xml: also use "%empty" with html output

[bison.git] / data / lalr1.java

diff --git a/data/lalr1.java b/data/lalr1.java
index 79c15f1f53c96351e2d2897d38853dcfb5be365c..bd32fa757433dec1c2f83980630a28bb674e4431 100644 (file)
--- a/data/lalr1.java
+++ b/data/lalr1.java
@@ -1,6 +1,6 @@
 # Java skeleton for Bison -*- autoconf -*-
 
 # Java skeleton for Bison -*- autoconf -*-
 

-# Copyright (C) 2007-2011 Free Software Foundation, Inc.
+# Copyright (C) 2007-2013 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
 
 # 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


@@ -20,7 +20,8 @@ m4_include(b4_pkgdatadir/[java.m4])
 b4_defines_if([b4_fatal([%s: %%defines 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.
+# We do not 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_parse_trace_if([0], [0])
 
 m4_define([b4_symbol_no_destructor_assert],


@@ -30,10 +31,60 @@ m4_define([b4_symbol_no_destructor_assert],
                         [b4_symbol_action_location([$1], [destructor])])])])
 b4_symbol_foreach([b4_symbol_no_destructor_assert])
 
                         [b4_symbol_action_location([$1], [destructor])])])])
 b4_symbol_foreach([b4_symbol_no_destructor_assert])
 

-m4_divert_push(0)dnl
-@output(b4_parser_file_name@)@
+# Setup some macros for api.push-pull.
+b4_percent_define_default([[api.push-pull]], [[pull]])
+b4_percent_define_check_values([[[[api.push-pull]],
+                                 [[pull]], [[push]], [[both]]]])
+
+# Define m4 conditional macros that encode the value
+# of the api.push-pull flag.
+b4_define_flag_if([pull]) m4_define([b4_pull_flag], [[1]])
+b4_define_flag_if([push]) m4_define([b4_push_flag], [[1]])
+m4_case(b4_percent_define_get([[api.push-pull]]),
+        [pull], [m4_define([b4_push_flag], [[0]])],
+        [push], [m4_define([b4_pull_flag], [[0]])])
+
+# Define a macro to be true when api.push-pull has the value "both".
+m4_define([b4_both_if],[b4_push_if([b4_pull_if([$1],[$2])],[$2])])
+
+# Handle BISON_USE_PUSH_FOR_PULL for the test suite.  So that push parsing
+# tests function as written, do not let BISON_USE_PUSH_FOR_PULL modify the
+# behavior of Bison at all when push parsing is already requested.
+b4_define_flag_if([use_push_for_pull])
+b4_use_push_for_pull_if([
+  b4_push_if([m4_define([b4_use_push_for_pull_flag], [[0]])],
+             [m4_define([b4_push_flag], [[1]])])])
+
+# Define a macro to encapsulate the parse state variables.
+# This allows them to be defined either in parse() when doing
+# pull parsing, or as class instance variable when doing push parsing.
+m4_define([b4_define_state],[[
+    /* Lookahead and lookahead in internal form.  */
+    int yychar = yyempty_;
+    int yytoken = 0;
+
+    /* State.  */
+    int yyn = 0;
+    int yylen = 0;
+    int yystate = 0;
+    YYStack yystack = new YYStack ();
+    int label = YYNEWSTATE;
+
+    /* Error handling.  */
+    int yynerrs_ = 0;
+    ]b4_locations_if([/* The location where the error started.  */
+    b4_location_type yyerrloc = null;
+
+    /* Location. */
+    b4_location_type yylloc = new b4_location_type (null, null);])[
+
+    /* Semantic value of the lookahead.  */
+    ]b4_yystype[ yylval = null;
+]])
+
+b4_output_begin([b4_parser_file_name])

 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],

-             [2007-2011])
+             [2007-2013])

 
 b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
 ])[/* First part of user declarations.  */
 
 b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
 ])[/* First part of user declarations.  */


