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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; }
- ;
-
-
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