# Some useful helpers for dealing with strings.
recipe string-equal a:address:array:character, b:address:array:character -> result:boolean [
local-scope
load-ingredients
a-len:number <- length *a
b-len:number <- length *b
# compare lengths
{
trace 99, [string-equal], [comparing lengths]
length-equal?:boolean <- equal a-len, b-len
break-if length-equal?
reply 0
}
# compare each corresponding character
trace 99, [string-equal], [comparing characters]
i:number <- copy 0
{
done?:boolean <- greater-or-equal i, a-len
break-if done?
a2:character <- index *a, i
b2:character <- index *b, i
{
chars-match?:boolean <- equal a2, b2
break-if chars-match?
reply 0
}
i <- add i, 1
loop
}
reply 1
]
scenario string-equal-reflexive [
run [
default-space:address:array:location <- new location:type, 30
x:address:array:character <- new [abc]
3:boolean/raw <- string-equal x, x
]
memory-should-contain [
3 <- 1 # x == x for all x
]
]
scenario string-equal-identical [
run [
default-space:address:array:location <- new location:type, 30
x:address:array:character <- new [abc]
y:address:array:character <- new [abc]
3:boolean/raw <- string-equal x, y
]
memory-should-contain [
3 <- 1 # abc == abc
]
]
scenario string-equal-distinct-lengths [
run [
default-space:address:array:location <- new location:type, 30
x:address:array:character <- new [abc]
y:address:array:character <- new [abcd]
3:boolean/raw <- string-equal x, y
]
memory-should-contain [
3 <- 0 # abc != abcd
]
trace-should-contain [
string-equal: comparing lengths
]
trace-should-not-contain [
string-equal: comparing characters
]
]
scenario string-equal-with-empty [
run [
default-space:address:array:location <- new location:type, 30
x:address:array:character <- new []
y:address:array:character <- new [abcd]
3:boolean/raw <- string-equal x, y
]
memory-should-contain [
3 <- 0 # "" != abcd
]
]
scenario string-equal-common-lengths-but-distinct [
run [
default-space:address:array:location <- new location:type, 30
x:address:array:character <- new [abc]
y:address:array:character <- new [abd]
3:boolean/raw <- string-equal x, y
]
memory-should-contain [
3 <- 0 # abc != abd
]
]
# A new type to help incrementally construct strings.
container buffer [
length:number
data:address:array:character
]
recipe new-buffer capacity:number -> result:address:buffer [
local-scope
load-ingredients
result <- new buffer:type
len:address:number <- get-address *result, length:offset
*len:address:number <- copy 0
s:address:address:array:character <- get-address *result, data:offset
*s <- new character:type, capacity
reply result
]
recipe grow-buffer in:address:buffer -> in:address:buffer [
local-scope
load-ingredients
# double buffer size
x:address:address:array:character <- get-address *in, data:offset
oldlen:number <- length **x
newlen:number <- multiply oldlen, 2
olddata:address:array:character <- copy *x
*x <- new character:type, newlen
# copy old contents
i:number <- copy 0
{
done?:boolean <- greater-or-equal i, oldlen
break-if done?
src:character <- index *olddata, i
dest:address:character <- index-address **x, i
*dest <- copy src
i <- add i, 1
loop
}
]
recipe buffer-full? in:address:buffer -> result:boolean [
local-scope
load-ingredients
len:number <- get *in, length:offset
s:address:array:character <- get *in, data:offset
capacity:number <- length *s
result <- greater-or-equal len, capacity
]
recipe buffer-append in:address:buffer, c:character -> in:address:buffer [
local-scope
load-ingredients
len:address:number <- get-address *in, length:offset
{
# backspace? just drop last character if it exists and return
backspace?:boolean <- equal c, 8/backspace
break-unless backspace?
empty?:boolean <- lesser-or-equal *len, 0
reply-if empty?
