Add converter.toData, improve braille docs

music21/base.py

@@ -2820,11 +2820,12 @@ def write(
             raise Music21ObjectException(f'cannot support output in this format yet: {fmt}')
         formatWriter = scClass()
         return formatWriter.write(self,
-                                  regularizedConverterFormat,
+                                  fmt=regularizedConverterFormat,
                                   fp=fp,
                                   subformats=subformats,
                                   **keywords)
 
+
     def _reprText(self, **keywords):
         '''
         Return a text representation possible with line
@@ -2873,7 +2874,7 @@ def show(self, fmt=None, app=None, **keywords):  # pragma: no cover
             if common.runningUnderIPython():
                 try:
                     fmt = environLocal['ipythonShowFormat']
-                except environment.EnvironmentException:
+                except (environment.EnvironmentException, KeyError):
                     fmt = 'ipython.musicxml.png'
             else:
                 fmt = environLocal['showFormat']

music21/braille/basic.py

@@ -9,6 +9,35 @@
 # Copyright:    Copyright © 2011-22 Michael Scott Asato Cuthbert
 # License:      BSD, see license.txt
 # ------------------------------------------------------------------------------
+r'''
+Basic tools for working with Braille in `music21`.  Most users will not need to
+use these.  Simply call `.show('braille')` or `.show('braille.ascii')`
+
+>>> soprano = corpus.parse('bwv66.6').parts[0]
+>>> #_DOCS_SHOW soprano.show('braille.ascii')
+>>> print(converter.toData(soprano, 'braille.ascii'))  # _DOCS_HIDE
+                     %%%.C
+    #J .DJ [W?<L$ ?W[<L? IJ\]<L[ WW]$ [W?<L?
+      "[W?[ \]R<L Q]]@C ]G%F]<L<K
+
+Normally this would open up in a new window.  But to store the data, use
+`converter.toData(..., 'braille')`.  Here we show this in Unicode braille
+(the default for format braille)
+
+>>> data = converter.toData(soprano, 'braille')
+>>> print(data)
+    ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠩⠩⠩⠨⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
+    ⠼⠚⠀⠨⠙⠚⠀⠪⠺⠹⠣⠇⠫⠀⠹⠺⠪⠣⠇⠹⠀⠊⠚⠳⠻⠣⠇⠪⠀⠺⠺⠻⠫⠀⠪⠺⠹⠣⠇⠹
+    ⠀⠀⠐⠪⠺⠹⠪⠀⠳⠻⠗⠣⠇⠀⠟⠻⠻⠈⠉⠀⠻⠛⠩⠋⠻⠣⠇⠣⠅
+
+Any :class:`~music21.base.Music21Object` which cannot be transcribed in
+:mod:`~music21.braille.basic` returns a braille literary question mark
+and outputs a warning to the console, rather than raising an exception.
+This is so that a transcription of a :class:`~music21.stream.Stream` in
+:class:`~music21.braille.translate` is completed as thoroughly as possible.
+'''
+
+
 from __future__ import annotations
 
 import typing as t
@@ -52,15 +81,6 @@
 # ------------------------------------------------------------------------------
 # music21Object to braille unicode methods
 
-# noinspection PyStatementEffect
-'''
-Any :class:`~music21.base.Music21Object` which cannot be transcribed in
-:mod:`~music21.braille.basic` returns a braille literary question mark
-and outputs a warning to the console, rather than raising an exception.
-This is so that a transcription of a :class:`~music21.stream.Stream` in
-:class:`~music21.braille.translate` is completed as thoroughly as possible.
-'''
-
 def barlineToBraille(music21Barline):
     r'''
     Takes in a :class:`~music21.bar.Barline` and returns its representation
@@ -1449,18 +1469,16 @@ def brailleUnicodeToBrailleAscii(brailleUnicode):
     translates a braille UTF-8 unicode string into braille ASCII,
     which is the format compatible with most braille embossers.
 
-
     .. note:: The function works by corresponding braille symbols to ASCII symbols.
         The table which corresponds to said values can be found
         `here <https://en.wikipedia.org/wiki/Braille_ASCII#Braille_ASCII_values>`_.
         Because of the way in which the braille symbols translate, the resulting
         ASCII string will look to a non-reader as gibberish. Also, the eighth-note notes
-        in braille
-        music are one-off their corresponding letters in both ASCII and written braille.
+        in braille music are one-off their corresponding letters
+        in both ASCII and written braille.
         The written D is really a C eighth-note, the written E is really a
         D eighth note, etc.
 
