X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ddf17a6e0e6b5999a9f59128121347856dbe2e1b..aa3bcdf35e6e0daab858e528cfd84042a962bb0c:/data/lalr1.java
diff --git a/data/lalr1.java b/data/lalr1.java
index df87d7ba..309fc956 100644
--- a/data/lalr1.java
+++ b/data/lalr1.java
@@ -1,6 +1,6 @@
# Java skeleton for Bison -*- autoconf -*-
-# Copyright (C) 2007 Free Software Foundation, Inc.
+# Copyright (C) 2007-2011 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
@@ -17,31 +17,60 @@
m4_include(b4_pkgdatadir/[java.m4])
-b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java], [b4_skeleton])])
-m4_ifval(m4_defn([b4_symbol_destructors]),
- [b4_fatal([%s: %%destructor does not make sense in Java], [b4_skeleton])],
- [])
+b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java],
+ [b4_skeleton])])
+
+# We don't depend on %debug in Java, but pacify warnings about non-used flags.
+b4_parse_trace_if([0], [0])
+
+m4_define([b4_symbol_no_destructor_assert],
+[b4_symbol_if([$1], [has_destructor],
+ [b4_fatal([%s: %s: %%destructor does not make sense in Java],
+ [b4_skeleton],
+ [b4_symbol_action_location([$1], [destructor])])])])
+b4_symbol_foreach([b4_symbol_no_destructor_assert])
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])
+ [2007-2011])
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 @ofile@.
+ * A Bison parser, automatically generated from ]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[.
*
* @@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([[
/**
@@ -57,7 +86,7 @@ b4_locations_if([[
public ]b4_position_type[ end;
/**
- * Create a ]b4_location_type[ denoting an empty range located at
+ * Create a ]b4_location_type[ 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) {
@@ -67,7 +96,7 @@ b4_locations_if([[
/**
* Create a ]b4_location_type[ 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;
@@ -87,25 +116,25 @@ b4_locations_if([[
]])
-[ /** 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)
{
if (n > 0)
- return new ]b4_location_type[ (rhs.locationAt (1).begin, rhs.locationAt (n).end);
+ return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
else
return new ]b4_location_type[ (rhs.locationAt (0).end);
- }]])
+ }]])[
/**
* Communication interface between the scanner and the Bison-generated
* parser ]b4_parser_class_name[.
*/
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. */
@@ -124,19 +153,18 @@ b4_token_enums(b4_tokens)
/**
* 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 {
@@ -152,7 +180,9 @@ b4_lexer_if([[
/**
* 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[
}
@@ -160,9 +190,11 @@ b4_lexer_if([[
/**
* 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[
}
@@ -196,20 +228,35 @@ b4_lexer_if([[
*/
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 null 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 ((]b4_location_type[)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)
@@ -223,26 +270,26 @@ b4_lexer_if([[
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);
- stateStack = newStateStack;
- ]b4_locations_if([[
- ]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;
-
- size *= 2;
- }
+ int[] newStateStack = new int[size * 2];
+ System.arraycopy (stateStack, 0, newStateStack, 0, height);
+ stateStack = newStateStack;
+ ]b4_locations_if([[
+ ]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;
+
+ size *= 2;
+ }
stateStack[height] = state;
]b4_locations_if([[locStack[height] = loc;]])[
@@ -256,7 +303,7 @@ b4_lexer_if([[
public final void pop (int num) {
// Avoid memory leaks... garbage collection is a white lie!
if (num > 0) {
- java.util.Arrays.fill (valueStack, height - num + 1, height, null);
+ java.util.Arrays.fill (valueStack, height - num + 1, height, null);
]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height, null);]])[
}
height -= num;
@@ -278,11 +325,11 @@ b4_lexer_if([[
public void print (java.io.PrintStream out)
{
out.print ("Stack now");
-
+
for (int i = 0; i < height; i++)
{
- out.print (' ');
- out.print (stateStack[i]);
+ out.print (' ');
+ out.print (stateStack[i]);
}
out.println ();
}
@@ -303,11 +350,9 @@ b4_lexer_if([[
* printing an error message. */
public static final int YYERROR = 2;
- /**
- * Returned by a Bison action in order to print an error message and start
- * error recovery. */
- public static final int YYFAIL = 3;
-
+ // Internal return codes that are not supported for user semantic
+ // actions.
