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annotate src/pt-cmd.h @ 8844:c84a5b6377c4

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better handling of end of script/function no-op command
author John W. Eaton <jwe@octave.org>
date Mon, 23 Feb 2009 12:55:32 -0500
parents 73c4516fae10
children 35cd375d4bb3
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 2000, 2001, 2002, 2004, 2005,
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4 2006, 2007 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 3 of the License, or (at your
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11 option) any 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, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #if !defined (octave_tree_cmd_h)
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25 #define octave_tree_cmd_h 1
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26
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27 #include <string>
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28
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29 class tree_walker;
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30
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31 #include "ov-fcn.h"
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32 #include "pt.h"
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33 #include "pt-bp.h"
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34 #include "symtab.h"
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35
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36 // A base class for commands.
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37
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38 class
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39 tree_command : public tree
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40 {
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41 public:
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42
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43 tree_command (int l = -1, int c = -1)
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44 : tree (l, c) { }
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45
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46 virtual ~tree_command (void) { }
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47
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48 virtual tree_command *dup (symbol_table::scope_id,
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49 symbol_table::context_id context) = 0;
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50
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51 private:
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52
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53 // No copying!
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54
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55 tree_command (const tree_command&);
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56
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57 tree_command& operator = (const tree_command&);
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58 };
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59
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60 // No-op.
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61
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62 class
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63 tree_no_op_command : public tree_command
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64 {
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65 public:
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66
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67 tree_no_op_command (const std::string& cmd = "no_op", int l = -1, int c = -1)
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68 : tree_command (l, c), eof (cmd == "endfunction" || cmd == "endscript"),
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69 orig_cmd (cmd) { }
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71 ~tree_no_op_command (void) { }
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72
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73 tree_command *dup (symbol_table::scope_id scope,
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74 symbol_table::context_id context);
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75
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76 void accept (tree_walker& tw);
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77
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78 bool is_end_of_fcn_or_script (void) const { return eof; }
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79
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80 std::string original_command (void) { return orig_cmd; }
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81
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82 private:
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83
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84 bool eof;
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85
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86 std::string orig_cmd;
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87
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88 // No copying!
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89
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90 tree_no_op_command (const tree_no_op_command&);
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91
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92 tree_no_op_command& operator = (const tree_no_op_command&);
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93 };
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94
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95 // Function definition.
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96
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97 class
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98 tree_function_def : public tree_command
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99 {
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100 public:
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101
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102 tree_function_def (octave_function *f, int l = -1, int c = -1)
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103 : tree_command (l, c), fcn (f) { }
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104
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105 ~tree_function_def (void) { }
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106
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107 tree_command *dup (symbol_table::scope_id scope,
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108 symbol_table::context_id context);
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109
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110 void accept (tree_walker& tw);
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111
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112 octave_value function (void) { return fcn; }
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113
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114 private:
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115
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116 octave_value fcn;
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117
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118 tree_function_def (const octave_value& v, int l = -1, int c = -1)
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119 : tree_command (l, c), fcn (v) { }
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120
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121 // No copying!
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122
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123 tree_function_def (const tree_function_def&);
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124
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125 tree_function_def& operator = (const tree_function_def&);
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126 };
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127
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128 #endif
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129
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130 /*
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131 ;;; Local Variables: ***
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132 ;;; mode: C++ ***
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133 ;;; End: ***
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134 */