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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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40 #include "tree.h" |
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41 #include "tree-misc.h" |
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42 #include "tree-expr.h" |
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43 #include "tree-const.h" |
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44 #include "user-prefs.h" |
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45 #include "oct-obj.h" |
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46 |
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47 // Nonzero means we're breaking out of a loop. |
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48 extern int breaking; |
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49 |
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50 // Nonzero means we're jumping to the end of a loop. |
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51 extern int continuing; |
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52 |
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53 // Nonzero means we're returning from a function. |
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54 extern int returning; |
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55 |
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56 // A list of commands to be executed. |
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57 |
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58 tree_statement::~tree_statement (void) |
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59 { |
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60 delete command; |
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61 delete expression; |
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62 } |
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63 |
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64 void |
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65 tree_statement::print_code (ostream& os) |
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66 { |
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67 if (command) |
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68 { |
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69 command->print_code (os); |
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70 |
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71 if (! print_flag) |
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72 os << ";"; |
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73 |
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74 command->print_code_new_line (os); |
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75 } |
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76 else if (expression) |
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77 { |
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78 expression->print_code (os); |
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79 |
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80 if (! print_flag) |
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81 os << ";"; |
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82 |
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83 expression->print_code_new_line (os); |
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84 } |
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85 |
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86 |
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87 } |
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88 |
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577
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89 tree_constant |
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90 tree_statement_list::eval (int print) |
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91 { |
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92 int pf; |
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93 tree_constant retval; |
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94 |
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95 if (error_state) |
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96 return retval; |
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97 |
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98 for (Pix p = first (); p != 0; next (p)) |
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99 { |
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100 tree_statement *elt = this->operator () (p); |
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101 |
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102 if (print == 0) |
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103 pf = 0; |
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104 else |
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105 pf = elt->print_flag; |
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106 |
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107 tree_command *cmd = elt->command; |
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108 tree_expression *expr = elt->expression; |
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109 |
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110 if (cmd || expr) |
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111 { |
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112 if (cmd) |
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113 cmd->eval (); |
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114 else |
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115 retval = expr->eval (pf); |
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116 |
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117 if (error_state) |
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118 return tree_constant (); |
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119 |
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120 if (breaking || continuing) |
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121 break; |
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122 |
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123 if (returning) |
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124 break; |
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125 } |
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126 else |
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127 retval = tree_constant (); |
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128 } |
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129 return retval; |
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130 } |
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131 |
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132 void |
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133 tree_statement_list::print_code (ostream& os) |
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134 { |
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135 for (Pix p = first (); p != 0; next (p)) |
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136 { |
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137 tree_statement *elt = this->operator () (p); |
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138 |
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139 if (elt) |
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140 elt->print_code (os); |
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141 } |
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142 } |
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143 |
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144 Octave_object |
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145 tree_argument_list::convert_to_const_vector (void) |
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146 { |
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147 int len = length () + 1; |
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148 |
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149 Octave_object args; |
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150 args.resize (len); |
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151 |
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152 // args[0] may eventually hold something useful, like the function |
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153 // name. |
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154 Pix p = first (); |
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155 for (int k = 1; k < len; k++) |
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156 { |
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157 tree_expression *elt = this->operator () (p); |
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158 if (elt) |
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159 { |
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160 args(k) = elt->eval (0); |
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161 if (error_state) |
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162 { |
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163 ::error ("evaluating argument list element number %d", k); |
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164 break; |
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165 } |
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166 next (p); |
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167 } |
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168 else |
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169 { |
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170 args(k) = tree_constant (); |
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171 break; |
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172 } |
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173 } |
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174 return args; |
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175 } |
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176 |
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177 void |
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178 tree_argument_list::print_code (ostream& os) |
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179 { |
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180 Pix p = first (); |
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181 |
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182 while (p) |
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183 { |
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184 tree_expression *elt = this->operator () (p); |
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185 |
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186 next (p); |
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187 |
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188 if (elt) |
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189 { |
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190 elt->print_code (os); |
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191 |
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192 if (p) |
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193 os << ", "; |
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194 } |
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195 } |
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196 } |
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197 |
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577
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198 // Parameter lists. |
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199 |
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200 void |
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201 tree_parameter_list::mark_as_formal_parameters (void) |
