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2887
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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 "oct-obj.h" |
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33 #include "oct-fcn.h" |
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34 #include "oct-sym.h" |
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2900
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35 #include "pager.h" |
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2887
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36 #include "pt-const.h" |
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37 #include "pt-id.h" |
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38 #include "pt-walk.h" |
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2900
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39 #include "symtab.h" |
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2887
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40 #include "utils.h" |
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41 |
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42 // Symbols from the symbol table. |
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43 |
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44 string |
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45 tree_identifier::name (void) const |
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46 { |
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47 string retval; |
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48 if (sym) |
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49 retval = sym->name (); |
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50 return retval; |
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51 } |
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52 |
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53 tree_identifier * |
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54 tree_identifier::define (octave_symbol *s, unsigned int sym_type) |
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55 { |
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56 int status = sym->define (s, sym_type); |
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57 return status ? this : 0; |
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58 } |
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59 |
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60 tree_identifier * |
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61 tree_identifier::define (octave_function *f, unsigned int sym_type) |
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62 { |
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63 int status = sym->define (f, sym_type); |
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64 return status ? this : 0; |
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65 } |
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66 |
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67 tree_identifier * |
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68 tree_identifier::define (const octave_value& v) |
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69 { |
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70 int status = sym->define (v); |
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71 return status ? this : 0; |
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72 } |
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73 |
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74 void |
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75 tree_identifier::document (const string& s) |
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76 { |
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77 if (sym) |
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78 sym->document (s); |
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79 } |
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80 |
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81 octave_value |
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82 tree_identifier::assign (octave_value::assign_op op, const octave_value& rhs) |
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83 { |
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84 octave_value retval; |
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85 |
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86 if (rhs.is_defined ()) |
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87 { |
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88 if (! sym->is_defined ()) |
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89 { |
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90 if (! (sym->is_formal_parameter () |
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91 || sym->is_linked_to_global ())) |
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92 { |
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93 link_to_builtin_variable (sym); |
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94 } |
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95 } |
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96 else if (sym->is_function ()) |
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97 { |
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98 sym->clear (); |
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99 } |
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100 |
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101 // XXX FIXME XXX -- make this work for ops other than `='. |
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102 |
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103 if (sym->define (rhs)) |
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104 retval = rhs; |
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105 } |
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106 |
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107 return retval; |
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108 } |
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109 |
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110 octave_value |
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111 tree_identifier::assign (octave_value::assign_op op, |
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112 const octave_value_list& args, |
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113 const octave_value& rhs) |
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114 { |
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115 octave_value retval; |
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116 |
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117 if (rhs.is_defined ()) |
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118 { |
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119 if (! sym->is_defined ()) |
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120 { |
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121 if (! (sym->is_formal_parameter () |
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122 || sym->is_linked_to_global ())) |
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123 { |
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124 link_to_builtin_variable (sym); |
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125 } |
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126 } |
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127 else if (sym->is_function ()) |
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128 { |
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129 sym->clear (); |
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130 } |
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131 |
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132 if (sym->is_variable () && sym->is_defined ()) |
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133 { |
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134 sym->variable_reference () . assign (op, args, rhs); |
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135 } |
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136 else |
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137 { |
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138 assert (! sym->is_defined ()); |
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139 |
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140 if (! Vresize_on_range_error) |
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141 { |
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142 ::error ("indexed assignment to previously undefined variables"); |
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143 ::error ("is only possible when resize_on_range_error is true"); |
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144 } |
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145 else |
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146 { |
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147 retval.assign (op, args, rhs); |
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148 |
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149 if (retval.is_defined ()) |
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150 sym->define (retval); |
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151 } |
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152 } |
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153 } |
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154 |
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155 return retval; |
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156 } |
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157 |
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158 bool |
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159 tree_identifier::is_defined (void) |
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160 { |
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161 return (sym && sym->is_defined ()); |
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162 } |
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163 |
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164 void |
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165 tree_identifier::increment (void) |
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166 { |
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167 if (sym) |
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168 { |
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169 if (sym->is_read_only ()) |
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170 ::error ("can't redefined read-only variable `%s'", name ().c_str ()); |
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171 else if (sym->is_defined () && sym->is_variable ()) |
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172 reference () . increment (); |
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173 else |
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174 ::error ("can only increment variables"); |
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175 } |
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176 } |
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177 |
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178 void |
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179 tree_identifier::decrement (void) |
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180 { |
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181 if (sym) |
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182 { |
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183 if (sym->is_read_only ()) |
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184 ::error ("can't redefined read-only variable `%s'", name ().c_str ()); |
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185 else if (sym->is_defined () && sym->is_variable ()) |
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186 reference () . decrement (); |
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187 else |
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188 ::error ("can only decrement variables"); |
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189 } |
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190 } |
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191 |
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192 void |
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193 tree_identifier::eval_undefined_error (void) |
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194 { |
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195 int l = line (); |
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196 int c = column (); |
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197 |
