STACKS
Section: Miscellaneous Library Functions (3X)
Updated: August 1, 1990
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NAME
stacks - vector representation of stacks
SYNOPSIS
#include stacks.f83
stacks
DESCRIPTION
Library for stacks represented as a vector. This library allows definition
and manipulation of "cell" width stacks. Provides functions for overflow
and empty checking. Applications are required to check stack consistency
with these functions.
- : .stack ( stack -- )
-
Displays the contents of a stack in the following form:
stack#
<stack-address>
[
<stack-depth>
] /
<top>
/ ... /
<bottom>
- : ?empty-stack ( stack -- bool)
-
Returns "true" if the stack is empty else "false".
- : ?full-stack ( stack -- bool)
-
Returns "true" if the stack is full else "false".
- : ?map-stack ( stack block[element -- bool] -- )
-
Conditional iterator for stacks. The parameter conditional block
on each element on the stack starting with the top of stack and
preceding towards the bottom of the stack. The conditional block
should return a boolean flag for each call. The iterator is terminated
when the block returns "true".
- struct.type STACK ( size -- )
-
Used in the following form:
<size>
STACK
<stack-name>
( -- stack)
to create a stack variable. May also be used to create a unnamed stack
instance with the "structures" library function "new-struct". In this
case include the "structures" library and use the following form:
<size>
new-struct STACK ( -- stack)
The top of stack pointer is stored first in the "STACK" structure.
<stack>
@ @ ( -- element)
This allows the top of stack element to be accessed indirectly through
the stack variable. This action will copy the top of the stack to
the forth parameter stack and not effect the internal stack pointers.
- : depth-stack ( stack -- num)
-
Returns the stack depth. The return value represents the number of
"pop" call that may be performed before the stack is empty.
- : empty-stack ( stack -- )
-
Removes all elements from the stack by putting the stack top to be the
stack bottom. The stack depth becomes zero and the stack becomes empty.
- : map-stack ( stack block[element -- ] -- )
-
Stack iterator function. Calls the parameter block for each element
in the stack starting with the top of stack and continues towards the
bottom of the stack.
- : pop ( stack -- element)
-
Removes the top element for the stack and returns this value. This
function will not check if the stack is empty. Applying this function
on an empty stack will leave the stack in an error state.
- : push ( element stack -- )
-
Appends the element to the top of the stack. This function will not
check if the stack is full. Applying this function on an empty stack will
leave the stack in an error state.
- : size-stack ( stack -- num)
-
Return the maximum number of elements that the stack can contain.
- vocabulary stacks ( -- )
-
Vocabulary containing the stack extensions. Include into the vocabulary
search structure, "context", to allow access of this library.
INTERNALS
Private definitions in the
stacks
vocabulary;
- ptr +top ( stack -- addr) private
-
Access field in "STACK" structure to pointer to top of stack.
- long +bytes ( stack -- addr) private
-
Access field in "STACK" structure to size of stack area in bytes.
The total size of a stack in bytes is the sum of the "STACK"
structure and this field. The size of the "STACK" header may be
accessed with the function "sizeof" in the "structures" library.
- ptr +bottom ( stack --- addr) private
-
Access field in "STACK" structure to pointer to bottom of stack.
SEE ALSO
tile(1),
forth(3X),
structures(3X),
blocks(3X).
NOTE
The function list is sorted in ASCII order. The type and mode of
the entries are indicated together with their parameter stack effect.
COPYING
Copyright (C) 1990 Mikael R.K. Patel
Permission is granted to make and distribute verbatim copies
of this manual provided the copyright notice and this permission
notice are preserved on all copies.
Permission is granted to copy and distribute modified versions
of this manual under the conditions for verbatim copying,
provided also that the section entitled "GNU General Public
License" is included exactly as in the original, and provided
that the entire resulting derived work is distributed under
the terms of a permission notice identical to this one.
Permission is granted to copy and distribute translations of
this manual into another language, under the above conditions
for modified versions, except that the section entitled "GNU
General Public License" may be included in a translation approved
by the author instead of in the original English.
AUTHOR
Mikael R.K. Patel
Computer Aided Design Laboratory (CADLAB)
Department of Computer and Information Science
Linkoping University
S-581 83 LINKOPING
SWEDEN
Email: mip@ida.liu.se
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- INTERNALS
-
- SEE ALSO
-
- NOTE
-
- COPYING
-
- AUTHOR
-
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