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<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="Comment">//</span>
<span class="Comment">// Type trees aren't as general as s-expressions even if they look like them:</span>
<span class="Comment">// the first element of a type tree is always an atom, and left and right</span>
<span class="Comment">// pointers of non-atoms are never NULL. All type trees are 'dotted' in lisp</span>
<span class="Comment">// parlance.</span>
<span class="Comment">//</span>
<span class="Comment">// For now you can't use the simpler 'colon-based' representation inside type</span>
<span class="Comment">// trees. Once you start typing parens, keep on typing parens.</span>
<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario dilated_reagent_with_nested_brackets)</span>
def 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 Dilated Reagent Property(value)")</span>
value = parse_string_tree<span class="Delimiter">(</span>value<span class="Delimiter">);</span>
<span class="Delimiter">:(before "End Parsing Dilated Reagent Type Property(type_names)")</span>
type_names = parse_string_tree<span class="Delimiter">(</span>type_names<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>atom<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>s<span class="Delimiter">-></span>value<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>
<span class="Normal">delete</span> 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><span class="Normal">const</span> 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>
<span class="Normal">if</span> <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>
<span class="Normal">if</span> <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>
<span class="Normal">if</span> <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 = <span class="Normal">new</span> 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>
<span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
*curr = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">);</span>
<span class="Normal">if</span> <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>
<span class="Normal">else</span>
<span class="Delimiter">(</span>*curr<span class="Delimiter">)-></span>left = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>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>
assert<span class="Delimiter">(</span>*curr == <span class="Constant">NULL</span><span class="Delimiter">);</span>
<span class="Comment">// standardize the final element to always be on the right if it's an atom</span>
<span class="Comment">// (a b c) => (a b . c) in s-expression parlance</span>
string_tree* tmp = result<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>tmp<span class="Delimiter">-></span>right && tmp<span class="Delimiter">-></span>right<span class="Delimiter">-></span>right<span class="Delimiter">)</span> tmp = tmp<span class="Delimiter">-></span>right<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>!tmp<span class="Delimiter">-></span>right<span class="Delimiter">-></span>atom<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!tmp<span class="Delimiter">-></span>right<span class="Delimiter">-></span>left<span class="Delimiter">-></span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
string_tree* tmp2 = tmp<span class="Delimiter">-></span>right<span class="Delimiter">;</span>
tmp<span class="Delimiter">-></span>right = tmp2<span class="Delimiter">-></span>left<span class="Delimiter">;</span>
tmp2<span class="Delimiter">-></span>left = <span class="Constant">NULL</span><span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>tmp2<span class="Delimiter">-></span>right == <span class="Constant">NULL</span><span class="Delimiter">);</span>
<span class="Normal">delete</span> tmp2<span class="Delimiter">;</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>
def 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>
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