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#	$NetBSD: nodetypes,v 1.9 1999/02/04 16:17:39 christos Exp $

# Copyright (c) 1991, 1993

#	The Regents of the University of California.  All rights reserved.

#

# This code is derived from software contributed to Berkeley by

# Kenneth Almquist.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

# 1. Redistributions of source code must retain the above copyright

#    notice, this list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright

#    notice, this list of conditions and the following disclaimer in the

#    documentation and/or other materials provided with the distribution.

# 3. All advertising materials mentioning features or use of this software

#    must display the following acknowledgement:

#	This product includes software developed by the University of

#	California, Berkeley and its contributors.

# 4. Neither the name of the University nor the names of its contributors

#    may be used to endorse or promote products derived from this software

#    without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

# SUCH DAMAGE.

#

#	@(#)nodetypes	8.2 (Berkeley) 5/4/95

# This file describes the nodes used in parse trees.  Unindented lines

# contain a node type followed by a structure tag.  Subsequent indented

# lines specify the fields of the structure.  Several node types can share

# the same structure, in which case the fields of the structure should be

# specified only once.

#

# A field of a structure is described by the name of the field followed

# by a type.  The currently implemented types are:

#	nodeptr - a pointer to a node

#	nodelist - a pointer to a list of nodes

#	string - a pointer to a nul terminated string

#	int - an integer

#	other - any type that can be copied by assignment

#	temp - a field that doesn't have to be copied when the node is copied

# The last two types should be followed by the text of a C declaration for

# the field.

NSEMI nbinary			# two commands separated by a semicolon

	type	  int

	ch1	  nodeptr		# the first child

	ch2	  nodeptr		# the second child

NCMD ncmd			# a simple command

	type	  int

	backgnd	  int			# set to run command in background

	args	  nodeptr		# the arguments

	redirect  nodeptr		# list of file redirections

NPIPE npipe			# a pipeline

	type	  int

	backgnd	  int			# set to run pipeline in background

	cmdlist	  nodelist		# the commands in the pipeline

NREDIR nredir			# redirection (of a compex command)

	type	  int

	n	  nodeptr		# the command

	redirect  nodeptr		# list of file redirections

NBACKGND nredir			# run command in background

NSUBSHELL nredir		# run command in a subshell

NAND nbinary			# the && operator

NOR nbinary			# the || operator

NIF nif				# the if statement.  Elif clauses are handled

	type	  int		    # using multiple if nodes.

	test	  nodeptr		# if test

	ifpart	  nodeptr		# then ifpart

	elsepart  nodeptr		# else elsepart

NWHILE nbinary			# the while statement.  First child is the test

NUNTIL nbinary			# the until statement

NFOR nfor			# the for statement

	type	  int

	args	  nodeptr		# for var in args

	body	  nodeptr		# do body; done

	var	  string		# the for variable

NCASE ncase			# a case statement

	type	  int

	expr	  nodeptr		# the word to switch on

	cases	  nodeptr		# the list of cases (NCLIST nodes)

NCLIST nclist			# a case

	type	  int

	next	  nodeptr		# the next case in list

	pattern	  nodeptr		# list of patterns for this case

	body	  nodeptr		# code to execute for this case

NDEFUN narg			# define a function.  The "next" field contains

				# the body of the function.

NARG narg			# represents a word

	type	  int

	next	  nodeptr		# next word in list

	text	  string		# the text of the word

	backquote nodelist		# list of commands in back quotes

NTO nfile			# fd> fname

NFROM nfile			# fd< fname

NFROMTO nfile			# fd<> fname

NAPPEND nfile			# fd>> fname

NTOOV nfile			# fd>| fname

	type	  int

	next	  nodeptr		# next redirection in list

	fd	  int			# file descriptor being redirected

	fname	  nodeptr		# file name, in a NARG node

	expfname  temp	char *expfname	# actual file name

NTOFD ndup			# fd<&dupfd

NFROMFD ndup			# fd>&dupfd

	type	  int

	next	  nodeptr		# next redirection in list

	fd	  int			# file descriptor being redirected

	dupfd	  int			# file descriptor to duplicate

	vname	  nodeptr		# file name if fd>&$var

NHERE nhere			# fd<<\!

NXHERE nhere			# fd<<!

	type	  int

	next	  nodeptr		# next redirection in list

	fd	  int			# file descriptor being redirected

	doc	  nodeptr		# input to command (NARG node)

NNOT nnot			# ! command  (actually pipeline)

	type	int

	com	nodeptr