Fixed memory leak issue caused by incorrect deallocation order in the Json_Value destructor && Fixed issue where copy construction of read-only reference members in Json_Value failed to pass && Added read-only reference members for Json_Object and Json_Array && Added const qualifiers to methods that do not modify class members && Implemented JSON file parsing && Implemented JSON file export, supporting minified export and pretty print.

Inc/Json_Utilities.hpp

@@ -21,6 +21,23 @@ class Json_Value;  // Json 值（可以是数组、对象、字符串、浮点
  */
 std::string JsonFile_FormatCheck(const char *path_to_file);
 
+/**
+ * @brief 解析Json文件
+ * @param path_to_file 文件路径串
+ * @param pJson_Value Value 指针
+ * @return std::string 错误值
+ */
+std::string JsonFile_Parse(const char *path_to_file, Json_Value *pJson_Value);
+
+/**
+ * @brief Json对象保存
+ * @param path_to_file 文件路径串
+ * @param value Json Value
+ * @param enable_pretty_print 启用美观打印
+ * @return std::string 错误值
+ */
+std::string Json_Export(const char *path_to_file, Json_Value value, bool enable_pretty_print = true);
+
 // Json 数组
 class Json_Arry
 {
@@ -29,6 +46,9 @@ private:
     std::vector<Json_Value> private_element_list;
 
 public:
+    // 只读引用
+    const std::vector<Json_Value> &element_list = this->private_element_list;
+
     // 默认构造
     Json_Arry() = default;
     // 列表构造
@@ -38,12 +58,12 @@ public:
     // 深拷贝
     Json_Arry &operator=(const Json_Arry &another);
     // 获取元素大小
-    size_t size(void);
+    size_t size(void) const;
     // 数组索引重载
-    Json_Value operator[](size_t index);
+    Json_Value operator[](size_t index) const;
 
     // 是否为空
-    bool isNull(void);
+    bool isNull(void) const;
 };
 
 // Json 值定义
@@ -92,15 +112,15 @@ public:
     ~Json_Value();
 
     // 获取值
-    std::string asString(void);
-    Json_Arry asArry(void);
-    Json_Object asObject(void);
-    int64_t asInteger(void);
-    double asFloat(void);
-    bool asBoolean(void);
+    std::string asString(void) const;
+    Json_Arry asArry(void) const;
+    Json_Object asObject(void) const;
+    int64_t asInteger(void) const;
+    double asFloat(void) const;
+    bool asBoolean(void) const;
 
     // 是否为空
-    bool isNull(void);
+    bool isNull(void) const;
 };
 
 // Json 键值对定义
@@ -126,7 +146,7 @@ public:
     Json_Pair &operator=(const Json_Pair &another);
 
     // 空判定
-    bool isNull();
+    bool isNull() const;
 };
 
 // Json 对象
@@ -137,6 +157,9 @@ private:
     std::vector<Json_Pair> private_element_list;
 
 public:
+    // 只读引用
+    std::vector<Json_Pair> const &element_list = this->private_element_list;
+
     // 默认构造
     Json_Object() = default;
     // 列表构造
@@ -147,15 +170,15 @@ public:
     Json_Object &operator=(const Json_Object &another);
 
     // 获取元素大小
-    size_t size(void);
+    size_t size(void) const;
     // 数组索引重载
-    Json_Pair operator[](size_t index);
+    Json_Pair operator[](size_t index) const;
 
     // 由Key 查找值
-    Json_Value get(std::string key);
+    Json_Value get(std::string key) const;
 
     // 是否为空
-    bool isNull(void);
+    bool isNull(void) const;
 };
 
 #endif

Src/Json_Utilities.cpp

@@ -4,6 +4,7 @@ extern "C"
 {
 #include "stdio.h"
 #include "stdlib.h"
+#include "string.h"
 }
 
 #include "functional"
@@ -211,14 +212,13 @@ std::string JsonFile_FormatCheck(const char *path_to_file)
             column_count++;
             switch (ch_get)
             {
-            case EOF:
-                return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
             case '\r':
             case ',':
             case '}':
             case ']':
                 column_count--;
                 fseek(pFile, -1, SEEK_CUR);
+            case EOF:
             case ' ':
             case '\n':
                 segment_finish = true;
@@ -385,7 +385,8 @@ std::string JsonFile_FormatCheck(const char *path_to_file)
         err_str = std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
         break;
     default:
-        err_str = std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Syntax error. Must begin with '{' or '['.";
+        fseek(pFile, -1, SEEK_CUR);
+        err_str = Check_Value();
     }
 