@@ -56,7 +107,9 @@ b4_percent_define_get3([implements], [ implements ])[
 {
   ]b4_identification[
 ]b4_error_verbose_if([[
 {
   ]b4_identification[
 ]b4_error_verbose_if([[

-  /** True if verbose error messages are enabled.  */
+  /**
+   * True if verbose error messages are enabled.
+   */

   private boolean yyErrorVerbose = true;
 
   /**
   private boolean yyErrorVerbose = true;
 
   /**


@@ -77,18 +130,24 @@ b4_locations_if([[
    * A class defining a pair of positions.  Positions, defined by the
    * <code>]b4_position_type[</code> class, denote a point in the input.
    * Locations represent a part of the input through the beginning
    * A class defining a pair of positions.  Positions, defined by the
    * <code>]b4_position_type[</code> class, denote a point in the input.
    * Locations represent a part of the input through the beginning

-   * and ending positions.  */
+   * and ending positions.
+   */

   public class ]b4_location_type[ {
   public class ]b4_location_type[ {

-    /** The first, inclusive, position in the range.  */
+    /**
+     * The first, inclusive, position in the range.
+     */

     public ]b4_position_type[ begin;
 
     public ]b4_position_type[ begin;
 

-    /** The first position beyond the range.  */
+    /**
+     * The first position beyond the range.
+     */

     public ]b4_position_type[ end;
 
     /**
      * Create a <code>]b4_location_type[</code> denoting an empty range located at
      * a given point.
     public ]b4_position_type[ end;
 
     /**
      * 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.  */
+     * @@param loc The position at which the range is anchored.
+     */

     public ]b4_location_type[ (]b4_position_type[ loc) {
       this.begin = this.end = loc;
     }
     public ]b4_location_type[ (]b4_position_type[ loc) {
       this.begin = this.end = loc;
     }


@@ -96,7 +155,8 @@ b4_locations_if([[
     /**
      * Create a <code>]b4_location_type[</code> from the endpoints of the range.
      * @@param begin The first position included in the range.
     /**
      * Create a <code>]b4_location_type[</code> from the endpoints of the range.
      * @@param begin The first position included in the range.

-     * @@param end   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;
     public ]b4_location_type[ (]b4_position_type[ begin, ]b4_position_type[ end) {
       this.begin = begin;
       this.end = end;


@@ -105,7 +165,8 @@ b4_locations_if([[
     /**
      * Print a representation of the location.  For this to be correct,
      * <code>]b4_position_type[</code> should override the <code>equals</code>
     /**
      * Print a representation of the location.  For this to be correct,
      * <code>]b4_position_type[</code> should override the <code>equals</code>

-     * method.  */
+     * method.
+     */

     public String toString () {
       if (begin.equals (end))
         return begin.toString ();
     public String toString () {
       if (begin.equals (end))
         return begin.toString ();


@@ -133,28 +194,32 @@ b4_locations_if([[
     /** Token returned by the scanner to signal the end of its input.  */
     public static final int EOF = 0;
 
     /** Token returned by the scanner to signal the end of its input.  */
     public static final int EOF = 0;
 

-]b4_token_enums(b4_tokens)[
+]b4_token_enums[

 
     ]b4_locations_if([[/**
      * Method to retrieve the beginning position of the last scanned token.
 
     ]b4_locations_if([[/**
      * Method to retrieve the beginning position of the last scanned token.

-     * @@return the position at which the last scanned token starts.  */
+     * @@return the position at which the last scanned token starts.
+     */

     ]b4_position_type[ getStartPos ();
 
     /**
      * Method to retrieve the ending position of the last scanned token.
     ]b4_position_type[ getStartPos ();
 
     /**
      * Method to retrieve the ending position of the last scanned token.

-     * @@return the first position beyond the last scanned token.  */
+     * @@return the first position beyond the last scanned token.
+     */

     ]b4_position_type[ getEndPos ();]])[
 
     /**
      * Method to retrieve the semantic value of the last scanned token.
     ]b4_position_type[ getEndPos ();]])[
 
     /**
      * Method to retrieve the semantic value of the last scanned token.

