Diff: Base.h

Revision:

0:a8fa94490a0a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Base.h	Sat Sep 22 10:32:07 2012 +0000
@@ -0,0 +1,225 @@
+/* mbed Microcontroller Library - Base
+ * Copyright (c) 2006-2008 ARM Limited. All rights reserved.
+ */
+ 
+#ifndef MBED_BASE_H
+#define MBED_BASE_H
+
+#include "platform.h"
+#include "PinNames.h"
+#include "PeripheralNames.h"
+#include <cstdlib>
+#include "DirHandle.h"
+
+namespace mbed {
+
+#ifdef MBED_RPC
+struct rpc_function {
+    const char *name;
+    void (*caller)(const char*, char*);
+};
+
+struct rpc_class {
+    const char *name;
+    const rpc_function *static_functions;
+    struct rpc_class *next;
+};
+#endif
+
+/* Class Base
+ *  The base class for most things
+ */
+class Base {
+
+public: 
+    
+    Base(const char *name = NULL);
+
+    virtual ~Base();
+
+    /* Function register_object
+     *  Registers this object with the given name, so that it can be
+     *  looked up with lookup. If this object has already been
+     *  registered, then this just changes the name.
+     *
+     * Variables
+     *   name - The name to give the object. If NULL we do nothing.
+     */
+    void register_object(const char *name);
+
+    /* Function name
+     *  Returns the name of the object, or NULL if it has no name.
+     */
+    const char *name();
+
+#ifdef MBED_RPC
+
+    /* Function rpc
+     *  Call the given method with the given arguments, and write the
+     *  result into the string pointed to by result. The default
+     *  implementation calls rpc_methods to determine the supported
+     *  methods.
+     *
+     * Variables
+     *  method - The name of the method to call.
+     *  arguments - A list of arguments separated by spaces.
+     *  result - A pointer to a string to write the result into. May
+     *    be NULL, in which case nothing is written.
+     *
+     *  Returns
+     *    true if method corresponds to a valid rpc method, or
+     *    false otherwise.
+     */
+    virtual bool rpc(const char *method, const char *arguments, char *result);	
+
+    /* Function get_rpc_methods
+     *  Returns a pointer to an array describing the rpc methods
+     *  supported by this object, terminated by either
+     *  RPC_METHOD_END or RPC_METHOD_SUPER(Superclass).
+     *
+     * Example
+     * > class Example : public Base {
+     * >   int foo(int a, int b) { return a + b; }
+     * >   virtual const struct rpc_method *get_rpc_methods() {
+     * >     static const rpc_method rpc_methods[] = {
+     * >       { "foo", generic_caller<int, Example, int, int, &Example::foo> },
+     * >       RPC_METHOD_SUPER(Base)
+     * >     };
+     * >     return rpc_methods;
+     * >   }
+     * > };
+     */
+    virtual const struct rpc_method *get_rpc_methods();
+
+    /* Function rpc
+     *  Use the lookup function to lookup an object and, if
+     *  successful, call its rpc method
+     *
+     * Variables
+     *  returns - false if name does not correspond to an object,
+     *    otherwise the return value of the call to the object's rpc
+     *    method.
+     */
+    static bool rpc(const char *name, const char *method, const char *arguments, char *result);
+
+#endif
+
+    /* Function lookup
+     *  Lookup and return the object that has the given name.
+     *
+     * Variables
+     *  name - the name to lookup.
+     *  len - the length of name.
+     */
+    static Base *lookup(const char *name, unsigned int len);
+
+    static DirHandle *opendir();
+    friend class BaseDirHandle;
+
+protected: 
+
+    static Base *_head;
+    Base *_next;
+    const char *_name;
+    bool _from_construct;
+
+private:
+
+#ifdef MBED_RPC
+    static rpc_class *_classes;
+
+    static const rpc_function _base_funcs[];
+    static rpc_class _base_class;
+#endif
+
+    void delete_self();
+    static void list_objs(const char *arguments, char *result);
+    static void clear(const char*,char*);
+
+    static char *new_name(Base *p);
+
+public:
+
+#ifdef MBED_RPC
+    /* Function add_rpc_class
+     *  Add the class to the list of classes which can have static
+     *  methods called via rpc (the static methods which can be called
+     *  are defined by that class' get_rpc_class() static method).
+     */
+    template<class C>
+    static void add_rpc_class() {
+        rpc_class *c = C::get_rpc_class();
+        c->next = _classes;
+        _classes = c;
+    }
+
+    template<class C> 
+    static const char *construct() {
+        Base *p = new C();
+        p->_from_construct = true;
+        if(p->_name==NULL) {
+            p->register_object(new_name(p));
+        }
+        return p->_name;
+    }
+
+    template<class C, typename A1> 
+    static const char *construct(A1 arg1) {
+        Base *p = new C(arg1);
+        p->_from_construct = true;
+        if(p->_name==NULL) {
+            p->register_object(new_name(p));
+        }
+        return p->_name;
+    }
+
+    template<class C, typename A1, typename A2> 
+    static const char *construct(A1 arg1, A2 arg2) {
+        Base *p = new C(arg1,arg2);
+        p->_from_construct = true;
+        if(p->_name==NULL) {
+            p->register_object(new_name(p));
+        }
+        return p->_name;
+    }
+
+    template<class C, typename A1, typename A2, typename A3> 
+    static const char *construct(A1 arg1, A2 arg2, A3 arg3) {
+        Base *p = new C(arg1,arg2,arg3);
+        p->_from_construct = true;
+        if(p->_name==NULL) {
+            p->register_object(new_name(p));
+        }
+        return p->_name;
+    }
+
+    template<class C, typename A1, typename A2, typename A3, typename A4> 
+    static const char *construct(A1 arg1, A2 arg2, A3 arg3, A4 arg4) {
+        Base *p = new C(arg1,arg2,arg3,arg4);
+        p->_from_construct = true;
+        if(p->_name==NULL) {
+            p->register_object(new_name(p));
+        }
+        return p->_name;
+    }
+#endif
+
+};
+
+/* Macro MBED_OBJECT_NAME_MAX
+ *  The maximum size of object name (including terminating null byte)
+ *  that will be recognised when using fopen to open a FileLike
+ *  object, or when using the rpc function.
+ */ 
+#define MBED_OBJECT_NAME_MAX 32
+
+/* Macro MBED_METHOD_NAME_MAX
+ *  The maximum size of rpc method name (including terminating null
+ *  byte) that will be recognised by the rpc function (in rpc.h).
+ */ 
+#define MBED_METHOD_NAME_MAX 32
+
+} // namespace mbed
+
+#endif
+