pt-stmt.h

Go to the documentation of this file.
00001 /*
00002 
00003 Copyright (C) 1996-2012 John W. Eaton
00004 
00005 This file is part of Octave.
00006 
00007 Octave is free software; you can redistribute it and/or modify it
00008 under the terms of the GNU General Public License as published by the
00009 Free Software Foundation; either version 3 of the License, or (at your
00010 option) any later version.
00011 
00012 Octave is distributed in the hope that it will be useful, but WITHOUT
00013 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00014 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
00015 for more details.
00016 
00017 You should have received a copy of the GNU General Public License
00018 along with Octave; see the file COPYING.  If not, see
00019 <http://www.gnu.org/licenses/>.
00020 
00021 */
00022 
00023 #if !defined (octave_tree_stmt_h)
00024 #define octave_tree_stmt_h 1
00025 
00026 class octave_value_list;
00027 
00028 class tree_command;
00029 class tree_expression;
00030 
00031 class tree_walker;
00032 
00033 #include <deque>
00034 
00035 #include "base-list.h"
00036 #include "comment-list.h"
00037 #include "symtab.h"
00038 
00039 // A statement is either a command to execute or an expression to
00040 // evaluate.
00041 
00042 class
00043 tree_statement
00044 {
00045 public:
00046 
00047   tree_statement (void)
00048     : cmd (0), expr (0), comm (0) { }
00049 
00050   tree_statement (tree_command *c, octave_comment_list *cl)
00051     : cmd (c), expr (0), comm (cl) { }
00052 
00053   tree_statement (tree_expression *e, octave_comment_list *cl)
00054     : cmd (0), expr (e), comm (cl) { }
00055 
00056   ~tree_statement (void);
00057 
00058   void set_print_flag (bool print_flag);
00059 
00060   bool print_result (void);
00061 
00062   bool is_command (void) const { return cmd != 0; }
00063 
00064   bool is_expression (void) const { return expr != 0; }
00065 
00066   void set_breakpoint (void);
00067 
00068   void delete_breakpoint (void);
00069 
00070   bool is_breakpoint (void) const;
00071 
00072   int line (void) const;
00073   int column (void) const;
00074 
00075   void echo_code (void);
00076 
00077   tree_command *command (void) { return cmd; }
00078 
00079   tree_expression *expression (void) { return expr; }
00080 
00081   octave_comment_list *comment_text (void) { return comm; }
00082 
00083   bool is_null_statement (void) const { return ! (cmd || expr || comm); }
00084 
00085   bool is_end_of_fcn_or_script (void) const;
00086 
00087   // Allow modification of this statement.  Note that there is no
00088   // checking.  If you use these, are you sure you knwo what you are
00089   // doing?
00090 
00091   void set_command (tree_command *c) { cmd = c; }
00092 
00093   void set_expression (tree_expression *e) { expr = e; }
00094 
00095   tree_statement *dup (symbol_table::scope_id scope,
00096                        symbol_table::context_id context) const;
00097 
00098   void accept (tree_walker& tw);
00099 
00100 private:
00101 
00102   // Only one of cmd or expr can be valid at once.
00103 
00104   // Command to execute.
00105   tree_command *cmd;
00106 
00107   // Expression to evaluate.
00108   tree_expression *expr;
00109 
00110   // Comment associated with this statement.
00111   octave_comment_list *comm;
00112 
00113   // No copying!
00114   tree_statement (const tree_statement&);
00115 
00116   tree_statement& operator = (const tree_statement&);
00117 };
00118 
00119 // A list of statements to evaluate.
00120 
00121 class
00122 tree_statement_list : public octave_base_list<tree_statement *>
00123 {
00124 public:
00125 
00126   tree_statement_list (void)
00127     : function_body (false), anon_function_body (false),
00128       script_body (false) { }
00129 
00130   tree_statement_list (tree_statement *s)
00131     : function_body (false), anon_function_body (false),
00132       script_body (false) { append (s); }
00133 
00134   ~tree_statement_list (void)
00135     {
00136       while (! empty ())
00137         {
00138           iterator p = begin ();
00139           delete *p;
00140           erase (p);
00141         }
00142     }
00143 
00144   void mark_as_function_body (void) { function_body = true; }
00145 
00146   void mark_as_anon_function_body (void) { anon_function_body = true; }
00147 
00148   void mark_as_script_body (void) { script_body = true; }
00149 
00150   bool is_function_body (void) const { return function_body; }
00151 
00152   bool is_anon_function_body (void) const { return anon_function_body; }
00153 
00154   bool is_script_body (void) const { return script_body; }
00155 
00156   int set_breakpoint (int line);
00157 
00158   void delete_breakpoint (int line);
00159 
00160   octave_value_list list_breakpoints (void);
00161 
00162   tree_statement_list *dup (symbol_table::scope_id scope,
00163                             symbol_table::context_id context) const;
00164 
00165   void accept (tree_walker& tw);
00166 
00167 private:
00168 
00169   // Does this list of statements make up the body of a function?
00170   bool function_body;
00171 
00172   // Does this list of statements make up the body of a function?
00173   bool anon_function_body;
00174 
00175   // Does this list of statements make up the body of a script?
00176   bool script_body;
00177 
00178   // No copying!
00179 
00180   tree_statement_list (const tree_statement_list&);
00181 
00182   tree_statement_list& operator = (const tree_statement_list&);
00183 };
00184 
00185 #endif
 All Classes Files Functions Variables Typedefs Enumerations Enumerator Friends Defines