; |
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187 | case '\b': |
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188 | os << "\\b"; |
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189 | return; |
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190 | case '\f': |
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191 | os << "\\f"; |
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192 | return; |
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193 | case '\r': |
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194 | os << "\\r"; |
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195 | return; |
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196 | case '\n': |
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197 | os << "\\n"; |
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198 | return; |
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199 | case '\t': |
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200 | os << "\\t"; |
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201 | return; |
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202 | case '\v': |
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203 | os << "\\v"; |
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204 | return; |
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205 | default: |
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206 | if (c < 0x20) { |
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207 | os << '\\' << std::oct << (int)c; |
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208 | } else { |
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209 | os << c; |
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210 | } |
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211 | return; |
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212 | } |
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213 | } |
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214 | private: |
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215 | bool escaped; |
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216 | }; |
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217 | |
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218 | /// \ingroup item_io |
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219 | /// \brief Writer class for quoted chars. |
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220 | /// |
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221 | /// Writer class for quoted char. It can process the escape |
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222 | /// sequences in the string. |
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223 | /// \author Balazs Dezso |
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224 | class QuotedCharWriter { |
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225 | public: |
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226 | typedef char Value; |
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227 | |
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228 | /// \brief Constructor for the writer. |
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229 | /// |
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230 | /// Constructor for the writer. If the given parameter is true |
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231 | /// the writer creates escape sequences from special characters. |
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232 | QuotedCharWriter(bool _escaped = true) : escaped(_escaped) {} |
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233 | |
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234 | /// \brief Writes a quoted char to the given stream. |
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235 | /// |
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236 | /// Writes a quoted char to the given stream. |
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237 | void write(std::ostream& os, const char& value) const { |
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238 | os << "\'"; |
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239 | if (escaped) { |
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240 | std::ostringstream ls; |
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241 | QuotedStringWriter::writeEscape(ls, value); |
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242 | os << ls.str(); |
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243 | } else { |
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244 | os << value; |
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245 | } |
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246 | os << "\'"; |
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247 | } |
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248 | |
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249 | private: |
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250 | bool escaped; |
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251 | }; |
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252 | |
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253 | /// \ingroup item_io |
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254 | /// \brief Writer class for quoted char array. |
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255 | /// |
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256 | /// Writer class for quoted char array. It can process the escape |
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257 | /// sequences in the char array. |
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258 | /// \author Balazs Dezso |
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259 | class QuotedCharArrayWriter { |
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260 | public: |
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261 | typedef const char* Value; |
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262 | |
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263 | /// \brief Constructor for the writer. |
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264 | /// |
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265 | /// Constructor for the writer. If the given parameter is true |
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266 | /// the writer creates escape sequences from special characters. |
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267 | QuotedCharArrayWriter(bool _escaped = true) : escaped(_escaped) {} |
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268 | |
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269 | /// \brief Writes a quoted char array to the given stream. |
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270 | /// |
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271 | /// Writes a quoted char array to the given stream. |
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272 | void write(std::ostream& os, const char* value) const { |
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273 | QuotedStringWriter(escaped).write(os, std::string(value)); |
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274 | } |
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275 | |
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276 | private: |
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277 | bool escaped; |
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278 | }; |
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279 | |
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280 | |
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281 | /// \ingroup item_io |
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282 | /// |
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283 | /// \brief Writer for standard containers. |
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284 | /// |
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285 | /// Writer for each iterable standard containers. The representation |
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286 | /// of the container is the values enumerated between an open and a |
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287 | /// close parse. |
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288 | /// |
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289 | /// \author Balazs Dezso |
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290 | template < |
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291 | typename _Container, |
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292 | typename _ItemWriter = DefaultWriter<typename _Container::value_type> |
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293 | > |
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294 | class IterableWriter { |
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295 | public: |
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296 | typedef _Container Value; |
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297 | typedef _ItemWriter ItemWriter; |
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298 | |
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299 | private: |
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300 | |
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301 | ItemWriter item_writer; |
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302 | |
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303 | public: |
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304 | |
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305 | IterableWriter(const ItemWriter& _item_writer = ItemWriter()) |
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306 | : item_writer(_item_writer) {} |
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307 | |
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308 | /// \brief Writes the values of the container to the given stream. |
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309 | /// |
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310 | /// Writes the values of the container to the given stream. |
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311 | void write(std::ostream& os, const Value& value) const { |
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312 | typename Value::const_iterator it; |
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313 | os << '('; |
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314 | for (it = value.begin(); it != value.end(); ++it) { |
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315 | item_writer.write(os, *it); |
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316 | os << ' '; |
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317 | } |
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318 | os << ')'; |
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319 | } |
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320 | |
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321 | }; |
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322 | |
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323 | /// \ingroup item_io |
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324 | /// |
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325 | /// \brief Writer for standard pairs. |
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326 | /// |
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327 | /// Writer for standard pairs. The representation of a pair is |
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328 | ///\code ( first_value => second_value ) \endcode. |
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329 | /// \author Balazs Dezso |
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330 | template <typename _Pair, |
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331 | typename _FirstWriter = |
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332 | DefaultWriter<typename _Pair::first_type>, |
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333 | typename _SecondWriter = |
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334 | DefaultWriter<typename _Pair::second_type> > |
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335 | class PairWriter { |
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336 | public: |
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337 | |
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338 | typedef _Pair Value; |
