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
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9 # modification, are permitted provided that the following conditions
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12 # notice, this list of conditions and the following disclaimer.
13 # 2. Redistributions in binary form must reproduce the above copyright
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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.
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36 # @(#)nodetypes 8.2 (Berkeley) 5/4/95
37 # $FreeBSD: src/bin/sh/nodetypes,v 1.10 2005/01/10 08:39:25 imp Exp $
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 backgnd int # set to run command in background
64 args nodeptr # the arguments
65 redirect nodeptr # list of file redirections
67 NPIPE npipe # a pipeline
69 backgnd int # set to run pipeline in background
70 cmdlist nodelist # the commands in the pipeline
72 NREDIR nredir # redirection (of a compex command)
74 n nodeptr # the command
75 redirect nodeptr # list of file redirections
77 NBACKGND nredir # run command in background
78 NSUBSHELL nredir # run command in a subshell
80 NAND nbinary # the && operator
81 NOR nbinary # the || operator
83 NIF nif # the if statement. Elif clauses are handled
84 type int # using multiple if nodes.
85 test nodeptr # if test
86 ifpart nodeptr # then ifpart
87 elsepart nodeptr # else elsepart
89 NWHILE nbinary # the while statement. First child is the test
90 NUNTIL nbinary # the until statement
92 NFOR nfor # the for statement
94 args nodeptr # for var in args
95 body nodeptr # do body; done
96 var string # the for variable
98 NCASE ncase # a case statement
100 expr nodeptr # the word to switch on
101 cases nodeptr # the list of cases (NCLIST nodes)
103 NCLIST nclist # a case
105 next nodeptr # the next case in list
106 pattern nodeptr # list of patterns for this case
107 body nodeptr # code to execute for this case
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)
146 NNOT nnot # ! command (actually pipeline)