// ============================================================================
// Name: Bracket-matching example of stack usage             File: brackets.cpp
// Author:  Michael and Alice Fischer                   Copyright: January 2009
// Modified February 2016
// ============================================================================
#include "brackets.hpp"
//-----------------------------------------------------------------------------
void Brackets::analyze(istream& in) {
	char ch;

	for (;;) {                  // Read and process the file.
		in.get(ch);             // This does not skip leading whitespace.
		if (!in.good())
			break;
		if (ch == '\n')
			lineno++;
		Token curtok(ch);
		if (curtok.getType() == BKT_NONE)
			continue;     // skip non-bracket characters

		switch (curtok.getSense()) {
		case SENSE_LEFT:
			stk->push(move(curtok));  // custody of curtok transferred to stk
			break;

		case SENSE_RIGHT:
			if (stk->empty())
				mismatch("Too many right brackets", curtok, false);
			toptok = stk->pop();
			if (toptok.getType() != curtok.getType())
				mismatch("Closing bracket has wrong type", curtok, false);
			break;
		}
	}
	if (!in.eof())
		throw Fatal("Failure reading input character");
	if (stk->empty())
		cout << "The brackets in this file are properly nested and matched.\n";
	else
		mismatch("Too many left brackets", toptok, true);
}

//-----------------------------------------------------------------------------
void Brackets::mismatch(const char* msg, const Token& tok, bool eofile) {
	if (eofile) {
		cout << "\nMismatch at end of file: " << msg << endl;
	} else {
		cout << "\nMismatch on line " << lineno << " : " << msg << endl;
		cout << "The current mismatching bracket is " << tok << endl;
	}
	stk->print(cout);         // print stack contents
	throw Fatal("Brackets fail to match");         // Report failure.
}