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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_colon_h) |
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24 #define octave_tree_colon 1 |
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25 |
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26 #include <string> |
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27 |
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28 class tree_walker; |
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29 |
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30 class octave_value; |
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31 class octave_value_list; |
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32 class octave_lvalue; |
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33 |
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34 #include "pt-exp.h" |
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35 |
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36 // Colon expressions. |
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37 |
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38 class |
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39 tree_colon_expression : public tree_expression |
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40 { |
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41 public: |
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42 |
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43 tree_colon_expression (int l = -1, int c = -1) |
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44 : tree_expression (l, c), op_base (0), op_limit (0), |
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45 op_increment (0), save_base (false) { } |
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46 |
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47 tree_colon_expression (tree_expression *e, int l = -1, int c = -1) |
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48 : tree_expression (l, c), op_base (e), op_limit (0), |
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49 op_increment (0), save_base (false) { } |
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50 |
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51 ~tree_colon_expression (void) |
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52 { |
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53 if (! save_base) |
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54 delete op_base; |
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55 |
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56 delete op_limit; |
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57 delete op_increment; |
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58 } |
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59 |
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60 bool has_magic_end (void) const |
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61 { |
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62 return ((op_base && op_base->has_magic_end ()) |
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63 || (op_limit && op_limit->has_magic_end ()) |
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64 || (op_increment && op_increment->has_magic_end ())); |
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65 } |
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66 |
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67 void preserve_base (void) { save_base = true; } |
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68 |
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69 tree_colon_expression *append (tree_expression *t); |
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70 |
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71 bool rvalue_ok (void) const { return true; } |
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72 |
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73 octave_value rvalue (void); |
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74 |
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75 octave_value_list rvalue (int nargout); |
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76 |
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77 void eval_error (const std::string& s = std::string ()); |
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78 |
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79 tree_expression *base (void) { return op_base; } |
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80 |
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81 tree_expression *limit (void) { return op_limit; } |
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82 |
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83 tree_expression *increment (void) { return op_increment; } |
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84 |
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85 int line (void) const; |
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86 int column (void) const; |
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87 |
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88 void accept (tree_walker& tw); |
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89 |
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90 private: |
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91 |
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92 // The components of the expression. |
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93 tree_expression *op_base; |
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94 tree_expression *op_limit; |
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95 tree_expression *op_increment; |
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96 |
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97 bool save_base; |
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98 |
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99 // No copying! |
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100 |
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101 tree_colon_expression (const tree_colon_expression&); |
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102 |
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103 tree_colon_expression& operator = (const tree_colon_expression&); |
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104 }; |
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105 |
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106 #endif |
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107 |
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108 /* |
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109 ;;; Local Variables: *** |
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110 ;;; mode: C++ *** |
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111 ;;; End: *** |
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112 */ |
