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577
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1 /* |
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2 |
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2847
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3 Copyright (C) 1996, 1997 John W. Eaton |
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577
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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1315
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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577
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20 |
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21 */ |
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22 |
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1297
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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577
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27 #ifdef HAVE_CONFIG_H |
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1192
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28 #include <config.h> |
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577
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29 #endif |
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30 |
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1350
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31 #include <iostream.h> |
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32 |
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33 #ifdef HAVE_UNISTD_H |
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2442
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34 #ifdef HAVE_SYS_TYPES_H |
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577
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35 #include <sys/types.h> |
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2442
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36 #endif |
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577
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37 #include <unistd.h> |
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38 #endif |
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39 |
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40 #include "error.h" |
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2530
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41 #include "input.h" |
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1352
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42 #include "oct-obj.h" |
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2891
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43 #include "oct-usr-fcn.h" |
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2878
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44 #include "ov.h" |
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1742
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45 #include "pager.h" |
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46 #include "pt-cmd.h" |
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2878
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47 #include "pt-const.h" |
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1742
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48 #include "pt-exp.h" |
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2891
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49 #include "pt-id.h" |
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50 #include "pt-indir.h" |
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1742
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51 #include "pt-misc.h" |
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52 #include "pt-mvr.h" |
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2878
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53 #include "pt-pr-code.h" |
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2124
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54 #include "pt-walk.h" |
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2878
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55 #include "toplev.h" |
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2204
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56 #include "variables.h" |
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577
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57 |
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1058
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58 // Nonzero means we're breaking out of a loop or function body. |
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577
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59 extern int breaking; |
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60 |
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61 // Nonzero means we're jumping to the end of a loop. |
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62 extern int continuing; |
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63 |
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64 // Nonzero means we're returning from a function. |
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65 extern int returning; |
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66 |
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67 // A list of commands to be executed. |
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68 |
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69 tree_statement::~tree_statement (void) |
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70 { |
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2124
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71 delete cmd; |
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72 delete expr; |
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577
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73 } |
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74 |
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1742
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75 int |
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76 tree_statement::line (void) |
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77 { |
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2124
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78 return cmd ? cmd->line () : (expr ? expr->line () : -1); |
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1742
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79 } |
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80 |
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81 int |
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82 tree_statement::column (void) |
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83 { |
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2124
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84 return cmd ? cmd->column () : (expr ? expr->column () : -1); |
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1742
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85 } |
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86 |
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581
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87 void |
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1827
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88 tree_statement::maybe_echo_code (bool in_function_body) |
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1588
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89 { |
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90 if (in_function_body |
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2204
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91 && (Vecho_executing_commands & ECHO_FUNCTIONS)) |
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2124
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92 { |
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2530
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93 tree_print_code tpc (octave_stdout, Vps4); |
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2124
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94 |
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95 accept (tpc); |
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96 } |
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1588
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97 } |
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98 |
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99 void |
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2124
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100 tree_statement::accept (tree_walker& tw) |
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581
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101 { |
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2124
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102 tw.visit_statement (*this); |
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581
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103 } |
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104 |
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2086
