1/**************************************************************************** 2* 3* wxWindows HTML Applet Package 4* 5* Copyright (C) 1991-2001 SciTech Software, Inc. 6* All rights reserved. 7* 8* ======================================================================== 9* 10* The contents of this file are subject to the wxWindows License 11* Version 3.0 (the "License"); you may not use this file except in 12* compliance with the License. You may obtain a copy of the License at 13* http://www.wxwindows.org/licence3.txt 14* 15* Software distributed under the License is distributed on an 16* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 17* implied. See the License for the specific language governing 18* rights and limitations under the License. 19* 20* ======================================================================== 21* 22* Language: ANSI C++ 23* Environment: Any 24* 25* Description: Header file for wxIfElseVariable Class, Dynamically constructed 26* objects representing variables in SSI #if, #else and #endif directives 27* 28****************************************************************************/ 29 30#ifndef __WX_IFELSEVAR_H 31#define __WX_IFELSEVAR_H 32 33#include "wx/object.h" 34#include "wx/hash.h" 35 36/*--------------------------- Class Definitions ---------------------------*/ 37 38/**************************************************************************** 39RETURNS: 40The boolean value of the variable 41 42REMARKS: 43To create new variables for the #if, #else and #endif HTML preprocessing 44blocks you need to derive classes from wxIfElseVariable and override the 45pure virtual GetValue function. However this should not be done directly 46but by using the BEGIN_IFELSE_VARIABLE and END_IFELSE_VARIABLE macros 47 48SEE ALSO: 49wxIfElsePrep, BEGIN_IFELSE_VARIABLE, END_IFELSE_VARIABLE 50****************************************************************************/ 51typedef bool (*wxIfElseVariableGetValueFn)(); 52 53/**************************************************************************** 54REMARKS: 55wxIfElseVariable class Definition 56****************************************************************************/ 57class wxIfElseVariable : public wxObject { 58protected: 59 const wxChar *m_varName; 60 wxIfElseVariableGetValueFn m_getValueFn; 61 static wxIfElseVariable *sm_first; 62 wxIfElseVariable *m_next; 63 static wxHashTable *sm_varTable; 64 bool forced; 65 bool forceVal; 66 67 static inline wxIfElseVariable *wxIfElseVariable::FindVariable(const wxChar *varName); 68 69public: 70 // Constructor to create the echo variable and register the class 71 wxIfElseVariable( 72 const char *varName, 73 wxIfElseVariableGetValueFn getValueFn); 74 75 // Member variable access functions 76 const wxChar *GetClassName() const { return m_varName; } 77 wxIfElseVariableGetValueFn GetValueFn() const { return m_getValueFn; } 78 static const wxIfElseVariable* GetFirst() { return sm_first; } 79 const wxIfElseVariable* GetNext() const { return m_next; } 80 81 // Static functions to retrieve any variable avaliable 82 static bool GetValue(const wxChar *varName); 83 static bool Exists(const wxChar *varName); 84 static void Force(const wxChar *varName, bool val); 85 86 // Initializes parent pointers and hash table for fast searching. 87 static void Initialize(); 88 89 // Cleans up hash table used for fast searching. 90 static void CleanUp(); 91 }; 92 93/**************************************************************************** 94PARAMETERS: 95class - Name of class for echo variable to find 96 97RETURNS: 98Pointer to the echo variable class 99 100REMARKS: 101Inline helper function to find the echo variable from it's class name. 102****************************************************************************/ 103inline wxIfElseVariable *wxIfElseVariable::FindVariable( 104 const wxChar *varName) 105{ 106 if (sm_varTable) 107 return (wxIfElseVariable*)sm_varTable->Get(varName); 108 else { 109 wxIfElseVariable *info = sm_first; 110 while (info) { 111 if (info->m_varName && wxStrcmp(info->m_varName, varName) == 0) 112 return info; 113 info = info->m_next; 114 } 115 return NULL; 116 } 117} 118 119/*--------------------------------- MACROS --------------------------------*/ 120 121#define BEGIN_IFELSE_VARIABLE(name) \ 122bool wxIfElseVariableFn##name(); \ 123wxIfElseVariable wxIfElseVariable##name(#name,wxIfElseVariableFn##name); \ 124bool wxIfElseVariableFn##name() { \ 125 126#define END_IFELSE_VARIABLE(returnval) \ 127 return returnval; \ 128 } 129 130#define IFELSE_VARIABLE(name, state) \ 131 BEGIN_IFELSE_VARIABLE(##name##); \ 132 END_IFELSE_VARIABLE(bool (state)) 133 134#endif // __WX_IFELSEVAR_H 135 136