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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_assign_h) |
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24 #define octave_tree_assign_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 ostream; |
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33 |
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34 class tree_argument_list; |
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35 class tree_walker; |
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36 |
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37 class octave_value; |
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38 class octave_value_list; |
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39 class octave_lvalue; |
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40 |
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41 #include "ov.h" |
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42 #include "pt-exp.h" |
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43 |
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44 // Simple assignment expressions. |
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45 |
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46 class |
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47 tree_simple_assignment : public tree_expression |
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48 { |
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49 public: |
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50 |
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51 tree_simple_assignment (bool plhs = false, int l = -1, int c = -1, |
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52 octave_value::assign_op t = octave_value::asn_eq) |
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53 : tree_expression (l, c), lhs (0), rhs (0), preserve (plhs), etype (t) { } |
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54 |
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55 tree_simple_assignment (tree_expression *le, tree_expression *re, |
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56 bool plhs = false, int l = -1, int c = -1, |
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57 octave_value::assign_op t = octave_value::asn_eq) |
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58 : tree_expression (l, c), lhs (le), rhs (re), preserve (plhs), |
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59 etype (t) { } |
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60 |
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61 ~tree_simple_assignment (void); |
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62 |
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63 bool rvalue_ok (void) const |
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64 { return true; } |
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65 |
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66 octave_value rvalue (void); |
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67 |
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68 octave_value_list rvalue (int nargout); |
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69 |
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70 bool is_assignment_expression (void) const |
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71 { return true; } |
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72 |
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73 void eval_error (void); |
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74 |
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75 string oper (void) const; |
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76 |
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77 tree_expression *left_hand_side (void) { return lhs; } |
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78 |
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79 tree_expression *right_hand_side (void) { return rhs; } |
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80 |
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81 void accept (tree_walker& tw); |
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82 |
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83 private: |
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84 |
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85 void do_assign (octave_lvalue& ult, const octave_value_list& args, |
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86 const octave_value& rhs_val); |
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87 |
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88 void do_assign (octave_lvalue& ult, const octave_value& rhs_val); |
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89 |
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90 // The left hand side of the assignment. |
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91 tree_expression *lhs; |
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92 |
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93 // The right hand side of the assignment. |
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94 tree_expression *rhs; |
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95 |
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96 // True if we should not delete the lhs. |
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97 bool preserve; |
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98 |
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99 // True if this is an assignment to the built-in variable ans. |
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100 bool ans_ass; |
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101 |
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102 // The type of the expression. |
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103 octave_value::assign_op etype; |
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104 }; |
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105 |
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106 // Multi-valued assignment expressions. |
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107 |
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108 class |
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109 tree_multi_assignment : public tree_expression |
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110 { |
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111 public: |
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112 |
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113 tree_multi_assignment (bool plhs = false, int l = -1, int c = -1) |
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114 : tree_expression (l, c), preserve (plhs), lhs (0), rhs (0) { } |
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115 |
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116 tree_multi_assignment (tree_argument_list *lst, tree_expression *r, |
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117 bool plhs = false, int l = -1, int c = -1) |
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118 : tree_expression (l, c), preserve (plhs), lhs (lst), rhs (r) { } |
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119 |
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120 ~tree_multi_assignment (void); |
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121 |
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122 bool is_assignment_expression (void) const |
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123 { return true; } |
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124 |
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125 bool rvalue_ok (void) const |
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126 { return true; } |
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127 |
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128 octave_value rvalue (void); |
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129 |
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130 octave_value_list rvalue (int nargout); |
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131 |
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132 void eval_error (void); |
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133 |
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134 tree_argument_list *left_hand_side (void) { return lhs; } |
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135 |
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136 tree_expression *right_hand_side (void) { return rhs; } |
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137 |
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138 void accept (tree_walker& tw); |
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139 |
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140 private: |
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141 |
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142 bool preserve; |
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143 tree_argument_list *lhs; |
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144 tree_expression *rhs; |
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145 }; |
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146 |
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147 #endif |
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148 |
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149 /* |
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150 ;;; Local Variables: *** |
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151 ;;; mode: C++ *** |
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152 ;;; End: *** |
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153 */ |