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339 | |
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340 | typedef _FirstWriter FirstWriter; |
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341 | typedef _SecondWriter SecondWriter; |
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342 | |
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343 | private: |
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344 | |
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345 | FirstWriter first_writer; |
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346 | SecondWriter second_writer; |
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347 | |
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348 | public: |
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349 | |
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350 | /// \brief Constructor. |
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351 | /// |
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352 | /// Constructor for the PairWriter. |
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353 | PairWriter(const FirstWriter& _first_writer = FirstWriter(), |
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354 | const SecondWriter& _second_writer = SecondWriter()) |
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355 | : first_writer(_first_writer), second_writer(_second_writer) {} |
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356 | |
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357 | /// \brief Writes the pair from the given stream. |
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358 | /// |
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359 | /// Writes the pair from the given stream. |
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360 | void write(std::ostream& os, const Value& value) const { |
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361 | os << "( "; |
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362 | first_writer.write(os, value.first); |
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363 | os << " => "; |
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364 | second_writer.write(os, value.second); |
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365 | os << " )"; |
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366 | } |
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367 | |
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368 | }; |
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369 | |
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370 | /// \ingroup item_io |
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371 | /// |
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372 | /// \brief The default item writer template class. |
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373 | /// |
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374 | /// The default item writer template class. If some section writer |
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375 | /// needs to write a value to the stream it will give the default way for it. |
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376 | /// |
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377 | /// \author Balazs Dezso |
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378 | template <typename _Value> |
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379 | class DefaultWriter { |
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380 | public: |
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381 | /// The value type. |
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382 | typedef _Value Value; |
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383 | /// \brief Writes the value to the given stream. |
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384 | /// |
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385 | /// Writes the value to the given stream. |
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386 | void write(std::ostream& os, const Value& value) const { |
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387 | os << value; |
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388 | } |
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389 | }; |
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390 | |
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391 | template <> |
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392 | class DefaultWriter<std::string> { |
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393 | public: |
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394 | typedef std::string Value; |
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395 | |
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396 | void write(std::ostream& os, const Value& value) const { |
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397 | if (UnformattedWriter().readable(value)) { |
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398 | UnformattedWriter().write(os, value); |
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399 | } else { |
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400 | QuotedStringWriter().write(os, value); |
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401 | } |
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402 | } |
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403 | |
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404 | }; |
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405 | |
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406 | template <> |
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407 | class DefaultWriter<char> |
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408 | : public QuotedCharWriter {}; |
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409 | |
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410 | template <> |
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411 | class DefaultWriter<bool> { |
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412 | public: |
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413 | typedef bool Value; |
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414 | |
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415 | void write(std::ostream& os, const Value& value) const { |
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416 | os << (value ? "1" : "0"); |
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417 | } |
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418 | |
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419 | }; |
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420 | |
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421 | template <int length> |
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422 | class DefaultWriter<char[length]> |
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423 | : public QuotedCharArrayWriter {}; |
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424 | |
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425 | template <int length> |
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426 | class DefaultWriter<const char[length]> |
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427 | : public QuotedCharArrayWriter {}; |
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428 | |
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429 | template <> |
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430 | class DefaultWriter<char*> |
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431 | : public QuotedCharArrayWriter {}; |
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432 | |
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433 | template <> |
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434 | class DefaultWriter<const char*> |
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435 | : public QuotedCharArrayWriter {}; |
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436 | |
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437 | template <typename Item> |
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438 | class DefaultWriter<std::vector<Item> > |
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439 | : public IterableWriter<std::vector<Item> > {}; |
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440 | |
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441 | template <typename Item> |
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442 | class DefaultWriter<std::deque<Item> > |
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443 | : public IterableWriter<std::deque<Item> > {}; |
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444 | |
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445 | template <typename Item> |
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446 | class DefaultWriter<std::list<Item> > |
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447 | : public IterableWriter<std::list<Item> > {}; |
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448 | |
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449 | template <typename Item> |
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450 | class DefaultWriter<std::set<Item> > |
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451 | : public IterableWriter<std::set<Item> > {}; |
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452 | |
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453 | template <typename Key, typename Value> |
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454 | class DefaultWriter<std::map<Key, Value> > |
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455 | : public IterableWriter<std::map<Key, Value> > {}; |
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456 | |
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457 | template <typename Item> |
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458 | class DefaultWriter<std::multiset<Item> > |
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459 | : public IterableWriter<std::multiset<Item> > {}; |
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460 | |
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461 | template <typename Key, typename Value> |
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462 | class DefaultWriter<std::multimap<Key, Value> > |
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463 | : public IterableWriter<std::multimap<Key, Value> > {}; |
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464 | |
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465 | template <typename First, typename Second> |
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466 | class DefaultWriter<std::pair<First, Second> > |
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467 | : public PairWriter<std::pair<First, Second> > {}; |
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468 | |
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469 | /// \ingroup item_io |
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470 | /// \brief Standard WriterTraits for the section writers. |
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471 | /// |
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472 | /// Standard WriterTraits for the section writers. |
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473 | /// It defines standard writing method for all type of value. |
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474 | /// \author Balazs Dezso |
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475 | struct DefaultWriterTraits { |
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476 | |
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477 | template <typename _Value> |
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478 | struct Writer : DefaultWriter<_Value> { |
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479 | typedef DefaultWriter<_Value> Parent; |
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480 | }; |
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481 | |
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482 | }; |
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483 | |
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484 | } |
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485 | |
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486 | #endif |
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