support C style // to-end-of-line comments, see #17

Author: ThomasWaldmann

demo.S

@@ -3,7 +3,7 @@
             .text
 
 textstart:  ld r0, r1, 0    # a comment!
-            st r0, r1, 0
+            st r0, r1, 0    // another comment!
             add r0, r1, r2
             add r0, r1, 42
             sub r0, r1, r2

esp32_ulp/assemble.py

@@ -22,7 +22,9 @@ def parse_line(self, line):
 
         label:    opcode arg1, arg2, ...    # rest-of-line comment
         """
-        line = line.split('#', 1)[0].rstrip()
+        line = line.split('#', 1)[0]
+        line = line.split('//', 1)[0]
+        line = line.rstrip()
         if not line:
             return
         has_label = line[0] not in '\t '

tests/assemble.py

@@ -9,7 +9,7 @@
         ld r0, r1, 0
         st  r0,  r1,0    # line 7
         halt
-end:
+end:    // C style comment
 """