@langchain/core
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Core LangChain.js abstractions and schemas
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{"version":3,"file":"json.cjs","names":[],"sources":["../../src/utils/json.ts"],"sourcesContent":["export function parseJsonMarkdown(s: string, parser = parsePartialJson) {\n // oxlint-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 ${pos}`\n );\n }\n escaped = false;\n } else if (char === \"\\\\\") {\n escaped = true;\n } else if (char === '\"') {\n pos += 1;\n return result;\n } else {\n result += char;\n }\n\n pos += 1;\n }\n\n if (escaped) result += \"\\\\\";\n return result;\n }\n\n function parseNumber(): number 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buffer.length && buffer[pos] >= \"0\" && buffer[pos] <= \"9\") {\n numStr += buffer[pos];\n pos += 1;\n }\n }\n\n if (numStr === \"-\") return -0;\n\n const num = Number.parseFloat(numStr);\n\n if (Number.isNaN(num)) {\n pos = start;\n throw new Error(`Invalid number '${numStr}' at position ${start}`);\n }\n\n return num;\n }\n\n function parseValue(): unknown {\n skipWhitespace();\n\n if (pos >= buffer.length) {\n throw new Error(`Unexpected end of input at position ${pos}`);\n }\n\n const char = buffer[pos];\n\n if (char === \"{\") return parseObject();\n if (char === \"[\") return parseArray();\n if (char === '\"') return parseString();\n\n if (\"null\".startsWith(buffer.substring(pos, pos + 4))) {\n pos += Math.min(4, buffer.length - pos);\n return null;\n }\n\n if (\"true\".startsWith(buffer.substring(pos, pos + 4))) {\n pos += Math.min(4, buffer.length - pos);\n return true;\n }\n\n if (\"false\".startsWith(buffer.substring(pos, pos + 5))) {\n pos += Math.min(5, buffer.length - pos);\n return false;\n }\n\n if (char === \"-\" || (char >= \"0\" && char <= \"9\")) {\n return parseNumber();\n }\n\n throw new Error(`Unexpected character '${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// oxlint-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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