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|
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<title>Mu - lambda_to_mu.mu</title>
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<pre id='vimCodeElement'>
<span class="SalientComment">## experimental compiler to translate programs written in a generic</span>
<span class="SalientComment">## expression-oriented language called 'lambda' into mu</span>
<span class="muScenario">scenario</span> convert-lambda [
run [
<span class="Constant">local-scope</span>
<span class="Constant">1</span>:text/<span class="Special">raw <- </span>lambda-to-mu <span class="Constant">[(add a (multiply b c))]</span>
<span class="Constant">2</span>:@:char/<span class="Special">raw <- </span>copy *<span class="Constant">1</span>:text/<span class="Special">raw</span>
]
memory-should-contain [
<span class="Constant">2</span>:@:char<span class="Special"> <- </span><span class="Constant">[t1 <- multiply b c</span>
<span class="Constant">result <- add a t1]</span>
]
]
<span class="muRecipe">def</span> lambda-to-mu in:text<span class="muRecipe"> -> </span>out:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
out<span class="Special"> <- </span>copy <span class="Constant">0</span>
cells:&:cell<span class="Special"> <- </span>parse in
out<span class="Special"> <- </span>to-mu cells
]
<span class="Comment"># 'parse' will turn lambda expressions into trees made of cells</span>
<span class="muData">exclusive-container</span> cell [
atom:text
pair:pair
]
<span class="Comment"># printed below as < first | rest ></span>
<span class="muData">container</span> pair [
first:&:cell
rest:&:cell
]
<span class="muRecipe">def</span> new-atom name:text<span class="muRecipe"> -> </span>result:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>new <span class="Constant">cell:type</span>
*result<span class="Special"> <- </span>merge <span class="Constant">0/tag:atom</span>, name
]
<span class="muRecipe">def</span> new-pair a:&:cell, b:&:cell<span class="muRecipe"> -> </span>result:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
result<span class="Special"> <- </span>new <span class="Constant">cell:type</span>
*result<span class="Special"> <- </span>merge <span class="Constant">1/tag:pair</span>, a/first, b/rest
]
<span class="muRecipe">def</span> is-atom? x:&:cell<span class="muRecipe"> -> </span>result:boolean [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">reply-unless</span> x, <span class="Constant">0/false</span>
_, result<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">atom:variant</span>
]
<span class="muRecipe">def</span> is-pair? x:&:cell<span class="muRecipe"> -> </span>result:boolean [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="muControl">reply-unless</span> x, <span class="Constant">0/false</span>
_, result<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">pair:variant</span>
]
<span class="muScenario">scenario</span> atom-is-not-pair [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[a]</span>
x:&:cell<span class="Special"> <- </span>new-atom s
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-atom? x
<span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>is-pair? x
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span>
]
]
<span class="muScenario">scenario</span> pair-is-not-atom [
<span class="Constant">local-scope</span>
<span class="Comment"># construct (a . nil)</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[a]</span>
x:&:cell<span class="Special"> <- </span>new-atom s
y:&:cell<span class="Special"> <- </span>new-pair x, <span class="Constant">0/nil</span>
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-atom? y
<span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>is-pair? y
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">0</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span>
]
]
<span class="muRecipe">def</span> atom-match? x:&:cell, pat:text<span class="muRecipe"> -> </span>result:boolean [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
s:text, is-atom?:boolean<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">atom:variant</span>
<span class="muControl">reply-unless</span> is-atom?, <span class="Constant">0/false</span>
result<span class="Special"> <- </span>equal pat, s
]
<span class="muScenario">scenario</span> atom-match [
<span class="Constant">local-scope</span>
x:&:cell<span class="Special"> <- </span>new-atom <span class="Constant">[abc]</span>
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>atom-match? x, <span class="Constant">[abc]</span>
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span>
]
]
<span class="muRecipe">def</span> first x:&:cell<span class="muRecipe"> -> </span>result:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
pair:pair, pair?:boolean<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">pair:variant</span>
<span class="muControl">reply-unless</span> pair?, <span class="Constant">0/nil</span>
result<span class="Special"> <- </span>get pair, <span class="Constant">first:offset</span>
]
<span class="muRecipe">def</span> rest x:&:cell<span class="muRecipe"> -> </span>result:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
pair:pair, pair?:boolean<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">pair:variant</span>
<span class="muControl">reply-unless</span> pair?, <span class="Constant">0/nil</span>
result<span class="Special"> <- </span>get pair, <span class="Constant">rest:offset</span>
]
<span class="muRecipe">def</span> set-first base:&:cell, new-first:&:cell<span class="muRecipe"> -> </span>base:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
pair:pair, is-pair?:boolean<span class="Special"> <- </span>maybe-convert *base, <span class="Constant">pair:variant</span>
<span class="muControl">reply-unless</span> is-pair?
