#include "global.h"

#include <string>

// derived from https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl01.html

// any non tokens get to be returned as ascii val from 0 to -255
enum token {
	eof,      // End of File
	external, // C stuff
	variable, // Name of a variable
	tree,     // tree{tree, tree{tree{tree, tree}, tree, tree{tree}}}
	integer,  // integer ._.
	string,   // string O_O
};

std::string identifierStr; // filled if string
long numVal;               // filled if integer

int getTok() {
	int lastChar = ' ';

	// skip le whitespace
	while( isspace(lastChar) )
		lastChar = getchar();
	
	if( isalpha(lastChar) ) { // identifier: [a-zA-Z][a-zA-Z0-9]*
		identifierStr = lastChar;
		while( isalnum((lastChar = getchar())) )
			identifierStr += lastChar;

		if( identifierStr == "external" )
			return external;
		
		if( isdigit(lastChar) ) {
			std::string numStr;
			do {
				numStr += lastChar;
				lastChar = getchar();
			} while( isdigit(lastChar) );

			numVal = atol(numStr.c_str());
			return integer;
		}

		if( lastChar == '#' ) {
			do
				lastChar = getchar();
			while (lastChar != EOF && lastChar != '\n' && lastChar != '\r');

			if (lastChar != EOF)
				return getTok();
		}

		return variable;
	}
}

void compiler( char filename[] ) {
	getTok();
	
}