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<span class="Comment"># Some useful helpers for dealing with strings.</span>
recipe string-equal <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
a:address:array:character<span class="Special"> <- </span>next-ingredient
a-len:integer<span class="Special"> <- </span>length a:address:array:character/deref
b:address:array:character<span class="Special"> <- </span>next-ingredient
b-len:integer<span class="Special"> <- </span>length b:address:array:character/deref
<span class="Comment"># compare lengths</span>
<span class="Delimiter">{</span>
trace <span class="Delimiter">[</span>string-equal<span class="Delimiter">]</span>, <span class="Delimiter">[</span>comparing lengths<span class="Delimiter">]</span>
length-equal?:boolean<span class="Special"> <- </span>equal a-len:integer, b-len:integer
<span class="Identifier">break-if</span> length-equal?:boolean
<span class="Identifier">reply</span> 0:literal
<span class="Delimiter">}</span>
<span class="Comment"># compare each corresponding character</span>
trace <span class="Delimiter">[</span>string-equal<span class="Delimiter">]</span>, <span class="Delimiter">[</span>comparing characters<span class="Delimiter">]</span>
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, a-len:integer
<span class="Identifier">break-if</span> done?:boolean
a2:character<span class="Special"> <- </span>index a:address:array:character/deref, i:integer
b2:character<span class="Special"> <- </span>index b:address:array:character/deref, i:integer
<span class="Delimiter">{</span>
chars-match?:boolean<span class="Special"> <- </span>equal a2:character, b2:character
<span class="Identifier">break-if</span> chars-match?:boolean
<span class="Identifier">reply</span> 0:literal
<span class="Delimiter">}</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> 1:literal
<span class="Delimiter">]</span>
scenario string-equal-reflexive <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
3:boolean/<span class="Special">raw <- </span>string-equal x:address:array:character, x:address:array:character
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>1 <span class="Comment"># x == x for all x</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario string-equal-identical <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
y:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
3:boolean/<span class="Special">raw <- </span>string-equal x:address:array:character, y:address:array:character
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>1 <span class="Comment"># abc == abc</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario string-equal-distinct-lengths <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
y:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abcd<span class="Delimiter">]</span>
3:boolean/<span class="Special">raw <- </span>string-equal x:address:array:character, y:address:array:character
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>0 <span class="Comment"># abc != abcd</span>
<span class="Delimiter">]</span>
trace-should-contain <span class="Delimiter">[</span>
string-equal: comparing lengths
<span class="Delimiter">]</span>
trace-should-not-contain <span class="Delimiter">[</span>
string-equal: comparing characters
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario string-equal-with-empty <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[]</span>
y:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abcd<span class="Delimiter">]</span>
3:boolean/<span class="Special">raw <- </span>string-equal x:address:array:character, y:address:array:character
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>0 <span class="Comment"># "" != abcd</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario string-equal-common-lengths-but-distinct <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
y:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>abd<span class="Delimiter">]</span>
3:boolean/<span class="Special">raw <- </span>string-equal x:address:array:character, y:address:array:character
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
3<span class="Special"> <- </span>0 <span class="Comment"># abc != abd</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Comment"># A new type to help incrementally construct strings.</span>
container buffer <span class="Delimiter">[</span>
length:integer
data:address:array:character
<span class="Delimiter">]</span>
recipe init-buffer <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
<span class="CommentedCode">#? $print default-space:address:array:location</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
result:address:buffer<span class="Special"> <- </span>new buffer:type
len:address:integer<span class="Special"> <- </span>get-address result:address:buffer/deref, length:offset
len:address:integer/deref<span class="Special"> <- </span>copy 0:literal
s:address:address:array:character<span class="Special"> <- </span>get-address result:address:buffer/deref, data:offset
capacity:integer<span class="Special"> <- </span>next-ingredient
s:address:address:array:character/deref<span class="Special"> <- </span>new character:type, capacity:integer
<span class="CommentedCode">#? $print s:address:address:array:character/deref</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="Identifier">reply</span> result:address:buffer
<span class="Delimiter">]</span>
recipe grow-buffer <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
in:address:buffer<span class="Special"> <- </span>next-ingredient
