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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-lvalue.h" |
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34 #include "pager.h" |
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35 #include "pt-const.h" |
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36 #include "pt-id.h" |
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37 #include "pt-walk.h" |
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38 #include "symtab.h" |
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39 #include "utils.h" |
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40 #include "variables.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 std::string |
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45 tree_identifier::name (void) const |
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46 { |
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47 std::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_function *f, unsigned int sym_type) |
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55 { |
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56 int status = sym->define (f, 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 void |
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61 tree_identifier::document (const std::string& s) |
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62 { |
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63 if (sym) |
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64 sym->document (s); |
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65 } |
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66 |
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67 bool |
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68 tree_identifier::is_defined (void) |
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69 { |
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70 return (sym && sym->is_defined ()); |
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71 } |
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72 |
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73 bool |
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74 tree_identifier::is_function (void) |
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75 { |
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76 return (sym && sym->is_function ()); |
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77 } |
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78 |
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79 void |
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80 tree_identifier::eval_undefined_error (void) |
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81 { |
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82 int l = line (); |
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83 int c = column (); |
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84 |
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85 if (l == -1 && c == -1) |
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86 ::error ("`%s' undefined", name ().c_str ()); |
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87 else |
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88 ::error ("`%s' undefined near line %d column %d", |
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89 name ().c_str (), l, c); |
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90 } |
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91 |
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92 // Try to find a definition for an identifier. Here's how: |
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93 // |
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94 // * If the identifier is already defined and is a function defined |
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95 // in an function file that has been modified since the last time |
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96 // we parsed it, parse it again. |
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97 // |
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98 // * If the identifier is not defined, try to find a builtin |
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99 // variable or an already compiled function with the same name. |
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100 // |
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101 // * If the identifier is still undefined, try looking for an |
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102 // function file to parse. |
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103 // |
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104 // * On systems that support dynamic linking, we prefer .oct files |
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105 // over .m files. |
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106 |
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107 octave_value |
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108 tree_identifier::do_lookup (bool& script_file_executed, bool exec_script) |
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109 { |
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110 static octave_value foo; |
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111 |
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112 script_file_executed = lookup (sym, exec_script); |
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113 |
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114 return script_file_executed ? foo : sym->def (); |
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115 } |
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116 |
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117 void |
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118 tree_identifier::link_to_global (void) |
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119 { |
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120 if (sym) |
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121 link_to_global_variable (sym); |
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122 } |
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123 |
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124 void |
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125 tree_identifier::mark_as_static (void) |
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126 { |
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127 if (sym) |
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128 sym->mark_as_static (); |
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129 } |
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130 |
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131 void |
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132 tree_identifier::mark_as_formal_parameter (void) |
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133 { |
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134 if (sym) |
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135 sym->mark_as_formal_parameter (); |
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136 } |
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137 |
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138 octave_value_list |
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139 tree_identifier::rvalue (int nargout) |
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140 { |
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141 octave_value_list retval; |
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142 |
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143 if (error_state) |
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144 return retval; |
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145 |
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146 bool script_file_executed = false; |
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147 |
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148 octave_value val = do_lookup (script_file_executed); |
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149 |
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150 if (! script_file_executed) |
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151 { |
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152 if (val.is_defined ()) |
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153 { |
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154 // XXX GAGME XXX -- this would be cleaner if we required |
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155 // parens to indicate function calls. |
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156 // |
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157 // If this identifier refers to a function, we need to know |
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158 // whether it is indexed so that we can do the same thing |
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159 // for `f' and `f()'. If the index is present, return the |
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160 // function object and let tree_index_expression::rvalue |
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161 // handle indexing. Otherwise, arrange to call the function |
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162 // here, so that we don't return the function definition as |
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163 // a value. |
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164 |
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165 if (val.is_function () && ! is_postfix_indexed ()) |
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166 { |
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167 octave_value_list tmp_args; |
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168 |
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169 retval = val.do_multi_index_op (nargout, tmp_args); |
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170 } |
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171 else |
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172 { |
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173 if (print_result () && nargout == 0) |
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174 val.print_with_name (octave_stdout, name ()); |
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175 |
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176 retval = val; |
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177 } |
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178 } |
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179 else |
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180 eval_undefined_error (); |
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181 } |
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182 |
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183 return retval; |
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184 } |
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185 |
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186 octave_value |
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187 tree_identifier::rvalue (void) |
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188 { |
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189 octave_value retval; |
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190 |
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191 octave_value_list tmp = rvalue (1); |
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192 |
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193 if (! tmp.empty ()) |
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194 retval = tmp(0); |
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195 |
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196 return retval; |
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197 } |
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198 |
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199 octave_lvalue |
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200 tree_identifier::lvalue (void) |
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201 { |
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202 return sym->variable_reference (); |
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203 } |
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204 |
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205 void |
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206 tree_identifier::accept (tree_walker& tw) |
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207 { |
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208 tw.visit_identifier (*this); |
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209 } |
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210 |
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211 /* |
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212 ;;; Local Variables: *** |
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213 ;;; mode: C++ *** |
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214 ;;; End: *** |
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215 */ |
