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export * from "./options";
class PartialJSON extends Error {}
class MalformedJSON extends Error {}
/**
* Parse incomplete JSON
* @param {string} jsonString Partial JSON to be parsed
* @param {number} allowPartial Specify what types are allowed to be partial, see {@link Allow} for details
* @returns The parsed JSON
* @throws {PartialJSON} If the JSON is incomplete (related to the `allow` parameter)
* @throws {MalformedJSON} If the JSON is malformed
*/
function parseJSON(jsonString: string, allowPartial: number = Allow.ALL): any {
Iif (typeof jsonString !== "string") {
throw new TypeError(`expecting string, got ${typeof jsonString}`);
}
Iif (!jsonString.trim()) {
throw new Error(`Input is empty`);
}
return _parseJSON(jsonString.trim(), allowPartial);
}
const _parseJSON = (jsonString: string, allow: number) => {
const length = jsonString.length;
let index = 0;
let objectDepth = 0; // Track the current depth of objects
let arrayDepth = 0; // Track the current depth of arrays
const markPartialJSON = (msg: string) => {
throw new PartialJSON(`${msg} at position ${index}`);
};
const throwMalformedError = (msg: string) => {
throw new MalformedJSON(`${msg} at position ${index}`);
};
const parseAny: () => any = () => {
skipBlank();
if (index >= length) markPartialJSON("Unexpected end of input");
const currentChar = jsonString[index];
// Handle string
if (currentChar === '"') return parseStr();
// Handle object
if (currentChar === "{") {
objectDepth++;
const result = parseObj();
objectDepth--;
return result;
}
// Handle array
if (currentChar === "[") {
arrayDepth++;
const result = parseArr();
arrayDepth--;
return result;
}
// Handle literals and numbers
if (
jsonString.substring(index, index + 4) === "null" ||
(Allow.NULL & allow &&
length - index < 4 &&
"null".startsWith(jsonString.substring(index)))
) {
index += 4;
return null;
}
if (
jsonString.substring(index, index + 4) === "true" ||
(Allow.BOOL & allow &&
length - index < 4 &&
"true".startsWith(jsonString.substring(index)))
) {
index += 4;
return true;
}
if (
jsonString.substring(index, index + 5) === "false" ||
(Allow.BOOL & allow &&
length - index < 5 &&
"false".startsWith(jsonString.substring(index)))
) {
index += 5;
return false;
}
if (
jsonString.substring(index, index + 8) === "Infinity" ||
(Allow.INFINITY & allow &&
length - index < 8 &&
"Infinity".startsWith(jsonString.substring(index)))
) {
index += 8;
return Infinity;
}
if (
jsonString.substring(index, index + 9) === "-Infinity" ||
(Allow._INFINITY & allow &&
1 < length - index &&
length - index < 9 &&
"-Infinity".startsWith(jsonString.substring(index)))
) {
index += 9;
return -Infinity;
}
if (
jsonString.substring(index, index + 3) === "NaN" ||
(Allow.NAN & allow &&
length - index < 3 &&
"NaN".startsWith(jsonString.substring(index)))
) {
index += 3;
return NaN;
}
return parseNum();
};
const parseStr: () => string = () => {
const start = index;
let escape = false;
index++; // skip initial quote
while (index < length) {
const char = jsonString[index];
if (char === '"' && !escape) {
index++; // include the closing quote
try {
return JSON.parse(jsonString.substring(start, index));
} catch (e) {
throwMalformedError(`Invalid string: ${e}`);
}
}
if (char === "\\" && !escape) {
escape = true;
} else {
escape = false;
}
index++;
}
// If we reach here, the string was unterminated
if (Allow.STR & allow) {
try {
// Attempt to close the string by adding the closing quote
return JSON.parse(jsonString.substring(start, index) + '"');
} catch (e) {
// Attempt to recover by removing trailing backslashes
const lastBackslash = jsonString.lastIndexOf("\\");
Eif (lastBackslash > start) {
try {
return JSON.parse(jsonString.substring(start, lastBackslash) + '"');
} catch (_) {}
}
