marys
44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
module.exports = (txt, reviver, 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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handleJsonNotString(txt);
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const syntaxErr = e.message.match(/^Unexpected token.*position\s+(\d+)/i);
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const errIdxBrokenJson = e.message.match(/^Unexpected end of JSON.*/i) ? txt.length - 1 : null;
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const errIdx = syntaxErr ? +syntaxErr[1] : errIdxBrokenJson;
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handleErrIdxNotNull(e, txt, errIdx, context);
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e.offset = errIdx;
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const lines = txt.substr(0, errIdx).split('\n');
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e.startLine = lines.length;
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e.startColumn = lines[lines.length - 1].length;
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throw e;
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}
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};
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function handleJsonNotString(txt) {
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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 ${
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isEmptyArray ? 'an empty array' : String(txt)}`;
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throw new TypeError(errorMessage);
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}
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}
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function handleErrIdxNotNull(e, txt, errIdx, context) {
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if (errIdx !== null) {
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const start = errIdx <= context
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? 0
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: errIdx - context;
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const end = errIdx + context >= txt.length
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? txt.length
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: errIdx + context;
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e.message += ` while parsing near '${
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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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}
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