Improving youtube link parser and adding yaml metadata parser and example class.

src/MiniDocs/HedgeDocGrammar.class.st

@@ -9,11 +9,22 @@ Class {
 
 { #category : #accessing }
 HedgeDocGrammar >> start [
-	^ #any asPParser starLazy
+	| any |
+	any := #any asPParser.
+	^ (self yamlMetadata / any starLazy), self youtubeEmbeddedLink
+]
+
+{ #category : #accessing }
+HedgeDocGrammar >> yamlMetadata [
+	"I parse the header of the hedgedoc document for YAML metadata."
+	^ '---' asPParser token trim, #any asPParser starLazy token, '---' asPParser token trim
 ]
 
 { #category : #accessing }
 HedgeDocGrammar >> youtubeEmbeddedLink [
-	"I parse a youtube embedded link in a hedgedoc document."
-	^ '{%youtube' asPParser token trim, #any asPParser starLazy token, '%}' asPParser token trim
+	"I parse the youtube embedded links in a hedgedoc document."
+	| link linkSea |
+	link := '{%youtube' asPParser token trim, #any asPParser starLazy token, '%}' asPParser token trim.
+	linkSea := link sea ==> #second.
+	^ linkSea star
 ]

src/MiniDocs/HedgeDocGrammarExamples.class.st

@@ -0,0 +1,19 @@
+Class {
+	#name : #HedgeDocGrammarExamples,
+	#superclass : #Object,
+	#category : #MiniDocs
+}
+
+{ #category : #accessing }
+HedgeDocGrammarExamples >> hedgeDocParseYoutubeEmbeddedLinkExample [
+	<gtExample>
+	| aSampleString parsedString parsedCollection |
+	aSampleString := '{%youtube 1aw3XmTqFXA %}'.
+	parsedString := HedgeDocGrammar new youtubeEmbeddedLink parse: aSampleString.
+	parsedCollection := parsedString first.
+	self assert: parsedCollection size equals: 3.
+	self assert: parsedCollection first value equals: '{%youtube'.
+	self assert: parsedCollection second class equals: PP2Token.
+	self assert: parsedCollection third value equals: '%}'.
+	^ parsedString
+]