@langchain/core/dist/utils/json.cjs.map

Core LangChain.js abstractions and schemas

{"version":3,"file":"json.cjs","names":["s: string","arr: unknown[]","obj: Record<string, unknown>"],"sources":["../../src/utils/json.ts"],"sourcesContent":["export function parseJsonMarkdown(s: string, parser = parsePartialJson) {\n  // eslint-disable-next-line no-param-reassign\n  s = s.trim();\n\n  const firstFenceIndex = s.indexOf(\"```\");\n  if (firstFenceIndex === -1) {\n    return parser(s);\n  }\n\n  let contentAfterFence = s.substring(firstFenceIndex + 3);\n\n  if (contentAfterFence.startsWith(\"json\\n\")) {\n    contentAfterFence = contentAfterFence.substring(5);\n  } else if (contentAfterFence.startsWith(\"json\")) {\n    contentAfterFence = contentAfterFence.substring(4);\n  } else if (contentAfterFence.startsWith(\"\\n\")) {\n    contentAfterFence = contentAfterFence.substring(1);\n  }\n\n  const closingFenceIndex = contentAfterFence.indexOf(\"```\");\n  let finalContent = contentAfterFence;\n  if (closingFenceIndex !== -1) {\n    finalContent = contentAfterFence.substring(0, closingFenceIndex);\n  }\n\n  return parser(finalContent.trim());\n}\n\n/**\n * Recursive descent partial JSON parser.\n * @param s - The string to parse.\n * @returns The parsed value.\n * @throws Error if the input is a malformed JSON string.\n */\nexport function strictParsePartialJson(s: string): unknown {\n  try {\n    return JSON.parse(s);\n  } catch {\n    // Continue to partial parsing\n  }\n\n  const buffer = s.trim();\n  if (buffer.length === 0) throw new Error(\"Unexpected end of JSON input\");\n\n  let pos = 0;\n\n  function skipWhitespace(): void {\n    while (pos < buffer.length && /\\s/.test(buffer[pos])) {\n      pos += 1;\n    }\n  }\n\n  function parseString(): string {\n    if (buffer[pos] !== '\"') {\n      throw new Error(`Expected '\"' at position ${pos}, got '${buffer[pos]}'`);\n    }\n\n    pos += 1;\n    let result = \"\";\n    let escaped = false;\n\n    while (pos < buffer.length) {\n      const char = buffer[pos];\n\n      if (escaped) {\n        if (char === \"n\") {\n          result += \"\\n\";\n        } else if (char === \"t\") {\n          result += \"\\t\";\n        } else if (char === \"r\") {\n          result += \"\\r\";\n        } else if (char === \"\\\\\") {\n          result += \"\\\\\";\n        } else if (char === '\"') {\n          result += '\"';\n        } else if (char === \"b\") {\n          result += \"\\b\";\n        } else if (char === \"f\") {\n          result += \"\\f\";\n        } else if (char === \"/\") {\n          result += \"/\";\n        } else if (char === \"u\") {\n          const hex = buffer.substring(pos + 1, pos + 5);\n          if (/^[0-9A-Fa-f]{0,4}$/.test(hex)) {\n            if (hex.length === 4) {\n              result += String.fromCharCode(Number.parseInt(hex, 16));\n            } else {\n              result += `u${hex}`;\n            }\n\n            pos += hex.length;\n          } else {\n            throw new Error(\n              `Invalid unicode escape sequence '\\\\u${hex}' at position ${pos}`\n            );\n          }\n        } else {\n          throw new Error(\n            `Invalid escape sequence '\\\\${char}' at position ${pos}`\n          );\n        }\n        escaped = false;\n      } else if (char === \"\\\\\") {\n        escaped = true;\n      } else if (char === '\"') {\n        pos += 1;\n        return result;\n      } else {\n        result += char;\n      }\n\n      pos += 1;\n    }\n\n    if (escaped) result += \"\\\\\";\n    return result;\n  }\n\n  function parseNumber(): number {\n    const start = pos;\n    let numStr = \"\";\n\n    if (buffer[pos] === \"-\") {\n      numStr += \"-\";\n      pos += 1;\n    }\n\n    if (pos < buffer.length && buffer[pos] === \"0\") {\n      numStr += \"0\";\n      pos += 1;\n\n      if (buffer[pos] >= \"0\" && buffer[pos] <= \"9\") {\n        throw new Error(`Invalid number at position ${start}`);\n      }\n    }\n\n    if (pos < buffer.length && buffer[pos] >= \"1\" && 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Error(`Unexpected character '${char}' at position ${pos}`);\n  }\n\n  function parseArray(): unknown[] {\n    if (buffer[pos] !== \"[\") {\n      throw new Error(`Expected '[' at position ${pos}, got '${buffer[pos]}'`);\n    }\n\n    const arr: unknown[] = [];\n\n    pos += 1;\n    skipWhitespace();\n\n    if (pos >= buffer.length) return arr;\n    if (buffer[pos] === \"]\") {\n      pos += 1;\n      return arr;\n    }\n\n    while (pos < buffer.length) {\n      skipWhitespace();\n      if (pos >= buffer.length) return arr;\n\n      arr.push(parseValue());\n\n      skipWhitespace();\n      if (pos >= buffer.length) return arr;\n\n      if (buffer[pos] === \"]\") {\n        pos += 1;\n        return arr;\n      } else if (buffer[pos] === \",\") {\n        pos += 1;\n        continue;\n      }\n\n      throw new Error(\n        `Expected ',' or ']' at position ${pos}, got '${buffer[pos]}'`\n      );\n    }\n\n    return arr;\n  }\n\n  function parseObject(): Record<string, unknown> {\n    if (buffer[pos] !== \"{\") {\n      throw new Error(`Expected '{' at position ${pos}, got '${buffer[pos]}'`);\n    }\n\n    const obj: Record<string, unknown> = {};\n    pos += 1;\n    skipWhitespace();\n\n    if (pos >= buffer.length) return obj;\n    if (buffer[pos] === \"}\") {\n      pos += 1;\n      return obj;\n    }\n\n    while (pos < buffer.length) {\n      skipWhitespace();\n      if (pos >= buffer.length) return obj;\n\n      const key = parseString();\n\n      skipWhitespace();\n      if (pos >= buffer.length) return obj;\n\n      if (buffer[pos] !== \":\") {\n        throw new Error(\n          `Expected ':' at position ${pos}, got '${buffer[pos]}'`\n        );\n      }\n      pos += 1;\n\n      skipWhitespace();\n      if (pos >= buffer.length) return obj;\n\n      obj[key] = parseValue();\n\n      skipWhitespace();\n      if (pos >= buffer.length) return obj;\n\n      if (buffer[pos] === \"}\") {\n        pos += 1;\n        return obj;\n      } else if (buffer[pos] === \",\") {\n        pos += 1;\n        continue;\n      }\n\n      throw new Error(\n        `Expected ',' or '}' at position ${pos}, got '${buffer[pos]}'`\n      );\n    }\n\n    return obj;\n  }\n\n  const value = parseValue();\n  skipWhitespace();\n\n  if (pos < buffer.length) {\n    throw new Error(`Unexpected character '${buffer[pos]}' at position ${pos}`);\n  }\n\n  return value;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nexport function parsePartialJson(s: string): any | null {\n  // Attempt to parse the modified string as JSON.\n  try {\n    if (typeof s === \"undefined\") return null;\n    return strictParsePartialJson(s);\n  } catch {\n    // If we still can't parse the string as JSON, return null to indicate failure.\n    return null;\n  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