Read the three directive forms, their attributes and the fences that nest them

src/markdown/parse/inline-content.ts

@@ -7,6 +7,7 @@ import { delimiterFlags, matchEmphasis, runLength } from '../emphasis-matching.t
 import { failure, success, type ConvertErrorPath, type Result } from '../../result.ts'
 import { mergeAdjacentText } from '../../adf/editor-normal.ts'
 import { normalizeLabel, readInlineTarget, readLabel } from '../link-syntax.ts'
+import { readInlineDirective, unknownDirectiveFault } from '../directive-syntax.ts'
 
 export type InlineContent = { image: AdfNode; nodes?: undefined } | { image?: undefined; nodes: AdfNode[] }
 
@@ -50,6 +51,12 @@ export function parseInlineContent(source: string, definitions: LinkDefinitions,
         index = angle.value
         break
       }
+      case ':': {
+        const directive = readDirective(scan, index)
+        if (!directive.ok) return directive
+        index = directive.value
+        break
+      }
       case '!':
       case '[':
         index = openBracket(scan, index)
@@ -131,6 +138,16 @@ function openBracket(scan: Scan, index: number): number {
   return index + width
 }
 
+function readDirective(scan: Scan, index: number): Result<number> {
+  const directive = readInlineDirective(scan.source, index)
+  if (directive === undefined) {
+    scan.pending += ':'
+    return success(index + 1)
+  }
+  const fault = directive.fault ?? unknownDirectiveFault(directive.value.name)
+  return failure(fault.code, fault.message, scan.path)
+}
+
 function flush(scan: Scan, strip: boolean): void {
   const raw = strip ? scan.pending.replace(trailingSpace, '') : scan.pending
   scan.pending = ''