*len <- subtract *len, 1
reply
}
{
# grow buffer if necessary
full?:boolean <- buffer-full? in
break-unless full?
in <- grow-buffer in
}
s:address:array:character <- get *in, data:offset
dest:address:character <- index-address *s, *len
*dest <- copy c
*len <- add *len, 1
]
scenario buffer-append-works [
run [
local-scope
x:address:buffer <- new-buffer 3
s1:address:array:character <- get *x:address:buffer, data:offset
x:address:buffer <- buffer-append x:address:buffer, 97 # 'a'
x:address:buffer <- buffer-append x:address:buffer, 98 # 'b'
x:address:buffer <- buffer-append x:address:buffer, 99 # 'c'
s2:address:array:character <- get *x:address:buffer, data:offset
1:boolean/raw <- equal s1:address:array:character, s2:address:array:character
2:array:character/raw <- copy *s2:address:array:character
+buffer-filled
x:address:buffer <- buffer-append x:address:buffer, 100 # 'd'
s3:address:array:character <- get *x:address:buffer, data:offset
10:boolean/raw <- equal s1:address:array:character, s3:address:array:character
11:number/raw <- get *x:address:buffer, length:offset
12:array:character/raw <- copy *s3:address:array:character
]
memory-should-contain [
# before +buffer-filled
1 <- 1 # no change in data pointer
2 <- 3 # size of data
3 <- 97 # data
4 <- 98
5 <- 99
# in the end
10 <- 0 # data pointer has grown
11 <- 4 # final length
12 <- 6 # but data's capacity has doubled
13 <- 97 # data
14 <- 98
15 <- 99
16 <- 100
17 <- 0
18 <- 0
]
]
scenario buffer-append-handles-backspace [
run [
local-scope
x:address:buffer <- new-buffer 3
x <- buffer-append x, 97 # 'a'
x <- buffer-append x, 98 # 'b'
x <- buffer-append x, 8/backspace
s:address:array:character <- buffer-to-array x
1:array:character/raw <- copy *s
]
memory-should-contain [
1 <- 1 # length
2 <- 97 # contents
3 <- 0
]
]
# result:address:array:character <- integer-to-decimal-string n:number
recipe integer-to-decimal-string n:number -> result:address:array:character [
local-scope
load-ingredients
# is n zero?
{
break-if n
result <- new [0]
reply
}
# save sign
negate-result:boolean <- copy 0
{
negative?:boolean <- lesser-than n, 0
break-unless negative?
negate-result <- copy 1
n <- multiply n, -1
}
# add digits from right to left into intermediate buffer
tmp:address:buffer <- new-buffer 30
digit-base:number <- copy 48 # '0'
{
done?:boolean <- equal n, 0
break-if done?
n, digit:number <- divide-with-remainder n, 10
c:character <- add digit-base, digit
tmp:address:buffer <- buffer-append tmp, c
loop
}
# add sign
{
break-unless negate-result:boolean
tmp <- buffer-append tmp, 45 # '-'
}
# reverse buffer into string result
len:number <- get *tmp, length:offset
buf:address:array:character <- get *tmp, data:offset
result <- new character:type, len
i:number <- subtract len, 1 # source index, decreasing
j:number <- copy 0 # destination index, increasing
{
# while i >= 0
done?:boolean <- lesser-than i, 0
break-if done?
# result[j] = tmp[i]
src:character <- index *buf, i
dest:address:character <- index-address *result, j
*dest <- copy src
i <- subtract i, 1
j <- add j, 1
loop
}
]
recipe buffer-to-array in:address:buffer -> result:address:array:character [
local-scope
load-ingredients
{
# propagate null buffer
break-if in
reply 0
}
len:number <- get *in, length:offset
s:address:array:character <- get *in, data:offset
# we can't just return s because it is usually the wrong length
result <- new character:type, len
i:number <- copy 0
{
done?:boolean <- greater-or-equal i, len
break-if done?
src:character <- index *s, i
dest:address:character <- index-address *result, i
*dest <- copy src
i <- add i, 1
loop
}
]
scenario integer-to-decimal-digit-zero [
run [
1:address:array:character/raw <- integer-to-decimal-string 0
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [0]
]
]
scenario integer-to-decimal-digit-positive [
run [
1:address:array:character/raw <- integer-to-decimal-string 234
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [234]
]
]
scenario integer-to-decimal-digit-negative [
run [
1:address:array:character/raw <- integer-to-decimal-string -1
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2 <- 2
3 <- 45 # '-'
4 <- 49 # '1'
]
]
recipe string-append a:address:array:character, b:address:array:character -> result:address:array:character [
local-scope
load-ingredients
# result = new character[a.length + b.length]
a-len:number <- length *a
b-len:number <- length *b
result-len:number <- add a-len, b-len
result <- new character:type, result-len
# copy a into result
result-idx:number <- copy 0
i:number <- copy 0
{
# while i < a.length
a-done?:boolean <- greater-or-equal i, a-len
break-if a-done?
