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1 // help.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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529
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28 #include <signal.h> |
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29 #include <stdlib.h> |
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30 #include <iostream.h> |
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529
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31 #include <strstream.h> |
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32 |
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529
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33 #include "tree.h" |
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34 #include "sighandlers.h" |
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35 #include "user-prefs.h" |
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36 #include "tree-expr.h" |
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37 #include "variables.h" |
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38 #include "oct-obj.h" |
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39 #include "symtab.h" |
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40 #include "octave.h" |
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41 #include "dirfns.h" |
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42 #include "pager.h" |
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43 #include "error.h" |
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242
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44 #include "utils.h" |
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45 #include "help.h" |
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529
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46 #include "defun.h" |
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47 |
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48 extern "C" |
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49 { |
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50 #include "info/info.h" |
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51 #include "info/dribble.h" |
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52 #include "info/terminal.h" |
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53 |
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54 extern int initialize_info_session (); |
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55 extern int index_entry_exists (); |
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56 extern int do_info_index_search (); |
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57 extern void finish_info_session (); |
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58 extern char *replace_in_documentation (); |
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59 |
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60 // XXX FIXME XXX |
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61 #undef __FUNCTION_DEF |
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62 #include <readline/tilde.h> |
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63 } |
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64 |
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65 static help_list operators[] = |
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66 { |
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67 { "!", |
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68 "Logical not operator. See also `~'.\n", }, |
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69 |
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70 { "!=", |
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71 "Logical not equals operator. See also `~' and `<>'.\n", }, |
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72 |
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73 { "\"", |
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74 "String delimiter.\n", }, |
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75 |
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76 { "#", |
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77 "Begin comment character. See also `%'.\n", }, |
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78 |
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79 { "%", |
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80 "Begin comment charcter. See also `#'.\n", }, |
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81 |
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82 { "&", |
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83 "Logical and operator. See also `&&'.\n", }, |
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84 |
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85 { "&&", |
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86 "Logical and operator. See also `&'.\n", }, |
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87 |
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88 { "'", |
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89 "Matrix transpose operator. For complex matrices, computes the\n\ |
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90 complex conjugate (Hermitian) transpose. See also `.''\n\ |
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91 \n\ |
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92 The single quote character may also be used to delimit strings, but\n\ |
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93 it is better to use the double quote character, since that is never\n\ |
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94 ambiguous\n", }, |
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95 |
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96 { "(", |
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97 "Array index or function argument delimiter.\n", }, |
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98 |
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99 { ")", |
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100 "Array index or function argument delimiter.\n", }, |
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101 |
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102 { "*", |
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103 "Multiplication operator. See also `.*'\n", }, |
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104 |
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105 { "**", |
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106 "Power operator. See also `^', `.**', and `.^'\n", }, |
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107 |
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108 { "+", |
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109 "Addition operator.\n", }, |
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110 |
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111 { "++", |
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112 "Increment operator. As in C, may be applied as a prefix or postfix operator.\n", }, |
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113 |
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114 { ",", |
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115 "Array index, function argument, or command separator.\n", }, |
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116 |
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117 { "-", |
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118 "Subtraction or unary negation operator.\n", }, |
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119 |
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120 { "--", |
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121 "Decrement operator. As in C, may be applied as a prefix or postfix operator.\n", }, |
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122 |
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123 { ".'", |
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124 "Matrix transpose operator. For complex matrices, computes the\n\ |
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125 transpose, *not* the complex conjugate transpose. See also `''.\n", }, |
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126 |
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127 { ".*", |
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128 "Element by element multiplication operator. See also `*'.\n", }, |
