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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include <SLList.h> |
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32 |
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33 #include "defun.h" |
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34 #include "error.h" |
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35 #include "ov.h" |
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36 #include "oct-lvalue.h" |
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37 #include "input.h" |
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38 #include "pager.h" |
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39 #include "pt-cmd.h" |
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40 #include "pt-id.h" |
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41 #include "pt-idx.h" |
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42 #include "pt-jump.h" |
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43 #include "pt-pr-code.h" |
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44 #include "pt-stmt.h" |
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45 #include "pt-walk.h" |
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46 #include "utils.h" |
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47 #include "variables.h" |
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48 |
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49 // If TRUE, turn off printing of results in functions (as if a |
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50 // semicolon has been appended to each statement). |
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51 static bool Vsilent_functions; |
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52 |
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53 // A list of commands to be executed. |
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54 |
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55 tree_statement::~tree_statement (void) |
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56 { |
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57 delete cmd; |
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58 delete expr; |
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59 } |
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60 |
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61 int |
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62 tree_statement::line (void) |
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63 { |
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64 return cmd ? cmd->line () : (expr ? expr->line () : -1); |
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65 } |
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66 |
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67 int |
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68 tree_statement::column (void) |
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69 { |
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70 return cmd ? cmd->column () : (expr ? expr->column () : -1); |
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71 } |
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72 |
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73 void |
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74 tree_statement::maybe_echo_code (bool in_function_body) |
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75 { |
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76 if (in_function_body |
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77 && (Vecho_executing_commands & ECHO_FUNCTIONS)) |
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78 { |
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79 tree_print_code tpc (octave_stdout, Vps4); |
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80 |
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81 accept (tpc); |
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82 } |
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83 } |
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84 |
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85 octave_value_list |
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86 tree_statement::eval (bool silent, int nargout, bool in_function_body) |
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87 { |
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88 octave_value_list retval; |
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89 |
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90 bool pf = silent ? false : print_flag; |
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91 |
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92 if (cmd || expr) |
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93 { |
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94 maybe_echo_code (in_function_body); |
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95 |
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96 if (cmd) |
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97 cmd->eval (); |
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98 else |
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99 { |
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100 expr->set_print_flag (pf); |
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101 |
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102 // XXX FIXME XXX -- maybe all of this should be packaged in |
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103 // one virtual function that returns a flag saying whether |
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104 // or not the expression will take care of binding ans and |
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105 // printing the result. |
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106 |
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107 bool do_bind_ans = false; |
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108 |
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109 if (expr->is_identifier ()) |
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110 { |
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111 bool script_file_executed = false; |
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112 |
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113 tree_identifier *id = static_cast<tree_identifier *> (expr); |
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114 |
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115 id->do_lookup (script_file_executed, false); |
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116 |
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117 do_bind_ans = id->is_function (); |
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118 } |
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119 else |
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120 do_bind_ans = (! (expr->is_indirect_ref () |
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121 || expr->is_assignment_expression ())); |
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122 |
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123 retval = expr->rvalue (nargout); |
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124 |
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125 if (do_bind_ans && ! (error_state || retval.empty ())) |
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126 bind_ans (retval(0), pf); |
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127 } |
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128 } |
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129 |
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130 return retval; |
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131 } |
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132 |
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133 void |
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134 tree_statement::accept (tree_walker& tw) |
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135 { |
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136 tw.visit_statement (*this); |
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137 } |
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138 |
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139 octave_value_list |
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140 tree_statement_list::eval (bool silent, int nargout) |
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141 { |
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142 octave_value_list retval; |
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143 |
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144 if (error_state) |
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145 return retval; |
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146 |
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147 for (Pix p = first (); p != 0; next (p)) |
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148 { |
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149 tree_statement *elt = this->operator () (p); |
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150 |
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151 if (elt) |
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152 { |
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153 bool silent_flag = |
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154 silent ? true : (function_body ? Vsilent_functions : false); |
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155 |
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156 retval = elt->eval (silent_flag, nargout, function_body); |
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157 |
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158 if (error_state) |
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159 break; |
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160 |
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161 if (tree_break_command::breaking |
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162 || tree_continue_command::continuing) |
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163 break; |
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164 |
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165 if (tree_return_command::returning) |
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166 break; |
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167 } |
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168 else |
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169 error ("invalid statement found in statement list!"); |
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170 } |
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171 |
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172 return retval; |
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173 } |
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174 |
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175 void |
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176 tree_statement_list::accept (tree_walker& tw) |
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177 { |
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178 tw.visit_statement_list (*this); |
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179 } |
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180 |
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181 static int |
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182 silent_functions (void) |
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183 { |
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184 Vsilent_functions = check_preference ("silent_functions"); |
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185 |
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186 return 0; |
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187 } |
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188 |
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189 void |
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190 symbols_of_pt_stmt (void) |
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191 { |
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192 DEFVAR (silent_functions, 0.0, silent_functions, |
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193 "-*- texinfo -*-\n\ |
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194 @defvr {Built-in Variable} silent_functions\n\ |
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195 If the value of @code{silent_functions} is nonzero, internal output\n\ |
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196 from a function is suppressed. Otherwise, the results of expressions\n\ |
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197 within a function body that are not terminated with a semicolon will\n\ |
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198 have their values printed. The default value is 0.\n\ |
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199 \n\ |
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200 For example, if the function\n\ |
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201 \n\ |
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202 @example\n\ |
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203 function f ()\n\ |
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204 2 + 2\n\ |
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205 endfunction\n\ |
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206 @end example\n\ |
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207 \n\ |
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208 @noindent\n\ |
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209 is executed, Octave will either print @samp{ans = 4} or nothing\n\ |
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210 depending on the value of @code{silent_functions}.\n\ |
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211 @end defvr"); |
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212 } |
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213 |
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214 /* |
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215 ;;; Local Variables: *** |
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216 ;;; mode: C++ *** |
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217 ;;; End: *** |
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218 */ |