-     * @@return the semantic value of the last scanned token.  */
+     * @@return the semantic value of the last scanned token.
+     */

     ]b4_yystype[ getLVal ();
 
     /**
      * 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_yystype[ getLVal ();
 
     /**
      * 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.

-     * @@return the token identifier corresponding to the next token. */
+     * @@return the token identifier corresponding to the next token.
+     */

     int yylex () ]b4_maybe_throws([b4_lex_throws])[;
 
     /**
     int yylex () ]b4_maybe_throws([b4_lex_throws])[;
 
     /**


@@ -163,7 +228,8 @@ b4_locations_if([[
      *
      * ]b4_locations_if([[@@param loc The location of the element to which the
      *                error message is related]])[
      *
      * ]b4_locations_if([[@@param loc The location of the element to which the
      *                error message is related]])[

-     * @@param msg The string for the error message.  */
+     * @@param msg The string for the error message.
+     */

      void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String msg);]
   }
 
      void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String msg);]
   }
 


@@ -171,7 +237,9 @@ b4_locations_if([[
 ]b4_percent_code_get([[lexer]])[
   }
 
 ]b4_percent_code_get([[lexer]])[
   }
 

-  ]])[/** The object doing lexical analysis for us.  */
+  ]])[/**
+   * The object doing lexical analysis for us.
+   */

   private Lexer yylexer;
   ]
   b4_parse_param_vars
   private Lexer yylexer;
   ]
   b4_parse_param_vars


@@ -326,7 +394,7 @@ b4_lexer_if([[
     {
       out.print ("Stack now");
 
     {
       out.print ("Stack now");
 

-      for (int i = 0; i < height; i++)
+      for (int i = 0; i <= height; i++)

         {
           out.print (' ');
           out.print (stateStack[i]);
         {
           out.print (' ');
           out.print (stateStack[i]);


@@ -337,46 +405,74 @@ b4_lexer_if([[
 
   /**
    * Returned by a Bison action in order to stop the parsing process and
 
   /**
    * Returned by a Bison action in order to stop the parsing process and

-   * return success (<tt>true</tt>).  */
+   * return success (<tt>true</tt>).
+   */

   public static final int YYACCEPT = 0;
 
   /**
    * Returned by a Bison action in order to stop the parsing process and
   public static final int YYACCEPT = 0;
 
   /**
    * Returned by a Bison action in order to stop the parsing process and

-   * return failure (<tt>false</tt>).  */
+   * return failure (<tt>false</tt>).
+   */

   public static final int YYABORT = 1;
 
   public static final int YYABORT = 1;
 

+]b4_push_if([
+  /**
+   * Returned by a Bison action in order to request a new token.
+   */
+  public static final int YYPUSH_MORE = 4;])[
+

   /**
    * Returned by a Bison action in order to start error recovery without
   /**
    * Returned by a Bison action in order to start error recovery without

-   * printing an error message.  */
+   * printing an error message.
+   */

   public static final int YYERROR = 2;
 
   public static final int YYERROR = 2;
 

-  // Internal return codes that are not supported for user semantic
-  // actions.
+  /**
+   * 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;
   private static final int YYERRLAB1 = 7;
   private static final int YYRETURN = 8;
   private static final int YYERRLAB = 3;
   private static final int YYNEWSTATE = 4;
   private static final int YYDEFAULT = 5;
   private static final int YYREDUCE = 6;
   private static final int YYERRLAB1 = 7;
   private static final int YYRETURN = 8;

+]b4_push_if([[  private static final int YYGETTOKEN = 9; /* Signify that a new token is expected when doing push-parsing.  */]])[

 
   private int yyerrstatus_ = 0;
 
 
   private int yyerrstatus_ = 0;
 

+]b4_push_if([dnl
+b4_define_state])[

   /**
    * Return whether error recovery is being done.  In this state, the parser
    * reads token until it reaches a known state, and then restarts normal
   /**
    * Return whether error recovery is being done.  In this state, the parser
    * reads token until it reaches a known state, and then restarts normal