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129 |
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130 { ".**", |
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131 "Element by element power operator. See also `**', `^', and `.^'.\n", }, |
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132 |
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133 { "./", |
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134 "Element by element division operator. See also `/' and `\\'.\n", }, |
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135 |
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136 { ".^", |
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137 "Element by element power operator. See also `**', `^', and `.^'.\n", }, |
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138 |
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139 { "/", |
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140 "Right division. See also `\\' and `./'.\n", }, |
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141 |
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142 { ":", |
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143 "Select entire rows or columns of matrices.\n", }, |
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144 |
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145 { ";", |
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146 "Array row or command separator. See also `,'.\n", }, |
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147 |
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148 { "<", |
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149 "Less than operator.\n", }, |
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150 |
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151 { "<=", |
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152 "Less than or equals operator.\n", }, |
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153 |
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154 { "<>", |
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155 "Logical not equals operator. See also `!=' and `~='.\n", }, |
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156 |
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157 { "=", |
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158 "Assignment operator.\n", }, |
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159 |
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160 { "==", |
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161 "Equality test operator.\n", }, |
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162 |
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163 { ">", |
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164 "Greater than operator.\n", }, |
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165 |
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166 { ">=", |
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167 "Greater than or equals operator.\n", }, |
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168 |
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169 { "[", |
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170 "Return list delimiter. See also `]'.\n", }, |
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171 |
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172 { "\\", |
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173 "Left division operator. See also `/' and `./'.\n", }, |
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174 |
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175 { "]", |
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176 "Return list delimiter. See also `['.\n", }, |
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177 |
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178 { "^", |
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179 "Power operator. See also `**', `.^', and `.**.'\n", }, |
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180 |
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181 { "|", |
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182 "Logical or operator. See also `||'.\n", }, |
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183 |
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184 { "||", |
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185 "Logical or operator. See also `|'.\n", }, |
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186 |
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187 { "~", |
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188 "Logical not operator. See also `!' and `~'.\n", }, |
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189 |
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190 { "~=", |
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191 "Logical not equals operator. See also `<>' and `!='.\n", }, |
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192 |
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529
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193 { 0, 0, }, |
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194 }; |
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195 |
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196 static help_list keywords[] = |
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197 { |
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198 { "break", |
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199 "Exit the innermost enclosing while or for loop.\n", }, |
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200 |
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201 { "continue", |
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202 "Jump to the end of the innermost enclosing while or for loop.\n", }, |
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203 |
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204 { "else", |
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205 "Alternate action for an if block.\n", }, |
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206 |
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207 { "elseif", |
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208 "Alternate conditional test for an if block.\n", }, |
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209 |
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210 { "end", |
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211 "Mark the end of any for, if, while, or function block.\n", }, |
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212 |
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213 { "endfor", |
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214 "Mark the end of a for loop.\n", }, |
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215 |
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216 { "endfunction", |
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217 "Mark the end of a function.\n", }, |
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218 |
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219 { "endif", |
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220 "Mark the end of an if block.\n", }, |
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221 |
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222 { "endwhile", |
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223 "Mark the end of a while loop.\n", }, |
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224 |
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225 { "for", |
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226 "Begin a for loop.\n", }, |
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227 |
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228 { "function", |
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229 "Begin a function body.\n", }, |
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230 |
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231 { "global", |
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232 "Declare variables to have global scope.\n", }, |
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233 |
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234 { "gplot", |
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235 "Produce 2-D plots using gnuplot-like command syntax.\n", }, |
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236 |
