[unix-history] / usr / src / bin / sh / nodetypes

#!/bin/sh -
#
# Copyright (c) 1991 The Regents of the University of California.
# All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# Kenneth Almquist.
#
# %sccs.include.redist.sh%
#
#	@(#)nodetypes	5.1 (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
# 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
NAPPEND 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

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)
Commit	Line	Data
9b18046c KB	1	#!/bin/sh -
	2	#
	3	# Copyright (c) 1991 The Regents of the University of California.
	4	# All rights reserved.
	5	#
	6	# This code is derived from software contributed to Berkeley by
	7	# Kenneth Almquist.
	8	#
	9	# %sccs.include.redist.sh%
	10	#
	11	# @(#)nodetypes 5.1 (Berkeley) %G%
	12
	13	# This file describes the nodes used in parse trees. Unindented lines
	14	# contain a node type followed by a structure tag. Subsequent indented
	15	# lines specify the fields of the structure. Several node types can share
	16	# the same structure, in which case the fields of the structure should be
	17	# specified only once.
	18	#
	19	# A field of a structure is described by the name of the field followed
	20	# by a type. The currently implemented types are:
	21	# nodeptr - a pointer to a node
	22	# nodelist - a pointer to a list of nodes
	23	# string - a pointer to a nul terminated string
	24	# int - an integer
	25	# other - any type that can be copied by assignment
	26	# temp - a field that doesn't have to be copied when the node is copied
	27	# The last two types should be followed by the text of a C declaration for
	28	# the field.
	29
	30	NSEMI nbinary # two commands separated by a semicolon
	31	type int
	32	ch1 nodeptr # the first child
	33	ch2 nodeptr # the second child
	34
	35	NCMD ncmd # a simple command
	36	type int
	37	backgnd int # set to run command in background
	38	args nodeptr # the arguments
	39	redirect nodeptr # list of file redirections
	40
	41	NPIPE npipe # a pipeline
	42	type int
	43	backgnd int # set to run pipeline in background
	44	cmdlist nodelist # the commands in the pipeline
	45
	46	NREDIR nredir # redirection (of a compex command)
	47	type int
	48	n nodeptr # the command
	49	redirect nodeptr # list of file redirections
	50
	51	NBACKGND nredir # run command in background
	52	NSUBSHELL nredir # run command in a subshell
	53
	54	NAND nbinary # the && operator
	55	NOR nbinary # the \|\| operator
	56
	57	NIF nif # the if statement. Elif clauses are handled
	58	type int # using multiple if nodes.
	59	test nodeptr # if test
	60	ifpart nodeptr # then ifpart
	61	elsepart nodeptr # else elsepart
	62
	63	NWHILE nbinary # the while statement. First child is the test
	64	NUNTIL nbinary # the until statement
65
66	NFOR nfor # the for statement
67	type int
68	args nodeptr # for var in args
69	body nodeptr # do body; done
70	var string # the for variable
71
72	NCASE ncase # a case statement
73	type int
74	expr nodeptr # the word to switch on
75	cases nodeptr # the list of cases (NCLIST nodes)
76
77	NCLIST nclist # a case
78	type int
79	next nodeptr # the next case in list
80	pattern nodeptr # list of patterns for this case
81	body nodeptr # code to execute for this case
82
83
84	NDEFUN narg # define a function. The "next" field contains
85	# the body of the function.
86
87	NARG narg # represents a word
88	type int
89	next nodeptr # next word in list
90	text string # the text of the word
91	backquote nodelist # list of commands in back quotes
92
93	NTO nfile # fd> fname
94	NFROM nfile # fd< fname
95	NAPPEND nfile # fd>> fname
96	type int
97	next nodeptr # next redirection in list
98	fd int # file descriptor being redirected
99	fname nodeptr # file name, in a NARG node
100	expfname temp char *expfname # actual file name
101
102	NTOFD ndup # fd<&dupfd
103	NFROMFD ndup # fd>&dupfd
104	type int
105	next nodeptr # next redirection in list
106	fd int # file descriptor being redirected
107	dupfd int # file descriptor to duplicate
108
109	NHERE nhere # fd<<\!
110	NXHERE nhere # fd<<!
111	type int
112	next nodeptr # next redirection in list
113	fd int # file descriptor being redirected
114	doc nodeptr # input to command (NARG node)