# result[result-idx] = a[i]
out:address:character <- index-address *result, result-idx
in:character <- index *a, i
*out <- copy in
i <- add i, 1
result-idx <- add result-idx, 1
loop
}
# copy b into result
i <- copy 0
{
# while i < b.length
b-done?:boolean <- greater-or-equal i, b-len
break-if b-done?
# result[result-idx] = a[i]
out:address:character <- index-address *result, result-idx
in:character <- index *b, i
*out <- copy in
i <- add i, 1
result-idx <- add result-idx, 1
loop
}
]
scenario string-append-1 [
run [
1:address:array:character/raw <- new [hello,]
2:address:array:character/raw <- new [ world!]
3:address:array:character/raw <- string-append 1:address:array:character/raw, 2:address:array:character/raw
4:array:character/raw <- copy *3:address:array:character/raw
]
memory-should-contain [
4:string <- [hello, world!]
]
]
scenario replace-character-in-string [
run [
1:address:array:character/raw <- new [abc]
1:address:array:character/raw <- string-replace 1:address:array:character/raw, 98/b, 122/z
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [azc]
]
]
recipe string-replace s:address:array:character, oldc:character, newc:character -> s:address:array:character [
local-scope
load-ingredients
from:number, _ <- next-ingredient # default to 0
len:number <- length *s
i:number <- find-next s, oldc, from
done?:boolean <- greater-or-equal i, len
reply-if done?, s/same-as-ingredient:0
dest:address:character <- index-address *s, i
*dest <- copy newc
i <- add i, 1
s <- string-replace s, oldc, newc, i
]
scenario replace-character-at-start [
run [
1:address:array:character/raw <- new [abc]
1:address:array:character/raw <- string-replace 1:address:array:character/raw, 97/a, 122/z
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [zbc]
]
]
scenario replace-character-at-end [
run [
1:address:array:character/raw <- new [abc]
1:address:array:character/raw <- string-replace 1:address:array:character/raw, 99/c, 122/z
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [abz]
]
]
scenario replace-character-missing [
run [
1:address:array:character/raw <- new [abc]
1:address:array:character/raw <- string-replace 1:address:array:character/raw, 100/d, 122/z
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [abc]
]
]
scenario replace-all-characters [
run [
1:address:array:character/raw <- new [banana]
1:address:array:character/raw <- string-replace 1:address:array:character/raw, 97/a, 122/z
2:array:character/raw <- copy *1:address:array:character/raw
]
memory-should-contain [
2:string <- [bznznz]
]
]
# replace underscores in first with remaining args
recipe interpolate template:address:array:character -> result:address:array:character [
local-scope
load-ingredients # consume just the template
# compute result-len, space to allocate for result
tem-len:number <- length *template
result-len:number <- copy tem-len
{
# while ingredients remain
a:address:array:character, arg-received?:boolean <- next-ingredient
break-unless arg-received?
# result-len = result-len + arg.length - 1 (for the 'underscore' being replaced)
a-len:number <- length *a
result-len <- add result-len, a-len
result-len <- subtract result-len, 1
loop
}
rewind-ingredients
_ <- next-ingredient # skip template
result:address:array:character <- new character:type, result-len
# repeatedly copy sections of template and 'holes' into result
result-idx:number <- copy 0
i:number <- copy 0
{
# while arg received
a:address:array:character, arg-received?:boolean <- next-ingredient
break-unless arg-received?
# copy template into result until '_'
{
# while i < template.length
tem-done?:boolean <- greater-or-equal i, tem-len
break-if tem-done?, +done:label
# while template[i] != '_'
in:character <- index *template, i
underscore?:boolean <- equal in, 95/_
break-if underscore?
# result[result-idx] = template[i]
out:address:character <- index-address *result, result-idx
*out <- copy in
i <- add i, 1
result-idx <- add result-idx, 1
loop
}
# copy 'a' into result
j:number <- copy 0
{
# while j < a.length
arg-done?:boolean <- greater-or-equal j, a-len
break-if arg-done?