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237 { "gsplot", |
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238 "Produce 3-D plots using gnuplot-like command syntax.\n", }, |
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239 |
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240 { "if", |
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241 "Begin an if block.\n", }, |
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242 |
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243 { "return", |
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244 "Return from a function.\n", }, |
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245 |
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246 { "while", |
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247 "Begin a while loop.\n", }, |
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248 |
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529
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249 { 0, 0, }, |
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250 }; |
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251 |
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242
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252 /* |
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253 * Return a copy of the operator or keyword names. |
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254 */ |
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255 char ** |
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256 names (help_list *lst, int& count) |
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257 { |
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258 count = 0; |
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259 help_list *ptr = lst; |
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260 while (ptr->name) |
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261 { |
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262 count++; |
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263 ptr++; |
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264 } |
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265 |
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266 if (count == 0) |
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267 return 0; |
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268 |
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269 char **name_list = new char * [count+1]; |
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270 |
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271 ptr = lst; |
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272 int i = 0; |
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273 while (ptr->name) |
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274 { |
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275 name_list[i++] = strsave (ptr->name); |
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276 ptr++; |
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277 } |
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278 |
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279 name_list[i] = 0; |
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280 return name_list; |
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281 } |
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282 |
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283 help_list * |
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284 operator_help (void) |
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285 { |
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286 return operators; |
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287 } |
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288 |
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289 help_list * |
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290 keyword_help (void) |
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291 { |
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292 return keywords; |
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293 } |
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294 |
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295 void |
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296 additional_help_message (ostrstream& output_buf) |
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297 { |
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298 output_buf |
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299 << "\n" |
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300 << "Additional help for builtin functions, operators, and variables\n" |
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301 << "is available in the on-line version of the manual.\n" |
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302 << "\n" |
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303 << "Use the command `help -i <topic>' to search the manual index.\n"; |
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304 } |
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305 |
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306 void |
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307 print_usage (const char *string, int just_usage) |
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308 { |
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309 ostrstream output_buf; |
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310 |
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311 symbol_record *sym_rec = global_sym_tab->lookup (string, 0, 0); |
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312 if (sym_rec) |
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313 { |
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314 char *h = sym_rec->help (); |
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315 if (h && *h) |
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316 { |
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317 output_buf << "\n*** " << string << ":\n\n" |
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318 << h << "\n"; |
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319 |
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320 if (! just_usage) |
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321 additional_help_message (output_buf); |
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322 output_buf << ends; |
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323 maybe_page_output (output_buf); |
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324 } |
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325 } |
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326 } |
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327 |
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328 static void |
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329 display_names_from_help_list (ostrstream& output_buf, help_list *list, |
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330 const char *desc) |
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331 { |
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332 int count = 0; |
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333 char **symbols = names (list, count); |
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334 output_buf << "\n*** " << desc << ":\n\n"; |
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335 if (symbols && count > 0) |
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336 list_in_columns (output_buf, symbols); |
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337 delete [] symbols; |
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338 } |
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339 |
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340 static void |
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341 display_symtab_names (ostrstream& output_buf, char **names, |
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342 int count, const char *desc) |
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343 { |
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344 output_buf << "\n*** " << desc << ":\n\n"; |
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345 if (names && count > 0) |
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346 list_in_columns (output_buf, names); |
