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. 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.
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
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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
32 # @(#)nodetypes 8.2 (Berkeley) 5/4/95
35 # This file describes the nodes used in parse trees. Unindented lines
36 # contain a node type followed by a structure tag. Subsequent indented
37 # lines specify the fields of the structure. Several node types can share
38 # the same structure, in which case the fields of the structure should be
39 # specified only once.
41 # A field of a structure is described by the name of the field followed
42 # by a type. The currently implemented types are:
43 # nodeptr - a pointer to a node
44 # nodelist - a pointer to a list of nodes
45 # string - a pointer to a nul terminated string
47 # other - any type that can be copied by assignment
48 # temp - a field that doesn't have to be copied when the node is copied
49 # The last two types should be followed by the text of a C declaration for
52 NSEMI nbinary # two commands separated by a semicolon
54 ch1 nodeptr # the first child
55 ch2 nodeptr # the second child
57 NCMD ncmd # a simple command
59 args nodeptr # the arguments
60 redirect nodeptr # list of file redirections
62 NPIPE npipe # a pipeline
64 backgnd int # set to run pipeline in background
65 cmdlist nodelist # the commands in the pipeline
67 NREDIR nredir # redirection (of a compex command)
69 n nodeptr # the command
70 redirect nodeptr # list of file redirections
72 NBACKGND nredir # run command in background
73 NSUBSHELL nredir # run command in a subshell
75 NAND nbinary # the && operator
76 NOR nbinary # the || operator
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
84 NWHILE nbinary # the while statement. First child is the test
85 NUNTIL nbinary # the until statement
87 NFOR nfor # the for statement
89 args nodeptr # for var in args
90 body nodeptr # do body; done
91 var string # the for variable
93 NCASE ncase # a case statement
95 expr nodeptr # the word to switch on
96 cases nodeptr # the list of cases (NCLIST nodes)
98 NCLIST nclist # a case ending with ;;
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
104 NCLISTFALLTHRU nclist # a case ending with ;&
106 NDEFUN narg # define a function. The "next" field contains
107 # the body of the function.
109 NARG narg # represents a word
111 next nodeptr # next word in list
112 text string # the text of the word
113 backquote nodelist # list of commands in back quotes
115 NTO nfile # fd> fname
116 NFROM nfile # fd< fname
117 NFROMTO nfile # fd<> fname
118 NAPPEND nfile # fd>> fname
119 NCLOBBER nfile # fd>| fname
121 fd int # file descriptor being redirected
122 next nodeptr # next redirection in list
123 fname nodeptr # file name, in a NARG node
124 expfname temp char *expfname # actual file name
126 NTOFD ndup # fd<&dupfd
127 NFROMFD ndup # fd>&dupfd
129 fd int # file descriptor being redirected
130 next nodeptr # next redirection in list
131 dupfd int # file descriptor to duplicate
132 vname nodeptr # file name if fd>&$var
138 fd int # file descriptor being redirected
139 next nodeptr # next redirection in list
140 doc nodeptr # input to command (NARG node)
141 expdoc temp const char *expdoc # actual document (for NXHERE)
143 NNOT nnot # ! command (actually pipeline)