pair<span class="Special"> <- </span>put pair, <span class="Constant">first:offset</span>, new-first
*base<span class="Special"> <- </span>merge <span class="Constant">1/pair</span>, pair
]
<span class="muRecipe">def</span> set-rest base:&:cell, new-rest:&:cell<span class="muRecipe"> -> </span>base:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
pair:pair, is-pair?:boolean<span class="Special"> <- </span>maybe-convert *base, <span class="Constant">pair:variant</span>
<span class="muControl">reply-unless</span> is-pair?
pair<span class="Special"> <- </span>put pair, <span class="Constant">rest:offset</span>, new-rest
*base<span class="Special"> <- </span>merge <span class="Constant">1/pair</span>, pair
]
<span class="muScenario">scenario</span> cell-operations-on-atom [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[a]</span>
x:&:cell<span class="Special"> <- </span>new-atom s
<span class="Constant">10</span>:&:cell/<span class="Special">raw <- </span>first x
<span class="Constant">11</span>:&:cell/<span class="Special">raw <- </span>rest x
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># first is nil</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># rest is nil</span>
]
]
<span class="muScenario">scenario</span> cell-operations-on-pair [
<span class="Constant">local-scope</span>
<span class="Comment"># construct (a . nil)</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[a]</span>
x:&:cell<span class="Special"> <- </span>new-atom s
y:&:cell<span class="Special"> <- </span>new-pair x, <span class="Constant">0/nil</span>
x2:&:cell<span class="Special"> <- </span>first y
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>equal x, x2
<span class="Constant">11</span>:&:cell/<span class="Special">raw <- </span>rest y
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># first is correct</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># rest is nil</span>
]
]
<span class="SalientComment">## convert lambda text to a tree of cells</span>
<span class="muRecipe">def</span> parse in:text<span class="muRecipe"> -> </span>out:&:cell [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
s:&:stream:char<span class="Special"> <- </span>new-stream in
out, s<span class="Special"> <- </span>parse s
trace <span class="Constant">2</span>, <span class="Constant">[app/parse]</span>, out
]
<span class="muRecipe">def</span> parse in:&:stream:char<span class="muRecipe"> -> </span>out:&:cell, in:&:stream:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># skip whitespace</span>
in<span class="Special"> <- </span>skip-whitespace in
c:char, eof?:boolean<span class="Special"> <- </span>peek in
<span class="muControl">reply-if</span> eof?, <span class="Constant">0/nil</span>
pair?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">40/open-paren</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> pair?
<span class="Comment"># atom</span>
b:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">30</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>end-of-stream? in
<span class="muControl">break-if</span> done?
<span class="Comment"># stop before close paren or space</span>
c:char<span class="Special"> <- </span>peek in
done?<span class="Special"> <- </span>equal c, <span class="Constant">41/close-paren</span>
<span class="muControl">break-if</span> done?
done?<span class="Special"> <- </span>space? c
<span class="muControl">break-if</span> done?
c<span class="Special"> <- </span>read in
b<span class="Special"> <- </span>append b, c
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
s:text<span class="Special"> <- </span>buffer-to-array b
out<span class="Special"> <- </span>new-atom s
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> pair?