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105 octave_value |
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1827
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106 tree_statement_list::eval (bool print) |
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577
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107 { |
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1827
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108 bool pf; |
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2086
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109 octave_value retval; |
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110 |
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111 if (error_state) |
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112 return retval; |
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113 |
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114 for (Pix p = first (); p != 0; next (p)) |
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115 { |
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116 tree_statement *elt = this->operator () (p); |
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117 |
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1827
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118 if (! print) |
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119 pf = false; |
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577
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120 else |
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121 pf = elt->print_flag; |
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122 |
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2124
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123 tree_command *cmd = elt->command (); |
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124 tree_expression *expr = elt->expression (); |
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577
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125 |
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126 if (cmd || expr) |
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127 { |
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1588
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128 elt->maybe_echo_code (function_body); |
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129 |
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577
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130 if (cmd) |
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131 cmd->eval (); |
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132 else |
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133 retval = expr->eval (pf); |
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134 |
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135 if (error_state) |
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2086
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136 return octave_value (); |
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577
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137 |
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138 if (breaking || continuing) |
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139 break; |
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140 |
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141 if (returning) |
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142 break; |
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143 } |
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144 else |
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2086
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145 retval = octave_value (); |
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577
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146 } |
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147 return retval; |
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148 } |
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149 |
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2086
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150 octave_value_list |
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1827
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151 tree_statement_list::eval (bool print, int nargout) |
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672
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152 { |
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2086
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153 octave_value_list retval; |
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672
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154 |
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155 if (nargout > 1) |
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156 { |
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1827
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157 bool pf; |
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672
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158 |
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159 if (error_state) |
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160 return retval; |
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161 |
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162 for (Pix p = first (); p != 0; next (p)) |
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163 { |
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164 tree_statement *elt = this->operator () (p); |
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165 |
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1827
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166 if (! print) |
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167 pf = false; |
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672
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168 else |
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169 pf = elt->print_flag; |
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170 |
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2124
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171 tree_command *cmd = elt->command (); |
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172 tree_expression *expr = elt->expression (); |
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672
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173 |
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174 if (cmd || expr) |
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175 { |
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1588
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176 elt->maybe_echo_code (function_body); |
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177 |
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672
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178 if (cmd) |
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179 cmd->eval (); |
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180 else |
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181 { |
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182 if (expr->is_multi_val_ret_expression ()) |
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183 { |
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2086
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184 octave_value_list args; |
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2800
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185 tree_multi_val_ret *t; |
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186 t = static_cast<tree_multi_val_ret *> (expr); |
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672
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187 retval = t->eval (pf, nargout, args); |
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188 } |
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189 else |
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190 retval = expr->eval (pf); |
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191 } |
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192 |
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193 if (error_state) |
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2086
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194 return octave_value (); |
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672
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195 |
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196 if (breaking || continuing) |
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197 break; |
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198 |
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199 if (returning) |
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200 break; |
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201 } |
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202 else |
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2086
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203 retval = octave_value_list (); |
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672
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204 } |
