added macros to avoid code repetition when defining comparison operators; use them...

[wxWidgets.git] / include / wx / confbase.h

diff --git a/include/wx/confbase.h b/include/wx/confbase.h
index af05537a6ce793f02600a247932b10709b8a2354..bccafa801eafca7ca91323ec059211648c482347 100644 (file)
--- a/include/wx/confbase.h
+++ b/include/wx/confbase.h
@@ -1,31 +1,24 @@
 ///////////////////////////////////////////////////////////////////////////////
 // Name:        confbase.h
 // Purpose:     declaration of the base class of all config implementations
 ///////////////////////////////////////////////////////////////////////////////
 // Name:        confbase.h
 // Purpose:     declaration of the base class of all config implementations

-//              (see also: fileconf.h and msw/regconf.h)
+//              (see also: fileconf.h and msw/regconf.h and iniconf.h)

 // Author:      Karsten Ballüder & Vadim Zeitlin
 // Modified by:
 // Created:     07.04.98 (adapted from appconf.h)
 // RCS-ID:      $Id$
 // Copyright:   (c) 1997 Karsten Ballüder   Ballueder@usa.net
 //                       Vadim Zeitlin      <zeitlin@dptmaths.ens-cachan.fr>
 // Author:      Karsten Ballüder & Vadim Zeitlin
 // Modified by:
 // Created:     07.04.98 (adapted from appconf.h)
 // RCS-ID:      $Id$
 // Copyright:   (c) 1997 Karsten Ballüder   Ballueder@usa.net
 //                       Vadim Zeitlin      <zeitlin@dptmaths.ens-cachan.fr>

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 ///////////////////////////////////////////////////////////////////////////////
 
 ///////////////////////////////////////////////////////////////////////////////
 

-#ifndef   _WX_CONFBASE_H_
-#define   _WX_CONFBASE_H_
+#ifndef _WX_CONFBASE_H_
+#define _WX_CONFBASE_H_

 
 

-#ifdef __GNUG__
-#pragma interface "confbase.h"
-#endif
-
-// ----------------------------------------------------------------------------
-// compile options
-// ----------------------------------------------------------------------------
+#include "wx/defs.h"
+#include "wx/string.h"
+#include "wx/object.h"

 
 

-// it won't compile without it anyhow
-#ifndef wxUSE_CONFIG
-  #error "Please define wxUSE_CONFIG or remove config.cpp from your makefile"
-#endif // wxUSE_CONFIG
+class WXDLLIMPEXP_BASE wxArrayString;

 
 // ----------------------------------------------------------------------------
 // constants
 
 // ----------------------------------------------------------------------------
 // constants


@@ -33,50 +26,43 @@
 
 /// shall we be case sensitive in parsing variable names?
 #ifndef wxCONFIG_CASE_SENSITIVE
 
 /// shall we be case sensitive in parsing variable names?
 #ifndef wxCONFIG_CASE_SENSITIVE

-  #define  wxCONFIG_CASE_SENSITIVE       FALSE
+  #define  wxCONFIG_CASE_SENSITIVE       0

 #endif
 
 /// separates group and entry names (probably shouldn't be changed)
 #ifndef wxCONFIG_PATH_SEPARATOR
 #endif
 
 /// separates group and entry names (probably shouldn't be changed)
 #ifndef wxCONFIG_PATH_SEPARATOR

-  #define   wxCONFIG_PATH_SEPARATOR     '/'
+  #define   wxCONFIG_PATH_SEPARATOR     _T('/')

 #endif
 
 /// introduces immutable entries
 // (i.e. the ones which can't be changed from the local config file)
 #ifndef wxCONFIG_IMMUTABLE_PREFIX
 #endif
 
 /// introduces immutable entries
 // (i.e. the ones which can't be changed from the local config file)
 #ifndef wxCONFIG_IMMUTABLE_PREFIX

-  #define   wxCONFIG_IMMUTABLE_PREFIX   '!'
+  #define   wxCONFIG_IMMUTABLE_PREFIX   _T('!')

 #endif
 
 #endif
 

-/// should we use registry instead of configuration files under Win32?
+#if wxUSE_CONFIG
+
+#include "wx/string.h"
+
+/// should we use registry instead of configuration files under Windows?

