astro/dist/core/errors/printer.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { normalizeLF } from "./utils.js";
function codeFrame(src, loc) {
  if (!loc || loc.line === void 0 || loc.column === void 0) {
    return "";
  }
  const lines = normalizeLF(src).split("\n").map((ln) => ln.replace(/\t/g, "  "));
  const visibleLines = [];
  for (let n = -2; n <= 2; n++) {
    if (lines[loc.line + n]) visibleLines.push(loc.line + n);
  }
  let gutterWidth = 0;
  for (const lineNo of visibleLines) {
    let w = `> ${lineNo}`;
    if (w.length > gutterWidth) gutterWidth = w.length;
  }
  let output = "";
  for (const lineNo of visibleLines) {
    const isFocusedLine = lineNo === loc.line - 1;
    output += isFocusedLine ? "> " : "  ";
    output += `${lineNo + 1} | ${lines[lineNo]}
`;
    if (isFocusedLine)
      output += `${Array.from({ length: gutterWidth }).join(" ")}  | ${Array.from({
        length: loc.column
      }).join(" ")}^
`;
  }
  return output;
}
export {
  codeFrame
};