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+/*
+ * Copyright 1993, 2000 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*  This file is ALSO:
+ *  Copyright 2001-2004 David Abrahams.
+ *  Distributed under the Boost Software License, Version 1.0.
+ *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+/*
+ * jamgram.yy - jam grammar
+ *
+ * 04/13/94 (seiwald) - added shorthand L0 for null list pointer
+ * 06/01/94 (seiwald) - new 'actions existing' does existing sources
+ * 08/23/94 (seiwald) - Support for '+=' (append to variable)
+ * 08/31/94 (seiwald) - Allow ?= as alias for "default =".
+ * 09/15/94 (seiwald) - if conditionals take only single arguments, so
+ *			that 'if foo == bar' gives syntax error (use =).
+ * 02/11/95 (seiwald) - when scanning arguments to rules, only treat
+ *			punctuation keywords as keywords.  All arg lists
+ *			are terminated with punctuation keywords.
+ *
+ * 09/11/00 (seiwald) - Support for function calls:
+ *
+ *		Rules now return lists (LIST *), rather than void.
+ *
+ *		New "[ rule ]" syntax evals rule into a LIST.
+ *
+ *		Lists are now generated by compile_list() and
+ *		compile_append(), and any other rule that indirectly
+ *		makes a list, rather than being built directly here,
+ *		so that lists values can contain rule evaluations.
+ *
+ *		New 'return' rule sets the return value, though
+ *		other statements also may have return values.
+ *
+ *		'run' production split from 'block' production so
+ *		that empty blocks can be handled separately.
+ */
+
+%token ARG STRING
+
+%left `||` `|`
+%left `&&` `&`
+%left `=` `!=` `in`
+%left `<` `<=` `>` `>=`
+%left `!`
+
+%{
+#include "jam.h"
+
+#include "lists.h"
+#include "parse.h"
+#include "scan.h"
+#include "compile.h"
+#include "newstr.h"
+#include "rules.h"
+
+# define YYMAXDEPTH 10000	/* for OSF and other less endowed yaccs */
+
+# define F0 (LIST *(*)(PARSE *, FRAME *))0
+# define P0 (PARSE *)0
+# define S0 (char *)0
+
+# define pappend( l,r )    	parse_make( compile_append,l,r,P0,S0,S0,0 )
+# define peval( c,l,r )	parse_make( compile_eval,l,r,P0,S0,S0,c )
+# define pfor( s,l,r,x )    	parse_make( compile_foreach,l,r,P0,s,S0,x )
+# define pif( l,r,t )	  	parse_make( compile_if,l,r,t,S0,S0,0 )
+# define pincl( l )       	parse_make( compile_include,l,P0,P0,S0,S0,0 )
+# define plist( s )	  	parse_make( compile_list,P0,P0,P0,s,S0,0 )
+# define plocal( l,r,t )  	parse_make( compile_local,l,r,t,S0,S0,0 )
+# define pmodule( l,r )	  	parse_make( compile_module,l,r,P0,S0,S0,0 )
+# define pclass( l,r )	  	parse_make( compile_class,l,r,P0,S0,S0,0 )
+# define pnull()	  	parse_make( compile_null,P0,P0,P0,S0,S0,0 )
+# define pon( l,r )	  	parse_make( compile_on,l,r,P0,S0,S0,0 )
+# define prule( s,p )     	parse_make( compile_rule,p,P0,P0,s,S0,0 )
+# define prules( l,r )	  	parse_make( compile_rules,l,r,P0,S0,S0,0 )
+# define pset( l,r,a )          parse_make( compile_set,l,r,P0,S0,S0,a )
+# define pset1( l,r,t,a )	parse_make( compile_settings,l,r,t,S0,S0,a )
+# define psetc( s,p,a,l )     	parse_make( compile_setcomp,p,a,P0,s,S0,l )
+# define psete( s,l,s1,f ) 	parse_make( compile_setexec,l,P0,P0,s,s1,f )
+# define pswitch( l,r )   	parse_make( compile_switch,l,r,P0,S0,S0,0 )
+# define pwhile( l,r )   	parse_make( compile_while,l,r,P0,S0,S0,0 )
+
+# define pnode( l,r )    	parse_make( F0,l,r,P0,S0,S0,0 )
+# define psnode( s,l )     	parse_make( F0,l,P0,P0,s,S0,0 )
+
+%}
+
+%%
+
+run	: /* empty */
+		/* do nothing */
+	| rules
+		{ parse_save( $1.parse ); }
+	;
+
+/*
+ * block - zero or more rules
+ * rules - one or more rules
+ * rule - any one of jam's rules
+ * right-recursive so rules execute in order.
