StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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75 lines
2.0 KiB
75 lines
2.0 KiB
'use strict'
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const parseError = (e, txt, context) => {
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if (!txt) {
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return {
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message: e.message + ' while parsing empty string',
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position: 0,
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}
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}
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const badToken = e.message.match(/^Unexpected token.*position\s+(\d+)/i)
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const errIdx = badToken ? +badToken[1]
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: e.message.match(/^Unexpected end of JSON.*/i) ? txt.length - 1
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: null
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if (errIdx !== null && errIdx !== undefined) {
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const start = errIdx <= context ? 0
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: errIdx - context
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const end = errIdx + context >= txt.length ? txt.length
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: errIdx + context
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const slice = (start === 0 ? '' : '...') +
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txt.slice(start, end) +
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(end === txt.length ? '' : '...')
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const near = txt === slice ? '' : 'near '
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return {
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message: e.message + ` while parsing ${near}'${slice}'`,
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position: errIdx,
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}
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} else {
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return {
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message: e.message + ` while parsing '${txt.slice(0, context * 2)}'`,
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position: 0,
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}
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}
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}
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class JSONParseError extends SyntaxError {
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constructor (er, txt, context, caller) {
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context = context || 20
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const metadata = parseError(er, txt, context)
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super(metadata.message)
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Object.assign(this, metadata)
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this.code = 'EJSONPARSE'
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this.systemError = er
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Error.captureStackTrace(this, caller || this.constructor)
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}
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get name () { return this.constructor.name }
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set name (n) {}
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get [Symbol.toStringTag] () { return this.constructor.name }
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}
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const 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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throw Object.assign(new TypeError(
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`Cannot parse ${isEmptyArray ? 'an empty array' : String(txt)}`
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), {
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code: 'EJSONPARSE',
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systemError: e,
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})
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}
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throw new JSONParseError(e, txt, context, parseJson)
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}
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}
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module.exports = parseJson
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parseJson.JSONParseError = JSONParseError
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