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new primitive: cons?

This commit is contained in:
Kartik K. Agaram 2021-07-03 16:16:03 -07:00
parent 810d9a26f5
commit d986404ff0
1 changed files with 42 additions and 1 deletions
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43
shell/primitives.mu
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@ -26,6 +26,7 @@ fn initialize-primitives _self: (addr global-table) {
append-primitive self, "car"
append-primitive self, "cdr"
append-primitive self, "cons"
append-primitive self, "cons?"
# for screens
append-primitive self, "print"
append-primitive self, "clear"
@ -74,7 +75,7 @@ fn render-primitives screen: (addr screen), xmin: int, xmax: int, ymax: int {
draw-text-wrapping-right-then-down-from-cursor screen, "lists", right-min, y, xmax, ymax, 7/fg=grey, 0xdc/bg=green-bg
y <- increment
set-cursor-position screen, right-min, y
draw-text-wrapping-right-then-down-from-cursor screen, "cons car cdr no", right-min, y, xmax, ymax, 0x2a/fg=orange, 0xdc/bg=green-bg
draw-text-wrapping-right-then-down-from-cursor screen, "cons car cdr no cons?", right-min, y, xmax, ymax, 0x2a/fg=orange, 0xdc/bg=green-bg
y <- increment
set-cursor-position screen, right-min, y
draw-text-wrapping-right-then-down-from-cursor screen, "numbers", right-min, y, xmax, ymax, 7/fg=grey, 0xdc/bg=green-bg
@ -292,6 +293,13 @@ fn apply-primitive _f: (addr cell), args-ah: (addr handle cell), out: (addr hand
apply-cons args-ah, out, trace
return
}
{
var cons-check?/eax: boolean <- string-equal? f-name, "cons?"
compare cons-check?, 0/false
break-if-=
apply-cons-check args-ah, out, trace
return
}
{
var structurally-equal?/eax: boolean <- string-equal? f-name, "="
compare structurally-equal?, 0/false
@ -1070,6 +1078,39 @@ fn apply-cons _args-ah: (addr handle cell), out: (addr handle cell), trace: (add
new-pair out, *first-ah, *second-ah
}
fn apply-cons-check _args-ah: (addr handle cell), out: (addr handle cell), trace: (addr trace) {
trace-text trace, "eval", "apply cons?"
var args-ah/eax: (addr handle cell) <- copy _args-ah
var _args/eax: (addr cell) <- lookup *args-ah
var args/esi: (addr cell) <- copy _args
{
var args-type/ecx: (addr int) <- get args, type
compare *args-type, 0/pair
break-if-=
error trace, "args to cons? are not a list"
return
}
var empty-args?/eax: boolean <- nil? args
compare empty-args?, 0/false
{
break-if-=
error trace, "cons? needs 1 arg but got 0"
return
}
# args->left
var first-ah/edx: (addr handle cell) <- get args, left
var first/eax: (addr cell) <- lookup *first-ah
var first-type/ecx: (addr int) <- get first, type
compare *first-type, 0/pair
{
break-if-=
nil out
return
}
new-integer out, 1
}
fn apply-structurally-equal _args-ah: (addr handle cell), out: (addr handle cell), trace: (addr trace) {
trace-text trace, "eval", "apply '='"
var args-ah/eax: (addr handle cell) <- copy _args-ah