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202 { |
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203 for (Pix p = first (); p != 0; next (p)) |
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204 { |
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205 tree_identifier *elt = this->operator () (p); |
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206 elt->mark_as_formal_parameter (); |
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207 } |
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208 } |
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209 |
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210 void |
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211 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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212 { |
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213 if (args.length () <= 0) |
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214 return; |
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215 |
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216 int nargin = args.length (); |
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217 |
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218 int expected_nargin = length () + 1; |
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219 |
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220 Pix p = first (); |
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221 |
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222 for (int i = 1; i < expected_nargin; i++) |
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223 { |
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224 tree_identifier *elt = this->operator () (p); |
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225 |
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226 tree_constant *tmp = 0; |
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227 |
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228 if (i < nargin) |
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229 { |
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230 if (args(i).is_defined () |
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231 && (args(i).const_type () == tree_constant_rep::magic_colon)) |
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232 { |
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233 ::error ("invalid use of colon in function argument list"); |
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234 return; |
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235 } |
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236 tmp = new tree_constant (args(i)); |
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237 } |
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238 |
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239 elt->define (tmp); |
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240 |
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241 next (p); |
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242 } |
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243 } |
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244 |
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245 Octave_object |
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246 tree_parameter_list::convert_to_const_vector (void) |
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247 { |
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248 int nout = length (); |
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249 |
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250 Octave_object retval; |
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251 retval.resize (nout); |
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252 |
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253 int i = 0; |
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254 |
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255 for (Pix p = first (); p != 0; next (p)) |
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256 { |
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257 tree_identifier *elt = this->operator () (p); |
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258 |
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259 if (elt->is_defined ()) |
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260 retval(i) = elt->eval (0); |
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261 |
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262 i++; |
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263 } |
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264 |
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265 return retval; |
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266 } |
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267 |
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268 int |
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269 tree_parameter_list::is_defined (void) |
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270 { |
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271 int status = 1; |
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272 |
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273 for (Pix p = first (); p != 0; next (p)) |
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274 { |
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275 tree_identifier *elt = this->operator () (p); |
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276 |
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277 if (! elt->is_defined ()) |
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278 { |
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279 status = 0; |
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280 break; |
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281 } |
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282 } |
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283 |
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284 return status; |
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285 } |
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286 |
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287 void |
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288 tree_parameter_list::print_code (ostream& os) |
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289 { |
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290 Pix p = first (); |
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291 |
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292 while (p) |
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293 { |
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294 tree_identifier *elt = this->operator () (p); |
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295 |
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296 next (p); |
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297 |
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298 if (elt) |
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299 { |
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300 elt->print_code (os); |
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301 |
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302 if (p) |
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303 os << ", "; |
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304 } |
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305 } |
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306 } |
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307 |
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308 // Return lists. |
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309 |
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310 void |
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311 tree_return_list::print_code (ostream& os) |
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312 { |
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313 Pix p = first (); |
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314 |
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315 while (p) |
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316 { |
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317 tree_index_expression *elt = this->operator () (p); |
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318 |
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319 next (p); |
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320 |
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321 if (elt) |
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322 { |
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323 elt->print_code (os); |
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324 |
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325 if (p) |
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326 os << ", "; |
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327 } |
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328 } |
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329 } |
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330 |
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331 // Global. |
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332 |
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333 void |
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577
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334 tree_global::eval (void) |
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335 { |
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336 if (ident) |
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337 { |
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338 ident->link_to_global (); |
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339 } |
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340 else if (assign_expr) |
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341 { |
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342 tree_identifier *id = assign_expr->left_hand_side (); |
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343 |
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344 if (id) |
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345 id->link_to_global (); |
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346 |
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347 assign_expr->eval (0); |
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348 } |
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349 } |
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350 |
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351 void |
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581
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352 tree_global::print_code (ostream& os) |
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353 { |
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354 if (ident) |
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355 ident->print_code (os); |
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356 |
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357 if (assign_expr) |
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358 assign_expr->print_code (os); |
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359 } |
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360 |
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361 // Global initializer lists. |
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362 |
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363 void |
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577
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364 tree_global_init_list::eval (void) |
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365 { |
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366 for (Pix p = first (); p != 0; next (p)) |
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367 { |
