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Defined functions
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Algorithms written in APL are called defined functions. A defined function consists of a header line and zero or more body lines. The header line indicates the name and syntax class of the function and gives a list of names to be localised and, in the case of argument names, initialised. Each body line consists of an optional label followed by an APL line to be evaluated. Body lines are evaluated in the order in which they occur in the defined function unless a statement beginning with a right arrow is evaluated.A defined function is established in a workspace by the system function □
FX,
by actions in function definition mode, or by the system command )
COPY.
In this standard, a
defined-function
is represented as an object with three attributes:
canonical-representation,
trace-vector,
and
stop-vector.
A
defined-function
is called when its
name
occurs in a
prefix
of the
current-stack
matching one of the
patterns
in the
phrase-table.
A
defined-function
is called by the operation
call defined function.
This operation prefixes the
state-indicator
with a new
context,
localises and initialises any local names in the
header-line,
and calls the operation
defined-function-control.
A
defined-function
ends when
defined-function-control
finds
current-line-number
set to a value not in the
closed-interval-between one
and
last-line-number.
At this point, the first
item
of the
state-indicator
is discarded and a
token
of class
result
is returned, via
call defined function,
to the
phrase-evaluator
that called it.The returned
token
may be
constant
(for functions returning a value),
nil
(for functions that return no value),
unwind
(for functions that end through the evaluation of an escape arrow), or
reset
(as the result of an )
SIC
command).If a line in a
defined-function
signals an error,
immediate-execution
is called to report the error and suspend the
defined-function.
Immediate-execution
may return either a
branch
to indicate that evaluation of the
defined-function
should continue, or an
escape
or
reset
to indicate that the
defined-function context
should be removed from the
state-indicator.
Title: Defined functions
Description:
Algorithms written in APL are called defined functions.
A defined function consists of a header line and zero or more body lines.
The header line indicates the name and syntax class of the function and gives a list of names to be localised and, in the case of argument names, initialised.
Each body line consists of an optional label followed by an APL line to be evaluated.
Body lines are evaluated in the order in which they occur in the defined function unless a statement beginning with a right arrow is evaluated.
A defined function is established in a workspace by the system function □
FX,
by actions in function definition mode, or by the system command )
COPY.
In this standard, a
defined-function
is represented as an object with three attributes:
canonical-representation,
trace-vector,
and
stop-vector.
A
defined-function
is called when its
name
occurs in a
prefix
of the
current-stack
matching one of the
patterns
in the
phrase-table.
A
defined-function
is called by the operation
call defined function.
This operation prefixes the
state-indicator
with a new
context,
localises and initialises any local names in the
header-line,
and calls the operation
defined-function-control.
A
defined-function
ends when
defined-function-control
finds
current-line-number
set to a value not in the
closed-interval-between one
and
last-line-number.
At this point, the first
item
of the
state-indicator
is discarded and a
token
of class
result
is returned, via
call defined function,
to the
phrase-evaluator
that called it.
The returned
token
may be
constant
(for functions returning a value),
nil
(for functions that return no value),
unwind
(for functions that end through the evaluation of an escape arrow), or
reset
(as the result of an )
SIC
command).
If a line in a
defined-function
signals an error,
immediate-execution
is called to report the error and suspend the
defined-function.
Immediate-execution
may return either a
branch
to indicate that evaluation of the
defined-function
should continue, or an
escape
or
reset
to indicate that the
defined-function context
should be removed from the
state-indicator.
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