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1 // input.cc -*- C++ -*- |
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2 /* |
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3 |
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1009
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4 Copyright (C) 1992, 1993, 1994, 1995 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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661
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24 /* |
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25 |
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26 The 3 functions listed below were adapted from similar functions |
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27 from GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 |
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28 Free Software Foundation, Inc. |
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29 |
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30 read_octal sub_append_string decode_prompt_string |
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31 |
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32 */ |
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33 |
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1
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34 // Use the GNU readline library for command line editing and hisory. |
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35 |
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240
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36 #ifdef HAVE_CONFIG_H |
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37 #include "config.h" |
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1
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38 #endif |
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39 |
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529
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40 #include <sys/types.h> |
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41 #ifdef HAVE_UNISTD_H |
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42 #include <unistd.h> |
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43 #endif |
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44 #include <time.h> |
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1
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45 #include <stdio.h> |
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46 #include <stdlib.h> |
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195
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47 #include <iostream.h> |
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1044
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48 #include <strstream.h> |
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188
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49 #include <string.h> |
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1
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50 #include <assert.h> |
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836
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51 #include <signal.h> |
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52 |
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53 // This must come before anything that includes iostream.h... |
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54 extern "C" |
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55 { |
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56 #include "readline/readline.h" |
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269
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57 #include "readline/history.h" |
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1
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58 |
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271
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59 extern void free_undo_list (); |
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60 |
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252
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61 extern char *xmalloc (); |
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62 |
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581
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63 // Yes, this sucks, but it avoids a conflict with another readline |
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64 // function declared in iostream.h. |
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65 |
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1
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66 #if 0 |
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67 #define LINE_SIZE 8192 |
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529
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68 static int no_line_editing = 0; |
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1
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69 #endif |
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70 |
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71 char * |
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72 gnu_readline (char *s) |
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73 { |
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74 #if 0 |
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75 static int state = 0; |
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529
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76 static char *line_from_stdin = 0; |
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1
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77 if (no_line_editing) |
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78 { |
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79 if (! state) |
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80 { |
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81 line_from_stdin = (char *) malloc (LINE_SIZE); |
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82 state = 1; |
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83 } |
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84 fputs ("octave> ", stdout); |
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85 fgets (line_from_stdin, LINE_SIZE, stdin); |
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86 return line_from_stdin; |
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87 } |
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88 else |
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89 #endif |
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90 return readline (s); |
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91 } |
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92 } |
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93 |
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529
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94 #include "help.h" |
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1
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95 #include "error.h" |
