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1
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1 // variables.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 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 __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include <sys/types.h> |
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29 #ifdef HAVE_UNISTD_H |
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30 #include <unistd.h> |
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31 #endif |
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32 #include <ctype.h> |
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33 #include <iostream.h> |
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34 |
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35 #include "statdefs.h" |
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36 #include "tree-const.h" |
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37 #include "variables.h" |
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38 #include "symtab.h" |
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39 #include "error.h" |
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40 #include "utils.h" |
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41 #include "tree.h" |
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42 |
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43 // Symbol table for symbols at the top level. |
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44 symbol_table *top_level_sym_tab; |
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45 |
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46 // Symbol table for the current scope. |
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47 symbol_table *curr_sym_tab; |
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48 |
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49 // Symbol table for global symbols. |
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50 symbol_table *global_sym_tab; |
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51 |
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52 /* |
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53 * Is there a corresponding M-file that is newer than the symbol |
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54 * definition? |
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55 */ |
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56 int |
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57 symbol_out_of_date (symbol_record *sr) |
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58 { |
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59 int status = 0; |
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60 if (sr != (symbol_record *) NULL) |
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61 { |
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62 tree *ans = sr->def (); |
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63 if (ans != NULL_TREE) |
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64 { |
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65 char *mf = ans->m_file_name (); |
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66 if (mf != (char *) NULL) |
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67 { |
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68 time_t tp = ans->time_parsed (); |
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69 status = is_newer (mf, tp); |
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70 } |
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71 } |
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72 } |
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73 return status; |
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74 } |
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75 |
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76 /* |
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77 * Force a symbol into the global symbol table. |
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78 */ |
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79 symbol_record * |
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80 force_global (char *name) |
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81 { |
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82 symbol_record *retval = (symbol_record *) NULL; |
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83 |
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84 if (valid_identifier (name)) |
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85 { |
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86 symbol_record *sr; |
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87 sr = curr_sym_tab->lookup (name, 0, 0); |
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88 if (sr == (symbol_record *) NULL) |
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89 { |
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90 retval = global_sym_tab->lookup (name, 1, 0); |
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91 retval->mark_as_forced_global (); |
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92 } |
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93 else if (sr->is_formal_parameter ()) |
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94 { |
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95 error ("formal parameter `%s' can't be made global", name); |
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96 } |
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97 else |
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98 { |
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99 retval = global_sym_tab->lookup (name, 1, 0); |
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123
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100 retval->mark_as_forced_global (); |
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101 retval->alias (sr); |
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102 curr_sym_tab->clear (name); |
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103 } |
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104 } |
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105 else |
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106 warning ("`%s' is invalid as an identifier", name); |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 int |
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112 bind_variable (char *varname, tree_constant *val) |
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113 { |
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114 // Look for the symbol in the current symbol table. If it's there, |
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115 // great. If not, don't insert it, but look for it in the global |
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116 // symbol table. If it's there, great. If not, insert it in the |
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117 // original current symbol table. |
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118 |
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119 symbol_record *sr; |
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120 sr = curr_sym_tab->lookup (varname, 0, 0); |
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121 if (sr == (symbol_record *) NULL) |
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122 { |
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123 sr = global_sym_tab->lookup (varname, 0, 0); |
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124 if (sr == (symbol_record *) NULL) |
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125 { |
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126 sr = curr_sym_tab->lookup (varname, 1); |
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127 } |
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128 } |
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129 |
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130 if (sr != (symbol_record *) NULL) |
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131 { |
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132 sr->define (val); |
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133 return 0; |
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134 } |
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135 else |
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136 return 1; |
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137 } |
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138 |
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139 int |
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140 bind_protected_variable (char *varname, tree_constant *val) |
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141 { |
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142 // Look for the symbol in the current symbol table. If it's there, |
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143 // great. If not, don't insert it, but look for it in the global |
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144 // symbol table. If it's there, great. If not, insert it in the |
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145 // original current symbol table. |
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146 |
