# Java skeleton for Bison -*- autoconf -*-
-# Copyright (C) 2007 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2008 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
[])
m4_divert_push(0)dnl
-@output(b4_parser_file_name@)
+@output(b4_parser_file_name@)@
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
- [2007])
+ [2007, 2008])
b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
])[/* First part of user declarations. */
-]b4_pre_prologue
+]b4_user_pre_prologue
+b4_user_post_prologue
b4_percent_code_get([[imports]])
[/**
- * A Bison parser, automatically generated from <tt>@ofile@</tt>.
+ * A Bison parser, automatically generated from <tt>]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[</tt>.
*
* @@author LALR (1) parser skeleton written by Paolo Bonzini.
*/
-]b4_public_if([public ])b4_abstract_if([abstract ])[class ]b4_parser_class_name[
+]b4_percent_define_get3([annotations], [], [ ])dnl
+b4_public_if([public ])dnl
+b4_abstract_if([abstract ])dnl
+b4_final_if([final ])dnl
+b4_strictfp_if([strictfp ])dnl
+[class ]b4_parser_class_name[]dnl
+b4_percent_define_get3([extends], [ extends ])dnl
+b4_percent_define_get3([implements], [ implements ])[
{
]b4_identification[
-
+]b4_error_verbose_if([[
/** True if verbose error messages are enabled. */
- public boolean errorVerbose = ]b4_flag_value([error_verbose]);
+ private boolean yyErrorVerbose = true;
+
+ /**
+ * Return whether verbose error messages are enabled.
+ */
+ public final boolean getErrorVerbose() { return yyErrorVerbose; }
+
+ /**
+ * Set the verbosity of error messages.
+ * @@param verbose True to request verbose error messages.
+ */
+ public final void setErrorVerbose(boolean verbose)
+ { yyErrorVerbose = verbose; }
+]])
b4_locations_if([[
/**
public ]b4_position_type[ end;
/**
- * Create a ]b4_location_type[ denoting an empty range located at
+ * Create a <code>]b4_location_type[</code> denoting an empty range located at
* a given point.
* @@param loc The position at which the range is anchored. */
public ]b4_location_type[ (]b4_position_type[ loc) {
/**
* Create a <code>]b4_location_type[</code> from the endpoints of the range.
* @@param begin The first position included in the range.
- * @@param begin The first position beyond the range. */
+ * @@param end The first position beyond the range. */
public ]b4_location_type[ (]b4_position_type[ begin, ]b4_position_type[ end) {
this.begin = begin;
this.end = end;
]])
-[ /** Token returned by the scanner to signal the end of its input. */
- public static final int EOF = 0;]
-
-b4_token_enums(b4_tokens)
-
b4_locations_if([[
private ]b4_location_type[ yylloc (YYStack rhs, int n)
{
return new ]b4_location_type[ (rhs.locationAt (1).begin, rhs.locationAt (n).end);
else
return new ]b4_location_type[ (rhs.locationAt (0).end);
- }]])
+ }]])[
/**
* Communication interface between the scanner and the Bison-generated
* parser <tt>]b4_parser_class_name[</tt>.
*/
public interface Lexer {
+ /** Token returned by the scanner to signal the end of its input. */
+ public static final int EOF = 0;
+
+]b4_token_enums(b4_tokens)[
+
]b4_locations_if([[/**
* Method to retrieve the beginning position of the last scanned token.
* @@return the position at which the last scanned token starts. */
/**
* Entry point for the scanner. Returns the token identifier corresponding
* to the next token and prepares to return the semantic value
- * ]b4_locations_if([and beginning/ending positions ])[of the token.
+ * ]b4_locations_if([and beginning/ending positions ])[of the token.
* @@return the token identifier corresponding to the next token. */
int yylex () ]b4_maybe_throws([b4_lex_throws])[;
/**
* Entry point for error reporting. Emits an error
- * ]b4_locations_if([ referring to the given location])[in a user-defined
- * way.
+ * ]b4_locations_if([referring to the given location ])[in a user-defined way.
*
- * ]b4_locations_if([loc], [[The location of the element to which the
+ * ]b4_locations_if([[@@param loc The location of the element to which the
* error message is related]])[
- * @@param s The string for the error message. */
- void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s);]
+ * @@param msg The string for the error message. */
+ void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String msg);]
}
b4_lexer_if([[private class YYLexer implements Lexer {
/**
* Instantiates the Bison-generated parser.
*/
- public ]b4_parser_class_name (b4_parse_param_decl([b4_lex_param_decl])[) {
+ public ]b4_parser_class_name (b4_parse_param_decl([b4_lex_param_decl])[) ]b4_maybe_throws([b4_init_throws])[
+ {
+ ]b4_percent_code_get([[init]])[
this.yylexer = new YYLexer(]b4_lex_param_call[);
]b4_parse_param_cons[
}
/**
* Instantiates the Bison-generated parser.
