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source: kBuild/trunk/src/kash/nodetypes@ 2652

Last change on this file since 2652 was 1215, checked in by bird, 17 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
51NSEMI nbinary # two commands separated by a semicolon
52 type int
53 ch1 nodeptr # the first child
54 ch2 nodeptr # the second child
55
56NCMD 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
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 complex 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
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
105NDEFUN narg # define a function. The "next" field contains
106 # the body of the function.
107
108NARG 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
114NTO nfile # fd> fname
115NCLOBBER nfile # fd>| fname
116NFROM nfile # fd< fname
117NFROMTO nfile # fd<> fname
118NAPPEND 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
125NTOFD ndup # fd<&dupfd
126NFROMFD 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
134NHERE nhere # fd<<\!
135NXHERE 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
141NNOT nnot # ! command (actually pipeline)
142 type int
143 com nodeptr
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