30.1 Point

Point is a special buffer position used by many editing commands, including the self-inserting typed characters and text insertion functions. Other commands move point through the text to allow editing and insertion at different places.

Like other positions, point designates a place between two characters (or before the first character, or after the last character), rather than a particular character. Usually terminals display the cursor over the character that immediately follows point; point is actually before the character on which the cursor sits.

The value of point is a number no less than 1, and no greater than the buffer size plus 1. If narrowing is in effect (voir la section Narrowing), then point is constrained to fall within the accessible portion of the buffer (possibly at one end of it).

Each buffer has its own value of point, which is independent of the value of point in other buffers. Each window also has a value of point, which is independent of the value of point in other windows on the same buffer. This is why point can have different values in various windows that display the same buffer. When a buffer appears in only one window, the buffer's point and the window's point normally have the same value, so the distinction is rarely important. Voir la section Windows and Point, for more details.

Function: point

This function returns the value of point in the current buffer, as an integer.

(point) ⇒ 175

Function: point-min

This function returns the minimum accessible value of point in the current buffer. This is normally 1, but if narrowing is in effect, it is the position of the start of the region that you narrowed to. (Voir la section Narrowing.)

Function: point-max

This function returns the maximum accessible value of point in the current buffer. This is (1+ (buffer-size)), unless narrowing is in effect, in which case it is the position of the end of the region that you narrowed to. (Voir la section Narrowing.)

Function: buffer-end flag

This function returns (point-max) if flag is greater than 0, (point-min) otherwise. The argument flag must be a number.

Function: buffer-size &optional buffer

This function returns the total number of characters in the current buffer. In the absence of any narrowing (voir la section Narrowing), point-max returns a value one larger than this.

If you specify a buffer, buffer, then the value is the size of buffer.

(buffer-size) ⇒ 35 (point-max) ⇒ 36

Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.