1#- 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# 4. 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# $FreeBSD$ 34 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. 40# 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 46# int - an integer 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 50# the field. 51 52NSEMI nbinary # two commands separated by a semicolon 53 type int 54 ch1 nodeptr # the first child 55 ch2 nodeptr # the second child 56 57NCMD ncmd # a simple command 58 type int 59 args nodeptr # the arguments 60 redirect nodeptr # list of file redirections 61 62NPIPE npipe # a pipeline 63 type int 64 backgnd int # set to run pipeline in background 65 cmdlist nodelist # the commands in the pipeline 66 67NREDIR nredir # redirection (of a compex command) 68 type int 69 n nodeptr # the command 70 redirect nodeptr # list of file redirections 71 72NBACKGND nredir # run command in background 73NSUBSHELL nredir # run command in a subshell 74 75NAND nbinary # the && operator 76NOR nbinary # the || operator 77 78NIF 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 84NWHILE nbinary # the while statement. First child is the test 85NUNTIL nbinary # the until statement 86 87NFOR 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 93NCASE 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 98NCLIST nclist # a case ending with ;; 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 104NCLISTFALLTHRU nclist # a case ending with ;& 105 106NDEFUN narg # define a function. The "next" field contains 107 # the body of the function. 108 109NARG narg # represents a word 110 type int 111 next nodeptr # next word in list 112 text string # the text of the word 113 backquote nodelist # list of commands in back quotes 114 115NTO nfile # fd> fname 116NFROM nfile # fd< fname 117NFROMTO nfile # fd<> fname 118NAPPEND nfile # fd>> fname 119NCLOBBER nfile # fd>| fname 120 type int 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 125 126NTOFD ndup # fd<&dupfd 127NFROMFD ndup # fd>&dupfd 128 type int 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 133 134 135NHERE nhere # fd<<\! 136NXHERE nhere # fd<<! 137 type int 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 char *expdoc # actual document (for NXHERE) 142 143NNOT nnot # ! command (actually pipeline) 144 type int 145 com nodeptr 146