# Copyright (c) 1991, 1993
# The Regents of the University of California. All rights reserved.
# This code is derived from software contributed to Berkeley by
# %sccs.include.redist.sh%
# @(#)nodetypes 8.2 (Berkeley) %G%
# 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
# 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
# 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
NSEMI nbinary # two commands separated by a semicolon
ch1 nodeptr # the first child
ch2 nodeptr # the second child
NCMD ncmd # a simple command
backgnd int # set to run command in background
args nodeptr # the arguments
redirect nodeptr # list of file redirections
backgnd int # set to run pipeline in background
cmdlist nodelist # the commands in the pipeline
NREDIR nredir # redirection (of a compex 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.
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
args nodeptr # for var in args
body nodeptr # do body; done
var string # the for variable
NCASE ncase # a case statement
expr nodeptr # the word to switch on
cases nodeptr # the list of cases (NCLIST nodes)
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
next nodeptr # next word in list
text string # the text of the word
backquote nodelist # list of commands in back quotes
NAPPEND nfile # fd>> fname
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
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
next nodeptr # next redirection in list
fd int # file descriptor being redirected
doc nodeptr # input to command (NARG node)
NNOT nnot # ! command (actually pipeline)