MusicXML: recognize \break

ly/musicxml/create_musicxml.py

@@ -115,6 +115,7 @@ def create_part(self, name="unnamed", abbr=False, midi=False):
     def create_measure(self, **bar_attrs):
         """Create new measure """
         self.current_bar = etree.SubElement(self.current_part, "measure", number=str(self.bar_nr))
+        self.current_print = None
         self.bar_nr +=1
         if bar_attrs:
             self.new_bar_attr(**bar_attrs)
@@ -627,6 +628,13 @@ def add_lyric(self, txt, syll, nr, ext=False):
         if ext:
             etree.SubElement(lyricnode, "extend")
 
+    def new_system(self):
+        if not self.current_print:
+            self.create_print()
+        self.current_print.attrib["new-system"] = "yes"
+
+    def create_print(self):
+        self.current_print = etree.SubElement(self.current_bar, "print")
 
     ##
     # Create the XML document

ly/musicxml/ly2xml_mediator.py

@@ -829,6 +829,10 @@ def new_lyrics_item(self, item):
         elif item == '\\skip':
             self.insert_into.barlist.append("skip")
 
+    def line_break(self):
+        if self.bar:
+            self.bar.line_break = True
+
     def duration_from_tokens(self, tokens):
         """Calculate dots and multibar rests from tokens."""
         dots = 0

ly/musicxml/lymus2musxml.py

@@ -497,6 +497,8 @@ def Command(self, command):
             if self.tupl_span:
                 self.mediator.unset_tuplspan_dur()
                 self.tupl_span = False
+        elif command.token == '\\break':
+            self.mediator.line_break()
         else:
             if command.token not in excls:
                 print("Unknown command:", command.token)

ly/musicxml/xml_objs.py

@@ -103,6 +103,10 @@ 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()
+
+        if bar.line_break:
+            self.musxml.new_system()
+
         for obj in bar.obj_list:
             if isinstance(obj, BarAttr):
                 self.new_xml_bar_attr(obj)
@@ -433,6 +437,7 @@ class Bar():
     def __init__(self):
         self.obj_list = []
         self.list_full = False
+        self.line_break = False
 
     def __repr__(self):
         return '<{0} {1}>'.format(self.__class__.__name__, self.obj_list)
@@ -478,6 +483,10 @@ def inject_voice(self, new_voice, override=False):
         """ Adding new voice to bar.
         Omitting double or conflicting bar attributes as long as override is false.
         Omitting also bars with only skips."""
+
+        if new_voice.line_break:
+            self.line_break = True
+
         if new_voice.obj_list[0].has_attr():
             if self.obj_list[0].has_attr():
                 self.obj_list[0].merge_attr(new_voice.obj_list[0], override)

tests/test_xml.py

@@ -31,6 +31,9 @@ def test_tuplet():
     compare_output('tuplet')
 
 
+def test_break():
+    compare_output('break')
+
 def ly_to_xml(filename):
     """Read Lilypond file and return XML string."""
     writer = ly.musicxml.writer()

tests/test_xml_files/break.ly

@@ -0,0 +1,8 @@
+\score {
+  \relative c' {
+    c1 | \break
+    c | c | \break
+    c | c | c 1
+  }
+  \layout{}
+}

tests/test_xml_files/break.xml

@@ -0,0 +1,97 @@
+<?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>2017-03-25</encoding-date>
+    </encoding>
+  </identification>
+  <part-list>
+    <score-part id="P1">
+      <part-name />
+    </score-part>
+  </part-list>
+  <part id="P1">
+    <measure number="1">
+      <attributes>
+        <divisions>1</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>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+    <measure number="2">
+      <print new-system="yes" />
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+    <measure number="3">
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+    <measure number="4">
+      <print new-system="yes" />
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+    <measure number="5">
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+    <measure number="6">
+      <note>
+        <pitch>
+          <step>C</step>
+          <octave>4</octave>
+        </pitch>
+        <duration>4</duration>
+        <voice>1</voice>
+        <type>whole</type>
+      </note>
+    </measure>
+  </part>
+</score-partwise>