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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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4 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #if defined (__GNUG__) |
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29 #pragma implementation |
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30 #endif |
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31 |
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32 #include <sys/types.h> |
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33 #ifdef HAVE_UNISTD_H |
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34 #include <unistd.h> |
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35 #endif |
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36 |
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581
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37 #include <iostream.h> |
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38 |
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577
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39 #include "error.h" |
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584
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40 #include "tree-base.h" |
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41 #include "tree-expr.h" |
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42 #include "tree-cmd.h" |
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577
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43 #include "tree-misc.h" |
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44 #include "tree-const.h" |
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45 #include "user-prefs.h" |
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46 #include "oct-obj.h" |
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47 |
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48 // Nonzero means we're breaking out of a loop. |
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49 extern int breaking; |
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50 |
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51 // Nonzero means we're jumping to the end of a loop. |
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52 extern int continuing; |
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53 |
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54 // Nonzero means we're returning from a function. |
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55 extern int returning; |
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56 |
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57 // A list of commands to be executed. |
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58 |
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59 tree_statement::~tree_statement (void) |
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60 { |
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61 delete command; |
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62 delete expression; |
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63 } |
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64 |
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581
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65 void |
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66 tree_statement::print_code (ostream& os) |
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67 { |
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68 if (command) |
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69 { |
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70 command->print_code (os); |
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71 |
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72 if (! print_flag) |
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73 os << ";"; |
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74 |
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75 command->print_code_new_line (os); |
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76 } |
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77 else if (expression) |
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78 { |
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79 expression->print_code (os); |
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80 |
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81 if (! print_flag) |
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82 os << ";"; |
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83 |
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84 expression->print_code_new_line (os); |
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85 } |
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86 |
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87 |
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88 } |
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89 |
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577
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90 tree_constant |
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91 tree_statement_list::eval (int print) |
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92 { |
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93 int pf; |
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94 tree_constant retval; |
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95 |
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96 if (error_state) |
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97 return retval; |
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98 |
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99 for (Pix p = first (); p != 0; next (p)) |
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100 { |
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101 tree_statement *elt = this->operator () (p); |
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102 |
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103 if (print == 0) |
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104 pf = 0; |
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105 else |
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106 pf = elt->print_flag; |
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107 |
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108 tree_command *cmd = elt->command; |
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109 tree_expression *expr = elt->expression; |
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110 |
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111 if (cmd || expr) |
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112 { |
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113 if (cmd) |
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114 cmd->eval (); |
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115 else |
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116 retval = expr->eval (pf); |
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117 |
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118 if (error_state) |
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119 return tree_constant (); |
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120 |
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121 if (breaking || continuing) |
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122 break; |
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123 |
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124 if (returning) |
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125 break; |
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126 } |
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127 else |
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128 retval = tree_constant (); |
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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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581
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133 void |
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134 tree_statement_list::print_code (ostream& os) |
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135 { |
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136 for (Pix p = first (); p != 0; next (p)) |
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137 { |
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138 tree_statement *elt = this->operator () (p); |
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139 |
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140 if (elt) |
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141 elt->print_code (os); |
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142 } |
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143 } |
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144 |
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577
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145 Octave_object |
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146 tree_argument_list::convert_to_const_vector (void) |
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147 { |
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148 int len = length () + 1; |
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149 |
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150 Octave_object args; |
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151 args.resize (len); |
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152 |
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153 // args[0] may eventually hold something useful, like the function |
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154 // name. |
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155 Pix p = first (); |
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156 for (int k = 1; k < len; k++) |
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157 { |
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158 tree_expression *elt = this->operator () (p); |
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159 if (elt) |
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160 { |
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161 args(k) = elt->eval (0); |
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162 if (error_state) |
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163 { |
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164 ::error ("evaluating argument list element number %d", k); |
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165 break; |
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166 } |
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167 next (p); |
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168 } |
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169 else |
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170 { |
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171 args(k) = tree_constant (); |
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172 break; |
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173 } |
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174 } |
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175 return args; |
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176 } |
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177 |
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178 void |
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179 tree_argument_list::print_code (ostream& os) |
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180 { |
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181 Pix p = first (); |
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182 |
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183 while (p) |
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184 { |
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185 tree_expression *elt = this->operator () (p); |
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186 |
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187 next (p); |
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188 |
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189 if (elt) |
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190 { |
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191 elt->print_code (os); |
