1 files changed, 207 insertions, 0 deletions

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+#include "godot_scene.h"
+
+#include <fstream>
+#include <sstream>
+#include <string_view>
+#include <variant>
+
+namespace com::fourisland::lingo2_archipelago {
+
+namespace {
+
+struct Heading {
+  std::string type;
+
+  std::string id;
+  std::string path;
+  std::string resource_type;
+
+  std::string name;
+  std::string parent;
+  GodotInstanceType instance_type;
+};
+
+Heading ParseTscnHeading(std::string_view line) {
+  std::string original_line(line);
+  Heading heading;
+
+  if (line[0] != '[') {
+    std::ostringstream errormsg;
+    errormsg << "Heading must start with [." << std::endl
+             << "Bad heading: " << original_line;
+    throw std::invalid_argument(errormsg.str());
+  }
+
+  line.remove_prefix(1);
+  int divider = line.find_first_of(" ]");
+  if (divider == std::string_view::npos) {
+    std::ostringstream errormsg;
+    errormsg << "Malformatted heading: " << line << std::endl
+             << "Original line: " << original_line;
+    throw std::invalid_argument(errormsg.str());
+  }
+
+  heading.type = std::string(line.substr(0, divider));
+  line.remove_prefix(divider + 1);
+
+  while (!line.empty()) {
+    divider = line.find_first_of("=");
+    if (divider == std::string_view::npos) {
+      std::ostringstream errormsg;
+      errormsg << "Malformatted heading: " << line << std::endl
+               << "Original line: " << original_line;
+      throw std::invalid_argument(errormsg.str());
+    }
+
+    std::string key(line.substr(0, divider));
+    line.remove_prefix(divider + 1);
+
+    if (line[0] == '"') {
+      line.remove_prefix(1);
+      divider = line.find_first_of("\"");
+
+      if (divider == std::string_view::npos) {
+        std::ostringstream errormsg;
+        errormsg << "Malformatted heading: " << line << std::endl
+                 << "Original line: " << original_line;
+        throw std::invalid_argument(errormsg.str());
+      }
+
+      std::string strval(line.substr(0, divider));
+      line.remove_prefix(divider + 2);
+
+      if (key == "name") {
+        heading.name = strval;
+      } else if (key == "parent") {
+        heading.parent = strval;
+      } else if (key == "path") {
+        heading.path = strval;
+      } else if (key == "type") {
+        heading.resource_type = strval;
+      } else if (key == "id") {
+        heading.id = strval;
+      }
+    } else if (line[0] == 'S' || line[0] == 'E') {
+      GodotInstanceType rrval;
+      char internal = line[0];
+
+      line.remove_prefix(13);  // SubResource("
+      divider = line.find_first_of("\"");
+
+      if (divider == std::string_view::npos) {
+        std::ostringstream errormsg;
+        errormsg << "Malformatted heading: " << line << std::endl
+                 << "Original line: " << original_line;
+        throw std::invalid_argument(errormsg.str());
+      }
+
+      std::string refid = std::string(line.substr(0, divider));
+      line.remove_prefix(divider + 3);
+
+      GodotInstanceType instance_type;
+      if (internal == 'E') {
+        instance_type = GodotExtResourceRef{.id = refid};
+      } else {
+        // SubResource is not supported right now.
+      }
+
+      if (key == "instance") {
+        heading.instance_type = instance_type;
+      } else {
+        // Other keys aren't supported right now.
+      }
+    } else {
+      divider = line.find_first_of(" ]");
+
+      if (divider == std::string_view::npos) {
+        std::ostringstream errormsg;
+        errormsg << "Malformatted heading: " << line << std::endl
+                 << "Original line: " << original_line;
+        throw std::invalid_argument(errormsg.str());
+      }
+
+      int numval = std::atoi(line.substr(0, divider).data());
+      line.remove_prefix(divider + 1);
+
+      // keyvals_[key] = numval;
+    }
+  }
+
+  return heading;
+}
+
+}  // namespace
+
+std::string GodotNode::GetPath() const {
+  if (parent.empty() || parent == ".") {
+    return name;
+  } else {
+    return parent + "/" + name;
+  }
+}
+
+GodotScene ReadGodotSceneFromFile(const std::string& path) {
+  std::map<std::string, GodotExtResource> ext_resources;
+  std::vector<GodotNode> nodes;
+
+  std::ifstream input(path);
+
+  std::string line;
+  bool section_started = false;
+  Heading cur_heading;
+  std::ostringstream cur_value;
+  bool value_started = false;
+  auto handle_end_of_section = [&]() {
+    section_started = false;
+    value_started = false;
+
+    if (cur_heading.type == "sub_resource") {
+      // sub_resources_[std::get<int>(cur_heading.GetKeyval("id"))] =
+      // {cur_heading, cur_value.str(), ""};
+    } else {
+      // other_.emplace_back(cur_heading, cur_value.str());
+    }
+
+    cur_value = {};
+  };
+  while (std::getline(input, line)) {
+    if (section_started && (line.empty() || line[0] == '[')) {
+      handle_end_of_section();
+    }
+    if (!line.empty() && line[0] == '[') {
+      Heading heading = ParseTscnHeading(line);
+      if (heading.type == "gd_scene") {
+        // file_descriptor_ = heading;
+      } else if (heading.type == "ext_resource") {
+        GodotExtResource ext_resource;
+        ext_resource.path = heading.path;
+        ext_resource.type = heading.resource_type;
+
+        ext_resources[heading.id] = ext_resource;
+      } else if (heading.type == "node") {
+        if (heading.parent != "") {
+          nodes.push_back(GodotNode{.name = heading.name,
+                                    .parent = heading.parent,
+                                    .instance_type = heading.instance_type});
+        }
+      } else {
+        cur_heading = heading;
+        section_started = true;
+      }
+    } else if (!line.empty()) {
+      if (value_started) {
+        cur_value << std::endl;
+      } else {
+        value_started = true;
+      }
+      cur_value << line;
+    }
+  }
+  if (section_started) {
+    handle_end_of_section();
+  }
+
+  return GodotScene(std::move(ext_resources), std::move(nodes));
+}
+
+}  // namespace com::fourisland::lingo2_archipelago