+ private static final int YYERRLAB = 3;
private static final int YYNEWSTATE = 4;
private static final int YYDEFAULT = 5;
private static final int YYREDUCE = 6;
@@ -325,14 +370,14 @@ b4_lexer_if([[
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:
`$$ = $1'. Otherwise, use the top of the stack.
-
+
Otherwise, the following line sets YYVAL to garbage.
This behavior is undocumented and Bison
users should not rely upon it. */
@@ -340,13 +385,13 @@ b4_lexer_if([[
yyval = yystack.valueAt (yylen - 1);
else
yyval = yystack.valueAt (0);
-
+
yy_reduce_print (yyn, yystack);
switch (yyn)
{
- ]b4_user_actions[
- default: break;
+ ]b4_user_actions[
+ default: break;
}
yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);
@@ -358,7 +403,7 @@ b4_lexer_if([[
yyn = yyr1_[yyn];
int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
if (0 <= yystate && yystate <= yylast_
- && yycheck_[yystate] == yystack.stateAt (0))
+ && yycheck_[yystate] == yystack.stateAt (0))
yystate = yytable_[yystate];
else
yystate = yydefgoto_[yyn - yyntokens_];
@@ -367,6 +412,7 @@ b4_lexer_if([[
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
@@ -385,7 +431,7 @@ b4_lexer_if([[
break strip_quotes;
case '\\':
- if (yystr.charAt(++i) != '\\')
+ if (yystr.charAt(++i) != '\\')
break strip_quotes;
/* Fall through. */
default:
@@ -401,20 +447,21 @@ b4_lexer_if([[
return yystr;
}
+]])[
/*--------------------------------.
| Print this symbol on YYOUTPUT. |
`--------------------------------*/
private void yy_symbol_print (String s, int yytype,
- ]b4_yystype[ yyvaluep]dnl
- b4_locations_if([, Object yylocationp])[)
+ ]b4_yystype[ yyvaluep]dnl
+ b4_locations_if([, Object yylocationp])[)
{
if (yydebug > 0)
yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ")
- + yytname_[yytype] + " ("]b4_locations_if([
- + yylocationp + ": "])[
- + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
+ + yytname_[yytype] + " ("]b4_locations_if([
+ + yylocationp + ": "])[
+ + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
}
/**
@@ -424,7 +471,7 @@ b4_lexer_if([[
* @@return true 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_;
@@ -472,143 +519,145 @@ m4_popdef([b4_at_dollar])])dnl
switch (label)
{
/* New state. Unlike in the C/C++ skeletons, the state is already
- pushed when we come here. */
+ pushed when we come here. */
case YYNEWSTATE:
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_)
+ if (yy_pact_value_is_default_ (yyn))
{
label = YYDEFAULT;
- break;
+ 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])[);
+ yytoken = yytranslate_ (yychar);
+ yy_symbol_print ("Next token is", yytoken,
+ 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)
{
- if (yyn == 0 || yyn == yytable_ninf_)
- label = YYFAIL;
- else
- {
- yyn = -yyn;
- label = YYREDUCE;
- }
+ if (yy_table_value_is_error_ (yyn))
+ label = YYERRLAB;
+ else
+ {
+ yyn = -yyn;
+ label = YYREDUCE;
+ }
}
-
+
else
{
/* Shift the lookahead token. */
- yy_symbol_print ("Shifting", yytoken,
- yylval]b4_locations_if([, yylloc])[);
-
+ yy_symbol_print ("Shifting", yytoken,
+ 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. |
`-----------------------------------------------------------*/
case YYDEFAULT:
yyn = yydefact_[yystate];
if (yyn == 0)
- label = YYFAIL;
+ label = YYERRLAB;
else
label = YYREDUCE;
break;
-
+
/*-----------------------------.
