Method join

lib/lines.ts:619–693

(elements: (string | Lines)[])

  }

  join(elements: (string | Lines)[]) {
    const separator = this;
    const infos: any[] = [];
    const mappings: any[] = [];
    let prevInfo: any;

    function appendLines(linesOrNull: Lines | null) {
      if (linesOrNull === null) {
        return;
      }

      if (prevInfo) {
        const info = linesOrNull.infos[0];
        const indent = new Array(info.indent + 1).join(" ");
        const prevLine = infos.length;
        const prevColumn =
          Math.max(prevInfo.indent, 0) +
          prevInfo.sliceEnd -
          prevInfo.sliceStart;

        prevInfo.line =
          prevInfo.line.slice(0, prevInfo.sliceEnd) +
          indent +
          info.line.slice(info.sliceStart, info.sliceEnd);

        // If any part of a line is indentation-locked, the whole line
        // will be indentation-locked.
        prevInfo.locked = prevInfo.locked || info.locked;

        prevInfo.sliceEnd = prevInfo.line.length;

        if (linesOrNull.mappings.length > 0) {
          linesOrNull.mappings.forEach(function (mapping: any) {
            mappings.push(mapping.add(prevLine, prevColumn));
          });
        }
      } else if (linesOrNull.mappings.length > 0) {
        mappings.push.apply(mappings, linesOrNull.mappings);
      }

      linesOrNull.infos.forEach(function (info: any, i: any) {
        if (!prevInfo || i > 0) {
          prevInfo = { ...info };
          infos.push(prevInfo);
        }
      });
    }

    function appendWithSeparator(linesOrNull: Lines | null, i: number) {
      if (i > 0) appendLines(separator);
      appendLines(linesOrNull);
    }

    elements
      .map(function (elem: any) {
        const lines = fromString(elem);
        if (lines.isEmpty()) return null;
        return lines;