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1 /* |
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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_base_h) |
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24 #define octave_tree_base_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 // How to print the code that the trees represent. |
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33 |
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34 class |
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35 tree_print_code |
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36 { |
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37 public: |
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38 virtual ~tree_print_code (void) { } |
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39 |
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40 virtual void print_code (ostream& os) = 0; |
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41 |
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42 void reset_indent_level (void) |
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43 { curr_print_indent_level = 0; } |
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44 |
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45 void increment_indent_level (void) |
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46 { curr_print_indent_level += 2; } |
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47 |
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48 void decrement_indent_level (void) |
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49 { curr_print_indent_level -= 2; } |
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50 |
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51 void print_code_new_line (ostream& os); |
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52 |
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53 void print_code_indent (ostream& os); |
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54 |
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55 void print_code_reset (void); |
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56 |
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57 private: |
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58 static int curr_print_indent_level; |
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59 static bool beginning_of_line; |
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60 }; |
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61 |
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62 // Base class for the parse tree. |
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63 |
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64 class |
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65 tree : public tree_print_code |
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66 { |
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67 public: |
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68 tree (int l = -1, int c = -1) |
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69 { |
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70 line_num = l; |
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71 column_num = c; |
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72 } |
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73 |
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74 virtual int line (void) const |
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75 { return line_num; } |
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76 |
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77 virtual int column (void) const |
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78 { return column_num; } |
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79 |
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80 private: |
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81 int line_num; |
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82 int column_num; |
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83 }; |
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84 |
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85 #endif |
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86 |
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87 /* |
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88 ;;; Local Variables: *** |
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89 ;;; mode: C++ *** |
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90 ;;; End: *** |
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91 */ |