# result[result-idx] = a[j]
in:character <- index *a, j
out:address:character <- index-address *result, result-idx
*out <- copy in
j <- add j, 1
result-idx <- add result-idx, 1
loop
}
# skip '_' in template
i <- add i, 1
loop # interpolate next arg
}
+done
# done with holes; copy rest of template directly into result
{
# while i < template.length
tem-done?:boolean <- greater-or-equal i, tem-len
break-if tem-done?
# result[result-idx] = template[i]
in:character <- index *template, i
out:address:character <- index-address *result, result-idx:number
*out <- copy in
i <- add i, 1
result-idx <- add result-idx, 1
loop
}
]
scenario interpolate-works [
run [
1:address:array:character/raw <- new [abc _]
2:address:array:character/raw <- new [def]
3:address:array:character/raw <- interpolate 1:address:array:character/raw, 2:address:array:character/raw
4:array:character/raw <- copy *3:address:array:character/raw
]
memory-should-contain [
4:string <- [abc def]
]
]
scenario interpolate-at-start [
run [
1:address:array:character/raw <- new [_, hello!]
2:address:array:character/raw <- new [abc]
3:address:array:character/raw <- interpolate 1:address:array:character/raw, 2:address:array:character/raw
4:array:character/raw <- copy *3:address:array:character/raw
]
memory-should-contain [
4:string <- [abc, hello!]
16 <- 0 # out of bounds
]
]
scenario interpolate-at-end [
run [
1:address:array:character/raw <- new [hello, _]
2:address:array:character/raw <- new [abc]
3:address:array:character/raw <- interpolate 1:address:array:character/raw, 2:address:array:character/raw
4:array:character/raw <- copy *3:address:array:character/raw
]
memory-should-contain [
4:string <- [hello, abc]
]
]
# result:boolean <- space? c:character
recipe space? c:character -> result:boolean [
local-scope
load-ingredients
# most common case first
result <- equal c, 32/space
reply-if result
result <- equal c, 10/newline
reply-if result
result <- equal c, 9/tab
reply-if result
result <- equal c, 13/carriage-return
reply-if result
# remaining uncommon cases in sorted order
# http://unicode.org code-points in unicode-set Z and Pattern_White_Space
result <- equal c, 11/ctrl-k
reply-if result
result <- equal c, 12/ctrl-l
reply-if result
result <- equal c, 133/ctrl-0085
reply-if result
result <- equal c, 160/no-break-space
reply-if result
result <- equal c, 5760/ogham-space-mark
reply-if result
result <- equal c, 8192/en-quad
reply-if result
result <- equal c, 8193/em-quad
reply-if result
result <- equal c, 8194/en-space
reply-if result
result <- equal c, 8195/em-space
reply-if result
result <- equal c, 8196/three-per-em-space
reply-if result
result <- equal c, 8197/four-per-em-space
reply-if result
result <- equal c, 8198/six-per-em-space
reply-if result
result <- equal c, 8199/figure-space
reply-if result
result <- equal c, 8200/punctuation-space
reply-if result
result <- equal c, 8201/thin-space
reply-if result
result <- equal c, 8202/hair-space
reply-if result
result <- equal c, 8206/left-to-right
reply-if result
result <- equal c, 8207/right-to-left
reply-if result
result <- equal c, 8232/line-separator
reply-if result
result <- equal c, 8233/paragraph-separator
reply-if result
result <- equal c, 8239/narrow-no-break-space
reply-if result
result <- equal c, 8287/medium-mathematical-space
reply-if result
result <- equal c, 12288/ideographic-space
]
recipe trim s:address:array:character -> result:address:array:character [
local-scope
load-ingredients
len:number <- length *s
# left trim: compute start
start:number <- copy 0
{
{
at-end?:boolean <- greater-or-equal start, len
break-unless at-end?
result <- new character:type, 0
reply
}
curr:character <- index *s, start
whitespace?:boolean <- space? curr
break-unless whitespace?
start <- add start, 1
loop
}
# right trim: compute end
end:number <- subtract len, 1
{
not-at-start?:boolean <- greater-than end, start
assert not-at-start?, [end ran up against start]
curr:character <- index *s, end
whitespace?:boolean <- space? curr
break-unless whitespace?
end <- subtract end, 1
loop
}
# result = new character[end+1 - start]
new-len:number <- subtract end, start, -1
result:address:array:character <- new character:type, new-len
# copy the untrimmed parts between start and end
i:number <- copy start
j:number <- copy 0
{
# while i <= end
done?:boolean <- greater-than i, end
break-if done?
