Method readFile

deps/v8/tools/heap-stats/trace-file-reader.js:57–116

(file)

  }

  readFile(file) {
    if (!file) {
      this.updateLabel('Failed to load file.');
      return;
    }
    this.$('#fileReader').blur();

    this.section.className = 'loading';
    const reader = new FileReader();

    if (['application/gzip', 'application/x-gzip'].includes(file.type)) {
      reader.onload = (e) => {
        try {
          const textResult = pako.inflate(e.target.result, {to: 'string'});
          this.processRawText(file, textResult);
          this.section.className = 'success';
          this.$('#fileReader').classList.add('done');
        } catch (err) {
          console.error(err);
          this.section.className = 'failure';
        }
      };
      // Delay the loading a bit to allow for CSS animations to happen.
      setTimeout(() => reader.readAsArrayBuffer(file), 0);
    } else if (file.type == 'text/html') {
      // try extracting the data from a results.html file
      reader.onload = (e) => {
        try {
          let html = document.createElement('html');
          html.innerHTML = e.target.result;
          for (let dataScript of html.querySelectorAll('#viewer-data')) {
            const base64 = dataScript.innerText.slice(1,-1);
            const binary = globalThis.atob(base64);
            const textResult = pako.inflate(binary, {to: 'string'});
            this.processRawText(file, textResult);
          }
          this.section.className = 'success';
          this.$('#fileReader').classList.add('done');
        } catch (err) {
          console.error(err);
          this.section.className = 'failure';
        }
      };
      // Delay the loading a bit to allow for CSS animations to happen.
      setTimeout(() => reader.readAsText(file), 0);
    } else {
      reader.onload = (e) => {
        try {
          this.processRawText(file, e.target.result);
          this.section.className = 'success';
          this.$('#fileReader').classList.add('done');
        } catch (err) {
          console.error(err);
          this.section.className = 'failure';
        }
      };
      // Delay the loading a bit to allow for CSS animations to happen.
      setTimeout(() => reader.readAsText(file), 0);