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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 (octave_tree_indirect_ref_h) |
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24 #define octave_tree_indirect_ref_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 <string> |
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33 |
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34 class octave_value; |
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35 class octave_value_list; |
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36 class tree_walker; |
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37 |
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38 #include "pt-exp.h" |
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39 |
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40 // Indirect references to values (structure references). |
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41 |
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42 class |
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43 tree_indirect_ref : public tree_expression |
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44 { |
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45 public: |
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46 |
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47 tree_indirect_ref (int l = -1, int c = -1) |
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48 : tree_expression (l, c), expr (0), nm () { } |
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49 |
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50 tree_indirect_ref (tree_expression *e, const string& n, |
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51 int l = -1, int c = -1) |
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52 : tree_expression (l, c), expr (e), nm (n) { } |
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53 |
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54 ~tree_indirect_ref (void); |
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55 |
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56 bool is_indirect_ref (void) const |
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57 { return true; } |
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58 |
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59 string name (void) const; |
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60 |
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61 bool lvalue_ok (void) const |
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62 { return true; } |
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63 |
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64 octave_value rvalue (void); |
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65 |
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66 octave_value_list rvalue (int nargout); |
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67 |
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68 octave_lvalue lvalue (void); |
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69 |
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70 tree_expression *expression (void) |
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71 { return expr; } |
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72 |
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73 string elt_name (void) |
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74 { return nm; } |
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75 |
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76 void accept (tree_walker& tw); |
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77 |
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78 private: |
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79 |
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80 // The LHS of this structure reference. |
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81 tree_expression *expr; |
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82 |
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83 // The sub-element name. |
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84 string nm; |
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85 |
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86 void eval_error (void) const; |
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87 |
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88 // No copying! |
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89 |
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90 tree_indirect_ref (const tree_indirect_ref&); |
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91 |
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92 tree_indirect_ref& operator = (const tree_indirect_ref&); |
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93 }; |
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94 |
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95 #endif |
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96 |
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97 /* |
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98 ;;; Local Variables: *** |
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99 ;;; mode: C++ *** |
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100 ;;; End: *** |
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101 */ |