<span class="Comment"># pair</span>
read in <span class="Comment"># skip the open-paren</span>
out<span class="Special"> <- </span>new <span class="Constant">cell:type</span> <span class="Comment"># start out with nil</span>
<span class="Comment"># read in first element of pair</span>
<span class="Delimiter">{</span>
end?:boolean<span class="Special"> <- </span>end-of-stream? in
not-end?:boolean<span class="Special"> <- </span>not end?
assert not-end?, <span class="Constant">[unbalanced '(' in expression]</span>
c<span class="Special"> <- </span>peek in
close-paren?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">41/close-paren</span>
<span class="muControl">break-if</span> close-paren?
first:&:cell, in<span class="Special"> <- </span>parse in
*out<span class="Special"> <- </span>merge <span class="Constant">1/pair</span>, first, <span class="Constant">0/nil</span>
<span class="Delimiter">}</span>
<span class="Comment"># read in any remaining elements</span>
curr:&:cell<span class="Special"> <- </span>copy out
<span class="Delimiter">{</span>
in<span class="Special"> <- </span>skip-whitespace in
end?:boolean<span class="Special"> <- </span>end-of-stream? in
not-end?:boolean<span class="Special"> <- </span>not end?
assert not-end?, <span class="Constant">[unbalanced '(' in expression]</span>
<span class="Comment"># termination check: ')'</span>
c<span class="Special"> <- </span>peek in
<span class="Delimiter">{</span>
close-paren?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">41/close-paren</span>
<span class="muControl">break-unless</span> close-paren?
read in <span class="Comment"># skip ')'</span>
<span class="muControl">break</span> <span class="Constant">+end-pair:label</span>
<span class="Delimiter">}</span>
<span class="Comment"># still here? read next element of pair</span>
next:&:cell, in<span class="Special"> <- </span>parse in
is-dot?:boolean<span class="Special"> <- </span>atom-match? next, <span class="Constant">[.]</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> is-dot?
next-curr:&:cell<span class="Special"> <- </span>new-pair next, <span class="Constant">0/nil</span>
curr<span class="Special"> <- </span>set-rest curr, next-curr
curr<span class="Special"> <- </span>rest curr
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
<span class="muControl">break-unless</span> is-dot?
<span class="Comment"># deal with dotted pair</span>
in<span class="Special"> <- </span>skip-whitespace in
c<span class="Special"> <- </span>peek in
not-close-paren?:boolean<span class="Special"> <- </span>not-equal c, <span class="Constant">41/close-paren</span>
assert not-close-paren?, <span class="Constant">[')' cannot immediately follow '.']</span>
final:&:cell<span class="Special"> <- </span>parse in
curr<span class="Special"> <- </span>set-rest curr, final
<span class="Comment"># we're not gonna update curr, so better make sure the next iteration</span>
<span class="Comment"># is going to end the pair</span>
in<span class="Special"> <- </span>skip-whitespace in
c<span class="Special"> <- </span>peek in
close-paren?:boolean<span class="Special"> <- </span>equal c, <span class="Constant">41/close-paren</span>
assert close-paren?, <span class="Constant">['.' must be followed by exactly one expression before ')']</span>
<span class="Delimiter">}</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
<span class="Constant"> +end-pair</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> skip-whitespace in:&:stream:char<span class="muRecipe"> -> </span>in:&:stream:char [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </span>end-of-stream? in
<span class="muControl">reply-if</span> done?, <span class="Constant">0/null</span>
c:char<span class="Special"> <- </span>peek in
space?:boolean<span class="Special"> <- </span>space? c
<span class="muControl">break-unless</span> space?