-   * operation.  */
+   * operation.
+   */

   public final boolean recovering ()
   {
     return yyerrstatus_ == 0;
   }
 
   public final boolean recovering ()
   {
     return yyerrstatus_ == 0;
   }
 

+  /** Compute post-reduction state.
+   * @@param yystate   the current state
+   * @@param yysym     the nonterminal to push on the stack
+   */
+  private int yy_lr_goto_state_ (int yystate, int yysym)
+  {
+    int yyr = yypgoto_[yysym - yyntokens_] + yystate;
+    if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
+      return yytable_[yyr];
+    else
+      return yydefgoto_[yysym - yyntokens_];
+  }
+

   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:
   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:

-       `$$ = $1'.  Otherwise, use the top of the stack.
+       '$$ = $1'.  Otherwise, use the top of the stack.

 
        Otherwise, the following line sets YYVAL to garbage.
        This behavior is undocumented and Bison
 
        Otherwise, the following line sets YYVAL to garbage.
        This behavior is undocumented and Bison


@@ -400,14 +496,7 @@ b4_lexer_if([[
     yylen = 0;
 
     /* Shift the result of the reduction.  */
     yylen = 0;
 
     /* Shift the result of the reduction.  */

-    yyn = yyr1_[yyn];
-    int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
-    if (0 <= yystate && yystate <= yylast_
-        && yycheck_[yystate] == yystack.stateAt (0))
-      yystate = yytable_[yystate];
-    else
-      yystate = yydefgoto_[yyn - yyntokens_];
-
+    int yystate = yy_lr_goto_state_ (yystack.stateAt (0), yyr1_[yyn]);

     yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
     return YYNEWSTATE;
   }
     yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
     return YYNEWSTATE;
   }


@@ -464,6 +553,7 @@ b4_lexer_if([[
               + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
   }
 
               + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
   }
 

+]b4_push_if([],[[

   /**
    * Parse input from the scanner that was specified at object construction
    * time.  Return whether the end of the input was reached successfully.
   /**
    * Parse input from the scanner that was specified at object construction
    * time.  Return whether the end of the input was reached successfully.


@@ -471,50 +561,53 @@ b4_lexer_if([[
    * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
    *          imply that there were no syntax errors.
    */
    * @@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_list2([b4_lex_throws], [b4_throws])])[
+   public boolean parse () ]b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])[]])[
+]b4_push_if([
+  /**
+   * Push Parse input from external lexer
+   *
+   * @@param yylextoken current token
+   * @@param yylexval current lval
+]b4_locations_if([   * @@param yylexloc current position])[
+   *
+   * @@return <tt>YYACCEPT, YYABORT, YYPUSH_MORE</tt>
+   */
+  public int push_parse (int yylextoken, b4_yystype yylexval[]b4_locations_if([, b4_location_type yylexloc]))
+      b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])])[

   {
   {

-    /// Lookahead and lookahead in internal form.
-    int yychar = yyempty_;
-    int yytoken = 0;
-
-    /* State.  */
-    int yyn = 0;
-    int yylen = 0;
-    int yystate = 0;
-
-    YYStack yystack = new YYStack ();
-
-    /* Error handling.  */
-    int yynerrs_ = 0;
-    ]b4_locations_if([/// The location where the error started.
-    ]b4_location_type[ yyerrloc = null;
-
-    /// ]b4_location_type[ of the lookahead.
-    ]b4_location_type[ yylloc = new ]b4_location_type[ (null, null);
-
-    /// @@$.
-    ]b4_location_type[ yyloc;])
-
-    /// Semantic value of the lookahead.
-    b4_yystype[ yylval = null;
-
-    int yyresult;
-
+    ]b4_locations_if([/* @@$.  */
+    b4_location_type yyloc;])[
+]b4_push_if([],[[
+]b4_define_state[

     yycdebug ("Starting parse\n");
     yyerrstatus_ = 0;
 
     yycdebug ("Starting parse\n");
     yyerrstatus_ = 0;
 

+    /* Initialize the stack.  */
+    yystack.push (yystate, yylval ]b4_locations_if([, yylloc])[);

