/bin/sh/nodetypes
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- #-
- # Copyright (c) 1991, 1993
- # The Regents of the University of California. All rights reserved.
- #
- # This code is derived from software contributed to Berkeley by
- # Kenneth Almquist.
- #
- # Redistribution and use in source and binary forms, with or without
- # modification, are permitted provided that the following conditions
- # are met:
- # 1. Redistributions of source code must retain the above copyright
- # notice, this list of conditions and the following disclaimer.
- # 2. Redistributions in binary form must reproduce the above copyright
- # notice, this list of conditions and the following disclaimer in the
- # documentation and/or other materials provided with the distribution.
- # 4. Neither the name of the University nor the names of its contributors
- # may be used to endorse or promote products derived from this software
- # without specific prior written permission.
- #
- # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- # SUCH DAMAGE.
- #
- # @(#)nodetypes 8.2 (Berkeley) 5/4/95
- # $FreeBSD$
- # This file describes the nodes used in parse trees. Unindented lines
- # contain a node type followed by a structure tag. Subsequent indented
- # lines specify the fields of the structure. Several node types can share
- # the same structure, in which case the fields of the structure should be
- # specified only once.
- #
- # A field of a structure is described by the name of the field followed
- # by a type. The currently implemented types are:
- # nodeptr - a pointer to a node
- # nodelist - a pointer to a list of nodes
- # string - a pointer to a nul terminated string
- # int - an integer
- # other - any type that can be copied by assignment
- # temp - a field that doesn't have to be copied when the node is copied
- # The last two types should be followed by the text of a C declaration for
- # the field.
- NSEMI nbinary # two commands separated by a semicolon
- type int
- ch1 nodeptr # the first child
- ch2 nodeptr # the second child
- NCMD ncmd # a simple command
- type int
- args nodeptr # the arguments
- redirect nodeptr # list of file redirections
- NPIPE npipe # a pipeline
- type int
- backgnd int # set to run pipeline in background
- cmdlist nodelist # the commands in the pipeline
- NREDIR nredir # redirection (of a compex command)
- type int
- n nodeptr # the command
- redirect nodeptr # list of file redirections
- NBACKGND nredir # run command in background
- NSUBSHELL nredir # run command in a subshell
- NAND nbinary # the && operator
- NOR nbinary # the || operator
- NIF nif # the if statement. Elif clauses are handled
- type int # using multiple if nodes.
- test nodeptr # if test
- ifpart nodeptr # then ifpart
- elsepart nodeptr # else elsepart
- NWHILE nbinary # the while statement. First child is the test
- NUNTIL nbinary # the until statement
- NFOR nfor # the for statement
- type int
- args nodeptr # for var in args
- body nodeptr # do body; done
- var string # the for variable
- NCASE ncase # a case statement
- type int
- expr nodeptr # the word to switch on
- cases nodeptr # the list of cases (NCLIST nodes)
- NCLIST nclist # a case ending with ;;
- type int
- next nodeptr # the next case in list
- pattern nodeptr # list of patterns for this case
- body nodeptr # code to execute for this case
- NCLISTFALLTHRU nclist # a case ending with ;&
- NDEFUN narg # define a function. The "next" field contains
- # the body of the function.
- NARG narg # represents a word
- type int
- next nodeptr # next word in list
- text string # the text of the word
- backquote nodelist # list of commands in back quotes
- NTO nfile # fd> fname
- NFROM nfile # fd< fname
- NFROMTO nfile # fd<> fname
- NAPPEND nfile # fd>> fname
- NCLOBBER nfile # fd>| fname
- type int
- next nodeptr # next redirection in list
- fd int # file descriptor being redirected
- fname nodeptr # file name, in a NARG node
- expfname temp char *expfname # actual file name
- NTOFD ndup # fd<&dupfd
- NFROMFD ndup # fd>&dupfd
- type int
- next nodeptr # next redirection in list
- fd int # file descriptor being redirected
- dupfd int # file descriptor to duplicate
- vname nodeptr # file name if fd>&$var
- NHERE nhere # fd<<\!
- NXHERE nhere # fd<<!
- type int
- next nodeptr # next redirection in list
- fd int # file descriptor being redirected
- doc nodeptr # input to command (NARG node)
- NNOT nnot # ! command (actually pipeline)
- type int
- com nodeptr