- * @@param yylex The scanner that will supply tokens to the parser.
+ * @@param yylexer The scanner that will supply tokens to the parser.
*/
- b4_lexer_if([[protected]], [[public]]) b4_parser_class_name[ (]b4_parse_param_decl([[Lexer yylexer]])[) {
+ b4_lexer_if([[protected]], [[public]]) b4_parser_class_name[ (]b4_parse_param_decl([[Lexer yylexer]])[) ]b4_maybe_throws([b4_init_throws])[
+ {
+ ]b4_percent_code_get([[init]])[
this.yylexer = yylexer;
]b4_parse_param_cons[
}
*/
public final void setDebugLevel(int level) { yydebug = level; }
- private final int yylex () ]b4_maybe_throws([b4_lex_throws]) [{
- return yylexer.yylex ();
+ /**
+ * Print an error message via the lexer.
+ *]b4_locations_if([[ Use a <code>null</code> location.]])[
+ * @@param msg The error message.
+ */
+ public final void yyerror (String msg)
+ {
+ yylexer.yyerror (]b4_locations_if([[(]b4_location_type[)null, ]])[msg);
}
- protected final void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s) {
- yylexer.yyerror (]b4_locations_if([loc, ])[s);
+]b4_locations_if([[
+ /**
+ * Print an error message via the lexer.
+ * @@param loc The location associated with the message.
+ * @@param msg The error message.
+ */
+ public final void yyerror (]b4_location_type[ loc, String msg)
+ {
+ yylexer.yyerror (loc, msg);
}
- ]b4_locations_if([
- protected final void yyerror (String s) {
- yylexer.yyerror ((Location)null, s);
- }
- protected final void yyerror (]b4_position_type[ loc, String s) {
- yylexer.yyerror (new ]b4_location_type[ (loc), s);
- }])
+ /**
+ * Print an error message via the lexer.
+ * @@param pos The position associated with the message.
+ * @@param msg The error message.
+ */
+ public final void yyerror (]b4_position_type[ pos, String msg)
+ {
+ yylexer.yyerror (new ]b4_location_type[ (pos), msg);
+ }]])
[protected final void yycdebug (String s) {
if (yydebug > 0)
public int size = 16;
public int height = -1;
-
+
public final void push (int state, ]b4_yystype[ value]dnl
- b4_locations_if([, ]b4_location_type[ loc])[) {
+ b4_locations_if([, ]b4_location_type[ loc])[) {
height++;
- if (size == height)
+ if (size == height)
{
int[] newStateStack = new int[size * 2];
System.arraycopy (stateStack, 0, newStateStack, 0, height);
]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2];
System.arraycopy (locStack, 0, newLocStack, 0, height);
locStack = newLocStack;]])
-
+
b4_yystype[[] newValueStack = new ]b4_yystype[[size * 2];
System.arraycopy (valueStack, 0, newValueStack, 0, height);
valueStack = newValueStack;
public void print (java.io.PrintStream out)
{
out.print ("Stack now");
-
+
for (int i = 0; i < height; i++)
{
out.print (' ');
return yyerrstatus_ == 0;
}
- private int yyaction (int yyn, YYStack yystack, int yylen)
+ private int yyaction (int yyn, YYStack yystack, int yylen) ]b4_maybe_throws([b4_throws])[
{
]b4_yystype[ yyval;
]b4_locations_if([b4_location_type[ yyloc = yylloc (yystack, yylen);]])[
/* If YYLEN is nonzero, implement the default value of the action:
`$$ = $1'. Otherwise, use the top of the stack.
-
+
Otherwise, the following line sets YYVAL to garbage.
This behavior is undocumented and Bison
users should not rely upon it. */
yyval = yystack.valueAt (yylen - 1);
else
yyval = yystack.valueAt (0);
-
+
yy_reduce_print (yyn, yystack);
switch (yyn)
return YYNEWSTATE;
}
+]b4_error_verbose_if([[
/* Return YYSTR after stripping away unnecessary quotes and
backslashes, so that it's suitable for yyerror. The heuristic is
that double-quoting is unnecessary unless the string contains an
return yystr;
}
+]])[
/*--------------------------------.
| Print this symbol on YYOUTPUT. |
yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ")
+ yytname_[yytype] + " ("]b4_locations_if([
+ yylocationp + ": "])[
- + (yyvaluep == null ? "(null)" : yyvaluep) + ")");
+ + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
}
/**
* @@return <tt>true</tt> if the parsing succeeds. Note that this does not
* imply that there were no syntax errors.
