Function processNextChars

src/node/utils/ExportHtml.ts:211–272

(numChars: number)

    let idx = 0;

    const processNextChars = (numChars: number) => {
      if (numChars <= 0) {
        return;
      }

      // @ts-ignore
      const ops = deserializeOps(subattribution(attribs, idx, idx + numChars));
      idx += numChars;

      // this iterates over every op string and decides which tags to open or to close
      // based on the attribs used
      for (const o of ops) {
        const usedAttribs:string[] = [];

        // mark all attribs as used
        for (const a of attributes.decodeAttribString(o.attribs)) {
          if (a in anumMap) {
            usedAttribs.push(String(anumMap[a])); // i = 0 => bold, etc.
          }
        }
        let outermostTag = -1;
        // find the outer most open tag that is no longer used
        for (let i = openTags.length - 1; i >= 0; i--) {
          if (usedAttribs.indexOf(openTags[i]) === -1) {
            outermostTag = i;
            break;
          }
        }

        // close all tags upto the outer most
        if (outermostTag !== -1) {
          while (outermostTag >= 0) {
            emitCloseTag(openTags[0]);
            outermostTag--;
          }
        }

        // open all tags that are used but not open
        for (let i = 0; i < usedAttribs.length; i++) {
          if (openTags.indexOf(usedAttribs[i]) === -1) {
            emitOpenTag(usedAttribs[i]);
          }
        }

        let chars = o.chars;
        if (o.lines) {
          chars--; // exclude newline at end of line, if present
        }

        let s = taker.take(chars);

        // form feed (0x0C) is a legacy control char with no meaning in HTML
        s = s.replace(String.fromCharCode(12), '');

        assem.append(_encodeWhitespace(Security.escapeHTML(s)));
      } // end iteration over spans in line

      // close all the tags that are open after the last op