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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "error.h" |
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32 #include "gripes.h" |
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33 #include "oct-map.h" |
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34 #include "oct-lvalue.h" |
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35 #include "ov.h" |
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36 #include "pt-arg-list.h" |
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37 #include "pt-bp.h" |
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38 #include "pt-cmd.h" |
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39 #include "pt-exp.h" |
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40 #include "pt-jump.h" |
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41 #include "pt-loop.h" |
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42 #include "pt-stmt.h" |
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43 #include "pt-walk.h" |
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44 #include "unwind-prot.h" |
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45 |
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46 // TRUE means we are evaluating some kind of looping construct. |
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47 bool evaluating_looping_command = false; |
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48 |
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49 // Decide if it's time to quit a for or while loop. |
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50 static inline bool |
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51 quit_loop_now (void) |
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52 { |
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53 // Maybe handle `continue N' someday... |
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54 |
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55 if (tree_continue_command::continuing) |
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56 tree_continue_command::continuing--; |
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57 |
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58 bool quit = (error_state |
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59 || tree_return_command::returning |
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60 || tree_break_command::breaking |
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61 || tree_continue_command::continuing); |
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62 |
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63 if (tree_break_command::breaking) |
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64 tree_break_command::breaking--; |
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65 |
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66 return quit; |
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67 } |
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68 |
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69 // While. |
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70 |
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71 tree_while_command::~tree_while_command (void) |
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72 { |
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73 delete expr; |
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74 delete list; |
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75 delete lead_comm; |
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76 delete trail_comm; |
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77 } |
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78 |
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79 void |
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80 tree_while_command::eval (void) |
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81 { |
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82 if (error_state) |
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83 return; |
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84 |
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85 unwind_protect::begin_frame ("while_command::eval"); |
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86 |
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87 unwind_protect_bool (evaluating_looping_command); |
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88 |
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89 evaluating_looping_command = true; |
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90 |
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91 if (! expr) |
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92 panic_impossible (); |
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93 |
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94 for (;;) |
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95 { |
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96 if (expr->is_logically_true ("while")) |
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97 { |
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98 if (list) |
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99 { |
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100 list->eval (); |
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101 |
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102 if (error_state) |
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103 { |
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104 eval_error (); |
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105 goto cleanup; |
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106 } |
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107 } |
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108 |
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109 if (quit_loop_now ()) |
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110 break; |
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111 } |
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112 else |
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113 break; |
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114 } |
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115 |
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116 cleanup: |
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117 unwind_protect::run_frame ("while_command::eval"); |
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118 } |
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119 |
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120 void |
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121 tree_while_command::eval_error (void) |
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122 { |
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123 if (error_state > 0) |
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124 ::error ("evaluating while command near line %d, column %d", |
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125 line (), column ()); |
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126 } |
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127 |
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128 void |
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129 tree_while_command::accept (tree_walker& tw) |
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130 { |
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131 tw.visit_while_command (*this); |
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132 } |
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133 |
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134 // Do-Until |
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135 |
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136 void |
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137 tree_do_until_command::eval (void) |
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138 { |
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139 if (error_state) |
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140 return; |
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141 |
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142 unwind_protect::begin_frame ("do_until_command::eval"); |
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143 |
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144 unwind_protect_bool (evaluating_looping_command); |
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145 |
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146 evaluating_looping_command = true; |
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147 |
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148 if (! expr) |
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149 panic_impossible (); |
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150 |
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151 for (;;) |
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152 { |
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153 MAYBE_DO_BREAKPOINT; |
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154 |
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155 if (list) |
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156 { |
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157 list->eval (); |
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158 |
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159 if (error_state) |
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160 { |
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161 eval_error (); |
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162 goto cleanup; |
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163 } |
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164 } |
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165 |
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166 if (quit_loop_now () || expr->is_logically_true ("do-until")) |
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167 break; |
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168 } |
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169 |
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170 cleanup: |
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171 unwind_protect::run_frame ("do_until_command::eval"); |
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172 } |
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173 |
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174 void |
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175 tree_do_until_command::eval_error (void) |
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176 { |
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177 if (error_state > 0) |
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178 ::error ("evaluating do-until command near line %d, column %d", |
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179 line (), column ()); |
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180 } |
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181 |
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182 void |
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183 tree_do_until_command::accept (tree_walker& tw) |
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184 { |
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185 tw.visit_do_until_command (*this); |
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186 } |
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187 |
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188 // For. |
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189 |
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190 tree_simple_for_command::~tree_simple_for_command (void) |
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191 { |
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192 delete expr; |
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193 delete list; |
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194 delete lead_comm; |
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195 delete trail_comm; |
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196 } |
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197 |