<span class="Comment"># double buffer size</span>
x:address:address:array:character<span class="Special"> <- </span>get-address in:address:buffer/deref, data:offset
oldlen:integer<span class="Special"> <- </span>length x:address:address:array:character/deref/deref
newlen:integer<span class="Special"> <- </span>multiply oldlen:integer, 2:literal
olddata:address:array:character<span class="Special"> <- </span>copy x:address:address:array:character/deref
x:address:address:array:character/deref<span class="Special"> <- </span>new character:type, newlen:integer
<span class="Comment"># copy old contents</span>
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, oldlen:integer
<span class="Identifier">break-if</span> done?:boolean
src:character<span class="Special"> <- </span>index olddata:address:array:character/deref, i:integer
dest:address:character<span class="Special"> <- </span>index-address x:address:address:array:character/deref/deref, i:integer
dest:address:character/deref<span class="Special"> <- </span>copy src:character
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> in:address:buffer
<span class="Delimiter">]</span>
recipe buffer-full? <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
in:address:buffer<span class="Special"> <- </span>next-ingredient
len:integer<span class="Special"> <- </span>get in:address:buffer/deref, length:offset
s:address:array:character<span class="Special"> <- </span>get in:address:buffer/deref, data:offset
capacity:integer<span class="Special"> <- </span>length s:address:array:character/deref
result:boolean<span class="Special"> <- </span>greater-or-equal len:integer, capacity:integer
<span class="Identifier">reply</span> result:boolean
<span class="Delimiter">]</span>
<span class="Comment"># in:address:buffer <- buffer-append in:address:buffer, c:character</span>
recipe buffer-append <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
in:address:buffer<span class="Special"> <- </span>next-ingredient
c:character<span class="Special"> <- </span>next-ingredient
<span class="Delimiter">{</span>
<span class="Comment"># grow buffer if necessary</span>
full?:boolean<span class="Special"> <- </span>buffer-full? in:address:buffer
<span class="Identifier">break-unless</span> full?:boolean
in:address:buffer<span class="Special"> <- </span>grow-buffer in:address:buffer
<span class="Delimiter">}</span>
len:address:integer<span class="Special"> <- </span>get-address in:address:buffer/deref, length:offset
s:address:array:character<span class="Special"> <- </span>get in:address:buffer/deref, data:offset
dest:address:character<span class="Special"> <- </span>index-address s:address:array:character/deref, len:address:integer/deref
dest:address:character/deref<span class="Special"> <- </span>copy c:character
len:address:integer/deref<span class="Special"> <- </span>add len:address:integer/deref, 1:literal
<span class="Identifier">reply</span> in:address:buffer/same-as-ingredient:0
<span class="Delimiter">]</span>
scenario buffer-append-works <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
x:address:buffer<span class="Special"> <- </span>init-buffer 3:literal
s1:address:array:character<span class="Special"> <- </span>get x:address:buffer/deref, data:offset
x:address:buffer<span class="Special"> <- </span>buffer-append x:address:buffer, 97:literal <span class="Comment"># 'a'</span>
x:address:buffer<span class="Special"> <- </span>buffer-append x:address:buffer, 98:literal <span class="Comment"># 'b'</span>
x:address:buffer<span class="Special"> <- </span>buffer-append x:address:buffer, 99:literal <span class="Comment"># 'c'</span>
s2:address:array:character<span class="Special"> <- </span>get x:address:buffer/deref, data:offset
1:boolean/<span class="Special">raw <- </span>equal s1:address:array:character, s2:address:array:character
<span class="CommentedCode">#? $print s2:address:array:character</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1060:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1061:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1062:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1063:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1064:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? $print 1065:integer/raw</span>
<span class="CommentedCode">#? $print [</span>
<span class="CommentedCode">#? ]</span>
2:array:character/<span class="Special">raw <- </span>copy s2:address:array:character/deref
<span class="Identifier"> +buffer-filled</span>
x:address:buffer<span class="Special"> <- </span>buffer-append x:address:buffer, 100:literal <span class="Comment"># 'd'</span>
s3:address:array:character<span class="Special"> <- </span>get x:address:buffer/deref, data:offset
10:boolean/<span class="Special">raw <- </span>equal s1:address:array:character, s3:address:array:character
11:integer/<span class="Special">raw <- </span>get x:address:buffer/deref, length:offset
12:array:character/<span class="Special">raw <- </span>copy s3:address:array:character/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
<span class="Comment"># before +buffer-filled</span>
1<span class="Special"> <- </span>1 <span class="Comment"># no change in data pointer</span>
2<span class="Special"> <- </span>3 <span class="Comment"># size of data</span>
3<span class="Special"> <- </span>97 <span class="Comment"># data</span>
4<span class="Special"> <- </span>98
5<span class="Special"> <- </span>99
<span class="Comment"># in the end</span>
10<span class="Special"> <- </span>0 <span class="Comment"># data pointer has grown</span>
