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57 lines
2.0 KiB
57 lines
2.0 KiB
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 && /^ *$/.test(lineStr.substring(0, ci))) { |
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// Regexp won't match if start is trimmed |
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let prev = src.substring(lc.lineStarts[line - 2], lc.lineStarts[line - 1]); |
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if (prev.length > 80) |
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prev = prev.substring(0, 79) + '…\n'; |
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lineStr = prev + lineStr; |
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} |
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if (/[^ ]/.test(lineStr)) { |
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let count = 1; |
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const end = error.linePos[1]; |
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if (end && end.line === line && end.col > col) { |
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count = Math.min(end.col - col, 80 - ci); |
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} |
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const pointer = ' '.repeat(ci) + '^'.repeat(count); |
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error.message += `:\n\n${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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