d1c1221822
'default-scope' is now 'default-space' 'closure-generator' is now 'next-space-generator' The connection to high-level syntax for closures is now tenuous, so we'll call the 'outer scope' the 'next space'. So, let's try to create a few sentences with all these related ideas: Names map to addresses offset from a default-space when it's provided. Spaces can be strung together. The zeroth variable points to the next space, the one that is accessed when a variable has /space:1. To map a name to an address in the next space, you need to know what function generated that space. A corollary is that the space passed in to a function should always be generated by a single function. Spaces can be used to construct lexical scopes and objects.
19 lines
813 B
Plaintext
19 lines
813 B
Plaintext
; a screen is an array of pointers to lines, in turn arrays of characters
|
|
|
|
(function new-screen [
|
|
(default-space:space-address <- new space:literal 30:literal)
|
|
(nrows:integer <- next-input)
|
|
(ncols:integer <- next-input)
|
|
(result:screen-address <- new screen:literal nrows:integer)
|
|
(rowidx:integer <- copy 0:literal)
|
|
{ begin
|
|
(curr-line-address-address:line-address-address <- index-address result:screen-address/deref rowidx:integer)
|
|
(curr-line-address-address:line-address-address/deref <- new line:literal ncols:integer)
|
|
(curr-line-address:line-address <- copy curr-line-address-address:line-address-address/deref)
|
|
(rowidx:integer <- add rowidx:integer 1:literal)
|
|
(x:boolean <- not-equal rowidx:integer nrows:integer)
|
|
(loop-if x:boolean)
|
|
}
|
|
(reply result:screen-address)
|
|
])
|