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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_stmt_h) |
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24 #define octave_tree_stmt_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 <SLList.h> |
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31 |
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32 class octave_value_list; |
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33 |
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34 class tree_command; |
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35 class tree_expression; |
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36 |
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37 class tree_walker; |
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38 |
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39 // A statement is either a command to execute or an expression to |
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40 // evaluate. |
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41 |
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42 class |
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43 tree_statement |
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44 { |
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45 public: |
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46 |
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47 tree_statement (void) |
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48 : cmd (0), expr (0), print_flag (true) { } |
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49 |
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50 tree_statement (tree_command *c) |
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51 : cmd (c), expr (0), print_flag (true) { } |
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52 |
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53 tree_statement (tree_expression *e) |
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54 : cmd (0), expr (e), print_flag (true) { } |
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55 |
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56 ~tree_statement (void); |
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57 |
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58 void set_print_flag (bool print) |
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59 { print_flag = print; } |
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60 |
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61 bool is_command (void) |
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62 { return cmd != 0; } |
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63 |
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64 bool is_expression (void) |
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65 { return expr != 0; } |
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66 |
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67 int line (void); |
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68 int column (void); |
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69 |
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70 void maybe_echo_code (bool in_function_body); |
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71 |
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72 bool print_result (void) { return print_flag; } |
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73 |
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74 tree_command *command (void) { return cmd; } |
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75 |
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76 octave_value_list eval (bool silent, int nargout, bool in_function_body); |
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77 |
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78 tree_expression *expression (void) { return expr; } |
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79 |
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80 void accept (tree_walker& tw); |
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81 |
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82 private: |
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83 |
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84 // Only one of cmd or expr can be valid at once. |
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85 |
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86 // Command to execute. |
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87 tree_command *cmd; |
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88 |
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89 // Expression to evaluate. |
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90 tree_expression *expr; |
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91 |
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92 // Print result of eval for this command? |
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93 bool print_flag; |
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94 }; |
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95 |
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96 // A list of statements to evaluate. |
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97 |
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98 class |
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99 tree_statement_list : public SLList<tree_statement *> |
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100 { |
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101 public: |
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102 |
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103 tree_statement_list (void) |
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104 : SLList<tree_statement *> (), function_body (false) { } |
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105 |
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106 tree_statement_list (tree_statement *s) |
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107 : SLList<tree_statement *> (), function_body (false) { append (s); } |
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108 |
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109 ~tree_statement_list (void) |
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110 { |
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111 while (! empty ()) |
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112 { |
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113 tree_statement *t = remove_front (); |
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114 delete t; |
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115 } |
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116 } |
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117 |
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118 void mark_as_function_body (void) { function_body = true; } |
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119 |
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120 octave_value_list eval (bool silent = false, int nargout = 0); |
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121 |
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122 void accept (tree_walker& tw); |
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123 |
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124 private: |
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125 |
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126 // Does this list of statements make up the body of a function? |
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127 bool function_body; |
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128 }; |
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129 |
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130 #endif |
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131 |
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132 /* |
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133 ;;; Local Variables: *** |
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134 ;;; mode: C++ *** |
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135 ;;; End: *** |
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136 */ |
