Java Options类代码示例

import beaver.comp.run.Options; //导入依赖的package包/类
public void writeTerminalsSource(File src_file, File dir, String output_file_name, Options opts) throws IOException
{
	FileWriter out = new FileWriter(new File(dir, output_file_name + SOURCE_FILE_EXT));
	try
	{
		if (grammar.package_name != null)
		{
			out.write("package ");
			out.write(grammar.package_name);
			out.write(";\n\n");
		}
		out.write("/**\n");
		out.write(" * This class lists terminals used by the\n");
		out.write(" * grammar specified in \"");
		out.write(src_file.getName());
		out.write("\".\n");
		out.write(" */\n");
		writeTerminalsClass(grammar, opts, "", out);
	}
	finally
	{
		out.close();
	}
}
 

import beaver.comp.run.Options; //导入依赖的package包/类
/**
 * Writes a Java class that is a parser from the user point of view. Actual implementation though simply extends
 * LALR parser implementation from Page and supplies action implementations for all productions and "enum" for all
 * terminal symbols.
 *
 * @throws IOException
 *             when writing to a file fails
 */
public void writeParserSource(File src_file, File dir, String class_name, Options opts) throws IOException
{
	FileWriter out = new FileWriter(new File(dir, class_name + SOURCE_FILE_EXT));
	try
	{
		if (grammar.prolog != null)
		{
			out.write(grammar.prolog);
			out.write('\n');
		}
		if (grammar.package_name != null)
		{
			out.write("package ");
			out.write(grammar.package_name);
			out.write(";\n\n");
		}
		for (int i = 0; i < grammar.imports.length; i++)
		{
			out.write("import ");
			out.write(grammar.imports[i]);
			out.write(";\n");
		}
		out.write('\n');
		out.write("/**\n");
		out.write(" * This class is a LALR parser generated by\n");
		out.write(" * <a href=\"http://beaver.sourceforge.net\">Beaver</a> v");
		out.write(VERSION);
		out.write('\n');
		out.write(" * from the grammar specification \"");
		out.write(src_file.getName());
		out.write("\".\n");
		out.write(" */\n");
		writeClass(class_name, opts, out);
	}
	finally
	{
		out.close();
	}
}
 

import beaver.comp.run.Options; //导入依赖的package包/类
static public ParserGenerator.CompiledParser compile(Grammar grammar, Options opts, Log log) throws Grammar.Exception
{
	grammar.markNullableProductions();
	grammar.buildFirstSets();
	State first = makeStates(grammar);
	findLookaheads(first);
	buildActions(grammar, first);
	checkAndResolveConflicts(first, log);
	checkUnreducibleProductions(grammar, first, log);
	if (!opts.no_compression)
		compressActions(first);
	splitActions(first);
	return new CompiledParser(grammar, new ParsingTables(grammar, first));
}
 

import beaver.comp.run.Options; //导入依赖的package包/类
static private void writeTerminalsClass(Grammar grammar, Options opts, String indent, Writer out) throws IOException
{
	out.write(indent);
	if (indent.length() > 0)
		out.write("static ");
	out.write("public class Terminals {\n");

	Terminal[] terms;
	if (opts.sort_terminals)
	{
		terms = new Terminal[grammar.terminals.length];
		System.arraycopy(grammar.terminals, 0, terms, 0, terms.length);
		Arrays.sort(terms, TERMINAL_NAME_CMP);
	}
	else
	{
		terms = grammar.terminals;
	}

	for (int i = 0; i < terms.length; i++)
	{
              if (terms[i].name.charAt(0) == '$')
                  continue;
		out.write(indent);
		out.write("\tstatic public final short ");
		out.write(terms[i].name);
		out.write(" = ");
		out.write(String.valueOf(terms[i].id));
		out.write(";\n");
	}
	if (opts.terminal_names)
	{
		terms = grammar.terminals;
		out.write('\n');
		out.write(indent);
		out.write("\tstatic public final String[] NAMES = {\n");
		for (int i = 0; i < terms.length - 1; i++)
		{
                  if (terms[i].name.charAt(0) == '$')
                      continue;
			out.write(indent);
			out.write("\t\t\"");
			out.write(terms[i].name);
			out.write("\",\n");
		}
		if (terms.length > 0 && terms[terms.length - 1].name.charAt(0) != '$')
		{
			out.write(indent);
			out.write("\t\t\"");
			out.write(terms[terms.length - 1].name);
			out.write("\"\n");
		}
		out.write(indent);
		out.write("\t};\n");
	}
	out.write(indent);
	out.write("}\n");
}