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<pre id='vimCodeElement'>
<span class="Comment">// So far instructions can only contain linear lists of properties. Now we add</span>
<span class="Comment">// support for more complex trees of properties in dilated reagents. This will</span>
<span class="Comment">// come in handy later for expressing complex types, like "a dictionary from</span>
<span class="Comment">// (address to array of charaters) to (list of numbers)".</span>
<span class="Delimiter">:(scenario dilated_reagent_with_nested_brackets)</span>
recipe main [
<span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: <span class="Delimiter">(</span>bar <span class="Delimiter">(</span>baz quux<span class="Delimiter">))}</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+parse: product: {"1": "number", "foo": <"bar" : <<"baz" : <"quux" : <>>> : <>>>}</span>
<span class="Delimiter">:(before "End Parsing Reagent Property(value)")</span>
value = parse_string_tree<span class="Delimiter">(</span>value<span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
string_tree* parse_string_tree<span class="Delimiter">(</span>string_tree* s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!s<span class="Delimiter">-></span>left && !s<span class="Delimiter">-></span>right<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>s<span class="Delimiter">-></span>value<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Identifier">return</span> s<span class="Delimiter">;</span>
string_tree* result = parse_string_tree<span class="Delimiter">(</span>s<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
delete s<span class="Delimiter">;</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
string_tree* parse_string_tree<span class="Delimiter">(</span>const string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
in >> std::noskipws<span class="Delimiter">;</span>
<span class="Identifier">return</span> parse_string_tree<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
string_tree* parse_string_tree<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
string_tree* result = new string_tree<span class="Delimiter">(</span>next_word<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span> <span class="Comment">// skip '('</span>
string_tree* result = <span class="Constant">NULL</span><span class="Delimiter">;</span>
string_tree** curr = &result<span class="Delimiter">;</span>
while <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
*curr = new string_tree<span class="Delimiter">(</span><span class="Constant">""</span><span class="Delimiter">);</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">)</span>
<span class="Delimiter">(</span>*curr<span class="Delimiter">)-></span>left = parse_string_tree<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
else
<span class="Delimiter">(</span>*curr<span class="Delimiter">)-></span>value = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
curr = &<span class="Delimiter">(</span>*curr<span class="Delimiter">)-></span>right<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span> <span class="Comment">// skip ')'</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario dilated_reagent_with_type_tree)</span>
<span class="Special">% Hide_errors = true; // 'map' isn't defined yet</span>
recipe main [
<span class="Delimiter">{</span><span class="Constant">1</span>: <span class="Delimiter">(</span>foo <span class="Delimiter">(</span>address array character<span class="Delimiter">)</span> <span class="Delimiter">(</span>bar number<span class="Delimiter">))}</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="Comment"># just to avoid errors</span>
container foo [
]
container bar [
]
<span class="traceContains">+parse: product: {"1": <"foo" : <<"address" : <"array" : <"character" : <>>>> : <<"bar" : <"number" : <>>> : <>>>>}</span>
<span class="Comment">//: an exception is 'new', which takes a type tree as its ingredient *value*</span>
<span class="Delimiter">:(scenario dilated_reagent_with_new)</span>
recipe main [
x:address:number<span class="Special"> <- </span>new <span class="Delimiter">{(</span>foo bar<span class="Delimiter">)</span>: type<span class="Delimiter">}</span>
]
<span class="Comment"># type isn't defined so size is meaningless, but at least we parse the type correctly</span>
<span class="traceContains">+new: size of <"foo" : <"bar" : <>>> is 1</span>
<span class="Delimiter">:(before "End Post-processing(type_name) When Converting 'new'")</span>
type_name = parse_string_tree<span class="Delimiter">(</span>type_name<span class="Delimiter">);</span>
</pre>
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