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205 return retval; |
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206 } |
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207 else |
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208 retval = eval (print); |
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209 |
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210 return retval; |
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211 } |
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212 |
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581
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213 void |
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2124
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214 tree_statement_list::accept (tree_walker& tw) |
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581
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215 { |
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2124
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216 tw.visit_statement_list (*this); |
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581
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217 } |
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218 |
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2878
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219 tree_argument_list::~tree_argument_list (void) |
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220 { |
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221 while (! empty ()) |
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222 { |
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223 tree_expression *t = remove_front (); |
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224 delete t; |
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225 } |
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226 } |
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227 |
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2086
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228 octave_value_list |
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577
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229 tree_argument_list::convert_to_const_vector (void) |
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230 { |
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712
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231 int len = length (); |
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577
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232 |
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1358
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233 // XXX FIXME XXX -- would be nice to know in advance how largs args |
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234 // needs to be even when we have a list containing an all_va_args |
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235 // token. |
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922
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236 |
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2086
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237 octave_value_list args; |
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577
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238 args.resize (len); |
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239 |
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240 Pix p = first (); |
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922
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241 int j = 0; |
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712
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242 for (int k = 0; k < len; k++) |
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577
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243 { |
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244 tree_expression *elt = this->operator () (p); |
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245 if (elt) |
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246 { |
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2859
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247 octave_value tmp = elt->eval (); |
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577
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248 if (error_state) |
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249 { |
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250 ::error ("evaluating argument list element number %d", k); |
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2086
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251 args = octave_value_list (); |
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577
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252 break; |
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253 } |
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922
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254 else |
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255 { |
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256 if (tmp.is_all_va_args ()) |
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257 { |
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258 if (curr_function) |
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259 { |
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2086
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260 octave_value_list tva; |
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922
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261 tva = curr_function->octave_all_va_args (); |
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262 int n = tva.length (); |
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263 for (int i = 0; i < n; i++) |
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264 args(j++) = tva(i); |
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265 } |
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266 else |
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267 { |
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268 ::error ("all_va_args is only valid inside functions"); |
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2086
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269 args = octave_value_list (); |
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922
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270 break; |
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271 } |
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272 } |
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273 else |
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274 args(j++) = tmp; |
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275 } |
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577
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276 next (p); |
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277 } |
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278 else |
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279 { |
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2086
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280 args(j++) = octave_value (); |
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577
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281 break; |
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282 } |
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283 } |
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712
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284 |
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927
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285 args.resize (j); |
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286 |
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577
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287 return args; |
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288 } |
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289 |
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581
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290 void |
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2124
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291 tree_argument_list::accept (tree_walker& tw) |
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581
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292 { |
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2124
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293 tw.visit_argument_list (*this); |
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581
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294 } |
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295 |
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577
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296 // Parameter lists. |
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297 |
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1742
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298 tree_parameter_list::~tree_parameter_list (void) |
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299 { |