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192 |
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193 if (p) |
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194 os << ", "; |
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195 } |
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196 } |
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197 } |
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198 |
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577
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199 // Parameter lists. |
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200 |
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201 void |
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202 tree_parameter_list::mark_as_formal_parameters (void) |
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203 { |
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204 for (Pix p = first (); p != 0; next (p)) |
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205 { |
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206 tree_identifier *elt = this->operator () (p); |
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207 elt->mark_as_formal_parameter (); |
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208 } |
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209 } |
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210 |
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211 void |
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212 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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213 { |
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214 if (args.length () <= 0) |
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215 return; |
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216 |
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217 int nargin = args.length (); |
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218 |
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219 int expected_nargin = length () + 1; |
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220 |
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221 Pix p = first (); |
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222 |
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223 for (int i = 1; i < expected_nargin; i++) |
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224 { |
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225 tree_identifier *elt = this->operator () (p); |
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226 |
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227 tree_constant *tmp = 0; |
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228 |
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229 if (i < nargin) |
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230 { |
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231 if (args(i).is_defined () |
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232 && (args(i).const_type () == tree_constant_rep::magic_colon)) |
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233 { |
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234 ::error ("invalid use of colon in function argument list"); |
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235 return; |
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236 } |
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237 tmp = new tree_constant (args(i)); |
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238 } |
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239 |
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240 elt->define (tmp); |
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241 |
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242 next (p); |
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243 } |
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244 } |
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245 |
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246 Octave_object |
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247 tree_parameter_list::convert_to_const_vector (void) |
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248 { |
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249 int nout = length (); |
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250 |
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251 Octave_object retval; |
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252 retval.resize (nout); |
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253 |
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254 int i = 0; |
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255 |
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256 for (Pix p = first (); p != 0; next (p)) |
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257 { |
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258 tree_identifier *elt = this->operator () (p); |
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259 |
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260 if (elt->is_defined ()) |
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261 retval(i) = elt->eval (0); |
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262 |
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263 i++; |
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264 } |
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265 |
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266 return retval; |
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267 } |
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268 |
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269 int |
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270 tree_parameter_list::is_defined (void) |
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271 { |
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272 int status = 1; |
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273 |
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274 for (Pix p = first (); p != 0; next (p)) |
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275 { |
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276 tree_identifier *elt = this->operator () (p); |
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277 |
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278 if (! elt->is_defined ()) |
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279 { |
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280 status = 0; |
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281 break; |
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282 } |
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283 } |
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284 |
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285 return status; |
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286 } |
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287 |
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288 void |
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581
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289 tree_parameter_list::print_code (ostream& os) |
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290 { |
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291 Pix p = first (); |
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292 |
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293 while (p) |
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294 { |
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295 tree_identifier *elt = this->operator () (p); |
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296 |
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297 next (p); |
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298 |
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299 if (elt) |
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300 { |
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301 elt->print_code (os); |
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302 |
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303 if (p) |
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304 os << ", "; |
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305 } |
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306 } |
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307 } |
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308 |
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309 // Return lists. |
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310 |
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311 void |
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312 tree_return_list::print_code (ostream& os) |
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313 { |
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314 Pix p = first (); |
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315 |
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316 while (p) |
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317 { |
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318 tree_index_expression *elt = this->operator () (p); |
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319 |
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320 next (p); |
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321 |
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322 if (elt) |
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323 { |
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324 elt->print_code (os); |
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325 |
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326 if (p) |
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327 os << ", "; |
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328 } |
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329 } |
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330 } |
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331 |
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332 // Global. |
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333 |
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334 void |
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577
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335 tree_global::eval (void) |
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336 { |
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337 if (ident) |
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338 { |
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339 ident->link_to_global (); |
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340 } |
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341 else if (assign_expr) |
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342 { |
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343 tree_identifier *id = assign_expr->left_hand_side (); |
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344 |
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345 if (id) |
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346 id->link_to_global (); |
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347 |
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348 assign_expr->eval (0); |
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349 } |
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350 } |
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351 |
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352 void |
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581
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353 tree_global::print_code (ostream& os) |
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354 { |
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355 if (ident) |
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356 ident->print_code (os); |
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357 |
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358 if (assign_expr) |
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359 assign_expr->print_code (os); |
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360 } |
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361 |
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362 // Global initializer lists. |
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363 |
