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1 /* |
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2 |
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3 Copyright (C) 1996 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 (octave_tree_fvc2_h) |
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24 #define octave_tree_fvc2_h 1 |
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25 |
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26 #if defined (__GNUG__) |
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27 #pragma interface |
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28 #endif |
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29 |
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30 class ostream; |
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31 |
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32 #include <SLList.h> |
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33 |
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34 class symbol_record; |
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35 class tree_constant; |
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36 class tree_function; |
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37 |
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38 class tree_walker; |
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39 |
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40 #include "mappers.h" |
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41 #include "pt-fvc-base.h" |
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42 #include "variables.h" |
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43 |
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44 // Symbols from the symbol table. |
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45 |
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46 class |
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47 tree_identifier : public tree_fvc |
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48 { |
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49 friend class tree_index_expression; |
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50 |
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51 public: |
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52 |
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53 tree_identifier (int l = -1, int c = -1) |
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54 : tree_fvc (l, c), sym (0), maybe_do_ans_assign (false) { } |
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55 |
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56 tree_identifier (symbol_record *s, int l = -1, int c = -1) |
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57 : tree_fvc (l, c), sym (s), maybe_do_ans_assign (false) { } |
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58 |
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59 ~tree_identifier (void) { } |
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60 |
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61 bool is_identifier (void) const |
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62 { return true; } |
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63 |
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64 string name (void) const; |
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65 |
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66 tree_identifier *define (tree_constant *t); |
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67 tree_identifier *define (tree_function *t); |
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68 |
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69 void document (const string& s); |
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70 |
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71 octave_value assign (const octave_value& t); |
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72 octave_value assign (const octave_value_list& args, const octave_value& t); |
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73 |
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74 bool is_defined (void); |
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75 |
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76 void increment (void); |
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77 |
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78 void decrement (void); |
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79 |
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80 tree_fvc *do_lookup (bool& script_file_executed, bool exec_script = true); |
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81 |
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82 void link_to_global (void); |
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83 |
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84 void mark_as_formal_parameter (void); |
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85 |
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86 void mark_for_possible_ans_assign (void) |
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87 { maybe_do_ans_assign = true; } |
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88 |
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89 octave_value eval (bool print); |
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90 |
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91 octave_value_list eval (bool print, int nargout, |
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92 const octave_value_list& args); |
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93 |
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94 void eval_undefined_error (void); |
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95 |
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96 void accept (tree_walker& tw); |
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97 |
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98 octave_value value (void) const; |
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99 |
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100 octave_value& reference (void); |
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101 |
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102 private: |
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103 |
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104 // The symbol record that this identifier references. |
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105 symbol_record *sym; |
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106 |
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107 // True if we should consider assigning the result of evaluating |
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108 // this identifier to the built-in variable ans. |
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109 bool maybe_do_ans_assign; |
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110 }; |
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111 |
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112 // Indirect references to values (structure references). |
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113 |
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114 class |
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115 tree_indirect_ref : public tree_fvc |
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116 { |
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117 public: |
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118 |
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119 tree_indirect_ref (int l = -1, int c = -1) |
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120 : tree_fvc (l, c), id (0), indir (0), nm (), |
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121 preserve_ident (false), preserve_indir (false), |
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122 maybe_do_ans_assign (false) { } |
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123 |
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124 tree_indirect_ref (tree_identifier *i, int l = -1, int c = -1) |
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125 : tree_fvc (l, c), id (i), indir (0), nm (), |
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126 preserve_ident (false), preserve_indir (false), |
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127 maybe_do_ans_assign (false) { } |
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128 |
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129 tree_indirect_ref (tree_indirect_ref *i, const string& n, |
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130 int l = -1, int c = -1) |
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131 : tree_fvc (l, c), id (0), indir (i), nm (n), |
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132 preserve_ident (false), preserve_indir (false), |
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133 maybe_do_ans_assign (false) { } |
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134 |
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135 ~tree_indirect_ref (void); |
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136 |
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137 bool is_indirect_ref (void) const |
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138 { return true; } |
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139 |
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140 bool is_identifier_only (void) const |
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141 { return (id && nm.empty ()); } |
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142 |
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143 tree_identifier *ident (void) |
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144 { return id; } |
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145 |
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146 tree_indirect_ref *indirect (void) |
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147 { return indir; } |
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148 |
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149 void preserve_identifier (void) |
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150 { preserve_ident = true; } |
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151 |
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152 void preserve_indirect (void) |
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153 { preserve_indir = true; } |
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154 |
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155 void mark_for_possible_ans_assign (void) |
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156 { |
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157 maybe_do_ans_assign = true; |
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158 |
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159 if (is_identifier_only ()) |
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160 id->mark_for_possible_ans_assign (); |
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161 } |
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162 |
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163 string name (void) const; |
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164 |
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165 octave_value eval (bool print); |
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166 |
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167 octave_value_list eval (bool print, int nargout, |
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168 const octave_value_list& args); |
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169 |
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170 octave_value value (void) const; |
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171 octave_value& reference (void); |
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172 |
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173 string elt_name (void) |
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174 { return nm; } |
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175 |
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176 void accept (tree_walker& tw); |
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177 |
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178 private: |
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179 |
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180 // The identifier for this structure reference. For example, in |
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181 // a.b.c, a is the id. |
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182 tree_identifier *id; |
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183 |
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184 // This element just points to another indirect reference. |
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185 tree_indirect_ref *indir; |
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186 |
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187 // The sub-element name. |
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188 string nm; |
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189 |
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190 // True if we should not delete the identifier. |
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191 bool preserve_ident; |
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192 |
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193 // True if we should not delete the indirect reference. |
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194 bool preserve_indir; |
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195 |
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196 // True if we should consider assigning the result of evaluating |
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197 // this identifier to the built-in variable ans. |
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198 bool maybe_do_ans_assign; |
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199 }; |
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200 |
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201 // Builtin functions. |
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202 |
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203 class |
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204 tree_builtin : public tree_fvc |
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205 { |
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206 public: |
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207 |
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208 tree_builtin (const string& nm = string ()); |
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209 |
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210 tree_builtin (const builtin_mapper_function& m_fcn, |
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211 const string& nm = string ()); |
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212 |
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213 tree_builtin (Octave_builtin_fcn f, const string& nm = string ()); |
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214 |
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215 ~tree_builtin (void) { } // XXX ?? XXX |
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216 |
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217 // int is_builtin (void) const; |
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218 |
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219 bool is_mapper_function (void) const |
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220 { return is_mapper; } |
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221 |
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222 octave_value eval (bool print); |
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223 |
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224 octave_value_list eval (bool print, int nargout, const octave_value_list& args); |
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225 |
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226 string name (void) const |
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227 { return my_name; } |
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228 |
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229 void accept (tree_walker& tw); |
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230 |
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231 private: |
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232 |
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233 // True if this is a mapper function. |
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234 bool is_mapper; |
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235 |
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236 // A structure describing the mapper function. |
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237 builtin_mapper_function mapper_fcn; |
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238 |
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239 // The actual function, if it is not a mapper. |
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240 Octave_builtin_fcn fcn; |
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241 |
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242 // The name of this function. |
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243 string my_name; |
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244 }; |
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245 |
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246 #endif |
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247 |
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248 /* |
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249 ;;; Local Variables: *** |
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250 ;;; mode: C++ *** |
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251 ;;; End: *** |
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252 */ |
