@stryke/json/dist/utils/code-frames.mjs

A package containing JSON parsing/stringify utilities used by Storm Software.

//#region src/utils/code-frames.ts
/**
* RegExp to test for newlines in terminal.
*/
const NEWLINE = /\r\n|[\n\r\u2028\u2029]/;
/**
* Extract what lines should be marked and highlighted.
*/
function getMarkerLines(loc, source, opts = {}) {
	const startLoc = {
		column: 0,
		line: -1,
		...loc.start
	};
	const endLoc = {
		...startLoc,
		...loc.end
	};
	const { linesAbove = 2, linesBelow = 3 } = opts || {};
	const startLine = startLoc.line;
	const startColumn = startLoc.column;
	const endLine = endLoc.line;
	const endColumn = endLoc.column;
	let start = Math.max(startLine - (linesAbove + 1), 0);
	let end = Math.min(source.length, endLine + linesBelow);
	if (startLine === -1) start = 0;
	if (endLine === -1) end = source.length;
	const lineDiff = endLine - startLine;
	const markerLines = {};
	if (lineDiff) for (let i = 0; i <= lineDiff; i++) {
		const lineNumber = i + startLine;
		if (!startColumn) markerLines[lineNumber] = true;
		else if (i === 0) markerLines[lineNumber] = [startColumn, (source[lineNumber - 1]?.length ?? 0) - startColumn + 1];
		else if (i === lineDiff) markerLines[lineNumber] = [0, endColumn];
		else markerLines[lineNumber] = [0, source[lineNumber - i]?.length ?? 0];
	}
	else if (startColumn === endColumn) markerLines[startLine] = startColumn ? [startColumn, 0] : true;
	else markerLines[startLine] = [startColumn, endColumn - startColumn];
	return {
		start,
		end,
		markerLines
	};
}
function codeFrameColumns(rawLines, loc, opts = {}) {
	const { start, end, markerLines } = getMarkerLines(loc, rawLines.split(NEWLINE), opts);
	const numberMaxWidth = String(end).length;
	return (opts.highlight ? opts.highlight(rawLines) : rawLines).split(NEWLINE).slice(start, end).map((line, index) => {
		const number = start + 1 + index;
		const gutter = ` ${` ${number}`.slice(-numberMaxWidth)} | `;
		const hasMarker = Boolean(markerLines[number] ?? false);
		if (hasMarker) {
			let markerLine = "";
			if (Array.isArray(hasMarker)) {
				const markerSpacing = line.slice(0, Math.max(hasMarker[0] - 1, 0)).replace(/[^\t]/g, " ");
				const numberOfMarkers = hasMarker[1] || 1;
				markerLine = [
					"\n ",
					gutter.replace(/\d/g, " "),
					markerSpacing,
					"^".repeat(numberOfMarkers)
				].join("");
			}
			return [
				">",
				gutter,
				line,
				markerLine
			].join("");
		}
		return ` ${gutter}${line}`;
	}).join("\n");
}

//#endregion
export { codeFrameColumns };
//# sourceMappingURL=code-frames.mjs.map