java_cup-0.11a.src.java_cup.Main Maven / Gradle / Ivy
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CUP is a system for generating LALR parsers from simple specifications. It serves the same role as
the widely used program YACC [1] and in fact offers most of the features of YACC. However, CUP is
written in Java, uses specifications including embedded Java code, and produces parsers which are
implemented in Java.
The newest version!
package java_cup;
import java.util.Enumeration;
import java.io.*;
import java_cup.runtime.*;
/** This class serves as the main driver for the JavaCup system.
* It accepts user options and coordinates overall control flow.
* The main flow of control includes the following activities:
*
* - Parse user supplied arguments and options.
*
- Open output files.
*
- Parse the specification from standard input.
*
- Check for unused terminals, non-terminals, and productions.
*
- Build the state machine, tables, etc.
*
- Output the generated code.
*
- Close output files.
*
- Print a summary if requested.
*
*
* Options to the main program include:
* - -package name
*
- specify package generated classes go in [default none]
*
- -parser name
*
- specify parser class name [default "parser"]
*
- -symbols name
*
- specify name for symbol constant class [default "sym"]
*
- -interface
*
- emit symbol constant interface, rather than class
*
- -nonterms
*
- put non terminals in symbol constant class
*
- -expect #
*
- number of conflicts expected/allowed [default 0]
*
- -compact_red
*
- compact tables by defaulting to most frequent reduce
*
- -nowarn
*
- don't warn about useless productions, etc.
*
- -nosummary
*
- don't print the usual summary of parse states, etc.
*
- -progress
*
- print messages to indicate progress of the system
*
- -time
*
- print time usage summary
*
- -dump_grammar
*
- produce a dump of the symbols and grammar
*
- -dump_states
*
- produce a dump of parse state machine
*
- -dump_tables
*
- produce a dump of the parse tables
*
- -dump
*
- produce a dump of all of the above
*
- -debug
*
- turn on debugging messages within JavaCup
*
- -nopositions
*
- don't generate the positions code
*
- -noscanner
*
- don't refer to java_cup.runtime.Scanner in the parser
* (for compatibility with old runtimes)
*
- -version
*
- print version information for JavaCUP and halt.
*
*
* @version last updated: 7/3/96
* @author Frank Flannery
*/
public class Main {
/*-----------------------------------------------------------*/
/*--- Constructor(s) ----------------------------------------*/
/*-----------------------------------------------------------*/
/** Only constructor is private, so we do not allocate any instances of this
class. */
private Main() { }
/*-------------------------*/
/* Options set by the user */
/*-------------------------*/
/** User option -- do we print progress messages. */
protected static boolean print_progress = false;
/** User option -- do we produce a dump of the state machine */
protected static boolean opt_dump_states = false;
/** User option -- do we produce a dump of the parse tables */
protected static boolean opt_dump_tables = false;
/** User option -- do we produce a dump of the grammar */
protected static boolean opt_dump_grammar = false;
/** User option -- do we show timing information as a part of the summary */
protected static boolean opt_show_timing = false;
/** User option -- do we run produce extra debugging messages */
protected static boolean opt_do_debug = false;
/** User option -- do we compact tables by making most common reduce the
default action */
protected static boolean opt_compact_red = false;
/** User option -- should we include non terminal symbol numbers in the
symbol constant class. */
protected static boolean include_non_terms = false;
/** User option -- do not print a summary. */
protected static boolean no_summary = false;
/** User option -- number of conflicts to expect */
protected static int expect_conflicts = 0;
/* frankf added this 6/18/96 */
/** User option -- should generator generate code for left/right values? */
protected static boolean lr_values = true;
/** User option -- should symbols be put in a class or an interface? [CSA]*/
protected static boolean sym_interface = false;
/** User option -- should generator suppress references to
* java_cup.runtime.Scanner for compatibility with old runtimes? */
protected static boolean suppress_scanner = false;
/*----------------------------------------------------------------------*/
/* Timing data (not all of these time intervals are mutually exclusive) */
/*----------------------------------------------------------------------*/
/** Timing data -- when did we start */
protected static long start_time = 0;
/** Timing data -- when did we end preliminaries */
protected static long prelim_end = 0;
/** Timing data -- when did we end parsing */
protected static long parse_end = 0;
/** Timing data -- when did we end checking */
protected static long check_end = 0;
/** Timing data -- when did we end dumping */
protected static long dump_end = 0;
/** Timing data -- when did we end state and table building */
protected static long build_end = 0;
/** Timing data -- when did we end nullability calculation */
protected static long nullability_end = 0;
/** Timing data -- when did we end first set calculation */
protected static long first_end = 0;
/** Timing data -- when did we end state machine construction */
protected static long machine_end = 0;
/** Timing data -- when did we end table construction */
protected static long table_end = 0;
/** Timing data -- when did we end checking for non-reduced productions */
protected static long reduce_check_end = 0;
/** Timing data -- when did we finish emitting code */
protected static long emit_end = 0;
/** Timing data -- when were we completely done */
protected static long final_time = 0;
/* Additional timing information is also collected in emit */
/*-----------------------------------------------------------*/
/*--- Main Program ------------------------------------------*/
/*-----------------------------------------------------------*/
/** The main driver for the system.
