MusicXML: \partial export as pickup measure

ly/musicxml/create_musicxml.py

@@ -112,8 +112,10 @@ def create_part(self, name="unnamed", abbr=False, midi=False):
         self.part_count += 1
         self.bar_nr = 1
 
-    def create_measure(self, **bar_attrs):
+    def create_measure(self, pickup = False, **bar_attrs):
         """Create new measure """
+        if pickup and self.bar_nr == 1:
+            self.bar_nr = 0
         self.current_bar = etree.SubElement(self.current_part, "measure", number=str(self.bar_nr))
         self.bar_nr +=1
         if bar_attrs:

ly/musicxml/ly2xml_mediator.py

@@ -76,6 +76,7 @@ def __init__(self):
         self.prev_tremolo = 8
         self.tupl_dur = 0
         self.tupl_sum = 0
+        self.bar_is_pickup = False
 
     def new_header_assignment(self, name, value):
         """Distributing header information."""
@@ -309,11 +310,17 @@ def get_first_var(self):
         if self.sections:
             return self.sections[0].barlist
 
+    def set_pickup(self):
+        self.bar_is_pickup = True
+
     def new_bar(self, fill_prev=True):
         if self.bar and fill_prev:
             self.bar.list_full = True
         self.current_attr = xml_objs.BarAttr()
         self.bar = xml_objs.Bar()
+        if self.bar_is_pickup:
+            self.bar.pickup = True
+            self.bar_is_pickup = False
         self.bar.obj_list = [self.current_attr]
         self.insert_into.barlist.append(self.bar)
 

ly/musicxml/lymus2musxml.py

@@ -89,6 +89,7 @@ def __init__(self):
         self.slurcount = 0
         self.slurnr = 0
         self.phrslurnr = 0
+        self.pickup = False
 
     def parse_text(self, ly_text, filename=None):
         """Parse the LilyPond source specified as text.
@@ -266,6 +267,9 @@ def Relative(self, relative):
         r"""A \relative music expression."""
         self.relative = True
 
+    def Partial(self, partial):
+        self.pickup = True
+
     def Note(self, note):
         """ notename, e.g. c, cis, a bes ... """
         #print(note.token)
@@ -340,6 +344,9 @@ def Duration(self, duration):
         elif self.tupl_span:
             self.mediator.set_tuplspan_dur(duration.token, duration.tokens)
             self.tupl_span = False
+        elif self.pickup:
+            self.mediator.set_pickup()
+            self.pickup = False
         else:
             self.mediator.new_duration_token(duration.token, duration.tokens)
             if self.trem_rep:

ly/musicxml/xml_objs.py

@@ -102,7 +102,7 @@ def iterate_part(self, part):
 
     def iterate_bar(self, bar):
         """The objects in the bar are output to the xml-file."""
-        self.musxml.create_measure()
+        self.musxml.create_measure(pickup = bar.pickup)
         for obj in bar.obj_list:
             if isinstance(obj, BarAttr):
                 self.new_xml_bar_attr(obj)
@@ -432,6 +432,7 @@ class Bar():
     Contains also information about how complete it is."""
     def __init__(self):
         self.obj_list = []
+        self.pickup = False
         self.list_full = False
 
     def __repr__(self):

tests/test_xml.py

@@ -31,6 +31,10 @@ def test_tuplet():
     compare_output('tuplet')
 
 
+def test_partial():
+    compare_output('partial')
+
+
 def ly_to_xml(filename):
     """Read Lilypond file and return XML string."""
     writer = ly.musicxml.writer()

tests/test_xml_files/partial.ly

@@ -0,0 +1,5 @@
+score{
+  \partial 8 f8 |
+  c2 d2 |
+  \partial 8 f8
+}

tests/test_xml_files/partial.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 2.0 Partwise//EN"
+                                "http://www.musicxml.org/dtds/partwise.dtd">
+<score-partwise version="3.0">
+  <identification>
+    <encoding>
+      <software>python-ly 0.9.5</software>
+      <encoding-date>2017-05-28</encoding-date>
+    </encoding>
+  </identification>
+  <part-list>
+    <score-part id="P1">
+      <part-name />
+    </score-part>
+  </part-list>
+  <part id="P1">
+    <measure number="0">
+      <attributes>
+        <divisions>2</divisions>
+        <time symbol="common">
+          <beats>4</beats>
+          <beat-type>4</beat-type>
+        </time>
+        <clef>
+          <sign>G</sign>
+          <line>2</line>
+        </clef>
+      </attributes>
+      <note>
+        <pitch>
+          <step>F</step>
+          <octave>3</octave>
+        </pitch>
+        <duration>1</duration>
+        <voice>1</voice>
+        <type>eighth</type>
+      </note>
+    </measure>
+    <measure number="1">
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>3</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>half</type>
+      </note>
+      <note>
+        <pitch>
+          <step>D</step>
+          <octave>3</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>half</type>
+      </note>
+    </measure>
+    <measure number="2">
+      <note>
+        <pitch>
+          <step>F</step>
+          <octave>3</octave>
+        </pitch>
+        <duration>1</duration>
+        <voice>1</voice>
+        <type>eighth</type>
+      </note>
+    </measure>
+  </part>
+</score-partwise>