 ]m4_ifdef([b4_initial_action], [
 ]m4_ifdef([b4_initial_action], [

-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
+b4_dollar_pushdef([yylval], [], [yylloc])dnl

     /* User initialization code.  */
     b4_user_initial_action
     /* User initialization code.  */
     b4_user_initial_action

-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
-
-  [  /* Initialize the stack.  */
-    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
-
-    int label = YYNEWSTATE;
+b4_dollar_popdef[]dnl
+])[
+]])[
+]b4_push_if([[
+    if (!this.push_parse_initialized)
+      {
+        push_parse_initialize ();
+]m4_ifdef([b4_initial_action], [
+b4_dollar_pushdef([yylval], [], [yylloc])dnl
+    /* User initialization code.  */
+    b4_user_initial_action
+b4_dollar_popdef[]dnl
+])[
+        yycdebug ("Starting parse\n");
+        yyerrstatus_ = 0;
+      } else
+        label = YYGETTOKEN;
+
+    boolean push_token_consumed = true;
+]])[

     for (;;)
       switch (label)
       {
     for (;;)
       switch (label)
       {


@@ -527,7 +620,8 @@ m4_popdef([b4_at_dollar])])dnl
 
         /* Accept?  */
         if (yystate == yyfinal_)
 
         /* Accept?  */
         if (yystate == yyfinal_)

-          return true;
+          ]b4_push_if([{label = YYACCEPT; break;}],
+                      [return true;])[

 
         /* Take a decision.  First try without lookahead.  */
         yyn = yypact_[yystate];
 
         /* Take a decision.  First try without lookahead.  */
         yyn = yypact_[yystate];


@@ -536,16 +630,27 @@ m4_popdef([b4_at_dollar])])dnl
             label = YYDEFAULT;
             break;
           }
             label = YYDEFAULT;
             break;
           }

+]b4_push_if([        /* Fall Through */

 
 

+      case YYGETTOKEN:])[

         /* Read a lookahead token.  */
         if (yychar == yyempty_)
           {
         /* Read a lookahead token.  */
         if (yychar == yyempty_)
           {

+]b4_push_if([[
+            if (!push_token_consumed)
+              return YYPUSH_MORE;
+            yycdebug ("Reading a token: ");
+            yychar = yylextoken;
+            yylval = yylexval;]b4_locations_if([
+            yylloc = yylexloc;])[
+            push_token_consumed = false;]])[
+]b4_push_if([],[[

             yycdebug ("Reading a token: ");
             yycdebug ("Reading a token: ");

-            yychar = yylexer.yylex ();]
-            b4_locations_if([[
-            yylloc = new ]b4_location_type[(yylexer.getStartPos (),
-                            yylexer.getEndPos ());]])
-            yylval = yylexer.getLVal ();[
+            yychar = yylexer.yylex ();
+            yylval = yylexer.getLVal ();]b4_locations_if([
+            yylloc = new b4_location_type (yylexer.getStartPos (),
+                            yylexer.getEndPos ());])[
+]])[

           }
 
         /* Convert token to internal form.  */
           }
 
         /* Convert token to internal form.  */


@@ -642,10 +747,10 @@ m4_popdef([b4_at_dollar])])dnl
           {
           /* Return failure if at end of input.  */
           if (yychar == Lexer.EOF)
           {
           /* Return failure if at end of input.  */
           if (yychar == Lexer.EOF)

-            return false;
+            ]b4_push_if([{label = YYABORT; break;}],[return false;])[

           }
         else
           }
         else

-              yychar = yyempty_;
+            yychar = yyempty_;

           }
 
         /* Else will try to reuse lookahead token after shifting the error
           }
 
         /* Else will try to reuse lookahead token after shifting the error


@@ -653,9 +758,9 @@ m4_popdef([b4_at_dollar])])dnl
         label = YYERRLAB1;
         break;
 
         label = YYERRLAB1;
         break;
 

-      /*---------------------------------------------------.
+      /*-------------------------------------------------.

