1 # new type to help incrementally scan arrays
 2 container stream:_elem [
 3   index:num
 4   data:&:@:_elem
 5 ]
 6 
 7 def new-stream s:&:@:_elem -> result:&:stream:_elem [
 8   local-scope
 9   load-ingredients
10   result <- new {(stream _elem): type}
11   *result <- put *result, index:offset, 0
12   *result <- put *result, data:offset, s
13 ]
14 
15 def rewind in:&:stream:_elem -> in:&:stream:_elem [
16   local-scope
17   load-ingredients
18   *in <- put *in, index:offset, 0
19 ]
20 
21 def read in:&:stream:_elem -> result:_elem, empty?:bool, in:&:stream:_elem [
22   local-scope
23   load-ingredients
24   empty? <- copy 0/false
25   idx:num <- get *in, index:offset
26   s:&:@:_elem <- get *in, data:offset
27   len:num <- length *s
28   at-end?:bool <- greater-or-equal idx len
29   {
30   ¦ break-unless at-end?
31   ¦ empty-result:&:_elem <- new _elem:type
32   ¦ return *empty-result, 1/true
33   }
34   result <- index *s, idx
35   idx <- add idx, 1
36   *in <- put *in, index:offset, idx
37 ]
38 
39 def peek in:&:stream:_elem -> result:_elem, empty?:bool [
40   local-scope
41   load-ingredients
42   empty?:bool <- copy 0/false
43   idx:num <- get *in, index:offset
44   s:&:@:_elem <- get *in, data:offset
45   len:num <- length *s
46   at-end?:bool <- greater-or-equal idx len
47   {
48   ¦ break-unless at-end?
49   ¦ empty-result:&:_elem <- new _elem:type
50   ¦ return *empty-result, 1/true
51   }
52   result <- index *s, idx
53 ]
54 
55 def read-line in:&:stream:char -> result:text, in:&:stream:char [
56   local-scope
57   load-ingredients
58   idx:num <- get *in, index:offset
59   s:text <- get *in, data:offset
60   next-idx:num <- find-next s, 10/newline, idx
61   result <- copy-range s, idx, next-idx
62   idx <- add next-idx, 1  # skip newline
63   # write back
64   *in <- put *in, index:offset, idx
65 ]
66 
67 def end-of-stream? in:&:stream:_elem -> result:bool [
68   local-scope
69   load-ingredients
70   idx:num <- get *in, index:offset
71   s:&:@:_elem <- get *in, data:offset
72   len:num <- length *s
73   result <- greater-or-equal idx, len
74 ]