i86/elks/elkscmd/ash/nodetypes

   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)