Info Catalog elisp: Markers elisp: Top elisp: Non-ASCII Characters

elisp: Text

 
 31 Text
 *******
 
 This chapter describes the functions that deal with the text in a
 buffer.  Most examine, insert, or delete text in the current buffer,
 often operating at point or on text adjacent to point.  Many are
 interactive.  All the functions that change the text provide for undoing
 the changes (Undo).
 
    Many text-related functions operate on a region of text defined by
 two buffer positions passed in arguments named START and END.  These
 arguments should be either markers (Markers) or numeric
 character positions (Positions).  The order of these arguments
 does not matter; it is all right for START to be the end of the region
 and END the beginning.  For example, ‘(delete-region 1 10)’ and
 ‘(delete-region 10 1)’ are equivalent.  An ‘args-out-of-range’ error is
 signaled if either START or END is outside the accessible portion of the
 buffer.  In an interactive call, point and the mark are used for these
 arguments.
 
    Throughout this chapter, “text” refers to the characters in the
 buffer, together with their properties (when relevant).  Keep in mind
 that point is always between two characters, and the cursor appears on
 the character after point.
 

Menu

 
· Near Point       Examining text in the vicinity of point.
· Buffer Contents  Examining text in a general fashion.
· Comparing Text   Comparing substrings of buffers.
· Insertion        Adding new text to a buffer.
· Commands for Insertion  User-level commands to insert text.
· Deletion         Removing text from a buffer.
· User-Level Deletion     User-level commands to delete text.
· The Kill Ring    Where removed text sometimes is saved for later use.
· Undo             Undoing changes to the text of a buffer.
· Maintaining Undo How to enable and disable undo information.
                         How to control how much information is kept.
· Filling          Functions for explicit filling.
· Margins          How to specify margins for filling commands.
· Adaptive Fill    Adaptive Fill mode chooses a fill prefix from context.
· Auto Filling     How auto-fill mode is implemented to break lines.
· Sorting          Functions for sorting parts of the buffer.
· Columns          Computing horizontal positions, and using them.
· Indentation      Functions to insert or adjust indentation.
· Case Changes     Case conversion of parts of the buffer.
· Text Properties  Assigning Lisp property lists to text characters.
· Substitution     Replacing a given character wherever it appears.
· Registers        How registers are implemented.  Accessing the text or
                        position stored in a register.
· Transposition    Swapping two portions of a buffer.
· Decompression    Dealing with compressed data.
· Base 64          Conversion to or from base 64 encoding.
· Checksum/Hash    Computing cryptographic hashes.
· Parsing HTML/XML Parsing HTML and XML.
· Atomic Changes   Installing several buffer changes atomically.
· Change Hooks     Supplying functions to be run when text is changed.
 

Info Catalog elisp: Markers elisp: Top elisp: Non-ASCII Characters