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347 } |
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348 |
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349 static void |
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350 simple_help (void) |
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351 { |
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352 ostrstream output_buf; |
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353 |
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354 display_names_from_help_list (output_buf, operator_help (), |
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355 "operators"); |
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356 |
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357 display_names_from_help_list (output_buf, keyword_help (), |
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358 "reserved words"); |
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359 |
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360 #ifdef LIST_SYMBOLS |
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361 #undef LIST_SYMBOLS |
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362 #endif |
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363 #define LIST_SYMBOLS(type, msg) \ |
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364 do \ |
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365 { \ |
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366 int count; \ |
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367 char **names = global_sym_tab->list (count, 1, type); \ |
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368 display_symtab_names (output_buf, names, count, msg); \ |
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369 char **ptr = names; \ |
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370 while (*ptr) \ |
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371 delete [] *ptr++; \ |
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372 delete [] names; \ |
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373 } \ |
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374 while (0) |
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375 |
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376 // XXX FIXME XXX -- is this distinction needed? |
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377 LIST_SYMBOLS (symbol_def::TEXT_FUNCTION, |
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378 "text functions (these names are also reserved)"); |
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379 |
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380 LIST_SYMBOLS (symbol_def::MAPPER_FUNCTION, "mapper functions"); |
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381 |
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382 LIST_SYMBOLS (symbol_def::BUILTIN_FUNCTION, "general functions"); |
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383 |
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384 LIST_SYMBOLS (symbol_def::BUILTIN_VARIABLE, "builtin variables"); |
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385 |
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386 // Also need to list variables and currently compiled functions from |
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387 // the symbol table, if there are any. |
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388 |
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389 // Also need to search octave_path for script files. |
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390 |
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391 char **path = pathstring_to_vector (user_pref.loadpath); |
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392 |
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393 char **ptr = path; |
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394 if (ptr) |
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395 { |
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396 while (*ptr) |
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397 { |
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398 int count; |
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399 char **names = get_fcn_file_names (count, *ptr, 0); |
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400 output_buf << "\n*** function files in " |
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401 << make_absolute (*ptr, the_current_working_directory) |
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402 << ":\n\n"; |
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403 if (names && count > 0) |
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404 list_in_columns (output_buf, names); |
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405 delete [] names; |
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406 ptr++; |
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407 } |
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408 } |
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409 |
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410 additional_help_message (output_buf); |
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411 output_buf << ends; |
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412 maybe_page_output (output_buf); |
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413 } |
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414 |
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415 static int |
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416 try_info (const char *string, int force = 0) |
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417 { |
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418 int status = 0; |
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419 |
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420 char *directory_name = strsave (user_pref.info_file); |
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421 char *temp = filename_non_directory (directory_name); |
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422 |
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423 if (temp != directory_name) |
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424 { |
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425 *temp = 0; |
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426 info_add_path (directory_name, INFOPATH_PREPEND); |
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427 } |
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428 |
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429 delete [] directory_name; |
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430 |
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431 NODE *initial_node = info_get_node (user_pref.info_file, 0); |
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432 |
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433 if (! initial_node) |
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434 { |
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435 warning ("can't find info file!\n"); |
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436 status = -1; |
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437 } |
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438 else |
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439 { |
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440 status = initialize_info_session (initial_node, 0); |
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441 |
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442 if (status == 0 && (force || index_entry_exists (windows, string))) |
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443 { |
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444 terminal_clear_screen (); |
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445 |
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446 terminal_prep_terminal (); |
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447 |
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448 display_update_display (windows); |
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449 |
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450 info_last_executed_command = 0; |
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451 |
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452 if (! force) |
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453 do_info_index_search (windows, 0, string); |
