forgejo-federation/web_src/js/markup/mermaid.js
zeripath f135a818f5
Make Mermaid.js limit configurable (#16519)
* Make Mermaid.js limit configurable

Add `MERMAID_MAX_SOURCE_CHARACTERS` to `[markup]` settings
to make the maximum size of a mermaid render configurable.

Fix #16513

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fixup! Make Mermaid.js limit configurable

* Update custom/conf/app.example.ini

Co-authored-by: silverwind <me@silverwind.io>

* Update docs/content/doc/advanced/config-cheat-sheet.en-us.md

Co-authored-by: silverwind <me@silverwind.io>

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
2021-07-24 00:21:51 -04:00

56 lines
1.5 KiB
JavaScript

const {MermaidMaxSourceCharacters} = window.config;
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(els) {
if (!els || !els.length) return;
const mermaid = await import(/* webpackChunkName: "mermaid" */'mermaid');
mermaid.initialize({
mermaid: {
startOnLoad: false,
},
flowchart: {
useMaxWidth: true,
htmlLabels: false,
},
theme: 'neutral',
securityLevel: 'strict',
});
for (const el of els) {
if (MermaidMaxSourceCharacters >= 0 && el.textContent.length > MermaidMaxSourceCharacters) {
displayError(el, new Error(`Mermaid source of ${el.textContent.length} characters exceeds the maximum allowed length of ${MermaidMaxSourceCharacters}.`));
continue;
}
let valid;
try {
valid = mermaid.parse(el.textContent);
} catch (err) {
displayError(el, err);
}
if (!valid) {
el.closest('pre').classList.remove('is-loading');
continue;
}
try {
mermaid.init(undefined, el, (id) => {
const svg = document.getElementById(id);
svg.classList.add('mermaid-chart');
svg.closest('pre').replaceWith(svg);
});
} catch (err) {
displayError(el, err);
}
}
}