instant - manipulates ESIS from parsed SGML instance

instant [ -bhuvxHISW ] [ -t file] [ -s file] [ -c file] [ -o file] [ -D variable=value ...] [ -i id] [ -l directory] [file]

The instant program manipulates an SGML document instance in a variety of ways, including translating into a form suitable for a formatting application and printing information about this instance. Input to instant is the output of nsgmls, whose format is called Element Structure Information Set (ESIS).

The following are the possible command line options to instant. Output is sent to the standard output, except where otherwise noted.

-t file

Translate the SGML instance to another form, usually suitable for a formatting application. The file is called a translation spec, which specifies how the tags are to be translated. See transpec(5). By convention, names for file use the suffix .ts, for translation spec.

-s file

Specifies a file of mappings for SDATA entities in the instance. The file is of two columns, separated by one or more tabs. Spaces can not be used as the separator because spaces are allowable as the content of the columns. The first column is the entity data to map, the second is the string that the data is mapped to. The entity data is typically what is found in public ISO entity sets, such as the General Technical and Publishing sets. The mappings are specific to the formatting application used. For example, to map the em dash entity, [mdash ], in the Publishing set to the TeX representation, the first column would be [mdash ] and the second column ---. Lines beginning with a # are comments, and are ignored. Empty lines are also ignored.

-c file

Specifies a file of string mappings for characters in the instance. The file is of two columns, separated by white space. The first is the character to map, the second is the string that the character is mapped to. The mappings are specific to the formatting application used. Lines beginning with a # are comments, and are ignored. Empty lines are also ignored.

-d

"Data hack" EM strip newline at the beginning of data records

-f length

Set the threshold for the length, in characters, of an <Entry>, over which it is called a block of filled text, to length.

-o file

Write all output (except error and warning messages) to file file. By default, output goes to stdout.

-h

Print a text representation of the hierarchy of the instance elements. The deeper an element is in the tree, the more it is indented. The data content is not printed.

-u

Print a summary of the usage of each element in the instance. Information given includes attributes, number of children, and depth in the hierarchy.

-S

Print some statistics about element usage in the instance, including how often each element is used and how much PCDATA is contained.

-x

Print the context of each element in the instance, from each element to the root of the document tree.

-v

Validate the SGML instance based on the set of constraints or descriptions in the transpec file. This flags tells instant to turn off normal output, leaving only diagnostics.

-l directory

Try to read the translation specs or other files from in the directory directory if not found in the current directory. This is called the library directory. The environment variable TPT_LIB may also be used to specify this.

-b

Interactive browser mode. The user is prompted for actions, which include moving among and examining the various nodes in the hierarchy of the instance, displaying information about them, etc.

-I

List the IDs of all elements in the instance that have an ID. The format is more suitable for other programs than humans. Lines show the ID, element GI, filename, and line, separated by colons. (This depends on the -l option to nsgmls which provide filenames and line numbers.)

-i id

When translating the instance, begin processing at the element whose ID is id instead of the topmost element.

-D variable=value

Define the variable variable with value value.

-W

Do not print warning messages.

-H

Print a help message briefly describing the options.

file

Read the instance from the file file. This is expected to be the output of the program nsgmls. If not specified, instant reads the instance from its standard input.

In some cases it makes no sense to combine options. This is especially true if one of the options is to perform a translation. No checking is done for this.

These are the commands to the interactive browser:

cd args ...

Change to a different element in the hierarchy. cd id id will change to the element whose ID is id. cd N will change to the Nth child element of the current element. Several values of N may be specified, so the program will change to successively descending elements in the hierarchy. The string .. may appear for N to move up a level in the hierarchy (like in a unix file system). A / may be specified for N to change to the top of the hierarchy.

cont

Print the context of each element.

data N

Show the data content (PCDATA, RCDATA, and DATA) of child node N.

find spec

Find paths to elements matching spec, where spec may be one of:

parent gi

Find all elements whose parent element is gi.

child gi

Find all elements which have a child element gi.

gi gi

Find all elements whose name is gi.

attr name value

Find all elements that have a attribute name that have a value value.

id ID

Show location of element whose ID is ID. If ID is ?, it will list all IDs with the paths to them.

ls

List information about the current element in the hierarchy. This includes element name, line number in instance, context, attributes and their values, child elements, data directly within this element, and the order of the current element among its siblings.

q relation element

Report whether or not the current element has the relation relation to the named element element. Values of relation are the same as for _followrel in transpec reference page.

stat

Show statistics about the hierarchy.

sum

Show a tag usage summary about the hierarchy.

tran transpec outfile

Write translated output using trans spec transpec to file outfile. If outfile is not specified, output is sent to stdout.

tree

Print a textual representation of the hierarchy of the instance, where deeper elements are indented more.

where

Show current position in the hierarchy.

<control-D>

Exits the program.

The stat, sum, tree, cont commands take an optional first argument (of any value), which means to only consider the entire instance instead of the hierarchy from the current element.

file.ts

Translation specification file.

file.sdata

SDATA entity mapping file.

file.cmap

Character mapping file.

transpec(5), nsgmls(1), Standard Generalized Markup Language (SGML), ISO 8879.