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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 bool () const { return ok (); } |
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97 |
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98 bool all_character_conversions (void); |
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99 |
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100 bool all_numeric_conversions (void); |
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101 |
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102 private: |
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103 |
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104 // Number of conversions specified by this format string, or -1 if |
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105 // invalid conversions have been found. |
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106 int nconv; |
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107 |
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108 // Index to current element; |
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109 int curr_idx; |
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110 |
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111 // List of format elements. |
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112 Array<scanf_format_elt*> list; |
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113 |
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114 // Temporary buffer. |
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115 ostrstream *buf; |
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116 |
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117 void add_elt_to_list (int width, bool discard, char type, char modifier, |
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118 int& num_elts); |
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119 |
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120 void process_conversion (const string& s, int& i, int n, int& width, |
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121 bool& discard, char& type, char& modifier, |
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122 int& num_elts); |
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123 |
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124 int finish_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 // No copying! |
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128 |
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129 scanf_format_list (const scanf_format_list&); |
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130 |
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131 scanf_format_list& operator = (const scanf_format_list&); |
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132 }; |
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133 |
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134 struct |
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135 printf_format_elt |
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136 { |
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137 printf_format_elt (const char *txt = 0, int n = 0, char typ = '\0', |
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138 char mod = '\0') |
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139 : text (txt), args (n), type (typ), modifier (mod) { } |
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140 |
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141 ~printf_format_elt (void) { delete text; } |
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142 |
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143 const char *text; |
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144 int args; |
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145 char type; |
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146 char modifier; |
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147 }; |
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148 |
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149 class |
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150 printf_format_list |
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151 { |
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152 public: |
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153 |
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154 printf_format_list (const string& fmt = string ()); |
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155 |
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156 ~printf_format_list (void); |
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157 |
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158 int num_conversions (void) { return nconv; } |
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159 |
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160 const printf_format_elt *first (void) |
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161 { |
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162 curr_idx = 0; |
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163 return current (); |
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164 } |
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165 |
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166 const printf_format_elt *current (void) const |
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167 { return list.length () > 0 ? list.elem (curr_idx) : 0; } |
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168 |
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169 const printf_format_elt *next (void) |
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170 { |
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171 curr_idx++; |
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172 if (curr_idx >= list.length ()) |
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173 curr_idx = 0; |
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174 return current (); |
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175 } |
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176 |
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177 void printme (void) const; |
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178 |
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179 bool ok (void) const { return (nconv >= 0); } |
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180 |
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181 operator bool () const { return ok (); } |
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182 |
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183 private: |
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184 |
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185 // Number of conversions specified by this format string, or -1 if |
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186 // invalid conversions have been found. |
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187 int nconv; |
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188 |
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189 // Index to current element; |
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190 int curr_idx; |
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191 |
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192 // List of format elements. |
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193 Array<printf_format_elt*> list; |
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194 |
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195 // Temporary buffer. |
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196 ostrstream *buf; |
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197 |
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198 void add_elt_to_list (int args, char type, char modifier, |
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199 int& num_elts); |
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200 |
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201 void process_conversion (const string& s, int& i, int n, int& args, |
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202 char& modifier, char& type, int& num_elts); |
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203 |
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204 void finish_conversion (const string& s, int& i, int args, |
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205 char modifier, char& type, int& num_elts); |
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206 |
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207 // No copying! |
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208 |
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209 printf_format_list (const printf_format_list&); |
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210 |
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211 printf_format_list& operator = (const printf_format_list&); |
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212 }; |
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213 |
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214 // Provide an interface for Octave streams. |
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215 |
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216 class |
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217 octave_base_stream |
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218 { |
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219 friend class octave_stream; |
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220 |
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221 public: |
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222 |
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223 octave_base_stream (ios::openmode arg_md = ios::in|ios::out, |
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224 oct_mach_info::float_format ff = oct_mach_info::native) |
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225 : md (arg_md), flt_fmt (ff), fail (false) { } |
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226 |
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227 virtual ~octave_base_stream (void) { } |
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228 |
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229 // The remaining functions are not specific to input or output only, |
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230 // and must be provided by the derived classes. |
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231 |
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232 // Position a stream at OFFSET relative to ORIGIN. |
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233 |
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234 virtual int seek (streamoff offset, ios::seek_dir origin) = 0; |
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235 |
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236 // Return current stream position. |
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237 |
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238 virtual long tell (void) const = 0; |
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239 |
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240 // Return non-zero if EOF has been reached on this stream. |
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241 |
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242 virtual bool eof (void) const = 0; |
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243 |
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244 // The name of the file. |
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245 |
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246 virtual string name (void) = 0; |
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247 |
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248 // If the derived class provides this function and it returns a |
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249 // pointer to a valid istream, scanf(), read(), getl(), and gets() |
