[WIP] Escaped characters are correctly parsed. They now have to be correctly rendered

[ci skip]

patacrep/songs/chordpro/lexer.py

@@ -30,8 +30,6 @@ tokens = (
     'EE',
 )
 
-literals = [ '{', '}', "\\", ' ' ]
-
 class ChordProLexer:
     """ChordPro Lexer class"""
     # pylint: disable=too-many-public-methods
@@ -51,7 +49,7 @@ class ChordProLexer:
 
     t_directive_SPACE = r'[ \t]+'
     t_directive_KEYWORD = r'[a-zA-Z_]+'
-    t_directiveargument_TEXT = r'[^}]+'
+    t_directiveargument_TEXT = r'[^\\}]+'
 
     @staticmethod
     def t_SOC(token):
@@ -120,7 +118,7 @@ class ChordProLexer:
 
     @staticmethod
     def t_WORD(token):
-        r'[^{}\r\n\]\[\t ]+'
+        r'[^{}\\\r\n\]\[\t ]+'
         return token
 
     def t_LBRACKET(self, __token):
@@ -153,10 +151,18 @@ class ChordProLexer:
         return token
 
     @staticmethod
-    def t_literal(token):
-        r'\[{} \#]'
-        t.type = t.type[1]
-        return t
+    def t_ESCAPED(token):
+        r'\\[{} #\\]'
+        token.value = token.value[1]
+        token.type = "WORD"
+        return token
+
+    @staticmethod
+    def t_directiveargument_ESCAPED(token):
+        r'\\[{} #\\]'
+        token.value = token.value[1]
+        token.type = "TEXT"
+        return token
 
     def error(self, token, more=""):
         """Display error message, and skip illegal token."""

patacrep/songs/chordpro/syntax.py

@@ -182,9 +182,8 @@ class ChordproParser(Parser):
 
     @staticmethod
     def p_directive_next(symbols):
-        """directive_next : SPACE COLON TEXT
-                          | COLON TEXT
-                          | COLON
+        """directive_next : SPACE COLON directive_argument
+                          | COLON directive_argument
                           | empty
         """
         if len(symbols) == 3:
@@ -196,6 +195,16 @@ class ChordproParser(Parser):
         else:
             symbols[0] = None
 
+    @staticmethod
+    def p_directive_argument(symbols):
+        """directive_argument : TEXT directive_argument
+                              | empty
+        """
+        if len(symbols) == 3:
+            symbols[0] = symbols[1] + symbols[2]
+        else:
+            symbols[0] = ""
+
     def p_line_error(self, symbols):
         """line_error : error directive"""
         self.error(

test/test_song/latex.csg

@@ -0,0 +1,10 @@
+{lang: en}
+{title: & $ % # _ \} \{ ~ ^ \\}
+{artist:  & $ % # _ \} \{ ~ ^ \\}
+{album: & $ % # _ \} \{ ~ ^ \\}
+
+& $ % \# _ \} \{ ~ ^ \\
+
+{start_of_chorus}
+    & $ % \# _ \} \{ ~ ^ \\
+{end_of_chorus}