Compaq AA-PWCBD-TE 3.5 Learn Data Type

DEC Text Processing Utility Data Types
3.4 Keyword Data Type
Table 3–1 (Cont.) Keywords Used for Key Names
DECTPU Key Name VT400, VT300, VT200 Series Key VT100Key
Ctrl_Z_KEY Ctrl/Z Ctrl/Z
The OpenVMS terminal driver handles the following keys as special cases.
Compaq recommends that you avoid defining the following control characters and
function key:
• Ctrl/C
• Ctrl/O
• Ctrl/Q
• Ctrl/S
• Ctrl/T
• Ctrl/X
• Ctrl/Y
•F6
3.5 Learn Data Type
Alearn sequence is a collection of DECTPU keystrokes for use later. The
LEARN_BEGIN built-in procedure starts collecting keystrokes; the LEARN_END
built-in procedure stops the collection of keystrokes and returns a value of the
learn data type as a result. The following example assigns a learn data type to
the variable x:
LEARN_BEGIN (EXACT);
.
.
.
x := LEARN_END;
All keystrokes that you enter between the LEARN_BEGIN and LEARN_END
built-in procedures are stored in the variable x. The EXACT keyword specifies
that, when the learn sequence is replayed, the input (if any) for the built-in
procedures READ_CHAR, READ_KEY, and READ_LINE (if used in the learn
sequence) will be the same as the input entered when the learn sequence was
created. If you specify NO_EXACT, a replay of a learn sequence containing keys
that invoke the built-in procedures READ_LINE, READ_KEY, or READ_CHAR
looks for new input.
For more information on replaying a learn sequence, see LEARN_BEGIN and
LEARN_END in the DEC Text Processing Utility Reference Manual.
You can use the LEARN_ABORT built-in procedure to interrupt the execution of
a learn sequence. For information on using LEARN_ABORT, see LEARN_ABORT
in the DEC Text Processing Utility Reference Manual.
DEC Text Processing Utility Data Types 3–7