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250 // will automatically work for this stream. |
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251 |
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252 virtual istream *input_stream (void) { return 0; } |
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253 |
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254 // If the derived class provides this function and it returns a |
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255 // pointer to a valid ostream, flush(), write(), and printf() will |
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256 // automatically work for this stream. |
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257 |
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258 virtual ostream *output_stream (void) { return 0; } |
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259 |
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260 int file_number (void); |
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261 |
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262 bool ok (void) const { return ! fail; } |
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263 |
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264 // Return current error message for this stream. |
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265 |
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266 string error (bool clear, int& err_num); |
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267 |
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268 protected: |
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269 |
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270 int mode (void) { return md; } |
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271 |
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272 oct_mach_info::float_format float_format (void) { return flt_fmt; } |
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273 |
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274 // Set current error state and set fail to TRUE. |
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275 |
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276 void error (const string& msg); |
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277 |
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278 // Clear any error message and set fail to FALSE. |
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279 |
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280 void clear (void); |
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281 |
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282 private: |
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283 |
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284 // The permission bits for the file. Should be some combination of |
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285 // ios::open_mode bits. |
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286 int md; |
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287 |
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288 // Data format. |
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289 oct_mach_info::float_format flt_fmt; |
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290 |
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291 // TRUE if an error has occurred. |
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292 bool fail; |
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293 |
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294 // Should contain error message if fail is TRUE. |
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295 string errmsg; |
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296 |
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297 // Functions that are defined for all input streams (input streams |
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298 // are those that define is). |
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299 |
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300 string do_gets (int max_len, bool& err, bool strip_newline, |
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301 const char *fcn); |
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302 |
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303 string getl (int max_len, bool& err); |
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304 string gets (int max_len, bool& err); |
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305 |
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306 octave_value do_read (int nr, int nc, oct_data_conv::data_type dt, |
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307 int skip, oct_mach_info::float_format flt_fmt, |
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308 int& count); |
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309 |
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310 octave_value read (const Matrix& size, oct_data_conv::data_type dt, |
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311 int skip, oct_mach_info::float_format flt_fmt, |
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312 int& count); |
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313 |
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314 octave_value do_char_scanf (scanf_format_list& fmt_list, |
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315 int nr, int nc, int& count); |
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316 |
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317 octave_value do_real_scanf (scanf_format_list& fmt_list, |
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318 int nr, int nc, int& count); |
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319 |
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320 octave_value do_scanf (scanf_format_list& fmt_list, int nr, int nc, |
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321 bool one_elt_size_spec, int& count); |
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322 |
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323 octave_value scanf (const string& fmt, const Matrix& size, int& count); |
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324 |
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325 bool do_oscanf (const scanf_format_elt *elt, octave_value&); |
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326 |
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327 octave_value_list oscanf (const string& fmt); |
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328 |
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329 // Functions that are defined for all output streams (output streams |
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330 // are those that define os). |
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331 |
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332 int flush (void); |
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333 |
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334 int do_write (const Matrix& m, oct_data_conv::data_type dt, int skip, |
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335 oct_mach_info::float_format flt_fmt); |
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336 |
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337 int write (const octave_value& data, oct_data_conv::data_type dt, |
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338 int skip, oct_mach_info::float_format flt_fmt); |
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339 |
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340 int do_printf (printf_format_list& fmt_list, const octave_value_list& args); |
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341 |
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342 int printf (const string& fmt, const octave_value_list& args); |
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343 |
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344 int puts (const string& s); |
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345 |
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346 // We can always do this in terms of seek(), so the derived class |
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347 // only has to provide that. |
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348 |
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349 int rewind (void); |
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350 |
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351 void invalid_operation (const char *op, const char *rw); |
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352 |
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353 // No copying! |
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354 |
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355 octave_base_stream (const octave_base_stream&); |
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356 |
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357 octave_base_stream& operator = (const octave_base_stream&); |
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358 }; |
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359 |
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360 class |
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361 octave_stream |
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362 { |
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363 public: |
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364 |
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365 octave_stream (octave_base_stream *bs = 0, bool pf = false) |
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366 : rep (bs), preserve (pf) { } |
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367 |
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368 ~octave_stream (void) |
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369 { |
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370 if (! preserve) |
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371 delete rep; |
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372 } |
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373 |
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374 int flush (void); |
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375 |
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376 string getl (int max_len, bool& err); |
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377 string getl (const octave_value& max_len, bool& err); |
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378 |
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379 string gets (int max_len, bool& err); |
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380 string gets (const octave_value& max_len, bool& err); |
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381 |
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382 int seek (streamoff offset, ios::seek_dir origin); |
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383 int seek (const octave_value& offset, const octave_value& origin); |
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384 |
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385 long tell (void) const; |
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386 |
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387 int rewind (void); |
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388 |
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389 octave_value read (const Matrix& size, oct_data_conv::data_type dt, |
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390 int skip, oct_mach_info::float_format flt_fmt, |
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391 int& count); |
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392 |
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393 int write (const octave_value& data, oct_data_conv::data_type dt, |
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394 int skip, oct_mach_info::float_format flt_fmt); |