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96 #include "utils.h" |
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97 #include "input.h" |
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98 #include "pager.h" |
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529
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99 #include "parse.h" |
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100 #include "dirfns.h" |
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101 #include "octave.h" |
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1114
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102 #include "sysdep.h" |
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529
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103 #include "variables.h" |
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104 #include "tree-const.h" |
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1
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105 #include "octave-hist.h" |
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106 #include "sighandlers.h" |
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107 #include "user-prefs.h" |
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529
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108 #include "oct-obj.h" |
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109 #include "defun.h" |
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110 |
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111 #ifndef MAXPATHLEN |
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112 #define MAXPATHLEN 1024 |
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113 #endif |
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114 |
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115 // The size that strings change by. |
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116 #ifndef DEFAULT_ARRAY_SIZE |
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117 #define DEFAULT_ARRAY_SIZE 512 |
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118 #endif |
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119 |
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120 // The growth rate for the prompt string. |
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121 #ifndef PROMPT_GROWTH |
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122 #define PROMPT_GROWTH 50 |
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123 #endif |
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124 |
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125 // Global pointer for eval(). |
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529
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126 const char *current_eval_string = 0; |
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127 |
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128 // Nonzero means get input from current_eval_string. |
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129 int get_input_from_eval_string = 0; |
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130 |
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338
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131 // Nonzero means we're parsing a function file. |
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132 int reading_fcn_file = 0; |
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1
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133 |
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338
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134 // Simple name of function file we are reading. |
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529
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135 char *curr_fcn_file_name = 0; |
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1
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136 |
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137 // Nonzero means we're parsing a script file. |
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138 int reading_script_file = 0; |
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139 |
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140 // If we are reading from an M-file, this is it. |
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529
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141 FILE *ff_instream = 0; |
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1
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142 |
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143 // Nonzero means we are using readline. |
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144 int using_readline = 1; |
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145 |
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616
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146 // Nonzero means commands are echoed as they are executed. |
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147 // (--echo-commands; -x). |
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1
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148 int echo_input = 0; |
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149 |
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150 // Nonzero means this is an interactive shell. |
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151 int interactive = 0; |
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152 |
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153 // Nonzero means the user forced this shell to be interactive (-i). |
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154 int forced_interactive = 0; |
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155 |
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156 // Should we issue a prompt? |
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157 int promptflag = 1; |
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158 |
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159 // The current line of input, from wherever. |
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529
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160 char *current_input_line = 0; |
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1
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161 |
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162 // A line of input from readline. |
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529
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163 static char *octave_gets_line = 0; |
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164 |
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165 extern tree_constant eval_string (const char *string, int print, |
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166 int ans_assign, int& parse_status); |
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167 |
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581
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168 // Append SOURCE to TARGET at INDEX. SIZE is the current amount of |
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169 // space allocated to TARGET. SOURCE can be NULL, in which case |
