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