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/***************************************************************************
*
* Copyright 2012 BMW Car IT GmbH
*
*
* 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 "ExpressionInterpreter.h"
#include "Expression.h"
#include "ilm_control.h"
#include <string>
#include <sstream>
#include <algorithm> // transform
#include <ctype.h> // tolower
#include <iostream>
Expression* ExpressionInterpreter::mpRoot = NULL;
ExpressionInterpreter::ExpressionInterpreter()
: mErrorText("No error.")
{
}
bool ExpressionInterpreter::addExpression(callback funcPtr, string command)
{
bool result = false;
string text;
stringstream ss;
ss << command;
if (!mpRoot)
{
mpRoot = new Expression("[root]", NULL);
}
Expression* currentWord = mpRoot;
while (!ss.eof())
{
ss >> text;
transform(text.begin(), text.end(), text.begin(), ::tolower);
Expression* nextWord = currentWord->getNextExpression(text);
if (!nextWord)
{
nextWord = new Expression(text, currentWord);
currentWord->addNextExpression(nextWord);
}
currentWord = nextWord;
}
currentWord->setFunc(funcPtr);
return result;
}
CommandResult ExpressionInterpreter::interpretCommand(string userInput)
{
CommandResult result = CommandSuccess;
string text;
stringstream ss;
ss << userInput;
ExpressionList currentState;
currentState.push_back(mpRoot);
ExpressionList nextState;
while (result == CommandSuccess && !ss.eof())
{
ss >> text;
ExpressionList::const_iterator iter = currentState.begin();
ExpressionList::const_iterator end = currentState.end();
for (; iter != end; ++iter)
{
Expression* expr = *iter;
ExpressionList exprNextList = expr->getNextExpressionClosure(text);
nextState.splice(nextState.end(), exprNextList);
}
if (nextState.size() > 0)
{
currentState = nextState;
nextState.clear();
}
else
{
mErrorText = "'" + text + "' not recognized.";
result = CommandInvalid;
}
}
//remove impossible expressions in the final state before checking for ambiguity
nextState.clear();
ExpressionList::const_iterator iter = currentState.begin();
ExpressionList::const_iterator end = currentState.end();
for (; iter != end; ++iter)
{
Expression* expr = *iter;
if (expr->isExecutable())
{
nextState.push_back(expr);
}
else
{
ExpressionList children = expr->getNextExpressions();
bool flag = false;
ExpressionList::const_iterator iter = children.begin();
ExpressionList::const_iterator end = children.end();
for (; iter != end; ++iter)
{
if ((*iter)->getName()[0] == '[')
{
flag = true;
}
}
if (flag || children.size() == 0)
{
nextState.push_back(expr);
}
}
}
currentState = nextState;
if (currentState.size() != 1)
{
mErrorText = "'" + text + "' ambiguous or incomplete.";
result = CommandInvalid;
}
//run command if executable and non-ambiguous
if (result == CommandSuccess)
{
Expression* expr = *(currentState.begin());
ExpressionList executables = expr->getClosureExecutables(false);
if (executables.size() == 1)
{
ilmErrorTypes initResult = ilm_init();
if (ILM_SUCCESS != initResult)
{
mErrorText = ILM_ERROR_STRING(initResult);
result = CommandExecutionFailed;
}
else
{
Expression* exec = executables.front();
exec->execute();
ilm_commitChanges();
ilm_destroy();
}
}
else if (executables.size() == 0)
{
mErrorText = "command is incomplete.";
result = CommandIncomplete;
}
else
{
mErrorText = "command is ambiguous.";
result = CommandIncomplete;
}
}
return result;
}
void ExpressionInterpreter::printExpressionTree()
{
mpRoot->printTree();
}
void ExpressionInterpreter::printExpressionList()
{
mpRoot->printList();
}
string ExpressionInterpreter::getLastError()
{
string tmp = mErrorText;
mErrorText = "no error.";
return tmp;
}
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