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577
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1 // tree-misc.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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577
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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1297
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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577
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28 #ifdef HAVE_CONFIG_H |
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1192
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29 #include <config.h> |
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577
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30 #endif |
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31 |
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32 #include <iostream.h> |
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1588
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33 #include <strstream.h> |
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34 |
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35 #ifdef HAVE_UNISTD_H |
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577
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36 #include <sys/types.h> |
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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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1352
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41 #include "oct-obj.h" |
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1670
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42 #include "toplev.h" |
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1588
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43 #include "pager.h" |
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1352
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44 #include "tree-base.h" |
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45 #include "tree-cmd.h" |
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577
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46 #include "tree-const.h" |
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1352
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47 #include "tree-expr.h" |
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48 #include "tree-misc.h" |
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577
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49 #include "user-prefs.h" |
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50 |
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1058
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51 // Nonzero means we're breaking out of a loop or function body. |
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577
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52 extern int breaking; |
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53 |
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54 // Nonzero means we're jumping to the end of a loop. |
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55 extern int continuing; |
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56 |
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57 // Nonzero means we're returning from a function. |
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58 extern int returning; |
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59 |
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60 // A list of commands to be executed. |
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61 |
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62 tree_statement::~tree_statement (void) |
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63 { |
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64 delete command; |
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65 delete expression; |
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66 } |
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67 |
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581
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68 void |
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1588
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69 tree_statement::maybe_echo_code (int in_function_body) |
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70 { |
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71 if (in_function_body |
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72 && (user_pref.echo_executing_commands & ECHO_FUNCTIONS)) |
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73 { |
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74 ostrstream output_buf; |
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75 print_code (output_buf); |
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76 output_buf << ends; |
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77 maybe_page_output (output_buf); |
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78 } |
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79 } |
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80 |
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81 void |
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581
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82 tree_statement::print_code (ostream& os) |
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83 { |
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84 if (command) |
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85 { |
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86 command->print_code (os); |
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87 |
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88 if (! print_flag) |
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89 os << ";"; |
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90 |
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91 command->print_code_new_line (os); |
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92 } |
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93 else if (expression) |
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94 { |
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95 expression->print_code (os); |
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96 |
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97 if (! print_flag) |
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98 os << ";"; |
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99 |
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100 expression->print_code_new_line (os); |
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101 } |
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102 } |
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103 |
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577
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104 tree_constant |
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105 tree_statement_list::eval (int print) |
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106 { |
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107 int pf; |
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108 tree_constant retval; |
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109 |
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110 if (error_state) |
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111 return retval; |
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112 |
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113 for (Pix p = first (); p != 0; next (p)) |
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114 { |
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115 tree_statement *elt = this->operator () (p); |
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116 |
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117 if (print == 0) |
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118 pf = 0; |
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119 else |
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120 pf = elt->print_flag; |
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121 |
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122 tree_command *cmd = elt->command; |
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123 tree_expression *expr = elt->expression; |
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124 |
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125 if (cmd || expr) |
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126 { |
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127 elt->maybe_echo_code (function_body); |
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128 |
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129 if (cmd) |
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130 cmd->eval (); |
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131 else |
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132 retval = expr->eval (pf); |
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133 |
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134 if (error_state) |
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135 return tree_constant (); |
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136 |
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137 if (breaking || continuing) |
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138 break; |
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139 |
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140 if (returning) |
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141 break; |
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142 } |
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143 else |
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144 retval = tree_constant (); |
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145 } |
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146 return retval; |
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147 } |
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148 |
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672
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149 Octave_object |
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150 tree_statement_list::eval (int print, int nargout) |
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151 { |
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152 Octave_object retval; |
