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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; }
+ ;
+
+