refactor: nlohmann/json entegrasyonu — string birleştirme yerine nesne API

- src/vendor/nlohmann/json.hpp eklendi (single-header, MIT)
- SourceLocation  → toJsonObj() + toJson() (nlohmann)
- Type            → toJsonObj() + toJson() (nlohmann, özyinelemeli)
- Diagnostic      → toJsonObj() + toJson() (nlohmann)
- DiagnosticEngine→ toJsonObj() + toJson() (nlohmann)
- symbols.hpp     → tamamen nlohmann ile yeniden yazıldı

Tüm toJson() imzaları std::string döndürmeye devam eder;
AST JsonObject builder'ı dokunulmadı (ayrı katman).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

build/.ninja_log

@@ -1,20 +1,31 @@
 # ninja log v7
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src/cli/commands/symbols.hpp

@@ -6,70 +6,13 @@
 #define SAQUT_CLI_SYMBOLS
 
 #include <iostream>
-#include <sstream>
 #include "cli/args.hpp"
 #include "tokenizer/tokenizer.hpp"
 #include "parser/parser.hpp"
 #include "symbol/symbol_table.hpp"
 #include "symbol/symbol_collector.hpp"
 #include "diagnostic/diagnostic_engine.hpp"
-#include "tools.hpp"
+#include "vendor/nlohmann/json.hpp"
-
-// ─────────────────────────────────────────────────────────────────────────────
-// symbolsToJson — sembol tablosunu JSON olarak serileştir
-// ─────────────────────────────────────────────────────────────────────────────
-
-inline std::string symbolsToJson(const std::string& filePath,
-                                  const SymbolTable& table,
-                                  const DiagnosticEngine& diag) {
-    auto symbols = table.allSymbols();
-    std::ostringstream ss;
-
-    ss << "{\n";
-    ss << "  \"file\": \"" << jsonEscape(filePath) << "\",\n";
-    ss << "  \"symbols\": [";
-
-    bool firstSym = true;
-    for (Symbol* s : symbols) {
-        if (s->isBuiltin) continue;
-
-        if (!firstSym) ss << ",";
-        firstSym = false;
-
-        ss << "\n    {\n";
-        ss << "      \"name\": \""    << jsonEscape(s->name)              << "\",\n";
-        ss << "      \"kind\": \""    << symbolKindName(s->kind)           << "\",\n";
-        ss << "      \"type\": \""    << jsonEscape(s->type.toString())    << "\",\n";
-        ss << "      \"typeDetail\": " << s->type.toJson()                 << ",\n";
-        ss << "      \"definition\": " << s->definitionLoc.toJson()        << ",\n";
-        ss << "      \"isBuiltin\": "  << (s->isBuiltin ? "true" : "false") << ",\n";
-
-        // referanslar
-        ss << "      \"references\": [";
-        bool firstRef = true;
-        for (const SourceLocation& ref : s->references) {
-            if (!firstRef) ss << ", ";
-            firstRef = false;
-            ss << ref.toJson();
-        }
-        ss << "]\n";
-
-        ss << "    }";
-    }
-
-    if (!firstSym) ss << "\n  ";
-    ss << "],\n";
-
-    // tanılar (diagnostic engine'den hazır JSON al, iç kısmını sar)
-    ss << "  \"diagnostics\": " << diag.toJson() << "\n";
-    ss << "}\n";
-
-    return ss.str();
-}
-
-// ─────────────────────────────────────────────────────────────────────────────
-// cmdSymbols — giriş noktası
-// ─────────────────────────────────────────────────────────────────────────────
 
 inline int cmdSymbols(const CliArgs& args) {
     std::string filePath = inputFilePath(args);
@@ -82,21 +25,41 @@ inline int cmdSymbols(const CliArgs& args) {
     Parser parser;
     ASTNode* ast = parser.parse(tokens);
 
-    if (!ast) {
-        // AST null olursa boş ama geçerli bir JSON çıktısı üret
-        DiagnosticEngine diag;
-        diag.report("E000", SourceLocation{}, "AST üretilemedi");
-        SymbolTable empty;
-        std::cout << symbolsToJson(filePath, empty, diag);
-        for (auto* t : tokens) delete t;
-        return 1;
-    }
-
     SymbolTable table;
     DiagnosticEngine diag;
-    SymbolCollector(table, diag).collect(ast);
 
-    std::cout << symbolsToJson(filePath, table, diag);
+    if (ast) {
+        SymbolCollector(table, diag).collect(ast);
+    } else {
+        diag.report("E000", SourceLocation{}, "AST üretilemedi");
+    }
+
+    // ── JSON çıktı ──────────────────────────────────────────────────────────
+    nlohmann::json out;
+    out["file"] = filePath;
+
+    nlohmann::json symArray = nlohmann::json::array();
+    for (Symbol* s : table.allSymbols()) {
+        if (s->isBuiltin) continue;
+
+        nlohmann::json refs = nlohmann::json::array();
+        for (const SourceLocation& r : s->references)
+            refs.push_back(r.toJsonObj());
+
+        symArray.push_back({
+            {"name",       s->name},
+            {"kind",       symbolKindName(s->kind)},
+            {"type",       s->type.toString()},
+            {"typeDetail", s->type.toJsonObj()},
+            {"definition", s->definitionLoc.toJsonObj()},
+            {"references", refs},
+            {"isBuiltin",  s->isBuiltin}
+        });
+    }
+    out["symbols"]     = symArray;
+    out["diagnostics"] = diag.toJsonObj();
+
+    std::cout << out.dump(2) << "\n";
 
     delete ast;
     for (auto* t : tokens) delete t;

src/core/location.hpp

@@ -22,6 +22,7 @@
 #define SAQUT_CORE_LOCATION
 
 #include <string>
+#include "vendor/nlohmann/json.hpp"
 
