105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
#include "JsonSerializer.h"
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#include <sstream>
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#include <iomanip>
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#include <iostream>
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#include <string>
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std::string JsonSerializer::serialize(const JsonValue& value, int indent){
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std::string result;
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serializeValue(value, result, indent, 0);
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return result;
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}
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//直接用JsonValue里面的内容，indent表示缩进个数
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void JsonSerializer::serializeValue(const JsonValue& value, std::string& out, int indent, int currIndent) {
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// 处理基础类型 (Null, Bool, Double, String)
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if (const_cast<JsonValue&>(value).is_nullptr()) {
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out += "null";
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} else if (const_cast<JsonValue&>(value).is_bool()) {
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out += (value.asBool() ? "true" : "false");
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} else if (const_cast<JsonValue&>(value).is_double()) {
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std::string s = std::to_string(value.asDouble());
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s.erase(s.find_last_not_of('0') + 1, std::string::npos);
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if (s.back() == '.') s.pop_back();
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out += s;
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} else if (const_cast<JsonValue&>(value).is_string()) {
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out += escapeString(value.asString());
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}
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// 处理 List (Array)
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else if (const_cast<JsonValue&>(value).is_list()) {
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out += "[";
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const auto& list = value.asList();
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for (size_t i = 0; i < list.size(); ++i) {
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if (indent > 0) {
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out += "\n";
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addIndent(out, currIndent + indent);
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}
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serializeValue(list[i], out, indent, currIndent + indent);
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if (i < list.size() - 1) out += ",";
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}
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if (indent > 0 && !list.empty()) {
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out += "\n";
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addIndent(out, currIndent);
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}
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out += "]";
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}
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// 处理 Map (Object)
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else if (const_cast<JsonValue&>(value).is_map()) {
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out += "{";
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const auto& mp = value.asMap();
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for (auto it = mp.begin(); it != mp.end(); ++it) {
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if (indent > 0) {
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out += "\n";
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addIndent(out, currIndent + indent);
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}
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// 写入 Key (必须转义并加引号)
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out += escapeString(it->first);
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out += (indent > 0) ? ": " : ":";
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// 递归写入 Value
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serializeValue(it->second, out, indent, currIndent + indent);
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if (std::next(it) != mp.end()) out += ",";
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}
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if (indent > 0 && !mp.empty()) {
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out += "\n";
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addIndent(out, currIndent);
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}
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out += "}";
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}
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// 重点：所有的逗号都由父节点负责添加(List 和 Map)
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}
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void JsonSerializer::addIndent(std::string& out, int indent){
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out.append(indent, ' ');
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}
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//处理转译字符
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std::string JsonSerializer::escapeString(const std::string& s){
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std::string out = "\"";
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for (char c : s) {
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switch (c) {
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case '"': out += "\\\""; break;
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case '\\': out += "\\\\"; break;
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case '\b': out += "\\b"; break;
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case '\f': out += "\\f"; break;
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case '\n': out += "\\n"; break;
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case '\r': out += "\\r"; break;
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case '\t': out += "\\t"; break;
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default:
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if (static_cast<unsigned char>(c) < 0x20) {
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std::ostringstream oss;
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oss << "\\u" << std::hex << std::setw(4) << std::setfill('0') << static_cast<int>(c);
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out += oss.str();
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} else {
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out += c;
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}
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}
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}
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out += "\"";
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return out;
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}
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