# result[j] = s[i]
src:character <- index *s, i
dest:address:character <- index-address *result, j
*dest <- copy src
i <- add i, 1
j <- add j, 1
loop
}
]
scenario trim-unmodified [
run [
1:address:array:character <- new [abc]
2:address:array:character <- trim 1:address:array:character
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [abc]
]
]
scenario trim-left [
run [
1:address:array:character <- new [ abc]
2:address:array:character <- trim 1:address:array:character
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [abc]
]
]
scenario trim-right [
run [
1:address:array:character <- new [abc ]
2:address:array:character <- trim 1:address:array:character
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [abc]
]
]
scenario trim-left-right [
run [
1:address:array:character <- new [ abc ]
2:address:array:character <- trim 1:address:array:character
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [abc]
]
]
scenario trim-newline-tab [
run [
1:address:array:character <- new [ abc
]
2:address:array:character <- trim 1:address:array:character
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [abc]
]
]
recipe find-next text:address:array:character, pattern:character, idx:number -> next-index:number [
local-scope
text:address:array:character <- next-ingredient
pattern:character <- next-ingredient
idx:number <- next-ingredient
len:number <- length *text
{
eof?:boolean <- greater-or-equal idx, len
break-if eof?
curr:character <- index *text, idx
found?:boolean <- equal curr, pattern
break-if found?
idx <- add idx, 1
loop
}
reply idx
]
scenario string-find-next [
run [
1:address:array:character <- new [a/b]
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 1
]
]
scenario string-find-next-empty [
run [
1:address:array:character <- new []
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 0
]
]
scenario string-find-next-initial [
run [
1:address:array:character <- new [/abc]
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 0 # prefix match
]
]
scenario string-find-next-final [
run [
1:address:array:character <- new [abc/]
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 3 # suffix match
]
]
scenario string-find-next-missing [
run [
1:address:array:character <- new [abc]
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 3 # no match
]
]
scenario string-find-next-invalid-index [
run [
1:address:array:character <- new [abc]
2:number <- find-next 1:address:array:character, 47/slash, 4/start-index
]
memory-should-contain [
2 <- 4 # no change
]
]
scenario string-find-next-first [
run [
1:address:array:character <- new [ab/c/]
2:number <- find-next 1:address:array:character, 47/slash, 0/start-index
]
memory-should-contain [
2 <- 2 # first '/' of multiple
]
]
scenario string-find-next-second [
run [
1:address:array:character <- new [ab/c/]
2:number <- find-next 1:address:array:character, 47/slash, 3/start-index
]
memory-should-contain [
2 <- 4 # second '/' of multiple
]
]
# like find-next, but searches for multiple characters
# fairly dumb algorithm
recipe find-substring text:address:array:character, pattern:address:array:character, idx:number -> next-idx:number [
local-scope
load-ingredients
first:character <- index *pattern, 0
# repeatedly check for match at current idx
len:number <- length *text
{
# does some unnecessary work checking for substrings even when there isn't enough of text left
done?:boolean <- greater-or-equal idx, len
break-if done?
found?:boolean <- match-at text, pattern, idx
break-if found?
idx <- add idx, 1
# optimization: skip past indices that definitely won't match
idx <- find-next text, first, idx
loop
}
reply idx
]
scenario find-substring-1 [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [bc]
3:number <- find-substring 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 1
]
]
scenario find-substring-2 [
run [
1:address:array:character <- new [abcd]
2:address:array:character <- new [bc]
3:number <- find-substring 1:address:array:character, 2:address:array:character, 1
]
memory-should-contain [
3 <- 1
]
]
scenario find-substring-no-match [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [bd]
3:number <- find-substring 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 3 # not found
]
]
scenario find-substring-suffix-match [
run [
1:address:array:character <- new [abcd]
2:address:array:character <- new [cd]
3:number <- find-substring 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 2
]
]
scenario find-substring-suffix-match-2 [
run [
1:address:array:character <- new [abcd]
2:address:array:character <- new [cde]
3:number <- find-substring 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 4 # not found
]
]
# checks if substring matches at index 'idx'
recipe match-at text:address:array:character, pattern:address:array:character, idx:number -> result:boolean [
local-scope
load-ingredients
pattern-len:number <- length *pattern
# check that there's space left for the pattern
{
x:number <- length *text
x <- subtract x, pattern-len
enough-room?:boolean <- lesser-or-equal idx, x
break-if enough-room?