*/
- public boolean parse () ]b4_maybe_throws([b4_throws])[
+ public boolean parse () ]b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])[
{
/// Lookahead and lookahead in internal form.
int yychar = yyempty_;
yycdebug ("Entering state " + yystate + "\n");
if (yydebug > 0)
yystack.print (yyDebugStream);
-
+
/* Accept? */
if (yystate == yyfinal_)
return true;
-
+
/* Take a decision. First try without lookahead. */
yyn = yypact_[yystate];
if (yyn == yypact_ninf_)
label = YYDEFAULT;
break;
}
-
+
/* Read a lookahead token. */
if (yychar == yyempty_)
{
- yycdebug ("Reading a token: ");
- yychar = yylex ();]
+ yycdebug ("Reading a token: ");
+ yychar = yylexer.yylex ();]
b4_locations_if([[
- yylloc = new ]b4_location_type[(yylexer.getStartPos (),
- yylexer.getEndPos ());]])
+ yylloc = new ]b4_location_type[(yylexer.getStartPos (),
+ yylexer.getEndPos ());]])
yylval = yylexer.getLVal ();[
}
-
+
/* Convert token to internal form. */
- if (yychar <= EOF)
+ if (yychar <= Lexer.EOF)
{
- yychar = yytoken = EOF;
- yycdebug ("Now at end of input.\n");
+ yychar = yytoken = Lexer.EOF;
+ yycdebug ("Now at end of input.\n");
}
else
{
yytoken = yytranslate_ (yychar);
yy_symbol_print ("Next token is", yytoken,
- yylval]b4_locations_if([, yylloc])[);
+ yylval]b4_locations_if([, yylloc])[);
}
-
+
/* If the proper action on seeing token YYTOKEN is to reduce or to
detect an error, take that action. */
yyn += yytoken;
if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
label = YYDEFAULT;
-
+
/* <= 0 means reduce or error. */
else if ((yyn = yytable_[yyn]) <= 0)
{
label = YYREDUCE;
}
}
-
+
else
{
/* Shift the lookahead token. */
yy_symbol_print ("Shifting", yytoken,
- yylval]b4_locations_if([, yylloc])[);
-
+ yylval]b4_locations_if([, yylloc])[);
+
/* Discard the token being shifted. */
yychar = yyempty_;
-
+
/* Count tokens shifted since error; after three, turn off error
status. */
if (yyerrstatus_ > 0)
--yyerrstatus_;
-
+
yystate = yyn;
yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
label = YYNEWSTATE;
}
break;
-
+
/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state. |
`-----------------------------------------------------------*/
else
label = YYREDUCE;
break;
-
+
/*-----------------------------.
| yyreduce -- Do a reduction. |
`-----------------------------*/
label = yyaction (yyn, yystack, yylen);
yystate = yystack.stateAt (0);
break;
-
+
/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
++yynerrs_;
yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
}
-
+
]b4_locations_if([yyerrloc = yylloc;])[
if (yyerrstatus_ == 3)
{
- /* If just tried and failed to reuse lookahead token after an
- error, discard it. */
-
- if (yychar <= EOF)
- {
- /* Return failure if at end of input. */
- if (yychar == EOF)
- return false;
- }
- else
+ /* If just tried and failed to reuse lookahead token after an
+ error, discard it. */
+
+ if (yychar <= Lexer.EOF)
+ {
+ /* Return failure if at end of input. */
+ if (yychar == Lexer.EOF)
+ return false;
+ }
+ else
yychar = yyempty_;
}
-
+
/* Else will try to reuse lookahead token after shifting the error
token. */
label = YYERRLAB1;
break;
-
+
/*---------------------------------------------------.
| errorlab -- error raised explicitly by YYERROR. |
`---------------------------------------------------*/
case YYERROR:
-
+
]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[
/* Do not reclaim the symbols of the rule which action triggered
this YYERROR. */
yystate = yystack.stateAt (0);
label = YYERRLAB1;
break;
-
+
/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR. |
`-------------------------------------------------------------*/
case YYERRLAB1:
yyerrstatus_ = 3; /* Each real token shifted decrements this. */
-
+
for (;;)
{
yyn = yypact_[yystate];
break;
}
}
-
+
/* Pop the current state because it cannot handle the error token. */
if (yystack.height == 1)
return false;
-
+
]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
yystack.pop ();
yystate = yystack.stateAt (0);
if (yydebug > 0)
yystack.print (yyDebugStream);
}
-
+
]b4_locations_if([
/* Muck with the stack to setup for yylloc. */
yystack.push (0, null, yylloc);
/* Shift the error token. */
yy_symbol_print ("Shifting", yystos_[yyn],
yylval]b4_locations_if([, yyloc])[);
-
+
yystate = yyn;
yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
label = YYNEWSTATE;
break;
-
+
/* Accept. */
case YYACCEPT:
return true;
-
+
/* Abort. */
case YYABORT:
return false;
// Generate an error message.