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364 void |
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577
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365 tree_global_init_list::eval (void) |
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366 { |
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367 for (Pix p = first (); p != 0; next (p)) |
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368 { |
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369 tree_global *t = this->operator () (p); |
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370 t->eval (); |
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371 } |
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372 } |
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373 |
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581
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374 void |
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375 tree_global_init_list::print_code (ostream& os) |
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376 { |
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377 Pix p = first (); |
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378 |
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379 while (p) |
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380 { |
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381 tree_global *elt = this->operator () (p); |
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382 |
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383 next (p); |
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384 |
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385 if (elt) |
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386 { |
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387 elt->print_code (os); |
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388 |
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389 if (p) |
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390 os << ", "; |
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391 } |
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392 } |
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393 } |
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394 |
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395 // If. |
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396 |
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577
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397 int |
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398 tree_if_clause::eval (void) |
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399 { |
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400 if (expr) |
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401 { |
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402 tree_constant t1 = expr->eval (0); |
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403 |
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404 if (error_state || t1.is_undefined ()) |
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405 return 0; |
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406 |
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407 if (t1.rows () == 0 || t1.columns () == 0) |
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408 { |
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409 int flag = user_pref.propagate_empty_matrices; |
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410 if (flag < 0) |
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411 warning ("if: empty matrix used in conditional"); |
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412 else if (flag == 0) |
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413 { |
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414 ::error ("if: empty matrix used in conditional"); |
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415 return 0; |
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416 } |
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417 t1 = tree_constant (0.0); |
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418 } |
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419 else if (! t1.is_scalar_type ()) |
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420 { |
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421 tree_constant t2 = t1.all (); |
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422 t1 = t2.all (); |
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423 } |
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424 |
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425 int expr_value = 0; |
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426 tree_constant_rep::constant_type t = t1.const_type (); |
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427 if (t == tree_constant_rep::scalar_constant) |
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428 expr_value = (int) t1.double_value (); |
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429 else if (t == tree_constant_rep::complex_scalar_constant) |
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430 expr_value = t1.complex_value () != 0.0; |
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431 else |
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432 panic_impossible (); |
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433 |
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434 if (expr_value) |
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435 { |
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436 if (list) |
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437 list->eval (1); |
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438 |
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439 return 1; |
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440 } |
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441 } |
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442 else |
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443 { |
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444 if (list) |
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445 list->eval (1); |
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446 |
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447 return 1; |
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448 } |
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449 |
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450 return 0; |
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451 } |
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452 |
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453 void |
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581
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454 tree_if_clause::print_code (ostream& os) |
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455 { |
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456 if (expr) |
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457 { |
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458 expr->print_code (os); |
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459 |
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460 print_code_new_line (os); |
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461 |
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462 increment_indent_level (); |
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463 } |
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464 else |
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465 { |
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466 print_code_indent (os); |
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467 |
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468 os << "else"; |
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469 |
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470 print_code_new_line (os); |
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471 |
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472 increment_indent_level (); |
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473 } |
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474 |
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475 if (list) |
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476 { |
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477 list->print_code (os); |
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478 |
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479 decrement_indent_level (); |
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480 } |
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481 } |
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482 |
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483 // List of if commands. |
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484 |
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485 void |
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577
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486 tree_if_command_list::eval (void) |
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487 { |
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488 for (Pix p = first (); p != 0; next (p)) |
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489 { |
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490 tree_if_clause *t = this->operator () (p); |
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491 |
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492 if (t->eval () || error_state) |
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493 break; |
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494 } |
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495 } |
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496 |
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581
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497 void |
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498 tree_if_command_list::print_code (ostream& os) |
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499 { |
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500 Pix p = first (); |
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501 |
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502 int first_elt = 1; |
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503 |
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504 while (p) |
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505 { |
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506 tree_if_clause *elt = this->operator () (p); |
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507 |
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508 next (p); |
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509 |
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510 if (elt) |
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511 { |
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512 if (p && ! first_elt) |
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513 { |
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514 print_code_indent (os); |
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515 |
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516 os << "elseif "; |
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517 } |
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518 |
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519 elt->print_code (os); |
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520 } |
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521 |
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522 first_elt = 0; |
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523 } |
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524 } |
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525 |
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577
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526 /* |
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527 ;;; Local Variables: *** |
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528 ;;; mode: C++ *** |
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529 ;;; page-delimiter: "^/\\*" *** |
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530 ;;; End: *** |
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531 */ |