reply 0/not-found
}
# check each character of pattern
pattern-idx:number <- copy 0
{
done?:boolean <- greater-or-equal pattern-idx, pattern-len
break-if done?
c:character <- index *text, idx
exp:character <- index *pattern, pattern-idx
{
match?:boolean <- equal c, exp
break-if match?
reply 0/not-found
}
idx <- add idx, 1
pattern-idx <- add pattern-idx, 1
loop
}
reply 1/found
]
scenario match-at-checks-substring-at-index [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [ab]
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 1 # match found
]
]
scenario match-at-reflexive [
run [
1:address:array:character <- new [abc]
3:boolean <- match-at 1:address:array:character, 1:address:array:character, 0
]
memory-should-contain [
3 <- 1 # match found
]
]
scenario match-at-outside-bounds [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [a]
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 4
]
memory-should-contain [
3 <- 0 # never matches
]
]
scenario match-at-empty-pattern [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new []
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 1 # always matches empty pattern given a valid index
]
]
scenario match-at-empty-pattern-outside-bound [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new []
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 4
]
memory-should-contain [
3 <- 0 # no match
]
]
scenario match-at-empty-text [
run [
1:address:array:character <- new []
2:address:array:character <- new [abc]
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 0 # no match
]
]
scenario match-at-empty-against-empty [
run [
1:address:array:character <- new []
3:boolean <- match-at 1:address:array:character, 1:address:array:character, 0
]
memory-should-contain [
3 <- 1 # matches because pattern is also empty
]
]
scenario match-at-inside-bounds [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [bc]
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 1
]
memory-should-contain [
3 <- 1 # matches inner substring
]
]
scenario match-at-inside-bounds-2 [
run [
1:address:array:character <- new [abc]
2:address:array:character <- new [bc]
3:boolean <- match-at 1:address:array:character, 2:address:array:character, 0
]
memory-should-contain [
3 <- 0 # no match
]
]
recipe split s:address:array:character, delim:character -> result:address:array:address:array:character [
local-scope
load-ingredients
# empty string? return empty array
len:number <- length *s
{
empty?:boolean <- equal len, 0
break-unless empty?
result <- new location:type, 0
reply
}
# count #pieces we need room for
count:number <- copy 1 # n delimiters = n+1 pieces
idx:number <- copy 0
{
idx <- find-next s, delim, idx
done?:boolean <- greater-or-equal idx, len
break-if done?
idx <- add idx, 1
count <- add count, 1
loop
}
# allocate space
result <- new location:type, count
# repeatedly copy slices start..end until delimiter into result[curr-result]
curr-result:number <- copy 0
start:number <- copy 0
{
# while next delim exists
done?:boolean <- greater-or-equal start, len
break-if done?