 // (i.e. whether wxConfigBase::Create() will create a wxFileConfig (if it's
 // (i.e. whether wxConfigBase::Create() will create a wxFileConfig (if it's

-//  FALSE) or wxRegConfig (if it's true and we're under Win32) or wxIniConfig
-//  (under Win16))
-#ifndef   wxCONFIG_WIN32_NATIVE
-  #define wxCONFIG_WIN32_NATIVE          TRUE
+//  false) or wxRegConfig (if it's true and we're under Win32))
+#ifndef   wxUSE_CONFIG_NATIVE
+  #define wxUSE_CONFIG_NATIVE 1

 #endif
 
 // Style flags for constructor style parameter
 #endif
 
 // Style flags for constructor style parameter

-#define wxCONFIG_USE_LOCAL_FILE         1
-#define wxCONFIG_USE_GLOBAL_FILE        2
-
-// ----------------------------------------------------------------------------
-// various helper global functions
-// ----------------------------------------------------------------------------
-
-/*
-  Replace environment variables ($SOMETHING) with their values. The format is
-  $VARNAME or ${VARNAME} where VARNAME contains alphanumeric characters and
-  '_' only. '$' must be escaped ('\$') in order to be taken literally.
- */
-extern wxString wxExpandEnvVars(const wxString &sz);
-
-/*
-  Split path into parts removing '..' in progress
- */
-extern void wxSplitPath(wxArrayString& aParts, const char *sz);
+enum
+{
+    wxCONFIG_USE_LOCAL_FILE = 1,
+    wxCONFIG_USE_GLOBAL_FILE = 2,
+    wxCONFIG_USE_RELATIVE_PATH = 4,
+    wxCONFIG_USE_NO_ESCAPE_CHARACTERS = 8,
+    wxCONFIG_USE_SUBDIR = 16
+};

 
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------

-// abstract base class wxConfigBase which defines the interface for derived 
+// abstract base class wxConfigBase which defines the interface for derived

 // classes
 //
 // wxConfig organizes the items in a tree-like structure (modeled after the
 // classes
 //
 // wxConfig organizes the items in a tree-like structure (modeled after the


@@ -84,40 +70,52 @@ extern void wxSplitPath(wxArrayString& aParts, const char *sz);
 // There is always one current group given by the current path.
 //
 // Keys are pairs "key_name = value" where value may be of string or integer
 // There is always one current group given by the current path.
 //
 // Keys are pairs "key_name = value" where value may be of string or integer

-// (long) type (@@@ doubles and other types such as wxDate coming soon).
+// (long) type (TODO doubles and other types such as wxDate coming soon).

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-class wxConfigBase
+
+class WXDLLIMPEXP_BASE wxConfigBase : public wxObject

 {
 public:
 {
 public:

+  // constants
+    // the type of an entry
+  enum EntryType
+  {
+    Type_Unknown,
+    Type_String,
+    Type_Boolean,
+    Type_Integer,    // use Read(long *)
+    Type_Float       // use Read(double *)
+  };
+

   // static functions
     // sets the config object, returns the previous pointer
   static wxConfigBase *Set(wxConfigBase *pConfig);
     // get the config object, creates it on demand unless DontCreateOnDemand
     // was called
   // static functions
     // sets the config object, returns the previous pointer
   static wxConfigBase *Set(wxConfigBase *pConfig);
     // get the config object, creates it on demand unless DontCreateOnDemand
     // was called

-  static wxConfigBase *Get() { if ( !ms_pConfig ) Create(); return ms_pConfig; }
+  static wxConfigBase *Get(bool createOnDemand = true)
+       { if ( createOnDemand && (!ms_pConfig) ) Create(); return ms_pConfig; }

     // create a new config object: this function will create the "best"
     // implementation of wxConfig available for the current platform, see
     // create a new config object: this function will create the "best"
     // implementation of wxConfig available for the current platform, see

-    // comments near definition wxCONFIG_WIN32_NATIVE for details. It returns
+    // comments near definition wxUSE_CONFIG_NATIVE for details. It returns

     // the created object and also sets it as ms_pConfig.
   static wxConfigBase *Create();
     // should Get() try to create a new log object if the current one is NULL?
     // the created object and also sets it as ms_pConfig.
   static wxConfigBase *Create();
     // should Get() try to create a new log object if the current one is NULL?