| yyreduce -- Do a reduction. |
`-----------------------------*/
case YYREDUCE:
yylen = yyr2_[yyn];
label = yyaction (yyn, yystack, yylen);
- yystate = yystack.stateAt (0);
+ yystate = yystack.stateAt (0);
break;
-
+
/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
- case YYFAIL:
+ case YYERRLAB:
/* If not already recovering from an error, report this error. */
if (yyerrstatus_ == 0)
{
- ++yynerrs_;
- yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
+ ++yynerrs_;
+ if (yychar == yyempty_)
+ yytoken = yyempty_;
+ 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
- yychar = yyempty_;
+ /* 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. */
@@ -617,58 +666,58 @@ m4_popdef([b4_at_dollar])])dnl
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. */
-
+ yyerrstatus_ = 3; /* Each real token shifted decrements this. */
+
for (;;)
{
- yyn = yypact_[yystate];
- if (yyn != yypact_ninf_)
- {
- yyn += yyterror_;
- if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
- {
- yyn = yytable_[yyn];
- if (0 < yyn)
- 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);
+ yyn = yypact_[yystate];
+ if (!yy_pact_value_is_default_ (yyn))
+ {
+ yyn += yyterror_;
+ if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
+ {
+ yyn = yytable_[yyn];
+ if (0 < yyn)
+ 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);
- yystack.push (0, null, yyerrloc);
+
+ ]b4_locations_if([
+ /* Muck with the stack to setup for yylloc. */
+ yystack.push (0, null, yylloc);
+ yystack.push (0, null, yyerrloc);
yyloc = yylloc (yystack, 2);
- yystack.pop (2);])[
+ yystack.pop (2);])[
/* Shift the error token. */
yy_symbol_print ("Shifting", yystos_[yyn],
- yylval]b4_locations_if([, yyloc])[);
-
+ yylval]b4_locations_if([, yyloc])[);
+
yystate = yyn;
- yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
+ yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
label = YYNEWSTATE;
break;
-
+
/* Accept. */
case YYACCEPT:
return true;
-
+
/* Abort. */
case YYABORT:
return false;
@@ -677,149 +726,114 @@ m4_popdef([b4_at_dollar])])dnl
// 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_)
+ /* There are many possibilities here to consider:
+ - Assume YYFAIL is not used. It's too flawed to consider.
+ See
+
+ for details. YYERROR is fine as it does not invoke this
+ function.
+ - If this state is a consistent state with a default action,
+ then the only way this function was invoked is if the
+ default action is an error action. In that case, don't
+ check for expected tokens because there are none.
+ - The only way there can be no lookahead present (in tok) is
+ if this state is a consistent state with a default action.
+ Thus, detecting the absence of a lookahead is sufficient to
+ determine that there is no unexpected or expected token to
+ report. In that case, just report a simple "syntax error".
+ - Don't assume there isn't a lookahead just because this
+ state is a consistent state with a default action. There
+ might have been a previous inconsistent state, consistent
+ state with a non-default action, or user semantic action
+ that manipulated yychar. (However, yychar is currently out
+ of scope during semantic actions.)
+ - Of course, the expected token list depends on states to
+ have correct lookahead information, and it depends on the
+ parser not to perform extra reductions after fetching a
+ lookahead from the scanner and before detecting a syntax
+ error. Thus, state merging (from LALR or IELR) and default
+ reductions corrupt the expected token list. However, the
+ list is correct for canonical LR with one exception: it
+ will still contain any token that will not be accepted due
+ to an error action in a later state.
+ */
+ if (tok != yyempty_)
{
- StringBuffer res;
-
- /* Start YYX at -YYN if negative to avoid negative indexes in
- YYCHECK. */
- int yyxbegin = yyn < 0 ? -yyn : 0;
-
- /* Stay within bounds of both yycheck and yytname. */
- int yychecklim = yylast_ - yyn + 1;
- int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
- int count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_)
- ++count;
-
- // FIXME: This method of building the message is not compatible
- // with internationalization.
