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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_octave_stream_h) |
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24 #define octave_octave_stream_h 1 |
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25 |
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26 class Matrix; |
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27 class string_vector; |
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28 class octave_value; |
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29 class octave_value_list; |
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30 |
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31 class istream; |
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32 class ostream; |
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33 class ostrstream; |
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34 |
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35 #include <string> |
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36 |
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37 #include "Array.h" |
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38 #include "data-conv.h" |
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39 #include "mach-info.h" |
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40 |
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41 struct |
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42 scanf_format_elt |
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43 { |
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44 scanf_format_elt (const char *txt = 0, int w = 0, bool d = false, |
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45 char typ = '\0', char mod = '\0') |
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46 : text (txt), width (w), discard (d), type (typ), modifier (mod) { } |
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47 |
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48 ~scanf_format_elt (void) { delete text; } |
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49 |
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50 const char *text; |
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51 int width; |
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52 bool discard; |
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53 char type; |
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54 char modifier; |
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55 }; |
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56 |
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57 class |
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58 scanf_format_list |
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59 { |
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60 public: |
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61 |
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62 scanf_format_list (const string& fmt = string ()); |
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63 |
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64 ~scanf_format_list (void); |
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65 |
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66 int num_conversions (void) { return nconv; } |
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67 |
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68 // The length can be different than the number of conversions. |
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69 // For example, "x %d y %d z" has 2 conversions but the length of |
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70 // the list is 3 because of the characters that appear after the |
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71 // last conversion. |
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72 |
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73 int length (void) { return list.length (); } |
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74 |
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75 const scanf_format_elt *first (void) |
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76 { |
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77 curr_idx = 0; |
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78 return current (); |
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79 } |
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80 |
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81 const scanf_format_elt *current (void) const |
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82 { return list.length () > 0 ? list.elem (curr_idx) : 0; } |
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83 |
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84 const scanf_format_elt *next (void) |
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85 { |
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86 curr_idx++; |
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87 if (curr_idx >= list.length ()) |
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88 curr_idx = 0; |
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89 return current (); |
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90 } |
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91 |
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92 void printme (void) const; |
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93 |
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94 bool ok (void) const { return (nconv >= 0); } |
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95 |
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96 operator void* () const |
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97 { |
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98 return ok () |
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99 ? static_cast<void *> (-1) : static_cast<void *> (0); |
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100 } |
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101 |
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102 bool all_character_conversions (void); |
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103 |
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104 bool all_numeric_conversions (void); |
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105 |
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106 private: |
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107 |
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108 // Number of conversions specified by this format string, or -1 if |
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109 // invalid conversions have been found. |
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110 int nconv; |
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111 |
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112 // Index to current element; |
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113 int curr_idx; |
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114 |
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115 // List of format elements. |
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116 Array<scanf_format_elt*> list; |
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117 |
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118 // Temporary buffer. |
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119 ostrstream *buf; |
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120 |
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121 void add_elt_to_list (int width, bool discard, char type, char modifier, |
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122 int& num_elts); |
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123 |
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124 void process_conversion (const string& s, int& i, int n, int& width, |
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125 bool& discard, char& type, char& modifier, |
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126 int& num_elts); |
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127 |
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128 int finish_conversion (const string& s, int& i, int n, int& width, |
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129 bool discard, char& type, char modifier, |
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130 int& num_elts); |
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131 // No copying! |
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132 |
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133 scanf_format_list (const scanf_format_list&); |
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134 |
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135 scanf_format_list& operator = (const scanf_format_list&); |
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136 }; |
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137 |
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138 struct |
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139 printf_format_elt |
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140 { |
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141 printf_format_elt (const char *txt = 0, int n = 0, char typ = '\0', |
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142 char mod = '\0') |
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143 : text (txt), args (n), type (typ), modifier (mod) { } |
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144 |
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145 ~printf_format_elt (void) { delete text; } |
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146 |
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147 const char *text; |
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148 int args; |
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149 char type; |
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150 char modifier; |
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151 }; |
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152 |
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153 class |
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154 printf_format_list |
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155 { |
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156 public: |
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157 |
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158 printf_format_list (const string& fmt = string ()); |
