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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 str, got ${typeof jsonString}`);
}
Iif (!jsonString.trim()) {
throw new Error(`${jsonString} is empty`);
}
return _parseJSON(jsonString.trim(), allowPartial);
}
const _parseJSON = (jsonString: string, allow: number) => {
const length = jsonString.length;
let index = 0;
const markPartialJSON = (msg: string) => {
throw new PartialJSON(`${msg} at position ${index}`);
};
const throwMalformedError = (msg: string) => {
throw new MalformedJSON(`${msg} at position ${index}`);
};
const parseAny: () => any = () => {
skipBlank();
if (index >= length) markPartialJSON("Unexpected end of input");
if (jsonString[index] === '"') return parseStr();
if (jsonString[index] === "{") return parseObj();
if (jsonString[index] === "[") return parseArr();
if (jsonString.substring(index, index + 4) === "null" || (Allow.NULL & allow && length - index < 4 && "null".startsWith(jsonString.substring(index)))) {
index += 4;
return null;
}
if (jsonString.substring(index, index + 4) === "true" || (Allow.BOOL & allow && length - index < 4 && "true".startsWith(jsonString.substring(index)))) {
index += 4;
return true;
}
if (jsonString.substring(index, index + 5) === "false" || (Allow.BOOL & allow && length - index < 5 && "false".startsWith(jsonString.substring(index)))) {
index += 5;
return false;
}
if (jsonString.substring(index, index + 8) === "Infinity" || (Allow.INFINITY & allow && length - index < 8 && "Infinity".startsWith(jsonString.substring(index)))) {
index += 8;
return Infinity;
}
if (jsonString.substring(index, index + 9) === "-Infinity" || (Allow._INFINITY & allow && 1 < length - index && length - index < 9 && "-Infinity".startsWith(jsonString.substring(index)))) {
index += 9;
return -Infinity;
}
if (jsonString.substring(index, index + 3) === "NaN" || (Allow.NAN & allow && length - index < 3 && "NaN".startsWith(jsonString.substring(index)))) {
index += 3;
return NaN;
}
// Check if we have a valid number character before calling parseNum
const char = jsonString[index];
if (char === "-" || (char >= "0" && char <= "9")) {
return parseNum();
}
// If we get here, it's an invalid token
throwMalformedError(`Unexpected token '${char}'`);
};
const parseStr: () => string = () => {
const start = index;
let escape = false;
index++; // skip initial quote
while (index < length && (jsonString[index] !== '"' || (escape && jsonString[index - 1] === "\\"))) {
escape = jsonString[index] === "\\" ? !escape : false;
index++;
}
if (jsonString.charAt(index) == '"') {
try {
return JSON.parse(jsonString.substring(start, ++index - Number(escape)));
} catch (e) {
throwMalformedError(String(e));
}
} else if (Allow.STR & allow) {
try {
return JSON.parse(jsonString.substring(start, index - Number(escape)) + '"');
} catch (e) {
// SyntaxError: Invalid escape sequence
return JSON.parse(jsonString.substring(start, jsonString.lastIndexOf("\\")) + '"');
}
}
markPartialJSON("Unterminated string literal");
};
const parseObj = () => {
index++; // skip initial brace
skipBlank();
const obj: Record<string, any> = {};
try {
while (jsonString[index] !== "}") {
skipBlank();
if (index >= length && Allow.OBJ & allow) return obj;
const key = parseStr();
skipBlank();
index++; // skip colon
try {
const value = parseAny();
obj[key] = value;
} catch (e) {
// If it's a malformed JSON error, let it bubble up
if (e instanceof MalformedJSON) {
throw e;
}
if (Allow.OBJ & allow) return obj;
else throw e;
}
skipBlank();
if (jsonString[index] === ",") index++; // skip comma
}
} catch (e) {
// If it's a malformed JSON error, let it bubble up
if (e instanceof MalformedJSON) {
throw e;
}
Iif (Allow.OBJ & allow) return obj;
else markPartialJSON("Expected '}' at end of object");
}
index++; // skip final brace
return obj;
};
const parseArr = () => {
index++; // skip initial bracket
skipBlank(); // skip whitespace at start of array
const arr = [];
try {
while (jsonString[index] !== "]") {
arr.push(parseAny());
skipBlank();
if (jsonString[index] === ",") {
index++; // skip comma
skipBlank(); // skip whitespace after comma
}
}
} catch (e) {
// If it's a malformed JSON error, let it bubble up
if (e instanceof MalformedJSON) {
throw e;
}
if (Allow.ARR & allow) {
return arr;
}
markPartialJSON("Expected ']' at end of array");
}
index++; // skip final bracket
return arr;
};
const parseNum = () => {
if (index === 0) {
Iif (jsonString === "-") throwMalformedError("Not sure what '-' is");
try {
return JSON.parse(jsonString);
} catch (e) {
Eif (Allow.NUM & allow)
try {
return JSON.parse(jsonString.substring(0, jsonString.lastIndexOf("e")));
} catch (e) {}
throwMalformedError(String(e));
}
}
const start = index;
Iif (jsonString[index] === "-") index++;
while (jsonString[index] && ",]}".indexOf(jsonString[index]) === -1) index++;
Iif (index == length && !(Allow.NUM & allow)) markPartialJSON("Unterminated number literal");
try {
return JSON.parse(jsonString.substring(start, index));
} catch (e) {
if (jsonString.substring(start, index) === "-") markPartialJSON("Not sure what '-' is");
// If the number is partial and we allow partial numbers, try to parse up to last 'e'
if (Allow.NUM & allow) {
const numberStr = jsonString.substring(start, index);
const lastE = numberStr.lastIndexOf("e");
if (lastE > 0) {
try {
return JSON.parse(numberStr.substring(0, lastE));
} catch (e2) {
// Still invalid, fall through to error
}
}
}
throwMalformedError(String(e));
}
};
const skipBlank = () => {
while (index < length && " \n\r\t".includes(jsonString[index])) {
index++;
}
};
return parseAny();
};
const parse = parseJSON;
export { parse, parseJSON, PartialJSON, MalformedJSON, Allow };
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