-  static void DontCreateOnDemand() { ms_bAutoCreate = FALSE; }
+  static void DontCreateOnDemand() { ms_bAutoCreate = false; }

 
   // ctor & virtual dtor
 
   // ctor & virtual dtor

-    // environment variable expansion is on by default
-//  wxConfigBase() { m_bExpandEnvVars = TRUE; m_bRecordDefaults = FALSE; }
-
-  // ctor
-
-  // Not all args will always be used by derived classes, but
-  // including them all in each class ensures compatibility.
-  // If appName is empty, uses wxApp name
-  wxConfigBase(const wxString& appName = "", const wxString& vendorName = "",
-               const wxString& localFilename = "", const wxString& globalFilename = "",
+      // ctor (can be used as default ctor too)
+      //
+      // Not all args will always be used by derived classes, but including
+      // them all in each class ensures compatibility. If appName is empty,
+      // uses wxApp name
+  wxConfigBase(const wxString& appName = wxEmptyString,
+               const wxString& vendorName = wxEmptyString,
+               const wxString& localFilename = wxEmptyString,
+               const wxString& globalFilename = wxEmptyString,

                long style = 0);
 
     // empty but ensures that dtor of all derived classes is virtual
                long style = 0);
 
     // empty but ensures that dtor of all derived classes is virtual

-  virtual ~wxConfigBase() { }
+  virtual ~wxConfigBase();

 
   // path management
     // set current path: if the first character is '/', it's the absolute path,
 
   // path management
     // set current path: if the first character is '/', it's the absolute path,


@@ -137,102 +135,157 @@ public:
   virtual bool GetNextEntry (wxString& str, long& lIndex) const = 0;
     // get number of entries/subgroups in the current group, with or without
     // it's subgroups
   virtual bool GetNextEntry (wxString& str, long& lIndex) const = 0;
     // get number of entries/subgroups in the current group, with or without
     // it's subgroups

-  virtual size_t GetNumberOfEntries(bool bRecursive = FALSE) const = 0;
-  virtual size_t GetNumberOfGroups(bool bRecursive = FALSE) const = 0;
+  virtual size_t GetNumberOfEntries(bool bRecursive = false) const = 0;
+  virtual size_t GetNumberOfGroups(bool bRecursive = false) const = 0;

 
   // tests of existence
 
   // tests of existence

-    // returns TRUE if the group by this name exists
+    // returns true if the group by this name exists

   virtual bool HasGroup(const wxString& strName) const = 0;
     // same as above, but for an entry
   virtual bool HasEntry(const wxString& strName) const = 0;
   virtual bool HasGroup(const wxString& strName) const = 0;
     // same as above, but for an entry
   virtual bool HasEntry(const wxString& strName) const = 0;

-    // returns TRUE if either a group or an entry with a given name exist
+    // returns true if either a group or an entry with a given name exist

   bool Exists(const wxString& strName) const
     { return HasGroup(strName) || HasEntry(strName); }
 
   bool Exists(const wxString& strName) const
     { return HasGroup(strName) || HasEntry(strName); }
 

-  // key access: returns TRUE if value was really read, FALSE if default used
+    // get the entry type
+  virtual EntryType GetEntryType(const wxString& name) const
+  {
+    // by default all entries are strings
+    return HasEntry(name) ? Type_String : Type_Unknown;
+  }
+
+  // key access: returns true if value was really read, false if default used

   // (and if the key is not found the default value is returned.)
   // (and if the key is not found the default value is returned.)

+

     // read a string from the key
     // read a string from the key

-  virtual bool Read(const wxString& key, wxString *pStr) const = 0;
-  virtual bool Read(const wxString& key, wxString *pStr, const wxString& defVal) const;
+  bool Read(const wxString& key, wxString *pStr) const;
+  bool Read(const wxString& key, wxString *pStr, const wxString& defVal) const;
+
+    // read a number (long)
+  bool Read(const wxString& key, long *pl) const;
+  bool Read(const wxString& key, long *pl, long defVal) const;

 
 

-  virtual wxString Read(const wxString& key, const wxString& defVal = "") const;
+    // read an int
+  bool Read(const wxString& key, int *pi) const;
+  bool Read(const wxString& key, int *pi, int defVal) const;

