import java.io.*;
/**
* Simple Parser driver.
*/
public class ParseTest {
	/** 
	* Test harness for the Parser class.pathname to parse.  Command switches
	* must precede the filepath.
	* <dl>
	* <dt>-methods, -nomethods</dt>
	* <dd>enable/disable tracing of method entry/exit</dd>
	* <dt>-symbols, -nosymbols</dt>
	* <dd>enable/disable tracing of Symbols as they are defined</dd>
	* <dt>filepath</dt>
	* <dd>pathname of the file to parse.  If not specified, 
	* then the program tries to parse "fm/hello.fm".</dd>
	* </dl>
	* @param arg  the String array of command switches and arguments
	* @throws IOException thrown if any IO errors occur during processing
	*/
	public static void main(String[] arg) throws IOException {
		boolean methods = true;
		boolean symbols = false;
		String in = "fm/tA.fm";
		int argN = 0;
		// check for -switches
		while (argN < arg.length) {
			if (arg[argN].charAt(0) != '-') break;
			String tag = arg[argN];
			if (tag.equals("-methods")) methods=true;
			else if (tag.equals("-nomethods")) methods=false;
			else if (tag.equals("-symbols")) symbols = true;
			else if (tag.equals("-nosymbols")) symbols = false;
			else System.out.println("unrecognized switch: "+tag);
			argN++;
		}
		// check for file pathname
		if (argN < arg.length) {
			in = arg[argN];
		}
		CompilerIO io = new CompilerIO(in,"txt");
		io.setEchoing(true);
		io.setEchoPrefix("% ");
		SymbolTable sym = new SymbolTable(2);
		Scanner lex = new Scanner(io,sym);
		Parser p = new Parser(io,sym,lex);
		p.setShowMethods(methods);
		p.setShowSymbols(symbols);
		if (p.parse()) {
			System.out.println("Parsed "+in+" successfully.");
		} else {
			System.out.println("Parse errors in "+in);
		}
		io.closeAll();
	}
}