end:number <- find-next s, delim, start
# copy start..end into result[curr-result]
dest:address:address:array:character <- index-address *result, curr-result
*dest <- string-copy s, start, end
# slide over to next slice
start <- add end, 1
curr-result <- add curr-result, 1
loop
}
]
scenario string-split-1 [
run [
1:address:array:character <- new [a/b]
2:address:array:address:array:character <- split 1:address:array:character, 47/slash
3:number <- length *2:address:array:address:array:character
4:address:array:character <- index *2:address:array:address:array:character, 0
5:address:array:character <- index *2:address:array:address:array:character, 1
10:array:character <- copy *4:address:array:character
20:array:character <- copy *5:address:array:character
]
memory-should-contain [
3 <- 2 # length of result
10:string <- [a]
20:string <- [b]
]
]
scenario string-split-2 [
run [
1:address:array:character <- new [a/b/c]
2:address:array:address:array:character <- split 1:address:array:character, 47/slash
3:number <- length *2:address:array:address:array:character
4:address:array:character <- index *2:address:array:address:array:character, 0
5:address:array:character <- index *2:address:array:address:array:character, 1
6:address:array:character <- index *2:address:array:address:array:character, 2
10:array:character <- copy *4:address:array:character
20:array:character <- copy *5:address:array:character
30:array:character <- copy *6:address:array:character
]
memory-should-contain [
3 <- 3 # length of result
10:string <- [a]
20:string <- [b]
30:string <- [c]
]
]
scenario string-split-missing [
run [
1:address:array:character <- new [abc]
2:address:array:address:array:character <- split 1:address:array:character, 47/slash
3:number <- length *2:address:array:address:array:character
4:address:array:character <- index *2:address:array:address:array:character, 0
10:array:character <- copy *4:address:array:character
]
memory-should-contain [
3 <- 1 # length of result
10:string <- [abc]
]
]
scenario string-split-empty [
run [
1:address:array:character <- new []
2:address:array:address:array:character <- split 1:address:array:character, 47/slash
3:number <- length *2:address:array:address:array:character
]
memory-should-contain [
3 <- 0 # empty result
]
]
scenario string-split-empty-piece [
run [
1:address:array:character <- new [a/b//c]
2:address:array:address:array:character <- split 1:address:array:character, 47/slash
3:number <- length *2:address:array:address:array:character
4:address:array:character <- index *2:address:array:address:array:character, 0
5:address:array:character <- index *2:address:array:address:array:character, 1
6:address:array:character <- index *2:address:array:address:array:character, 2
7:address:array:character <- index *2:address:array:address:array:character, 3
10:array:character <- copy *4:address:array:character
20:array:character <- copy *5:address:array:character
30:array:character <- copy *6:address:array:character
40:array:character <- copy *7:address:array:character
]
memory-should-contain [
3 <- 4 # length of result
10:string <- [a]
20:string <- [b]
30:string <- []
40:string <- [c]
]
]
recipe split-first text:address:array:character, delim:character -> x:address:array:character, y:address:array:character [
local-scope
load-ingredients
# empty string? return empty strings
len:number <- length *text
{
empty?:boolean <- equal len, 0
break-unless empty?
x:address:array:character <- new []
y:address:array:character <- new []
reply
}
idx:number <- find-next text, delim, 0
x:address:array:character <- string-copy text, 0, idx
idx <- add idx, 1
y:address:array:character <- string-copy text, idx, len
]
scenario string-split-first [
run [
1:address:array:character <- new [a/b]
2:address:array:character, 3:address:array:character <- split-first 1:address:array:character, 47/slash
10:array:character <- copy *2:address:array:character
20:array:character <- copy *3:address:array:character
]
memory-should-contain [
10:string <- [a]
20:string <- [b]
]
]
# todo: make this generic
recipe string-copy buf:address:array:character, start:number, end:number -> result:address:array:character [
local-scope
load-ingredients
# if end is out of bounds, trim it
len:number <- length *buf
end:number <- min len, end
# allocate space for result
len <- subtract end, start
result:address:array:character <- new character:type, len
# copy start..end into result[curr-result]
src-idx:number <- copy start
dest-idx:number <- copy 0
{
done?:boolean <- greater-or-equal src-idx, end
break-if done?
src:character <- index *buf, src-idx
dest:address:character <- index-address *result, dest-idx
*dest <- copy src
src-idx <- add src-idx, 1
dest-idx <- add dest-idx, 1
loop
}
]
scenario string-copy-copies-substring [
run [
1:address:array:character <- new [abc]
2:address:array:character <- string-copy 1:address:array:character, 1, 3
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [bc]
]
]
scenario string-copy-out-of-bounds [
run [
1:address:array:character <- new [abc]
2:address:array:character <- string-copy 1:address:array:character, 2, 4
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- [c]
]
]
scenario string-copy-out-of-bounds-2 [
run [
1:address:array:character <- new [abc]
2:address:array:character <- string-copy 1:address:array:character, 3, 3
3:array:character <- copy *2:address:array:character
]
memory-should-contain [
3:string <- []
]
]
recipe min x:number, y:number -> z:number [
local-scope
load-ingredients
{
return-x?:boolean <- lesser-than x, y
break-if return-x?
reply y
}
reply x
]
recipe max x:number, y:number -> z:number [
local-scope
load-ingredients
{
return-x?:boolean <- greater-than x, y
break-if return-x?
reply y
}
reply x
]