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# Wrappers around print primitives that take a 'screen' object and are thus
# easier to test.
container screen [
num-rows:integer
num-columns:integer
cursor-row:integer
cursor-column:integer
data:address:array:character
]
recipe init-fake-screen [
default-space:address:array:location <- new location:type, 30:literal/capacity
result:address:screen <- new screen:type
width:address:integer <- get-address result:address:screen/deref, num-columns:offset
width:address:integer/deref <- next-ingredient
height:address:integer <- get-address result:address:screen/deref, num-rows:offset
height:address:integer/deref <- next-ingredient
row:address:integer <- get-address result:address:screen/deref, cursor-row:offset
row:address:integer/deref <- copy 0:literal
column:address:integer <- get-address result:address:screen/deref, cursor-column:offset
column:address:integer/deref <- copy 0:literal
bufsize:integer <- multiply width:address:integer/deref, height:address:integer/deref
buf:address:address:array:character <- get-address result:address:screen/deref, data:offset
buf:address:address:array:character/deref <- new character:literal, bufsize:integer
clear-screen result:address:screen
reply result:address:screen
]
recipe clear-screen [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists
{
break-unless x:address:screen
# clear fake screen
buf:address:array:character <- get x:address:screen/deref, data:offset
max:integer <- length buf:address:array:character/deref
i:integer <- copy 0:literal
{
done?:boolean <- greater-or-equal i:integer, max:integer
break-if done?:boolean
c:address:character <- index-address buf:address:array:character/deref, i:integer
c:address:character/deref <- copy [ ]
i:integer <- add i:integer, 1:literal
loop
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
clear-display
reply x:address:screen/same-as-ingredient:0
]
recipe print-character [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
c:character <- next-ingredient
#? $print x:address:character #? 1
#? $print [ print-character #? 1
#? ] #? 1
{
# if x exists
break-unless x:address:screen
#? $print [print-character2 #? 1
#? ] #? 1
# save character in fake screen
row:address:integer <- get-address x:address:screen/deref, cursor-row:offset
column:address:integer <- get-address x:address:screen/deref, cursor-column:offset
width:integer <- get x:address:screen/deref, num-columns:offset
index:integer <- multiply row:address:integer/deref, width:integer
index:integer <- add index:integer, column:address:integer/deref
buf:address:array:character <- get x:address:screen/deref, data:offset
cursor:address:character <- index-address buf:address:array:character/deref, index:integer
#? $print cursor:address:character #? 1
#? $print [ #? 1
#? ] #? 1
cursor:address:character/deref <- copy c:character # todo: newline, etc.
# increment column unless it's already all the way to the right
{
at-right?:boolean <- equal column:address:integer/deref, width:integer
break-if at-right?:boolean
column:address:integer/deref <- add column:address:integer/deref, 1:literal
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
print-character-to-display c:character
reply x:address:screen/same-as-ingredient:0
]
scenario print-character-at-top-left [
run [
#? $start-tracing #? 3
1:address:screen <- init-fake-screen 3:literal/width, 2:literal/height
1:address:screen <- print-character 1:address:screen, 97:literal # 'a'
2:address:array:character <- get 1:address:screen/deref, data:offset
3:array:character <- copy 2:address:array:character/deref
]
memory-should-contain [
3 <- 6 # width*height
4 <- 97 # 'a'
5 <- 0
]
]
recipe clear-line [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, clear line in fake screen
{
break-unless x:address:screen
n:integer <- get x:address:screen/deref, num-columns:offset
column:address:integer <- get-address x:address:screen/deref, cursor-column:offset
original-column:integer <- copy column:address:integer/deref
# space over the entire line
{
done?:boolean <- greater-or-equal column:address:integer/deref, n:integer
break-if done?:boolean
print-character x:address:screen, [ ] # implicitly updates 'column'
loop
}
# now back to where the cursor was
column:address:integer/deref <- copy original-column:integer