-
     >>> from music21.braille.basic import brailleUnicodeToBrailleAscii, noteToBraille
     >>> brailleUnicodeToBrailleAscii('\u2800')
     ' '
@@ -1621,6 +1639,9 @@ def add_letter(inner_letter: str):
                 add_letter(letter.lower())
             elif letter == '.':
                 wordTrans.append(symbols['dot'])
+            elif letter == 'ß':
+                add_letter('s')
+                add_letter('s')
             else:
                 try:
                     add_letter(letter)
@@ -1646,6 +1667,9 @@ def add_letter(inner_letter: str):
                 add_letter(letter.lower())
             elif letter.isdigit():
                 wordTrans.append(lookup.numbersUpper[int(letter)])
+            elif letter == 'ß':
+                add_letter('s')
+                add_letter('s')
             else:
                 add_letter(letter)
 

music21/braille/lookup.py

@@ -346,7 +346,7 @@ def makePitchNameToNotes():
     ']': _B[2356] + _B[3],
     '*': _B[35] + _B[35],
 }
-alphabet.update({str(k): v for k, v in numbersUpper.items()})
+alphabet |= {str(k): v for k, v in numbersUpper.items()}
 
 chordSymbols = {
     'plus': _B[346],

music21/braille/translate.py

@@ -463,22 +463,37 @@ def process_unmatched_part_staff_as_single_part():
     return '\n'.join(allBrailleLines)
 
 
-def metadataToString(music21Metadata, returnBrailleUnicode=False):
+def metadataToString(music21Metadata: metadata.Metadata, returnBrailleUnicode=False) -> str:
     '''
+    Convert a Metadata format to a format for BRF.
+
     >>> from music21.braille import translate
     >>> corelli = corpus.parse('monteverdi/madrigal.3.1.rntxt')
     >>> mdObject = corelli.getElementsByClass(metadata.Metadata).first()
     >>> mdObject.__class__
     <class 'music21.metadata.Metadata'>
+
+    The default is very close to ascii.
+
     >>> print(translate.metadataToString(mdObject))
     Alternative Title: 3.1
     Composer: Claudio Monteverdi
     Title: La Giovinetta Pianta
 
-    >>> print(translate.metadataToString(mdObject, returnBrailleUnicode=True))
+    And in Braille Unicode.
+
+    >>> unicodeVersion = translate.metadataToString(mdObject, returnBrailleUnicode=True)
+    >>> print(unicodeVersion)
     ⠠⠁⠇⠞⠑⠗⠝⠁⠞⠊⠧⠑⠀⠠⠞⠊⠞⠇⠑⠒⠀⠼⠉⠲⠁
     ⠠⠉⠕⠍⠏⠕⠎⠑⠗⠒⠀⠠⠉⠇⠁⠥⠙⠊⠕⠀⠠⠍⠕⠝⠞⠑⠧⠑⠗⠙⠊
     ⠠⠞⠊⠞⠇⠑⠒⠀⠠⠇⠁⠀⠠⠛⠊⠕⠧⠊⠝⠑⠞⠞⠁⠀⠠⠏⠊⠁⠝⠞⠁
+
+    Note the difference between the first and then translating back to ASCII Braille:
+
+    >>> print(braille.basic.brailleUnicodeToBrailleAscii(unicodeVersion))
+    ,ALTERNATIVE ,TITLE3 #C4A
+    ,COMPOSER3 ,CLAUDIO ,MONTEVERDI
+    ,TITLE3 ,LA ,GIOVINETTA ,PIANTA
     '''
     allBrailleLines = []
     for uniqueName, value in music21Metadata.all(returnPrimitives=True, returnSorted=False):

music21/common/stringTools.py

@@ -300,8 +300,13 @@ def stripAccents(inputString: str) -> str:
     True
     >>> common.stripAccents(s)
     'tres vite'
+
+    Also handles the German Eszett
+
+    >>> common.stripAccents('Muß')
+    'Muss'
     '''
-    nfkd_form = unicodedata.normalize('NFKD', inputString)
+    nfkd_form = unicodedata.normalize('NFKD', inputString).replace('ß', 'ss')
     return ''.join([c for c in nfkd_form if not unicodedata.combining(c)])
 