     // 关闭文件
@@ -393,6 +394,417 @@ std::string JsonFile_FormatCheck(const char *path_to_file)
     return err_str;
 }
 
+/**
+ * @brief 解析Json文件
+ * @param path_to_file 文件路径串
+ * @param pJson_Value Value 指针
+ * @return std::string 错误值
+ */
+std::string JsonFile_Parse(const char *path_to_file, Json_Value *pJson_Value)
+{
+    // 存在格式错误时返回NULL值,通过格式检查时信任后续的输入
+    std::string err_str = JsonFile_FormatCheck(path_to_file);
+    if (!err_str.empty())
+        return err_str;
+
+    // 尝试打开文件
+    FILE *pFile = fopen(path_to_file, "rb");
+    if (pFile == nullptr)
+        return "file \"" + std::string(path_to_file) + "\" open failed.";
+
+    // 跳过空白部分 return -> skip count
+    auto Lambda_skip_blank = [&](void) -> size_t
+    {
+        size_t read_count = 0;
+        while (true)
+        {
+            switch (fgetc(pFile))
+            {
+            case EOF:
+                return read_count;
+            case ' ':
+                read_count++;
+                break;
+            case '\r':
+                if (fgetc(pFile) == '\n')
+                {
+                    read_count += 2;
+                }
+                else
+                {
+                    fseek(pFile, -2, SEEK_CUR);
+                    return read_count;
+                }
+                break;
+            case '\n':
+                read_count++;
+                break;
+            default:
+                fseek(pFile, -1, SEEK_CUR);
+                return read_count;
+            }
+        }
+    };
+
+    // 函数封装
+    std::function<Json_Object(void)> Parse_Object;
+    std::function<Json_Value(void)> Parse_Value;
+    std::function<Json_Arry(void)> Parse_Arry;
+    std::function<Json_Pair(void)> Parse_Pair;
+
+    // 函数定义
+    Parse_Object = [&](void) -> Json_Object
+    {
+        Json_Object temp_obj;
+        Lambda_skip_blank();
+
+        // 拿掉第一个 '{'
+        char ch_get = fgetc(pFile);
+
+        while (true)
+        {
+            Lambda_skip_blank();
+            ch_get = fgetc(pFile);
+
+            switch (ch_get)
+            {
+            case '}':
+                return temp_obj;
+            case '\"':
+                fseek(pFile, -1, SEEK_CUR);
+                {
+                    std::vector<Json_Pair> pair_list = temp_obj.element_list;
+                    pair_list.push_back(Parse_Pair());
+                    temp_obj = Json_Object(pair_list);
+                }
+                break;
+            default:
+                break;
+            }
+        }
+    };
+
+    Parse_Value = [&](void) -> Json_Value
+    {
+        Lambda_skip_blank();
+
+        bool is_string = false;
+        char ch_get = fgetc(pFile);
+
+        // 判定第一个字符
+        switch (ch_get)
+        {
+        case '\"':
+            is_string = true;
+            break;
+        case '{':
+            fseek(pFile, -1, SEEK_CUR);
+            return Parse_Object();
+        case '[':
+            fseek(pFile, -1, SEEK_CUR);
+            return Parse_Arry();
+        default:
+            break;
+        }
+
+        // 判定为字符串
+        if (is_string)
+        {
+            std::string value_str;
+            while (true)
+            {
+                ch_get = fgetc(pFile);
+
+                switch (ch_get)
+                {
+                case '\"':
+                    return value_str;
+                case '\\': // 转义符
+                    ch_get = fgetc(pFile);
+                    value_str.push_back('\\');
+                    value_str.push_back(ch_get);
+                    break;
+                default:
+                    value_str.push_back(ch_get);
+                    continue;
+                }
+            }
+        }
+        else
+            fseek(pFile, -1, SEEK_CUR);
+
+        // 识别非字符串类型Json值
+        std::string segment_read;
+        while (true)
+        {
+            bool segment_finish = false;
+
+            ch_get = fgetc(pFile);
+            switch (ch_get)
+            {
+            case '\r':
+            case ',':
+            case '}':
+            case ']':
+                fseek(pFile, -1, SEEK_CUR);
+            case EOF:
+            case ' ':
+            case '\n':
+                segment_finish = true;
+                break;
+            default:
+                segment_read += ch_get;
+            }
+
+            if (segment_finish)
