1. Top
  2. gitea
  3. Files
  4. web_src
  5. js
  6. markup
  7. mermaid.js
gitea

Development moved to Codeberg

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
  21. 21
  22. 22
  23. 23
  24. 24
  25. 25
  26. 26
  27. 27
  28. 28
  29. 29
  30. 30
  31. 31
  32. 32
  33. 33
  34. 34
  35. 35
  36. 36
  37. 37
  38. 38
  39. 39
  40. 40
  41. 41
  42. 42
  43. 43
  44. 44
  45. 45
  46. 46
  47. 47
  48. 48
  49. 49
  50. 50
  51. 51
  52. 52
  53. 53
  54. 54
  55. 55
  56. 56
  57. 57
  58. 58
  59. 59
  60. 60
  61. 61
  62. 62
  63. 63
  64. 64
  65. 65
  66. 66 
import {isDarkTheme} from '../utils.js';
const {mermaidMaxSourceCharacters} = window.config;

const iframeCss = `
  body {margin: 0; padding: 0}
  #mermaid {display: block; margin: 0 auto}
`;

function displayError(el, err) {
  el.closest('pre').classList.remove('is-loading');
  const errorNode = document.createElement('div');
  errorNode.setAttribute('class', 'ui message error markup-block-error mono');
  errorNode.textContent = err.str || err.message || String(err);
  el.closest('pre').before(errorNode);
}

export async function renderMermaid() {
  const els = document.querySelectorAll('.markup code.language-mermaid');
  if (!els.length) return;

  const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');

  mermaid.initialize({
    startOnLoad: false,
    theme: isDarkTheme() ? 'dark' : 'neutral',
    securityLevel: 'strict',
  });

  for (const el of els) {
    const source = el.textContent;

    if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
      displayError(el, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
      continue;
    }

    let valid;
    try {
      valid = mermaid.parse(source);
    } catch (err) {
      displayError(el, err);
    }

    if (!valid) {
      el.closest('pre').classList.remove('is-loading');
      continue;
    }

    try {
      // can't use bindFunctions here because we can't cross the iframe boundary. This
      // means js-based interactions won't work but they aren't intended to work either
      mermaid.mermaidAPI.render('mermaid', source, (svgStr) => {
        const heightStr = (svgStr.match(/height="(.+?)"/) || [])[1];
        if (!heightStr) return displayError(el, new Error('Could not determine chart height'));
        const iframe = document.createElement('iframe');
        iframe.classList.add('markup-render');
        iframe.sandbox = 'allow-scripts';
        iframe.style.height = `${Math.ceil(parseFloat(heightStr))}px`;
        iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svgStr}</body></html>`;
        el.closest('pre').replaceWith(iframe);
      });
    } catch (err) {
      displayError(el, err);
    }
  }
}