nodetypes@ 1223

Last change on this file since 1223 was 629, checked in by bird, 18 years ago
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1	# $NetBSD: nodetypes,v 1.12 2003/08/22 11:22:23 agc Exp $
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	# 3. 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
34	# This file describes the nodes used in parse trees. Unindented lines
35	# contain a node type followed by a structure tag. Subsequent indented
36	# lines specify the fields of the structure. Several node types can share
37	# the same structure, in which case the fields of the structure should be
38	# specified only once.
39	#
40	# A field of a structure is described by the name of the field followed
41	# by a type. The currently implemented types are:
42	# nodeptr - a pointer to a node
43	# nodelist - a pointer to a list of nodes
44	# string - a pointer to a nul terminated string
45	# int - an integer
46	# other - any type that can be copied by assignment
47	# temp - a field that doesn't have to be copied when the node is copied
48	# The last two types should be followed by the text of a C declaration for
49	# the field.
50
51	NSEMI nbinary # two commands separated by a semicolon
52	type int
53	ch1 nodeptr # the first child
54	ch2 nodeptr # the second child
55
56	NCMD ncmd # a simple command
57	type int
58	backgnd int # set to run command in background
59	args nodeptr # the arguments
60	redirect nodeptr # list of file redirections
61
62	NPIPE npipe # a pipeline
63	type int
64	backgnd int # set to run pipeline in background
65	cmdlist nodelist # the commands in the pipeline
66
67	NREDIR nredir # redirection (of a complex command)
68	type int
69	n nodeptr # the command
70	redirect nodeptr # list of file redirections
71
72	NBACKGND nredir # run command in background
73	NSUBSHELL nredir # run command in a subshell
74
75	NAND nbinary # the && operator
76	NOR nbinary # the \|\| operator
77
78	NIF 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
84	NWHILE nbinary # the while statement. First child is the test
85	NUNTIL nbinary # the until statement
86
87	NFOR 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
93	NCASE 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
98	NCLIST nclist # a case
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
104
105	NDEFUN narg # define a function. The "next" field contains
106	# the body of the function.
107
108	NARG narg # represents a word
109	type int
110	next nodeptr # next word in list
111	text string # the text of the word
112	backquote nodelist # list of commands in back quotes
113
114	NTO nfile # fd> fname
115	NCLOBBER nfile # fd>\| fname
116	NFROM nfile # fd< fname
117	NFROMTO nfile # fd<> fname
118	NAPPEND nfile # fd>> fname
119	type int
120	next nodeptr # next redirection in list
121	fd int # file descriptor being redirected
122	fname nodeptr # file name, in a NARG node
123	expfname temp char *expfname # actual file name
124
125	NTOFD ndup # fd<&dupfd
126	NFROMFD ndup # fd>&dupfd
127	type int
128	next nodeptr # next redirection in list
129	fd int # file descriptor being redirected
130	dupfd int # file descriptor to duplicate
131	vname nodeptr # file name if fd>&$var
132
133
134	NHERE nhere # fd<<\!
135	NXHERE nhere # fd<<!
136	type int
137	next nodeptr # next redirection in list
138	fd int # file descriptor being redirected
139	doc nodeptr # input to command (NARG node)
140
141	NNOT nnot # ! command (actually pipeline)
142	type int
143	com nodeptr

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