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153 |
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154 if (nargout > 1) |
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155 { |
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156 int pf; |
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157 |
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158 if (error_state) |
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159 return retval; |
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160 |
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161 for (Pix p = first (); p != 0; next (p)) |
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162 { |
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163 tree_statement *elt = this->operator () (p); |
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164 |
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165 if (print == 0) |
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166 pf = 0; |
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167 else |
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168 pf = elt->print_flag; |
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169 |
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170 tree_command *cmd = elt->command; |
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171 tree_expression *expr = elt->expression; |
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172 |
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173 if (cmd || expr) |
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174 { |
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1588
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175 elt->maybe_echo_code (function_body); |
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176 |
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672
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177 if (cmd) |
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178 cmd->eval (); |
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179 else |
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180 { |
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181 if (expr->is_multi_val_ret_expression ()) |
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182 { |
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183 Octave_object args; |
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184 tree_multi_val_ret *t = (tree_multi_val_ret *) expr; |
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185 retval = t->eval (pf, nargout, args); |
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186 } |
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187 else |
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188 retval = expr->eval (pf); |
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189 } |
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190 |
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191 if (error_state) |
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192 return tree_constant (); |
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193 |
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194 if (breaking || continuing) |
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195 break; |
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196 |
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197 if (returning) |
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198 break; |
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199 } |
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200 else |
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201 retval = Octave_object (); |
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202 } |
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203 return retval; |
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204 } |
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205 else |
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206 retval = eval (print); |
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207 |
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208 return retval; |
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209 } |
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210 |
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581
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211 void |
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212 tree_statement_list::print_code (ostream& os) |
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213 { |
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214 for (Pix p = first (); p != 0; next (p)) |
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215 { |
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216 tree_statement *elt = this->operator () (p); |
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217 |
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218 if (elt) |
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219 elt->print_code (os); |
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220 } |
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221 } |
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222 |
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577
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223 Octave_object |
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224 tree_argument_list::convert_to_const_vector (void) |
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225 { |
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712
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226 int len = length (); |
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577
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227 |
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1358
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228 // XXX FIXME XXX -- would be nice to know in advance how largs args |
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229 // needs to be even when we have a list containing an all_va_args |
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230 // token. |
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922
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231 |
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577
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232 Octave_object args; |
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233 args.resize (len); |
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234 |
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235 Pix p = first (); |
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922
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236 int j = 0; |
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712
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237 for (int k = 0; k < len; k++) |
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577
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238 { |
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239 tree_expression *elt = this->operator () (p); |
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240 if (elt) |
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241 { |
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922
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242 tree_constant tmp = elt->eval (0); |
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577
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243 if (error_state) |
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244 { |
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245 ::error ("evaluating argument list element number %d", k); |
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922
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246 args = Octave_object (); |
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577
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247 break; |
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248 } |
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922
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249 else |
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250 { |
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251 if (tmp.is_all_va_args ()) |
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252 { |
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253 if (curr_function) |
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254 { |
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255 Octave_object tva; |
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256 tva = curr_function->octave_all_va_args (); |
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257 int n = tva.length (); |
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258 for (int i = 0; i < n; i++) |
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259 args(j++) = tva(i); |
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260 } |
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261 else |
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262 { |
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263 ::error ("all_va_args is only valid inside functions"); |
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264 args = Octave_object (); |
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265 break; |
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266 } |
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267 } |
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268 else |
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269 args(j++) = tmp; |
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270 } |
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577
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271 next (p); |
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272 } |
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273 else |
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274 { |
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927
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275 args(j++) = tree_constant (); |
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577
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276 break; |
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277 } |
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278 } |
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712
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279 |
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927