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170 // nothing happens. Gets rid of SOURCE by free ()ing it. Returns |
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171 // TARGET in case the location has changed. |
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172 |
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529
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173 static char * |
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174 sub_append_string (char *source, char *target, int *index, int *size) |
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175 { |
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176 if (source) |
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177 { |
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178 while ((int)strlen (source) >= (int)(*size - *index)) |
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179 { |
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180 char *tmp = new char [*size += DEFAULT_ARRAY_SIZE]; |
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181 strcpy (tmp, target); |
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182 delete [] target; |
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183 target = tmp; |
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184 } |
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185 |
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186 strcat (target, source); |
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187 *index += strlen (source); |
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188 |
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189 delete [] source; |
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190 } |
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191 return target; |
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192 } |
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193 |
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581
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194 // Return the octal number parsed from STRING, or -1 to indicate that |
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195 // the string contained a bad number. |
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196 |
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529
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197 int |
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198 read_octal (const char *string) |
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199 { |
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200 int result = 0; |
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201 int digits = 0; |
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202 |
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203 while (*string && *string >= '0' && *string < '8') |
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204 { |
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205 digits++; |
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206 result = (result * 8) + *string++ - '0'; |
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207 } |
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208 |
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209 if (! digits || result > 0777 || *string) |
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210 result = -1; |
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211 |
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212 return result; |
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213 } |
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214 |
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581
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215 // Return a string which will be printed as a prompt. The string may |
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216 // contain special characters which are decoded as follows: |
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217 // |
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218 // \t the time |
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219 // \d the date |
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220 // \n CRLF |
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221 // \s the name of the shell (program) |
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222 // \w the current working directory |
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223 // \W the last element of PWD |
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224 // \u your username |
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225 // \h the hostname |
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226 // \# the command number of this command |
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227 // \! the history number of this command |
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228 // \$ a $ or a # if you are root |
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229 // \<octal> character code in octal |
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230 // \\ a backslash |
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231 |
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529
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232 static char * |
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233 decode_prompt_string (const char *string) |
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234 { |
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235 int result_size = PROMPT_GROWTH; |
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236 int result_index = 0; |
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237 char *result = new char [PROMPT_GROWTH]; |
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238 int c; |
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239 char *temp = 0; |
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240 |
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241 result[0] = 0; |
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242 while (c = *string++) |
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243 { |
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244 if (c == '\\') |
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245 { |
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246 c = *string; |
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247 |
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248 switch (c) |
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249 { |
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250 case '0': |
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251 case '1': |
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252 case '2': |
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253 case '3': |
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254 case '4': |
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255 case '5': |
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256 case '6': |
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257 case '7': |
