/bin/sh/nodetypes

  1#-
  2# Copyright (c) 1991, 1993
  3#	The Regents of the University of California.  All rights reserved.
  4#
  5# This code is derived from software contributed to Berkeley by
  6# Kenneth Almquist.
  7#
  8# Redistribution and use in source and binary forms, with or without
  9# modification, are permitted provided that the following conditions
 10# are met:
 11# 1. Redistributions of source code must retain the above copyright
 12#    notice, this list of conditions and the following disclaimer.
 13# 2. Redistributions in binary form must reproduce the above copyright
 14#    notice, this list of conditions and the following disclaimer in the
 15#    documentation and/or other materials provided with the distribution.
 16# 4. Neither the name of the University nor the names of its contributors
 17#    may be used to endorse or promote products derived from this software
 18#    without specific prior written permission.
 19#
 20# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 21# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 22# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 23# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 24# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 25# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 26# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 27# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 28# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 29# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 30# SUCH DAMAGE.
 31#
 32#	@(#)nodetypes	8.2 (Berkeley) 5/4/95
 33# $FreeBSD$
 34
 35# This file describes the nodes used in parse trees.  Unindented lines
 36# contain a node type followed by a structure tag.  Subsequent indented
 37# lines specify the fields of the structure.  Several node types can share
 38# the same structure, in which case the fields of the structure should be
 39# specified only once.
 40#
 41# A field of a structure is described by the name of the field followed
 42# by a type.  The currently implemented types are:
 43#	nodeptr - a pointer to a node
 44#	nodelist - a pointer to a list of nodes
 45#	string - a pointer to a nul terminated string
 46#	int - an integer
 47#	other - any type that can be copied by assignment
 48#	temp - a field that doesn't have to be copied when the node is copied
 49# The last two types should be followed by the text of a C declaration for
 50# the field.
 51
 52NSEMI nbinary			# two commands separated by a semicolon
 53	type	  int
 54	ch1	  nodeptr		# the first child
 55	ch2	  nodeptr		# the second child
 56
 57NCMD ncmd			# a simple command
 58	type	  int
 59	args	  nodeptr		# the arguments
 60	redirect  nodeptr		# list of file redirections
 61
 62NPIPE npipe			# a pipeline
 63	type	  int
 64	backgnd	  int			# set to run pipeline in background
 65	cmdlist	  nodelist		# the commands in the pipeline
 66
 67NREDIR nredir			# redirection (of a compex command)
 68	type	  int
 69	n	  nodeptr		# the command
 70	redirect  nodeptr		# list of file redirections
 71
 72NBACKGND nredir			# run command in background
 73NSUBSHELL nredir		# run command in a subshell
 74
 75NAND nbinary			# the && operator
 76NOR nbinary			# the || operator
 77
 78NIF nif				# the if statement.  Elif clauses are handled
 79	type	  int		    # using multiple if nodes.
 80	test	  nodeptr		# if test
 81	ifpart	  nodeptr		# then ifpart
 82	elsepart  nodeptr		# else elsepart
 83
 84NWHILE nbinary			# the while statement.  First child is the test
 85NUNTIL nbinary			# the until statement
 86
 87NFOR nfor			# the for statement
 88	type	  int
 89	args	  nodeptr		# for var in args
 90	body	  nodeptr		# do body; done
 91	var	  string		# the for variable
 92
 93NCASE ncase			# a case statement
 94	type	  int
 95	expr	  nodeptr		# the word to switch on
 96	cases	  nodeptr		# the list of cases (NCLIST nodes)
 97
 98NCLIST nclist			# a case ending with ;;
 99	type	  int
100	next	  nodeptr		# the next case in list
101	pattern	  nodeptr		# list of patterns for this case
102	body	  nodeptr		# code to execute for this case
103
104NCLISTFALLTHRU nclist		# a case ending with ;&
105
106NDEFUN narg			# define a function.  The "next" field contains
107				# the body of the function.
108
109NARG narg			# represents a word
110	type	  int
111	next	  nodeptr		# next word in list
112	text	  string		# the text of the word
113	backquote nodelist		# list of commands in back quotes
114
115NTO nfile			# fd> fname
116NFROM nfile			# fd< fname
117NFROMTO nfile			# fd<> fname
118NAPPEND nfile			# fd>> fname
119NCLOBBER nfile			# fd>| fname
120	type	  int
121	next	  nodeptr		# next redirection in list
122	fd	  int			# file descriptor being redirected
123	fname	  nodeptr		# file name, in a NARG node
124	expfname  temp	char *expfname	# actual file name
125
126NTOFD ndup			# fd<&dupfd
127NFROMFD ndup			# fd>&dupfd
128	type	  int
129	next	  nodeptr		# next redirection in list
130	fd	  int			# file descriptor being redirected
131	dupfd	  int			# file descriptor to duplicate
132	vname	  nodeptr		# file name if fd>&$var
133
134
135NHERE nhere			# fd<<\!
136NXHERE nhere			# fd<<!
137	type	  int
138	next	  nodeptr		# next redirection in list
139	fd	  int			# file descriptor being redirected
140	doc	  nodeptr		# input to command (NARG node)
141
142NNOT nnot			# ! command  (actually pipeline)
143	type	int
144	com	nodeptr