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280 args.resize (j); |
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281 |
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577
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282 return args; |
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283 } |
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284 |
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581
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285 void |
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286 tree_argument_list::print_code (ostream& os) |
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287 { |
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288 Pix p = first (); |
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289 |
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290 while (p) |
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291 { |
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292 tree_expression *elt = this->operator () (p); |
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293 |
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294 next (p); |
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295 |
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296 if (elt) |
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297 { |
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298 elt->print_code (os); |
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299 |
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300 if (p) |
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301 os << ", "; |
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302 } |
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303 } |
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304 } |
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305 |
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577
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306 // Parameter lists. |
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307 |
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308 void |
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309 tree_parameter_list::mark_as_formal_parameters (void) |
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310 { |
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311 for (Pix p = first (); p != 0; next (p)) |
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312 { |
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313 tree_identifier *elt = this->operator () (p); |
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314 elt->mark_as_formal_parameter (); |
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315 } |
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316 } |
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317 |
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318 void |
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1127
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319 tree_parameter_list::initialize_undefined_elements (tree_constant& val) |
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1093
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320 { |
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321 for (Pix p = first (); p != 0; next (p)) |
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322 { |
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323 tree_identifier *elt = this->operator () (p); |
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324 if (! elt->is_defined ()) |
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325 elt->assign (val); |
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326 } |
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327 } |
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328 |
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329 void |
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577
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330 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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331 { |
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712
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332 int nargin = args.length (); |
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333 |
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334 if (nargin <= 0) |
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577
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335 return; |
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336 |
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712
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337 int expected_nargin = length (); |
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577
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338 |
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339 Pix p = first (); |
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340 |
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712
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341 for (int i = 0; i < expected_nargin; i++) |
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577
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342 { |
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343 tree_identifier *elt = this->operator () (p); |
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344 |
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345 tree_constant *tmp = 0; |
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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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354 tmp = new tree_constant (args(i)); |
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355 } |
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356 |
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357 elt->define (tmp); |
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358 |
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359 next (p); |
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360 } |
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361 } |
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362 |
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363 Octave_object |
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723
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364 tree_parameter_list::convert_to_const_vector (tree_va_return_list *vr_list) |
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577
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365 { |
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366 int nout = length (); |
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367 |
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723
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368 if (vr_list) |
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369 nout += vr_list->length (); |
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370 |
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577
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371 Octave_object retval; |
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372 retval.resize (nout); |
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373 |
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374 int i = 0; |
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375 |
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376 for (Pix p = first (); p != 0; next (p)) |
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377 { |
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378 tree_identifier *elt = this->operator () (p); |
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379 |
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380 if (elt->is_defined ()) |
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381 retval(i) = elt->eval (0); |
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382 |
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383 i++; |
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384 } |
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385 |
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723
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386 if (vr_list) |
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387 { |
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1321
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388 for (Pix p = vr_list->first (); p != 0; vr_list->next (p)) |
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723
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389 { |
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390 retval(i) = vr_list->operator () (p); |
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391 i++; |
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392 } |
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393 } |
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394 |
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577
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395 return retval; |
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396 } |
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397 |
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398 int |
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399 tree_parameter_list::is_defined (void) |
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400 { |
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401 int status = 1; |
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402 |
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403 for (Pix p = first (); p != 0; next (p)) |
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404 { |
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405 tree_identifier *elt = this->operator () (p); |
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406 |
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407 if (! elt->is_defined ()) |
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408 { |
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409 status = 0; |
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410 break; |
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411 } |
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412 } |
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413 |
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414 return status; |
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415 } |
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416 |
