To allow the creation of camera-ready documents, languages like TEX and LATEX have been created. These languages can be thought of as varieties of programming language whose output controls laser printers or phototypesetters. Source language commands control details like spacing, font choice, point size, and special symbols. Using the syntax-directed compiler structure of Figure 1.3, suggest the kind of processing that might occur in each compiler phase if TEX or LATEX input was being translated. An alternative to "programming" documents is to use a sophisticated editor such as that provided in Microsoft Word or Adobe Frame Maker to interactively enter and edit the document. (Editing operations allow the choice of fonts, selection of point size, inclusion of special symbols, and so on.)

This approach to document preparation is called WYSIWYG-what you see is what you get-because the exact form of the document is always visible. What are the relative advantages and disadvantages of the two approaches? Do analogues exist for ordinary programming languages?