* @param argv an array of strings containing command line arguments.
*/
public static void main(String argv[])
throws internal_error, java.io.IOException, java.lang.Exception
{
boolean did_output = false;
start_time = System.currentTimeMillis();
/** clean all static members, that contain remaining stuff from earlier calls */
terminal.clear();
production.clear();
action_production.clear();
emit.clear();
non_terminal.clear();
parse_reduce_row.clear();
parse_action_row.clear();
lalr_state.clear();
/* process user options and arguments */
parse_args(argv);
/* frankf 6/18/96
hackish, yes, but works */
emit.set_lr_values(lr_values);
/* open output files */
if (print_progress) System.err.println("Opening files...");
/* use a buffered version of standard input */
input_file = new BufferedInputStream(System.in);
prelim_end = System.currentTimeMillis();
/* parse spec into internal data structures */
if (print_progress)
System.err.println("Parsing specification from standard input...");
parse_grammar_spec();
parse_end = System.currentTimeMillis();
/* don't proceed unless we are error free */
if (ErrorManager.getManager().getErrorCount() == 0)
{
/* check for unused bits */
if (print_progress) System.err.println("Checking specification...");
check_unused();
check_end = System.currentTimeMillis();
/* build the state machine and parse tables */
if (print_progress) System.err.println("Building parse tables...");
build_parser();
build_end = System.currentTimeMillis();
/* output the generated code, if # of conflicts permits */
if (ErrorManager.getManager().getErrorCount() != 0) {
// conflicts! don't emit code, don't dump tables.
opt_dump_tables = false;
} else { // everything's okay, emit parser.
if (print_progress) System.err.println("Writing parser...");
open_files();
emit_parser();
did_output = true;
}
}
/* fix up the times to make the summary easier */
emit_end = System.currentTimeMillis();
/* do requested dumps */
if (opt_dump_grammar) dump_grammar();
if (opt_dump_states) dump_machine();
if (opt_dump_tables) dump_tables();
dump_end = System.currentTimeMillis();
/* close input/output files */
if (print_progress) System.err.println("Closing files...");
close_files();
/* produce a summary if desired */
if (!no_summary) emit_summary(did_output);
/* If there were errors during the run,
* exit with non-zero status (makefile-friendliness). --CSA */
if (ErrorManager.getManager().getErrorCount() != 0)
System.exit(100);
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Print a "usage message" that described possible command line options,
* then exit.
* @param message a specific error message to preface the usage message by.
