setHash()

in web/pdf_link_service.js [304:426]
113 lines of code
34 McCabe index (conditional complexity)

  setHash(hash) {
    if (!this.pdfDocument) {
      return;
    }
    let pageNumber, dest;
    if (hash.includes("=")) {
      const params = parseQueryString(hash);
      if (params.has("search")) {
        const query = params.get("search").replaceAll('"', ""),
          phrase = params.get("phrase") === "true";

        this.eventBus.dispatch("findfromurlhash", {
          source: this,
          query: phrase ? query : query.match(/\S+/g),
        });
      }
      // borrowing syntax from "Parameters for Opening PDF Files"
      if (params.has("page")) {
        pageNumber = params.get("page") | 0 || 1;
      }
      if (params.has("zoom")) {
        // Build the destination array.
        const zoomArgs = params.get("zoom").split(","); // scale,left,top
        const zoomArg = zoomArgs[0];
        const zoomArgNumber = parseFloat(zoomArg);

        if (!zoomArg.includes("Fit")) {
          // If the zoomArg is a number, it has to get divided by 100. If it's
          // a string, it should stay as it is.
          dest = [
            null,
            { name: "XYZ" },
            zoomArgs.length > 1 ? zoomArgs[1] | 0 : null,
            zoomArgs.length > 2 ? zoomArgs[2] | 0 : null,
            zoomArgNumber ? zoomArgNumber / 100 : zoomArg,
          ];
        } else if (zoomArg === "Fit" || zoomArg === "FitB") {
          dest = [null, { name: zoomArg }];
        } else if (
          zoomArg === "FitH" ||
          zoomArg === "FitBH" ||
          zoomArg === "FitV" ||
          zoomArg === "FitBV"
        ) {
          dest = [
            null,
            { name: zoomArg },
            zoomArgs.length > 1 ? zoomArgs[1] | 0 : null,
          ];
        } else if (zoomArg === "FitR") {
          if (zoomArgs.length !== 5) {
            console.error(
              'PDFLinkService.setHash: Not enough parameters for "FitR".'
            );
          } else {
            dest = [
              null,
              { name: zoomArg },
              zoomArgs[1] | 0,
              zoomArgs[2] | 0,
              zoomArgs[3] | 0,
              zoomArgs[4] | 0,
            ];
          }
        } else {
          console.error(
            `PDFLinkService.setHash: "${zoomArg}" is not a valid zoom value.`
          );
        }
      }
      if (dest) {
        this.pdfViewer.scrollPageIntoView({
          pageNumber: pageNumber || this.page,
          destArray: dest,
          allowNegativeOffset: true,
        });
      } else if (pageNumber) {
        this.page = pageNumber; // simple page
      }
      if (params.has("pagemode")) {
        this.eventBus.dispatch("pagemode", {
          source: this,
          mode: params.get("pagemode"),
        });
      }
      // Ensure that this parameter is *always* handled last, in order to
      // guarantee that it won't be overridden (e.g. by the "page" parameter).
      if (params.has("nameddest")) {
        this.goToDestination(params.get("nameddest"));
      }

      if (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) {
        return;
      }
      // Support opening of PDF attachments in the Firefox PDF Viewer,
      // which uses a couple of non-standard hash parameters; refer to
      // `DownloadManager.openOrDownloadData` in the firefoxcom.js file.
      if (!params.has("filename") || !params.has("filedest")) {
        return;
      }
      hash = params.get("filedest");
    }

    // Named (or explicit) destination.
    dest = unescape(hash);
    try {
      dest = JSON.parse(dest);

      if (!Array.isArray(dest)) {
        // Avoid incorrectly rejecting a valid named destination, such as
        // e.g. "4.3" or "true", because `JSON.parse` converted its type.
        dest = dest.toString();
      }
    } catch {}

    if (typeof dest === "string" || isValidExplicitDest(dest)) {
      this.goToDestination(dest);
      return;
    }
    console.error(
      `PDFLinkService.setHash: "${unescape(hash)}" is not a valid destination.`
    );
  }