import Singleton from '../abstracts/Singleton';
/**
* JSON Parser utility.
*
* This utility parses JSON-like data that does not strictly meet the JSON specifications in order to simplify development.
* It is a safe replacement for JSON.parse(JSON.stringify(eval("({" + value + "})"))) that does not require the use of eval()
*
* @author Ayumi Hamasaki
* @author Ben Thomson <git@alfreido.com>
* @see https://github.com/octobercms/october/pull/4527
*/
export default class JsonParser extends Singleton {
construct() {
// Add to global function for backwards compatibility
window.wnJSON = (json) => this.parse(json);
window.ocJSON = window.wnJSON;
}
parse(str) {
const jsonString = this.parseString(str);
return JSON.parse(jsonString);
}
parseString(value) {
let str = value.trim();
if (!str.length) {
throw new Error('Broken JSON object.');
}
let result = '';
let type = null;
let key = null;
let body = '';
/*
* the mistake ','
*/
while (str && str[0] === ',') {
str = str.substr(1);
}
/*
* string
*/
if (str[0] === '"' || str[0] === '\'') {
if (str[str.length - 1] !== str[0]) {
throw new Error('Invalid string JSON object.');
}
body = '"';
for (let i = 1; i < str.length; i += 1) {
if (str[i] === '\\') {
if (str[i + 1] === '\'') {
body += str[i + 1];
} else {
body += str[i];
body += str[i + 1];
}
i += 1;
} else if (str[i] === str[0]) {
body += '"';
return body;
} else if (str[i] === '"') {
body += '\\"';
} else {
body += str[i];
}
}
throw new Error('Invalid string JSON object.');
}
/*
* boolean
*/
if (str === 'true' || str === 'false') {
return str;
}
/*
* null
*/
if (str === 'null') {
return 'null';
}
/*
* number
*/
const num = Number(str);
if (!Number.isNaN(num)) {
return num.toString();
}
/*
* object
*/
if (str[0] === '{') {
type = 'needKey';
key = null;
result = '{';
for (let i = 1; i < str.length; i += 1) {
if (this.isBlankChar(str[i])) {
/* eslint-disable-next-line */
continue;
}
if (type === 'needKey' && (str[i] === '"' || str[i] === '\'')) {
key = this.parseKey(str, i + 1, str[i]);
result += `"${key}"`;
i += key.length;
i += 1;
type = 'afterKey';
} else if (type === 'needKey' && this.canBeKeyHead(str[i])) {
key = this.parseKey(str, i);
result += '"';
result += key;
result += '"';
i += key.length - 1;
type = 'afterKey';
} else if (type === 'afterKey' && str[i] === ':') {
result += ':';
type = ':';
} else if (type === ':') {
body = this.getBody(str, i);
i = i + body.originLength - 1;
result += this.parseString(body.body);
type = 'afterBody';
} else if (type === 'afterBody' || type === 'needKey') {
let last = i;
while (str[last] === ',' || this.isBlankChar(str[last])) {
last += 1;
}
if (str[last] === '}' && last === str.length - 1) {
while (result[result.length - 1] === ',') {
result = result.substr(0, result.length - 1);
}
result += '}';
return result;
}
if (last !== i && result !== '{') {
result += ',';
type = 'needKey';
i = last - 1;
}
}
}
throw new Error(`Broken JSON object near ${result}`);
}
/*
* array
*/
if (str[0] === '[') {
result = '[';
type = 'needBody';
for (let i = 1; i < str.length; i += 1) {
if (str[i] === ' ' || str[i] === '\n' || str[i] === '\t') {
/* eslint-disable-next-line */
continue;
} else if (type === 'needBody') {
if (str[i] === ',') {
result += 'null,';
/* eslint-disable-next-line */
continue;
}
if (str[i] === ']' && i === str.length - 1) {
if (result[result.length - 1] === ',') {
result = result.substr(0, result.length - 1);
}
result += ']';
return result;
}
body = this.getBody(str, i);
i = i + body.originLength - 1;
result += this.parseString(body.body);
type = 'afterBody';
} else if (type === 'afterBody') {
if (str[i] === ',') {
result += ',';
type = 'needBody';
// deal with mistake ","
while (str[i + 1] === ',' || this.isBlankChar(str[i + 1])) {
if (str[i + 1] === ',') {
result += 'null,';