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368 tree_global *t = this->operator () (p); |
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369 t->eval (); |
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370 } |
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371 } |
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372 |
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581
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373 void |
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374 tree_global_init_list::print_code (ostream& os) |
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375 { |
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376 Pix p = first (); |
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377 |
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378 while (p) |
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379 { |
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380 tree_global *elt = this->operator () (p); |
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381 |
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382 next (p); |
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383 |
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384 if (elt) |
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385 { |
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386 elt->print_code (os); |
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387 |
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388 if (p) |
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389 os << ", "; |
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390 } |
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391 } |
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392 } |
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393 |
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394 // If. |
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395 |
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577
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396 int |
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397 tree_if_clause::eval (void) |
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398 { |
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399 if (expr) |
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400 { |
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401 tree_constant t1 = expr->eval (0); |
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402 |
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403 if (error_state || t1.is_undefined ()) |
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404 return 0; |
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405 |
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406 if (t1.rows () == 0 || t1.columns () == 0) |
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407 { |
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408 int flag = user_pref.propagate_empty_matrices; |
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409 if (flag < 0) |
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410 warning ("if: empty matrix used in conditional"); |
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411 else if (flag == 0) |
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412 { |
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413 ::error ("if: empty matrix used in conditional"); |
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414 return 0; |
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415 } |
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416 t1 = tree_constant (0.0); |
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417 } |
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418 else if (! t1.is_scalar_type ()) |
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419 { |
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420 tree_constant t2 = t1.all (); |
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421 t1 = t2.all (); |
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422 } |
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423 |
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424 int expr_value = 0; |
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425 tree_constant_rep::constant_type t = t1.const_type (); |
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426 if (t == tree_constant_rep::scalar_constant) |
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427 expr_value = (int) t1.double_value (); |
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428 else if (t == tree_constant_rep::complex_scalar_constant) |
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429 expr_value = t1.complex_value () != 0.0; |
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430 else |
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431 panic_impossible (); |
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432 |
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433 if (expr_value) |
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434 { |
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435 if (list) |
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436 list->eval (1); |
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437 |
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438 return 1; |
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439 } |
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440 } |
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441 else |
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442 { |
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443 if (list) |
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444 list->eval (1); |
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445 |
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446 return 1; |
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447 } |
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448 |
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449 return 0; |
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450 } |
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451 |
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452 void |
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581
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453 tree_if_clause::print_code (ostream& os) |
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454 { |
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455 if (expr) |
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456 { |
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457 expr->print_code (os); |
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458 |
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459 print_code_new_line (os); |
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460 |
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461 increment_indent_level (); |
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462 } |
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463 else |
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464 { |
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465 print_code_indent (os); |
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466 |
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467 os << "else"; |
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468 |
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469 print_code_new_line (os); |
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470 |
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471 increment_indent_level (); |
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472 } |
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473 |
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474 if (list) |
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475 { |
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476 list->print_code (os); |
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477 |
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478 decrement_indent_level (); |
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479 } |
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480 } |
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481 |
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482 // List of if commands. |
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483 |
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484 void |
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577
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485 tree_if_command_list::eval (void) |
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486 { |
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487 for (Pix p = first (); p != 0; next (p)) |
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488 { |
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489 tree_if_clause *t = this->operator () (p); |
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490 |
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491 if (t->eval () || error_state) |
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492 break; |
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493 } |
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494 } |
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495 |
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581
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496 void |
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497 tree_if_command_list::print_code (ostream& os) |
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498 { |
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499 Pix p = first (); |
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500 |
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501 int first_elt = 1; |
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502 |
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503 while (p) |
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504 { |
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505 tree_if_clause *elt = this->operator () (p); |
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506 |
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507 next (p); |
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508 |
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509 if (elt) |
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510 { |
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511 if (p && ! first_elt) |
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512 { |
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513 print_code_indent (os); |
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514 |
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515 os << "elseif "; |
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516 } |
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517 |
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518 elt->print_code (os); |
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519 } |
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520 |
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521 first_elt = 0; |
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522 } |
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523 } |
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524 |
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577
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525 /* |
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526 ;;; Local Variables: *** |
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527 ;;; mode: C++ *** |
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528 ;;; page-delimiter: "^/\\*" *** |
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529 ;;; End: *** |
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530 */ |
