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export * from "./options";
class PartialJSON extends Error {}
class MalformedJSON extends Error {}
const literals = [
["null", Allow.NULL, null, 1],
["true", Allow.BOOL, true, 1],
["false", Allow.BOOL, false, 1],
["Infinity", Allow.INFINITY, Infinity, 1],
["-Infinity", Allow._INFINITY, -Infinity, 2],
["NaN", Allow.NAN, NaN, 1],
] as const;
const notLiteral = Symbol("notLiteral");
/**
* 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);
}
class Parser {
private index = 0;
constructor(
private jsonString: string,
private allow: number,
) {}
parseAny(): any {
this.skipBlank();
if (this.index >= this.jsonString.length) this.markPartialJSON("Unexpected end of input");
if (this.jsonString[this.index] === '"') return this.parseStr();
if (this.jsonString[this.index] === "{") return this.parseObj();
if (this.jsonString[this.index] === "[") return this.parseArr();
const literal = this.parseLiteral();
if (literal !== notLiteral) return literal;
return this.parseNum();
}
private parseLiteral() {
if (!"ntfI-N".includes(this.jsonString[this.index])) return notLiteral;
const rest = this.jsonString.substring(this.index);
for (const [text, flag, value, minLength] of literals) {
if (rest.substring(0, text.length) === text || (flag & this.allow && rest.length < text.length && rest.length >= minLength && text.startsWith(rest))) {
this.index += text.length;
return value;
}
}
return notLiteral;
}
private parseStr(): string {
const start = this.index;
this.index++; // skip initial quote
const escape = this.scanString();
if (this.jsonString.charAt(this.index) == '"') {
try {
return JSON.parse(this.jsonString.substring(start, ++this.index - Number(escape)));
} catch (e) {
this.throwMalformedError(String(e));
}
} else if (Allow.STR & this.allow) {
try {
return JSON.parse(this.jsonString.substring(start, this.index - Number(escape)) + '"');
} catch (e) {
// SyntaxError: Invalid escape sequence
return JSON.parse(this.jsonString.substring(start, this.jsonString.lastIndexOf("\\")) + '"');
}
}
this.markPartialJSON("Unterminated string literal");
}
private scanString() {
let escape = false;
while (this.index < this.jsonString.length && (this.jsonString[this.index] !== '"' || (escape && this.jsonString[this.index - 1] === "\\"))) {
escape = this.jsonString[this.index] === "\\" ? !escape : false;
this.index++;
}
return escape;
}
private parseObj() {
this.index++; // skip initial brace
this.skipBlank();
const obj: Record<string, any> = {};
try {
while (this.jsonString[this.index] !== "}") {
if (this.parseObjEntry(obj)) return obj;
this.skipBlank();
Iif (this.jsonString[this.index] === ",") this.index++; // skip comma
}
} catch (e) {
Iif (Allow.OBJ & this.allow) return obj;
else this.markPartialJSON("Expected '}' at end of object");
}
this.index++; // skip final brace
return obj;
}
private parseObjEntry(obj: Record<string, any>) {
this.skipBlank();
if (this.index >= this.jsonString.length && Allow.OBJ & this.allow) return true;
const key = this.parseStr();
this.skipBlank();
this.index++; // skip colon
try {
obj[key] = this.parseAny();
} catch (e) {
if (Allow.OBJ & this.allow) return true;
else throw e;
}
return false;
}
private parseArr() {
this.index++; // skip initial bracket
const arr = [];
try {
while (this.jsonString[this.index] !== "]") {
arr.push(this.parseAny());
this.skipBlank();
if (this.jsonString[this.index] === ",") {
this.index++; // skip comma
}
}
} catch (e) {
if (Allow.ARR & this.allow) {
return arr;
}
this.markPartialJSON("Expected ']' at end of array");
}
this.index++; // skip final bracket
return arr;
}
private parseNum() {
return this.index === 0 ? this.parseRootNum() : this.parseNestedNum();
}
private parseRootNum() {
Iif (this.jsonString === "-") this.throwMalformedError("Not sure what '-' is");
try {
return JSON.parse(this.jsonString);
} catch (e) {
Eif (Allow.NUM & this.allow) {
try {
return this.parseNumBeforeExponent(0);
} catch (e) {}
}
this.throwMalformedError(String(e));
}
}
private parseNestedNum() {
const start = this.index;
if (this.jsonString[this.index] === "-") this.index++;
while (this.jsonString[this.index] && ",]}".indexOf(this.jsonString[this.index]) === -1) this.index++;
if (this.index == this.jsonString.length && !(Allow.NUM & this.allow)) this.markPartialJSON("Unterminated number literal");
try {
return JSON.parse(this.jsonString.substring(start, this.index));
} catch (e) {
if (this.jsonString.substring(start, this.index) === "-") this.markPartialJSON("Not sure what '-' is");
return this.parseNumBeforeExponent(start);
}
}
private parseNumBeforeExponent(start: number) {
try {
return JSON.parse(this.jsonString.substring(start, this.jsonString.lastIndexOf("e")));
} catch (e) {
this.throwMalformedError(String(e));
}
}
private skipBlank() {
while (this.index < this.jsonString.length && " \n\r\t".includes(this.jsonString[this.index])) {
this.index++;
}
}
private markPartialJSON(msg: string): never {
throw new PartialJSON(`${msg} at position ${this.index}`);
}
private throwMalformedError(msg: string): never {
throw new MalformedJSON(`${msg} at position ${this.index}`);
}
}
const _parseJSON = (jsonString: string, allow: number) => new Parser(jsonString, allow).parseAny();
const parse = parseJSON;
export { parse, parseJSON, PartialJSON, MalformedJSON, Allow };
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