+ */
+
+block	: null
+                { $$.parse = $1.parse; }
+	| rules
+		{ $$.parse = $1.parse; }
+	;
+
+rules	: rule
+		{ $$.parse = $1.parse; }
+	| rule rules
+		{ $$.parse = prules( $1.parse, $2.parse ); }
+	| `local` list assign_list_opt `;` block
+		{ $$.parse = plocal( $2.parse, $3.parse, $5.parse ); }
+	;
+
+null    : /* empty */
+        { $$.parse = pnull(); }
+        ;
+
+assign_list_opt : `=` list
+                { $$.parse = $2.parse; $$.number = ASSIGN_SET; }
+        | null
+		{ $$.parse = $1.parse; $$.number = ASSIGN_APPEND; }
+        ;
+
+arglist_opt : `(` lol `)`
+                { $$.parse = $2.parse; }
+        |
+                { $$.parse = P0; }
+        ;
+
+local_opt : `local`
+                { $$.number = 1; }
+          | /* empty */
+                { $$.number = 0; }
+          ;
+
+rule	: `{` block `}`
+		{ $$.parse = $2.parse; }
+	| `include` list `;`
+		{ $$.parse = pincl( $2.parse ); }
+	| ARG lol `;`
+		{ $$.parse = prule( $1.string, $2.parse ); }
+	| arg assign list `;`
+		{ $$.parse = pset( $1.parse, $3.parse, $2.number ); }
+	| arg `on` list assign list `;`
+		{ $$.parse = pset1( $1.parse, $3.parse, $5.parse, $4.number ); }
+	| `return` list `;`
+		{ $$.parse = $2.parse; }
+	| `for` local_opt ARG `in` list `{` block `}`
+		{ $$.parse = pfor( $3.string, $5.parse, $7.parse, $2.number ); }
+	| `switch` list `{` cases `}`
+		{ $$.parse = pswitch( $2.parse, $4.parse ); }
+	| `if` expr `{` block `}`
+		{ $$.parse = pif( $2.parse, $4.parse, pnull() ); }
+	| `module` list `{` block `}`
+		{ $$.parse = pmodule( $2.parse, $4.parse ); }
+	| `class` lol `{` block `}`
+		{ $$.parse = pclass( $2.parse, $4.parse ); }
+	| `while` expr `{` block `}`
+		{ $$.parse = pwhile( $2.parse, $4.parse ); }
+	| `if` expr `{` block `}` `else` rule
+		{ $$.parse = pif( $2.parse, $4.parse, $7.parse ); }
+     | local_opt `rule` ARG arglist_opt rule
+		{ $$.parse = psetc( $3.string, $5.parse, $4.parse, $1.number ); }
+	| `on` arg rule
+		{ $$.parse = pon( $2.parse, $3.parse ); }
+	| `actions` eflags ARG bindlist `{`
+		{ yymode( SCAN_STRING ); }
+	  STRING
+		{ yymode( SCAN_NORMAL ); }
+	  `}`
+		{ $$.parse = psete( $3.string,$4.parse,$7.string,$2.number ); }
+	;
+
+/*
+ * assign - = or +=
+ */
+
+assign	: `=`
+		{ $$.number = ASSIGN_SET; }
+	| `+=`
+		{ $$.number = ASSIGN_APPEND; }
+	| `?=`
+		{ $$.number = ASSIGN_DEFAULT; }
+	| `default` `=`
+		{ $$.number = ASSIGN_DEFAULT; }
+	;
+
+/*
+ * expr - an expression for if
+ */
+expr	: arg
+		{ $$.parse = peval( EXPR_EXISTS, $1.parse, pnull() ); }
+	| expr `=` expr
+		{ $$.parse = peval( EXPR_EQUALS, $1.parse, $3.parse ); }
+	| expr `!=` expr
+		{ $$.parse = peval( EXPR_NOTEQ, $1.parse, $3.parse ); }
+	| expr `<` expr
+		{ $$.parse = peval( EXPR_LESS, $1.parse, $3.parse ); }
