80 lines
3.0 KiB
JavaScript
80 lines
3.0 KiB
JavaScript
import * as kl from 'kolorist';
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/**
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* Convert tabs indentation to two spaces.
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*/
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function tabs2Spaces(str) {
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return str.replace(/^\t+/, tabs => ' '.repeat(tabs.length));
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}
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/**
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* Generate an excerpt of the location in the source around the
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* specified position.
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*/
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export function createCodeFrame(text, lineNum, columnNum, { before = 2, after = 3, colors = true, maxWidth = 0, lineMarkerChar = '▶', seperatorChar = '│', columnMarkerChar = '▲' } = {}) {
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const lines = text.split('\n');
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const start = Math.max(0, lineNum - before);
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const end = Math.min(lines.length, lineNum + after + 1);
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// Maximum space needed for line numbering in the current range.
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// Necessary when the amount of digits of the line numbering grows:
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// 999 | asdf
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// 1000 | asdjadfjsa
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const maxLineNum = String(end).length;
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const padding = ' '.repeat(maxLineNum);
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// Normalize all indentation (=tabs) to use 2 spaces. We need to
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// apply the difference to the marker position to move it back in
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// place.
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const spaceLines = [];
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let maxLineLen = 0;
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for (let i = start; i < end; i++) {
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const line = tabs2Spaces(lines[i]);
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spaceLines.push(line);
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if (line.length > maxLineLen)
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maxLineLen = line.length;
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}
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const activeLine = spaceLines[lineNum - start];
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// Move marker into correct place by taking the amount of
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// normalized tabs into account
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const count = Math.max(0, activeLine.length - lines[lineNum].length + columnNum);
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const maxLensWidth = maxWidth - '> '.length - padding.length - ' | '.length;
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let left = 0;
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let right = maxLensWidth;
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if (maxWidth > 0) {
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const half = Math.floor(maxLensWidth / 2);
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let winLeft = count - half;
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if (winLeft > 0) {
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let winRight = count + half - 1;
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left = winLeft;
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right = winRight;
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if (winRight > maxLensWidth) {
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const offset = Math.min(0, winRight - maxLensWidth);
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left -= offset;
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right -= offset;
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}
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}
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}
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const sep = kl.dim(seperatorChar);
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let out = '';
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for (let i = 0; i < spaceLines.length; i++) {
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const line = spaceLines[i];
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const currentLine = kl.dim((padding + (i + start + 1)).slice(-maxLineNum));
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let formatted = line;
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if (maxWidth > 0) {
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formatted = formatted.slice(left, Math.min(right, line.length));
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if (left > 0) {
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formatted = '…' + formatted;
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}
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if (line.length > right) {
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formatted += '…';
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}
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}
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// Line where the error occured
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if (i === lineNum - start) {
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out += kl.red(lineMarkerChar) + ` ${currentLine} ${sep} ${formatted}\n`;
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out += ` ${padding} ${sep} ${' '.repeat(count - left)}${kl.bold(kl.red(columnMarkerChar))}\n`;
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}
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else {
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out += ` ${currentLine} ${sep} ${formatted}\n`;
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}
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}
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return colors ? out : kl.stripColors(out);
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}
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//# sourceMappingURL=index.js.map
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