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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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2955
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35 #include "oct-var-ref.h" |
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2900
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36 #include "pager.h" |
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2887
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37 #include "pt-const.h" |
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38 #include "pt-id.h" |
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39 #include "pt-walk.h" |
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2900
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40 #include "symtab.h" |
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2887
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41 #include "utils.h" |
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42 |
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43 // Symbols from the symbol table. |
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44 |
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45 string |
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46 tree_identifier::name (void) const |
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47 { |
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48 string retval; |
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49 if (sym) |
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50 retval = sym->name (); |
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51 return retval; |
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52 } |
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53 |
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54 tree_identifier * |
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55 tree_identifier::define (octave_symbol *s, unsigned int sym_type) |
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56 { |
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57 int status = sym->define (s, sym_type); |
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58 return status ? this : 0; |
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59 } |
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60 |
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61 tree_identifier * |
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62 tree_identifier::define (octave_function *f, unsigned int sym_type) |
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63 { |
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64 int status = sym->define (f, sym_type); |
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65 return status ? this : 0; |
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66 } |
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67 |
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68 tree_identifier * |
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69 tree_identifier::define (const octave_value& v) |
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70 { |
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71 int status = sym->define (v); |
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72 return status ? this : 0; |
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73 } |
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74 |
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75 void |
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76 tree_identifier::document (const string& s) |
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77 { |
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78 if (sym) |
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79 sym->document (s); |
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80 } |
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81 |
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82 bool |
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83 tree_identifier::is_defined (void) |
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84 { |
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85 return (sym && sym->is_defined ()); |
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86 } |
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87 |
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88 void |
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89 tree_identifier::increment (void) |
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90 { |
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91 if (sym) |
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92 { |
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93 if (sym->is_read_only ()) |
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94 ::error ("can't redefined read-only variable `%s'", name ().c_str ()); |
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95 else if (sym->is_defined () && sym->is_variable ()) |
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96 reference () . increment (); |
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97 else |
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98 ::error ("can only increment variables"); |
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99 } |
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100 } |
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101 |
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102 void |
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103 tree_identifier::decrement (void) |
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104 { |
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105 if (sym) |
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106 { |
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107 if (sym->is_read_only ()) |
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108 ::error ("can't redefined read-only variable `%s'", name ().c_str ()); |
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109 else if (sym->is_defined () && sym->is_variable ()) |
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110 reference () . decrement (); |
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111 else |
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112 ::error ("can only decrement variables"); |
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113 } |
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114 } |
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115 |
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116 void |
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117 tree_identifier::eval_undefined_error (void) |
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118 { |
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119 int l = line (); |
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120 int c = column (); |
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121 |
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122 if (l == -1 && c == -1) |
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123 ::error ("`%s' undefined", name ().c_str ()); |
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124 else |
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125 ::error ("`%s' undefined near line %d column %d", |
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126 name ().c_str (), l, c); |
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127 } |
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128 |
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129 // Try to find a definition for an identifier. Here's how: |
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130 // |
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131 // * If the identifier is already defined and is a function defined |
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132 // in an function file that has been modified since the last time |
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133 // we parsed it, parse it again. |
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134 // |
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135 // * If the identifier is not defined, try to find a builtin |
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136 // variable or an already compiled function with the same name. |
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137 // |
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138 // * If the identifier is still undefined, try looking for an |
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139 // function file to parse. |
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140 // |
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141 // * On systems that support dynamic linking, we prefer .oct files |
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142 // over .m files. |
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143 |
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144 octave_symbol * |
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145 tree_identifier::do_lookup (bool& script_file_executed, bool exec_script) |
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146 { |
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147 script_file_executed = lookup (sym, exec_script); |
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148 |
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149 octave_symbol *retval = 0; |
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150 |
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151 if (! script_file_executed) |
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152 retval = sym->def (); |
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153 |
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154 return retval; |
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155 } |
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156 |
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157 void |
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158 tree_identifier::link_to_global (void) |
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159 { |
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160 if (sym) |
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161 link_to_global_variable (sym); |
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162 } |
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163 |
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164 void |
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165 tree_identifier::mark_as_static (void) |
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166 { |
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167 if (sym) |
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168 sym->mark_as_static (); |
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169 } |
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170 |
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171 void |
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172 tree_identifier::mark_as_formal_parameter (void) |
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173 { |
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174 if (sym) |
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175 sym->mark_as_formal_parameter (); |
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176 } |
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177 |
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178 octave_value |
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179 tree_identifier::eval (bool print) |
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180 { |
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181 octave_value retval; |
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182 |
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183 if (error_state) |
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184 return retval; |
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185 |
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186 bool script_file_executed = false; |
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187 |
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188 octave_symbol *object_to_eval = do_lookup (script_file_executed); |
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189 |
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190 if (! script_file_executed) |
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191 { |
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192 if (object_to_eval) |
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193 { |
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194 int nargout = maybe_do_ans_assign ? 0 : 1; |
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195 |
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196 if (nargout) |
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197 { |
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198 octave_value_list tmp_args; |
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199 octave_value_list tmp = object_to_eval->eval (nargout, tmp_args); |
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200 |
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201 if (tmp.length () > 0) |
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202 retval = tmp(0); |
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203 } |
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204 else |
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205 retval = object_to_eval->eval (); |
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206 } |
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207 else |
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208 eval_undefined_error (); |
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209 } |
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210 |
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211 if (! error_state) |
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212 { |
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213 if (retval.is_defined ()) |
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214 { |
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215 if (maybe_do_ans_assign && ! object_to_eval->is_constant ()) |
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216 bind_ans (retval, print); |
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217 else if (print) |
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218 retval.print_with_name (octave_stdout, name ()); |
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219 } |
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220 else if (object_to_eval && object_to_eval->is_constant ()) |
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221 eval_undefined_error (); |
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222 } |
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223 |
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224 return retval; |
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225 } |
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226 |
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227 octave_value_list |
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228 tree_identifier::eval (bool print, int nargout, const octave_value_list& args) |
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229 { |
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230 octave_value_list retval; |
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231 |
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232 if (error_state) |
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233 return retval; |
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234 |
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235 bool script_file_executed = false; |
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236 |
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237 octave_symbol *object_to_eval = do_lookup (script_file_executed); |
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238 |
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239 if (! script_file_executed) |
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240 { |
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241 if (object_to_eval) |
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242 { |
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243 if (maybe_do_ans_assign && nargout == 1) |
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244 { |
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245 // Don't count the output arguments that we create |
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246 // automatically. |
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247 |
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248 nargout = 0; |
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249 |
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250 retval = object_to_eval->eval (nargout, args); |
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251 |
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252 if (retval.length () > 0 && retval(0).is_defined ()) |
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253 bind_ans (retval(0), print); |
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254 } |
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255 else |
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256 retval = object_to_eval->eval (nargout, args); |
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257 } |
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258 else |
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259 eval_undefined_error (); |
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260 } |
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261 |
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262 return retval; |
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263 } |
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264 |
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265 void |
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266 tree_identifier::accept (tree_walker& tw) |
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267 { |
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268 tw.visit_identifier (*this); |
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269 } |
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270 |
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271 octave_value |
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272 tree_identifier::value (void) const |
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273 { |
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274 return sym->variable_value (); |
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275 } |
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276 |
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2948
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277 octave_variable_reference |
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278 tree_identifier::reference (void) |
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279 { |
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280 return sym->variable_reference (); |
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281 } |
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282 |
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283 /* |
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284 ;;; Local Variables: *** |
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285 ;;; mode: C++ *** |
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286 ;;; End: *** |
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287 */ |