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147 symbol_record *sr; |
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148 sr = curr_sym_tab->lookup (varname, 0, 0); |
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149 if (sr == (symbol_record *) NULL) |
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150 { |
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151 sr = global_sym_tab->lookup (varname, 0, 0); |
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152 if (sr == (symbol_record *) NULL) |
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153 { |
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154 sr = curr_sym_tab->lookup (varname, 1); |
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155 } |
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156 } |
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157 |
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158 if (sr != (symbol_record *) NULL) |
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159 { |
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160 sr->unprotect (); |
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161 sr->define (val); |
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162 sr->protect (); |
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163 return 0; |
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164 } |
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165 else |
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166 return 1; |
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167 } |
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168 |
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169 /* |
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170 * Look for name first in current then in global symbol tables. If |
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171 * name is found and it refers to a string, return a new string |
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172 * containing its value. Otherwise, return NULL. |
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173 */ |
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174 char * |
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175 octave_string_variable (char *name) |
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176 { |
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177 char *retval = (char *) NULL; |
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178 symbol_record *sr; |
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179 sr = curr_sym_tab->lookup (name, 0, 0); |
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180 if (sr == (symbol_record *) NULL) |
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181 { |
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182 sr = global_sym_tab->lookup (name, 0, 0); |
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183 if (sr == (symbol_record *) NULL) |
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184 return retval; |
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185 } |
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186 |
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187 tree *defn = sr->def (); |
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188 if (defn != NULL_TREE) |
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189 { |
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190 tree_constant val = defn->eval (0); |
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191 if (val.is_string_type ()) |
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192 { |
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193 char *s = val.string_value (); |
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194 if (s != (char *) NULL) |
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195 retval = strsave (s); |
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196 } |
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197 } |
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198 |
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199 return retval; |
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200 } |
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201 |
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202 /* |
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203 * Look for name first in current then in global symbol tables. If |
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204 * name is found and it refers to a real scalar, place the value in d |
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205 * and return 0. Otherwise, return -1. |
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206 */ |
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207 int |
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208 octave_real_scalar_variable (char *name, double& d) |
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209 { |
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210 int status = -1; |
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211 symbol_record *sr; |
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212 sr = curr_sym_tab->lookup (name, 0, 0); |
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213 if (sr == (symbol_record *) NULL) |
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214 { |
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215 sr = global_sym_tab->lookup (name, 0, 0); |
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216 if (sr == (symbol_record *) NULL) |
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217 return status; |
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218 } |
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219 |
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220 tree *defn = sr->def (); |
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221 if (defn != NULL_TREE) |
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222 { |
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223 tree_constant val = defn->eval (0); |
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224 if (val.const_type () == tree_constant_rep::scalar_constant) |
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225 { |
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226 d = val.double_value (); |
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227 status = 0; |
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228 } |
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229 } |
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230 |
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231 return status; |
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232 } |
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233 |
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234 /* |
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235 * Extract a keyword and its value from a file. Input should look |
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236 * something like: |
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237 * |
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238 * #[ \t]*keyword[ \t]*:[ \t]*string-value\n |
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239 */ |
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240 int |
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241 extract_keyword (istream& is, char *keyword, char *value) |
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242 { |
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243 char *ptr = value; |
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244 |
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245 int status = 0; |
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246 |
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247 char c; |
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248 while (is.get (c)) |
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249 { |
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250 if (c == '#') |
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251 { |
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252 while (is.get (c) && (c == ' ' || c == '\t' || c == '#')) |
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253 ; // Skip whitespace and comment characters. |
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254 |
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255 if (isalpha (c)) |
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256 *ptr++ = c; |
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257 |
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258 while (is.get (c) && isalpha (c)) |
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259 *ptr++ = c; |
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260 |
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261 if (strncmp (value, keyword, strlen (keyword)) == 0) |
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262 { |
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263 ptr = value; |
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264 while (is.get (c) && (c == ' ' || c == '\t' || c == ':')) |
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265 ; // Skip whitespace and the colon. |
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266 |
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267 if (c != '\n') |