- res = new StringBuffer ("syntax error, unexpected ");
- res.append (yytnamerr_ (yytname_[tok]));
- if (count < 5)
- {
- count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_)
- {
- res.append (count++ == 0 ? ", expecting " : " or ");
- res.append (yytnamerr_ (yytname_[x]));
- }
- }
- return res.toString ();
+ // FIXME: This method of building the message is not compatible
+ // with internationalization.
+ StringBuffer res =
+ new StringBuffer ("syntax error, unexpected ");
+ res.append (yytnamerr_ (yytname_[tok]));
+ int yyn = yypact_[yystate];
+ if (!yy_pact_value_is_default_ (yyn))
+ {
+ /* Start YYX at -YYN if negative to avoid negative
+ indexes in YYCHECK. In other words, skip the first
+ -YYN actions for this state because they are default
+ actions. */
+ int yyxbegin = yyn < 0 ? -yyn : 0;
+ /* Stay within bounds of both yycheck and yytname. */
+ int yychecklim = yylast_ - yyn + 1;
+ int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
+ int count = 0;
+ for (int x = yyxbegin; x < yyxend; ++x)
+ if (yycheck_[x + yyn] == x && x != yyterror_
+ && !yy_table_value_is_error_ (yytable_[x + yyn]))
+ ++count;
+ if (count < 5)
+ {
+ count = 0;
+ for (int x = yyxbegin; x < yyxend; ++x)
+ if (yycheck_[x + yyn] == x && x != yyterror_
+ && !yy_table_value_is_error_ (yytable_[x + yyn]))
+ {
+ res.append (count++ == 0 ? ", expecting " : " or ");
+ res.append (yytnamerr_ (yytname_[x]));
+ }
+ }
+ }
+ 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[
- };
-
- /* 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[
- };
-
- /* YYPGOTO[NTERM-NUM]. */
- private static final ]b4_int_type_for([b4_pgoto])[ yypgoto_[] =
+ /**
+ * Whether the given yypact_ value indicates a defaulted state.
+ * @@param yyvalue the value to check
+ */
+ private static boolean yy_pact_value_is_default_ (int yyvalue)
{
- ]b4_pgoto[
- };
+ return yyvalue == yypact_ninf_;
+ }
- /* YYDEFGOTO[NTERM-NUM]. */
- private static final ]b4_int_type_for([b4_defgoto])[
- yydefgoto_[] =
+ /**
+ * Whether the given yytable_ value indicates a syntax error.
+ * @@param yyvalue the value to check
+ */
+ private static boolean yy_table_value_is_error_ (int yyvalue)
{
- ]b4_defgoto[
- };
+ return yyvalue == yytable_ninf_;
+ }
- /* 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_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
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[
- };
-
- /* YYCHECK. */
- private static final ]b4_int_type_for([b4_check])[
- 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[
- };
-
- /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
- to YYLEX-NUM. */
- private static final ]b4_int_type_for([b4_toknum])[
- 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[
- };
-
- /* 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_parser_tables_define[
+ ]b4_integral_parser_table_define([token_number], [b4_toknum],
+ [TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
+ to YYLEX-NUM.])[
/* 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_define([String], [tname], [b4_tname])[
- /* YYRHS -- A `-1'-separated list of the rules' RHS. */
- private static final ]b4_int_type_for([b4_rhs])[ 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[
- };
-
- /* 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_define([rline], [b4_rline],
+ [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
// Report on the debug stream that the rule yyrule is going to be reduced.
private void yy_reduce_print (int yyrule, YYStack yystack)
@@ -831,21 +845,18 @@ m4_popdef([b4_at_dollar])])dnl
int yynrhs = yyr2_[yyrule];
/* Print the symbols being reduced, and their result. */
yycdebug ("Reducing stack by rule " + (yyrule - 1)
- + " (line " + yylno + "), ");
+ + " (line " + yylno + "), ");
/* The symbols being reduced. */
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_location(yynrhs, yyi + 1)])[);
+ yystos_[yystack.stateAt(yyi + 1 - yynrhs)],
+ ]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_define([translate_table], [b4_translate])[
private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t)
{
@@ -871,5 +882,5 @@ b4_percent_code_get[]dnl
}
-b4_epilogue
+b4_epilogue[]dnl
m4_divert_pop(0)dnl