# A table is like an array, except that its keys are not integers but
# arbitrary types.
scenario table-read-write [
run [
1:address:shared:table:number:number <- new-table 30
put 1:address:shared:table:number:number, 12, 34
2:number <- index 1:address:shared:table:number:number, 12
]
memory-should-contain [
2 <- 34
]
]
container table:_key:_value [
length:number
capacity:number
data:address:shared:array:table_row:_key:_value
]
container table_row:_key:_value [
occupied?:boolean
key:_key
value:_value
]
recipe new-table capacity:number -> result:address:shared:table:_key:_value [
local-scope
load-ingredients
result <- new {(table _key _value): type}
tmp:address:number <- get-address *result, capacity:offset
*tmp <- copy capacity
data:address:address:shared:array:table_row:_key:_value <- get-address *result, data:offset
*data <- new {(table_row _key _value): type}, capacity
]
recipe put table:address:shared:table:_key:_value, key:_key, value:_value -> table:address:shared:table:_key:_value [
local-scope
load-ingredients
hash:number <- hash key
capacity:number <- get *table, capacity:offset
_, hash <- divide-with-remainder hash, capacity
table-data:address:shared:array:table_row:_key:_value <- get *table, data:offset
x:address:table_row:_key:_value <- index-address *table-data, hash
occupied?:boolean <- get *x, occupied?:offset
not-occupied?:boolean <- not occupied?:boolean
assert not-occupied?, [can't handle collisions yet]
*x <- merge 1/true, key, value
]
recipe index table:address:shared:table:_key:_value, key:_key -> result:_value [
local-scope
load-ingredients
hash:number <- hash key
capacity:number <- get *table, capacity:offset
_, hash <- divide-with-remainder hash, capacity
table-data:address:shared:array:table_row:_key:_value <- get *table, data:offset
x:table_row:_key:_value <- index *table-data, hash
occupied?:boolean <- get x, occupied?:offset
assert occupied?, [can't handle missing elements yet]
result <- get x, value:offset
]