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198 inline void |
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199 tree_simple_for_command::do_for_loop_once (octave_lvalue& ult, |
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200 const octave_value& rhs, |
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201 bool& quit) |
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202 { |
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203 quit = false; |
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204 |
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205 ult.assign (octave_value::op_asn_eq, rhs); |
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206 |
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207 if (! error_state) |
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208 { |
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209 if (list) |
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210 { |
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211 list->eval (); |
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212 |
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213 if (error_state) |
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214 eval_error (); |
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215 } |
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216 } |
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217 else |
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218 eval_error (); |
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219 |
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220 quit = quit_loop_now (); |
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221 } |
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222 |
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223 #define DO_LOOP(arg) \ |
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224 do \ |
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225 { \ |
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226 for (int i = 0; i < steps; i++) \ |
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227 { \ |
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228 MAYBE_DO_BREAKPOINT; \ |
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229 \ |
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230 octave_value val (arg); \ |
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231 \ |
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232 bool quit = false; \ |
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233 \ |
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234 do_for_loop_once (ult, val, quit); \ |
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235 \ |
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236 if (quit) \ |
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237 break; \ |
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238 } \ |
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239 } \ |
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240 while (0) |
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241 |
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242 void |
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243 tree_simple_for_command::eval (void) |
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244 { |
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245 if (error_state) |
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246 return; |
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247 |
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248 unwind_protect::begin_frame ("simple_for_command::eval"); |
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249 |
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250 unwind_protect_bool (evaluating_looping_command); |
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251 |
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252 evaluating_looping_command = true; |
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253 |
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254 octave_value rhs = expr->rvalue (); |
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255 |
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256 if (error_state || rhs.is_undefined ()) |
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257 { |
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258 eval_error (); |
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259 goto cleanup; |
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260 } |
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261 |
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262 { |
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263 octave_lvalue ult = lhs->lvalue (); |
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264 |
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265 if (error_state) |
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266 { |
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267 eval_error (); |
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268 goto cleanup; |
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269 } |
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270 |
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271 if (rhs.is_range ()) |
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272 { |
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273 Range rng = rhs.range_value (); |
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274 |
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275 int steps = rng.nelem (); |
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276 double b = rng.base (); |
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277 double increment = rng.inc (); |
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278 |
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279 for (int i = 0; i < steps; i++) |
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280 { |
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281 MAYBE_DO_BREAKPOINT; |
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282 |
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283 double tmp_val = b + i * increment; |
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284 |
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285 octave_value val (tmp_val); |
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286 |
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287 bool quit = false; |
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288 |
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289 do_for_loop_once (ult, val, quit); |
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290 |
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291 if (quit) |
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292 break; |
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293 } |
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294 } |
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295 else if (rhs.is_scalar_type ()) |
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296 { |
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297 bool quit = false; |
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298 |
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299 MAYBE_DO_BREAKPOINT; |
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300 |
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301 do_for_loop_once (ult, rhs, quit); |
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302 } |
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303 else if (rhs.is_string ()) |
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304 { |
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305 charMatrix chm_tmp = rhs.char_matrix_value (); |
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306 int nr = chm_tmp.rows (); |
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307 int steps = chm_tmp.columns (); |
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308 |
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309 if (error_state) |
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310 goto cleanup; |
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311 |
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312 if (nr == 1) |
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313 DO_LOOP (chm_tmp (0, i)); |
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314 else |
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315 { |
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316 for (int i = 0; i < steps; i++) |
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317 { |
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318 MAYBE_DO_BREAKPOINT; |
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319 |
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320 octave_value val (chm_tmp.extract (0, i, nr-1, i), true); |
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321 |
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322 bool quit = false; |
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323 |
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324 do_for_loop_once (ult, val, quit); |
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325 |
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326 if (quit) |
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327 break; |
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328 } |
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329 } |
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330 } |
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331 else if (rhs.is_matrix_type ()) |
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332 { |
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333 Matrix m_tmp; |
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334 ComplexMatrix cm_tmp; |
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335 |
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336 int nr; |
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337 int steps; |
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338 |
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339 if (rhs.is_real_matrix ()) |
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340 { |
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341 m_tmp = rhs.matrix_value (); |
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342 nr = m_tmp.rows (); |
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343 steps = m_tmp.columns (); |
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344 } |
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345 else |
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346 { |
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347 cm_tmp = rhs.complex_matrix_value (); |
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348 nr = cm_tmp.rows (); |
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349 steps = cm_tmp.columns (); |
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350 } |
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351 |
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352 if (error_state) |
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353 goto cleanup; |
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354 |
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3877
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355 if (rhs.is_real_matrix ()) |
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356 { |
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357 if (nr == 1) |
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358 DO_LOOP (m_tmp (0, i)); |
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359 else |
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360 DO_LOOP (m_tmp.extract (0, i, nr-1, i)); |
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361 } |
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362 else |
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363 { |
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364 if (nr == 1) |
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365 DO_LOOP (cm_tmp (0, i)); |
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366 else |
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367 DO_LOOP (cm_tmp.extract (0, i, nr-1, i)); |
