Code Instructions

This page introduces instructions for :code and :exec.

codemaker

Codemaker pops an item from a specific stack and push it into the code stack. Codemaker is a high level function which is used to construct push instructions code_fromboolean, code_fromfloat, code_frominteger and code-quote, which moves an item from :exec to :code.

Stack manipulations

Instruction	Explanation	input	output
code_append	Append the first 2 items in :code	:code	:code
code_atom	If the first item in :code is a sequence → false, otherwise true	:code	:boolean
code_car	Perform first on the first item of :code	:code	:code
code_cdr	Perform rest on the first item of :code	:code	:code
code_cons	Concatenate the second item of :code into the first one	:code	:code
code_wrap	Wrap up the first item of :code with (list )	:code	:code
code_list	List the first two items of :code	:code	:code
code_length	Get the length of the first item of :code	:code	:code
code_map	Maps the first item of :code and the first item in :exec	:code, :exec	:code
code_member	Whether the second item in :code belongs to the first item of :code or not	:code	:boolean
code_nth	Get the nth (mod the length of code) from a piece of code	:code, :integer	:code
code_nthcdr	Delete all instructions before the nth (mod the length of code)	:code, :integer	:code
code_null	Determine whether the first item in :code is an empty sequence or not	:code	:boolean
code_extract	Use code-at-a-point to return a subtree of the first item from :code	:code, :integer	:code
code_insert	Insert a piece of code into another by insert-code-at-a-point	:code, :integer	:code
code_subst	To name the first, second and third items from :code 1, 2 and 3. Replace all 3 in 1 with 2.	:code	:code
code_contains	Exam whether the second code item contains the first one as its subtree or not	:code	:boolean
code_containing	Returns the smallest subtree of the first item which contains the second item.	:code	:code
code_position	Get the position in which the second code item appears in the first one. -1 if no appearance is found.	:code	:integer

Execute codes

instruction	explanation
code_do	execute the code (by pushing both it and code_popper to :exec)
code_do*	execute the code (by popping it and pushing to :exec)
code_do*range	While the counter moves from the second item of :integer to the first item of :integer by 1 (+ or -), keep executing the first item of :code
exec_do*range	similar to code_do*range but the source is from :exec
code_do*count	Execute the first item of :code for (the first item of :integer) times
exec_do*count	similar to code_do*count but the source if from :exec
code_if	If the first item in :boolean is true, run the second item of :code, otherwise run the first one
exec_if	true → run the fist one from :exec, false → run the second one
exec_when	first item from :boolean is true → pop :boolean, otherwise pop both :boolean and :exec. To understand: if true, it would be executed later at some point.