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