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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_cmd_h) |
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24 #define octave_tree_cmd_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 #include <string> |
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31 |
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32 class tree_walker; |
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33 |
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34 #include "pt.h" |
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35 |
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36 // A base class for commands. |
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37 |
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38 class |
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39 tree_command : public tree |
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40 { |
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41 public: |
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42 |
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43 tree_command (int l = -1, int c = -1) |
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44 : tree (l, c) { } |
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45 |
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46 virtual ~tree_command (void) { } |
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47 |
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48 virtual void eval (void) = 0; |
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49 |
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50 private: |
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51 |
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52 // No copying! |
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53 |
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54 tree_command (const tree_command&); |
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55 |
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56 tree_command& operator = (const tree_command&); |
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57 }; |
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58 |
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59 // No-op. |
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60 |
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61 class |
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62 tree_no_op_command : public tree_command |
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63 { |
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64 public: |
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65 |
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66 tree_no_op_command (const std::string& cmd = "no_op", int l = -1, int c = -1) |
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67 : tree_command (l, c), orig_cmd (cmd) { } |
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68 |
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69 ~tree_no_op_command (void) { } |
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70 |
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71 void eval (void) { } |
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72 |
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73 void accept (tree_walker& tw); |
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74 |
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75 std::string original_command (void) { return orig_cmd; } |
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76 |
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77 private: |
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78 |
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79 std::string orig_cmd; |
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80 |
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81 // No copying! |
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82 |
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83 tree_no_op_command (const tree_no_op_command&); |
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84 |
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85 tree_no_op_command& operator = (const tree_no_op_command&); |
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86 }; |
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87 |
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88 #endif |
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89 |
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90 /* |
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91 ;;; Local Variables: *** |
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92 ;;; mode: C++ *** |
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93 ;;; End: *** |
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94 */ |
