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