Add parser support for bits

Change-Id: I8f36a2639d3f4911c2fb825dd3bf28956886a9a6
diff --git a/src/ast_commands.hpp b/src/ast_commands.hpp
index b863640..d0c0985 100644
--- a/src/ast_commands.hpp
+++ b/src/ast_commands.hpp
@@ -299,6 +299,7 @@
 BOOST_FUSION_ADAPT_STRUCT(delete_, m_path)
 BOOST_FUSION_ADAPT_STRUCT(set_, m_path, m_data)
 BOOST_FUSION_ADAPT_STRUCT(enum_, m_value)
+BOOST_FUSION_ADAPT_STRUCT(bits_, m_bits)
 BOOST_FUSION_ADAPT_STRUCT(binary_, m_value)
 BOOST_FUSION_ADAPT_STRUCT(identityRef_, m_prefix, m_value)
 BOOST_FUSION_ADAPT_STRUCT(commit_)
diff --git a/src/leaf_data.hpp b/src/leaf_data.hpp
index fb490c7..964c154 100644
--- a/src/leaf_data.hpp
+++ b/src/leaf_data.hpp
@@ -154,6 +154,31 @@
     {
         return std::visit(*this, leafRef.m_targetType->m_type);
     }
+    bool operator()(const yang::Bits& bits) const
+    {
+        parserContext.m_suggestions.clear();
+        x3::symbols<std::string> parser;
+        for (const auto& bit : bits.m_allowedValues) {
+            parser.add(bit, bit);
+            parserContext.m_suggestions.insert(Completion{bit});
+        }
+
+        std::vector<std::string> bitsRes;
+
+        do {
+            std::string bit;
+            auto pass = parser.parse(first, last, ctx, rctx, bit);
+            if (pass) {
+                bitsRes.push_back(bit);
+                parser.remove(bit);
+                parserContext.m_suggestions.erase(Completion{bit});
+            }
+        } while (space_separator.parse(first, last, ctx, rctx, x3::unused));
+
+        attr = bits_{bitsRes};
+
+        return true;
+    }
     bool operator()(const yang::Union& unionInfo) const
     {
         return std::any_of(unionInfo.m_unionTypes.begin(), unionInfo.m_unionTypes.end(), [this](const auto& type) {
diff --git a/src/leaf_data_type.cpp b/src/leaf_data_type.cpp
index b7a3876..fe6fe04 100644
--- a/src/leaf_data_type.cpp
+++ b/src/leaf_data_type.cpp
@@ -104,4 +104,8 @@
 {
     return true;
 }
+bool Bits::operator==(const Bits& other) const
+{
+    return this->m_allowedValues == other.m_allowedValues;
+}
 }
diff --git a/src/leaf_data_type.hpp b/src/leaf_data_type.hpp
index 288f765..98cb12e 100644
--- a/src/leaf_data_type.hpp
+++ b/src/leaf_data_type.hpp
@@ -65,6 +65,10 @@
     bool operator==(const IdentityRef& other) const;
     std::set<identityRef_> m_allowedValues;
 };
+struct Bits {
+    bool operator==(const Bits& other) const;
+    std::set<std::string> m_allowedValues;
+};
 struct LeafRef;
 struct Union;
 using LeafDataType = std::variant<
@@ -83,6 +87,7 @@
     yang::Binary,
     yang::Empty,
     yang::IdentityRef,
+    yang::Bits,
     yang::LeafRef,
     yang::Union
 >;
diff --git a/src/utils.cpp b/src/utils.cpp
index 11a97b4..afb291e 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -135,6 +135,14 @@
         });
         return ss.str();
     }
+    std::string operator()(const yang::Bits& type)
+    {
+        std::ostringstream ss;
+        ss << "bits {";
+        std::copy(type.m_allowedValues.begin(), type.m_allowedValues.end(), std::experimental::make_ostream_joiner(ss, ", "));
+        ss << "}";
+        return ss.str();
+    }
 };
 
 std::string leafDataTypeToString(const yang::LeafDataType& type)
diff --git a/src/yang_schema.cpp b/src/yang_schema.cpp
index 681861e..8793dd4 100644
--- a/src/yang_schema.cpp
+++ b/src/yang_schema.cpp
@@ -249,6 +249,15 @@
         case LY_TYPE_LEAFREF:
             resType.emplace<yang::LeafRef>(::leafrefPath(type), std::make_unique<yang::TypeInfo>(leafType(::leafrefPath(type))));
             break;
+        case LY_TYPE_BITS:
+            {
+                auto resBits = yang::Bits{};
+                for (const auto& bit : type->info()->bits()->bit()) {
+                    resBits.m_allowedValues.emplace(bit->name());
+                }
+                resType.emplace<yang::Bits>(std::move(resBits));
+                break;
+            }
         case LY_TYPE_UNION:
             {
                 auto resUnion = yang::Union{};