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instruction.cpp
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instruction.cpp
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/*
Author: Justin Muskopf
Instructor: Hoffman
Course: CSCE 4550, Fall 2018
Assignment: Project 1
*/
#include <algorithm>
#include <iostream>
#include <vector>
#include <sstream>
#include "instruction.h"
#include <stdexcept>
/*
Brief: Initializes an Instruction with its string value
Parameters: std::string command pulled from file
Return: N/A
*/
Instruction::Instruction(std::string command)
{
valid = false; // Only true if passes all checks
type = CMD_ERROR; // Set to ERROR_TYPE for final checks
value = 0; // Initial value of an instruction
// Copy string to this instruction var
instruction = command;
// Lower the command string
std::string lowerCmd;
lowerCmd.resize(command.size());
std::transform(command.begin(), command.end(), lowerCmd.begin(), ::tolower);
// Get first word out of command
std::string cmd = lowerCmd.substr(0, lowerCmd.find(' '));
for (int i = 0; i < Instruction::NUM_CMD_TYPES; i++)
{
if (cmd == TypeStrings[i])
{
type = static_cast<CmdType>(i);
}
}
// Type is still ERROR, invalid instruction
if (type == CMD_ERROR)
{
return;
}
// Parse instruction
parseInstruction(lowerCmd);
}
/*
Brief: Parses a file's string into an instruction object
Parameters: std::string cmd - the string that came from the file
Return: N/A
*/
void Instruction::parseInstruction(std::string cmd)
{
std::vector<std::string> words; // Holds words from the cmd string
std::string buffer; // The copy buffer for stream ops
std::stringstream stream(cmd); // Will allow easy separation by spaces
while (stream >> buffer)
{
// Add this word to words
words.push_back(buffer);
}
// Get number of words
int numWords = words.size();
// Logic based on type of instruction
switch (type)
{
case ADD_SUB:
// Bad syntax
if (numWords != 3)
{
return;
}
// Get name and lvl, error check
subName = words[1];
lvl = getLevelFromString(words[2]);
if (lvl == LVL_ERROR)
{
return;
}
break;
case ADD_OBJ:
// Bad syntax
if (numWords != 3)
{
return;
}
// Get object name and level, error check
objName = words[1];
lvl = getLevelFromString(words[2]);
if (lvl == LVL_ERROR)
{
return;
}
break;
case READ:
// Bad syntax
if (numWords != 3)
{
return;
}
// Get subject/object names
subName = words[1];
objName = words[2];
break;
case WRITE:
// Bad syntax
if (numWords != 4)
{
return;
}
// Get subject and object names
subName = words[1];
objName = words[2];
try
{
// Get value from string
value = stoi(words[3]);
}
// No number found, invalid value
catch (const std::invalid_argument& err)
{
return;
}
break;
default:
return;
};
// Valid instruction!
valid = true;
}
/*
Brief: Gets the security level from a string
Parameters: std::str - String to get lvl from
Return: The security level contained in the string, LVL_ERROR if none
*/
SecurityLevel Instruction::getLevelFromString(std::string str)
{
SecurityLevel secLvl = LVL_ERROR;
// Compare the known LevelStrings to the provided string
for (int i = 0; i < NUM_SEC_LVLS; i++)
{
// Match
if (LevelStrings[i] == str)
{
secLvl = static_cast<SecurityLevel>(i);
break;
}
}
return secLvl;
}
/*
Brief: Returns whether or not the instruction is valid
*/
bool Instruction::isValid()
{
return valid;
}
/*
Brief: Returns whether or not the instruction is invalid
*/
bool Instruction::isInvalid()
{
return !valid;
}
/*
Brief: Get the subject's name
*/
std::string Instruction::getSubjectName()
{
return subName;
}
/*
Brief: Get the object's name
*/
std::string Instruction::getObjectName()
{
return objName;
}
/*
Brief: Get the security level
*/
SecurityLevel Instruction::getSecurityLevel()
{
return lvl;
}
/*
Brief: Get the value
*/
int Instruction::getValue()
{
return value;
}
/*
Brief: Get the instruction type
*/
CmdType Instruction::getType()
{
return type;
}
/*
Brief: Get the full instruction string
*/
std::string Instruction::getInstruction()
{
return instruction;
}
// Default destructor
Instruction::~Instruction()
{
}