Create staff, measure and time signature parsers

app/src/main/kotlin/io/smnp/dsl/ast/model/node/MeasureNode.kt

@@ -0,0 +1,5 @@
+package io.smnp.dsl.ast.model.node
+
+import io.smnp.dsl.token.model.entity.TokenPosition
+
+class MeasureNode(items: List<Node>, position: TokenPosition) : AbstractIterableNode(items, position)

app/src/main/kotlin/io/smnp/dsl/ast/model/node/StaffNode.kt

@@ -0,0 +1,5 @@
+package io.smnp.dsl.ast.model.node
+
+import io.smnp.dsl.token.model.entity.TokenPosition
+
+class StaffNode(items: List<Node>, position: TokenPosition) : AbstractIterableNode(items, position)

app/src/main/kotlin/io/smnp/dsl/ast/model/node/TimeSignatureNode.kt

@@ -0,0 +1,14 @@
+package io.smnp.dsl.ast.model.node
+
+class TimeSignatureNode(numerator: Node, denominator: Node) : Node(2, numerator.position) {
+   val numerator: Node
+   get() = children[0]
+
+   val denominator: Node
+   get() = children[1]
+
+   init {
+      children[0] = numerator
+      children[1] = denominator
+   }
+}

app/src/main/kotlin/io/smnp/dsl/ast/parser/AtomParser.kt

@@ -15,6 +15,7 @@ class AtomParser : Parser() {
         val literalParser = oneOf(
             parenthesesParser,
             ComplexIdentifierParser(),
+            StaffParser(),
             ListParser(),
             LiteralParser(),
             MapParser()

app/src/main/kotlin/io/smnp/dsl/ast/parser/MeasureParser.kt

@@ -0,0 +1,17 @@
+package io.smnp.dsl.ast.parser
+
+import io.smnp.dsl.ast.model.entity.ParserOutput
+import io.smnp.dsl.ast.model.node.MeasureNode
+import io.smnp.dsl.token.model.entity.TokenList
+
+class MeasureParser : Parser() {
+
+   override fun tryToParse(input: TokenList): ParserOutput {
+      return repeat(
+         oneOf(
+            TimeSignatureParser(),
+            ExpressionParser()
+            )
+      ) { items, position -> MeasureNode(items, position) }.parse(input)
+   }
+}

app/src/main/kotlin/io/smnp/dsl/ast/parser/StaffParser.kt

@@ -0,0 +1,12 @@
+package io.smnp.dsl.ast.parser
+
+import io.smnp.dsl.ast.model.node.StaffNode
+import io.smnp.dsl.token.model.enumeration.TokenType
+
+class StaffParser : AbstractIterableParser(
+   TokenType.DOLLAR,
+   MeasureParser(),
+   TokenType.DOUBLE_PIPE,
+   TokenType.PIPE,
+   { items, position -> StaffNode(items, position) }
+)

app/src/main/kotlin/io/smnp/dsl/ast/parser/TimeSignatureParser.kt

@@ -0,0 +1,17 @@
+package io.smnp.dsl.ast.parser
+
+import io.smnp.dsl.ast.model.entity.ParserOutput
+import io.smnp.dsl.ast.model.node.TimeSignatureNode
+import io.smnp.dsl.token.model.entity.TokenList
+import io.smnp.dsl.token.model.enumeration.TokenType
+
+class TimeSignatureParser : Parser() {
+
+   override fun tryToParse(input: TokenList): ParserOutput {
+      return allOf(
+         IntegerLiteralParser(),
+         terminal(TokenType.SLASH),
+         IntegerLiteralParser()
+      ) { (numerator, _, denominator) -> TimeSignatureNode(numerator, denominator) }.parse(input)
+   }
+}