Interpress: Xerox PARC-тің беттік суреттеу тілі

Interpress is a page description language developed at Xerox PARC, based on the Forth programming language and an earlier graphics language called JaM. PARC was unable to commercialize Interpress. Two of its creators, Chuck Geschke and John Warnock, left Xerox, formed Adobe Systems, and produced a similar language called PostScript. Interpress is used in some Xerox printers most notable was the DocuTech Network Production Publisher, and is supported in Xerox Ventura Publisher. Interpress is also used as the output format for PARC's InterScript system, which is an editable word processor format for rich text documents. Interpress describes the desired or ideal appearance of a document that has been completely composed by some other process (emitter). All line ending, hyphenation, and line justification decisions, and in fact all decisions about the shapes and positions of the images, are made before creating the master. Since Interpress describes a document in a device independent manner, a master can be printed on a variety of devices, each of which renders its best approximation to the ideal represented by the master.

This feature set allows the ability to instruct the printer which media to use (paper size, type, color), number of copies, sides printed on as well as finishing actions such as stapling. These instructions are optional and their operation is dependent on the printer capability.

Header "Interpress/Xerox/3.0 " standard header {instructions} device instructions BEGIN start of master     {preamble} preamble     {page 1} first page     {page 2} second page END end of master

A more complex structure would include Nested Blocks and CONTENTINSTRUCTIONS, a token used to distinguish content instructions bodies from page bodies. In general, the content instructions are given precedence over the document instructions. Nested Blocks {BEGIN END} allow for constructing large documents out of smaller ones.

These are definitions that often found in the preamble since they usually apply to the entire document. Header "Interpress/Xerox/3.0 " header BEGIN start of master   { preamble start       Identifier "Xerox"       Identifier "XC1 3 3"       Identifier "Modern"       3 MAKEVEC FINDFONT       0.00635 SCALE create an 18 point font       MODIFYFONT       0 FSET place in frame[0]       Identifier "Xerox"       Identifier "XC1 3 3"       Identifier "Modern Italic"       3 MAKEVEC FINDFONT       0.00635 SCALE create an 18 point Italic font       MODIFYFONT       1 FSET place in frame[1]   } preamble end       { page 1 start       0 SETFONT set the font       0.05 0.25 SETXY set position       String "Printing text in " text to print       SHOW push text to image       1 SETFONT set the Italic font       String "Italics" text to print in Italics       SHOW   } page end END end of master