+	| expr `<=` expr
+		{ $$.parse = peval( EXPR_LESSEQ, $1.parse, $3.parse ); }
+	| expr `>` expr
+		{ $$.parse = peval( EXPR_MORE, $1.parse, $3.parse ); }
+	| expr `>=` expr
+		{ $$.parse = peval( EXPR_MOREEQ, $1.parse, $3.parse ); }
+	| expr `&` expr
+		{ $$.parse = peval( EXPR_AND, $1.parse, $3.parse ); }
+	| expr `&&` expr
+		{ $$.parse = peval( EXPR_AND, $1.parse, $3.parse ); }
+	| expr `|` expr
+		{ $$.parse = peval( EXPR_OR, $1.parse, $3.parse ); }
+	| expr `||` expr
+		{ $$.parse = peval( EXPR_OR, $1.parse, $3.parse ); }
+	| arg `in` list
+		{ $$.parse = peval( EXPR_IN, $1.parse, $3.parse ); }
+	| `!` expr
+		{ $$.parse = peval( EXPR_NOT, $2.parse, pnull() ); }
+	| `(` expr `)`
+		{ $$.parse = $2.parse; }
+	;
+
+
+/*
+ * cases - action elements inside a 'switch'
+ * case - a single action element inside a 'switch'
+ * right-recursive rule so cases can be examined in order.
+ */
+
+cases	: /* empty */
+		{ $$.parse = P0; }
+	| case cases
+		{ $$.parse = pnode( $1.parse, $2.parse ); }
+	;
+
+case	: `case` ARG `:` block
+		{ $$.parse = psnode( $2.string, $4.parse ); }
+	;
+
+/*
+ * lol - list of lists
+ * right-recursive rule so that lists can be added in order.
+ */
+
+lol	: list
+		{ $$.parse = pnode( P0, $1.parse ); }
+	| list `:` lol
+		{ $$.parse = pnode( $3.parse, $1.parse ); }
+	;
+
+/*
+ * list - zero or more args in a LIST
+ * listp - list (in puncutation only mode)
+ * arg - one ARG or function call
+ */
+
+list	: listp
+		{ $$.parse = $1.parse; yymode( SCAN_NORMAL ); }
+	;
+
+listp	: /* empty */
+		{ $$.parse = pnull(); yymode( SCAN_PUNCT ); }
+	| listp arg
+        	{ $$.parse = pappend( $1.parse, $2.parse ); }
+	;
+
+arg	: ARG
+		{ $$.parse = plist( $1.string ); }
+	| `[` { yymode( SCAN_NORMAL ); } func `]`
+		{ $$.parse = $3.parse; }
+	;
+
+/*
+ * func - a function call (inside [])
+ * This needs to be split cleanly out of 'rule'
+ */
+
+func	: arg lol
+		{ $$.parse = prule( $1.string, $2.parse ); }
+	| `on` arg arg lol
+		{ $$.parse = pon( $2.parse, prule( $3.string, $4.parse ) ); }
+	| `on` arg `return` list
+		{ $$.parse = pon( $2.parse, $4.parse ); }
+	;
+
+
+/*
+ * eflags - zero or more modifiers to 'executes'
+ * eflag - a single modifier to 'executes'
+ */
+
+eflags	: /* empty */
+		{ $$.number = 0; }
+	| eflags eflag
+		{ $$.number = $1.number | $2.number; }
+	;
+
+eflag	: `updated`
+		{ $$.number = EXEC_UPDATED; }
+	| `together`
+		{ $$.number = EXEC_TOGETHER; }
+	| `ignore`
+		{ $$.number = EXEC_IGNORE; }
+	| `quietly`
+		{ $$.number = EXEC_QUIETLY; }
+	| `piecemeal`
+		{ $$.number = EXEC_PIECEMEAL; }
+	| `existing`
+		{ $$.number = EXEC_EXISTING; }
+	;
+
+
+/*
+ * bindlist - list of variable to bind for an action
+ */
+
+bindlist : /* empty */
+		{ $$.parse = pnull(); }
+	| `bind` list
+		{ $$.parse = $2.parse; }
+	;
+
+