*/
protected static void usage(String message)
{
System.err.println();
System.err.println(message);
System.err.println();
System.err.println(
"Usage: " + version.program_name + " [options] [filename]\n" +
" and expects a specification file on standard input if no filename is given.\n" +
" Legal options include:\n" +
" -package name specify package generated classes go in [default none]\n" +
" -destdir name specify the destination directory, to store the generated files in\n" +
" -parser name specify parser class name [default \"parser\"]\n" +
" -typearg args specify type arguments for parser class\n" +
" -symbols name specify name for symbol constant class [default \"sym\"]\n"+
" -interface put symbols in an interface, rather than a class\n" +
" -nonterms put non terminals in symbol constant class\n" +
" -expect # number of conflicts expected/allowed [default 0]\n" +
" -compact_red compact tables by defaulting to most frequent reduce\n" +
" -nowarn don't warn about useless productions, etc.\n" +
" -nosummary don't print the usual summary of parse states, etc.\n" +
" -nopositions don't propagate the left and right token position values\n" +
" -noscanner don't refer to java_cup.runtime.Scanner\n" +
" -progress print messages to indicate progress of the system\n" +
" -time print time usage summary\n" +
" -dump_grammar produce a human readable dump of the symbols and grammar\n"+
" -dump_states produce a dump of parse state machine\n"+
" -dump_tables produce a dump of the parse tables\n"+
" -dump produce a dump of all of the above\n"+
" -version print the version information for CUP and exit\n"
);
System.exit(1);
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Parse command line options and arguments to set various user-option
* flags and variables.
* @param argv the command line arguments to be parsed.
*/
protected static void parse_args(String argv[])
{
int len = argv.length;
int i;
/* parse the options */
for (i=0; i= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-package must have a name argument");
/* record the name */
emit.package_name = argv[i];
}
else if (argv[i].equals("-destdir"))
{
/* must have an arg */
if (++i >= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-destdir must have a name argument");
/* record the name */
Main.dest_dir = new java.io.File(argv[i]);
}
else if (argv[i].equals("-parser"))
{
/* must have an arg */
if (++i >= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-parser must have a name argument");
/* record the name */
emit.parser_class_name = argv[i];
}
else if (argv[i].equals("-symbols"))
{
/* must have an arg */
if (++i >= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-symbols must have a name argument");
/* record the name */
emit.symbol_const_class_name = argv[i];
}
else if (argv[i].equals("-nonterms"))
{
include_non_terms = true;
}
else if (argv[i].equals("-expect"))
{
/* must have an arg */
if (++i >= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-expect must have a name argument");
/* record the number */
try {
expect_conflicts = Integer.parseInt(argv[i]);
} catch (NumberFormatException e) {
usage("-expect must be followed by a decimal integer");
}
}
else if (argv[i].equals("-compact_red")) opt_compact_red = true;
else if (argv[i].equals("-nosummary")) no_summary = true;
else if (argv[i].equals("-nowarn")) emit.nowarn = true;
else if (argv[i].equals("-dump_states")) opt_dump_states = true;
else if (argv[i].equals("-dump_tables")) opt_dump_tables = true;
else if (argv[i].equals("-progress")) print_progress = true;
else if (argv[i].equals("-dump_grammar")) opt_dump_grammar = true;
else if (argv[i].equals("-dump"))
opt_dump_states = opt_dump_tables = opt_dump_grammar = true;
else if (argv[i].equals("-time")) opt_show_timing = true;
else if (argv[i].equals("-debug")) opt_do_debug = true;
/* frankf 6/18/96 */
else if (argv[i].equals("-nopositions")) lr_values = false;
/* CSA 12/21/97 */
else if (argv[i].equals("-interface")) sym_interface = true;
/* CSA 23-Jul-1999 */
else if (argv[i].equals("-noscanner")) suppress_scanner = true;
/* CSA 23-Jul-1999 */
else if (argv[i].equals("-version")) {
System.out.println(version.title_str);
System.exit(1);
}
/* TUM changes; suggested by Henning Niss 20050628*/
else if (argv[i].equals("-typearg")){
if (++i >= len || argv[i].startsWith("-") ||
argv[i].endsWith(".cup"))
usage("-symbols must have a name argument");
/* record the typearg */
emit.class_type_argument = argv[i];
}
/* CSA 24-Jul-1999; suggestion by Jean Vaucher */
else if (!argv[i].startsWith("-") && i==len-1) {
/* use input from file. */
try {
System.setIn(new FileInputStream(argv[i]));