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454 |
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455 char *format = replace_in_documentation |
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456 ("Type \"\\[quit]\" to quit, \"\\[get-help-window]\" for help."); |
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457 |
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458 window_message_in_echo_area (format); |
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459 |
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460 info_read_and_dispatch (); |
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461 |
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462 terminal_goto_xy (0, screenheight - 1); |
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463 |
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464 terminal_clear_to_eol (); |
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465 |
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466 terminal_unprep_terminal (); |
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467 |
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468 status = 1; |
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469 } |
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470 |
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471 finish_info_session (initial_node, 0); |
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472 } |
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473 |
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474 return status; |
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475 } |
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476 |
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542
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477 int |
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478 help_from_list (ostrstream& output_buf, const help_list *list, |
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479 const char *string, int usage) |
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480 { |
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481 char *name; |
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482 while ((name = list->name) != 0) |
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483 { |
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484 if (strcmp (name, string) == 0) |
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485 { |
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486 if (usage) |
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487 output_buf << "\nusage: "; |
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488 else |
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489 { |
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490 output_buf << "\n*** " << string << ":\n\n"; |
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491 } |
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492 |
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493 output_buf << list->help << "\n"; |
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494 |
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495 return 1; |
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496 } |
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497 list++; |
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498 } |
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499 return 0; |
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500 } |
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501 |
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529
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502 DEFUN_TEXT ("help", Fhelp, Shelp, -1, 1, |
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503 "help [-i] [topic ...]\n\ |
|
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504 \n\ |
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505 print cryptic yet witty messages") |
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506 { |
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507 Octave_object retval; |
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508 |
|
|
509 DEFINE_ARGV("help"); |
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510 |
|
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511 if (argc == 1) |
|
|
512 { |
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513 simple_help (); |
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514 } |
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515 else |
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516 { |
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517 if (argv[1] && strcmp (argv[1], "-i") == 0) |
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518 { |
|
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519 argc--; |
|
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520 argv++; |
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|
521 |
|
|
522 if (argc == 1) |
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523 { |
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524 volatile sig_handler *old_sigint_handler; |
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|
525 old_sigint_handler = signal (SIGINT, SIG_IGN); |
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|
526 |
|
|
527 try_info (0, 1); |
|
|
528 |
|
|
529 signal (SIGINT, old_sigint_handler); |
|
|
530 } |
|
|
531 else |
|
|
532 { |
|
|
533 while (--argc > 0) |
|
|
534 { |
|
|
535 argv++; |
|
|
536 |
|
|
537 if (! *argv || ! **argv) |
|
|
538 continue; |
|
|
539 |
|
|
540 volatile sig_handler *old_sigint_handler; |
|
|
541 old_sigint_handler = signal (SIGINT, SIG_IGN); |
|
|
542 |
|
|
543 if (! try_info (*argv)) |
|
|
544 { |
|
|
545 message ("help", |
|
|
546 "sorry, `%s' is not indexed in the manual", |
|
|
547 *argv); |
|
|
548 sleep (2); |
|
|
549 } |
|
|
550 |
|
|
551 signal (SIGINT, old_sigint_handler); |
|
|
552 } |
|
|
553 } |
|
|
554 } |
|
|
555 else |
|
|
556 { |
|
|
557 ostrstream output_buf; |
|
|
558 |
|
|
559 char *fcn_file_name = 0; |
|
|
560 symbol_record *sym_rec; |
|
|
561 help_list *op_help_list = operator_help (); |
|
|
562 help_list *kw_help_list = keyword_help (); |
|
|
563 |
|
|
564 while (--argc > 0) |
|
|
565 { |
|
|
566 argv++; |
|
|
567 |
|
|
568 if (! *argv || ! **argv) |
|
|
569 continue; |
|
|
570 |
|
|
571 if (help_from_list (output_buf, op_help_list, *argv, 0)) |
|
|
572 continue; |
|
|
573 |
|
|
574 if (help_from_list (output_buf, kw_help_list, *argv, 0)) |
|
|
575 continue; |
|
|
576 |
|
|
577 sym_rec = curr_sym_tab->lookup (*argv, 0, 0); |
|
|
578 if (sym_rec) |
|
|
579 { |
|
|
580 char *h = sym_rec->help (); |
|
|
581 if (h && *h) |
|
|
582 { |
|
|
583 output_buf << "\n*** " << *argv << ":\n\n" |
|
|
584 << h << "\n"; |
|
|
585 continue; |
|
|
586 } |
|
|
587 } |
|
|
588 |
|
|
589 sym_rec = global_sym_tab->lookup (*argv, 0, 0); |
|
|
590 if (sym_rec && ! symbol_out_of_date (sym_rec)) |
|
|
591 { |
|
|
592 char *h = sym_rec->help (); |
|
|
593 if (h && *h) |
|
|
594 { |
|
|
595 output_buf << "\n*** " << *argv << ":\n\n" |
|
|
596 << h << "\n"; |
|
|
597 continue; |
|
|
598 } |
|
|
599 } |
|
|
600 |
|
|
601 // Try harder to find function files that might not be defined yet, or |
|
|
602 // that appear to be out of date. Don\'t execute commands from the |
|
|
603 // file if it turns out to be a script file. |
|
|
604 |
|
|
605 fcn_file_name = fcn_file_in_path (*argv); |
|
|
606 if (fcn_file_name) |
|
|
607 { |
|
|
608 sym_rec = global_sym_tab->lookup (*argv, 1, 0); |
|
|
609 if (sym_rec) |
|
|
610 { |
|
|
611 tree_identifier tmp (sym_rec); |
|
|
612 tmp.parse_fcn_file (0); |
|
|
613 char *h = sym_rec->help (); |
|
|
614 if (h && *h) |
|
|
615 { |
|
|
616 output_buf << "\n*** " << *argv << ":\n\n" |
|
|
617 << h << "\n"; |
|
|
618 continue; |
|
|
619 } |
|
|
620 } |
|
|
621 } |
|
|
622 delete [] fcn_file_name; |
|
|
623 |
|
|
624 output_buf << "\nhelp: sorry, `" << *argv |
|
|
625 << "' is not documented\n"; |
|
|
626 } |
|
|
627 |
|
|
628 additional_help_message (output_buf); |
|
|
629 output_buf << ends; |
|
|
630 maybe_page_output (output_buf); |
|
|
631 } |
|
|
632 } |
|
|
633 |
|
|
634 DELETE_ARGV; |
|
|
635 |
|
|
636 return retval; |
|
|
637 } |
|
|
638 |
|
1
|
639 /* |
|
|
640 ;;; Local Variables: *** |
|
|
641 ;;; mode: C++ *** |
|
|
642 ;;; page-delimiter: "^/\\*" *** |
|
|
643 ;;; End: *** |
|
|
644 */ |
