From 570172c86dc7e654729722caab79d71f6f906c8f Mon Sep 17 00:00:00 2001
From: DualFroz <me@dualfroz.com>
Date: Mon, 7 Sep 2026 10:23:01 +0200
Subject: [PATCH] feat: add endsWith and splitDataPath

---
 core/src/DataPack.cpp | 159 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 core/src/DataPack.cpp

diff --git a/core/src/DataPack.cpp b/core/src/DataPack.cpp
new file mode 100644
index 0000000..cfcfd3e
--- /dev/null
+++ b/core/src/DataPack.cpp
@@ -0,0 +1,159 @@
+#include "vf/DataPack.h"
+
+#include <algorithm>
+#include <cctype>
+
+#include "vf/Command.h"
+
+namespace vf {
+
+namespace {
+
+const char* const knownFolders[] = {"recipes", "lootTables", "tags/blocks", "tags/items",
+                                    "advancements"};
+
+std::string loweredWithoutSeparators(const std::string& text) {
+    std::string out;
+    out.reserve(text.size());
+    for (char c : text) {
+        if (c == '_' || c == '-') continue;
+        out.push_back(static_cast<char>(std::tolower(static_cast<unsigned char>(c))));
+    }
+    return out;
+}
+
+bool endsWith(const std::string& text, const std::string& suffix) {
+    return text.size() >= suffix.size() &&
+           text.compare(text.size() - suffix.size(), suffix.size(), suffix) == 0;
+}
+
+bool splitDataPath(const std::string& file, std::string& space, std::string& folder,
+                   std::string& name) {
+    const std::string root = "data/";
+    if (file.compare(0, root.size(), root) != 0) return false;
+    std::size_t spaceEnd = file.find('/', root.size());
+    if (spaceEnd == std::string::npos) return false;
+    space = file.substr(root.size(), spaceEnd - root.size());
+    std::string rest = file.substr(spaceEnd + 1u);
+    if (!endsWith(rest, ".json")) return false;
+    rest = rest.substr(0, rest.size() - 5u);
+
+    std::string bestFolder;
+    for (const char* candidate : knownFolders) {
+        std::string prefix = std::string(candidate) + "/";
+        if (rest.compare(0, prefix.size(), prefix) != 0 || rest.size() <= prefix.size()) continue;
+        if (bestFolder.size() < prefix.size() - 1u) bestFolder = candidate;
+    }
+    if (bestFolder.empty()) return false;
+    folder = bestFolder;
+    name = rest.substr(bestFolder.size() + 1u);
+    return !name.empty();
+}
+
+bool readResourceField(const JsonValue& owner, const std::string& key,
+                       const std::string& defaultSpace, ResourceId& out, std::string& problem) {
+    const JsonValue* field = owner.find(key);
+    if (field == nullptr || !field->isString()) {
+        problem = "\"" + key + "\" must be a resource id string";
+        return false;
+    }
+    if (!ResourceId::parse(field->stringValue(), defaultSpace, out)) {
+        problem = "\"" + key + "\" is not a valid resource id: " + field->stringValue();
+        return false;
+    }
+    return true;
+}
+
+bool readItemField(const JsonValue& owner, const std::string& key, const std::string& defaultSpace,
+                   ItemId& out, std::string& problem) {
+    ResourceId id;
+    if (!readResourceField(owner, key, defaultSpace, id, problem)) return false;
+    if (!resolveItemId(id, out)) {
+        problem = "no such item: " + id.text();
+        return false;
+    }
+    return true;
+}
+
+struct NamedFlag {
+    const char* name;
+    uint32_t bit;
+};
+
+const NamedFlag lootConditionFlags[] = {
+    {"playerKill", LootEntry::PlayerKill},
+    {"fiery", LootEntry::Fiery},
+    {"notFiery", LootEntry::NotFiery},
+    {"silkTouched", LootEntry::SilkTouched},
+    {"notSilkTouched", LootEntry::NotSilkTouched},
+    {"needsLooting", LootEntry::NeedsLooting},
+    {"needsFortune", LootEntry::NeedsFortune},
+    {"explosive", LootEntry::Explosive},
+    {"ranged", LootEntry::Ranged},
+};
+
+const NamedFlag lootFunctionFlags[] = {
+    {"countRange", LootEntry::CountRange},
+    {"oreFortune", LootEntry::OreFortune},
+    {"lootingBonus", LootEntry::LootingBonus},
+    {"chanceLooting", LootEntry::ChanceLooting},
+    {"chanceFortune", LootEntry::ChanceFortune},
+    {"smeltIfFiery", LootEntry::SmeltIfFiery},
+};
+
+bool readFlagList(const JsonValue& owner, const std::string& key, const NamedFlag* table,
+                  std::size_t tableSize, uint32_t& out, std::string& problem) {
+    const JsonValue* list = owner.find(key);
+    if (list == nullptr) return true;
+    if (!list->isArray()) {
+        problem = "\"" + key + "\" must be an array of names";
+        return false;
+    }
+    for (const JsonValue& element : list->elements()) {
+        if (!element.isString()) {
+            problem = "\"" + key + "\" holds a non string entry";
+            return false;
+        }
+        bool matched = false;
+        for (std::size_t i = 0u; i < tableSize; ++i) {
+            if (element.stringValue() == table[i].name) {
+                out |= table[i].bit;
+                matched = true;
+                break;
+            }
+        }
+        if (!matched) {
+            problem = "unknown " + key + " name: " + element.stringValue();
+            return false;
+        }
+    }
+    return true;
+}
+
+bool readCountRange(const JsonValue& owner, const std::string& key, int& minOut, int& maxOut,
+                    std::string& problem) {
+    const JsonValue* field = owner.find(key);
+    if (field == nullptr) return true;
+    if (field->isNumber()) {
+        minOut = static_cast<int>(field->intValue());
+        maxOut = minOut;
+    } else if (field->isObject()) {
+        minOut = static_cast<int>(field->intOr("min", minOut));
+        maxOut = static_cast<int>(field->intOr("max", minOut));
+    } else {
+        problem = "\"" + key + "\" must be a number or a {min,max} object";
+        return false;
+    }
+    if (minOut > maxOut) {
+        problem = "\"" + key + "\" has min above max";
+        return false;
+    }
+    if (minOut < 0) {
+        problem = "\"" + key + "\" cannot be negative";
+        return false;
+    }
+    return true;
+}
+
+} // namespace
+