read in <span class="Comment"># skip</span>
<span class="muControl">loop</span>
<span class="Delimiter">}</span>
]
<span class="muRecipe">def</span> to-text x:&:cell<span class="muRecipe"> -> </span>out:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
buf:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">30</span>
buf<span class="Special"> <- </span>to-buffer x, buf
out<span class="Special"> <- </span>buffer-to-array buf
]
<span class="muRecipe">def</span> to-buffer x:&:cell, buf:&:buffer<span class="muRecipe"> -> </span>buf:&:buffer [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># base case: empty cell</span>
<span class="Delimiter">{</span>
<span class="muControl">break-if</span> x
buf<span class="Special"> <- </span>append buf, <span class="Constant">[<>]</span>
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># base case: atom</span>
<span class="Delimiter">{</span>
s:text, atom?:boolean<span class="Special"> <- </span>maybe-convert *x, <span class="Constant">atom:variant</span>
<span class="muControl">break-unless</span> atom?
buf<span class="Special"> <- </span>append buf, s
<span class="muControl">reply</span>
<span class="Delimiter">}</span>
<span class="Comment"># recursive case: pair</span>
buf<span class="Special"> <- </span>append buf, <span class="Constant">[< ]</span>
first:&:cell<span class="Special"> <- </span>first x
buf<span class="Special"> <- </span>to-buffer first, buf
buf<span class="Special"> <- </span>append buf, <span class="Constant">[ | ]</span>
rest:&:cell<span class="Special"> <- </span>rest x
buf<span class="Special"> <- </span>to-buffer rest, buf
buf<span class="Special"> <- </span>append buf, <span class="Constant">[ >]</span>
]
<span class="muScenario">scenario</span> parse-single-letter-atom [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[a]</span>
x:&:cell<span class="Special"> <- </span>parse s
s2:text, <span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x, <span class="Constant">atom:variant</span>
<span class="Constant">11</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is an atom</span>
<span class="Constant">11</span>:@:char<span class="Special"> <- </span><span class="Constant">[a]</span>
]
]
<span class="muScenario">scenario</span> parse-atom [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[abc]</span>
x:&:cell<span class="Special"> <- </span>parse s
s2:text, <span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x, <span class="Constant">atom:variant</span>
<span class="Constant">11</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is an atom</span>
<span class="Constant">11</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span>
]
]
<span class="muScenario">scenario</span> parse-list-of-two-atoms [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[(abc def)]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < abc | < <span class="muRecipe">def</span> | <span class="Constant"><></span> > >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
x2:&:cell<span class="Special"> <- </span>rest x
s1:text, <span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x1, <span class="Constant">atom:variant</span>
<span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>is-pair? x2
x3:&:cell<span class="Special"> <- </span>first x2
s2:text, <span class="Constant">13</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x3, <span class="Constant">atom:variant</span>
<span class="Constant">14</span>:&:cell/<span class="Special">raw <- </span>rest x2
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is an atom</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest is a pair</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.first is an atom</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.rest.rest is nil</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest.first</span>
]
]
<span class="muScenario">scenario</span> parse-list-with-extra-spaces [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[ ( abc def ) ]</span> <span class="Comment"># extra spaces</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < abc | < <span class="muRecipe">def</span> | <span class="Constant"><></span> > >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
x2:&:cell<span class="Special"> <- </span>rest x
s1:text, <span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x1, <span class="Constant">atom:variant</span>
<span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>is-pair? x2
x3:&:cell<span class="Special"> <- </span>first x2
s2:text, <span class="Constant">13</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x3, <span class="Constant">atom:variant</span>
<span class="Constant">14</span>:&:cell/<span class="Special">raw <- </span>rest x2
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is an atom</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest is a pair</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.first is an atom</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.rest.rest is nil</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest.first</span>
