Method for using structs / json to access attributes

components/multimesh/src/wmtk/components/multimesh/CMakeLists.txt

@@ -23,12 +23,24 @@ set(SRC_FILES
 
     NamedMultiMesh.hpp
     NamedMultiMesh.cpp
-    utils/get_attribute.hpp
-    utils/get_attribute.cpp
     internal/split_path.hpp
 
     MeshCollection.hpp
     MeshCollection.cpp
+
+    utils/AttributeDescription.hpp
+    utils/AttributeDescription.cpp
+
+    utils/get_attribute.hpp
+    utils/get_attribute.cpp
+    utils/detail/attribute_error.hpp
+
+    utils/detail/named_error_text.hpp
+    utils/detail/named_error_text.cpp
+    utils/detail/attribute_ambiguous_error.hpp
+    utils/detail/attribute_ambiguous_error.cpp
+    utils/detail/attribute_missing_error.hpp
+    utils/detail/attribute_missing_error.cpp
 )
 
 include(stb)

components/multimesh/src/wmtk/components/multimesh/MeshCollection.cpp

@@ -8,11 +8,12 @@
 namespace wmtk::components::multimesh {
 
 
-NamedMultiMesh& MeshCollection::add_mesh(NamedMultiMesh m)
+NamedMultiMesh& MeshCollection::add_mesh(NamedMultiMesh&& m)
 {
     auto mptr = std::make_unique<NamedMultiMesh>(std::move(m));
     auto [it, did] = m_meshes.emplace(mptr->root_name(), std::move(mptr));
 
+
     return *it->second;
 }
 
@@ -51,6 +52,7 @@
 
 const NamedMultiMesh& MeshCollection::get_named_multimesh(const std::string_view& path) const
 {
+    assert(!m_meshes.empty());
     using namespace std;
 #if defined(WMTK_ENABLED_CPP20)
     std::ranges::view auto split = internal::split_path(path);
@@ -63,6 +65,19 @@
                              "assuming that is the right mesh");
         return *m_meshes.begin()->second;
     }
+    if (auto it = m_meshes.find(nmm_name); it == m_meshes.end()) {
+        std::vector<std::string_view> names;
+        std::transform(
+            m_meshes.begin(),
+            m_meshes.end(),
+            std::back_inserter(names),
+            [](const auto& pr) { return pr.first; });
+        wmtk::logger().error(
+            "Was unable to find root mesh name {} among {} names [{}] in MeshCollection",
+            nmm_name,
+            m_meshes.size(),
+            fmt::join(names, ","));
+    }
     return *m_meshes.at(nmm_name);
 }
 NamedMultiMesh& MeshCollection::get_named_multimesh(const std::string_view& path)
@@ -80,7 +95,12 @@
                              "assuming that is the right mesh");
         return *m_meshes.begin()->second;
     }
-    return *m_meshes.at(nmm_name);
+    try {
+        return *m_meshes.at(nmm_name);
+    } catch (const std::runtime_error& e) {
+        wmtk::logger().warn("Failed to find mesh named {} in mesh list. Path was ", nmm_name, path);
+        throw e;
+    }
 }
 std::map<std::string, const Mesh&> MeshCollection::all_meshes() const
 // std::map<std::string, std::shared_ptr<const Mesh>> MeshCollection::all_meshes() const

components/multimesh/src/wmtk/components/multimesh/MeshCollection.hpp

@@ -9,7 +9,7 @@ class InputOptions;
 class MeshCollection
 {
 public:
-    NamedMultiMesh& add_mesh(NamedMultiMesh o);
+    NamedMultiMesh& add_mesh(NamedMultiMesh&& o);
     template <typename... Args>
     NamedMultiMesh& emplace_mesh(Args&&... args)
     {

components/multimesh/src/wmtk/components/multimesh/NamedMultiMesh.cpp

@@ -157,7 +157,12 @@ auto NamedMultiMesh::get_id(const std::string_view& path) const -> std::vector<i
     Node const* cur_mesh = m_name_root.get();
     assert(*split.begin() == cur_mesh->name || *split.begin() == "");
     for (const auto& token : std::ranges::views::drop(split, 1)) {
+        // try {
         int64_t index = cur_mesh->m_child_indexer.at(std::string(token));
+        //} catch(const std::runtime_error& e) {
+        //    wmtk::logger().warn("Failed to find mesh named {} in mesh list. Path was ", nmm_name,
+        //    path); throw e;
+        //}
         indices.emplace_back(index);
         cur_mesh = cur_mesh->m_children[index].get();
     }

components/multimesh/src/wmtk/components/multimesh/NamedMultiMesh.hpp

@@ -17,15 +17,22 @@ class NamedMultiMesh
 {
 public:
     NamedMultiMesh();
-    explicit NamedMultiMesh(Mesh& m, const std::string& root_name);
     NamedMultiMesh(Mesh& m, const std::string_view& root_name);
     explicit NamedMultiMesh(Mesh& m, const nlohmann::json& root_name);
+
+    // Explicit constructors to remove ambiguities between string_view and json constructors
+    explicit NamedMultiMesh(Mesh& m, const std::string& root_name);
+    template <size_t N>
+    explicit NamedMultiMesh(Mesh& m, const char name[N])
+        : NamedMultiMesh(m, std::string_view(name))
+    {}
     // NamedMultiMesh(NamedMultiMesh&&);
     NamedMultiMesh(const NamedMultiMesh&);
     ~NamedMultiMesh();
     // auto operator=(NamedMultiMesh&&) -> NamedMultiMesh&;
     auto operator=(const NamedMultiMesh&) -> NamedMultiMesh&;
 
