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38 lines
1.1 KiB
38 lines
1.1 KiB
'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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