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159 |
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160 ~printf_format_list (void); |
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161 |
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162 int num_conversions (void) { return nconv; } |
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163 |
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164 const printf_format_elt *first (void) |
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165 { |
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166 curr_idx = 0; |
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167 return current (); |
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168 } |
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169 |
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170 const printf_format_elt *current (void) const |
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171 { return list.length () > 0 ? list.elem (curr_idx) : 0; } |
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172 |
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173 const printf_format_elt *next (void) |
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174 { |
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175 curr_idx++; |
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176 if (curr_idx >= list.length ()) |
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177 curr_idx = 0; |
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178 return current (); |
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179 } |
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180 |
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181 void printme (void) const; |
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182 |
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183 bool ok (void) const { return (nconv >= 0); } |
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184 |
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185 operator void* () const |
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186 { |
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187 return ok () |
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188 ? static_cast<void *> (-1) : static_cast<void *> (0); |
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189 } |
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190 |
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191 private: |
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192 |
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193 // Number of conversions specified by this format string, or -1 if |
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194 // invalid conversions have been found. |
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195 int nconv; |
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196 |
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197 // Index to current element; |
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198 int curr_idx; |
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199 |
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200 // List of format elements. |
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201 Array<printf_format_elt*> list; |
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202 |
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203 // Temporary buffer. |
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204 ostrstream *buf; |
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205 |
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206 void add_elt_to_list (int args, char type, char modifier, |
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207 int& num_elts); |
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208 |
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209 void process_conversion (const string& s, int& i, int n, int& args, |
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210 char& modifier, char& type, int& num_elts); |
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211 |
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212 void finish_conversion (const string& s, int& i, int args, |
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213 char modifier, char& type, int& num_elts); |
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214 |
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215 // No copying! |
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216 |
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217 printf_format_list (const printf_format_list&); |
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218 |
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219 printf_format_list& operator = (const printf_format_list&); |
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220 }; |
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221 |
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222 // Provide an interface for Octave streams. |
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223 |
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224 class |
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225 octave_base_stream |
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226 { |
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227 friend class octave_stream; |
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228 |
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229 public: |
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230 |
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231 octave_base_stream (ios::openmode arg_md = ios::in|ios::out, |
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232 oct_mach_info::float_format ff = oct_mach_info::native) |
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233 : md (arg_md), flt_fmt (ff), fail (false) { } |
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234 |
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235 virtual ~octave_base_stream (void) { } |
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236 |
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237 // The remaining functions are not specific to input or output only, |
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238 // and must be provided by the derived classes. |
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239 |
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240 // Position a stream at OFFSET relative to ORIGIN. |
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241 |
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242 virtual int seek (streamoff offset, ios::seek_dir origin) = 0; |
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243 |
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244 // Return current stream position. |
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245 |
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246 virtual long tell (void) const = 0; |
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247 |
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248 // Return non-zero if EOF has been reached on this stream. |
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249 |
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250 virtual bool eof (void) const = 0; |
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251 |
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252 // The name of the file. |
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253 |
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254 virtual string name (void) = 0; |
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255 |
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256 // If the derived class provides this function and it returns a |
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257 // pointer to a valid istream, scanf(), read(), getl(), and gets() |
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258 // will automatically work for this stream. |
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259 |
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260 virtual istream *input_stream (void) { return 0; } |
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261 |
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262 // If the derived class provides this function and it returns a |
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263 // pointer to a valid ostream, flush(), write(), and printf() will |
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264 // automatically work for this stream. |
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265 |
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266 virtual ostream *output_stream (void) { return 0; } |
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267 |
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268 bool ok (void) const { return ! fail; } |
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269 |
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270 // Return current error message for this stream. |
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271 |
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272 string error (bool clear, int& err_num); |
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273 |
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274 protected: |
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275 |
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276 int mode (void) { return md; } |
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277 |
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278 oct_mach_info::float_format float_format (void) { return flt_fmt; } |
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279 |
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280 // Set current error state and set fail to TRUE. |
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281 |
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282 void error (const string& msg); |
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283 |
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284 // Clear any error message and set fail to FALSE. |
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285 |
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286 void clear (void); |
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287 |
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288 private: |
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289 |
