Implemented a JSON file format checking function.
This commit is contained in:
parent
057438652a
commit
b11e74e815
@ -3,8 +3,6 @@
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extern "C"
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{
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#include "stdio.h"
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#include "stdlib.h"
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#include "stdint.h"
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}
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@ -16,6 +14,13 @@ class Json_Arry; // Json 数组 元素必须是值
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class Json_Object; // Json 对象 对象内必须是键值对序列
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class Json_Value; // Json 值（可以是数组、对象、字符串、浮点数值和整数值、逻辑值、NULL）
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/**
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* @brief Json文件 格式检查
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* @param path_to_file 文件路径串
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* @return std::string 错误值
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*/
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std::string JsonFile_FormatCheck(const char *path_to_file);
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// Json 数组
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class Json_Arry
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{
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@ -1,5 +1,398 @@
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#include "Json_Utilities.hpp"
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extern "C"
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{
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#include "stdio.h"
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#include "stdlib.h"
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}
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#include "functional"
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/**
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* @brief Json文件 格式检查
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* @param path_to_file 文件路径串
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* @return std::string 错误值
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*/
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std::string JsonFile_FormatCheck(const char *path_to_file)
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{
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// 尝试打开文件
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FILE *pFile = fopen(path_to_file, "rb");
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if (pFile == nullptr)
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return "file \"" + std::string(path_to_file) + "\" open failed.";
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// 行列计数
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size_t rol_count = 1;
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size_t column_count = 0;
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std::string err_str;
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// 跳过空白部分 return -> skip count
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auto Lambda_skip_blank = [&](void) -> size_t
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{
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size_t read_count = 0;
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while (true)
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{
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switch (fgetc(pFile))
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{
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case EOF:
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return read_count;
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case ' ':
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column_count++;
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read_count++;
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break;
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case '\r':
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if (fgetc(pFile) == '\n')
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{
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read_count += 2;
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rol_count++;
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column_count = 0;
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}
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else
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{
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fseek(pFile, -2, SEEK_CUR);
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return read_count;
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}
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break;
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case '\n':
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read_count++;
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rol_count++;
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column_count = 0;
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break;
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default:
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fseek(pFile, -1, SEEK_CUR);
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return read_count;
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}
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}
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};
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// 函数封装
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std::function<std::string(void)> Check_Object;
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std::function<std::string(void)> Check_Value;
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std::function<std::string(void)> Check_Arry;
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std::function<std::string(void)> Check_Pair;
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// 函数定义
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Check_Object = [&](void) -> std::string
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{
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Lambda_skip_blank();
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char ch_get = fgetc(pFile);
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if (ch_get != '{')
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{
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if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected '" + ch_get + "'.";
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}
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column_count++;
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while (true)
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{
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Lambda_skip_blank();
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ch_get = fgetc(pFile);
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column_count++;
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switch (ch_get)
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{
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case '}':
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return std::string();
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case '\"':
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fseek(pFile, -1, SEEK_CUR);
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column_count--;
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{
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std::string err_str = Check_Pair();
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if (!err_str.empty())
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return err_str;
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// 结束后读取段
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size_t now_rol_count = rol_count;
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size_t now_column_count = column_count;
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Lambda_skip_blank();
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char ch_get = fgetc(pFile);
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if ((ch_get != '}') && (ch_get != ','))
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{
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if (ch_get == ']')
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Missing '}'.";
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else if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Missing comma.";
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}
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fseek(pFile, -1, SEEK_CUR);
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}
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break;
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case ',':
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{
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size_t now_rol_count = rol_count;
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size_t now_column_count = column_count;
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Lambda_skip_blank();
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if (fgetc(pFile) != '\"')
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Unexpected ','.";
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fseek(pFile, -1, SEEK_CUR);
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break;
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}
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count - 1) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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default:
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected '" + ch_get + "'.";
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}
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}
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};
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Check_Value = [&](void) -> std::string
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{
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Lambda_skip_blank();
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size_t begin_rol = rol_count;
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size_t begin_column = column_count;
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bool is_string = false;
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char ch_get = fgetc(pFile);
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// 判定第一个字符
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switch (ch_get)
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{
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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case '\"':
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is_string = true;
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break;
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case '{':
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fseek(pFile, -1, SEEK_CUR);
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return Check_Object();
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case '[':
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fseek(pFile, -1, SEEK_CUR);
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return Check_Arry();
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default:
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break;
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}
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// 判定为字符串
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if (is_string)
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{
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column_count++;
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while (true)
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{
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ch_get = fgetc(pFile);
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column_count++;
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switch (ch_get)
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{
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case '\"':
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return std::string();
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case '\\': // 转义符
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ch_get = fgetc(pFile);
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if (ch_get != EOF)
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{
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column_count++;
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continue;
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}
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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case '\n':
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return std::string(path_to_file) + ':' + std::to_string(begin_rol) + ':' + std::to_string(begin_column) + ": Unfinished string.";
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default:
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continue;
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}
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}
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}
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else
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fseek(pFile, -1, SEEK_CUR);
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// 识别有效数值
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std::string segment_read;
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while (true)
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{
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bool segment_finish = false;
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ch_get = fgetc(pFile);
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column_count++;
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switch (ch_get)
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{
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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case '\r':
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case ',':
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case '}':
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case ']':
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column_count--;
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fseek(pFile, -1, SEEK_CUR);
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case ' ':
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case '\n':
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segment_finish = true;
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break;
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default:
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segment_read += ch_get;
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}
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if (segment_finish)
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break;
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}
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if ((segment_read == "true") || (segment_read == "false") || (segment_read == "null"))
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return std::string();
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// 数值识别
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{
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char *end_ptr;
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strtod(segment_read.c_str(), &end_ptr);
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// 未被完全转化、出现先导0、先导+、尾缀小数点时非法
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if ((size_t(end_ptr - segment_read.c_str()) < segment_read.size()) || ((segment_read.c_str()[0] == '0') && (segment_read.size() > 1)) || (segment_read.c_str()[0] == '+') || end_ptr[-1] == '.')