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268 { |
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269 *ptr++ = c; |
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270 while (is.get (c) && c != '\n') |
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271 *ptr++ = c; |
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272 } |
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273 *ptr = '\0'; |
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274 status = 1; |
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275 break; |
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276 } |
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277 } |
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278 } |
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279 return status; |
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280 } |
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281 |
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282 int |
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283 extract_keyword (istream& is, char *keyword, int& value) |
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284 { |
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285 char buf [128]; |
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286 char *ptr = buf; |
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287 |
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288 int status = 0; |
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289 value = 0; |
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290 |
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291 char c; |
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292 while (is.get (c)) |
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293 { |
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294 if (c == '#') |
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295 { |
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296 while (is.get (c) && (c == ' ' || c == '\t' || c == '#')) |
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297 ; // Skip whitespace and comment characters. |
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298 |
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299 if (isalpha (c)) |
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300 *ptr++ = c; |
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301 |
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302 while (is.get (c) && isalpha (c)) |
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303 *ptr++ = c; |
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304 |
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305 if (strncmp (buf, keyword, strlen (keyword)) == 0) |
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306 { |
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307 ptr = buf; |
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308 while (is.get (c) && (c == ' ' || c == '\t' || c == ':')) |
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309 ; // Skip whitespace and the colon. |
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310 |
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311 is.putback (c); |
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312 if (c != '\n') |
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313 is >> value; |
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314 if (is) |
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315 status = 1; |
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316 while (is.get (c) && c != '\n') |
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317 ; // Skip to beginning of next line; |
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318 break; |
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319 } |
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320 } |
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321 } |
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322 return status; |
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323 } |
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324 |
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325 /* |
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326 * Skip trailing white space and |
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327 */ |
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328 void |
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329 skip_comments (istream& is) |
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330 { |
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331 char c = '\0'; |
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332 while (is.get (c)) |
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333 { |
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334 if (c == ' ' || c == '\t' || c == '\n') |
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335 ; // Skip whitespace on way to beginning of next line. |
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336 else |
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337 break; |
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338 } |
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339 |
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340 for (;;) |
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341 { |
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342 if (is && c == '#') |
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343 while (is.get (c) && c != '\n') |
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344 ; // Skip to beginning of next line, ignoring everything. |
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345 else |
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346 break; |
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347 } |
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348 } |
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349 |
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350 /* |
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351 * Is `s' a valid identifier? |
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352 */ |
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353 int |
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354 valid_identifier (char *s) |
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355 { |
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356 if (s == (char *) NULL || ! (isalnum (*s) || *s == '_')) |
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357 return 0; |
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358 |
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359 while (*++s != '\0') |
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360 if (! (isalnum (*s) || *s == '_')) |
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361 return 0; |
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362 |
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363 return 1; |
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364 } |
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365 |
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366 /* |
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367 * See if the identifier is in scope. |
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368 */ |
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369 int |
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370 identifier_exists (char *name) |
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371 { |
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159
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372 symbol_record *sr = curr_sym_tab->lookup (name, 0, 0); |
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373 if (sr == (symbol_record *) NULL) |
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374 sr = global_sym_tab->lookup (name, 0, 0); |
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1
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375 |
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159
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376 if (sr != (symbol_record *) NULL && sr->is_variable ()) |
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377 return 1; |
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378 else if (sr != (symbol_record *) NULL && sr->is_function ()) |
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379 return 2; |
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1
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380 else |
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381 { |
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382 char *path = m_file_in_path (name); |
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383 if (path != (char *) NULL) |
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384 { |
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385 delete [] path; |
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159
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386 return 2; |
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1
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387 } |
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388 else |
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389 { |
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390 struct stat buf; |
