Fix error with multiline colon in ASM

zxbasm allows multiple instructions per line using colon (':').
The sequence ld e, a: ld e, 0 (for example) was not being parsed correctly.
Fixed.

Author: boriel

asmlex.py

@@ -245,12 +245,16 @@ def t_INITIAL_preproc_INTEGER(self, t):
 
     def t_INITIAL_ID(self, t):
         r'[._a-zA-Z][._a-zA-Z0-9]*([ \t]*[:])?'  # Any identifier
-
         tmp = t.value  # Saves original value
         if tmp[-1] == ':':
-            t.type = 'LABEL'
-            t.value = tmp[:-1].strip()
-            return t
+            c = self.find_column(t)
+            if not self.input_data[t.lexpos - c + 1: t.lexpos].strip():
+                t.type = 'LABEL'
+                t.value = tmp[:-1].strip()
+                return t
+
+            tmp = t.value = t.value[:-1].strip()  # remove the colon ':'
+            t.lexer.lexpos -= 1
 
         t.value = tmp.upper()  # Convert it to uppercase, since our internal tables uses uppercase
         id_ = tmp.lower()

tests/functional/asmcolon2.asm

@@ -0,0 +1 @@
+ld e,a : ld d,0