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return std::string(path_to_file) + ':' + std::to_string(begin_rol) + ':' + std::to_string(begin_column) + ": Invalid value \"" + segment_read + "\".";
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}
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return std::string();
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};
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Check_Arry = [&](void) -> std::string
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{
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Lambda_skip_blank();
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char ch_get = fgetc(pFile);
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if (ch_get != '[')
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{
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if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected '" + ch_get + "'.";
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}
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column_count++;
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while (true)
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{
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Lambda_skip_blank();
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ch_get = fgetc(pFile);
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column_count++;
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switch (ch_get)
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{
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case ']':
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return std::string();
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case ',':
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{
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size_t now_rol_count = rol_count;
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size_t now_column_count = column_count;
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Lambda_skip_blank();
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if (fgetc(pFile) == ']')
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Unexpected ','.";
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fseek(pFile, -1, SEEK_CUR);
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break;
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}
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count - 1) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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default:
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{
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column_count--;
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fseek(pFile, -1, SEEK_CUR);
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std::string err_str = Check_Value();
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if (!err_str.empty())
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return err_str;
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// 结束后读取段
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size_t now_rol_count = rol_count;
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size_t now_column_count = column_count;
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Lambda_skip_blank();
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char ch_get = fgetc(pFile);
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if ((ch_get != ',') && (ch_get != ']'))
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{
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if (ch_get == '}')
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Missing ']'.";
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else if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(now_rol_count) + ':' + std::to_string(now_column_count) + ": Missing comma.";
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}
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fseek(pFile, -1, SEEK_CUR);
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}
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}
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}
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};
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Check_Pair = [&](void) -> std::string
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{
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Lambda_skip_blank();
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char ch_get = fgetc(pFile);
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if (ch_get != '\"')
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{
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if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected '" + ch_get + "'.";
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}
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column_count++;
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// 遍历下一个引号
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bool key_end = false;
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while (true)
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{
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ch_get = fgetc(pFile);
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column_count++;
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switch (ch_get)
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{
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case '\"':
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key_end = true;
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break;
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case '\n':
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rol_count++;
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column_count = 0;
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break;
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case EOF:
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return std::string(path_to_file) + ':' + std::to_string(rol_count - 1) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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}
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if (key_end)
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break;
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}
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// 寻找键值对标记
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Lambda_skip_blank();
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ch_get = fgetc(pFile);
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if (ch_get != ':')
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{
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if (ch_get == EOF)
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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else
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return std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected '" + ch_get + "'. ':' is needed.";
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}
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column_count++;
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return Check_Value();
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};
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// 跳过空白检查第一个字符
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Lambda_skip_blank();
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switch (fgetc(pFile))
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{
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case '[':
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fseek(pFile, -1, SEEK_CUR);
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err_str = Check_Arry();
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break;
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case '{':
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fseek(pFile, -1, SEEK_CUR);
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err_str = Check_Object();
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break;
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case EOF:
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err_str = std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Unexpected EOF.";
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break;
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default:
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err_str = std::string(path_to_file) + ':' + std::to_string(rol_count) + ':' + std::to_string(column_count) + ": Syntax error. Must begin with '{' or '['.";
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}
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// 关闭文件
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fclose(pFile);
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return err_str;
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}
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// std::string 构造
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Json_Value::Json_Value(std::string str) : private_type(TYPE_STR), p_mem(malloc(sizeof(str)))
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{
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