]
]
<span class="muScenario">scenario</span> parse-list-of-more-than-two-atoms [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[(abc def ghi)]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < abc | < <span class="muRecipe">def</span> | < ghi | <span class="Constant"><></span> > > >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
x2:&:cell<span class="Special"> <- </span>rest x
s1:text, <span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x1, <span class="Constant">atom:variant</span>
<span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>is-pair? x2
x3:&:cell<span class="Special"> <- </span>first x2
s2:text, <span class="Constant">13</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x3, <span class="Constant">atom:variant</span>
x4:&:cell<span class="Special"> <- </span>rest x2
<span class="Constant">14</span>:boolean/<span class="Special">raw <- </span>is-pair? x4
x5:&:cell<span class="Special"> <- </span>first x4
s3:text, <span class="Constant">15</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x5, <span class="Constant">atom:variant</span>
<span class="Constant">16</span>:&:cell/<span class="Special">raw <- </span>rest x4
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
<span class="Constant">40</span>:@:char/<span class="Special">raw <- </span>copy *s3
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is an atom</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest is a pair</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.first is an atom</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.rest is a pair</span>
<span class="Constant">15</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.rest.first is an atom</span>
<span class="Constant">16</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.rest.rest.rest is nil</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest.first</span>
<span class="Constant">40</span>:@:char<span class="Special"> <- </span><span class="Constant">[ghi]</span> <span class="Comment"># result.rest.rest</span>
]
]
<span class="muScenario">scenario</span> parse-nested-list [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[((abc))]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < < abc | <span class="Constant"><></span> > | <span class="Constant"><></span> >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
<span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x2:&:cell<span class="Special"> <- </span>first x1
s1:text, <span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x2, <span class="Constant">atom:variant</span>
<span class="Constant">13</span>:&:cell/<span class="Special">raw <- </span>rest x1
<span class="Constant">14</span>:&:cell/<span class="Special">raw <- </span>rest x
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is a pair</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first.first is an atom</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.first.rest is nil</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.rest is nil</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first.first</span>
]
]
<span class="muScenario">scenario</span> parse-nested-list-2 [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[((abc) def)]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < < abc | <span class="Constant"><></span> > | < <span class="muRecipe">def</span> | <span class="Constant"><></span> > >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
<span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x2:&:cell<span class="Special"> <- </span>first x1
s1:text, <span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x2, <span class="Constant">atom:variant</span>
<span class="Constant">13</span>:&:cell/<span class="Special">raw <- </span>rest x1
x3:&:cell<span class="Special"> <- </span>rest x
x4:&:cell<span class="Special"> <- </span>first x3
s2:text, <span class="Constant">14</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x4, <span class="Constant">atom:variant</span>
<span class="Constant">15</span>:&:cell/<span class="Special">raw <- </span>rest x3
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is a pair</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first.first is an atom</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.first.rest is nil</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.first is an atom</span>
<span class="Constant">15</span><span class="Special"> <- </span><span class="Constant">0</span> <span class="Comment"># result.rest.rest is nil</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest.first</span>
]
]
<span class="Comment"># todo: uncomment these tests after we figure out how to continue tests after</span>
<span class="Comment"># assertion failures</span>
<span class="CommentedCode">#? scenario parse-error [</span>
<span class="CommentedCode">#? local-scope</span>
<span class="CommentedCode">#? s:text <- new [(]</span>
<span class="CommentedCode">#? #? hide-errors</span>
<span class="CommentedCode">#? x:&:cell <- parse s</span>