+                break;
+        }
+
+        // 逻辑值识别
+        if (segment_read == "true")
+            return true;
+        if (segment_read == "false")
+            return false;
+        if (segment_read == "null")
+            return Json_Value();
+
+        // 数值识别
+        if (strstr(segment_read.c_str(), "e") || strstr(segment_read.c_str(), "."))
+            return strtod(segment_read.c_str(), nullptr);
+        else
+            return strtoll(segment_read.c_str(), nullptr, 0);
+    };
+
+    Parse_Arry = [&](void) -> Json_Arry
+    {
+        Lambda_skip_blank();
+
+        // 拿掉第一个 '['
+        char ch_get = fgetc(pFile);
+
+        std::vector<Json_Value> value_list;
+        while (true)
+        {
+            Lambda_skip_blank();
+            ch_get = fgetc(pFile);
+
+            switch (ch_get)
+            {
+            case ']':
+                return value_list;
+            case ',':
+                break;
+            default:
+                fseek(pFile, -1, SEEK_CUR);
+                value_list.push_back(Parse_Value());
+            }
+        }
+    };
+
+    Parse_Pair = [&](void) -> Json_Pair
+    {
+        std::string key_str;
+        Lambda_skip_blank();
+
+        // 拿掉第一个 '\"'
+        char ch_get = fgetc(pFile);
+
+        // 遍历下一个引号
+        bool key_end = false;
+        while (true)
+        {
+            ch_get = fgetc(pFile);
+
+            switch (ch_get)
+            {
+            case '\"':
+                key_end = true;
+                break;
+            default:
+                key_str.push_back(ch_get);
+                break;
+            }
+
+            if (key_end)
+                break;
+        }
+
+        // 拿掉键值对标记
+        Lambda_skip_blank();
+        ch_get = fgetc(pFile);
+
+        // 返回键值对
+        return Json_Pair(key_str, Parse_Value());
+    };
+
+    // 跳过空白检查第一个字符
+    Lambda_skip_blank();
+    switch (fgetc(pFile))
+    {
+    case '[':
+        fseek(pFile, -1, SEEK_CUR);
+        *pJson_Value = Parse_Arry();
+        break;
+    case '{':
+        fseek(pFile, -1, SEEK_CUR);
+        *pJson_Value = Parse_Object();
+        break;
+    default:
+        fseek(pFile, -1, SEEK_CUR);
+        *pJson_Value = Parse_Value();
+        break;
+    }
+
+    fclose(pFile);
+    return std::string();
+}
+
+/**
+ * @brief Json对象保存
+ * @param path_to_file 文件路径串
+ * @param value Json Value
+ * @param enable_pretty_print 启用美观打印
+ * @return std::string 错误值
+ */
+std::string Json_Export(const char *path_to_file, Json_Value value, bool enable_pretty_print)
+{
+    // 打开文件
+    FILE *pFile = fopen(path_to_file, "wb");
+    if (pFile == nullptr)
+    {
+        fclose(pFile);
+        return "file \"" + std::string(path_to_file) + "\" open failed.";
+    }
+    // 函数封装
+    std::function<void(const Json_Object &, size_t, bool)> Export_Object;
+    std::function<void(const Json_Value &, size_t, bool)> Export_Value;
+    std::function<void(const Json_Arry &, size_t, bool)> Export_Arry;
+    std::function<void(const Json_Pair &, size_t)> Export_Pair;
+
+    // 函数定义
+    Export_Object = [&](const Json_Object &obj, size_t depth, bool first_line_indent)
+    {
+        // 首行缩进
+        if (enable_pretty_print && first_line_indent)
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+
+        // 对象起始
+        fprintf(pFile, "{");
+        if (enable_pretty_print && (!obj.isNull()))
+            fprintf(pFile, "\r\n");
+
+        // 输出键值对
+        for (auto pair : obj.element_list)
+        {
+            Export_Pair(pair, depth + 1);
+            fprintf(pFile, enable_pretty_print ? ",\r\n" : ",");
+        }
+        if (!obj.isNull())
+        {
+            fseek(pFile, enable_pretty_print ? -3 : -1, SEEK_CUR);
+            if (enable_pretty_print)
+                fprintf(pFile, "\r\n");
+        }
+
+        // 尾部缩进
+        if (enable_pretty_print && (!obj.isNull()))
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+
+        // 对象结束
+        fprintf(pFile, "}");
+    };
+
+    Export_Value = [&](const Json_Value &value, size_t depth, bool indent)
+    {
+        if (enable_pretty_print && indent)
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+        switch (value.type)
+        {
+        case Json_Value::TYPE_NULL: // 空值
+            fprintf(pFile, "null");
+            break;
+        case Json_Value::TYPE_STR: // 字符串