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258 { |
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259 char octal_string[4]; |
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260 int n; |
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261 |
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262 strncpy (octal_string, string, 3); |
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263 octal_string[3] = '\0'; |
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264 |
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265 n = read_octal (octal_string); |
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266 |
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267 temp = strsave ("\\"); |
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268 if (n != -1) |
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269 { |
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270 string += 3; |
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271 temp[0] = n; |
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272 } |
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273 |
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274 c = 0; |
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275 goto add_string; |
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276 } |
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277 |
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278 case 't': |
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279 case 'd': |
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280 /* Make the current time/date into a string. */ |
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281 { |
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282 time_t the_time = time (0); |
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283 char *ttemp = ctime (&the_time); |
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284 temp = strsave (ttemp); |
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285 |
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286 if (c == 't') |
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287 { |
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288 strcpy (temp, temp + 11); |
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289 temp[8] = '\0'; |
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290 } |
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291 else |
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292 temp[10] = '\0'; |
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293 |
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294 goto add_string; |
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295 } |
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1
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296 |
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529
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297 case 'n': |
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298 if (! no_line_editing) |
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299 temp = strsave ("\r\n"); |
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300 else |
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301 temp = strsave ("\n"); |
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302 goto add_string; |
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303 |
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304 case 's': |
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305 { |
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306 temp = base_pathname (prog_name); |
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307 temp = strsave (temp); |
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308 goto add_string; |
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309 } |
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310 |
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311 case 'w': |
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312 case 'W': |
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313 { |
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314 char t_string[MAXPATHLEN]; |
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315 #define EFFICIENT |
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316 #ifdef EFFICIENT |
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317 |
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318 // Use the value of PWD because it is much more effecient. |
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319 |
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320 temp = user_pref.pwd; |
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321 |
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322 if (! temp) |
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1112
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323 octave_getcwd (t_string, MAXPATHLEN); |
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529
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324 else |
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325 strcpy (t_string, temp); |
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326 #else |
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1112
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327 octave_getcwd (t_string, MAXPATHLEN); |
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529
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328 #endif /* EFFICIENT */ |
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329 |
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330 if (c == 'W') |
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331 { |
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332 char *dir = strrchr (t_string, '/'); |
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333 if (dir && dir != t_string) |
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334 strcpy (t_string, dir + 1); |
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335 temp = strsave (t_string); |
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336 } |
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337 else |
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338 temp = strsave (polite_directory_format (t_string)); |
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339 goto add_string; |
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340 } |
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341 |
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342 case 'u': |
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343 { |
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344 temp = strsave (user_name); |
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345 |
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346 goto add_string; |
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347 } |
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348 |
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349 case 'h': |
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350 { |
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351 char *t_string; |
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352 |
