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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_index_h) |
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24 #define octave_tree_index_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 tree_argument_list; |
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31 |
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32 class tree_walker; |
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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 octave_lvalue; |
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37 |
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38 #include "str-vec.h" |
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39 |
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40 #include "pt-exp.h" |
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41 |
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42 // Index expressions. |
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43 |
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44 class |
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45 tree_index_expression : public tree_expression |
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46 { |
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47 public: |
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48 |
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49 enum type |
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50 { |
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51 unknown, |
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52 paren, |
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53 brace, |
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54 dot |
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55 }; |
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56 |
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57 tree_index_expression (tree_expression *e = 0, tree_argument_list *lst = 0, |
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58 int l = -1, int c = -1, type t = paren); |
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59 |
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60 tree_index_expression (tree_expression *e, const std::string& n, |
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61 int l = -1, int c = -1); |
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62 |
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63 ~tree_index_expression (void); |
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64 |
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65 bool is_index_expression (void) const |
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66 { return (itype == paren || itype == brace); } |
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67 |
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68 bool is_indirect_ref (void) const |
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69 { return (itype == dot); } |
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70 |
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71 std::string name (void) const; |
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72 |
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73 std::string struct_elt_name (void) const |
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74 { return itype == dot ? arg_nm(0) : "<unknown>"; } |
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75 |
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76 type expr_type (void) { return itype; } |
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77 |
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78 tree_expression *expression (void) |
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79 { return expr; } |
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80 |
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81 tree_argument_list *arg_list (void) |
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82 { return list; } |
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83 |
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84 bool lvalue_ok (void) const |
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85 { return (itype == dot || expr->lvalue_ok ()); } |
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86 |
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87 bool rvalue_ok (void) const |
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88 { return true; } |
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89 |
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90 octave_value rvalue (void); |
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91 |
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92 octave_value_list rvalue (int nargout); |
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93 |
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94 octave_lvalue lvalue (void); |
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95 |
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96 void eval_error (void); |
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97 |
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98 void accept (tree_walker& tw); |
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99 |
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100 private: |
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101 |
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102 // The LHS of this index expression. |
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103 tree_expression *expr; |
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104 |
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105 // The indices (only valid if itype == paren || itype == brace). |
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106 tree_argument_list *list; |
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107 |
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108 // The type of this index expression. |
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109 type itype; |
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110 |
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111 // The names of the arguments. |
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112 string_vector arg_nm; |
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113 |
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114 // No copying! |
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115 |
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116 tree_index_expression (const tree_index_expression&); |
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117 |
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118 tree_index_expression& operator = (const tree_index_expression&); |
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119 }; |
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120 |
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121 #endif |
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122 |
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123 /* |
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124 ;;; Local Variables: *** |
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125 ;;; mode: C++ *** |
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126 ;;; End: *** |
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127 */ |
