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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_binop_h) |
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24 #define octave_tree_binop_h 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 "ov.h" |
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35 #include "pt-exp.h" |
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36 |
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37 // Binary expressions. |
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38 |
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39 class |
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40 tree_binary_expression : public tree_expression |
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41 { |
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42 public: |
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43 |
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44 tree_binary_expression (int l = -1, int c = -1, |
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45 octave_value::binary_op t |
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46 = octave_value::unknown_binary_op) |
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47 : tree_expression (l, c), op_lhs (0), op_rhs (0), etype (t) { } |
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48 |
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49 tree_binary_expression (tree_expression *a, tree_expression *b, |
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50 int l = -1, int c = -1, |
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51 octave_value::binary_op t |
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52 = octave_value::unknown_binary_op) |
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53 : tree_expression (l, c), op_lhs (a), op_rhs (b), etype (t) { } |
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54 |
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55 ~tree_binary_expression (void) |
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56 { |
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57 delete op_lhs; |
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58 delete op_rhs; |
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59 } |
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60 |
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61 bool has_magic_end (void) const |
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62 { |
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63 return ((op_lhs && op_lhs->has_magic_end ()) |
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64 || (op_rhs && op_rhs->has_magic_end ())); |
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65 } |
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66 |
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67 bool is_binary_expression (void) const { return true; } |
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68 |
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69 bool rvalue_ok (void) const { return true; } |
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70 |
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71 octave_value rvalue (void); |
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72 |
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73 octave_value_list rvalue (int nargout); |
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74 |
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75 void eval_error (void); |
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76 |
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77 std::string oper (void) const; |
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78 |
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79 octave_value::binary_op op_type (void) const { return etype; } |
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80 |
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81 tree_expression *lhs (void) { return op_lhs; } |
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82 tree_expression *rhs (void) { return op_rhs; } |
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83 |
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84 void accept (tree_walker& tw); |
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85 |
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86 protected: |
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87 |
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88 // The operands for the expression. |
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89 tree_expression *op_lhs; |
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90 tree_expression *op_rhs; |
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91 |
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92 private: |
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93 |
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94 // The type of the expression. |
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95 octave_value::binary_op etype; |
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96 |
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97 // No copying! |
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98 |
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99 tree_binary_expression (const tree_binary_expression&); |
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100 |
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101 tree_binary_expression& operator = (const tree_binary_expression&); |
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102 }; |
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103 |
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104 // Boolean expressions. |
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105 |
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106 class |
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107 tree_boolean_expression : public tree_binary_expression |
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108 { |
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109 public: |
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110 |
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111 enum type |
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112 { |
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113 unknown, |
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114 bool_and, |
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115 bool_or |
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116 }; |
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117 |
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118 tree_boolean_expression (int l = -1, int c = -1, type t = unknown) |
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119 : tree_binary_expression (l, c), etype (t) { } |
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120 |
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121 tree_boolean_expression (tree_expression *a, tree_expression *b, |
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122 int l = -1, int c = -1, type t = unknown) |
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123 : tree_binary_expression (a, b, l, c), etype (t) { } |
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124 |
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125 ~tree_boolean_expression (void) { } |
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126 |
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127 bool is_boolean_expression (void) const { return true; } |
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128 |
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129 bool rvalue_ok (void) const { return true; } |
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130 |
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131 octave_value rvalue (void); |
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132 |
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133 octave_value_list rvalue (int nargout); |
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134 |
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135 std::string oper (void) const; |
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136 |
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137 type op_type (void) const { return etype; } |
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138 |
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139 private: |
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140 |
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141 // The type of the expression. |
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142 type etype; |
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143 |
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144 // No copying! |
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145 |
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146 tree_boolean_expression (const tree_boolean_expression&); |
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147 |
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148 tree_boolean_expression& operator = (const tree_boolean_expression&); |
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149 }; |
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150 |
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151 #endif |
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152 |
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153 /* |
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154 ;;; Local Variables: *** |
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155 ;;; mode: C++ *** |
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156 ;;; End: *** |
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157 */ |