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300 while (! empty ()) |
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301 { |
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302 tree_identifier *t = remove_front (); |
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303 delete t; |
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304 } |
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305 } |
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306 |
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577
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307 void |
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308 tree_parameter_list::mark_as_formal_parameters (void) |
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309 { |
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310 for (Pix p = first (); p != 0; next (p)) |
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311 { |
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312 tree_identifier *elt = this->operator () (p); |
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313 elt->mark_as_formal_parameter (); |
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314 } |
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315 } |
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316 |
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317 void |
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2086
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318 tree_parameter_list::initialize_undefined_elements (octave_value& val) |
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1093
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319 { |
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320 for (Pix p = first (); p != 0; next (p)) |
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321 { |
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322 tree_identifier *elt = this->operator () (p); |
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323 if (! elt->is_defined ()) |
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2371
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324 { |
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325 octave_variable_reference tmp (elt); |
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2878
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326 tmp.assign (octave_value::asn_eq, val); |
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2371
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327 } |
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1093
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328 } |
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329 } |
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330 |
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331 void |
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2086
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332 tree_parameter_list::define_from_arg_vector (const octave_value_list& args) |
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577
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333 { |
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712
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334 int nargin = args.length (); |
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335 |
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336 if (nargin <= 0) |
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577
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337 return; |
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338 |
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712
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339 int expected_nargin = length (); |
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577
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340 |
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341 Pix p = first (); |
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342 |
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712
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343 for (int i = 0; i < expected_nargin; i++) |
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577
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344 { |
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345 tree_identifier *elt = this->operator () (p); |
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346 |
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347 if (i < nargin) |
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348 { |
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620
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349 if (args(i).is_defined () && args(i).is_magic_colon ()) |
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577
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350 { |
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351 ::error ("invalid use of colon in function argument list"); |
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352 return; |
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353 } |
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2891
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354 |
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355 elt->define (args(i)); |
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577
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356 } |
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2891
|
357 else |
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358 elt->define (octave_value ()); |
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577
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359 |
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360 next (p); |
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361 } |
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362 } |
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363 |
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2086
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364 octave_value_list |
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723
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365 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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577
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366 { |
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367 int nout = length (); |
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368 |
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723
|
369 if (vr_list) |
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370 nout += vr_list->length (); |
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371 |
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2086
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372 octave_value_list retval; |
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577
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373 retval.resize (nout); |
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374 |
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375 int i = 0; |
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376 |
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377 for (Pix p = first (); p != 0; next (p)) |
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378 { |
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379 tree_identifier *elt = this->operator () (p); |
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380 |
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381 if (elt->is_defined ()) |
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2859
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382 retval(i) = elt->eval (); |
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577
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383 |
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384 i++; |
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385 } |
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386 |
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723
|
387 if (vr_list) |
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388 { |
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1321
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389 for (Pix p = vr_list->first (); p != 0; vr_list->next (p)) |
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723
|
390 { |
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391 retval(i) = vr_list->operator () (p); |
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392 i++; |
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393 } |
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394 } |
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395 |
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577
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396 return retval; |
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397 } |
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398 |
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1827
|
399 bool |
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577
|
400 tree_parameter_list::is_defined (void) |
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401 { |
