Chapter 12: Network Programming Desktop Publishing Translator models Latex Documentation Preparation Postscript programming language WYSIWIG Editors

Translator models Interpretation -the output is a value. Compilation - translator produces an algorithm that computes the answer Semantic Description - translator produces a description of the output

Translator models for text processing languages Interpretation : bitmap output Compilation : documents are converted to an executable program that creates an image – Postscript Semantic Description : description of the text's attributes – Microsoft Rich Text format

LaTex Documentation Preparation high-quality typesetting system de facto standard for the communication and publication of scientific documents a special version of Donald Knuth's TeX program TeX: sophisticated program designed to produce high-quality typesetting, especially for mathematical text.

Features of TeX automatic hyphenation, line justification, centering, flushing right or left, tabular aligning, formatting of complicated mathematical expressions, section and page numbering, numbering and placing of footnotes, preparation of a table of contents and an index.

TeX and LaTeX LaTeX makes TeX facilities easy to use LaTeX uses environments to define different document styles - article, report, letter, etc

Example Programming languages for document preparation Peter Loven September 2000 Hello world!

Example – cont. \documentclass{article} \title{Programming languages for document preparation} \author{Peter Loven} \date{September 2000} \begin{document} \maketitle Hello world! \end{document}

LaTeX processing The TEX compiler outputs a symbol table in Pass 1 like a regular compiler Pass 2 (optional) produces a Table of Contents Pass 3 produces the formatted document in a device-independent (dvi) form Convert the dvi form to a format that allows a particular device to display or print the result

Postscript programming language An interpreter for performing calculations – postfix execution stack Language syntax based on FORTH Painting Extensions – extension to FORTH for printing Conventions for different printing systems

WYSIWIG Editors WYSIWIG (what you see is what you get) - a file is preformatted to its final output presentation by embedded tags. The word processing program is a virtual machine designed to display those commands. All editing is immediately reflected on the screen display.

Differences between models LaTeX and MS Word - define the layout of the final document Postscript - defines a program which computes the final layout. A Postscript printer contains an interpreter that executes the Postscript program to produce the final printed document