Create ast package

smnp/ast/parsers/note.py

@@ -0,0 +1,38 @@
+import re
+
+from smnp.ast.node.note import NoteLiteralNode
+from smnp.note.model import Note
+from smnp.token.type import TokenType
+
+
+# note -> NOTE
+def parseNote(input, parent):
+    if input.current().type == TokenType.NOTE:
+        token = input.current()
+        value = token.value
+        consumedChars = 1
+        notePitch = value[consumedChars]
+        consumedChars += 1
+        octave = 4
+        duration = 4
+        dot = False
+        if consumedChars < len(value) and value[consumedChars] in ('b', '#'):
+            notePitch += value[consumedChars]
+            consumedChars += 1
+        if consumedChars < len(value) and re.match(r'\d', value[consumedChars]):
+            octave = int(value[consumedChars])
+            consumedChars += 1
+        if consumedChars < len(value) and value[consumedChars] == '.':
+            consumedChars += 1
+            durationString = ''
+            while consumedChars < len(value) and re.match(r'\d', value[consumedChars]):
+                durationString += value[consumedChars]
+                consumedChars += 1
+                duration = int(durationString)
+            if consumedChars < len(value) and value[consumedChars] == 'd':
+                dot = True
+                consumedChars += 1
+
+        input.ahead()
+        return NoteLiteralNode(Note(notePitch, octave, duration, dot), parent, token.pos)
+    return None