Editing LSE
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Language Sensitive Editor or [[LSE]] is a text editor implemented in [[TPU]] MacroLanguage. '''Author:''' Digital Equipment Corporation (now part of HP '''Manual:''' http://h71000.www7.hp.com/doc/73FINAL/5340/5340_.htm '''Family:''' DECFamily '''Platform:''' VMS, OpenVMS '''License:''' Commercial It has the unique ability to allow programmers to insert code blocks into a text buffer and selectively expand each definition it is presented with. This allows programmers who may not be as familiar with a language (and all of its variants) to get help with the "grammar" of the language. As I recall, you would start off with a simple template, say for Pascal. (I'm inventing syntax as I go). program <<name>> <<declarations>> <<proceduresorfunctions>> begin <<code>> end. After placing the cursor on declarations and instructing [[LSE]] to expand, you might see: program <<name>> <<constdeclaration>> <<types>> <<vardeclarations>> <<proceduresorfunctions>> begin <<code>> end. Repeating the procedure for types, you might see: program <<name>> <<constdeclaration>> <<typename>> = <<scalar|type|array|set>> <<moretypes>> <<vardeclarations>> <<proceduresorfunctions>> begin <<code>> end. Selecting scalar, one might see: program <<name>> <<constdeclaration>> <<typename>> = <<real|integer|char>> <<moretypes>> <<vardeclarations>> <<proceduresorfunctions>> begin <<code>> end. As you can see by this crude example, [[LSE]] was cool because it knew the language. Literally, the user would navigate the EBNF syntax tree for the language. Naturally, this worked better on languages with simple trees and/or more syntactic sugar.
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