Function blankLoneMacroLines

src/extraction/languages/c-cpp.ts:551–578

(source: string)

const LONE_MACRO_LINE_RE = /^[ \t]*([A-Z][A-Z0-9_]{3,})[ \t]*(?:\/\/[^\n\r]*|\/\*[^\n\r]*\*\/[ \t]*)?\r?$/;
const LONE_MACRO_CONTINUATION_END_RE = /[=+\-*/%&|^<>?:,(\\]$/;
export function blankLoneMacroLines(source: string): string {
  if (!/^[ \t]*[A-Z][A-Z0-9_]{3,}[ \t]*\r?$/m.test(source)) return source;
  const lines = source.split('\n');
  const content = (l: string): string => l.replace(/\r$/, '').trim();
  let changed = false;
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i] as string;
    const m = LONE_MACRO_LINE_RE.exec(line);
    if (!m) continue;
    // Underscore requirement rides the macro convention (FMT_BEGIN_NAMESPACE,
    // Q_OBJECT); a solid all-caps word (`NDEBUG`-style) alone is too risky.
    if (!(m[1] as string).includes('_')) continue;
    let prev = i - 1;
    while (prev >= 0 && content(lines[prev] as string) === '') prev--;
    if (prev >= 0 && LONE_MACRO_CONTINUATION_END_RE.test(content(lines[prev] as string))) continue;
    let next = i + 1;
    while (next < lines.length && content(lines[next] as string) === '') next++;
    if (next < lines.length) {
      const first = content(lines[next] as string)[0];
      if (!first || !/[A-Za-z_#{}~]/.test(first)) continue;
    }
    const start = line.indexOf(m[1] as string);
    lines[i] =
      line.slice(0, start) + ' '.repeat((m[1] as string).length) + line.slice(start + (m[1] as string).length);
    changed = true;
  }
  return changed ? lines.join('\n') : source;
}

/**
 * Blank an export/visibility macro sitting in front of a *member* or *method*