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353 temp = strsave (host_name); |
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354 if (t_string = strchr (temp, '.')) |
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355 *t_string = '\0'; |
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356 |
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357 goto add_string; |
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358 } |
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359 |
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360 case '#': |
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361 { |
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362 char number_buffer[128]; |
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363 sprintf (number_buffer, "%d", current_command_number); |
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364 temp = strsave (number_buffer); |
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365 goto add_string; |
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366 } |
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367 |
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368 case '!': |
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369 { |
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370 char number_buffer[128]; |
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371 int num = current_history_number (); |
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372 if (num > 0) |
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373 sprintf (number_buffer, "%d", num); |
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374 else |
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375 strcpy (number_buffer, "!"); |
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376 temp = strsave (number_buffer); |
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377 goto add_string; |
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378 } |
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379 |
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380 case '$': |
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381 temp = strsave (geteuid () == 0 ? "#" : "$"); |
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382 goto add_string; |
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383 |
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384 case '\\': |
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385 temp = strsave ("\\"); |
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386 goto add_string; |
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387 |
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388 default: |
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389 temp = strsave ("\\ "); |
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390 temp[1] = c; |
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391 |
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392 add_string: |
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393 if (c) |
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394 string++; |
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395 result = |
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396 (char *)sub_append_string (temp, result, |
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397 &result_index, &result_size); |
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581
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398 temp = 0; // Free ()'ed in sub_append_string (). |
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529
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399 result[result_index] = '\0'; |
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400 break; |
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401 } |
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402 } |
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403 else |
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404 { |
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405 while (3 + result_index > result_size) |
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406 { |
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407 char *tmp = new char [result_size += PROMPT_GROWTH]; |
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408 strcpy (tmp, result); |
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409 delete [] result; |
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410 result = tmp; |
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411 } |
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412 result[result_index++] = c; |
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413 result[result_index] = '\0'; |
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414 } |
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415 } |
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416 |
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417 #if 0 |
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581
|
418 // I don't really think that this is a good idea. Do you? |
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529
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419 if (! find_variable ("NO_PROMPT_VARS")) |
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420 { |
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421 WORD_LIST *expand_string (), *list; |
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422 char *string_list (); |
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423 |
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424 list = expand_string (result, 1); |
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425 free (result); |
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426 result = string_list (list); |
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427 dispose_words (list); |
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428 } |
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429 #endif |
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430 |
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431 return result; |
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432 } |
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581
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433 |
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1044
|
434 static void |
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435 do_input_echo (const char *input_string) |
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436 { |
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437 if (echo_input) |
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438 { |
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439 ostrstream buf; |
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440 |
|
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441 if (! forced_interactive) |
|
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442 { |
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443 char *prefix = decode_prompt_string (user_pref.ps4); |