private String yysyntax_error (int yystate, int tok)
- {
- if (errorVerbose)
+ {]b4_error_verbose_if([[
+ if (yyErrorVerbose)
{
int yyn = yypact_[yystate];
if (yypact_ninf_ < yyn && yyn <= yylast_)
res.append (yytnamerr_ (yytname_[x]));
}
}
- return res.toString ();
+ return res.toString ();
}
}
-
+]])[
return "syntax error";
}
-
/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
STATE-NUM. */
private static final ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
- private static final ]b4_int_type_for([b4_pact])[ yypact_[] =
- {
- ]b4_pact[
- };
+ ]b4_integral_parser_table([yypact_], [b4_pact])[
/* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
doesn't specify something else to do. Zero means the default is an
error. */
- private static final ]b4_int_type_for([b4_defact])[ yydefact_[] =
- {
- ]b4_defact[
- };
+ ]b4_integral_parser_table([yydefact_], [b4_defact])[
/* YYPGOTO[NTERM-NUM]. */
- private static final ]b4_int_type_for([b4_pgoto])[ yypgoto_[] =
- {
- ]b4_pgoto[
- };
+ ]b4_integral_parser_table([yypgoto_], [b4_pgoto])[
/* YYDEFGOTO[NTERM-NUM]. */
- private static final ]b4_int_type_for([b4_defgoto])[
- yydefgoto_[] =
- {
- ]b4_defgoto[
- };
+ ]b4_integral_parser_table([yydefgoto_], [b4_defgoto])[
/* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If
positive, shift that token. If negative, reduce the rule which
number is the opposite. If zero, do what YYDEFACT says. */
private static final ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
- private static final ]b4_int_type_for([b4_table])[
- yytable_[] =
- {
- ]b4_table[
- };
+ ]b4_integral_parser_table([yytable_], [b4_table])[
/* YYCHECK. */
- private static final ]b4_int_type_for([b4_check])[
- yycheck_[] =
- {
- ]b4_check[
- };
+ ]b4_integral_parser_table([yycheck_], [b4_check])[
/* STOS_[STATE-NUM] -- The (internal number of the) accessing
symbol of state STATE-NUM. */
- private static final ]b4_int_type_for([b4_stos])[
- yystos_[] =
- {
- ]b4_stos[
- };
+ ]b4_integral_parser_table([yystos_], [b4_stos])[
/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
to YYLEX-NUM. */
- private static final ]b4_int_type_for([b4_toknum])[
- yytoken_number_[] =
- {
- ]b4_toknum[
- };
+ ]b4_integral_parser_table([yytoken_number_], [b4_toknum])[
/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */
- private static final ]b4_int_type_for([b4_r1])[
- yyr1_[] =
- {
- ]b4_r1[
- };
+ ]b4_integral_parser_table([yyr1_], [b4_r1])[
/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */
- private static final ]b4_int_type_for([b4_r2])[
- yyr2_[] =
- {
- ]b4_r2[
- };
+ ]b4_integral_parser_table([yyr2_], [b4_r2])[
/* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
First, the terminals, then, starting at \a yyntokens_, nonterminals. */
- private static final String yytname_[] =
- {
- ]b4_tname[
- };
+ ]b4_typed_parser_table([String], [yytname_], [b4_tname])[
/* YYRHS -- A `-1'-separated list of the rules' RHS. */
- private static final ]b4_int_type_for([b4_rhs])[ yyrhs_[] =
- {
- ]b4_rhs[
- };
+ ]b4_integral_parser_table([yyrhs_], [b4_rhs])[
/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
YYRHS. */
- private static final ]b4_int_type_for([b4_prhs])[ yyprhs_[] =
- {
- ]b4_prhs[
- };
+ ]b4_integral_parser_table([yyprhs_], [b4_prhs])[
/* YYRLINE[YYN] -- Source line where rule number YYN was defined. */
- private static final ]b4_int_type_for([b4_rline])[ yyrline_[] =
- {
- ]b4_rline[
- };
+ ]b4_integral_parser_table([yyrline_], [b4_rline])[
// Report on the debug stream that the rule yyrule is going to be reduced.
private void yy_reduce_print (int yyrule, YYStack yystack)
for (int yyi = 0; yyi < yynrhs; yyi++)
yy_symbol_print (" $" + (yyi + 1) + " =",
yyrhs_[yyprhs_[yyrule] + yyi],
- ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
+ ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
b4_rhs_location(yynrhs, yyi + 1)])[);
}
/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */
- private static final ]b4_int_type_for([b4_translate])[ yytranslate_table_[] =
- {
- ]b4_translate[
- };
+ ]b4_integral_parser_table([yytranslate_table_], [b4_translate])[
private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t)
{
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