39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
|
'use strict'
|
||
|
|
|
||
|
|
module.exports = parseJson
|
||
|
|
function parseJson (txt, reviver, context) {
|
||
|
|
context = context || 20
|
||
|
|
try {
|
||
|
|
return JSON.parse(txt, reviver)
|
||
|
|
} catch (e) {
|
||
|
|
if (typeof txt !== 'string') {
|
||
|
|
const isEmptyArray = Array.isArray(txt) && txt.length === 0
|
||
|
|
const errorMessage = 'Cannot parse ' +
|
||
|
|
(isEmptyArray ? 'an empty array' : String(txt))
|
||
|
|
throw new TypeError(errorMessage)
|
||
|
|
}
|
||
|
|
const syntaxErr = e.message.match(/^Unexpected token.*position\s+(\d+)/i)
|
||
|
|
const errIdx = syntaxErr
|
||
|
|
? +syntaxErr[1]
|
||
|
|
: e.message.match(/^Unexpected end of JSON.*/i)
|
||
|
|
? txt.length - 1
|
||
|
|
: null
|
||
|
|
if (errIdx != null) {
|
||
|
|
const start = errIdx <= context
|
||
|
|
? 0
|
||
|
|
: errIdx - context
|
||
|
|
const end = errIdx + context >= txt.length
|
||
|
|
? txt.length
|
||
|
|
: errIdx + context
|
||
|
|
e.message += ` while parsing near '${
|
||
|
|
start === 0 ? '' : '...'
|
||
|
|
}${txt.slice(start, end)}${
|
||
|
|
end === txt.length ? '' : '...'
|
||
|
|
}'`
|
||
|
|
} else {
|
||
|
|
e.message += ` while parsing '${txt.slice(0, context * 2)}'`
|
||
|
|
}
|
||
|
|
throw e
|
||
|
|
}
|
||
|
|
}
|