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1 // tree-base.h -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (_tree_base_h) |
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25 #define _tree_base_h 1 |
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26 |
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27 // NOTE: don\'t put #pragma interface here because there is no |
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28 // corresponding tree-base.cc file that implements this class! |
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29 |
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30 #ifndef NULL_TREE |
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31 #define NULL_TREE (tree *)NULL |
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32 #endif |
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33 |
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34 #ifndef NULL_TREE_CONST |
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35 #define NULL_TREE_CONST (tree_constant *)NULL |
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36 #endif |
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37 |
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38 #include <time.h> |
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39 #include <assert.h> |
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40 |
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41 class tree_constant; |
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42 class tree_identifier; |
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43 class tree_argument_list; |
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44 |
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45 /* |
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46 * Base class for the parse tree. |
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47 */ |
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48 class |
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49 tree |
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50 { |
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51 public: |
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52 enum matrix_dir |
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53 { |
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54 md_none, |
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55 md_right, |
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56 md_down, |
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57 }; |
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58 |
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59 enum expression_type |
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60 { |
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61 unknown, |
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62 assignment, |
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63 simple_assignment, |
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64 multi_assignment, |
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65 add, |
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66 subtract, |
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67 multiply, |
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68 el_mul, |
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69 divide, |
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70 el_div, |
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71 leftdiv, |
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72 el_leftdiv, |
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73 power, |
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74 elem_pow, |
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75 cmp_lt, |
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76 cmp_le, |
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77 cmp_eq, |
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78 cmp_ge, |
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79 cmp_gt, |
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80 cmp_ne, |
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81 and, |
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82 or, |
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83 not, |
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84 unot, |
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85 uminus, |
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86 hermitian, |
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87 transpose, |
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88 colon, |
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89 index, |
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90 increment, |
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91 decrement, |
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92 }; |
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93 |
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94 virtual ~tree (void) { } |
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95 |
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96 // Only the finest cheese... |
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97 virtual int is_identifier (void) |
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98 { return 0; } |
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99 |
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100 virtual int is_constant (void) |
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101 { return 0; } |
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102 |
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103 virtual int is_builtin (void) |
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104 { return 0; } |
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105 |
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106 virtual int is_index_expression (void) |
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107 { return 0; } |
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108 |
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109 virtual int is_assignment_expression (void) |
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110 { return 0; } |
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111 |
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112 virtual tree *def (void) |
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113 { assert (0); return (tree *) NULL; } |
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114 |
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115 virtual char *name (void) |
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116 { assert (0); return (char *) NULL; } |
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117 |
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118 virtual int max_expected_args (void) |
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119 { assert (0); return 0; } |
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120 |
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121 virtual void set_print_flag (int print) |
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122 { assert (0); } |
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123 |
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124 virtual tree_constant assign (tree_constant& t, tree_constant *args, |
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125 int nargs); |
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126 |
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127 virtual void bump_value (tree::expression_type) |
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128 { assert (0); } |
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129 |
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130 virtual void stash_m_file_name (char *s) |
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131 { assert (0); } |
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132 |
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133 virtual void stash_m_file_time (time_t t) |
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134 { assert (0); } |
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135 |
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136 virtual char *m_file_name (void) |
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137 { return (char *) NULL; } |
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138 |
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139 virtual time_t time_parsed (void) |
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140 { assert (0); return 0; } |
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141 |
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142 virtual tree_constant eval (int print) = 0; |
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143 |
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144 virtual tree_constant *eval (int print, int nargout); |
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145 |
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146 virtual tree_constant eval (int argc, char **argv, int print); |
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147 |
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148 virtual tree_constant *eval (tree_constant *args, int n_in, int nout, |
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149 int print) |
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150 { assert (0); return NULL_TREE_CONST; } |
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151 |
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152 virtual int save (ostream& os, int mark_as_global = 0) |
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153 { assert (0); return 0; } |
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143
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154 |
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155 virtual int line (void) { return line_num; } |
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156 virtual int column (void) { return column_num; } |
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157 |
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158 protected: |
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159 int line_num; |
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160 int column_num; |
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161 }; |
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162 |
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163 #endif |
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164 |
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165 /* |
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166 ;;; Local Variables: *** |
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167 ;;; mode: C++ *** |
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168 ;;; page-delimiter: "^/\\*" *** |
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169 ;;; End: *** |
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170 */ |