} catch (java.io.FileNotFoundException e) {
usage("Unable to open \"" + argv[i] +"\" for input");
}
}
else
{
usage("Unrecognized option \"" + argv[i] + "\"");
}
}
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/*-------*/
/* Files */
/*-------*/
/** Input file. This is a buffered version of System.in. */
protected static BufferedInputStream input_file;
/** Output file for the parser class. */
protected static PrintWriter parser_class_file;
/** Output file for the symbol constant class. */
protected static PrintWriter symbol_class_file;
/** Output directory. */
protected static File dest_dir = null;
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Open various files used by the system. */
protected static void open_files()
{
File fil;
String out_name;
/* open each of the output files */
/* parser class */
out_name = emit.parser_class_name + ".java";
fil = new File(dest_dir,out_name);
try {
parser_class_file = new PrintWriter(
new BufferedOutputStream(new FileOutputStream(fil), 4096));
} catch(Exception e) {
System.err.println("Can't open \"" + out_name + "\" for output");
System.exit(3);
}
/* symbol constants class */
out_name = emit.symbol_const_class_name + ".java";
fil = new File(dest_dir,out_name);
try {
symbol_class_file = new PrintWriter(
new BufferedOutputStream(new FileOutputStream(fil), 4096));
} catch(Exception e) {
System.err.println("Can't open \"" + out_name + "\" for output");
System.exit(4);
}
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Close various files used by the system. */
protected static void close_files() throws java.io.IOException
{
if (input_file != null) input_file.close();
if (parser_class_file != null) parser_class_file.close();
if (symbol_class_file != null) symbol_class_file.close();
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Parse the grammar specification from standard input. This produces
* sets of terminal, non-terminals, and productions which can be accessed
* via static variables of the respective classes, as well as the setting
* of various variables (mostly in the emit class) for small user supplied
* items such as the code to scan with.
*/
protected static void parse_grammar_spec() throws java.lang.Exception
{
parser parser_obj;
/* create a parser and parse with it */
ComplexSymbolFactory csf = new ComplexSymbolFactory();
parser_obj = new parser(new Lexer(csf),csf);
try {
if (opt_do_debug)
parser_obj.debug_parse();
else
parser_obj.parse();
} catch (Exception e)
{
/* something threw an exception. catch it and emit a message so we
have a line number to work with, then re-throw it */
ErrorManager.getManager().emit_error("Internal error: Unexpected exception");
throw e;
}
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Check for unused symbols. Unreduced productions get checked when
* tables are created.
*/
protected static void check_unused()
{
terminal term;
non_terminal nt;
/* check for unused terminals */
for (Enumeration t = terminal.all(); t.hasMoreElements(); )
{
term = (terminal)t.nextElement();
/* don't issue a message for EOF */
if (term == terminal.EOF) continue;
/* or error */
if (term == terminal.error) continue;
/* is this one unused */
if (term.use_count() == 0)
{
/* count it and warn if we are doing warnings */
emit.unused_term++;
if (!emit.nowarn)
{
ErrorManager.getManager().emit_warning("Terminal \"" + term.name() + "\" was declared but never used");
}
}
}
/* check for unused non terminals */
for (Enumeration n = non_terminal.all(); n.hasMoreElements(); )
{
nt = (non_terminal)n.nextElement();
/* is this one unused */
if (nt.use_count() == 0)
{
/* count and warn if we are doing warnings */
emit.unused_term++;
if (!emit.nowarn)
{
ErrorManager.getManager().emit_warning("Non terminal \"" + nt.name() + "\" was declared but never used");
}
}
}
}
/* . . . . . . . . . . . . . . . . . . . . . . . . .*/
/* . . Internal Results of Generating the Parser . .*/
/* . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Start state in the overall state machine. */
protected static lalr_state start_state;
/** Resulting parse action table. */
protected static parse_action_table action_table;
/** Resulting reduce-goto table. */
protected static parse_reduce_table reduce_table;
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Build the (internal) parser from the previously parsed specification.
* This includes:
* - Computing nullability of non-terminals.
*
- Computing first sets of non-terminals and productions.
*
- Building the viable prefix recognizer machine.
*
- Filling in the (internal) parse tables.
*
- Checking for unreduced productions.