+            fprintf(pFile, "\"%s\"", value.asString().c_str());
+            break;
+        case Json_Value::TYPE_ARRY: // 数组
+            Export_Arry(value.asArry(), depth, false);
+            break;
+        case Json_Value::TYPE_OBJ: // 对象
+            Export_Object(value.asObject(), depth, false);
+            break;
+        case Json_Value::TYPE_NUM_INTEGER: // 整数常数
+            fprintf(pFile, "%lld", value.asInteger());
+            break;
+        case Json_Value::TYPE_NUM_FLOAT: // 浮点常数
+            fprintf(pFile, "%e", value.asFloat());
+            break;
+        case Json_Value::TYPE_BOOLEAN: // 布尔逻辑值
+            if (value.asBoolean() == true)
+                fprintf(pFile, "true");
+            else
+                fprintf(pFile, "false");
+        }
+    };
+
+    Export_Pair = [&](const Json_Pair &pair, size_t depth)
+    {
+        if (enable_pretty_print)
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+
+        fprintf(pFile, "\"%s\":", pair.key.c_str());
+        if (enable_pretty_print)
+            fprintf(pFile, " ");
+        Export_Value(pair.value, depth, false);
+    };
+
+    Export_Arry = [&](const Json_Arry &arry, size_t depth, bool first_line_indent)
+    {
+        // 首行缩进
+        if (enable_pretty_print && first_line_indent)
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+
+        // 数组起始
+        fprintf(pFile, "[");
+        if (enable_pretty_print && (!arry.isNull()))
+            fprintf(pFile, "\r\n");
+
+        // 输出数组数值
+        for (auto value : arry.element_list)
+        {
+            Export_Value(value, depth + 1, true);
+            fprintf(pFile, enable_pretty_print ? ",\r\n" : ",");
+        }
+        if (!arry.isNull())
+        {
+            fseek(pFile, enable_pretty_print ? -3 : -1, SEEK_CUR);
+            if (enable_pretty_print)
+                fprintf(pFile, "\r\n");
+        }
+        // 尾部缩进
+        if (enable_pretty_print && (!value.isNull()))
+            for (size_t count = 0; count < depth; count++)
+                fprintf(pFile, "    ");
+
+        // 对象结束
+        fprintf(pFile, "]");
+    };
+
+    if (value.type == Json_Value::TYPE_OBJ)
+        Export_Object(value.asObject(), 0, false);
+    else if (value.type == Json_Value::TYPE_ARRY)
+        Export_Arry(value.asArry(), 0, false);
+    else
+        Export_Value(value, 0, false);
+
+    fclose(pFile);
+    return std::string();
+}
+
 // std::string 构造
 Json_Value::Json_Value(std::string str) : private_type(TYPE_STR), p_mem(malloc(sizeof(str)))
 {
@@ -469,17 +881,26 @@ Json_Value &Json_Value::operator=(const Json_Value &another)
         case TYPE_STR:
             this->p_mem = malloc(sizeof(std::string));
             if (this->p_mem != nullptr)
-                new (this->p_mem) std::string(*((std::string *)another.p_mem));
+            {
+                new (this->p_mem) std::string();
+                *((std::string *)this->p_mem) = *((std::string *)another.p_mem);
+            }
             break;
         case TYPE_ARRY:
             this->p_mem = malloc(sizeof(Json_Arry));
             if (this->p_mem != nullptr)
-                new (this->p_mem) Json_Arry(*((Json_Arry *)another.p_mem));
+            {
+                new (this->p_mem) Json_Arry();
+                *((Json_Arry *)this->p_mem) = *((Json_Arry *)another.p_mem);
+            }
             break;
         case TYPE_OBJ:
             this->p_mem = malloc(sizeof(Json_Object));
             if (this->p_mem != nullptr)
-                new (this->p_mem) Json_Object(*((Json_Object *)another.p_mem));
+            {
+                new (this->p_mem) Json_Object();
+                *((Json_Object *)this->p_mem) = *((Json_Object *)another.p_mem);
+            }
             break;
         case TYPE_NUM_INTEGER:
             this->p_mem = malloc(sizeof(int64_t));
@@ -507,12 +928,10 @@ Json_Value &Json_Value::operator=(const Json_Value &another)
 // 析构
 Json_Value::~Json_Value()
 {
-    this->private_type = TYPE_NULL;
-
     if (this->p_mem != nullptr)
     {
         // 对象析构
-        switch (this->type)
+        switch (this->private_type)
         {
         case TYPE_STR:
             ((std::string *)p_mem)->~basic_string();
@@ -530,10 +949,11 @@ Json_Value::~Json_Value()
         // 释放内存
         free(p_mem);
     }
+    this->private_type = TYPE_NULL;
 }
 
