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'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
}
}