Added exception for parsing. Started to integrate test code.

Delta	72 lines added, 4 lines removed, 68-line increase

source/com/whitemagicsoftware/rxm/Parser.java

		package com.whitemagicsoftware.rxm;

		+import java.io.IOException;
		import java.io.StringReader;
		+
		+import java.nio.charset.Charset;
		+import java.nio.file.Files;
		+import java.nio.file.Paths;

		import java_cup.runtime.*;

		public Parser( String rxm ) throws Exception {
		Yylex lexer = new Yylex( new StringReader( rxm ) );
		-
		parser p = new parser( lexer );


		}
		catch(Throwable e) {
		- System.err.println("At line " + String.valueOf(lexer.line_num()) + ", near \"" + lexer.buff() + "\" :");
		- System.err.println(" " + e.getMessage());
		+ throw new ParserException(
		+ lexer.line_num(), lexer.buff(), e.getMessage() );
		}
		}
		-}
		+
		+ /**
		+ * @param args Contains the file name with an <b>rxm</b> to parse.
		+ */
		+ public static void main( String args[] ) throws Exception {
		+ Parser parser = new Parser( readFile( args[0] ) );
		+ }

		+ /**
		+ * Reads the entire contents of the file (specified by the given path)
		+ *
		+ */
		+ private static String readFile( String path ) throws IOException {
		+ Charset encoding = Charset.defaultCharset();
		+ byte[] encoded = Files.readAllBytes( Paths.get(path) );
		+ return new String(encoded, encoding);
		+ }
		+}

source/com/whitemagicsoftware/rxm/ParserException.java

		+package com.whitemagicsoftware.rxm;
		+
		+/**
		+ * Indicates a problem happened while parsing.
		+ */
		+public class ParserException extends RuntimeException {
		+ /** The line number in the <b>rxm</b> that could not be parsed. */
		+ private int lineNumber;
		+
		+ /** The <b>rxm</b> context wherein the parsing failed. */
		+ private String context;
		+
		+ /**
		+ * Creates a new exception that indicates a problem parsing an <b>rxm</b>
		+ * string.
		+ *
		+ * @param lineNumber The problematic line in the <b>rxm</b>.
		+ * @param context The problematic code in the <b>rxm</b>.
		+ * @param message The problem with the <b>rxm</b>.
		+ */
		+ public ParserException( int lineNumber, String context, String message ) {
		+ super( message );
		+ setLineNumber( lineNumber );
		+ setContext( context );
		+ }
		+
		+ private void setLineNumber( int lineNumber ) {
		+ this.lineNumber = lineNumber;
		+ }
		+
		+ private void setContext( String context ) {
		+ this.context = context;
		+ }
		+
		+ private int getLineNumber() {
		+ return this.lineNumber;
		+ }
		+
		+ private String getContext() {
		+ return this.context;
		+ }
		+
		+ public String toString() {
		+ return String.format( "Line: %s; near: \"%s\"; error: %s\n",
		+ getLineNumber(), getContext(), getMessage() );
		+ }
		+}
		+