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