Exercise 5, 6

//--------------------------------------------//
// C6 - Exercise 5,6
// I couldn't do this excercise when I first read this book. It went way over my head.
// I don't have a lot of time to spend on exercises as I did back then so this hacky attempt will have to do for the moment
// This doesn't scale well mainly due to strings not being able to switch.
//--------------------------------------------//

#include "std_lib_facilities.h"

// -----------------------------------------------------------------------------

/*
FullStop:
	" . "
	Noun Verb FullStop
	The Noun Verb FullStop
	Sentence Conjunction Sentence FullStop
Sentence:
	Noun Verb
	The Noun Verb
	Sentence Conjunction Sentence
Conjunction:
	"and"
	"or"
	"but"
The:
	"The" 
Noun:
	"birds"
	"fish"
	"C++"
Verb:
	"rules"
	"fly"
	"swim"
*/

// -----------------------------------------------------------------------------
enum wordTypes
{
	WSPACE,
	PERIOD,
	THE,
	NOUN,
	VERB,
	CONJ
};

//six types of sentences allowed in this exercise
//very hacky way of doing this, I'm not that happy with it - it doesn't scale well
vector<wordTypes> wt_sentence{ NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE};
vector<wordTypes> wt_sentence2{ THE, WSPACE, NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE };
vector<wordTypes> wt_sentence3{ NOUN, WSPACE, VERB, WSPACE, CONJ, WSPACE, NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE };
vector<wordTypes> wt_sentence4{ THE, WSPACE, NOUN, WSPACE, VERB, WSPACE, CONJ, WSPACE, NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE };
vector<wordTypes> wt_sentence5{ THE, WSPACE, NOUN, WSPACE, VERB, WSPACE, CONJ, WSPACE, THE, WSPACE, NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE };
vector<wordTypes> wt_sentence6{ NOUN, WSPACE, VERB, WSPACE, CONJ, WSPACE, THE, WSPACE, NOUN, WSPACE, VERB, WSPACE, PERIOD, WSPACE };

bool sentenceChecker(vector<string>& s)
{
	vector<wordTypes> mySentence;
	//parse vector and create a vector of wordtypes from it
	for (int i = 0; i < s.size(); ++i)
	{
		if (s[i] == "The" || s[i] == "the")
			mySentence.push_back(THE);
		else if (s[i] == "birds" || s[i] == "fish" || s[i] == "C++")
			mySentence.push_back(NOUN);
		else if (s[i] == " ")
			mySentence.push_back(WSPACE);
		else if (s[i] == "rules" || s[i] == "fly" || s[i] == "swim")
			mySentence.push_back(VERB);
		else if (s[i] == "and" || s[i] == "or" || s[i] == "but")
			mySentence.push_back(CONJ);
		else if (s[i] == ".")
			mySentence.push_back(PERIOD);
	}

	if (mySentence == wt_sentence ||
		mySentence == wt_sentence2 ||
		mySentence == wt_sentence3 ||
		mySentence == wt_sentence4 ||
		mySentence == wt_sentence5 ||
		mySentence == wt_sentence6)
		return true;
	else
		return false;
}

// -----------------------------------------------------------------------------

int main()
{
	string words, tempWord;
	vector<string> sentence;
	cout << "Please enter a sentence according to grammar rules:" << endl;
	
	//read the entire line, whitespace included
	getline(cin, words);
	//parse line into a vector
	for (int i = 0; i < words.size(); ++i)
	{
		if (words[i] != ' ')
		{
			tempWord += words[i];
		}
		else
		{
			sentence.push_back(tempWord);
			sentence.push_back(" ");
			tempWord = "";
		}
	}

	if (sentenceChecker(sentence))
		cout << "OK." << endl;
	else
		cout << "Not OK." << endl;
	
	keep_window_open();
	return 0;
}

//------------------------------------------------------------------------------