*
*/
protected static void build_parser() throws internal_error
{
/* compute nullability of all non terminals */
if (opt_do_debug || print_progress)
System.err.println(" Computing non-terminal nullability...");
non_terminal.compute_nullability();
nullability_end = System.currentTimeMillis();
/* compute first sets of all non terminals */
if (opt_do_debug || print_progress)
System.err.println(" Computing first sets...");
non_terminal.compute_first_sets();
first_end = System.currentTimeMillis();
/* build the LR viable prefix recognition machine */
if (opt_do_debug || print_progress)
System.err.println(" Building state machine...");
start_state = lalr_state.build_machine(emit.start_production);
machine_end = System.currentTimeMillis();
/* build the LR parser action and reduce-goto tables */
if (opt_do_debug || print_progress)
System.err.println(" Filling in tables...");
action_table = new parse_action_table();
reduce_table = new parse_reduce_table();
for (Enumeration st = lalr_state.all(); st.hasMoreElements(); )
{
lalr_state lst = (lalr_state)st.nextElement();
lst.build_table_entries(
action_table, reduce_table);
}
table_end = System.currentTimeMillis();
/* check and warn for non-reduced productions */
if (opt_do_debug || print_progress)
System.err.println(" Checking for non-reduced productions...");
action_table.check_reductions();
reduce_check_end = System.currentTimeMillis();
/* if we have more conflicts than we expected issue a message and die */
if (emit.num_conflicts > expect_conflicts)
{
ErrorManager.getManager().emit_error("*** More conflicts encountered than expected " +
"-- parser generation aborted");
// indicate the problem.
// we'll die on return, after clean up.
}
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Call the emit routines necessary to write out the generated parser. */
protected static void emit_parser() throws internal_error
{
emit.symbols(symbol_class_file, include_non_terms, sym_interface);
emit.parser(parser_class_file, action_table, reduce_table,
start_state.index(), emit.start_production, opt_compact_red,
suppress_scanner);
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Helper routine to optionally return a plural or non-plural ending.
* @param val the numerical value determining plurality.
*/
protected static String plural(int val)
{
if (val == 1)
return "";
else
return "s";
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Emit a long summary message to standard error (System.err) which
* summarizes what was found in the specification, how many states were
* produced, how many conflicts were found, etc. A detailed timing
* summary is also produced if it was requested by the user.
* @param output_produced did the system get far enough to generate code.
*/
protected static void emit_summary(boolean output_produced)
{
final_time = System.currentTimeMillis();
if (no_summary) return;
System.err.println("------- " + version.title_str +
" Parser Generation Summary -------");
/* error and warning count */
System.err.println(" " + ErrorManager.getManager().getErrorCount() + " error" +
plural(ErrorManager.getManager().getErrorCount()) + " and " + ErrorManager.getManager().getWarningCount() +
" warning" + plural(ErrorManager.getManager().getWarningCount()));
/* basic stats */
System.err.print(" " + terminal.number() + " terminal" +
plural(terminal.number()) + ", ");
System.err.print(non_terminal.number() + " non-terminal" +
plural(non_terminal.number()) + ", and ");
System.err.println(production.number() + " production" +
plural(production.number()) + " declared, ");
System.err.println(" producing " + lalr_state.number() +
" unique parse states.");
/* unused symbols */
System.err.println(" " + emit.unused_term + " terminal" +
plural(emit.unused_term) + " declared but not used.");
System.err.println(" " + emit.unused_non_term + " non-terminal" +
plural(emit.unused_term) + " declared but not used.");
/* productions that didn't reduce */
System.err.println(" " + emit.not_reduced + " production" +
plural(emit.not_reduced) + " never reduced.");
/* conflicts */
System.err.println(" " + emit.num_conflicts + " conflict" +
plural(emit.num_conflicts) + " detected" +
" (" + expect_conflicts + " expected).");
/* code location */
if (output_produced)
System.err.println(" Code written to \"" + emit.parser_class_name +
".java\", and \"" + emit.symbol_const_class_name + ".java\".");
else
System.err.println(" No code produced.");
if (opt_show_timing) show_times();
