98 lines
2.2 KiB
C#
98 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text.Json;
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using static System.Runtime.InteropServices.JavaScript.JSType;
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namespace VideoAnalysisCore.Common
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{
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public static class JsonExtractor
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{
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/// <summary>
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/// 提取json字符串
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/// </summary>
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/// <param name="input"></param>
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/// <returns></returns>
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public static List<string> ExtractJsonStrings(this string input)
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{
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var results = new List<string>();
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if (string.IsNullOrWhiteSpace(input)) return results;
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int braceCount = 0;
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int bracketCount = 0;
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int startIndex = -1;
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bool inString = false;
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bool isEscaped = false;
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for (int i = 0; i<input.Length; i++)
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{
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char c = input[i];
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// 1. 处理转义字符 (例如 \")
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if (isEscaped)
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{
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isEscaped = false;
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continue;
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}
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if (c == '\\')
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{
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isEscaped = true;
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continue;
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}
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// 2. 处理字符串边界
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if (c == '"')
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{
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inString = !inString;
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continue;
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}
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// 3. 如果在字符串内，忽略括号逻辑
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if (inString) continue;
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// 4. 处理 JSON 对象和数组的开始
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if (c == '{' || c == '[')
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{
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if (braceCount == 0 && bracketCount == 0)
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{
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startIndex = i;
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}
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if (c == '{') braceCount++;
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else bracketCount++;
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}
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// 5. 处理 JSON 对象和数组的结束
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else if (c == '}' || c == ']')
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{
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if (c == '}') braceCount--;
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else bracketCount--;
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if (braceCount == 0 && bracketCount == 0 && startIndex != -1)
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{
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string potentialJson = input.Substring(startIndex, i - startIndex + 1);
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if (IsValidJson(potentialJson))
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{
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results.Add(potentialJson);
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}
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startIndex = -1;
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}
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}
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}
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return results;
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}
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public static bool IsValidJson(string candidate)
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{
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if (string.IsNullOrEmpty(candidate))
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return false;
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try
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{
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JsonDocument.Parse(candidate);
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return true;
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}
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catch
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{
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return false;
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}
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}
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}
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} |