Words by Category: Flow Control Words

Words in category Flow Control Words in glossary TurboForth Kernal

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The following words are listed in this category (27 words found):

Word Types: S = Standard, I = Immediate , IC = Immediate-compiling.

Word Name	Word Type	Data Stack Signature	Return Stack Signature	Description	Availability
Word Name	Word Type	Data Stack Signature	Return Stack Signature	Description	V1.0	V1.1	V1.2
(+LOOP)	S	n --	-- ret_addr max index \| --	Internal assembly-code representation of +LOOP. Compiled by +LOOP.
(DO)	S	max index --	-- ret_addr max index	Internal assembly-code representation of DO. Compiled by DO.
(FOR)	S	count --	-- ret_addr max index	Internal assembly-code representation of FOR. Compiled by FOR.
(LOOP)	S	--	-- ret_addr max index \| --	Internal assembly-code represenation of LOOP. Compiled by LOOP.
(NEXT)	S	--	-- ret_addr max index \| --	Compiled into a definition by NEXT. Cause the loop index to be evaluated against zero, and the loop to be repeated if the index is not 0.
+LOOP	IC	n --	--	Adds n to the current loop index. If the index equals or exceeds the loop limit, the loop exits, otherwise the loop executes again.
0BRANCH	S	flag --	--	Branches to the address specified in the following cell if flag is `FALSE`, otherwise takes no action.
AGAIN	IC	--	--	Loops back unconditionally to associated `BEGIN`.
BEGIN	I	--	--	Marks the beginning of a `BEGIN`...`WHILE`...`REPEAT` loop or a `BEGIN`...`UNTIL` loop.
BRANCH	S	--	--	Branches unconditionally to the address in the following cell.
CASE	I	--	--	Marks the beginning of case-by-case processing.
DO	IC	max start --	--	Begins a `DO`/`LOOP` or a `DO`/`+LOOP` sequence.
ELSE	IC	--	--	Words following `ELSE` will be executed if the parent `IF` clause evaluates to `FALSE`.
ENDCASE	IC	--	--	Ends case-by-case processing. See `CASE`.
ENDOF	IC	--	--	Marks the end of a particular test case. See `CASE`.
FOR	IC	count --	--	Begins a `FOR`/`NEXT` loop.
I	S	-- index	--	Returns the current index in a `DO`/`LOOP` or `FOR`/`NEXT` loop.
IF	IC	flag --	--	Executes the words following `IF` if flag evaluates to `TRUE`. Starts an `IF`...`ELSE`...`THEN` clause.
J	S	-- index	--	Returns the outer index when used in a nested `DO` or `FOR` loop.
LEAVE	S	--	ret_add max index --	In a `DO`/`LOOP` or `FOR`/`NEXT` loop, causes the loop to exit. `LEAVE` should be used inside an `IF`...`THEN` block.
LOOP	IC	--	ret_add max index --ret_add index \| --	Causes a `DO`/`LOOP` to repeat from the word immediately following `DO`.
NEXT	IC	--	--	Causes a `FOR`/`NEXT` loop to repeat from the word following `FOR`.
OF	IC	--	--	Marks the beginning of a case test. See `CASE`.
REPEAT	IC	--	--	Loops back unconditionally to associated `BEGIN`.
THEN	IC	--	--	Marks the end of an `IF`...`ELSE`...`THEN` construct.
UNTIL	IC	flag --	--	Jumps back to associated `BEGIN` if flag evaluates to `FALSE`. I.e the loop exits if flag is `TRUE`.
WHILE	IC	flag --	--	Enters a `WHILE`/`REPEAT` block if flag evaluates to `TRUE`.