+    /// sets just the name of the root mesh, keeping child names the same
     void set_name(const std::string_view& root_name = "");
     void set_names(const nlohmann::json& js);
     void set_root(Mesh& m);

components/multimesh/src/wmtk/components/multimesh/utils/AttributeDescription.cpp

@@ -0,0 +1,70 @@
+#include "AttributeDescription.hpp"
+#include <nlohmann/json.hpp>
+
+#include <wmtk/components/utils/json_serialize_enum.hpp>
+namespace wmtk::attribute {
+// TODO: this definitely will cause a conflict someday if someone else wants to serialize
+// attributetype
+WMTK_NLOHMANN_JSON_SERIALIZE_ENUM(
+    AttributeType,
+    {
+        {AttributeType::Char, "char"},
+        {AttributeType::Double, "double"},
+        {AttributeType::Int64, "int"},
+        {AttributeType::Rational, "rational"},
+    })
+} // namespace wmtk::attribute
+
+namespace wmtk::components::multimesh::utils {
+auto AttributeDescription::operator<=>(const AttributeDescription&) const -> std::strong_ordering =
+                                                                                 default;
+auto AttributeDescription::operator==(const AttributeDescription&) const -> bool = default;
+
+namespace {
+NLOHMANN_JSON_SERIALIZE_ENUM(
+    PrimitiveType,
+    {
+        {PrimitiveType::Vertex, 0},
+        {PrimitiveType::Edge, 1},
+        {PrimitiveType::Triangle, 2},
+        {PrimitiveType::Tetrahedron, 3},
+    })
+} // namespace
+WMTK_NLOHMANN_JSON_FRIEND_TO_JSON_PROTOTYPE(AttributeDescription)
+{
+    WMTK_NLOHMANN_ASSIGN_TYPE_TO_JSON(path);
+    if (nlohmann_json_t.dimension.has_value()) {
+        nlohmann_json_j["dimension"] = nlohmann_json_t.dimension.value();
+    }
+    if (nlohmann_json_t.type.has_value()) {
+        nlohmann_json_j["type"] = nlohmann_json_t.type.value();
+    }
+}
+WMTK_NLOHMANN_JSON_FRIEND_FROM_JSON_PROTOTYPE(AttributeDescription)
+{
+    if (nlohmann_json_j.is_string()) {
+        nlohmann_json_t.path = nlohmann_json_j.get<std::string>();
+    } else {
+        nlohmann_json_t.path = nlohmann_json_j["path"];
+    }
+    if (nlohmann_json_j.contains("dimension")) {
+        nlohmann_json_t.dimension = nlohmann_json_j["dimension"];
+    }
+    if (nlohmann_json_j.contains("type")) {
+        nlohmann_json_t.type = nlohmann_json_j["type"];
+    }
+}
+
+std::optional<PrimitiveType> AttributeDescription::primitive_type() const
+{
+    if (this->dimension.has_value()) {
+        int8_t d = this->dimension.value();
+        assert(d < 4);
+
+        return get_primitive_type_from_id(d);
+    } else {
+        return {};
+    }
+}
+
+} // namespace wmtk::components::multimesh::utils

components/multimesh/src/wmtk/components/multimesh/utils/AttributeDescription.hpp

@@ -0,0 +1,59 @@
+#pragma once
+#include <compare>
+#include <optional>
+#include <wmtk/PrimitiveType.hpp>
+#include <wmtk/attribute/AttributeType.hpp>
+#include <wmtk/components/utils/json_macros.hpp>
+
+namespace wmtk::attribute {
+WMTK_NLOHMANN_JSON_DECLARATION(AttributeType)
+}
+
+namespace wmtk::components::multimesh::utils {
+
+
+// the minimal information to uniquely extract an attribute handle
+struct AttributeDescription
+{
+    std::string path;
+    std::optional<uint8_t> dimension;
+    std::optional<attribute::AttributeType> type;
+
+
+    AttributeDescription() = default;
+    AttributeDescription(const AttributeDescription&) = default;
+    AttributeDescription(AttributeDescription&&) = default;
+    AttributeDescription& operator=(const AttributeDescription&) = default;
+    AttributeDescription& operator=(AttributeDescription&&) = default;
+    ~AttributeDescription() = default;
+
+    AttributeDescription(
+        const std::string_view& p,
+        const std::optional<uint8_t>& dim,
+        const std::optional<attribute::AttributeType>& t)
+        : path(p)
+        , dimension(dim)
+        , type(t)
+    {}
+
+    explicit AttributeDescription(
+        const std::string_view& p,
+        const std::optional<PrimitiveType>& pt,
+        const std::optional<attribute::AttributeType>& t)
+        : AttributeDescription(
+              p,
+              pt.has_value() ? std::optional<uint8_t>{wmtk::get_primitive_type_id(pt.value())}
+                             : std::optional<uint8_t>{},
+              t)
+    {}
+
+
+    std::optional<PrimitiveType> primitive_type() const;
+
+    auto operator<=>(const AttributeDescription&) const -> std::strong_ordering;
+    auto operator==(const AttributeDescription&) const -> bool;
+
+
+    WMTK_NLOHMANN_JSON_FRIEND_DECLARATION(AttributeDescription)
+};
+} // namespace wmtk::components::multimesh::utils

