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/*
* Copyright (c) 2017-2019 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.
*/
#include <src/config.h>
#include <parc/assert/parc_Assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <parc/security/parc_Security.h>
#include <parc/algol/parc_List.h>
#include <parc/algol/parc_Memory.h>
#include <parc/algol/parc_Time.h>
#include <parc/algol/parc_TreeRedBlack.h>
#include <src/config/commandParser.h>
#ifndef __ANDROID__
#ifdef HAVE_ERRNO_H
#include <errno.h>
#else
#ifndef _WIN32
extern int errno;
#endif
#endif
#endif
struct command_parser {
// key = command, value = CommandOps
PARCTreeRedBlack *commandTree;
bool debugFlag;
};
static int _stringCompare(const void *key1, const void *key2) {
return strcasecmp((const char *)key1, (const char *)key2);
}
CommandParser *commandParser_Create(void) {
CommandParser *state = parcMemory_AllocateAndClear(sizeof(CommandParser));
parcAssertNotNull(state, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(CommandParser));
state->commandTree = parcTreeRedBlack_Create(_stringCompare, // key compare
NULL, // key free
NULL, // key copy
NULL, // value equals
NULL, // value free
NULL // value copy
);
state->debugFlag = false;
return state;
}
void commandParser_Destroy(CommandParser **parserPtr) {
CommandParser *parser = *parserPtr;
// destroy every element if it has a destroyer
PARCArrayList *values = parcTreeRedBlack_Values(parser->commandTree);
if (values) {
for (int i = 0; i < parcArrayList_Size(values); i++) {
CommandOps *ops = parcArrayList_Get(values, i);
parcTreeRedBlack_Remove(parser->commandTree, ops->command);
if (ops->destroyer) {
ops->destroyer(&ops);
}
}
parcArrayList_Destroy(&values);
}
parcTreeRedBlack_Destroy(&parser->commandTree);
parcMemory_Deallocate((void **)&parser);
*parserPtr = NULL;
}
void commandParser_SetDebug(CommandParser *state, bool debugFlag) {
state->debugFlag = debugFlag;
}
bool commandParser_GetDebug(CommandParser *state) { return state->debugFlag; }
void commandParser_RegisterCommand(CommandParser *state, CommandOps *ops) {
parcAssertNotNull(state, "Parameter state must be non-null");
parcAssertNotNull(ops, "Parameter ops must be non-null");
parcAssertNotNull(ops->command, "Operation command string must be non-null");
void *exists = parcTreeRedBlack_Get(state->commandTree, ops->command);
parcAssertNull(exists, "Command '%s' already exists in the tree %p\n",
ops->command, (void *)exists);
parcTreeRedBlack_Insert(state->commandTree, (void *)ops->command,
(void *)ops);
// if the command being registered asked for an init function to be called,
// call it
if (ops->init != NULL) {
ops->init(state, ops);
}
}
static PARCList *parseStringIntoTokens(const char *originalString) {
PARCList *list =
parcList(parcArrayList_Create(parcArrayList_StdlibFreeFunction),
PARCArrayListAsPARCList);
char *token;
char *tofree =
parcMemory_StringDuplicate(originalString, strlen(originalString) + 1);
char *string = tofree;
token = strtok(string, " \t\n");
while (token != NULL) {
if (strlen(token) > 0) {
parcList_Add(list, strdup(token));
}
token = strtok(NULL, " \t\n");
}
parcMemory_Deallocate((void **)&tofree);
return list;
}
/**
* Matches the user arguments to available commands, returning the command or
* NULL if not found
*
* <#Paragraphs Of Explanation#>
*
* @param [<#in out in,out#>] <#name#> <#description#>
*
* @return <#value#> <#explanation#>
*
* Example:
* @code
* <#example#>
* @endcode
*/
static CommandOps *commandParser_MatchCommand(CommandParser *state,
PARCList *args) {
// Find the longest matching prefix command.
// Pretty wildly inefficient
size_t longest_token_count = 0;
char *longest_command = NULL;
PARCArrayList *commands = parcTreeRedBlack_Keys(state->commandTree);
for (int i = 0; i < parcArrayList_Size(commands); i++) {
char *command = parcArrayList_Get(commands, i);
PARCList *command_tokens = parseStringIntoTokens(command);
// is it a prefix match?
if (parcList_Size(args) >= parcList_Size(command_tokens)) {
bool possible_match = true;
for (int i = 0; i < parcList_Size(command_tokens) && possible_match;
i++) {
const char *a = parcList_GetAtIndex(command_tokens, i);
const char *b = parcList_GetAtIndex(args, i);
if (strncasecmp(a, b, strlen(a) + 1) != 0) {
possible_match = false;
}
}
if (possible_match &&
parcList_Size(command_tokens) > longest_token_count) {
longest_token_count = parcList_Size(command_tokens);
longest_command = command;
}
}
parcList_Release(&command_tokens);
}
parcArrayList_Destroy(&commands);
if (longest_token_count == 0) {
return NULL;
} else {
CommandOps *ops = parcTreeRedBlack_Get(state->commandTree, longest_command);
parcAssertNotNull(ops, "Got null operations for command '%s'\n",
longest_command);
return ops;
}
}
CommandReturn commandParser_DispatchCommand(CommandParser *state,
PARCList *args) {
CommandOps *ops = commandParser_MatchCommand(state, args);
if (ops == NULL) {
printf("Command not found.\n");
return CommandReturn_Failure;
} else {
return ops->execute(state, ops, args);
}
}
bool commandParser_ContainsCommand(CommandParser *parser, const char *command) {
CommandOps *ops = parcTreeRedBlack_Get(parser->commandTree, command);
return (ops != NULL);
}
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