 // ============================================================================
 // SourceLocation — Kaynak Koddaki Bir Nokta
@@ -66,15 +67,17 @@ struct SourceLocation {
     }
 
     // JSON formatı: {"file":"...","line":5,"column":10,"offset":134}
-    std::string toJson() const {
+    nlohmann::json toJsonObj() const {
-        if (!isValid()) return "null";
+        if (!isValid()) return nullptr;
-        return "{"
+        return {
-            "\"file\":\"" + filePath + "\","
+            {"file",   filePath},
-            "\"line\":" + std::to_string(line) + ","
+            {"line",   line},
-            "\"column\":" + std::to_string(column) + ","
+            {"column", column},
-            "\"offset\":" + std::to_string(offset) +
+            {"offset", offset}
-        "}";
+        };
     }
+
+    std::string toJson() const { return toJsonObj().dump(); }
 };
 
 #endif // SAQUT_CORE_LOCATION

src/core/type.hpp

@@ -34,6 +34,7 @@
 #include <string>
 #include <vector>
 #include <memory>
+#include "vendor/nlohmann/json.hpp"
 
 // ============================================================================
 // Enum'lar
@@ -220,31 +221,37 @@ struct Type {
     // ------------------------------------------------------------------ //
     // toJson — Makine-okur (cam ilkesi: her tip dışarıdan sorgulanabilir)
     // ------------------------------------------------------------------ //
-    std::string toJson() const {
+    nlohmann::json toJsonObj() const {
+        nlohmann::json j;
         switch (kind) {
             case TypeKind::Primitive:
-                return std::string("{\"kind\":\"primitive\",\"name\":\"") + primName(prim) + "\"}";
+                j["kind"] = "primitive";
+                j["name"] = primName(prim);
+                break;
             case TypeKind::Array:
-                return std::string("{\"kind\":\"array\",\"element\":") +
+                j["kind"]    = "array";
-                       (elementType ? elementType->toJson() : "null") + "}";
+                j["element"] = elementType ? elementType->toJsonObj() : nullptr;
+                break;
             case TypeKind::Struct:
-                return "{\"kind\":\"struct\",\"name\":\"" + structName + "\"}";
+                j["kind"] = "struct";
+                j["name"] = structName;
+                break;
             case TypeKind::Function: {
-                std::string s = "{\"kind\":\"function\",\"returns\":";
+                j["kind"]    = "function";
-                s += returnType ? returnType->toJson() : "null";
+                j["returns"] = returnType ? returnType->toJsonObj() : nullptr;
-                s += ",\"params\":[";
+                nlohmann::json params = nlohmann::json::array();
-                for (size_t i = 0; i < paramTypes.size(); ++i) {
+                for (const auto& p : paramTypes) params.push_back(p.toJsonObj());
-                    if (i) s += ",";
+                j["params"] = params;
-                    s += paramTypes[i].toJson();
+                break;
-                }
-                s += "]}";
-                return s;
             }
             case TypeKind::Error:
-                return "{\"kind\":\"error\"}";
+                j["kind"] = "error";
+                break;
         }
-        return "null";
+        return j;
     }
+
+    std::string toJson() const { return toJsonObj().dump(); }
 };
 
 #endif // SAQUT_CORE_TYPE

src/diagnostic/diagnostic.hpp

@@ -85,18 +85,17 @@ struct Diagnostic {
     std::string    message;  // bağlama özel açıklama
     std::string    hint;     // opsiyonel "şunu dene" önerisi
 
-    std::string toJson() const {
+    nlohmann::json toJsonObj() const {
-        std::string s = "{";
+        nlohmann::json j;
-        s += "\"level\":\"";   s += diagLevelName(level); s += "\",";
+        j["level"]    = diagLevelName(level);
-        s += "\"code\":\"";    s += jsonEscape(code);     s += "\",";
+        j["code"]     = code;
-        s += "\"location\":";  s += loc.toJson();         s += ",";
+        j["location"] = loc.toJsonObj();
-        s += "\"message\":\""; s += jsonEscape(message);  s += "\"";
+        j["message"]  = message;
-        if (!hint.empty()) {
+        if (!hint.empty()) j["hint"] = hint;
-            s += ",\"hint\":\""; s += jsonEscape(hint); s += "\"";
+        return j;
-        }
-        s += "}";
-        return s;
     }
+
+    std::string toJson() const { return toJsonObj().dump(); }
 };
 
 // ============================================================================

src/diagnostic/diagnostic_engine.hpp

@@ -25,6 +25,7 @@
 #include <vector>
 #include <ostream>
 #include "diagnostic/diagnostic.hpp"
+#include "vendor/nlohmann/json.hpp"
 
 // ============================================================================
 // DiagnosticEngine
@@ -88,18 +89,19 @@ public:
     }
 
     // --- Makine-okur çıktı ---
-    std::string toJson() const {
+    nlohmann::json toJsonObj() const {
-        std::string s = "{\"diagnostics\":[";
+        nlohmann::json items = nlohmann::json::array();
-        for (size_t i = 0; i < diagnostics_.size(); ++i) {
+        for (const auto& d : diagnostics_)
-            if (i) s += ",";
+            items.push_back(d.toJsonObj());
-            s += diagnostics_[i].toJson();
+        return {
-        }
+            {"diagnostics",  items},
-        s += "],\"errorCount\":" + std::to_string(errorCount());
+            {"errorCount",   errorCount()},
-        s += ",\"warningCount\":" + std::to_string(warningCount());
+            {"warningCount", warningCount()}
-        s += "}";
+        };
-        return s;
     }
 
+    std::string toJson() const { return toJsonObj().dump(); }
+
 private:
     std::vector<Diagnostic> diagnostics_;