 // 作为直接值获取
-std::string Json_Value::asString(void)
+std::string Json_Value::asString(void) const
 {
     if (this->type == TYPE_STR)
         return *(std::string *)this->p_mem;
@@ -542,7 +962,7 @@ std::string Json_Value::asString(void)
 }
 
 // 作为 Json_Arry 获取
-Json_Arry Json_Value::asArry(void)
+Json_Arry Json_Value::asArry(void) const
 {
     if (this->type == TYPE_ARRY)
         return *(Json_Arry *)this->p_mem;
@@ -551,7 +971,7 @@ Json_Arry Json_Value::asArry(void)
 }
 
 // 作为 Json_Object 获取
-Json_Object Json_Value::asObject(void)
+Json_Object Json_Value::asObject(void) const
 {
     if (this->type == TYPE_OBJ)
         return *(Json_Object *)this->p_mem;
@@ -560,7 +980,7 @@ Json_Object Json_Value::asObject(void)
 }
 
 // 作为 int64 获取
-int64_t Json_Value::asInteger(void)
+int64_t Json_Value::asInteger(void) const
 {
     if (this->type == TYPE_NUM_INTEGER)
         return *(int64_t *)this->p_mem;
@@ -569,7 +989,7 @@ int64_t Json_Value::asInteger(void)
 }
 
 // 作为 double 获取
-double Json_Value::asFloat(void)
+double Json_Value::asFloat(void) const
 {
     if (this->type == TYPE_NUM_FLOAT)
         return *(double *)this->p_mem;
@@ -578,7 +998,7 @@ double Json_Value::asFloat(void)
 }
 
 // 作为 Boolean 逻辑值获取
-bool Json_Value::asBoolean(void)
+bool Json_Value::asBoolean(void) const
 {
     if (this->type == TYPE_BOOLEAN)
         return *(bool *)this->p_mem;
@@ -587,7 +1007,7 @@ bool Json_Value::asBoolean(void)
 }
 
 // 是否为空
-bool Json_Value::isNull(void)
+bool Json_Value::isNull(void) const
 {
     return (this->private_type == TYPE_NULL);
 }
@@ -614,7 +1034,7 @@ Json_Pair &Json_Pair::operator=(const Json_Pair &another)
 }
 
 // 空判定
-bool Json_Pair::isNull()
+bool Json_Pair::isNull() const
 {
     return this->Null_Flag;
 }
@@ -633,13 +1053,13 @@ Json_Arry &Json_Arry::operator=(const Json_Arry &another)
 }
 
 // 获取元素大小
-size_t Json_Arry::size(void)
+size_t Json_Arry::size(void) const
 {
     return this->private_element_list.size();
 }
 
 // 数组索引重载
-Json_Value Json_Arry::operator[](size_t index)
+Json_Value Json_Arry::operator[](size_t index) const
 {
     if (index < this->private_element_list.size())
         return this->private_element_list[index];
@@ -648,7 +1068,7 @@ Json_Value Json_Arry::operator[](size_t index)
 }
 
 // 是否为空
-bool Json_Arry::isNull(void)
+bool Json_Arry::isNull(void) const
 {
     return (this->private_element_list.size() == 0);
 }
@@ -667,13 +1087,13 @@ Json_Object &Json_Object::operator=(const Json_Object &another)
 }
 
 // 获取元素大小
-size_t Json_Object::size(void)
+size_t Json_Object::size(void) const
 {
     return this->private_element_list.size();
 }
 
 // 数组索引重载
-Json_Pair Json_Object::operator[](size_t index)
+Json_Pair Json_Object::operator[](size_t index) const
 {
     if (index < this->private_element_list.size())
         return this->private_element_list[index];
@@ -682,7 +1102,7 @@ Json_Pair Json_Object::operator[](size_t index)
 }
 
 // 由Key 查找值
-Json_Value Json_Object::get(std::string key)
+Json_Value Json_Object::get(std::string key) const
 {
     for (auto pair : this->private_element_list)
         if (pair.key == key)
@@ -692,7 +1112,7 @@ Json_Value Json_Object::get(std::string key)
 }
 
 // 是否为空
-bool Json_Object::isNull(void)
+bool Json_Object::isNull(void) const
 {
     return (this->private_element_list.size() == 0);
 }