58 lines
2 KiB
JavaScript
58 lines
2 KiB
JavaScript
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class YAMLError extends Error {
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constructor(name, pos, code, message) {
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super();
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this.name = name;
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this.code = code;
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this.message = message;
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this.pos = pos;
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}
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}
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class YAMLParseError extends YAMLError {
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constructor(pos, code, message) {
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super('YAMLParseError', pos, code, message);
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}
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}
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class YAMLWarning extends YAMLError {
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constructor(pos, code, message) {
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super('YAMLWarning', pos, code, message);
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}
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}
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const prettifyError = (src, lc) => (error) => {
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if (error.pos[0] === -1)
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return;
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error.linePos = error.pos.map(pos => lc.linePos(pos));
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const { line, col } = error.linePos[0];
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error.message += ` at line ${line}, column ${col}`;
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let ci = col - 1;
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let lineStr = src
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.substring(lc.lineStarts[line - 1], lc.lineStarts[line])
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.replace(/[\n\r]+$/, '');
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// Trim to max 80 chars, keeping col position near the middle
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if (ci >= 60 && lineStr.length > 80) {
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const trimStart = Math.min(ci - 39, lineStr.length - 79);
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lineStr = '…' + lineStr.substring(trimStart);
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ci -= trimStart - 1;
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}
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if (lineStr.length > 80)
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lineStr = lineStr.substring(0, 79) + '…';
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// Include previous line in context if pointing at line start
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if (line > 1 && /^ *$/.test(lineStr.substring(0, ci))) {
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// Regexp won't match if start is trimmed
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let prev = src.substring(lc.lineStarts[line - 2], lc.lineStarts[line - 1]);
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if (prev.length > 80)
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prev = prev.substring(0, 79) + '…\n';
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lineStr = prev + lineStr;
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}
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if (/[^ ]/.test(lineStr)) {
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let count = 1;
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const end = error.linePos[1];
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if (end && end.line === line && end.col > col) {
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count = Math.max(1, Math.min(end.col - col, 80 - ci));
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}
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const pointer = ' '.repeat(ci) + '^'.repeat(count);
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error.message += `:\n\n${lineStr}\n${pointer}\n`;
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}
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};
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export { YAMLError, YAMLParseError, YAMLWarning, prettifyError };
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