Text Editors Ppt

TEXT EDITORS Presented by: Anita Yadav  Roll No. 09 CSE 6th sem

Definition

of Text Editor:-

A text editor is a type type of progr program am used used for for editing plain text files. Often

provided with operating systems.

Types of of text editors 1.

Line Editors

2. Stream Editor 3. Screen Editor 4. Word Proces esssor 5. Structure Ed Editor

Line

Editor 

Scope of edit operations is limited to a line of  text. The line is designated positionally.  Advantage: Simplicity Disadvantage:-

 Does not display the text in the manner it

would appear if printed

Stream Editor  Editor  Views

the entire text as a stream of  characters. This permits edit e dit operations to cross line boundaries. Support character character,line ,line and context context oriented commands based on the current editing context context indicated indicated by the position of a text pointer.

Screen Editor  A screen editor uses the what you see is what you get principle in editor design. The user can move the cursor over the screen ,position it at the point where he desires to perform some editing and proceed with the editing directly.  Advantage: Useful while formatting the text to produce

printed documents.

ord W ord

Processors

Basically

document editors with additional features to produce well formatted hard copy output. Essential features of word processors are commands for moving sections of text from one place place to another,merg another,merging ing of text, text, and searching and replacement of words. Many word processors processors support a spell check che ck option. e.g. Wordstar

Structure Structure Editors Editors Incorporates Incorporates an awareness of the structure of  a document. Structure is specified by the user while creating or modifying the document. Editing requirements requirements are specified using the structure. A special class of structure editors editors , called syntax directed editors, are used in programming environments.

eatures F eatures

of text editors

String searching algorithm Cut, copy, and paste Text formatting Undo and redo Data

transformation

F iltering iltering

Syntax Synt ax highlighting

Pros and Cons of

Text

Editors

Advantages Text Editor 

Simple and places less demands on system. Provides greater control over the application

Disadvantages Difficult to Visualise output(e.g: to preview a webpage you have to have a suitable browser) Dependant on programming or text-based commands knowledge