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