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368 } |
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369 } |
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370 else if (rhs.is_map ()) |
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371 { |
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372 Octave_map tmp_val (rhs.map_value ()); |
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373 |
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3877
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374 for (Pix p = tmp_val.first (); p != 0; tmp_val.next (p)) |
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375 { |
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376 MAYBE_DO_BREAKPOINT; |
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377 |
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378 octave_value val = tmp_val.contents (p); |
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379 |
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380 bool quit = false; |
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381 |
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382 do_for_loop_once (ult, val, quit); |
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383 |
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384 if (quit) |
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385 break; |
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386 } |
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387 } |
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388 else |
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389 { |
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390 ::error ("invalid type in for loop expression near line %d, column %d", |
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391 line (), column ()); |
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392 } |
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393 } |
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394 |
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395 cleanup: |
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396 unwind_protect::run_frame ("simple_for_command::eval"); |
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397 } |
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398 |
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399 void |
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400 tree_simple_for_command::eval_error (void) |
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401 { |
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402 if (error_state > 0) |
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403 ::error ("evaluating for command near line %d, column %d", |
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404 line (), column ()); |
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405 } |
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406 |
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407 void |
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408 tree_simple_for_command::accept (tree_walker& tw) |
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409 { |
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410 tw.visit_simple_for_command (*this); |
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411 } |
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412 |
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413 tree_complex_for_command::~tree_complex_for_command (void) |
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414 { |
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415 delete expr; |
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416 delete list; |
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417 delete lead_comm; |
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418 delete trail_comm; |
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419 } |
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420 |
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421 void |
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422 tree_complex_for_command::do_for_loop_once (octave_lvalue &val_ref, |
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423 octave_lvalue &key_ref, |
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424 const octave_value& val, |
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425 const octave_value& key, |
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426 bool& quit) |
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427 { |
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428 quit = false; |
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429 |
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430 val_ref.assign (octave_value::op_asn_eq, val); |
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431 key_ref.assign (octave_value::op_asn_eq, key); |
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432 |
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433 if (! error_state) |
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434 { |
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435 if (list) |
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436 { |
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437 list->eval (); |
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438 |
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439 if (error_state) |
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440 eval_error (); |
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441 } |
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442 } |
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443 else |
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444 eval_error (); |
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445 |
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446 quit = quit_loop_now (); |
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447 } |
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448 |
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449 void |
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450 tree_complex_for_command::eval (void) |
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451 { |
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452 if (error_state) |
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453 return; |
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454 |
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3877
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455 unwind_protect::begin_frame ("complex_for_command::eval"); |
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456 |
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457 unwind_protect_bool (evaluating_looping_command); |
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458 |
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459 evaluating_looping_command = true; |
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460 |
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461 octave_value rhs = expr->rvalue (); |
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462 |
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463 if (error_state || rhs.is_undefined ()) |
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464 { |
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465 eval_error (); |
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466 goto cleanup; |
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467 } |
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468 |
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469 if (rhs.is_map ()) |
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470 { |
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471 // Cycle through structure elements. First element of id_list |
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472 // is set to value and the second is set to the name of the |
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473 // structure element. |
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474 |
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475 Pix p = lhs->first (); |
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476 tree_expression *elt = lhs->operator () (p); |
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477 octave_lvalue val_ref = elt->lvalue (); |
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478 |
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479 lhs->next (p); |
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480 elt = lhs->operator () (p); |
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481 octave_lvalue key_ref = elt->lvalue (); |
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482 |
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483 Octave_map tmp_val (rhs.map_value ()); |
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484 |
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485 for (p = tmp_val.first (); p != 0; tmp_val.next (p)) |
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486 { |
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487 octave_value key = tmp_val.key (p); |
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488 octave_value val = tmp_val.contents (p); |
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489 |
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3770
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490 MAYBE_DO_BREAKPOINT; |
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491 |
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2982
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492 bool quit = false; |
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493 |
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494 do_for_loop_once (key_ref, val_ref, key, val, quit); |
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495 |
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496 if (quit) |
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497 break; |
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498 } |
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499 } |
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500 else |
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501 error ("in statement `for [X, Y] = VAL', VAL must be a structure"); |
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3877
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502 |
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503 cleanup: |
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504 unwind_protect::run_frame ("complex_for_command::eval"); |
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2982
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505 } |
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506 |
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507 void |
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508 tree_complex_for_command::eval_error (void) |
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509 { |
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510 if (error_state > 0) |
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511 ::error ("evaluating for command near line %d, column %d", |
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512 line (), column ()); |
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513 } |
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514 |
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515 void |
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516 tree_complex_for_command::accept (tree_walker& tw) |
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517 { |
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518 tw.visit_complex_for_command (*this); |
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519 } |
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520 |
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521 /* |
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522 ;;; Local Variables: *** |
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523 ;;; mode: C++ *** |
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524 ;;; End: *** |
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525 */ |
