66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
import { createCustomError } from '../utils/create-custom-error.js';
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const MAX_LINE_LENGTH = 100;
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const OFFSET_CORRECTION = 60;
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const TAB_REPLACEMENT = ' ';
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function sourceFragment({ source, line, column }, extraLines) {
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function processLines(start, end) {
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return lines
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.slice(start, end)
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.map((line, idx) =>
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String(start + idx + 1).padStart(maxNumLength) + ' |' + line
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).join('\n');
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}
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const lines = source.split(/\r\n?|\n|\f/);
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const startLine = Math.max(1, line - extraLines) - 1;
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const endLine = Math.min(line + extraLines, lines.length + 1);
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const maxNumLength = Math.max(4, String(endLine).length) + 1;
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let cutLeft = 0;
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// column correction according to replaced tab before column
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column += (TAB_REPLACEMENT.length - 1) * (lines[line - 1].substr(0, column - 1).match(/\t/g) || []).length;
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if (column > MAX_LINE_LENGTH) {
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cutLeft = column - OFFSET_CORRECTION + 3;
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column = OFFSET_CORRECTION - 2;
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}
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for (let i = startLine; i <= endLine; i++) {
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if (i >= 0 && i < lines.length) {
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lines[i] = lines[i].replace(/\t/g, TAB_REPLACEMENT);
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lines[i] =
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(cutLeft > 0 && lines[i].length > cutLeft ? '\u2026' : '') +
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lines[i].substr(cutLeft, MAX_LINE_LENGTH - 2) +
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(lines[i].length > cutLeft + MAX_LINE_LENGTH - 1 ? '\u2026' : '');
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}
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}
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return [
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processLines(startLine, line),
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new Array(column + maxNumLength + 2).join('-') + '^',
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processLines(line, endLine)
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].filter(Boolean).join('\n');
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}
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export function SyntaxError(message, source, offset, line, column) {
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const error = Object.assign(createCustomError('SyntaxError', message), {
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source,
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offset,
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line,
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column,
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sourceFragment(extraLines) {
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return sourceFragment({ source, line, column }, isNaN(extraLines) ? 0 : extraLines);
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},
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get formattedMessage() {
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return (
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`Parse error: ${message}\n` +
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sourceFragment({ source, line, column }, 2)
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);
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}
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});
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return error;
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}
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