 
 

-  virtual bool Read(const wxString& key, long *pl) const = 0;
-  virtual bool Read(const wxString& key, long *pl, long defVal) const;
+    // read a double
+  bool Read(const wxString& key, double* val) const;
+  bool Read(const wxString& key, double* val, double defVal) const;

 
 

-  virtual long Read(const wxString& strKey, long defVal) const
-    { long l; Read(strKey, &l, defVal); return l; }
+    // read a bool
+  bool Read(const wxString& key, bool* val) const;
+  bool Read(const wxString& key, bool* val, bool defVal) const;

 
 

-  // Convenience functions that are built on other forms
-  // double
-  virtual bool Read(const wxString& key, double* val) const;
-  virtual bool Read(const wxString& key, double* val, double defVal) const;
+  // convenience functions returning directly the value (we don't have them for
+  // int/double/bool as there would be ambiguities with the long one then)
+  wxString Read(const wxString& key,
+                const wxString& defVal = wxEmptyString) const
+    { wxString s; (void)Read(key, &s, defVal); return s; }

 
 

-  // bool
-  virtual bool Read(const wxString& key, bool* val) const;
-  virtual bool Read(const wxString& key, bool* val, bool defVal) const;
+  long Read(const wxString& key, long defVal) const
+    { long l; (void)Read(key, &l, defVal); return l; }

 
     // write the value (return true on success)
 
     // write the value (return true on success)

-  virtual bool Write(const wxString& key, const wxString& value) = 0;
-  virtual bool Write(const wxString& key, long value) = 0;
+  bool Write(const wxString& key, const wxString& value)
+    { return DoWriteString(key, value); }
+
+  bool Write(const wxString& key, long value)
+    { return DoWriteLong(key, value); }
+
+  bool Write(const wxString& key, int value)
+    { return DoWriteInt(key, value); }
+
+  bool Write(const wxString& key, double value)
+    { return DoWriteDouble(key, value); }
+
+  bool Write(const wxString& key, bool value)
+    { return DoWriteBool(key, value); }
+
+  // we have to provide a separate version for C strings as otherwise they
+  // would be converted to bool and not to wxString as expected!
+  bool Write(const wxString& key, const char *value)
+    { return Write(key, wxString(value)); }
+#if wxUSE_WCHAR_T
+  bool Write(const wxString& key, const wchar_t *value)
+    { return Write(key, wxString(value)); }
+#endif

 
 

-  // Convenience functions
-  virtual bool Write(const wxString& key, double value);
-  virtual bool Write(const wxString& key, bool value);
+  // permanently writes all changes
+  virtual bool Flush(bool bCurrentOnly = false) = 0;

 
 

-    // permanently writes all changes
-  virtual bool Flush(bool bCurrentOnly = FALSE) = 0;
+  // renaming, all functions return false on failure (probably because the new
+  // name is already taken by an existing entry)
+    // rename an entry
+  virtual bool RenameEntry(const wxString& oldName,
+                           const wxString& newName) = 0;
+    // rename a group
+  virtual bool RenameGroup(const wxString& oldName,
+                           const wxString& newName) = 0;

 
   // delete entries/groups
     // deletes the specified entry and the group it belongs to if
     // it was the last key in it and the second parameter is true
   virtual bool DeleteEntry(const wxString& key,
 
   // delete entries/groups
     // deletes the specified entry and the group it belongs to if
     // it was the last key in it and the second parameter is true
   virtual bool DeleteEntry(const wxString& key,

-                           bool bDeleteGroupIfEmpty = TRUE) = 0;
+                           bool bDeleteGroupIfEmpty = true) = 0;

     // delete the group (with all subgroups)
   virtual bool DeleteGroup(const wxString& key) = 0;
     // delete the whole underlying object (disk file, registry key, ...)
     // delete the group (with all subgroups)
   virtual bool DeleteGroup(const wxString& key) = 0;
     // delete the whole underlying object (disk file, registry key, ...)

