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1 | #!/bin/sh - |
2 | # | |
3 | # Copyright (c) 1991 The Regents of the University of California. | |
4 | # All rights reserved. | |
5 | # | |
6 | # This code is derived from software contributed to Berkeley by | |
7 | # Kenneth Almquist. | |
8 | # | |
9 | # Redistribution and use in source and binary forms, with or without | |
10 | # modification, are permitted provided that the following conditions | |
11 | # are met: | |
12 | # 1. Redistributions of source code must retain the above copyright | |
13 | # notice, this list of conditions and the following disclaimer. | |
14 | # 2. Redistributions in binary form must reproduce the above copyright | |
15 | # notice, this list of conditions and the following disclaimer in the | |
16 | # documentation and/or other materials provided with the distribution. | |
17 | # 3. All advertising materials mentioning features or use of this software | |
18 | # must display the following acknowledgement: | |
19 | # This product includes software developed by the University of | |
20 | # California, Berkeley and its contributors. | |
21 | # 4. Neither the name of the University nor the names of its contributors | |
22 | # may be used to endorse or promote products derived from this software | |
23 | # without specific prior written permission. | |
24 | # | |
25 | # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
26 | # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
30 | # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
31 | # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
32 | # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
33 | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
34 | # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
35 | # SUCH DAMAGE. | |
36 | # | |
37 | # @(#)nodetypes 5.1 (Berkeley) 3/7/91 | |
38 | ||
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. | |
44 | # | |
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 | |
50 | # int - an integer | |
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 | |
54 | # the field. | |
55 | ||
56 | NSEMI nbinary # two commands separated by a semicolon | |
57 | type int | |
58 | ch1 nodeptr # the first child | |
59 | ch2 nodeptr # the second child | |
60 | ||
61 | NCMD ncmd # a simple command | |
62 | type int | |
63 | backgnd int # set to run command in background | |
64 | args nodeptr # the arguments | |
65 | redirect nodeptr # list of file redirections | |
66 | ||
67 | NPIPE npipe # a pipeline | |
68 | type int | |
69 | backgnd int # set to run pipeline in background | |
70 | cmdlist nodelist # the commands in the pipeline | |
71 | ||
72 | NREDIR nredir # redirection (of a compex command) | |
73 | type int | |
74 | n nodeptr # the command | |
75 | redirect nodeptr # list of file redirections | |
76 | ||
77 | NBACKGND nredir # run command in background | |
78 | NSUBSHELL nredir # run command in a subshell | |
79 | ||
80 | NAND nbinary # the && operator | |
81 | NOR nbinary # the || operator | |
82 | ||
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 | |
88 | ||
89 | NWHILE nbinary # the while statement. First child is the test | |
90 | NUNTIL nbinary # the until statement | |
91 | ||
92 | NFOR nfor # the for statement | |
93 | type int | |
94 | args nodeptr # for var in args | |
95 | body nodeptr # do body; done | |
96 | var string # the for variable | |
97 | ||
98 | NCASE ncase # a case statement | |
99 | type int | |
100 | expr nodeptr # the word to switch on | |
101 | cases nodeptr # the list of cases (NCLIST nodes) | |
102 | ||
103 | NCLIST nclist # a case | |
104 | type int | |
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 | |
108 | ||
109 | ||
110 | NDEFUN narg # define a function. The "next" field contains | |
111 | # the body of the function. | |
112 | ||
113 | NARG narg # represents a word | |
114 | type int | |
115 | next nodeptr # next word in list | |
116 | text string # the text of the word | |
117 | backquote nodelist # list of commands in back quotes | |
118 | ||
119 | NTO nfile # fd> fname | |
120 | NFROM nfile # fd< fname | |
121 | NAPPEND nfile # fd>> fname | |
122 | type int | |
123 | next nodeptr # next redirection in list | |
124 | fd int # file descriptor being redirected | |
125 | fname nodeptr # file name, in a NARG node | |
126 | expfname temp char *expfname # actual file name | |
127 | ||
128 | NTOFD ndup # fd<&dupfd | |
129 | NFROMFD ndup # fd>&dupfd | |
130 | type int | |
131 | next nodeptr # next redirection in list | |
132 | fd int # file descriptor being redirected | |
133 | dupfd int # file descriptor to duplicate | |
134 | ||
135 | NHERE nhere # fd<<\! | |
136 | NXHERE nhere # fd<<! | |
137 | type int | |
138 | next nodeptr # next redirection in list | |
139 | fd int # file descriptor being redirected | |
140 | doc nodeptr # input to command (NARG node) |