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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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37 #include "error.h" |
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38 #include "tree.h" |
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39 #include "tree-misc.h" |
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40 #include "tree-expr.h" |
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41 #include "tree-const.h" |
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42 #include "user-prefs.h" |
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43 #include "oct-obj.h" |
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44 |
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45 // Nonzero means we're breaking out of a loop. |
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46 extern int breaking; |
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47 |
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48 // Nonzero means we're jumping to the end of a loop. |
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49 extern int continuing; |
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50 |
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51 // Nonzero means we're returning from a function. |
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52 extern int returning; |
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53 |
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54 // A list of commands to be executed. |
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55 |
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56 tree_statement::~tree_statement (void) |
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57 { |
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58 delete command; |
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59 delete expression; |
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60 } |
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61 |
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62 tree_constant |
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63 tree_statement_list::eval (int print) |
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64 { |
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65 int pf; |
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66 tree_constant retval; |
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67 |
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68 if (error_state) |
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69 return retval; |
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70 |
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71 for (Pix p = first (); p != 0; next (p)) |
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72 { |
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73 tree_statement *elt = this->operator () (p); |
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74 |
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75 if (print == 0) |
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76 pf = 0; |
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77 else |
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78 pf = elt->print_flag; |
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79 |
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80 tree_command *cmd = elt->command; |
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81 tree_expression *expr = elt->expression; |
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82 |
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83 if (cmd || expr) |
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84 { |
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85 if (cmd) |
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86 cmd->eval (); |
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87 else |
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88 retval = expr->eval (pf); |
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89 |
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90 if (error_state) |
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91 return tree_constant (); |
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92 |
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93 if (breaking || continuing) |
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94 break; |
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95 |
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96 if (returning) |
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97 break; |
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98 } |
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99 else |
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100 retval = tree_constant (); |
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101 } |
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102 return retval; |
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103 } |
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104 |
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105 Octave_object |
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106 tree_argument_list::convert_to_const_vector (void) |
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107 { |
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108 int len = length () + 1; |
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109 |
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110 Octave_object args; |
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111 args.resize (len); |
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112 |
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113 // args[0] may eventually hold something useful, like the function |
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114 // name. |
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115 Pix p = first (); |
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116 for (int k = 1; k < len; k++) |
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117 { |
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118 tree_expression *elt = this->operator () (p); |
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119 if (elt) |
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120 { |
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121 args(k) = elt->eval (0); |
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122 if (error_state) |
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123 { |
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124 ::error ("evaluating argument list element number %d", k); |
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125 break; |
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126 } |
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127 next (p); |
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128 } |
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129 else |
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130 { |
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131 args(k) = tree_constant (); |
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132 break; |
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133 } |
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134 } |
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135 return args; |
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136 } |
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137 |
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138 // Parameter lists. |
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139 |
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140 void |
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141 tree_parameter_list::mark_as_formal_parameters (void) |
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142 { |
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143 for (Pix p = first (); p != 0; next (p)) |
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144 { |
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145 tree_identifier *elt = this->operator () (p); |
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146 elt->mark_as_formal_parameter (); |
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147 } |
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148 } |
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149 |
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150 void |
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151 tree_parameter_list::define_from_arg_vector (const Octave_object& args) |
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152 { |
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153 if (args.length () <= 0) |
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154 return; |
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155 |
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156 int nargin = args.length (); |
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157 |
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158 int expected_nargin = length () + 1; |
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159 |
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160 Pix p = first (); |
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161 |
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162 for (int i = 1; i < expected_nargin; i++) |
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163 { |
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164 tree_identifier *elt = this->operator () (p); |
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165 |
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166 tree_constant *tmp = 0; |
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167 |
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168 if (i < nargin) |
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169 { |
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170 if (args(i).is_defined () |
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171 && (args(i).const_type () == tree_constant_rep::magic_colon)) |
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172 { |
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173 ::error ("invalid use of colon in function argument list"); |
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174 return; |
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175 } |
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176 tmp = new tree_constant (args(i)); |
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177 } |
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178 |
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179 elt->define (tmp); |
