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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