Panda3D
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00001 // Filename: dcSwitch.h 00002 // Created by: drose (23Jun04) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 #ifndef DCSWITCH_H 00016 #define DCSWITCH_H 00017 00018 #include "dcbase.h" 00019 #include "dcDeclaration.h" 00020 #include "dcPackerInterface.h" 00021 00022 class DCParameter; 00023 class HashGenerator; 00024 class DCField; 00025 00026 //////////////////////////////////////////////////////////////////// 00027 // Class : DCSwitch 00028 // Description : This represents a switch statement, which can appear 00029 // inside a class body and represents two or more 00030 // alternative unpacking schemes based on the first 00031 // field read. 00032 //////////////////////////////////////////////////////////////////// 00033 class EXPCL_DIRECT DCSwitch : public DCDeclaration { 00034 public: 00035 DCSwitch(const string &name, DCField *key_parameter); 00036 virtual ~DCSwitch(); 00037 00038 PUBLISHED: 00039 virtual DCSwitch *as_switch(); 00040 virtual const DCSwitch *as_switch() const; 00041 00042 const string &get_name() const; 00043 DCField *get_key_parameter() const; 00044 00045 int get_num_cases() const; 00046 int get_case_by_value(const string &case_value) const; 00047 DCPackerInterface *get_case(int n) const; 00048 DCPackerInterface *get_default_case() const; 00049 00050 string get_value(int case_index) const; 00051 int get_num_fields(int case_index) const; 00052 DCField *get_field(int case_index, int n) const; 00053 DCField *get_field_by_name(int case_index, const string &name) const; 00054 00055 public: 00056 bool is_field_valid() const; 00057 int add_case(const string &value); 00058 void add_invalid_case(); 00059 bool add_default(); 00060 bool add_field(DCField *field); 00061 void add_break(); 00062 00063 const DCPackerInterface *apply_switch(const char *value_data, size_t length) const; 00064 00065 virtual void output(ostream &out, bool brief) const; 00066 virtual void write(ostream &out, bool brief, int indent_level) const; 00067 void output_instance(ostream &out, bool brief, const string &prename, 00068 const string &name, const string &postname) const; 00069 void write_instance(ostream &out, bool brief, int indent_level, 00070 const string &prename, const string &name, 00071 const string &postname) const; 00072 virtual void generate_hash(HashGenerator &hashgen) const; 00073 virtual bool pack_default_value(DCPackData &pack_data, bool &pack_error) const; 00074 00075 bool do_check_match_switch(const DCSwitch *other) const; 00076 00077 public: 00078 typedef pvector<DCField *> Fields; 00079 typedef pmap<string, DCField *> FieldsByName; 00080 00081 class SwitchFields : public DCPackerInterface { 00082 public: 00083 SwitchFields(const string &name); 00084 ~SwitchFields(); 00085 virtual DCPackerInterface *get_nested_field(int n) const; 00086 00087 bool add_field(DCField *field); 00088 bool do_check_match_switch_case(const SwitchFields *other) const; 00089 00090 void output(ostream &out, bool brief) const; 00091 void write(ostream &out, bool brief, int indent_level) const; 00092 00093 protected: 00094 virtual bool do_check_match(const DCPackerInterface *other) const; 00095 00096 public: 00097 Fields _fields; 00098 FieldsByName _fields_by_name; 00099 bool _has_default_value; 00100 }; 00101 00102 class SwitchCase { 00103 public: 00104 SwitchCase(const string &value, SwitchFields *fields); 00105 ~SwitchCase(); 00106 00107 bool do_check_match_switch_case(const SwitchCase *other) const; 00108 00109 public: 00110 string _value; 00111 SwitchFields *_fields; 00112 }; 00113 00114 private: 00115 SwitchFields *start_new_case(); 00116 00117 private: 00118 string _name; 00119 DCField *_key_parameter; 00120 00121 typedef pvector<SwitchCase *> Cases; 00122 Cases _cases; 00123 SwitchFields *_default_case; 00124 00125 // All SwitchFields created and used by the DCSwitch object are also 00126 // stored here; this is the vector that "owns" the pointers. 00127 typedef pvector<SwitchFields *> CaseFields; 00128 CaseFields _case_fields; 00129 00130 // All nested DCField objects that have been added to one or more of 00131 // the above SwitchFields are also recorded here; this is the vector 00132 // that "owns" these pointers. 00133 Fields _nested_fields; 00134 00135 // These are the SwitchFields that are currently being filled up 00136 // during this stage of the parser. There might be more than one at 00137 // a time, if we have multiple cases being introduced in the middle 00138 // of a series of fields (without a break statement intervening). 00139 CaseFields _current_fields; 00140 bool _fields_added; 00141 00142 // This map indexes into the _cases vector, above. 00143 typedef pmap<string, int> CasesByValue; 00144 CasesByValue _cases_by_value; 00145 }; 00146 00147 #endif