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/** Die you stupid tabs */
function tabs_to_spaces(str: string) {
return str.replace(/^\t+/, (match) => match.split('\t').join(' '));
}
/** Display syntax error in pretty format in logs */
export default function get_code_frame(source: string, line: number, column: number) {
const lines = source.split('\n');
const frame_start = Math.max(0, line - 2);
const frame_end = Math.min(line + 3, lines.length);
const digits = String(frame_end + 1).length;
return lines
.slice(frame_start, frame_end)
.map((str, i) => {
const isErrorLine = frame_start + i === line;
const line_num = String(i + frame_start + 1).padStart(digits, ' ');
if (isErrorLine) {
const indicator = ' '.repeat(digits + 2 + tabs_to_spaces(str.slice(0, column)).length) + '^';
return `${line_num}: ${tabs_to_spaces(str)}\n${indicator}`;
}
return `${line_num}: ${tabs_to_spaces(str)}`;
})
.join('\n');
}
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