<span class="CommentedCode">#? #? show-errors</span>
<span class="CommentedCode">#? trace-should-contain [</span>
<span class="CommentedCode">#? error: unbalanced '(' in expression</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? </span>
<span class="CommentedCode">#? scenario parse-error-after-element [</span>
<span class="CommentedCode">#? local-scope</span>
<span class="CommentedCode">#? s:text <- new [(abc]</span>
<span class="CommentedCode">#? #? hide-errors</span>
<span class="CommentedCode">#? x:&:cell <- parse s</span>
<span class="CommentedCode">#? #? show-errors</span>
<span class="CommentedCode">#? trace-should-contain [</span>
<span class="CommentedCode">#? error: unbalanced '(' in expression</span>
<span class="CommentedCode">#? ]</span>
<span class="CommentedCode">#? ]</span>
<span class="muScenario">scenario</span> parse-dotted-list-of-two-atoms [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[(abc . def)]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < abc | <span class="muRecipe">def</span> >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
x2:&:cell<span class="Special"> <- </span>rest x
s1:text, <span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x1, <span class="Constant">atom:variant</span>
s2:text, <span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x2, <span class="Constant">atom:variant</span>
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
memory-should-contain [
<span class="Comment"># parses to < abc | def ></span>
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is an atom</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest is an atom</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest</span>
]
]
<span class="muScenario">scenario</span> parse-dotted-list-of-more-than-two-atoms [
<span class="Constant">local-scope</span>
s:text<span class="Special"> <- </span>new <span class="Constant">[(abc def . ghi)]</span>
x:&:cell<span class="Special"> <- </span>parse s
trace-should-contain [
app/parse: < abc | < <span class="muRecipe">def</span> | ghi > >
]
<span class="Constant">10</span>:boolean/<span class="Special">raw <- </span>is-pair? x
x1:&:cell<span class="Special"> <- </span>first x
x2:&:cell<span class="Special"> <- </span>rest x
s1:text, <span class="Constant">11</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x1, <span class="Constant">atom:variant</span>
<span class="Constant">12</span>:boolean/<span class="Special">raw <- </span>is-pair? x2
x3:&:cell<span class="Special"> <- </span>first x2
s2:text, <span class="Constant">13</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x3, <span class="Constant">atom:variant</span>
x4:&:cell<span class="Special"> <- </span>rest x2
s3:text, <span class="Constant">14</span>:boolean/<span class="Special">raw <- </span>maybe-convert *x4, <span class="Constant">atom:variant</span>
<span class="Constant">20</span>:@:char/<span class="Special">raw <- </span>copy *s1
<span class="Constant">30</span>:@:char/<span class="Special">raw <- </span>copy *s2
<span class="Constant">40</span>:@:char/<span class="Special">raw <- </span>copy *s3
memory-should-contain [
<span class="Constant">10</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># parse result is a pair</span>
<span class="Constant">11</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.first is an atom</span>
<span class="Constant">12</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest is a pair</span>
<span class="Constant">13</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.first is an atom</span>
<span class="Constant">14</span><span class="Special"> <- </span><span class="Constant">1</span> <span class="Comment"># result.rest.rest is an atom</span>
<span class="Constant">20</span>:@:char<span class="Special"> <- </span><span class="Constant">[abc]</span> <span class="Comment"># result.first</span>
<span class="Constant">30</span>:@:char<span class="Special"> <- </span><span class="Constant">[def]</span> <span class="Comment"># result.rest.first</span>
<span class="Constant">40</span>:@:char<span class="Special"> <- </span><span class="Constant">[ghi]</span> <span class="Comment"># result.rest.rest</span>
]
]
<span class="SalientComment">## convert tree of cells to mu text</span>
<span class="muRecipe">def</span> to-mu in:&:cell<span class="muRecipe"> -> </span>out:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
buf:&:buffer<span class="Special"> <- </span>new-buffer <span class="Constant">30</span>
buf<span class="Special"> <- </span>to-mu in, buf
out<span class="Special"> <- </span>buffer-to-array buf
]
<span class="muRecipe">def</span> to-mu in:&:cell, buf:&:buffer<span class="muRecipe"> -> </span>buf:&:buffer, result-name:text [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Comment"># null cell? no change.</span>
<span class="Comment"># pair with all atoms? gensym a new variable</span>
<span class="Comment"># pair containing other pairs? recurse</span>
result-name<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
</pre>
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