-    // primarly for use by desinstallation routine.
+    // primarily for use by uninstallation routine.

   virtual bool DeleteAll() = 0;
 
   // options
     // we can automatically expand environment variables in the config entries
     // (this option is on by default, you can turn it on/off at any time)
   bool IsExpandingEnvVars() const { return m_bExpandEnvVars; }
   virtual bool DeleteAll() = 0;
 
   // options
     // we can automatically expand environment variables in the config entries
     // (this option is on by default, you can turn it on/off at any time)
   bool IsExpandingEnvVars() const { return m_bExpandEnvVars; }

-  void SetExpandEnvVars(bool bDoIt = TRUE) { m_bExpandEnvVars = bDoIt; }
+  void SetExpandEnvVars(bool bDoIt = true) { m_bExpandEnvVars = bDoIt; }

     // recording of default values
     // recording of default values

-  void SetRecordDefaults(bool bDoIt = TRUE) { m_bRecordDefaults = bDoIt; }
+  void SetRecordDefaults(bool bDoIt = true) { m_bRecordDefaults = bDoIt; }

   bool IsRecordingDefaults() const { return m_bRecordDefaults; }
   // does expansion only if needed
   bool IsRecordingDefaults() const { return m_bRecordDefaults; }
   // does expansion only if needed

-  wxString ExpandEnvVars(const wxString& str) const
-    {
-        wxString tmp; // Required for BC++
-        if (IsExpandingEnvVars())
-            tmp = wxExpandEnvVars(str);
-        else
-            tmp = str;
-        return tmp;
-    }
+  wxString ExpandEnvVars(const wxString& str) const;

 
     // misc accessors
 
     // misc accessors

-  inline wxString GetAppName() const { return m_appName; }
-  inline wxString GetVendorName() const { return m_vendorName; }
+  wxString GetAppName() const { return m_appName; }
+  wxString GetVendorName() const { return m_vendorName; }

 
 

-  inline void SetAppName(const wxString& appName) { m_appName = appName; }
-  inline void SetVendorName(const wxString& vendorName) { m_vendorName = vendorName; }
+  // Used wxIniConfig to set members in constructor
+  void SetAppName(const wxString& appName) { m_appName = appName; }
+  void SetVendorName(const wxString& vendorName) { m_vendorName = vendorName; }

 
 

-  inline void SetStyle(long style) { m_style = style; }
-  inline long GetStyle() const { return m_style; }
+  void SetStyle(long style) { m_style = style; }
+  long GetStyle() const { return m_style; }

 
 protected:
   static bool IsImmutable(const wxString& key)
 
 protected:
   static bool IsImmutable(const wxString& key)

-    { return key[0] == wxCONFIG_IMMUTABLE_PREFIX; }
+    { return !key.IsEmpty() && key[0] == wxCONFIG_IMMUTABLE_PREFIX; }
+
+  // return the path without trailing separator, if any: this should be called
+  // to sanitize paths referring to the group names before passing them to
+  // wxConfigPathChanger as "/foo/bar/" should be the same as "/foo/bar" and it
+  // isn't interpreted in the same way by it (and this can't be changed there
+  // as it's not the same for the entries names)
+  static wxString RemoveTrailingSeparator(const wxString& key);
+
+  // do read/write the values of different types
+  virtual bool DoReadString(const wxString& key, wxString *pStr) const = 0;
+  virtual bool DoReadLong(const wxString& key, long *pl) const = 0;
+  virtual bool DoReadInt(const wxString& key, int *pi) const;
+  virtual bool DoReadDouble(const wxString& key, double* val) const;
+  virtual bool DoReadBool(const wxString& key, bool* val) const;
+
+  virtual bool DoWriteString(const wxString& key, const wxString& value) = 0;
+  virtual bool DoWriteLong(const wxString& key, long value) = 0;
+  virtual bool DoWriteInt(const wxString& key, int value);
+  virtual bool DoWriteDouble(const wxString& key, double value);
+  virtual bool DoWriteBool(const wxString& key, bool value);

 
 private:
   // are we doing automatic environment variable expansion?
   bool m_bExpandEnvVars;
   // do we record default values?
   bool m_bRecordDefaults;
 
 private:
   // are we doing automatic environment variable expansion?
   bool m_bExpandEnvVars;
   // do we record default values?
   bool m_bRecordDefaults;

-  
+

   // static variables
   static wxConfigBase *ms_pConfig;
   static bool          ms_bAutoCreate;
   // static variables
   static wxConfigBase *ms_pConfig;
   static bool          ms_bAutoCreate;