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391 if (stat (name, &buf) == 0 && S_ISREG (buf.st_mode)) |
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159
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392 return 2; |
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1
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393 } |
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394 |
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395 } |
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159
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396 return 0; |
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1
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397 } |
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398 |
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399 /* |
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400 * Is this tree_constant a valid function? |
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401 */ |
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402 tree * |
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403 is_valid_function (tree_constant& arg, char *warn_for, int warn = 0) |
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404 { |
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405 tree *ans = NULL_TREE; |
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406 |
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407 if (! arg.is_string_type ()) |
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408 { |
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409 if (warn) |
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410 message (warn_for, "expecting function name as argument"); |
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411 return ans; |
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412 } |
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413 |
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414 char *fcn_name = arg.string_value (); |
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415 symbol_record *sr = global_sym_tab->lookup (fcn_name, 0, 0); |
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416 |
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417 if (sr == (symbol_record *) NULL) |
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418 { |
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419 sr = global_sym_tab->lookup (fcn_name, 1, 0); |
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420 tree_identifier tmp (sr); |
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421 tmp.parse_m_file (0); |
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422 } |
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423 else if (symbol_out_of_date (sr)) |
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424 { |
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425 tree_identifier tmp (sr); |
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426 tmp.parse_m_file (0); |
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427 } |
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428 |
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429 ans = sr->def (); |
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430 if (ans == NULL_TREE || ! sr->is_function ()) |
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431 { |
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432 if (warn) |
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433 message (warn_for, "the symbol `%s' is not valid as a function", |
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434 fcn_name); |
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435 ans = NULL_TREE; |
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436 } |
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437 |
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438 return ans; |
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439 } |
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440 |
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441 /* |
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442 * Does this function take the right number of arguments? |
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443 */ |
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444 int |
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445 takes_correct_nargs (tree *fcn, int expected_nargin, char *warn_for, |
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446 int warn = 0) |
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447 { |
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448 int nargs = fcn->max_expected_args () - 1; |
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449 int e_nargs = expected_nargin - 1; |
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450 if (nargs != e_nargs) |
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451 { |
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452 if (warn) |
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453 message (warn_for, "expecting function to take %d argument%c", |
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454 e_nargs, s_plural (e_nargs)); |
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455 return 0; |
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456 } |
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457 return 1; |
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458 } |
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459 |
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460 char ** |
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461 make_name_list (void) |
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462 { |
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463 int key_len = 0; |
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464 int glb_len = 0; |
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465 int top_len = 0; |
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466 int lcl_len = 0; |
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467 int mfl_len = 0; |
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468 |
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469 char **key = (char **) NULL; |
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470 char **glb = (char **) NULL; |
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471 char **top = (char **) NULL; |
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472 char **lcl = (char **) NULL; |
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473 char **mfl = (char **) NULL; |
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474 |
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475 key = names (keyword_help (), key_len); |
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476 glb = global_sym_tab->list (glb_len); |
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477 top = top_level_sym_tab->list (top_len); |
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478 if (top_level_sym_tab != curr_sym_tab) |
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479 lcl = curr_sym_tab->list (lcl_len); |
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480 mfl = get_m_file_names (mfl_len, 1); |
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481 |
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482 int total_len = key_len + glb_len + top_len + lcl_len + mfl_len; |
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483 |
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484 char **list = new char * [total_len+1]; |
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485 |
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486 int j = 0; |
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487 int i = 0; |
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488 for (i = 0; i < key_len; i++) |
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489 list[j++] = key[i]; |
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490 |
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491 for (i = 0; i < glb_len; i++) |
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492 list[j++] = glb[i]; |
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493 |
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494 for (i = 0; i < top_len; i++) |
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495 list[j++] = top[i]; |
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496 |
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497 for (i = 0; i < lcl_len; i++) |
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498 list[j++] = lcl[i]; |
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499 |
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500 for (i = 0; i < mfl_len; i++) |
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501 list[j++] = mfl[i]; |
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502 |
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503 list[j] = (char *) NULL; |
|
|
504 |
|
|
505 delete [] key; |
|
|
506 delete [] glb; |
|
|
507 delete [] top; |
|
|
508 delete [] lcl; |
|
|
509 delete [] mfl; |
|
|
510 |
|
|
511 return list; |
|
|
512 } |
|
|
513 |
|
|
514 /* |
|
|
515 ;;; Local Variables: *** |
|
|
516 ;;; mode: C++ *** |
|
|
517 ;;; page-delimiter: "^/\\*" *** |
|
|
518 ;;; End: *** |
|
|
519 */ |