11<span class="Special"> <- </span>4 <span class="Comment"># final length</span>
12<span class="Special"> <- </span>6 <span class="Comment"># but data's capacity has doubled</span>
13<span class="Special"> <- </span>97 <span class="Comment"># data</span>
14<span class="Special"> <- </span>98
15<span class="Special"> <- </span>99
16<span class="Special"> <- </span>100
17<span class="Special"> <- </span>0
18<span class="Special"> <- </span>0
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Comment"># result:address:array:character <- integer-to-decimal-string n:integer</span>
recipe integer-to-decimal-string <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
n:integer<span class="Special"> <- </span>next-ingredient
<span class="Comment"># is it zero?</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-if</span> n:integer
result:address:array:character<span class="Special"> <- </span>new <span class="Delimiter">[</span>0<span class="Delimiter">]</span>
<span class="Identifier">reply</span> result:address:array:character
<span class="Delimiter">}</span>
<span class="Comment"># save sign</span>
negate-result:boolean<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
negative?:boolean<span class="Special"> <- </span>lesser-than n:integer, 0:literal
<span class="Identifier">break-unless</span> negative?:boolean
negate-result:boolean<span class="Special"> <- </span>copy 1:literal
n:integer<span class="Special"> <- </span>multiply n:integer,<span class="Identifier"> -1</span>:literal
<span class="Delimiter">}</span>
<span class="Comment"># add digits from right to left into intermediate buffer</span>
tmp:address:buffer<span class="Special"> <- </span>init-buffer 30:literal
digit-base:integer<span class="Special"> <- </span>copy 48:literal <span class="Comment"># '0'</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>equal n:integer, 0:literal
<span class="Identifier">break-if</span> done?:boolean
n:integer, digit:integer<span class="Special"> <- </span>divide-with-remainder n:integer, 10:literal
c:character<span class="Special"> <- </span>add digit-base:integer, digit:integer
tmp:address:buffer<span class="Special"> <- </span>buffer-append tmp:address:buffer, c:character
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># add sign</span>
<span class="Delimiter">{</span>
<span class="Identifier">break-unless</span> negate-result:boolean
tmp:address:buffer<span class="Special"> <- </span>buffer-append tmp:address:buffer, 45:literal <span class="Comment"># '-'</span>
<span class="Delimiter">}</span>
<span class="Comment"># reverse buffer into string result</span>
len:integer<span class="Special"> <- </span>get tmp:address:buffer/deref, length:offset
buf:address:array:character<span class="Special"> <- </span>get tmp:address:buffer/deref, data:offset
result:address:array:character<span class="Special"> <- </span>new character:type, len:integer
i:integer<span class="Special"> <- </span>subtract len:integer, 1:literal
j:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
<span class="Comment"># while i >= 0</span>
done?:boolean<span class="Special"> <- </span>lesser-than i:integer, 0:literal
<span class="Identifier">break-if</span> done?:boolean
<span class="Comment"># result[j] = tmp[i]</span>
src:character<span class="Special"> <- </span>index buf:address:array:character/deref, i:integer
dest:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, j:integer
dest:address:character/deref<span class="Special"> <- </span>copy src:character
<span class="Comment"># ++i</span>
i:integer<span class="Special"> <- </span>subtract i:integer, 1:literal
<span class="Comment"># --j</span>
j:integer<span class="Special"> <- </span>add j:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> result:address:array:character
<span class="Delimiter">]</span>
scenario integer-to-decimal-digit-zero <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>integer-to-decimal-string 0:literal
2:array:character/<span class="Special">raw <- </span>copy 1:address:array:character/deref/<span class="Special">raw</span>
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
2:string<span class="Special"> <- </span><span class="Delimiter">[</span>0<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario integer-to-decimal-digit-positive <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>integer-to-decimal-string 234:literal
2:array:character/<span class="Special">raw <- </span>copy 1:address:array:character/deref/<span class="Special">raw</span>
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
2:string<span class="Special"> <- </span><span class="Delimiter">[</span>234<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario integer-to-decimal-digit-negative <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>integer-to-decimal-string<span class="Identifier"> -1</span>:literal
2:array:character/<span class="Special">raw <- </span>copy 1:address:array:character/deref/<span class="Special">raw</span>
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
2<span class="Special"> <- </span>2
3<span class="Special"> <- </span>45 <span class="Comment"># '-'</span>
4<span class="Special"> <- </span>49 <span class="Comment"># '1'</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
recipe string-append <span class="Delimiter">[</span>
default-space:address:array:location<span class="Special"> <- </span>new location:type, 30:literal
<span class="Comment"># result = new string[a.length + b.length]</span>