}
i += 1;
}
} else if (str[i] === ']' && i === str.length - 1) {
result += ']';
return result;
}
}
}
throw new Error(`Broken JSON array near ${result}`);
}
return '';
}
getBody(str, pos) {
let body = '';
// parse string body
if (str[pos] === '"' || str[pos] === '\'') {
body = str[pos];
for (let i = pos + 1; i < str.length; i += 1) {
if (str[i] === '\\') {
body += str[i];
if (i + 1 < str.length) {
body += str[i + 1];
}
i += 1;
} else if (str[i] === str[pos]) {
body += str[pos];
return {
originLength: body.length,
body,
};
} else {
body += str[i];
}
}
throw new Error(`Broken JSON string body near ${body}`);
}
// parse true / false
if (str[pos] === 't') {
if (str.indexOf('true', pos) === pos) {
return {
originLength: 'true'.length,
body: 'true',
};
}
throw new Error(`Broken JSON boolean body near ${str.substr(0, pos + 10)}`);
}
if (str[pos] === 'f') {
if (str.indexOf('f', pos) === pos) {
return {
originLength: 'false'.length,
body: 'false',
};
}
throw new Error(`Broken JSON boolean body near ${str.substr(0, pos + 10)}`);
}
// parse null
if (str[pos] === 'n') {
if (str.indexOf('null', pos) === pos) {
return {
originLength: 'null'.length,
body: 'null',
};
}
throw new Error(`Broken JSON boolean body near ${str.substr(0, pos + 10)}`);
}
// parse number
if (str[pos] === '-' || str[pos] === '+' || str[pos] === '.' || (str[pos] >= '0' && str[pos] <= '9')) {
body = '';
for (let i = pos; i < str.length; i += 1) {
if (str[i] === '-' || str[i] === '+' || str[i] === '.' || (str[i] >= '0' && str[i] <= '9')) {
body += str[i];
} else {
return {
originLength: body.length,
body,
};
}
}
throw new Error(`Broken JSON number body near ${body}`);
}
// parse object
if (str[pos] === '{' || str[pos] === '[') {
const stack = [
str[pos],
];
body = str[pos];
for (let i = pos + 1; i < str.length; i += 1) {
body += str[i];
if (str[i] === '\\') {
if (i + 1 < str.length) {
body += str[i + 1];
}
i += 1;
} else if (str[i] === '"') {
if (stack[stack.length - 1] === '"') {
stack.pop();
} else if (stack[stack.length - 1] !== '\'') {
stack.push(str[i]);
}
} else if (str[i] === '\'') {
if (stack[stack.length - 1] === '\'') {
stack.pop();
} else if (stack[stack.length - 1] !== '"') {
stack.push(str[i]);
}
} else if (stack[stack.length - 1] !== '"' && stack[stack.length - 1] !== '\'') {
if (str[i] === '{') {
stack.push('{');
} else if (str[i] === '}') {
if (stack[stack.length - 1] === '{') {
stack.pop();
} else {
throw new Error(`Broken JSON ${(str[pos] === '{' ? 'object' : 'array')} body near ${body}`);
}
} else if (str[i] === '[') {
stack.push('[');
} else if (str[i] === ']') {
if (stack[stack.length - 1] === '[') {
stack.pop();
} else {
throw new Error(`Broken JSON ${(str[pos] === '{' ? 'object' : 'array')} body near ${body}`);
}
}
}
if (!stack.length) {
return {
originLength: i - pos,
body,
};
}
}
throw new Error(`Broken JSON ${(str[pos] === '{' ? 'object' : 'array')} body near ${body}`);
}
throw new Error(`Broken JSON body near ${str.substr((pos - 5 >= 0) ? pos - 5 : 0, 50)}`);
}
parseKey(str, pos, quote) {
let key = '';
for (let i = pos; i < str.length; i += 1) {
if (quote && quote === str[i]) {
return key;
}
if (!quote && (str[i] === ' ' || str[i] === ':')) {
return key;
}
key += str[i];
if (str[i] === '\\' && i + 1 < str.length) {
key += str[i + 1];
i += 1;
}
}
throw new Error(`Broken JSON syntax near ${key}`);
}
canBeKeyHead(ch) {
if (ch[0] === '\\') {
return false;
}
if ((ch[0] >= 'a' && ch[0] <= 'z') || (ch[0] >= 'A' && ch[0] <= 'Z') || ch[0] === '_') {
return true;
}
if (ch[0] >= '0' && ch[0] <= '9') {
return true;
}
if (ch[0] === '$') {
return true;
}
if (ch.charCodeAt(0) > 255) {
return true;
}
return false;
}
isBlankChar(ch) {
return ch === ' ' || ch === '\n' || ch === '\t';
}
}
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