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180 |
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181 next (p); |
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182 } |
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183 } |
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184 |
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185 Octave_object |
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186 tree_parameter_list::convert_to_const_vector (void) |
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187 { |
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188 int nout = length (); |
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189 |
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190 Octave_object retval; |
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191 retval.resize (nout); |
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192 |
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193 int i = 0; |
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194 |
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195 for (Pix p = first (); p != 0; next (p)) |
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196 { |
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197 tree_identifier *elt = this->operator () (p); |
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198 |
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199 if (elt->is_defined ()) |
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200 retval(i) = elt->eval (0); |
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201 |
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202 i++; |
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203 } |
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204 |
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205 return retval; |
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206 } |
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207 |
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208 int |
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209 tree_parameter_list::is_defined (void) |
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210 { |
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211 int status = 1; |
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212 |
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213 for (Pix p = first (); p != 0; next (p)) |
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214 { |
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215 tree_identifier *elt = this->operator () (p); |
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216 |
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217 if (! elt->is_defined ()) |
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218 { |
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219 status = 0; |
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220 break; |
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221 } |
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222 } |
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223 |
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224 return status; |
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225 } |
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226 |
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227 void |
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228 tree_global::eval (void) |
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229 { |
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230 if (ident) |
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231 { |
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232 ident->link_to_global (); |
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233 } |
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234 else if (assign_expr) |
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235 { |
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236 tree_identifier *id = assign_expr->left_hand_side (); |
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237 |
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238 if (id) |
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239 id->link_to_global (); |
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240 |
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241 assign_expr->eval (0); |
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242 } |
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243 } |
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244 |
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245 void |
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246 tree_global_init_list::eval (void) |
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247 { |
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248 for (Pix p = first (); p != 0; next (p)) |
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249 { |
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250 tree_global *t = this->operator () (p); |
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251 t->eval (); |
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252 } |
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253 } |
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254 |
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255 int |
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256 tree_if_clause::eval (void) |
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257 { |
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258 if (expr) |
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259 { |
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260 tree_constant t1 = expr->eval (0); |
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261 |
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262 if (error_state || t1.is_undefined ()) |
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263 return 0; |
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264 |
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265 if (t1.rows () == 0 || t1.columns () == 0) |
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266 { |
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267 int flag = user_pref.propagate_empty_matrices; |
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268 if (flag < 0) |
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269 warning ("if: empty matrix used in conditional"); |
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270 else if (flag == 0) |
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271 { |
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272 ::error ("if: empty matrix used in conditional"); |
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273 return 0; |
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274 } |
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275 t1 = tree_constant (0.0); |
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276 } |
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277 else if (! t1.is_scalar_type ()) |
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278 { |
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279 tree_constant t2 = t1.all (); |
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280 t1 = t2.all (); |
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281 } |
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282 |
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283 int expr_value = 0; |
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284 tree_constant_rep::constant_type t = t1.const_type (); |
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285 if (t == tree_constant_rep::scalar_constant) |
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286 expr_value = (int) t1.double_value (); |
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287 else if (t == tree_constant_rep::complex_scalar_constant) |
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288 expr_value = t1.complex_value () != 0.0; |
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289 else |
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290 panic_impossible (); |
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291 |
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292 if (expr_value) |
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293 { |
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294 if (list) |
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295 list->eval (1); |
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296 |
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297 return 1; |
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298 } |
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299 } |
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300 else |
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301 { |
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302 if (list) |
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303 list->eval (1); |
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304 |
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305 return 1; |
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306 } |
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307 |
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308 return 0; |
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309 } |
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310 |
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311 void |
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312 tree_if_command_list::eval (void) |
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313 { |
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314 for (Pix p = first (); p != 0; next (p)) |
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315 { |
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316 tree_if_clause *t = this->operator () (p); |
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317 |
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318 if (t->eval () || error_state) |
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319 break; |
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320 } |
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321 } |
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322 |
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323 /* |
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324 ;;; Local Variables: *** |
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325 ;;; mode: C++ *** |
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326 ;;; page-delimiter: "^/\\*" *** |
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327 ;;; End: *** |
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328 */ |
