Function sourceFragment

package/svelte/compiler.js:7972–8005

(error2, extraLines)

  var OFFSET_CORRECTION = 60;
  var TAB_REPLACEMENT = "    ";
  function sourceFragment(error2, extraLines) {
    function processLines(start, end) {
      return lines.slice(start, end).map(function(line2, idx) {
        var num = String(start + idx + 1);
        while (num.length < maxNumLength) {
          num = " " + num;
        }
        return num + " |" + line2;
      }).join("\n");
    }
    var lines = error2.source.split(/\r\n?|\n|\f/);
    var line = error2.line;
    var column = error2.column;
    var startLine = Math.max(1, line - extraLines) - 1;
    var endLine = Math.min(line + extraLines, lines.length + 1);
    var maxNumLength = Math.max(4, String(endLine).length) + 1;
    var cutLeft = 0;
    column += (TAB_REPLACEMENT.length - 1) * (lines[line - 1].substr(0, column - 1).match(/\t/g) || []).length;
    if (column > MAX_LINE_LENGTH) {
      cutLeft = column - OFFSET_CORRECTION + 3;
      column = OFFSET_CORRECTION - 2;
    }
    for (var i = startLine; i <= endLine; i++) {
      if (i >= 0 && i < lines.length) {
        lines[i] = lines[i].replace(/\t/g, TAB_REPLACEMENT);
        lines[i] = (cutLeft > 0 && lines[i].length > cutLeft ? "\u2026" : "") + lines[i].substr(cutLeft, MAX_LINE_LENGTH - 2) + (lines[i].length > cutLeft + MAX_LINE_LENGTH - 1 ? "\u2026" : "");
      }
    }
    return [
      processLines(startLine, line),
      new Array(column + maxNumLength + 2).join("-") + "^",
      processLines(line, endLine)
    ].filter(Boolean).join("\n");
  }
  var SyntaxError$1 = function(message, source, offset2, line, column) {
    var error2 = createCustomError("SyntaxError", message);
    error2.source = source;