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//: An alternative syntax for reagents that permits whitespace in properties,
//: grouped by brackets. We'll use this ability in the next layer, when we
//: generalize types from lists to trees of properties.

void test_dilated_reagent() {
  load(
      "def main [\n"
      "  {1: number, foo: bar} <- copy 34\n"
      "]\n"
  );
  CHECK_TRACE_CONTENTS(
      "parse:   product: {1: \"number\", \"foo\": \"bar\"}\n"
  );
}

void test_load_trailing_space_after_curly_bracket() {
  load(
      "def main [\n
an>"]\n" "# successfully parsed\n" ); } void test_dilated_reagent_with_comment() { load( "def main [\n" " {1: number, foo: bar} <- copy 34 # test comment\n" "]\n" ); CHECK_TRACE_CONTENTS( "parse: product: {1: \"number\", \"foo\": \"bar\"}\n" ); CHECK_TRACE_COUNT("error", 0); } void test_dilated_reagent_with_comment_immediately_following() { load( "def main [\n" " 1:number <- copy {34: literal} # test comment\n" "]\n" ); CHECK_TRACE_COUNT("error", 0); } //: First augment next_word to group balanced brackets together. :(before "End next_word Special-cases") if (in.peek() == '(') return slurp_balanced_bracket(in); // treat curlies mostly like parens, but don't mess up labels if (start_of_dilated_reagent(in)) return slurp_balanced_bracket(in); :(code) // A curly is considered a label if it's the last thing on a line. Dilated // reagents should remain all on one line. bool start_of_dilated_reagent(istream& in) { if (in.peek() != '{') return false; int pos = in.tellg(); in.get(); // slurp '{' skip_whitespace_but_not_newline(in); char next = in.peek(); in.seekg(pos); return next != '\n'; } // Assume the first letter is an open bracket, and read everything until the // matching close bracket. // We balance {} () and []. string slurp_balanced_bracket(istream& in) { ostringstream result; char c; list<char> open_brackets; while (in >> c) { if (c == '(') open_brackets.push_back(c); if (c == ')') { if (open_brackets.empty() || open_brackets.back() != '(') { raise << "unbalanced ')'\n" << end(); continue; } assert(open_brackets.back() == '('); open_brackets.pop_back(); } if (c == '[') open_brackets.push_back(c); if (c == ']') { if (open_brackets.empty() || open_brackets.back() != '[') { raise << "unbalanced ']'\n" << end(); continue; } open_brackets.pop_back(); } if (c == '{') open_brackets.push_back(c); if (c == '}') { if (open_brackets.empty() || open_brackets.back() != '{') { raise << "unbalanced '}'\n" << end(); continue; } open_brackets.pop_back(); } result << c; if (open_brackets.empty()) break; } skip_whitespace_and_comments_but_not_newline(in); return result.str(); } :(after "Parsing reagent(string s)") if (starts_with(s, "{")) { assert(properties.empty()); istringstream in(s); in >> std::noskipws; in.get(); // skip '{' name = slurp_key(in); if (name.empty()) { raise << "invalid reagent '" << s << "' without a name\n" << end(); return; } if (name == "}") { raise << "invalid empty reagent '" << s << "'\n" << end(); return; } { string s = next_word(in); if (s.empty()) { assert(!has_data(in)); raise << "incomplete dilated reagent at end of file (0)\n" << end(); return; } string_tree* type_names = new string_tree(s); // End Parsing Dilated Reagent Type Property(type_names) type = new_type_tree(type_names); delete type_names; } while (has_data(in)) { string key = slurp_key(in); if (key.empty()) continue; if (key == "}") continue; string s = next_word(in); if (s.empty()) { assert(!has_data(in)); raise << "incomplete dilated reagent at end of file (1)\n" << end(); return; } string_tree* value = new string_tree(s); // End Parsing Dilated Reagent Property(value) properties.push_back(pair<string, string_tree*>(key, value)); } return; } :(code) string slurp_key(istream& in) { string result = next_word(in); if (result.empty()) { assert(!has_data(in)); raise << "incomplete dilated reagent at end of file (2)\n" << end(); return result; } while (!result.empty() && *result.rbegin() == ':') strip_last(result); while (isspace(in.peek()) || in.peek() == ':') in.get(); return result; }