@@ -243,29 +296,41 @@ private:
 
   // Style flag
   long              m_style;
 
   // Style flag
   long              m_style;

+
+  DECLARE_ABSTRACT_CLASS(wxConfigBase)

 };
 
 };
 

-  // a handy little class which changes current path to the path of given entry
-  // and restores it in dtor: so if you declare a local variable of this type,
-  // you work in the entry directory and the path is automatically restored
-  // when the function returns
-  // Taken out of wxConfig since not all compilers can cope with nested classes.
-  class wxConfigPathChanger
-  {
-  public:
-    // ctor/dtor do path changing/restorin
-    wxConfigPathChanger(const wxConfigBase *pContainer, const wxString& strEntry);
-   ~wxConfigPathChanger();
-
-    // get the key name
-    const wxString& Name() const { return m_strName; }
-
-  private:
-    wxConfigBase *m_pContainer;   // object we live in
-    wxString      m_strName,      // name of entry (i.e. name only)
-                  m_strOldPath;   // saved path
-    bool          m_bChanged;     // was the path changed?
-  };
+// a handy little class which changes current path to the path of given entry
+// and restores it in dtor: so if you declare a local variable of this type,
+// you work in the entry directory and the path is automatically restored
+// when the function returns
+// Taken out of wxConfig since not all compilers can cope with nested classes.
+class WXDLLIMPEXP_BASE wxConfigPathChanger
+{
+public:
+  // ctor/dtor do path changing/restoring of the path
+  wxConfigPathChanger(const wxConfigBase *pContainer, const wxString& strEntry);
+ ~wxConfigPathChanger();
+
+  // get the key name
+  const wxString& Name() const { return m_strName; }
+
+  // this method must be called if the original path (i.e. the current path at
+  // the moment of creation of this object) could have been deleted to prevent
+  // us from restoring the not existing (any more) path
+  //
+  // if the original path doesn't exist any more, the path will be restored to
+  // the deepest still existing component of the old path
+  void UpdateIfDeleted();
+
+private:
+  wxConfigBase *m_pContainer;   // object we live in
+  wxString      m_strName,      // name of entry (i.e. name only)
+                m_strOldPath;   // saved path
+  bool          m_bChanged;     // was the path changed?
+
+  DECLARE_NO_COPY_CLASS(wxConfigPathChanger)
+};

 
 
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------


@@ -273,20 +338,27 @@ private:
 // ----------------------------------------------------------------------------
 
 // under Windows we prefer to use the native implementation
 // ----------------------------------------------------------------------------
 
 // under Windows we prefer to use the native implementation

-#if defined(__WXMSW__) && wxCONFIG_WIN32_NATIVE
-  #ifdef __WIN32__
+// wxIniConfig isn't native anywhere after droping win16 in wxWidgets 2.6
+#if defined(__WXMSW__) && wxUSE_CONFIG_NATIVE

     #define wxConfig  wxRegConfig
     #define wxConfig  wxRegConfig

-    #define sm_classwxConfig sm_classwxRegConfig
-  #else  //WIN16
-    #define wxConfig  wxIniConfig
-    #define sm_classwxConfig sm_classwxIniConfig
-  #endif

 #else // either we're under Unix or wish to use files even under Windows
   #define wxConfig  wxFileConfig
 #else // either we're under Unix or wish to use files even under Windows
   #define wxConfig  wxFileConfig

-  #define sm_classwxConfig sm_classwxFileConfig

 #endif
 
 #endif
 

+#endif // wxUSE_CONFIG

 
 

+/*
+  Replace environment variables ($SOMETHING) with their values. The format is
+  $VARNAME or ${VARNAME} where VARNAME contains alphanumeric characters and
+  '_' only. '$' must be escaped ('\$') in order to be taken literally.
+*/
+
+WXDLLIMPEXP_BASE wxString wxExpandEnvVars(const wxString &sz);
+
+/*
+  Split path into parts removing '..' in progress
+ */
+WXDLLIMPEXP_BASE void wxSplitPath(wxArrayString& aParts, const wxChar *sz);

 
 

-#endif  // _WX_CONFIG_H_
+#endif // _WX_CONFBASE_H_