Position Components

As previously noted, each position object has two components; one number defining the column, the other defining the line that the position represents. These components can be accessed individually.

Function: pos-col pos

Returns the column which the position object pos points to.

(pos-col (pos 1 2))
    => 1

Function: pos-line pos

This function returns the line number which pos points to.

Function: set-pos-col pos new-col

Sets the number of the column which the position object pos points to, to new-col (an integer), then returns col.

(setq x (pos 1 2))
    => #<pos 1 2>
(set-pos-col x 3)
    => 3
x
    => #<pos 3 2>

Function: set-pos-line pos new-line

Similar to set-pos-col except the line number is modified.

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