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
clear-line-on-display
reply x:address:screen/same-as-ingredient:0
]
recipe cursor-position [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, lookup cursor in fake screen
{
break-unless x:address:screen
row:integer <- get x:address:screen/deref, cursor-row:offset
column:integer <- get x:address:screen/deref, cursor-column:offset
reply row:integer, column:integer
}
row:integer, column:integer <- cursor-position-on-display
reply row:integer, column:integer
]
recipe move-cursor [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
new-row:integer <- next-ingredient
new-column:integer <- next-ingredient
# if x exists, move cursor in fake screen
{
break-unless x:address:screen
row:address:integer <- get-address x:address:screen/deref cursor-row:offset
row:address:integer/deref <- copy new-row:integer
column:address:integer <- get-address x:address:screen/deref cursor-column:offset
column:address:integer/deref <- copy new-column:integer
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
move-cursor-on-display new-row:integer, new-column:integer
reply x:address:screen/same-as-ingredient:0
]
scenario clear-line-erases-printed-characters [
run [
#? $start-tracing #? 3
1:address:screen <- init-fake-screen 3:literal/width, 2:literal/height
# print a character
1:address:screen <- print-character 1:address:screen, 97:literal # 'a'
# move cursor to start of line
1:address:screen <- move-cursor 1:address:screen, 0:literal/row, 0:literal/column
# clear line
1:address:screen <- clear-line 1:address:screen
2:address:array:character <- get 1:address:screen/deref, data:offset
3:array:character <- copy 2:address:array:character/deref
]
# screen should be blank
memory-should-contain [
3 <- 6 # width*height
4 <- 0
5 <- 0
6 <- 0
7 <- 0
8 <- 0
9 <- 0
]
]
recipe cursor-down [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, move cursor in fake screen
{
break-unless x:address:screen
{
# if row < height
height:integer <- get x:address:screen/deref, num-rows:offset
row:address:integer <- get-address x:address:screen/deref cursor-row:offset
at-bottom?:boolean <- greater-or-equal row:address:integer/deref, height:integer
break-if at-bottom?:boolean
# row = row+1
row:address:integer/deref <- add row:address:integer, 1:literal
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
move-cursor-down-on-display
reply x:address:screen/same-as-ingredient:0
]
recipe cursor-up [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, move cursor in fake screen
{
break-unless x:address:screen
{
# if row >= 0
row:address:integer <- get-address x:address:screen/deref cursor-row:offset
at-top?:boolean <- lesser-than row:address:integer/deref, 0:literal
break-if at-top?:boolean
# row = row-1
row:address:integer/deref <- subtract row:address:integer, 1:literal
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
move-cursor-up-on-display
reply x:address:screen/same-as-ingredient:0
]
recipe cursor-right [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, move cursor in fake screen
{
break-unless x:address:screen
{
# if column < width
width:integer <- get x:address:screen/deref, num-columns:offset
column:address:integer <- get-address x:address:screen/deref cursor-column:offset
at-bottom?:boolean <- greater-or-equal column:address:integer/deref, width:integer
break-if at-bottom?:boolean
# column = column+1
column:address:integer/deref <- add column:address:integer, 1:literal
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
move-cursor-right-on-display
reply x:address:screen/same-as-ingredient:0
]
recipe cursor-left [
default-space:address:array:location <- new location:type, 30:literal
x:address:screen <- next-ingredient
# if x exists, move cursor in fake screen
{
break-unless x:address:screen
{
# if column >= 0
column:address:integer <- get-address x:address:screen/deref cursor-column:offset
at-top?:boolean <- lesser-than column:address:integer/deref, 0:literal
break-if at-top?:boolean
# column = column-1
column:address:integer/deref <- subtract column:address:integer, 1:literal
}
reply x:address:screen/same-as-ingredient:0
}
# otherwise, real screen
move-cursor-left-on-display
reply x:address:screen/same-as-ingredient:0
]
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