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