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444 buf << prefix; |
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445 delete [] prefix; |
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446 } |
|
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447 |
|
|
448 if (input_string) |
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449 { |
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450 buf << input_string; |
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451 int len = strlen (input_string); |
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452 if (input_string[len-1] != '\n') |
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453 buf << "\n"; |
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|
454 } |
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455 |
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456 maybe_page_output (buf); |
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457 } |
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458 } |
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459 |
|
|
460 |
|
581
|
461 // Use GNU readline to get an input line and store it in the history |
|
|
462 // list. |
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|
463 |
|
287
|
464 static char * |
|
1
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465 octave_gets (void) |
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466 { |
|
529
|
467 if (octave_gets_line) |
|
126
|
468 { |
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469 free (octave_gets_line); |
|
529
|
470 octave_gets_line = 0; |
|
126
|
471 } |
|
1
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472 |
|
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473 if (interactive || forced_interactive) |
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|
474 { |
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475 char *ps = (promptflag > 0) ? user_pref.ps1 : user_pref.ps2; |
|
|
476 char *prompt = decode_prompt_string (ps); |
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477 |
|
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478 if (interactive) |
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|
479 { |
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480 pipe_handler_error_count = 0; |
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|
481 flush_output_to_pager (); |
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|
482 } |
|
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483 |
|
581
|
484 maybe_write_to_diary_file (prompt); |
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|
485 |
|
1
|
486 octave_gets_line = gnu_readline (prompt); |
|
581
|
487 |
|
1
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488 delete [] prompt; |
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|
489 } |
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490 else |
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|
491 octave_gets_line = gnu_readline (""); |
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|
492 |
|
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493 current_input_line = octave_gets_line; |
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|
494 |
|
|
495 if (octave_gets_line && *octave_gets_line) |
|
|
496 { |
|
|
497 maybe_save_history (octave_gets_line); |
|
|
498 |
|
581
|
499 maybe_write_to_diary_file (octave_gets_line); |
|
|
500 |
|
1044
|
501 do_input_echo (octave_gets_line); |
|
1
|
502 } |
|
581
|
503 |
|
|
504 maybe_write_to_diary_file ("\n"); |
|
|
505 |
|
1
|
506 return octave_gets_line; |
|
|
507 } |
|
|
508 |
|
581
|
509 // Read a line from the input stream. |
|
|
510 |
|
269
|
511 int |
|
1
|
512 octave_read (char *buf, int max_size) |
|
|
513 { |
|
|
514 int status = 0; |
|
|
515 |
|
529
|
516 static char *stashed_line = 0; |
|
1
|
517 |
|
|
518 if (get_input_from_eval_string) |
|
|
519 { |
|
|
520 int len = strlen (current_eval_string); |
|
|
521 if (len < max_size - 1) |
|
|
522 { |
|
|
523 strcpy (buf, current_eval_string); |
|
|
524 buf[len++] = '\n'; |
|
|
525 buf[len] = '\0'; // Paranoia. |
|
|
526 status = len; |
|
|
527 } |
|
|
528 else |
|
|
529 status = -1; |
|
|
530 |
|
|
531 if (stashed_line) |
|
|
532 delete [] stashed_line; |
|
|
533 |
|
|
534 stashed_line = strsave (buf); |
|
|
535 current_input_line = stashed_line; |
|
|
536 } |
|
|
537 else if (using_readline) |
|
|
538 { |
|
|
539 char *cp = octave_gets (); |
|
529
|
540 if (cp) |
|
1
|
541 { |
|
|
542 int len = strlen (cp); |
|
|
543 if (len >= max_size) |
|
|
544 status = -1; |
|
|
545 else |
|
|
546 { |
|
|
547 strcpy (buf, cp); |
|
|
548 buf[len++] = '\n'; |
|
|
549 buf[len] = '\0'; // Paranoia. |
|
|
550 status = len; |
|
|
551 } |
|
|
552 } |
|
|
553 current_input_line = cp; |
|
|
554 } |
|
|
555 else |
|
|
556 { |
|
|
557 FILE *curr_stream = rl_instream; |
|
338
|
558 if (reading_fcn_file || reading_script_file) |
|
339
|
559 curr_stream = ff_instream; |
|
1
|
560 |
|
529
|
561 assert (curr_stream); |
|
1
|
562 |
|
|
563 // Why is this required? |
|
|
564 buf[0] = '\0'; |
|
|
565 |
|
529
|
566 if (fgets (buf, max_size, curr_stream)) |
|
1
|
567 { |
|
|
568 int len = strlen (buf); |
|
|
569 if (len > max_size - 2) |
|
|
570 status = -1; |
|
|
571 else |
|
|
572 { |
|
|
573 if (buf[len-1] != '\n') |
|
|
574 { |
|
|
575 buf[len++] = '\n'; |
|
|
576 buf[len] = '\0'; |
|
|
577 } |
|
|
578 status = len; |
|
|
579 } |
|
|
580 } |
|
|
581 else |
|
|
582 status = 0; // Tell yylex that we found EOF. |
|
|
583 |
|
|
584 if (stashed_line) |
|
|
585 delete [] stashed_line; |
|
|
586 |
|
|
587 stashed_line = strsave (buf); |
|
1044
|
588 |
|
1
|
589 current_input_line = stashed_line; |
|
287
|
590 |
|
1044
|
591 do_input_echo (current_input_line); |
|
|
592 } |
|
287
|
593 |
|
1
|
594 input_line_number++; |
|
1044
|
595 |
|
1
|
596 return status; |
|
|
597 } |
|
|
598 |
|
581
|
599 // Fix things up so that input can come from file `name', printing a |
|
|
600 // warning if the file doesn't exist. |
|
|
601 |
|
1
|
602 FILE * |
|
529
|
603 get_input_from_file (char *name, int warn) |
|
1
|
604 { |
|
529
|
605 FILE *instream = 0; |
|
1
|
606 |
|
|
607 if (name && *name) |
|
|
608 instream = fopen (name, "r"); |
|
|
609 |
|
529
|
610 if (! instream && warn) |
|
217
|
611 warning ("%s: no such file or directory", name); |
|
1
|
612 |
|
338
|
613 if (reading_fcn_file || reading_script_file) |
|
339
|
614 ff_instream = instream; |
|
1
|
615 else |
|
|
616 rl_instream = instream; |
|
|
617 |
|
|
618 return instream; |
|
|
619 } |
|
|
620 |
|
581
|
621 // Fix things up so that input can come from the standard input. This |
|
|
622 // may need to become much more complicated, which is why it's in a |
|
|
623 // separate function. |
|
|
624 |
|
1
|
625 FILE * |
|
|
626 get_input_from_stdin (void) |
|
|
627 { |
|
|
628 rl_instream = stdin; |
|
|
629 return rl_instream; |
|
|
630 } |
|
|
631 |
|
269
|
632 static char * |
|
1
|
633 command_generator (char *text, int state) |
|
|
634 { |
|
|
635 static int len = 0; |
|
|
636 static int list_index = 0; |
|
|
637 |
|
529
|
638 static char **name_list = 0; |
|
1
|
639 |
|
|
640 if (state == 0) |
|
|
641 { |
|
|
642 list_index = 0; |
