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66 lines
2.2 KiB
66 lines
2.2 KiB
import { getLocation } from './location.mjs'; |
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/** |
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* Render a helpful description of the location in the GraphQL Source document. |
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*/ |
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export function printLocation(location) { |
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return printSourceLocation( |
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location.source, |
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getLocation(location.source, location.start), |
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); |
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} |
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/** |
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* Render a helpful description of the location in the GraphQL Source document. |
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*/ |
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export function printSourceLocation(source, sourceLocation) { |
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const firstLineColumnOffset = source.locationOffset.column - 1; |
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const body = ''.padStart(firstLineColumnOffset) + source.body; |
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const lineIndex = sourceLocation.line - 1; |
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const lineOffset = source.locationOffset.line - 1; |
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const lineNum = sourceLocation.line + lineOffset; |
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const columnOffset = sourceLocation.line === 1 ? firstLineColumnOffset : 0; |
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const columnNum = sourceLocation.column + columnOffset; |
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const locationStr = `${source.name}:${lineNum}:${columnNum}\n`; |
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const lines = body.split(/\r\n|[\n\r]/g); |
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const locationLine = lines[lineIndex]; // Special case for minified documents |
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if (locationLine.length > 120) { |
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const subLineIndex = Math.floor(columnNum / 80); |
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const subLineColumnNum = columnNum % 80; |
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const subLines = []; |
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for (let i = 0; i < locationLine.length; i += 80) { |
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subLines.push(locationLine.slice(i, i + 80)); |
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} |
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return ( |
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locationStr + |
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printPrefixedLines([ |
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[`${lineNum} |`, subLines[0]], |
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...subLines.slice(1, subLineIndex + 1).map((subLine) => ['|', subLine]), |
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['|', '^'.padStart(subLineColumnNum)], |
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['|', subLines[subLineIndex + 1]], |
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]) |
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); |
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} |
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return ( |
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locationStr + |
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printPrefixedLines([ |
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// Lines specified like this: ["prefix", "string"], |
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[`${lineNum - 1} |`, lines[lineIndex - 1]], |
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[`${lineNum} |`, locationLine], |
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['|', '^'.padStart(columnNum)], |
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[`${lineNum + 1} |`, lines[lineIndex + 1]], |
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]) |
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); |
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} |
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function printPrefixedLines(lines) { |
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const existingLines = lines.filter(([_, line]) => line !== undefined); |
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const padLen = Math.max(...existingLines.map(([prefix]) => prefix.length)); |
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return existingLines |
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.map(([prefix, line]) => prefix.padStart(padLen) + (line ? ' ' + line : '')) |
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.join('\n'); |
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}
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