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290 // The permission bits for the file. Should be some combination of |
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291 // ios::open_mode bits. |
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292 int md; |
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293 |
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294 // Data format. |
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295 oct_mach_info::float_format flt_fmt; |
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296 |
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297 // TRUE if an error has occurred. |
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298 bool fail; |
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299 |
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300 // Should contain error message if fail is TRUE. |
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301 string errmsg; |
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302 |
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303 // Functions that are defined for all input streams (input streams |
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304 // are those that define is). |
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305 |
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306 string do_gets (int max_len, bool& err, bool strip_newline, |
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307 const char *fcn); |
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308 |
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309 string getl (int max_len, bool& err); |
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310 string gets (int max_len, bool& err); |
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311 |
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312 octave_value do_read (int nr, int nc, oct_data_conv::data_type dt, |
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313 int skip, oct_mach_info::float_format flt_fmt, |
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314 int& count); |
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315 |
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316 octave_value read (const Matrix& size, oct_data_conv::data_type dt, |
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317 int skip, oct_mach_info::float_format flt_fmt, |
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318 int& count); |
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319 |
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320 octave_value do_char_scanf (scanf_format_list& fmt_list, |
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321 int nr, int nc, int& count); |
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322 |
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323 octave_value do_real_scanf (scanf_format_list& fmt_list, |
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324 int nr, int nc, int& count); |
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325 |
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326 octave_value do_scanf (scanf_format_list& fmt_list, int nr, int nc, |
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327 int& count); |
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328 |
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329 octave_value scanf (const string& fmt, const Matrix& size, int& count); |
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330 |
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331 bool do_oscanf (const scanf_format_elt *elt, octave_value&); |
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332 |
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333 octave_value_list oscanf (const string& fmt); |
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334 |
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335 // Functions that are defined for all output streams (output streams |
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336 // are those that define os). |
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337 |
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338 int flush (void); |
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339 |
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340 int do_write (const Matrix& m, oct_data_conv::data_type dt, int skip, |
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341 oct_mach_info::float_format flt_fmt); |
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342 |
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343 int write (const octave_value& data, oct_data_conv::data_type dt, |
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344 int skip, oct_mach_info::float_format flt_fmt); |
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345 |
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346 int do_printf (printf_format_list& fmt_list, const octave_value_list& args); |
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347 |
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348 int printf (const string& fmt, const octave_value_list& args); |
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349 |
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350 int puts (const string& s); |
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351 |
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352 // We can always do this in terms of seek(), so the derived class |
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353 // only has to provide that. |
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354 |
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355 int rewind (void); |
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356 |
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357 void invalid_operation (const char *op, const char *rw); |
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358 |
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359 // No copying! |
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360 |
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361 octave_base_stream (const octave_base_stream&); |
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362 |
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363 octave_base_stream& operator = (const octave_base_stream&); |
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364 }; |
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365 |
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366 class |
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367 octave_stream |
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368 { |
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369 public: |
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370 |
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371 octave_stream (octave_base_stream *bs = 0, bool pf = false) |
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372 : rep (bs), preserve (pf) { } |
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373 |
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374 ~octave_stream (void) |
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375 { |
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376 if (! preserve) |
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377 delete rep; |
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378 } |
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379 |
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380 int flush (void); |
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381 |
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382 string getl (int max_len, bool& err); |
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383 string getl (const octave_value& max_len, bool& err); |
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384 |
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385 string gets (int max_len, bool& err); |
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386 string gets (const octave_value& max_len, bool& err); |
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387 |
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388 int seek (streamoff offset, ios::seek_dir origin); |
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389 int seek (const octave_value& offset, const octave_value& origin); |
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390 |
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391 long tell (void) const; |
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392 |
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393 int rewind (void); |
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394 |
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395 octave_value read (const Matrix& size, oct_data_conv::data_type dt, |
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396 int skip, oct_mach_info::float_format flt_fmt, |
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397 int& count); |
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398 |
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399 int write (const octave_value& data, oct_data_conv::data_type dt, |
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400 int skip, oct_mach_info::float_format flt_fmt); |
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401 |
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402 octave_value scanf (const string& fmt, const Matrix& size, int& count); |
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403 |
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404 octave_value_list oscanf (const string& fmt); |
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405 |
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406 int printf (const string& fmt, const octave_value_list& args); |
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407 |
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408 int puts (const string& s); |
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409 int puts (const octave_value& s); |
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410 |
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411 bool eof (void) const; |
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412 |
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413 string error (bool clear, int& err_num); |
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414 |
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415 string error (bool clear = false) |
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416 { |
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417 int err_num; |
