// Functions dealing with attributes and meta_items import std::map; import syntax::{ast, ast_util}; import driver::session::session; export attr_meta; export attr_metas; export find_linkage_metas; export should_inline; export find_attrs_by_name; export attrs_contains_name; export find_meta_items_by_name; export contains; export contains_name; export sort_meta_items; export remove_meta_items_by_name; export require_unique_names; export get_attr_name; export get_meta_item_name; export get_meta_item_value_str; export get_meta_item_value_str_by_name; export get_meta_item_list; export meta_item_value_from_list; export meta_item_list_from_list; export name_value_str_pair; export mk_name_value_item_str; export mk_name_value_item; export mk_list_item; export mk_word_item; export mk_attr; export native_abi; // From a list of crate attributes get only the meta_items that impact crate // linkage fn find_linkage_metas(attrs: [ast::attribute]) -> [@ast::meta_item] { let metas: [@ast::meta_item] = []; for attr: ast::attribute in find_attrs_by_name(attrs, "link") { alt attr.node.value.node { ast::meta_list(_, items) { metas += items; } _ { #debug("ignoring link attribute that has incorrect type"); } } } ret metas; } // True if something like #[inline] is found in the list of attrs. fn should_inline(attrs: [ast::attribute]) -> bool { attr::attrs_contains_name(attrs, "inline") } // Search a list of attributes and return only those with a specific name fn find_attrs_by_name(attrs: [ast::attribute], name: ast::ident) -> [ast::attribute] { let filter = ( fn@(a: ast::attribute) -> option { if get_attr_name(a) == name { option::some(a) } else { option::none } } ); ret vec::filter_map(attrs, filter); } fn attrs_contains_name(attrs: [ast::attribute], name: ast::ident) -> bool { vec::is_not_empty(find_attrs_by_name(attrs, name)) } fn get_attr_name(attr: ast::attribute) -> ast::ident { get_meta_item_name(@attr.node.value) } fn find_meta_items_by_name(metas: [@ast::meta_item], name: ast::ident) -> [@ast::meta_item] { let filter = fn@(&&m: @ast::meta_item) -> option<@ast::meta_item> { if get_meta_item_name(m) == name { option::some(m) } else { option::none } }; ret vec::filter_map(metas, filter); } fn get_meta_item_name(meta: @ast::meta_item) -> ast::ident { alt meta.node { ast::meta_word(n) { n } ast::meta_name_value(n, _) { n } ast::meta_list(n, _) { n } } } // Gets the string value if the meta_item is a meta_name_value variant // containing a string, otherwise none fn get_meta_item_value_str(meta: @ast::meta_item) -> option { alt meta.node { ast::meta_name_value(_, v) { alt v.node { ast::lit_str(s) { option::some(s) } _ { option::none } } } _ { option::none } } } fn get_meta_item_value_str_by_name(attrs: [ast::attribute], name: ast::ident) -> option { let mattrs = find_attrs_by_name(attrs, name); if vec::len(mattrs) > 0u { ret get_meta_item_value_str(attr_meta(mattrs[0])); } ret option::none; } fn get_meta_item_list(meta: @ast::meta_item) -> option<[@ast::meta_item]> { alt meta.node { ast::meta_list(_, l) { option::some(l) } _ { option::none } } } fn attr_meta(attr: ast::attribute) -> @ast::meta_item { @attr.node.value } // Get the meta_items from inside a vector of attributes fn attr_metas(attrs: [ast::attribute]) -> [@ast::meta_item] { let mitems = []; for a: ast::attribute in attrs { mitems += [attr_meta(a)]; } ret mitems; } fn eq(a: @ast::meta_item, b: @ast::meta_item) -> bool { ret alt a.node { ast::meta_word(na) { alt b.node { ast::meta_word(nb) { na == nb } _ { false } } } ast::meta_name_value(na, va) { alt b.node { ast::meta_name_value(nb, vb) { na == nb && va.node == vb.node } _ { false } } } ast::meta_list(na, la) { // FIXME (#607): Needs implementing // This involves probably sorting the list by name and // meta_item variant fail "unimplemented meta_item variant" } } } fn contains(haystack: [@ast::meta_item], needle: @ast::meta_item) -> bool { #debug("looking for %s", syntax::print::pprust::meta_item_to_str(*needle)); for item: @ast::meta_item in haystack { #debug("looking in %s", syntax::print::pprust::meta_item_to_str(*item)); if eq(item, needle) { #debug("found it!"); ret true; } } #debug("found it not :("); ret false; } fn contains_name(metas: [@ast::meta_item], name: ast::ident) -> bool { let matches = find_meta_items_by_name(metas, name); ret vec::len(matches) > 0u; } // FIXME: This needs to sort by meta_item variant in addition to the item name fn sort_meta_items(items: [@ast::meta_item]) -> [@ast::meta_item] { fn lteq(&&ma: @ast::meta_item, &&mb: @ast::meta_item) -> bool { fn key(m: @ast::meta_item) -> ast::ident { alt m.node { ast::meta_word(name) { name } ast::meta_name_value(name, _) { name } ast::meta_list(name, _) { name } } } ret key(ma) <= key(mb); } // This is sort of stupid here, converting to a vec of mutables and back let v: [mutable @ast::meta_item] = [mutable]; for mi: @ast::meta_item in items { v += [mutable mi]; } std::sort::quick_sort(lteq, v); let v2: [@ast::meta_item] = []; for mi: @ast::meta_item in v { v2 += [mi]; } ret v2; } fn remove_meta_items_by_name(items: [@ast::meta_item], name: str) -> [@ast::meta_item] { let filter = fn@(&&item: @ast::meta_item) -> option<@ast::meta_item> { if get_meta_item_name(item) != name { option::some(item) } else { option::none } }; ret vec::filter_map(items, filter); } fn require_unique_names(sess: session, metas: [@ast::meta_item]) { let map = map::new_str_hash(); for meta: @ast::meta_item in metas { let name = get_meta_item_name(meta); if map.contains_key(name) { sess.span_fatal(meta.span, #fmt["duplicate meta item `%s`", name]); } map.insert(name, ()); } } fn native_abi(attrs: [ast::attribute]) -> either::t { ret alt attr::get_meta_item_value_str_by_name(attrs, "abi") { option::none { either::right(ast::native_abi_cdecl) } option::some("rust-intrinsic") { either::right(ast::native_abi_rust_intrinsic) } option::some("cdecl") { either::right(ast::native_abi_cdecl) } option::some("stdcall") { either::right(ast::native_abi_stdcall) } option::some(t) { either::left("unsupported abi: " + t) } }; } fn meta_item_from_list( items: [@ast::meta_item], name: str ) -> option<@ast::meta_item> { let items = attr::find_meta_items_by_name(items, name); vec::last(items) } fn meta_item_value_from_list( items: [@ast::meta_item], name: str ) -> option { alt meta_item_from_list(items, name) { some(item) { alt attr::get_meta_item_value_str(item) { some(value) { some(value) } none { none } } } none { none } } } fn meta_item_list_from_list( items: [@ast::meta_item], name: str ) -> option<[@ast::meta_item]> { alt meta_item_from_list(items, name) { some(item) { attr::get_meta_item_list(item) } none { none } } } fn name_value_str_pair( item: @ast::meta_item ) -> option<(str, str)> { alt attr::get_meta_item_value_str(item) { some(value) { let name = attr::get_meta_item_name(item); some((name, value)) } none { none } } } fn span(item: T) -> ast::spanned { ret {node: item, span: ast_util::dummy_sp()}; } fn mk_name_value_item_str(name: ast::ident, value: str) -> @ast::meta_item { let value_lit = span(ast::lit_str(value)); ret mk_name_value_item(name, value_lit); } fn mk_name_value_item(name: ast::ident, value: ast::lit) -> @ast::meta_item { ret @span(ast::meta_name_value(name, value)); } fn mk_list_item(name: ast::ident, items: [@ast::meta_item]) -> @ast::meta_item { ret @span(ast::meta_list(name, items)); } fn mk_word_item(name: ast::ident) -> @ast::meta_item { ret @span(ast::meta_word(name)); } fn mk_attr(item: @ast::meta_item) -> ast::attribute { ret span({style: ast::attr_inner, value: *item}); } // // Local Variables: // mode: rust // fill-column: 78; // indent-tabs-mode: nil // c-basic-offset: 4 // buffer-file-coding-system: utf-8-unix // End: //