components/multimesh/src/wmtk/components/multimesh/utils/detail/attribute_ambiguous_error.cpp

@@ -0,0 +1,23 @@
+
+#include "attribute_ambiguous_error.hpp"
+#include <fmt/format.h>
+#include <fmt/ranges.h>
+#include <algorithm>
+#include <iterator>
+#include "named_error_text.hpp"
+namespace wmtk::components::multimesh::utils::detail {
+
+std::string attribute_ambiguous_error::make_message(
+    const AttributeDescription& ad,
+    const std::vector<AttributeDescription>& possibilities)
+{
+    std::vector<std::string> names;
+
+    std::string (*maker)(const AttributeDescription&) = make_named_error_string;
+    std::transform(possibilities.begin(), possibilities.end(), std::back_inserter(names), maker);
+    return fmt::format(
+        "Multiple options for an attribute {} found: [{}]",
+        make_named_error_string(ad),
+        fmt::join(names, ","));
+}
+} // namespace wmtk::components::multimesh::utils::detail

components/multimesh/src/wmtk/components/multimesh/utils/detail/attribute_ambiguous_error.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include "attribute_error.hpp"
+namespace wmtk::components::multimesh::utils {
+struct AttributeDescription;
+}
+
+namespace wmtk::components::multimesh::utils::detail {
+
+class attribute_ambiguous_error : public attribute_error
+{
+public:
+    static std::string make_message(
+        const AttributeDescription& description,
+        const std::vector<AttributeDescription>& possibilities);
+    attribute_ambiguous_error(
+        const AttributeDescription& d,
+        const std::vector<AttributeDescription>& possibilities)
+        : attribute_error(make_message(d, possibilities), d)
+    {}
+    template <typename... Args>
+    static attribute_ambiguous_error make(
+        const std::vector<AttributeDescription>& possiblities,
+        Args&&... args)
+    {
+        return attribute_ambiguous_error(
+            AttributeDescription{std::forward<Args>(args)...},
+            possiblities);
+    }
+};
+
+
+} // namespace wmtk::components::multimesh::utils::detail

components/multimesh/src/wmtk/components/multimesh/utils/detail/attribute_error.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <optional>
+#include <stdexcept>
+#include <wmtk/Primitive.hpp>
+#include <wmtk/attribute/AttributeType.hpp>
+#include "../AttributeDescription.hpp"
+
+namespace wmtk::components::multimesh::utils::detail {
+
+class attribute_error : public std::range_error
+{
+public:
+    template <typename... Args>
+    attribute_error(const std::string_view& message, Args&&... args)
+        : std::range_error(std::string(message))
+        , description(std::forward<Args>(args)...)
+    {}
+    AttributeDescription description;
+};
+} // namespace wmtk::components::multimesh::utils::detail

components/multimesh/src/wmtk/components/multimesh/utils/detail/attribute_missing_error.cpp

@@ -0,0 +1,9 @@
+#include "attribute_missing_error.hpp"
+#include "named_error_text.hpp"
+namespace wmtk::components::multimesh::utils::detail {
+
+std::string attribute_missing_error::make_message(const AttributeDescription& ad)
+{
+    return "Could not find attribute " + make_named_error_string(ad);
+}
+} // namespace wmtk::components::multimesh::utils::detail

components/multimesh/src/wmtk/components/multimesh/utils/detail/attribute_missing_error.hpp

@@ -0,0 +1,24 @@
+#pragma once
+#include "attribute_error.hpp"
+namespace wmtk::components::multimesh::utils {
+struct AttributeDescription;
+}
+
+namespace wmtk::components::multimesh::utils::detail {
+
+class attribute_missing_error : public attribute_error
+{
+public:
+    static std::string make_message(const AttributeDescription& description);
+    attribute_missing_error(const AttributeDescription& d)
+        : attribute_error(make_message(d), d)
+    {}
+    template <typename... Args>
+    static attribute_missing_error make(Args&&... args)
+    {
+        return attribute_missing_error(AttributeDescription{std::forward<Args>(args)...});
+    }
+};
+
+
+} // namespace wmtk::components::multimesh::utils::detail