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418 return error (clear, err_num); |
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419 } |
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420 |
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421 bool ok (void) const { return rep && rep->ok (); } |
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422 |
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423 operator void* () const |
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424 { |
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425 return ok () |
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426 ? static_cast<void *> (-1) : static_cast<void *> (0); |
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427 } |
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428 |
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429 string name (void); |
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430 |
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431 int mode (void); |
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432 |
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433 oct_mach_info::float_format float_format (void); |
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434 |
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435 static string mode_as_string (int mode); |
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436 |
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437 istream *input_stream (void) { return rep->input_stream (); } |
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438 |
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439 ostream *output_stream (void) { return rep->output_stream (); } |
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440 |
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441 private: |
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442 |
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443 // The actual representation of this stream. |
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444 octave_base_stream *rep; |
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445 |
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446 // If true, do not delete rep. |
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447 bool preserve; |
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448 |
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449 void invalid_stream_error (const char *op) const; |
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450 |
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451 bool stream_ok (const char *op, bool clear = true) const |
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452 { |
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453 bool retval = true; |
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454 |
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455 if (rep) |
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456 { |
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457 if (clear) |
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458 rep->clear (); |
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459 } |
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460 else |
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461 { |
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462 retval = false; |
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463 invalid_stream_error (op); |
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464 } |
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465 |
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466 return retval; |
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467 } |
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468 |
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469 void error (const string& msg) |
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470 { |
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471 if (rep) |
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472 rep->error (msg); |
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473 } |
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474 |
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475 // Must create named streams. |
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476 |
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477 octave_stream (void); |
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478 |
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479 // No copying! |
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480 |
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481 octave_stream (const octave_stream&); |
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482 |
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483 octave_stream& operator = (const octave_stream&); |
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484 }; |
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485 |
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486 class |
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487 octave_stream_list |
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488 { |
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489 protected: |
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490 |
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491 octave_stream_list (void) : list (32), curr_len (0) { } |
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492 |
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493 public: |
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494 |
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495 ~octave_stream_list (void) { } |
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496 |
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2902
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497 static octave_value insert (octave_base_stream *obs); |
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2117
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498 |
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499 static octave_stream *lookup (int fid); |
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500 static octave_stream *lookup (const octave_value& fid); |
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501 |
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502 static int remove (int fid); |
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503 static int remove (const octave_value& fid); |
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504 |
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505 static void clear (void); |
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506 |
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507 static string_vector get_info (int fid); |
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508 static string_vector get_info (const octave_value& fid); |
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509 |
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510 static string list_open_files (void); |
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511 |
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512 static octave_value open_file_numbers (void); |
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513 |
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2609
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514 static int get_file_number (const octave_value& fid); |
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515 |
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2117
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516 private: |
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517 |
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518 Array<octave_stream*> list; |
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519 |
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520 int curr_len; |
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521 |
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522 static octave_stream_list *instance; |
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523 |
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2902
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524 octave_value do_insert (octave_base_stream *obs); |
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2117
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525 |
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526 octave_stream *do_lookup (int fid) const; |
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527 octave_stream *do_lookup (const octave_value& fid) const; |
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528 |
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529 int do_remove (int fid); |
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530 int do_remove (const octave_value& fid); |
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531 |
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532 void do_clear (void); |
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533 |
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534 string_vector do_get_info (int fid) const; |
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535 string_vector do_get_info (const octave_value& fid) const; |
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536 |
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537 string do_list_open_files (void) const; |
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538 |
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539 octave_value do_open_file_numbers (void) const; |
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540 |
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2609
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541 int do_get_file_number (const octave_value& fid) const; |
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2117
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542 }; |
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543 |
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544 #endif |
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545 |
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546 /* |
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547 ;;; Local Variables: *** |
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548 ;;; mode: C++ *** |
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549 ;;; End: *** |
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550 */ |
