1 # $NetBSD: nodetypes,v 1.12 2003/08/22 11:22:23 agc Exp $ 2 # Copyright (c) 1991, 1993 3 # The Regents of the University of California. All rights reserved. 4 # 5 # This code is derived from software contributed to Berkeley by 6 # Kenneth Almquist. 7 # 8 # Redistribution and use in source and binary forms, with or without 9 # modification, are permitted provided that the following conditions 10 # are met: 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. 19 # 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 24 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 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 30 # SUCH DAMAGE. 31 # 32 # @(#)nodetypes 8.2 (Berkeley) 5/4/95 33 34 # This file describes the nodes used in parse trees. Unindented lines 35 # contain a node type followed by a structure tag. Subsequent indented 36 # lines specify the fields of the structure. Several node types can share 37 # the same structure, in which case the fields of the structure should be 38 # specified only once. 39 # 40 # A field of a structure is described by the name of the field followed 41 # by a type. The currently implemented types are: 42 # nodeptr - a pointer to a node 43 # nodelist - a pointer to a list of nodes 44 # string - a pointer to a nul terminated string 45 # int - an integer 46 # other - any type that can be copied by assignment 47 # temp - a field that doesn't have to be copied when the node is copied 48 # The last two types should be followed by the text of a C declaration for 49 # the field. 50 51 NSEMI nbinary # two commands separated by a semicolon 52 type int 53 ch1 nodeptr # the first child 54 ch2 nodeptr # the second child 55 56 NCMD ncmd # a simple command 57 type int 58 backgnd int # set to run command in background 59 args nodeptr # the arguments 60 redirect nodeptr # list of file redirections 61 62 NPIPE npipe # a pipeline 63 type int 64 backgnd int # set to run pipeline in background 65 cmdlist nodelist # the commands in the pipeline 66 67 NREDIR nredir # redirection (of a complex command) 68 type int 69 n nodeptr # the command 70 redirect nodeptr # list of file redirections 71 72 NBACKGND nredir # run command in background 73 NSUBSHELL nredir # run command in a subshell 74 75 NAND nbinary # the && operator 76 NOR nbinary # the || operator 77 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 83 84 NWHILE nbinary # the while statement. First child is the test 85 NUNTIL nbinary # the until statement 86 87 NFOR nfor # the for statement 88 type int 89 args nodeptr # for var in args 90 body nodeptr # do body; done 91 var string # the for variable 92 93 NCASE ncase # a case statement 94 type int 95 expr nodeptr # the word to switch on 96 cases nodeptr # the list of cases (NCLIST nodes) 97 98 NCLIST nclist # a case 99 type int 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 103 104 105 NDEFUN narg # define a function. The "next" field contains 106 # the body of the function. 107 108 NARG narg # represents a word 109 type int 110 next nodeptr # next word in list 111 text string # the text of the word 112 backquote nodelist # list of commands in back quotes 113 114 NTO nfile # fd> fname 115 NCLOBBER nfile # fd>| fname 116 NFROM nfile # fd< fname 117 NFROMTO nfile # fd<> fname 118 NAPPEND nfile # fd>> fname 119 type int 120 next nodeptr # next redirection in list 121 fd int # file descriptor being redirected 122 fname nodeptr # file name, in a NARG node 123 expfname temp char *expfname # actual file name 124 125 NTOFD ndup # fd<&dupfd 126 NFROMFD ndup # fd>&dupfd 127 type int 128 next nodeptr # next redirection in list 129 fd int # file descriptor being redirected 130 dupfd int # file descriptor to duplicate 131 vname nodeptr # file name if fd>&$var 132 133 134 NHERE nhere # fd<<\! 135 NXHERE nhere # fd<<! 136 type int 137 next nodeptr # next redirection in list 138 fd int # file descriptor being redirected 139 doc nodeptr # input to command (NARG node) 140 141 NNOT nnot # ! command (actually pipeline) 142 type int 143 com nodeptr 144