throwMalformedError("Unterminated string literal");
}
}
markPartialJSON("Unterminated string literal");
};
const parseObj = () => {
const isOutermost = objectDepth === 1;
index++; // skip initial brace
skipBlank();
const obj: Record<string, any> = {};
try {
while (jsonString[index] !== "}") {
skipBlank();
if (index >= length) {
if (
(isOutermost && allow & Allow.OUTERMOST_OBJ) ||
allow & Allow.OBJ
) {
return obj;
}
markPartialJSON("Unexpected end of object");
}
// Parse key
const key = parseStr();
skipBlank();
if (jsonString[index] !== ":") {
throwMalformedError(`Expected ':' after key "${key}"`);
}
index++; // skip colon
skipBlank();
// Parse value
try {
const value = parseAny();
obj[key] = value;
} catch (e) {
if (
(isOutermost && allow & Allow.OUTERMOST_OBJ) ||
allow & Allow.OBJ
) {
return obj;
}
throw e;
}
skipBlank();
// Handle comma or end of object
if (jsonString[index] === ",") {
index++; // skip comma
skipBlank();
// If next character is '}', it's the end of the object
Iif (jsonString[index] === "}") {
break;
}
}
}
} catch (e) {
Iif ((isOutermost && allow & Allow.OUTERMOST_OBJ) || allow & Allow.OBJ) {
return obj;
} else {
markPartialJSON("Expected '}' at end of object");
}
}
Eif (jsonString[index] === "}") {
index++; // skip final brace
return obj;
}
// If we reach here, the object was not properly closed
if ((isOutermost && allow & Allow.OUTERMOST_OBJ) || allow & Allow.OBJ) {
return obj;
}
markPartialJSON("Expected '}' at end of object");
};
const parseArr = () => {
const isOutermost = arrayDepth === 1;
index++; // skip initial bracket
const arr: any[] = [];
try {
while (jsonString[index] !== "]") {
skipBlank();
if (index >= length) {
if (
(isOutermost && allow & Allow.OUTERMOST_ARR) ||
allow & Allow.ARR
) {
return arr;
}
markPartialJSON("Unexpected end of array");
}
// Parse value
const value = parseAny();
arr.push(value);
skipBlank();
// Handle comma or end of array
if (jsonString[index] === ",") {
index++; // skip comma
skipBlank();
// If next character is ']', it's the end of the array
Iif (jsonString[index] === "]") {
break;
}
}
}
} catch (e) {
if ((isOutermost && allow & Allow.OUTERMOST_ARR) || allow & Allow.ARR) {
return arr;
}
throw e;
}
Eif (jsonString[index] === "]") {
index++; // skip final bracket
return arr;
}
// If we reach here, the array was not properly closed
if ((isOutermost && allow & Allow.OUTERMOST_ARR) || allow & Allow.ARR) {
return arr;
}
markPartialJSON("Expected ']' at end of array");
};
const parseNum = () => {
const start = index;
// Handle negative sign
if (jsonString[index] === "-") index++;
// Integral part
while (index < length && /[0-9]/.test(jsonString[index])) {
index++;
}
// Fractional part
if (jsonString[index] === ".") {
index++;
while (index < length && /[0-9]/.test(jsonString[index])) {
index++;
}
}
// Exponent part
if (jsonString[index] === "e" || jsonString[index] === "E") {
index++;
if (jsonString[index] === "+" || jsonString[index] === "-") {
index++;
}
while (index < length && /[0-9]/.test(jsonString[index])) {
index++;
}
}
const numStr = jsonString.substring(start, index);
try {
return JSON.parse(numStr);
} catch (e) {
Eif (Allow.NUM & allow) {
// Attempt to parse the valid part of the number
const validMatch = numStr.match(/^-?\d+(\.\d+)?([eE][+-]?\d+)?/);
if (validMatch && validMatch[0]) {
try {
return JSON.parse(validMatch[0]);
} catch (_) {}
}
}
throwMalformedError(`Invalid number '${numStr}'`);
}
};
const skipBlank = () => {
while (index < length && " \n\r\t".includes(jsonString[index])) {
index++;
}
};
const result = parseAny();
skipBlank();
Iif (index < length) {
throwMalformedError(`Unexpected token '${jsonString[index]}'`);
}
return result;
};
const parse = parseJSON;
export { parse, parseJSON, PartialJSON, MalformedJSON, Allow };
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