[song.chordpro] Catch fatal syntax error when a block is not closed

patacrep/songs/__init__.py

@@ -7,8 +7,10 @@ import os
 import pickle
 import re
 
+from patacrep import errors as book_errors
 from patacrep import files, encoding
 from patacrep.authors import process_listauthors
+from patacrep.songs import errors as song_errors
 
 LOGGER = logging.getLogger(__name__)
 
@@ -106,7 +108,7 @@ class Song:
         self.subpath = subpath
         self._filehash = None
         self.encoding = config["encoding"]
-        self.default_lang = config["lang"]
+        self.lang = config["lang"]
         self.config = config
         self.errors = []
 
@@ -116,8 +118,7 @@ class Song:
         # Data extraction from the latex song
         self.titles = []
         self.data = {}
-        self.cached = None
-        self.lang = None
+        self.cached = {}
         self._parse()
 
         # Post processing of data

patacrep/songs/chordpro/__init__.py

@@ -31,7 +31,7 @@ class ChordproSong(Song):
             song = parse_song(song.read(), self.fullpath)
         self.authors = song.authors
         self.titles = song.titles
-        self.lang = song.get_data_argument('language', self.default_lang)
+        self.lang = song.get_data_argument('language', self.lang)
         self.data = song.meta
         self.errors = [error(song=self) for error in song.error_builders]
         self.cached = {

patacrep/songs/chordpro/syntax.py

@@ -1,13 +1,14 @@
 """ChordPro parser"""
 
+import functools
 import logging
 import ply.yacc as yacc
 import re
 
-from patacrep.songs.syntax import Parser
+from patacrep.songs import errors
 from patacrep.songs.chordpro import ast
 from patacrep.songs.chordpro.lexer import tokens, ChordProLexer
-from patacrep.songs import errors
+from patacrep.songs.syntax import Parser
 
 LOGGER = logging.getLogger()
 
@@ -328,19 +329,13 @@ def parse_song(content, filename=None):
         lexer=ChordProLexer(filename=filename).lexer,
         )
     if parsed_content is None:
-        # pylint: disable=fixme
-        # TODO: Provide a nicer error (an empty song?)
-        # TODO: Add an error to the song.errors list.
-        #       using parser._errors
-
-        # pylint: disable=protected-access
-        if parser._errors:
-            # The line where it started to go wrong
-            lineno = parser._errors[-1].line
-        else:
-            lineno = None
-        raise errors.SongSyntaxError(
-            message='Fatal error during song parsing: {}'.format(filename),
-            line=lineno,
+        return ast.Song(
+            filename,
+            [],
+            errors=[functools.partial(
+                errors.SongSyntaxError,
+                line=parser._errors[-1].keywords['line'],
+                message='Fatal error during song parsing.',
+                )]
             )
     return parsed_content