a:address:array:character<span class="Special"> <- </span>next-ingredient
a-len:integer<span class="Special"> <- </span>length a:address:array:character/deref
b:address:array:character<span class="Special"> <- </span>next-ingredient
b-len:integer<span class="Special"> <- </span>length b:address:array:character/deref
result-len:integer<span class="Special"> <- </span>add a-len:integer, b-len:integer
result:address:array:character<span class="Special"> <- </span>new character:type, result-len:integer
<span class="Comment"># copy a into result</span>
result-idx:integer<span class="Special"> <- </span>copy 0:literal
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
<span class="Comment"># while i < a.length</span>
a-done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, a-len:integer
<span class="Identifier">break-if</span> a-done?:boolean
<span class="Comment"># result[result-idx] = a[i]</span>
out:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, result-idx:integer
in:character<span class="Special"> <- </span>index a:address:array:character/deref, i:integer
out:address:character/deref<span class="Special"> <- </span>copy in:character
<span class="Comment"># ++i</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Comment"># ++result-idx</span>
result-idx:integer<span class="Special"> <- </span>add result-idx:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># copy b into result</span>
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
<span class="Comment"># while i < b.length</span>
b-done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, b-len:integer
<span class="Identifier">break-if</span> b-done?:boolean
<span class="Comment"># result[result-idx] = a[i]</span>
out:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, result-idx:integer
in:character<span class="Special"> <- </span>index b:address:array:character/deref, i:integer
out:address:character/deref<span class="Special"> <- </span>copy in:character
<span class="Comment"># ++i</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Comment"># ++result-idx</span>
result-idx:integer<span class="Special"> <- </span>add result-idx:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> result:address:array:character
<span class="Delimiter">]</span>
scenario string-append-1 <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>hello,<span class="Delimiter">]</span>
2:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span> world!<span class="Delimiter">]</span>
3:address:array:character/<span class="Special">raw <- </span>string-append 1:address:array:character/<span class="Special">raw</span>, 2:address:array:character/<span class="Special">raw</span>
4:array:character/<span class="Special">raw <- </span>copy 3:address:array:character/<span class="Special">raw</span>/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
4:string<span class="Special"> <- </span><span class="Delimiter">[</span>hello, world!<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Comment"># replace underscores in first with remaining args</span>
<span class="Comment"># result:address:array:character <- interpolate template:address:array:character, ...</span>
recipe interpolate <span class="Delimiter">[</span>
default-space:array:address:location<span class="Special"> <- </span>new location:type, 60:literal
template:address:array:character<span class="Special"> <- </span>next-ingredient
<span class="Comment"># compute result-len, space to allocate for result</span>
tem-len:integer<span class="Special"> <- </span>length template:address:array:character/deref
result-len:integer<span class="Special"> <- </span>copy tem-len:integer
<span class="Delimiter">{</span>
<span class="Comment"># while arg received</span>
a:address:array:character, arg-received?:boolean<span class="Special"> <- </span>next-ingredient
<span class="Identifier">break-unless</span> arg-received?:boolean
<span class="Comment"># result-len = result-len + arg.length - 1 for the 'underscore' being replaced</span>
a-len:integer<span class="Special"> <- </span>length a:address:array:character/deref
result-len:integer<span class="Special"> <- </span>add result-len:integer, a-len:integer
result-len:integer<span class="Special"> <- </span>subtract result-len:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="CommentedCode">#? $print tem-len:integer #? 1</span>
<span class="CommentedCode">#? $print [ ] #? 1</span>
<span class="CommentedCode">#? $print result-len:integer #? 1</span>
<span class="CommentedCode">#? $print [ #? 1</span>
<span class="CommentedCode">#? ] #? 1</span>
rewind-ingredients
_<span class="Special"> <- </span>next-ingredient <span class="Comment"># skip template</span>
<span class="Comment"># result = new array:character[result-len]</span>
result:address:array:character<span class="Special"> <- </span>new character:type, result-len:integer
<span class="Comment"># repeatedly copy sections of template and 'holes' into result</span>
result-idx:integer<span class="Special"> <- </span>copy 0:literal
i:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
<span class="Comment"># while arg received</span>
a:address:array:character, arg-received?:boolean<span class="Special"> <- </span>next-ingredient
<span class="Identifier">break-unless</span> arg-received?:boolean
<span class="Comment"># copy template into result until '_'</span>
<span class="Delimiter">{</span>
<span class="Comment"># while i < template.length</span>
tem-done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, tem-len:integer
<span class="Identifier">break-if</span> tem-done?:boolean, 2:blocks