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395 |
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396 octave_value scanf (const string& fmt, const Matrix& size, int& count); |
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397 |
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398 octave_value_list oscanf (const string& fmt); |
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399 |
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400 int printf (const string& fmt, const octave_value_list& args); |
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401 |
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402 int puts (const string& s); |
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403 int puts (const octave_value& s); |
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404 |
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405 bool eof (void) const; |
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406 |
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407 string error (bool clear, int& err_num); |
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408 |
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409 string error (bool clear = false) |
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410 { |
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411 int err_num; |
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412 return error (clear, err_num); |
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413 } |
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414 |
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415 int file_number (void) { return rep ? rep->file_number () : -1; } |
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416 |
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417 bool ok (void) const { return rep && rep->ok (); } |
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418 |
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419 operator bool () const { return ok (); } |
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420 |
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421 string name (void); |
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422 |
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423 int mode (void); |
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424 |
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425 oct_mach_info::float_format float_format (void); |
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426 |
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427 static string mode_as_string (int mode); |
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428 |
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429 istream *input_stream (void) { return rep->input_stream (); } |
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430 |
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431 ostream *output_stream (void) { return rep->output_stream (); } |
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432 |
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433 private: |
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434 |
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435 // The actual representation of this stream. |
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436 octave_base_stream *rep; |
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437 |
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438 // If true, do not delete rep. |
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439 bool preserve; |
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440 |
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441 void invalid_stream_error (const char *op) const; |
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442 |
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443 bool stream_ok (const char *op, bool clear = true) const |
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444 { |
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445 bool retval = true; |
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446 |
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447 if (rep) |
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448 { |
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449 if (clear) |
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450 rep->clear (); |
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451 } |
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452 else |
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453 { |
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454 retval = false; |
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455 invalid_stream_error (op); |
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456 } |
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457 |
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458 return retval; |
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459 } |
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460 |
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461 void error (const string& msg) |
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462 { |
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463 if (rep) |
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464 rep->error (msg); |
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465 } |
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466 |
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467 // Must create named streams. |
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468 |
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469 octave_stream (void); |
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470 |
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471 // No copying! |
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472 |
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473 octave_stream (const octave_stream&); |
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474 |
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475 octave_stream& operator = (const octave_stream&); |
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476 }; |
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477 |
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478 class |
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479 octave_stream_list |
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480 { |
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481 protected: |
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482 |
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483 octave_stream_list (void) : list (32), curr_len (0) { } |
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484 |
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485 public: |
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486 |
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487 ~octave_stream_list (void) { } |
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488 |
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2926
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489 static bool instance_ok (void); |
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490 |
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2902
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491 static octave_value insert (octave_base_stream *obs); |
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2117
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492 |
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493 static octave_stream *lookup (int fid); |
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494 static octave_stream *lookup (const octave_value& fid); |
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495 |
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496 static int remove (int fid); |
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497 static int remove (const octave_value& fid); |
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498 |
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499 static void clear (void); |
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500 |
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501 static string_vector get_info (int fid); |
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502 static string_vector get_info (const octave_value& fid); |
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503 |
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504 static string list_open_files (void); |
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505 |
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506 static octave_value open_file_numbers (void); |
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507 |
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2609
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508 static int get_file_number (const octave_value& fid); |
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509 |
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2117
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510 private: |
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511 |
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512 Array<octave_stream*> list; |
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513 |
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514 int curr_len; |
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515 |
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516 static octave_stream_list *instance; |
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517 |
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2902
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518 octave_value do_insert (octave_base_stream *obs); |
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2117
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519 |
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520 octave_stream *do_lookup (int fid) const; |
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521 octave_stream *do_lookup (const octave_value& fid) const; |
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522 |
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523 int do_remove (int fid); |
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524 int do_remove (const octave_value& fid); |
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525 |
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526 void do_clear (void); |
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527 |
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528 string_vector do_get_info (int fid) const; |
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529 string_vector do_get_info (const octave_value& fid) const; |
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530 |
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531 string do_list_open_files (void) const; |
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532 |
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533 octave_value do_open_file_numbers (void) const; |
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534 |
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2609
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535 int do_get_file_number (const octave_value& fid) const; |
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2117
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536 }; |
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537 |
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538 #endif |
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539 |
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540 /* |
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541 ;;; Local Variables: *** |
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542 ;;; mode: C++ *** |
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543 ;;; End: *** |
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544 */ |