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417 void |
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581
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418 tree_parameter_list::print_code (ostream& os) |
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419 { |
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420 Pix p = first (); |
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421 |
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422 while (p) |
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423 { |
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424 tree_identifier *elt = this->operator () (p); |
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425 |
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426 next (p); |
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427 |
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428 if (elt) |
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429 { |
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430 elt->print_code (os); |
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431 |
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432 if (p) |
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433 os << ", "; |
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434 } |
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435 } |
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436 } |
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437 |
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438 // Return lists. |
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439 |
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440 void |
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441 tree_return_list::print_code (ostream& os) |
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442 { |
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443 Pix p = first (); |
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444 |
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445 while (p) |
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446 { |
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447 tree_index_expression *elt = this->operator () (p); |
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448 |
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449 next (p); |
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450 |
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451 if (elt) |
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452 { |
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453 elt->print_code (os); |
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454 |
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455 if (p) |
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456 os << ", "; |
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457 } |
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458 } |
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459 } |
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460 |
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461 // Global. |
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462 |
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463 void |
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577
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464 tree_global::eval (void) |
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465 { |
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466 if (ident) |
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467 { |
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468 ident->link_to_global (); |
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469 } |
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470 else if (assign_expr) |
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471 { |
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745
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472 tree_identifier *id = 0; |
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473 if (assign_expr->left_hand_side_is_identifier_only () |
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474 && (id = assign_expr->left_hand_side_id ())) |
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475 { |
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476 id->link_to_global (); |
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477 assign_expr->eval (0); |
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478 } |
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479 else |
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480 error ("global: unable to make individual structure elements global"); |
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577
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481 } |
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482 } |
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483 |
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484 void |
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581
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485 tree_global::print_code (ostream& os) |
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486 { |
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487 if (ident) |
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488 ident->print_code (os); |
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489 |
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490 if (assign_expr) |
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491 assign_expr->print_code (os); |
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492 } |
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493 |
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494 // Global initializer lists. |
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495 |
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496 void |
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577
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497 tree_global_init_list::eval (void) |
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498 { |
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499 for (Pix p = first (); p != 0; next (p)) |
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500 { |
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501 tree_global *t = this->operator () (p); |
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502 t->eval (); |
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503 } |
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504 } |
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505 |
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581
|
506 void |
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507 tree_global_init_list::print_code (ostream& os) |
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508 { |
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509 Pix p = first (); |
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510 |
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511 while (p) |
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512 { |
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513 tree_global *elt = this->operator () (p); |
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514 |
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515 next (p); |
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516 |
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517 if (elt) |
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518 { |
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519 elt->print_code (os); |
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520 |
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521 if (p) |
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522 os << ", "; |
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523 } |
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524 } |
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525 } |
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526 |
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|
527 // If. |
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528 |
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577
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529 int |
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|
530 tree_if_clause::eval (void) |
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|
531 { |
|
1491
|
532 if (is_else_clause () || expr->is_logically_true ("if")) |
|
577
|
533 { |
|
|
534 if (list) |
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|
535 list->eval (1); |
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|
536 |
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|
537 return 1; |
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|
538 } |
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539 |
|
|
540 return 0; |
|
|
541 } |
|
|
542 |
|
|
543 void |
|
581
|
544 tree_if_clause::print_code (ostream& os) |
|
|
545 { |
|
|
546 if (expr) |
|
1063
|
547 expr->print_code (os); |
|
581
|
548 |
|
1063
|
549 print_code_new_line (os); |
|
1588
|
550 |
|
1063
|
551 increment_indent_level (); |
|
581
|
552 |
|
|
553 if (list) |
|
|
554 { |
|
|
555 list->print_code (os); |
|
|
556 |
|
|
557 decrement_indent_level (); |
|
|
558 } |
|
|
559 } |
|
|
560 |
|
|
561 // List of if commands. |
|
|
562 |
|
|
563 void |
|
577
|
564 tree_if_command_list::eval (void) |
|
|
565 { |
|
|
566 for (Pix p = first (); p != 0; next (p)) |
|
|
567 { |
|
|
568 tree_if_clause *t = this->operator () (p); |
|
|
569 |
|
|
570 if (t->eval () || error_state) |
|
|
571 break; |
|
|
572 } |
|
|
573 } |
|
|
574 |
|
581
|
575 void |
|
|
576 tree_if_command_list::print_code (ostream& os) |
|
|
577 { |
|
|
578 Pix p = first (); |
|
|
579 |
|
|
580 int first_elt = 1; |
|
|
581 |
|
|
582 while (p) |
|
|
583 { |
|
|
584 tree_if_clause *elt = this->operator () (p); |
|
|
585 |
|
|
586 if (elt) |
|
|
587 { |
|
1063
|
588 if (! first_elt) |
|
581
|
589 { |
|
|
590 print_code_indent (os); |
|
|
591 |
|
1063
|
592 if (elt->is_else_clause ()) |
|
|
593 os << "else"; |
|
|
594 else |
|
|
595 os << "elseif "; |
|
581
|
596 } |
|
|
597 |
|
|
598 elt->print_code (os); |
|
|
599 } |
|
|
600 |
|
|
601 first_elt = 0; |
|
1063
|
602 next (p); |
|
581
|
603 } |
|
|
604 } |
|
|
605 |
|
577
|
606 /* |
|
|
607 ;;; Local Variables: *** |
|
|
608 ;;; mode: C++ *** |
|
|
609 ;;; page-delimiter: "^/\\*" *** |
|
|
610 ;;; End: *** |
|
|
611 */ |