|
|
643 len = strlen (text); |
|
|
644 |
|
529
|
645 if (name_list) |
|
244
|
646 { |
|
|
647 char **ptr = name_list; |
|
|
648 while (ptr && *ptr) |
|
|
649 delete [] *ptr++; |
|
|
650 delete [] name_list; |
|
|
651 } |
|
1
|
652 |
|
|
653 name_list = make_name_list (); |
|
|
654 } |
|
|
655 |
|
|
656 char *name; |
|
529
|
657 while ((name = name_list[list_index]) != 0) |
|
1
|
658 { |
|
|
659 list_index++; |
|
|
660 if (strncmp (name, text, len) == 0) |
|
244
|
661 { |
|
|
662 char *buf = xmalloc (1 + strlen (name)); |
|
|
663 strcpy (buf, name); |
|
|
664 return buf; |
|
|
665 } |
|
1
|
666 } |
|
|
667 |
|
529
|
668 return 0; |
|
1
|
669 } |
|
|
670 |
|
269
|
671 static char ** |
|
1
|
672 command_completer (char *text, int start, int end) |
|
|
673 { |
|
529
|
674 char **matches = 0; |
|
1
|
675 matches = completion_matches (text, command_generator); |
|
|
676 return matches; |
|
|
677 } |
|
|
678 |
|
581
|
679 // The next two functions implement the equivalent of the K*rn shell |
|
|
680 // C-o operate-and-get-next-history-line editing command. Stolen from |
|
|
681 // the GNU Bourne Again SHell. |
|
269
|
682 |
|
|
683 // ?? |
|
|
684 static int saved_history_line_to_use = 0; |
|
|
685 |
|
|
686 // ?? |
|
529
|
687 static Function *old_rl_startup_hook = 0; |
|
269
|
688 |
|
|
689 static void |
|
|
690 set_saved_history (void) |
|
|
691 { |
|
|
692 HIST_ENTRY *h; |
|
|
693 |
|
|
694 if (saved_history_line_to_use) |
|
|
695 { |
|
|
696 if (history_set_pos (saved_history_line_to_use)) |
|
|
697 { |
|
|
698 h = current_history (); |
|
|
699 if (h) |
|
|
700 { |
|
|
701 rl_insert_text (h->line); |
|
|
702 |
|
|
703 // Get rid of any undo list created by the previous insert, so the |
|
|
704 // line won't totally be erased when the edits are undone (they will |
|
|
705 // be normally, because this is a history line -- cf. readline.c: |
|
|
706 // line 380 or so). |
|
|
707 if (rl_undo_list) |
|
|
708 { |
|
|
709 free_undo_list (); |
|
529
|
710 rl_undo_list = 0; |
|
269
|
711 } |
|
|
712 } |
|
|
713 } |
|
|
714 } |
|
|
715 saved_history_line_to_use = 0; |
|
|
716 rl_startup_hook = old_rl_startup_hook; |
|
|
717 } |
|
|
718 |
|
|
719 static void |
|
|
720 operate_and_get_next (int count, int c) |
|
|
721 { |
|
|
722 int where; |
|
|
723 extern int history_stifled, history_length, max_input_history; |
|
|
724 |
|
581
|
725 // Accept the current line. |
|
269
|
726 rl_newline (); |
|
|
727 |
|
581
|
728 // Find the current line, and find the next line to use. |
|
269
|
729 where = where_history (); |
|
|
730 |
|
|
731 if (history_stifled && (history_length >= max_input_history)) |
|
|
732 saved_history_line_to_use = where; |
|
|
733 else |
|
|
734 saved_history_line_to_use = where + 1; |
|
|
735 |
|
|
736 old_rl_startup_hook = rl_startup_hook; |
|
|
737 rl_startup_hook = (Function *) set_saved_history; |
|
|
738 } |
|
|
739 |
|
1
|
740 void |
|
|
741 initialize_readline (void) |
|
|
742 { |
|
|
743 // Allow conditional parsing of the ~/.inputrc file |
|
|
744 rl_readline_name = "Octave"; |
|
|
745 |
|
|
746 // Tell the completer that we want to try first. |
|
271
|
747 rl_attempted_completion_function = (CPPFunction *) command_completer; |
|
269
|
748 |
|
|
749 // Bind operate-and-get-next. |
|
|
750 rl_add_defun ("operate-and-get-next", |
|
|
751 (Function *) operate_and_get_next, CTRL ('O')); |
|
1
|
752 } |
|
|
753 |
|
529
|
754 static int |
|
|
755 match_sans_spaces (const char *standard, const char *test) |
|
|
756 { |
|
1034
|
757 char *tmp = strsave (test); |
|
|
758 |
|
|
759 char *tp = tmp; |
|
529
|
760 while (*tp == ' ' || *tp == '\t') |
|
|
761 tp++; |
|
|
762 |
|
1125
|
763 char *ep = tmp + strlen (tmp) - 1; |
|
529
|
764 while (*ep == ' ' || *ep == '\t') |
|
|
765 ep--; |
|
|
766 |
|
1034
|
767 *(ep+1) = '\0'; |
|
|
768 |
|
|
769 int retval = strcmp (standard, tp) == 0; |
|
529
|
770 |
|
1034
|
771 delete [] tmp; |
|
|
772 |
|
|
773 return retval; |
|
|
774 |
|
529
|
775 } |
|
|
776 |
|
581
|
777 // If the user simply hits return, this will produce an empty matrix. |
|
|
778 |
|
529
|
779 static Octave_object |
|
|
780 get_user_input (const Octave_object& args, int nargout, int debug = 0) |
|
|
781 { |
|
|
782 tree_constant retval; |
|
|
783 |
|
|
784 int nargin = args.length (); |
|
|
785 |
|
|
786 int read_as_string = 0; |
|
|
787 |
|
712
|
788 if (nargin == 2) |
|
529
|
789 read_as_string++; |
|
|
790 |
|
|
791 char *prompt = "debug> "; |
|
712
|
792 if (nargin > 0) |
|
529
|
793 { |
|
712
|
794 prompt = args(0).string_value (); |
|
636
|
795 |
|
|
796 if (error_state) |
|
|
797 { |
|
|
798 error ("input: unrecognized argument"); |
|
|
799 return retval; |
|
|
800 } |
|
529
|
801 } |
|
|
802 |
|
|
803 again: |
|
|
804 |
|
|
805 flush_output_to_pager (); |
|
|
806 |
|
|
807 char *input_buf = gnu_readline (prompt); |
|
|
808 |
|
|
809 if (input_buf) |
|
|
810 { |
|
|
811 maybe_save_history (input_buf); |
|
|
812 |
|
|
813 int len = strlen (input_buf); |
|
|
814 |
|
|
815 if (len < 1) |
|
|
816 { |
|
|
817 if (debug) |
|
|
818 goto again; |
|
|
819 else |
|
963
|
820 { |
|
|
821 if (read_as_string) |
|
|
822 return ""; |
|
|
823 else |
|
|
824 return Matrix (); |
|
|
825 } |
|
529
|
826 } |
|
|
827 |
|
|
828 if (match_sans_spaces ("exit", input_buf) |
|
|
829 || match_sans_spaces ("quit", input_buf) |
|
|
830 || match_sans_spaces ("return", input_buf)) |
|
963
|
831 { |
|
|
832 return retval; |
|
|
833 } |
|
529
|
834 else if (read_as_string) |
|
963
|
835 { |
|
|
836 retval = input_buf; |
|
|
837 } |
|
529
|
838 else |
|
|
839 { |
|
|
840 int parse_status = 0; |
|
|
841 retval = eval_string (input_buf, 0, 0, parse_status); |
|
581
|
842 if (retval.is_defined ()) |
|
|
843 { |
|
|
844 if (debug) |
|
|
845 retval.eval (1); |
|
|
846 } |
|
|
847 else |
|
963
|
848 retval = Matrix (); |
|
529
|
849 } |
|
|
850 } |
|
|
851 else |
|
|
852 error ("input: reading user-input failed!"); |
|
|
853 |
|
|
854 if (debug) |
|
|
855 goto again; |
|
|
856 |
|
|
857 return retval; |
|
|
858 } |
|
|
859 |
|
712
|
860 DEFUN ("input", Finput, Sinput, 2, 1, |
|
529
|
861 "input (PROMPT [, S])\n\ |
|
|
862 \n\ |
|
|
863 Prompt user for input. If the second argument is present, return |
|
|
864 value as a string.") |
|
|
865 { |
|
|
866 Octave_object retval; |
|
|
867 |
|
|
868 int nargin = args.length (); |
|
|
869 |
|
712
|
870 if (nargin == 1 || nargin == 2) |
|
529
|
871 retval = get_user_input (args, nargout); |
|
|
872 else |
|
|
873 print_usage ("input"); |
|
|
874 |
|
|
875 return retval; |
|
|
876 } |
|
|
877 |
|
712
|
878 DEFUN ("keyboard", Fkeyboard, Skeyboard, 1, 1, |
|
529
|
879 "keyboard (PROMPT)\n\ |
|
|
880 \n\ |
|
|
881 maybe help in debugging function files") |
|
|
882 { |
|
|
883 Octave_object retval; |
|
|
884 |
|
|
885 int nargin = args.length (); |
|
|
886 |
|
712
|
887 if (nargin == 0 || nargin == 1) |
|
529
|
888 retval = get_user_input (args, nargout, 1); |
|
|
889 else |
|
|
890 print_usage ("keyboard"); |
|
|
891 |
|
|
892 return retval; |
|
|
893 } |
|
|
894 |
|
1
|
895 /* |
|
|
896 ;;; Local Variables: *** |
|
|
897 ;;; mode: C++ *** |
|
|
898 ;;; page-delimiter: "^/\\*" *** |
|
|
899 ;;; End: *** |
|
|
900 */ |
