2 # Copyright (c) 1991, 1993
3 # The Regents of the University of California. All rights reserved.
5 # This code is derived from software contributed to Berkeley by
8 # Redistribution and use in source and binary forms, with or without
9 # modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
17 # must display the following acknowledgement:
18 # This product includes software developed by the University of
19 # California, Berkeley and its contributors.
20 # 4. Neither the name of the University nor the names of its contributors
21 # may be used to endorse or promote products derived from this software
22 # without specific prior written permission.
24 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 # @(#)nodetypes 8.2 (Berkeley) 5/4/95
37 # $FreeBSD: head/bin/sh/nodetypes 246288 2013-02-03 15:54:57Z jilles $
39 # This file describes the nodes used in parse trees. Unindented lines
40 # contain a node type followed by a structure tag. Subsequent indented
41 # lines specify the fields of the structure. Several node types can share
42 # the same structure, in which case the fields of the structure should be
43 # specified only once.
45 # A field of a structure is described by the name of the field followed
46 # by a type. The currently implemented types are:
47 # nodeptr - a pointer to a node
48 # nodelist - a pointer to a list of nodes
49 # string - a pointer to a nul terminated string
51 # other - any type that can be copied by assignment
52 # temp - a field that doesn't have to be copied when the node is copied
53 # The last two types should be followed by the text of a C declaration for
56 NSEMI nbinary # two commands separated by a semicolon
58 ch1 nodeptr # the first child
59 ch2 nodeptr # the second child
61 NCMD ncmd # a simple command
63 args nodeptr # the arguments
64 redirect nodeptr # list of file redirections
66 NPIPE npipe # a pipeline
68 backgnd int # set to run pipeline in background
69 cmdlist nodelist # the commands in the pipeline
71 NREDIR nredir # redirection (of a compex command)
73 n nodeptr # the command
74 redirect nodeptr # list of file redirections
76 NBACKGND nredir # run command in background
77 NSUBSHELL nredir # run command in a subshell
79 NAND nbinary # the && operator
80 NOR nbinary # the || operator
82 NIF nif # the if statement. Elif clauses are handled
83 type int # using multiple if nodes.
84 test nodeptr # if test
85 ifpart nodeptr # then ifpart
86 elsepart nodeptr # else elsepart
88 NWHILE nbinary # the while statement. First child is the test
89 NUNTIL nbinary # the until statement
91 NFOR nfor # the for statement
93 args nodeptr # for var in args
94 body nodeptr # do body; done
95 var string # the for variable
97 NCASE ncase # a case statement
99 expr nodeptr # the word to switch on
100 cases nodeptr # the list of cases (NCLIST nodes)
102 NCLIST nclist # a case ending with ;;
104 next nodeptr # the next case in list
105 pattern nodeptr # list of patterns for this case
106 body nodeptr # code to execute for this case
108 NCLISTFALLTHRU nclist # a case ending with ;&
110 NDEFUN narg # define a function. The "next" field contains
111 # the body of the function.
113 NARG narg # represents a word
115 next nodeptr # next word in list
116 text string # the text of the word
117 backquote nodelist # list of commands in back quotes
119 NTO nfile # fd> fname
120 NFROM nfile # fd< fname
121 NFROMTO nfile # fd<> fname
122 NAPPEND nfile # fd>> fname
123 NCLOBBER nfile # fd>| fname
125 next nodeptr # next redirection in list
126 fd int # file descriptor being redirected
127 fname nodeptr # file name, in a NARG node
128 expfname temp char *expfname # actual file name
130 NTOFD ndup # fd<&dupfd
131 NFROMFD ndup # fd>&dupfd
133 next nodeptr # next redirection in list
134 fd int # file descriptor being redirected
135 dupfd int # file descriptor to duplicate
136 vname nodeptr # file name if fd>&$var
142 next nodeptr # next redirection in list
143 fd int # file descriptor being redirected
144 doc nodeptr # input to command (NARG node)
145 expdoc temp char *expdoc # actual document (for NXHERE)
147 NNOT nnot # ! command (actually pipeline)