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1827
|
402 bool status = true; |
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577
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403 |
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404 for (Pix p = first (); p != 0; next (p)) |
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405 { |
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406 tree_identifier *elt = this->operator () (p); |
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407 |
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408 if (! elt->is_defined ()) |
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409 { |
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1827
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410 status = false; |
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577
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411 break; |
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412 } |
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413 } |
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414 |
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415 return status; |
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416 } |
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417 |
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418 void |
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2124
|
419 tree_parameter_list::accept (tree_walker& tw) |
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581
|
420 { |
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2124
|
421 tw.visit_parameter_list (*this); |
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581
|
422 } |
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423 |
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424 // Return lists. |
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425 |
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1742
|
426 tree_return_list::~tree_return_list (void) |
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427 { |
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428 while (! empty ()) |
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429 { |
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430 tree_index_expression *t = remove_front (); |
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|
431 delete t; |
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432 } |
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433 } |
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434 |
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581
|
435 void |
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2124
|
436 tree_return_list::accept (tree_walker& tw) |
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581
|
437 { |
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2124
|
438 tw.visit_return_list (*this); |
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581
|
439 } |
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440 |
|
2846
|
441 // Declarations (global, static, etc.). |
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581
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442 |
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2846
|
443 tree_decl_elt::~tree_decl_elt (void) |
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1742
|
444 { |
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2124
|
445 delete id; |
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|
446 delete ass_expr; |
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1742
|
447 } |
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448 |
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581
|
449 void |
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2846
|
450 tree_decl_elt::accept (tree_walker& tw) |
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577
|
451 { |
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2846
|
452 tw.visit_decl_elt (*this); |
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|
453 } |
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454 |
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|
455 // Initializer lists for declaration statements. |
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456 |
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457 void |
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458 tree_decl_init_list::eval (tree_decl_elt::eval_fcn f, bool skip_init) |
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|
459 { |
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460 for (Pix p = first (); p != 0; next (p)) |
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577
|
461 { |
|
2846
|
462 f (*(this->operator () (p)), skip_init); |
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2124
|
463 |
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2846
|
464 if (error_state) |
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|
465 break; |
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577
|
466 } |
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|
467 } |
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468 |
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469 void |
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2846
|
470 tree_decl_init_list::accept (tree_walker& tw) |
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577
|
471 { |
|
2846
|
472 tw.visit_decl_init_list (*this); |
|
581
|
473 } |
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|
474 |
|
|
475 // If. |
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|
476 |
|
1742
|
477 tree_if_clause::~tree_if_clause (void) |
|
|
478 { |
|
|
479 delete expr; |
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|
480 delete list; |
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|
481 } |
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|
482 |
|
577
|
483 int |
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|
484 tree_if_clause::eval (void) |
|
|
485 { |
|
1491
|
486 if (is_else_clause () || expr->is_logically_true ("if")) |
|
577
|
487 { |
|
|
488 if (list) |
|
1827
|
489 list->eval (true); |
|
577
|
490 |
|
|
491 return 1; |
|
|
492 } |
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|
493 |
|
|
494 return 0; |
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|
495 } |
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|
496 |
|
|
497 void |
|
2124
|
498 tree_if_clause::accept (tree_walker& tw) |
|
581
|
499 { |
|
2124
|
500 tw.visit_if_clause (*this); |
|
581
|
501 } |
|
|
502 |
|
|
503 // List of if commands. |
|
|
504 |
|
|
505 void |
|
577
|
506 tree_if_command_list::eval (void) |
|
|
507 { |
|
|
508 for (Pix p = first (); p != 0; next (p)) |
|
|
509 { |
|
|
510 tree_if_clause *t = this->operator () (p); |
|
|
511 |
|
|
512 if (t->eval () || error_state) |
|
|
513 break; |
|
|
514 } |
|
|
515 } |
|
|
516 |
|
581
|
517 void |
|
2124
|
518 tree_if_command_list::accept (tree_walker& tw) |
|
581
|
519 { |
|
2124
|
520 tw.visit_if_command_list (*this); |
|
581
|
521 } |
|
|
522 |
|
2764
|
523 // Switch. |
|
|
524 |
|
|
525 tree_switch_case::~tree_switch_case (void) |
|
|
526 { |
|
|
527 delete label; |
|
|
528 delete list; |
|
|
529 } |
|
|
530 |
|
|
531 bool |
|
|
532 tree_switch_case::label_matches (const octave_value& val) |
|
|
533 { |
|
|
534 bool retval = false; |
|
|
535 |
|
2859
|
536 octave_value label_value = label->eval (); |
|
2764
|
537 |
|
|
538 if (! error_state) |
|
|
539 { |
|
|
540 if (label_value.is_defined ()) |
|
|
541 { |
|
|
542 octave_value tmp = do_binary_op (octave_value::eq, |
|
|
543 val, label_value); |
|
|
544 |
|
|
545 if (! error_state) |
|
|
546 { |
|
|
547 if (tmp.is_defined ()) |
|
|
548 retval = tmp.is_true (); |
|
|
549 else |
|
|
550 eval_error (); |
|
|
551 } |
|
|
552 else |
|
|
553 eval_error (); |
|
|
554 } |
|
|
555 else |
|
|
556 eval_error (); |
|
|
557 } |
|
|
558 else |
|
|
559 eval_error (); |
|
|
560 |
|
|
561 return retval; |
|
|
562 } |
|
|
563 |
|
|
564 int |
|
|
565 tree_switch_case::eval (const octave_value& val) |
|
|
566 { |
|
|
567 int retval = 0; |
|
|
568 |
|
|
569 if (is_default_case () || label_matches (val)) |
|
|
570 { |
|
|
571 if (list) |
|
|
572 list->eval (true); |
|
|
573 |
|
|
574 retval = 1; |
|
|
575 } |
|
|
576 |
|
|
577 return retval; |
|
|
578 } |
|
|
579 |
|
|
580 void |
|
|
581 tree_switch_case::eval_error (void) |
|
|
582 { |
|
|
583 ::error ("evaluating switch case label"); |
|
|
584 } |
|
|
585 |
|
|
586 void |
|
|
587 tree_switch_case::accept (tree_walker& tw) |
|
|
588 { |
|
|
589 tw.visit_switch_case (*this); |
|
|
590 } |
|
|
591 |
|
|
592 // List of switch cases. |
|
|
593 |
|
|
594 void |
|
|
595 tree_switch_case_list::eval (const octave_value& val) |
|
|
596 { |
|
|
597 for (Pix p = first (); p != 0; next (p)) |
|
|
598 { |
|
|
599 tree_switch_case *t = this->operator () (p); |
|
|
600 |
|
|
601 if (t->eval (val) || error_state) |
|
|
602 break; |
|
|
603 } |
|
|
604 } |
|
|
605 |
|
|
606 void |
|
|
607 tree_switch_case_list::accept (tree_walker& tw) |
|
|
608 { |
|
|
609 tw.visit_switch_case_list (*this); |
|
|
610 } |
|
|
611 |
|
577
|
612 /* |
|
|
613 ;;; Local Variables: *** |
|
|
614 ;;; mode: C++ *** |
|
|
615 ;;; End: *** |
|
|
616 */ |
