Sometimes after an accept method has read some input from the user, it may be necessary to insert a modified version of that input back into the input buffer. The following two functions can be used to modify the input buffer:
Arguments: stream new-input
start end buffer-start rescan
Summary: Replaces the part of the input editing stream stream 's input buffer that extends from buffer-start to its scan pointer with the string new-input . buffer-start defaults to the current input position of stream. start and end can be supplied to specify a subsequence of new-input ; start defaults to 0 and end defaults to the length of new-input .
replace-input queues a rescan by calling queue-rescan if the new input does not match the old output, or if rescan is t .
The returned value is the position in the input buffer.
Arguments: stream object type view
buffer-start rescan query-identifier for-context-type
Summary: Like replace-input , except that the new input to insert into the input buffer is obtained by presenting the object object with the presentation type type and view view. buffer-start and rescan are as for replace-input , query-identifier is as for accept , and for-context-type is as for present .
If the object does not have a readable representation (in the Lisp sense), presentation-replace-input may create an "accept result" to represent the object and insert it into the input buffer. For the purposes of input editing, "accept results" must be treated as a single input gesture.
The following two functions are used to read or write a token (that is, a string):
input-wait-handler pointer-button-press-handler click-only
Summary: Reads characters from the interactive steam stream until it encounters a delimiter, activation, or pointer gesture. Returns the accumulated string that was delimited by the delimiter or activation gesture, leaving the delimiter unread.
If the first character of typed input is a quotation mark (
will ignore delimiter gestures until another quotation mark is seen. When the closing quotation mark is seen,
will proceed as discussed previously.
If the boolean click-only is t , then no keyboard input is allowed. In that case, read-token will simply ignore any typed characters.
input-wait-handler and pointer-button-press-handler are as for stream-read-gesture . Refer to 15.2.1, The Extended Input Stream Protocol for details.
Arguments: token stream
is the opposite of
; given the string token, it writes it to the interactive stream stream. If
and there are any characters in the token that are delimiter gestures (see
will surround the token with quotation marks (
Typically, present methods will use write-token instead of write-string .