<span class="Comment"># while template[i] != '_'</span>
in:character<span class="Special"> <- </span>index template:address:array:character/deref, i:integer
underscore?:boolean<span class="Special"> <- </span>equal in:character, 95:literal <span class="Comment"># '_'</span>
<span class="Identifier">break-if</span> underscore?:boolean
<span class="Comment"># result[result-idx] = template[i]</span>
out:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, result-idx:integer
out:address:character/deref<span class="Special"> <- </span>copy in:character
<span class="Comment"># ++i</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Comment"># ++result-idx</span>
result-idx:integer<span class="Special"> <- </span>add result-idx:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># copy 'a' into result</span>
j:integer<span class="Special"> <- </span>copy 0:literal
<span class="Delimiter">{</span>
<span class="Comment"># while j < a.length</span>
arg-done?:boolean<span class="Special"> <- </span>greater-or-equal j:integer, a-len:integer
<span class="Identifier">break-if</span> arg-done?:boolean
<span class="Comment"># result[result-idx] = a[j]</span>
in:character<span class="Special"> <- </span>index a:address:array:character/deref, j:integer
out:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, result-idx:integer
out:address:character/deref<span class="Special"> <- </span>copy in:character
<span class="Comment"># ++j</span>
j:integer<span class="Special"> <- </span>add j:integer, 1:literal
<span class="Comment"># ++result-idx</span>
result-idx:integer<span class="Special"> <- </span>add result-idx:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Comment"># skip '_' in template</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Identifier">loop</span> <span class="Comment"># interpolate next arg</span>
<span class="Delimiter">}</span>
<span class="Comment"># done with holes; copy rest of template directly into result</span>
<span class="Delimiter">{</span>
<span class="Comment"># while i < template.length</span>
tem-done?:boolean<span class="Special"> <- </span>greater-or-equal i:integer, tem-len:integer
<span class="Identifier">break-if</span> tem-done?:boolean
<span class="Comment"># result[result-idx] = template[i]</span>
in:character<span class="Special"> <- </span>index template:address:array:character/deref, i:integer
out:address:character<span class="Special"> <- </span>index-address result:address:array:character/deref, result-idx:integer
out:address:character/deref<span class="Special"> <- </span>copy in:character
<span class="Comment"># ++i</span>
i:integer<span class="Special"> <- </span>add i:integer, 1:literal
<span class="Comment"># ++result-idx</span>
result-idx:integer<span class="Special"> <- </span>add result-idx:integer, 1:literal
<span class="Identifier">loop</span>
<span class="Delimiter">}</span>
<span class="Identifier">reply</span> result:address:array:character
<span class="Delimiter">]</span>
scenario interpolate-works <span class="Delimiter">[</span>
<span class="CommentedCode">#? dump run #? 1</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>abc _<span class="Delimiter">]</span>
2:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>def<span class="Delimiter">]</span>
3:address:array:character/<span class="Special">raw <- </span>interpolate 1:address:array:character/<span class="Special">raw</span>, 2:address:array:character/<span class="Special">raw</span>
4:array:character/<span class="Special">raw <- </span>copy 3:address:array:character/<span class="Special">raw</span>/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
4:string<span class="Special"> <- </span><span class="Delimiter">[</span>abc def<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario interpolate-at-start <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>_, hello!<span class="Delimiter">]</span>
2:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
3:address:array:character/<span class="Special">raw <- </span>interpolate 1:address:array:character/<span class="Special">raw</span>, 2:address:array:character/<span class="Special">raw</span>
4:array:character/<span class="Special">raw <- </span>copy 3:address:array:character/<span class="Special">raw</span>/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
4:string<span class="Special"> <- </span><span class="Delimiter">[</span>abc, hello!<span class="Delimiter">]</span>
16<span class="Special"> <- </span>0 <span class="Comment"># out of bounds</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
scenario interpolate-at-end <span class="Delimiter">[</span>
run <span class="Delimiter">[</span>
1:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>hello, _<span class="Delimiter">]</span>
2:address:array:character/<span class="Special">raw <- </span>new <span class="Delimiter">[</span>abc<span class="Delimiter">]</span>
3:address:array:character/<span class="Special">raw <- </span>interpolate 1:address:array:character/<span class="Special">raw</span>, 2:address:array:character/<span class="Special">raw</span>
4:array:character/<span class="Special">raw <- </span>copy 3:address:array:character/<span class="Special">raw</span>/deref
<span class="Delimiter">]</span>
memory-should-contain <span class="Delimiter">[</span>
4:string<span class="Special"> <- </span><span class="Delimiter">[</span>hello, abc<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
<span class="Delimiter">]</span>
</pre>
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