       | errorlab -- error raised explicitly by YYERROR.  |
       | errorlab -- error raised explicitly by YYERROR.  |

-      `---------------------------------------------------*/
+      `-------------------------------------------------*/

       case YYERROR:
 
         ]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[
       case YYERROR:
 
         ]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[


@@ -687,9 +792,10 @@ m4_popdef([b4_at_dollar])])dnl
                   }
               }
 
                   }
               }
 

-            /* Pop the current state because it cannot handle the error token.  */
-            if (yystack.height == 1)
-              return false;
+            /* Pop the current state because it cannot handle the
+             * error token.  */
+            if (yystack.height == 0)
+              ]b4_push_if([{label = YYABORT; break;}],[return false;])[

 
             ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
             yystack.pop ();
 
             ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
             yystack.pop ();


@@ -698,7 +804,11 @@ m4_popdef([b4_at_dollar])])dnl
               yystack.print (yyDebugStream);
           }
 
               yystack.print (yyDebugStream);
           }
 

-        ]b4_locations_if([
+        if (label == YYABORT)
+            /* Leave the switch.  */
+            break;
+
+]b4_locations_if([

         /* Muck with the stack to setup for yylloc.  */
         yystack.push (0, null, yylloc);
         yystack.push (0, null, yyerrloc);
         /* Muck with the stack to setup for yylloc.  */
         yystack.push (0, null, yylloc);
         yystack.push (0, null, yyerrloc);


@@ -716,13 +826,91 @@ m4_popdef([b4_at_dollar])])dnl
 
         /* Accept.  */
       case YYACCEPT:
 
         /* Accept.  */
       case YYACCEPT:

-        return true;
+        ]b4_push_if([this.push_parse_initialized = false; return YYACCEPT;],
+                    [return true;])[

 
         /* Abort.  */
       case YYABORT:
 
         /* Abort.  */
       case YYABORT:

-        return false;
+        ]b4_push_if([this.push_parse_initialized = false; return YYABORT;],
+                    [return false;])[

       }
       }

+}
+]b4_push_if([[
+  boolean push_parse_initialized = false;
+
+    /**
+     * (Re-)Initialize the state of the push parser.
+     */
+  public void push_parse_initialize()
+  {
+    /* Lookahead and lookahead in internal form.  */
+    this.yychar = yyempty_;
+    this.yytoken = 0;
+
+    /* State.  */
+    this.yyn = 0;
+    this.yylen = 0;
+    this.yystate = 0;
+    this.yystack = new YYStack ();
+    this.label = YYNEWSTATE;
+
+    /* Error handling.  */
+    this.yynerrs_ = 0;
+    ]b4_locations_if([/* The location where the error started.  */
+    this.yyerrloc = null;
+    this.yylloc = new b4_location_type (null, null);])[
+
+    /* Semantic value of the lookahead.  */
+    this.yylval = null;
+
+    yystack.push (this.yystate, this.yylval]b4_locations_if([, this.yylloc])[);
+
+    this.push_parse_initialized = true;
+
+  }
+]b4_locations_if([
+  /**
+   * Push parse given input from an external lexer.
+   *
+   * @@param yylextoken current token
+   * @@param yylexval current lval
+   * @@param yyylexpos current position
+   *
+   * @@return <tt>YYACCEPT, YYABORT, YYPUSH_MORE</tt>
+   */
+  public int push_parse (int yylextoken, b4_yystype yylexval, b4_position_type yylexpos)
+      b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])
+  {
+    return push_parse (yylextoken, yylexval, new b4_location_type (yylexpos));

