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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (octave_tree_cmd_h) |
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25 #define octave_tree_cmd_h 1 |
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26 |
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27 #include <string> |
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28 |
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29 class tree_walker; |
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30 class symbol_table; |
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31 |
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32 #include "pt.h" |
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33 #include "pt-bp.h" |
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34 |
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35 // A base class for commands. |
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36 |
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37 class |
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38 tree_command : public tree |
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39 { |
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40 public: |
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41 |
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42 tree_command (int l = -1, int c = -1) |
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43 : tree (l, c) { } |
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44 |
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45 virtual ~tree_command (void) { } |
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46 |
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47 virtual void eval (void) = 0; |
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48 |
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49 virtual tree_command *dup (symbol_table *) = 0; |
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50 |
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51 private: |
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52 |
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53 // No copying! |
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54 |
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55 tree_command (const tree_command&); |
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56 |
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57 tree_command& operator = (const tree_command&); |
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58 }; |
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59 |
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60 // No-op. |
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61 |
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62 class |
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63 tree_no_op_command : public tree_command |
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64 { |
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65 public: |
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66 |
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67 tree_no_op_command (const std::string& cmd = "no_op", int l = -1, int c = -1) |
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68 : tree_command (l, c), orig_cmd (cmd) { } |
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69 |
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70 ~tree_no_op_command (void) { } |
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71 |
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72 void eval (void) { MAYBE_DO_BREAKPOINT; } |
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73 |
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74 tree_command *dup (symbol_table *sym_tab); |
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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 std::string original_command (void) { return orig_cmd; } |
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79 |
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80 private: |
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81 |
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82 std::string orig_cmd; |
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83 |
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84 // No copying! |
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85 |
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86 tree_no_op_command (const tree_no_op_command&); |
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87 |
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88 tree_no_op_command& operator = (const tree_no_op_command&); |
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89 }; |
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90 |
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91 #endif |
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92 |
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93 /* |
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94 ;;; Local Variables: *** |
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95 ;;; mode: C++ *** |
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96 ;;; End: *** |
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97 */ |
