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<span class="Comment">//: An alternative syntax for reagents that permits whitespace in properties,</span>
<span class="Comment">//: grouped by brackets. We'll use this ability in the next layer, when we</span>
<span class="Comment">//: generalize types from lists to trees of properties.</span>
<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario dilated_reagent)</span>
def main [
<span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+parse: product: {1: "number", "foo": "bar"}</span>
<span class="Delimiter">:(scenario load_trailing_space_after_curly_bracket)</span>
def main [
<span class="PreProc"> </span><span class="Comment"># line below has a space at the end</span>
<span class="Delimiter">{</span><span class="Error"> </span>
]
<span class="Comment"># successfully parsed</span>
<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario dilated_reagent_with_comment)</span>
def main [
<span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> <- </span>copy <span class="Constant">34</span> <span class="Comment"># test comment</span>
]
<span class="traceContains">+parse: product: {1: "number", "foo": "bar"}</span>
$error: <span class="Constant">0</span>
<span class="Delimiter">:(scenario dilated_reagent_with_comment_immediately_following)</span>
def main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Delimiter">{</span><span class="Constant">34</span>: literal<span class="Delimiter">}</span> <span class="Comment"># test comment</span>
]
$error: <span class="Constant">0</span>
<span class="Comment">//: First augment next_word to group balanced brackets together.</span>
<span class="Delimiter">:(before "End next_word Special-cases")</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">return</span> slurp_balanced_bracket<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Comment">// treat curlies mostly like parens, but don't mess up labels</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>start_of_dilated_reagent<span class="Delimiter">(</span>in<span class="Delimiter">))</span>
<span class="Identifier">return</span> slurp_balanced_bracket<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
<span class="Comment">// A curly is considered a label if it's the last thing on a line. Dilated</span>
<span class="Comment">// reagents should remain all on one line.</span>
<span class="Normal">bool</span> start_of_dilated_reagent<span class="Delimiter">(</span>istream& in<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="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Normal">int</span> pos = in<span class="Delimiter">.</span>tellg<span class="Delimiter">();</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span> <span class="Comment">// slurp '{'</span>
skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">char</span> next = in<span class="Delimiter">.</span>peek<span class="Delimiter">();</span>
in<span class="Delimiter">.</span>seekg<span class="Delimiter">(</span>pos<span class="Delimiter">);</span>
<span class="Identifier">return</span> next != <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// Assume the first letter is an open bracket, and read everything until the</span>
<span class="Comment">// matching close bracket.</span>
<span class="Comment">// We balance {} () and []. And we skip one character after '\'.</span>
string slurp_balanced_bracket<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
ostringstream result<span class="Delimiter">;</span>
<span class="Normal">char</span> c<span class="Delimiter">;</span>
list<<span class="Normal">char</span>> open_brackets<span class="Delimiter">;</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>in >> c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// always silently skip the next character</span>
result << c<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Delimiter">(</span>in >> c<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
result << c<span class="Delimiter">;</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'('</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">);</span>
open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>
open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'{'</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'}'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'{'</span><span class="Delimiter">);</span>
open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
result << c<span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
skip_whitespace_and_comments_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(after "Parsing reagent(string s)")</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s<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="Delimiter">{</span>
assert<span class="Delimiter">(</span>properties<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
in >> std::noskipws<span class="Delimiter">;</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span> <span class="Comment">// skip '{'</span>
name = slurp_key<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"invalid reagent "</span> << s << <span class="Constant">" without a name</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>name == <span class="Constant">"}"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"invalid empty reagent "</span> << s << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">{</span>
string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>next_word<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
<span class="Comment">// End Parsing Reagent Type Property(value)</span>
type = new_type_tree<span class="Delimiter">(</span>value<span class="Delimiter">);</span>
<span class="Normal">delete</span> value<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
string key = slurp_key<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>key<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">"}"</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>next_word<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
<span class="Comment">// End Parsing Reagent Property(value)</span>
properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair<string<span class="Delimiter">,</span> string_tree*><span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
string slurp_key<span class="Delimiter">(</span>istream& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
string result = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>!result<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> && *result<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
strip_last<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
<span class="Normal">while</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> || in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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