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30 lines
664 B
30 lines
664 B
import { invariant } from '../jsutils/invariant.mjs'; |
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const LineRegExp = /\r\n|[\n\r]/g; |
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/** |
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* Represents a location in a Source. |
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*/ |
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/** |
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* Takes a Source and a UTF-8 character offset, and returns the corresponding |
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* line and column as a SourceLocation. |
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*/ |
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export function getLocation(source, position) { |
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let lastLineStart = 0; |
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let line = 1; |
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for (const match of source.body.matchAll(LineRegExp)) { |
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typeof match.index === 'number' || invariant(false); |
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if (match.index >= position) { |
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break; |
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} |
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lastLineStart = match.index + match[0].length; |
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line += 1; |
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} |
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return { |
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line, |
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column: position + 1 - lastLineStart, |
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}; |
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}
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