 

music21/converter/__init__.py

@@ -63,6 +63,10 @@
 from music21.metadata import bundles
 
 
+if t.TYPE_CHECKING:
+    from music21 import base
+
+
 __all__ = [
     'subConverters', 'ArchiveManagerException', 'PickleFilterException',
     'ConverterException', 'ConverterFileException',
@@ -1316,6 +1320,41 @@ def parse(value: bundles.MetadataEntry | bytes | str | pathlib.Path,
         # all else, including MidiBytes
         return parseData(value, number=number, format=format, **keywords)
 
+def toData(obj: base.Music21Object, fmt: str, **keywords) -> str | bytes:
+    '''
+    Convert `obj` to the given format `fmt` and return the information retrieved.
+
+    Currently, this is somewhat inefficient: it calls Subconverter.toData which
+    calls `write()` on the object and reads back the value of the file.
+
+    >>> tiny = converter.parse('tinyNotation: 4/4 C4 D E F G1')
+    >>> data = converter.toData(tiny, 'braille.ascii')
+    >>> type(data)
+    <class 'str'>
+    >>> print(data)
+        #D4
+    #A _?:$] (<K
+    '''
+    if fmt.startswith('.'):
+        fmt = fmt[1:]
+    regularizedConverterFormat, unused_ext = common.findFormat(fmt)
+    if regularizedConverterFormat is None:
+        raise ConverterException(f'cannot support output in this format yet: {fmt}')
+
+    formatSubs = fmt.split('.')
+    fmt = formatSubs[0]
+    subformats = formatSubs[1:]
+
+    scClass = common.findSubConverterForFormat(regularizedConverterFormat)
+    if scClass is None:  # pragma: no cover
+        raise ConverterException(f'cannot support output in this format yet: {fmt}')
+    formatWriter = scClass()
+    return formatWriter.toData(
+        obj,
+        fmt=regularizedConverterFormat,
+        subformats=subformats,
+        **keywords)
+
 
 def freeze(streamObj, fmt=None, fp=None, fastButUnsafe=False, zipType='zlib') -> pathlib.Path:
     # noinspection PyShadowingNames

music21/converter/subConverters.py

@@ -329,6 +329,31 @@ def writeDataStream(self,
             fp.close()
             return pathlib.Path('')
 
+    def toData(
+        self,
+        obj,
+        fmt: str | None,
+        subformats: Iterable[str] = (),
+        **keywords,
+    ) -> str | bytes:
+        '''
+        Write the object out in the given format and then read it back in
+        and return the object (str or bytes) returned.
+        '''
+        fp = self.write(obj, fmt=fmt, subformats=subformats, **keywords)
+        if self.readBinary is False:
+            readFlags = 'r'
+        else:
+            readFlags = 'rb'
+        with open(fp,
+                  mode=readFlags,
+                  encoding=self.stringEncoding if self.codecWrite else None
+                  ) as f:
+            out = f.read()
+        fp.unlink(missing_ok=True)
+        return out
+
+
 class ConverterIPython(SubConverter):
     '''
     Meta-subconverter for displaying image data in a Notebook
@@ -547,18 +572,32 @@ class ConverterBraille(SubConverter):
     registerOutputExtensions = ('txt',)
     codecWrite = True
 
-    def show(self, obj, fmt, app=None, subformats=(), **keywords):  # pragma: no cover
+    def show(
+        self,
+        obj,
+        fmt,
+        app=None,
+        subformats=(),
+        **keywords
+    ):  # pragma: no cover
         if not common.runningUnderIPython():
             super().show(obj, fmt, app=None, subformats=subformats, **keywords)
         else:
             from music21 import braille
             dataStr = braille.translate.objectToBraille(obj)
             print(dataStr)
 
-    def write(self, obj, fmt, fp=None, subformats=(), **keywords):  # pragma: no cover
+    def write(
+        self,
+        obj,
+        fmt,
+        fp=None,
+        subformats=(),
+        **keywords
+    ):  # pragma: no cover
         from music21 import braille
         dataStr = braille.translate.objectToBraille(obj, **keywords)
-        if subformats is not None and 'ascii' in subformats:
+        if 'ascii' in subformats:
             dataStr = braille.basic.brailleUnicodeToBrailleAscii(dataStr)
         fp = self.writeDataStream(fp, dataStr)
         return fp
@@ -1770,8 +1809,6 @@ def testMultiPageXMlShow1(self):
 
 if __name__ == '__main__':
     import music21
-    # import sys
-    # sys.argv.append('SimpleTextShow')
     music21.mainTest(Test)
     # run command below to test commands that open musescore, etc.
     # music21.mainTest(TestExternal)