System.err.println(
"---------------------------------------------------- (" +
version.version_str + ")");
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Produce the optional timing summary as part of an overall summary. */
protected static void show_times()
{
long total_time = final_time - start_time;
System.err.println(". . . . . . . . . . . . . . . . . . . . . . . . . ");
System.err.println(" Timing Summary");
System.err.println(" Total time "
+ timestr(final_time-start_time, total_time));
System.err.println(" Startup "
+ timestr(prelim_end-start_time, total_time));
System.err.println(" Parse "
+ timestr(parse_end-prelim_end, total_time) );
if (check_end != 0)
System.err.println(" Checking "
+ timestr(check_end-parse_end, total_time));
if (check_end != 0 && build_end != 0)
System.err.println(" Parser Build "
+ timestr(build_end-check_end, total_time));
if (nullability_end != 0 && check_end != 0)
System.err.println(" Nullability "
+ timestr(nullability_end-check_end, total_time));
if (first_end != 0 && nullability_end != 0)
System.err.println(" First sets "
+ timestr(first_end-nullability_end, total_time));
if (machine_end != 0 && first_end != 0)
System.err.println(" State build "
+ timestr(machine_end-first_end, total_time));
if (table_end != 0 && machine_end != 0)
System.err.println(" Table build "
+ timestr(table_end-machine_end, total_time));
if (reduce_check_end != 0 && table_end != 0)
System.err.println(" Checking "
+ timestr(reduce_check_end-table_end, total_time));
if (emit_end != 0 && build_end != 0)
System.err.println(" Code Output "
+ timestr(emit_end-build_end, total_time));
if (emit.symbols_time != 0)
System.err.println(" Symbols "
+ timestr(emit.symbols_time, total_time));
if (emit.parser_time != 0)
System.err.println(" Parser class "
+ timestr(emit.parser_time, total_time));
if (emit.action_code_time != 0)
System.err.println(" Actions "
+ timestr(emit.action_code_time, total_time));
if (emit.production_table_time != 0)
System.err.println(" Prod table "
+ timestr(emit.production_table_time, total_time));
if (emit.action_table_time != 0)
System.err.println(" Action tab "
+ timestr(emit.action_table_time, total_time));
if (emit.goto_table_time != 0)
System.err.println(" Reduce tab "
+ timestr(emit.goto_table_time, total_time));
System.err.println(" Dump Output "
+ timestr(dump_end-emit_end, total_time));
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Helper routine to format a decimal based display of seconds and
* percentage of total time given counts of milliseconds. Note: this
* is broken for use with some instances of negative time (since we don't
* use any negative time here, we let if be for now).
* @param time_val the value being formatted (in ms).
* @param total_time total time percentages are calculated against (in ms).
*/
protected static String timestr(long time_val, long total_time)
{
boolean neg;
long ms = 0;
long sec = 0;
long percent10;
String pad;
/* work with positives only */
neg = time_val < 0;
if (neg) time_val = -time_val;
/* pull out seconds and ms */
ms = time_val % 1000;
sec = time_val / 1000;
/* construct a pad to blank fill seconds out to 4 places */
if (sec < 10)
pad = " ";
else if (sec < 100)
pad = " ";
else if (sec < 1000)
pad = " ";
else
pad = "";
/* calculate 10 times the percentage of total */
percent10 = (time_val*1000)/total_time;
/* build and return the output string */
return (neg ? "-" : "") + pad + sec + "." +
((ms%1000)/100) + ((ms%100)/10) + (ms%10) + "sec" +
" (" + percent10/10 + "." + percent10%10 + "%)";
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** Produce a human readable dump of the grammar. */
public static void dump_grammar() throws internal_error
{
System.err.println("===== Terminals =====");
for (int tidx=0, cnt=0; tidx < terminal.number(); tidx++, cnt++)
{
System.err.print("["+tidx+"]"+terminal.find(tidx).name()+" ");
if ((cnt+1) % 5 == 0) System.err.println();
}
System.err.println();
System.err.println();
System.err.println("===== Non terminals =====");
for (int nidx=0, cnt=0; nidx < non_terminal.number(); nidx++, cnt++)
{
System.err.print("["+nidx+"]"+non_terminal.find(nidx).name()+" ");
if ((cnt+1) % 5 == 0) System.err.println();
}
System.err.println();
System.err.println();
System.err.println("===== Productions =====");
for (int pidx=0; pidx < production.number(); pidx++)
{
production prod = production.find(pidx);
System.err.print("["+pidx+"] "+prod.lhs().the_symbol().name() + " ::= ");
for (int i=0; i