jyapayne/cppast
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add basic concept support (#144)

Browse source
This commit is contained in:
waitingtocompile 2022-09-03 20:22:59 +01:00 • committed by GitHub
commit a937efbcbc
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
21 changed files with 396 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

59
src/libclang/template_parser.cpp
View file

@ -42,22 +42,64 @@ type_safe::optional<typename TemplateT::builder> get_builder(const detail::parse
std::unique_ptr<EntityT>(static_cast<EntityT*>(entity.release())));
}
cpp_token_string extract_parameter_constraint(const detail::parse_context& context,
const CXCursor& parent,
detail::cxtoken_iterator target_range_start,
detail::cxtoken_iterator target_range_end)
{
//search the parent context for the *exact* sequence in it's entirety
detail::cxtokenizer tokenizer(context.tu, context.file, parent);
detail::cxtoken_stream stream(tokenizer, parent);
detail::cxtoken_iterator found_start = detail::find_sequence(stream, target_range_start, target_range_end);
if(found_start == stream.end())
return detail::to_string(stream, stream.cur() + 1);
stream.set_cur(found_start);
stream.bump();
if (stream.peek() == "<")
detail::skip_brackets(stream);
detail::cxtoken_iterator constraint_end = stream.cur();
stream.set_cur(found_start);
//seek backwards until we are at the start of the qualified name
while(stream.peek().value() != "<" && stream.peek().value() != ",")
{
std::string str = stream.peek().value().std_str();
stream.bump_back();
}
stream.bump();
return detail::to_string(stream, constraint_end);
}
std::unique_ptr<cpp_template_parameter> parse_type_parameter(const detail::parse_context& context,
const CXCursor& cur)
const CXCursor& cur,
const CXCursor& parent)
{
DEBUG_ASSERT(clang_getCursorKind(cur) == CXCursor_TemplateTypeParameter,
detail::assert_handler{});
detail::cxtokenizer tokenizer(context.tu, context.file, cur);
detail::cxtoken_stream stream(tokenizer, cur);
auto name = detail::get_cursor_name(cur);
// syntax: typename/class [...] name [= ...]
auto keyword = cpp_template_keyword::keyword_class;
// syntax: typename/class/constraint [...] name [= ...]
auto keyword = cpp_template_keyword::keyword_class;
type_safe::optional<cpp_token_string> constraint = type_safe::nullopt;
if (detail::skip_if(stream, "typename"))
keyword = cpp_template_keyword::keyword_typename;
else
detail::skip(stream, "class");
else if (!detail::skip_if(stream, "class"))
{
keyword = cpp_template_keyword::concept_contraint;
//try to extract the constraint token string
constraint = extract_parameter_constraint(context, parent, stream.cur(), stream.end());
stream.bump();
if (stream.peek() == "<")
detail::skip_brackets(stream);
}
auto variadic = false;
if (detail::skip_if(stream, "..."))
@ -72,7 +114,7 @@ std::unique_ptr<cpp_template_parameter> parse_type_parameter(const detail::parse
def = detail::parse_raw_type(context, stream, stream.end());
return cpp_template_type_parameter::build(*context.idx, detail::get_entity_id(cur),
name.c_str(), keyword, variadic, std::move(def));
name.c_str(), keyword, variadic, std::move(def), constraint);
}
std::unique_ptr<cpp_template_parameter> parse_non_type_parameter(
@ -147,7 +189,7 @@ std::unique_ptr<cpp_template_template_parameter> parse_template_parameter(
detail::visit_children(cur, [&](const CXCursor& child) {
auto kind = clang_getCursorKind(child);
if (kind == CXCursor_TemplateTypeParameter)
builder.add_parameter(parse_type_parameter(context, child));
builder.add_parameter(parse_type_parameter(context, child, cur));
else if (kind == CXCursor_NonTypeTemplateParameter)
builder.add_parameter(parse_non_type_parameter(context, child));
else if (kind == CXCursor_TemplateTemplateParameter)
@ -188,7 +230,7 @@ void parse_parameters(Builder& builder, const detail::parse_context& context, co
detail::visit_children(cur, [&](const CXCursor& child) {
auto kind = clang_getCursorKind(child);
if (kind == CXCursor_TemplateTypeParameter)
builder.add_parameter(parse_type_parameter(context, child));
builder.add_parameter(parse_type_parameter(context, child, cur));
else if (kind == CXCursor_NonTypeTemplateParameter)
builder.add_parameter(parse_non_type_parameter(context, child));
else if (kind == CXCursor_TemplateTemplateParameter)
@ -389,3 +431,4 @@ std::unique_ptr<cpp_entity> detail::parse_cpp_class_template_specialization(
return builder.finish(*context.idx, detail::get_entity_id(cur),
builder.get().class_().is_definition());
}