83 lines
2.5 KiB
JavaScript
83 lines
2.5 KiB
JavaScript
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var createCustomError = require('../utils/createCustomError');
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var MAX_LINE_LENGTH = 100;
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var OFFSET_CORRECTION = 60;
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var TAB_REPLACEMENT = ' ';
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function sourceFragment(error, extraLines) {
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function processLines(start, end) {
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return lines.slice(start, end).map(function(line, idx) {
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var num = String(start + idx + 1);
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while (num.length < maxNumLength) {
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num = ' ' + num;
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}
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return num + ' |' + line;
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}).join('\n');
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}
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var lines = error.source.split(/\r\n?|\n|\f/);
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var line = error.line;
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var column = error.column;
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var startLine = Math.max(1, line - extraLines) - 1;
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var endLine = Math.min(line + extraLines, lines.length + 1);
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var maxNumLength = Math.max(4, String(endLine).length) + 1;
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var 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 (var 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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var SyntaxError = function(message, source, offset, line, column) {
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var error = createCustomError('SyntaxError', message);
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error.source = source;
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error.offset = offset;
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error.line = line;
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error.column = column;
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error.sourceFragment = function(extraLines) {
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return sourceFragment(error, isNaN(extraLines) ? 0 : extraLines);
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};
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Object.defineProperty(error, 'formattedMessage', {
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get: function() {
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return (
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'Parse error: ' + error.message + '\n' +
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sourceFragment(error, 2)
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);
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}
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});
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// for backward capability
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error.parseError = {
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offset: offset,
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line: line,
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column: column
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};
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return error;
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};
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module.exports = SyntaxError;
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