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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file metis_CommandParser.h
* @brief Creates a dictionary of commands and parses a command-line to match against them
*
* A user creates individual CommandParserEntry that map a command-line to a function
* to execute. The CommandParser then does a longest-matching prefix match of a command-line
* to the dictionary of commands and executes the appropriate command.
*
*/
#ifndef Metis_metis_command_parser_h
#define Metis_metis_command_parser_h
#include <ccnx/transport/common/transport_MetaMessage.h>
#include <ccnx/forwarder/metis/config/metis_CommandReturn.h>
#include <ccnx/forwarder/metis/config/metis_CommandOps.h>
struct metis_command_parser;
typedef struct metis_command_parser MetisCommandParser;
/**
* metisControlState_Create
*
* Creates the global state for the MetisControl program
*
* @return non-null A command parser
*
* Example:
* @code
* <#example#>
* @endcode
*/
MetisCommandParser *metisCommandParser_Create(void);
/**
* Destroys the control state, closing all network connections
*
* <#Paragraphs Of Explanation#>
*
* @param [<#in out in,out#>] <#name#> <#description#>
*
* @return <#value#> <#explanation#>
*
* Example:
* @code
* <#example#>
* @endcode
*/
void metisCommandParser_Destroy(MetisCommandParser **statePtr);
/**
* Registers a MetisCommandOps with the system.
*
* Each command has its complete command prefix in the "command" field. RegisterCommand
* will put these command prefixes in to a tree and then match what a user types against
* the longest-matching prefix in the tree. If there's a match, it will call the "execute"
* function.
*
* When the parser is destroyed, each command's destroyer function will be called.
*
* @param [in] state An allocated MetisControlState
* @param [in] command The command to register with the system
*
* Example:
* @code
* static MetisControlReturn
* metisControl_Root_Execute(MetisCommandParser *parser, MetisCommandOps *ops, PARCList *args)
* {
* printf("Root Command\n");
* return MetisCommandReturn_Success;
* }
*
* static MetisControlReturn
* metisControl_FooBar_Execute(MetisCommandParser *parser, MetisCommandOps *ops, PARCList *args)
* {
* printf("Foo Bar Command\n");
* return MetisCommandReturn_Success;
* }
*
* const MetisCommandOps metisControl_Root = {
* .closure = NULL,
* .command = "", // empty string for root
* .init = NULL,
* .execute = metisControl_Root_Execute
* };
*
* const MetisCommandOps metisControl_FooBar = {
* .closure = NULL,
* .command = "foo bar", // empty string for root
* .init = NULL,
* .execute = metisControl_FooBar_Execute
* };
*
* void startup(void)
* {
* MetisControlState *state = metisControlState_Create("happy", "day");
* metisControlState_RegisterCommand(state, metisControl_FooBar);
* metisControlState_RegisterCommand(state, metisControl_Root);
*
* // this executes "root"
* metisControlState_DispatchCommand(state, "foo");
* metisControlState_Destroy(&state);
* }
* @endcode
*/
void metisCommandParser_RegisterCommand(MetisCommandParser *state, MetisCommandOps *command);
/**
* Performs a longest-matching prefix of the args to the command tree
*
* The command tree is created with metisControlState_RegisterCommand.
*
* @param [in] state The allocated MetisControlState
* @param [in] args Each command-line word parsed to the ordered list
*
* @return MetisCommandReturn_Success the command was successful
* @return MetisCommandReturn_Failure the command failed or was not found
* @return MetisCommandReturn_Exit the command indicates that the interactive mode should exit
*
* Example:
* @code
* <#example#>
* @endcode
*/
MetisCommandReturn metisCommandParser_DispatchCommand(MetisCommandParser *state, PARCList *args);
/**
* Sets the Debug mode, which will print out much more information.
*
* Prints out much more diagnostic information about what metis-control is doing.
* yes, you would make a MetisCommandOps to set and unset this :)
*
* @param [in] debugFlag true means to print debug info, false means to turn it off
*
* Example:
* @code
* <#example#>
* @endcode
*/
void metisCommandParser_SetDebug(MetisCommandParser *state, bool debugFlag);
/**
* Returns the debug state of MetisControlState
*
* <#Paragraphs Of Explanation#>
*
* @param [<#in out in,out#>] <#name#> <#description#>
*
* @return <#value#> <#explanation#>
*
* Example:
* @code
* <#example#>
* @endcode
*/
bool metisCommandParser_GetDebug(MetisCommandParser *state);
/**
* Checks if the command is registered
*
* Checks if the exact command given is registered. This is not a prefix match.
*
* @param [<#in out in,out#>] <#name#> <#description#>
*
* @return true The command is registered
* @return false The command is not registered
*
* Example:
* @code
* <#example#>
* @endcode
*/
bool metisCommandParser_ContainsCommand(MetisCommandParser *parser, const char *command);
#endif // Metis_metis_command_parser_h
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