   }
   }

+])[]])
+
+b4_both_if([[
+  /**
+   * Parse input from the scanner that was specified at object construction
+   * time.  Return whether the end of the input was reached successfully.
+   * This version of parse () is defined only when api.push-push=both.
+   *
+   * @@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_list2([b4_lex_throws], [b4_throws])])[
+   {
+      if (yylexer == null)
+        throw new NullPointerException("Null Lexer");
+      int status;
+      do {
+        int token = yylexer.yylex();
+        ]b4_yystype[ lval = yylexer.getLVal();
+]b4_locations_if([dnl
+        b4_location_type yyloc = new b4_location_type (yylexer.getStartPos (),
+                                              yylexer.getEndPos ());])[
+        ]b4_locations_if([status = push_parse(token,lval,yyloc);],[
+        status = push_parse(token,lval);])[
+      } while (status == YYPUSH_MORE);
+      return (status == YYACCEPT);
+  }
+]])[

 
   // Generate an error message.
   private String yysyntax_error (int yystate, int tok)
 
   // Generate an error message.
   private String yysyntax_error (int yystate, int tok)


@@ -730,11 +918,6 @@ m4_popdef([b4_at_dollar])])dnl
     if (yyErrorVerbose)
       {
         /* There are many possibilities here to consider:
     if (yyErrorVerbose)
       {
         /* There are many possibilities here to consider:

-           - Assume YYFAIL is not used.  It's too flawed to consider.
-             See
-             <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
-             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
            - 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


@@ -762,8 +945,8 @@ m4_popdef([b4_at_dollar])])dnl
         */
         if (tok != yyempty_)
           {
         */
         if (tok != yyempty_)
           {

-            // FIXME: This method of building the message is not compatible
-            // with internationalization.
+            /* FIXME: This method of building the message is not compatible
+               with internationalization.  */

             StringBuffer res =
               new StringBuffer ("syntax error, unexpected ");
             res.append (yytnamerr_ (yytname_[tok]));
             StringBuffer res =
               new StringBuffer ("syntax error, unexpected ");
             res.append (yytnamerr_ (yytname_[tok]));


@@ -812,8 +995,9 @@ m4_popdef([b4_at_dollar])])dnl
   }
 
   /**
   }
 
   /**

-   * Whether the given <code>yytable_</code> value indicates a syntax error.
-   * @@param yyvalue   the value to check
+   * Whether the given <code>yytable_</code>
+   * value indicates a syntax error.
+   * @@param yyvalue the value to check

    */
   private static boolean yy_table_value_is_error_ (int yyvalue)
   {
    */
   private static boolean yy_table_value_is_error_ (int yyvalue)
   {


@@ -825,15 +1009,16 @@ m4_popdef([b4_at_dollar])])dnl
 
   ]b4_parser_tables_define[
   ]b4_integral_parser_table_define([token_number], [b4_toknum],
 
   ]b4_parser_tables_define[
   ]b4_integral_parser_table_define([token_number], [b4_toknum],

-     [TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
-     to YYLEX-NUM.])[
+     [[YYTOKEN_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.  */
   ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
 
   ]b4_integral_parser_table_define([rline], [b4_rline],
 
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
      First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
   ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
 
   ]b4_integral_parser_table_define([rline], [b4_rline],

-  [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
+  [[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)
 
   // Report on the debug stream that the rule yyrule is going to be reduced.
   private void yy_reduce_print (int yyrule, YYStack yystack)


@@ -850,7 +1035,7 @@ m4_popdef([b4_at_dollar])])dnl
     /* The symbols being reduced.  */
     for (int yyi = 0; yyi < yynrhs; yyi++)
       yy_symbol_print ("   $" + (yyi + 1) + " =",
     /* The symbols being reduced.  */
     for (int yyi = 0; yyi < yynrhs; yyi++)
       yy_symbol_print ("   $" + (yyi + 1) + " =",

-                       yystos_[yystack.stateAt(yyi + 1 - yynrhs)],
+                       yystos_[yystack.stateAt(yynrhs - (yyi + 1))],

                        ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
                        b4_rhs_location(yynrhs, yyi + 1)])[);
   }
                        ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
                        b4_rhs_location(yynrhs, yyi + 1)])[);
   }


@@ -883,4 +1068,4 @@ b4_percent_code_get[]dnl
 }
 
 b4_epilogue[]dnl
 }
 
 b4_epilogue[]dnl

-m4_divert_pop(0)dnl
+b4_output_end()