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67 lines
2.2 KiB
67 lines
2.2 KiB
4 months ago
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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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