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198 if (l == -1 && c == -1) |
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199 ::error ("`%s' undefined", name ().c_str ()); |
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200 else |
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201 ::error ("`%s' undefined near line %d column %d", |
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202 name ().c_str (), l, c); |
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203 } |
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204 |
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205 // Try to find a definition for an identifier. Here's how: |
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206 // |
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207 // * If the identifier is already defined and is a function defined |
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208 // in an function file that has been modified since the last time |
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209 // we parsed it, parse it again. |
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210 // |
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211 // * If the identifier is not defined, try to find a builtin |
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212 // variable or an already compiled function with the same name. |
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213 // |
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214 // * If the identifier is still undefined, try looking for an |
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215 // function file to parse. |
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216 // |
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217 // * On systems that support dynamic linking, we prefer .oct files |
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218 // over .m files. |
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219 |
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220 octave_symbol * |
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221 tree_identifier::do_lookup (bool& script_file_executed, bool exec_script) |
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222 { |
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223 script_file_executed = lookup (sym, exec_script); |
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224 |
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225 octave_symbol *retval = 0; |
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226 |
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227 if (! script_file_executed) |
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228 retval = sym->def (); |
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229 |
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230 return retval; |
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231 } |
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232 |
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233 void |
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234 tree_identifier::link_to_global (void) |
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235 { |
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236 if (sym) |
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237 link_to_global_variable (sym); |
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238 } |
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239 |
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240 void |
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241 tree_identifier::mark_as_static (void) |
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242 { |
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243 if (sym) |
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244 sym->mark_as_static (); |
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245 } |
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246 |
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247 void |
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248 tree_identifier::mark_as_formal_parameter (void) |
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249 { |
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250 if (sym) |
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251 sym->mark_as_formal_parameter (); |
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252 } |
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253 |
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254 octave_value |
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255 tree_identifier::eval (bool print) |
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256 { |
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257 octave_value retval; |
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258 |
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259 if (error_state) |
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260 return retval; |
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261 |
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262 bool script_file_executed = false; |
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263 |
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264 octave_symbol *object_to_eval = do_lookup (script_file_executed); |
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265 |
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266 if (! script_file_executed) |
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267 { |
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268 if (object_to_eval) |
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269 { |
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270 int nargout = maybe_do_ans_assign ? 0 : 1; |
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271 |
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272 if (nargout) |
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273 { |
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274 octave_value_list tmp_args; |
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275 octave_value_list tmp = object_to_eval->eval (nargout, tmp_args); |
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276 |
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277 if (tmp.length () > 0) |
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278 retval = tmp(0); |
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279 } |
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280 else |
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281 retval = object_to_eval->eval (); |
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282 } |
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283 else |
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284 eval_undefined_error (); |
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285 } |
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286 |
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287 if (! error_state) |
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288 { |
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289 if (retval.is_defined ()) |
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290 { |
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291 if (maybe_do_ans_assign && ! object_to_eval->is_constant ()) |
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292 bind_ans (retval, print); |
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293 else if (print) |
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294 retval.print_with_name (octave_stdout, name ()); |
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295 } |
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296 else if (object_to_eval && object_to_eval->is_constant ()) |
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297 eval_undefined_error (); |
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298 } |
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299 |
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300 return retval; |
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301 } |
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302 |
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303 octave_value_list |
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304 tree_identifier::eval (bool print, int nargout, const octave_value_list& args) |
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305 { |
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306 octave_value_list retval; |
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307 |
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308 if (error_state) |
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309 return retval; |
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310 |
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311 bool script_file_executed = false; |
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312 |
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313 octave_symbol *object_to_eval = do_lookup (script_file_executed); |
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314 |
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315 if (! script_file_executed) |
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316 { |
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317 if (object_to_eval) |
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318 { |
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319 if (maybe_do_ans_assign && nargout == 1) |
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320 { |
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321 // Don't count the output arguments that we create |
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322 // automatically. |
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323 |
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324 nargout = 0; |
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325 |
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326 retval = object_to_eval->eval (nargout, args); |
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327 |
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328 if (retval.length () > 0 && retval(0).is_defined ()) |
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329 bind_ans (retval(0), print); |
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330 } |
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331 else |
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332 retval = object_to_eval->eval (nargout, args); |
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333 } |
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334 else |
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335 eval_undefined_error (); |
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336 } |
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337 |
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338 return retval; |
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339 } |
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340 |
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341 void |
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342 tree_identifier::accept (tree_walker& tw) |
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343 { |
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344 tw.visit_identifier (*this); |
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345 } |
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346 |
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347 octave_value |
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348 tree_identifier::value (void) const |
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349 { |
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350 return sym->variable_value (); |
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351 } |
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352 |
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353 octave_value& |
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354 tree_identifier::reference (void) |
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355 { |
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356 return sym->variable_reference (); |
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357 } |
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358 |
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359 /* |
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360 ;;; Local Variables: *** |
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361 ;;; mode: C++ *** |
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362 ;;; End: *** |
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363 */ |
