feat: 枠線をつけるMFMを追加 (#12981)

* Update MkMisskeyFlavoredMarkdown.ts

* Update const.ts

* Update MkMisskeyFlavoredMarkdown.ts

* Update MkMisskeyFlavoredMarkdown.ts

* Update CHANGELOG.md

1 files changed, 23 insertions, 5 deletions

diff --git a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
index 650c79dff7..f55069200d 100644
--- a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
+++ b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
@@ -61,7 +61,12 @@ export default function(props: MfmProps, context: SetupContext<MfmEvents>) {
 		if (t == null) return null;
 		return t.match(/^[0-9.]+s$/) ? t : null;
 	};
-
+	
+	const validColor = (c: string | null | undefined): string | null => {
+		if (c == null) return null;
+		return c.match(/^[0-9a-f]{3,6}$/i) ? c : null;
+	};
+	
 	const useAnim = defaultStore.state.advancedMfm && defaultStore.state.animatedMfm;
 
 	/**
@@ -240,17 +245,30 @@ export default function(props: MfmProps, context: SetupContext<MfmEvents>) {
 						break;
 					}
 					case 'fg': {
-						let color = token.props.args.color;
-						if (!/^[0-9a-f]{3,6}$/i.test(color)) color = 'f00';
+						let color = validColor(token.props.args.color);
+						color = color ?? 'f00';
 						style = `color: #${color}; overflow-wrap: anywhere;`;
 						break;
 					}
 					case 'bg': {
-						let color = token.props.args.color;
-						if (!/^[0-9a-f]{3,6}$/i.test(color)) color = 'f00';
+						let color = validColor(token.props.args.color);
+						color = color ?? 'f00';
 						style = `background-color: #${color}; overflow-wrap: anywhere;`;
 						break;
 					}
+					case 'border': {
+						let color = validColor(token.props.args.color);
+						color = color ? `#${color}` : 'var(--accent)';
+						let b_style = token.props.args.style;
+						if (
+							!['hidden', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge', 'inset', 'outset']
+								.includes(b_style)
+						) b_style = 'solid';
+						const width = parseFloat(token.props.args.width ?? '1');
+						const radius = parseFloat(token.props.args.radius ?? '0');
+						style = `border: ${width}px ${b_style} ${color}; border-radius: ${radius}px`;
+						break;
+					}
 					case 'ruby': {
 						if (token.children.length === 1) {
 							const child = token.children[0];