[9] | 1 | #!/bin/sh -
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| 2 | #
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| 3 | # Copyright (c) 1991 The Regents of the University of California.
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| 4 | # All rights reserved.
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| 5 | #
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| 6 | # This code is derived from software contributed to Berkeley by
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| 7 | # Kenneth Almquist.
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| 8 | #
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| 9 | # Redistribution and use in source and binary forms, with or without
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| 10 | # modification, are permitted provided that the following conditions
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| 11 | # are met:
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| 12 | # 1. Redistributions of source code must retain the above copyright
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| 13 | # notice, this list of conditions and the following disclaimer.
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| 14 | # 2. Redistributions in binary form must reproduce the above copyright
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| 15 | # notice, this list of conditions and the following disclaimer in the
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| 16 | # documentation and/or other materials provided with the distribution.
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| 17 | # 3. All advertising materials mentioning features or use of this software
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| 18 | # must display the following acknowledgement:
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| 19 | # This product includes software developed by the University of
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| 20 | # California, Berkeley and its contributors.
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| 21 | # 4. Neither the name of the University nor the names of its contributors
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| 22 | # may be used to endorse or promote products derived from this software
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| 23 | # without specific prior written permission.
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| 24 | #
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| 25 | # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 26 | # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 27 | # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 28 | # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 29 | # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 30 | # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 31 | # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 32 | # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 33 | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 34 | # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 35 | # SUCH DAMAGE.
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| 36 | #
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| 37 | # @(#)nodetypes 5.1 (Berkeley) 3/7/91
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| 38 |
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| 39 | # This file describes the nodes used in parse trees. Unindented lines
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| 40 | # contain a node type followed by a structure tag. Subsequent indented
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| 41 | # lines specify the fields of the structure. Several node types can share
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| 42 | # the same structure, in which case the fields of the structure should be
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| 43 | # specified only once.
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| 44 | #
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| 45 | # A field of a structure is described by the name of the field followed
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| 46 | # by a type. The currently implemented types are:
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| 47 | # nodeptr - a pointer to a node
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| 48 | # nodelist - a pointer to a list of nodes
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| 49 | # string - a pointer to a nul terminated string
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| 50 | # int - an integer
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| 51 | # other - any type that can be copied by assignment
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| 52 | # temp - a field that doesn't have to be copied when the node is copied
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| 53 | # The last two types should be followed by the text of a C declaration for
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| 54 | # the field.
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| 55 |
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| 56 | NSEMI nbinary # two commands separated by a semicolon
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| 57 | type int
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| 58 | ch1 nodeptr # the first child
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| 59 | ch2 nodeptr # the second child
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| 60 |
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| 61 | NCMD ncmd # a simple command
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| 62 | type int
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| 63 | backgnd int # set to run command in background
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| 64 | args nodeptr # the arguments
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| 65 | redirect nodeptr # list of file redirections
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| 66 |
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| 67 | NPIPE npipe # a pipeline
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| 68 | type int
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| 69 | backgnd int # set to run pipeline in background
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| 70 | cmdlist nodelist # the commands in the pipeline
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| 71 |
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| 72 | NREDIR nredir # redirection (of a compex command)
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| 73 | type int
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| 74 | n nodeptr # the command
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| 75 | redirect nodeptr # list of file redirections
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| 76 |
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| 77 | NBACKGND nredir # run command in background
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| 78 | NSUBSHELL nredir # run command in a subshell
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| 79 |
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| 80 | NAND nbinary # the && operator
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| 81 | NOR nbinary # the || operator
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| 82 |
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| 83 | NIF nif # the if statement. Elif clauses are handled
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| 84 | type int # using multiple if nodes.
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| 85 | test nodeptr # if test
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| 86 | ifpart nodeptr # then ifpart
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| 87 | elsepart nodeptr # else elsepart
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| 88 |
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| 89 | NWHILE nbinary # the while statement. First child is the test
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| 90 | NUNTIL nbinary # the until statement
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| 91 |
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| 92 | NFOR nfor # the for statement
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| 93 | type int
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| 94 | args nodeptr # for var in args
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| 95 | body nodeptr # do body; done
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| 96 | var string # the for variable
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| 97 |
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| 98 | NCASE ncase # a case statement
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| 99 | type int
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| 100 | expr nodeptr # the word to switch on
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| 101 | cases nodeptr # the list of cases (NCLIST nodes)
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| 102 |
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| 103 | NCLIST nclist # a case
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| 104 | type int
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| 105 | next nodeptr # the next case in list
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| 106 | pattern nodeptr # list of patterns for this case
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| 107 | body nodeptr # code to execute for this case
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| 108 |
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| 109 |
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| 110 | NDEFUN narg # define a function. The "next" field contains
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| 111 | # the body of the function.
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| 112 |
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| 113 | NARG narg # represents a word
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| 114 | type int
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| 115 | next nodeptr # next word in list
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| 116 | text string # the text of the word
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| 117 | backquote nodelist # list of commands in back quotes
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| 118 |
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| 119 | NTO nfile # fd> fname
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| 120 | NFROM nfile # fd< fname
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| 121 | NAPPEND nfile # fd>> fname
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| 122 | type int
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| 123 | next nodeptr # next redirection in list
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| 124 | fd int # file descriptor being redirected
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| 125 | fname nodeptr # file name, in a NARG node
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| 126 | expfname temp char *expfname # actual file name
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| 127 |
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| 128 | NTOFD ndup # fd<&dupfd
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| 129 | NFROMFD ndup # fd>&dupfd
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| 130 | type int
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| 131 | next nodeptr # next redirection in list
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| 132 | fd int # file descriptor being redirected
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| 133 | dupfd int # file descriptor to duplicate
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| 134 |
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| 135 | NHERE nhere # fd<<\!
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| 136 | NXHERE nhere # fd<<!
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| 137 | type int
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| 138 | next nodeptr # next redirection in list
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| 139 | fd int # file descriptor being redirected
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| 140 | doc nodeptr # input to command (NARG node)
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