Added support for duplicated semicolons

Author: RobertoRoos

src/plcdoc/st_declaration.tx

@@ -68,7 +68,7 @@ TypeEnum:
     ')'
     (base_type=Fqn)?
     (default=EnumDefault)?
-    ';'
+    SemiColon
 ;
 
 EnumOption:
@@ -89,7 +89,7 @@ TypeAlias:
    base=VariableType
    CommentAny*
    // Catch trailing comments here, not at the end of `Variable`
-   ';'
+   SemiColon
 ;
 
 /*
@@ -106,7 +106,7 @@ Function:
     ('EXTENDS' extends=Fqn)?
     ('IMPLEMENTS' implements=Fqn)?
     (':' return=VariableType (arglist=ArgList)?)?
-    (';')?
+    (SemiColon)?
     lists*=VariableList
 ;
 
@@ -167,7 +167,7 @@ Variable:
     type=VariableType
     (arglist=ArgList)?
     (AssignmentSymbol value=AssignmentValue)?
-    ';'
+    SemiColon
     comment=CommentLine?
 ;
 
@@ -235,6 +235,13 @@ Fqn[noskipws]:
     /\s/*-
 ;
 
+/*
+Semi-colons may be repeated in valid code
+*/
+SemiColon:
+   ';'+
+;
+
 /*
 Anything that is considered a value: a literal, a variable, or e.g. a sum
 */

tests/plc_code/FB_Variables.txt

@@ -54,6 +54,8 @@ myfloat_no_ws:REAL;
     mypointer2          : REFERENCE TO UDINT;
     mypointer3          : REFERENCE TO FB_Motor REF= _motor;
 
+    extra_semicolons    : INT := 7;;;;;;;;;;
+
     timeout1            : TIME := T#2S;
     timeout2            : TIME := T#12m13s14ms;
 

tests/test_st_grammar.py

@@ -80,8 +80,8 @@ def test_grammar_variables(meta_model):
     filepath = os.path.realpath(tests_dir + "/plc_code/" + filename)
     try:
         model = meta_model.model_from_file(filepath)
-    except:
-        pytest.fail(f"Error when analyzing the file `{filename}`")
+    except TextXSyntaxError as err:
+        pytest.fail(f"Error when analyzing the file `{filename}`: {err}")
     else:
         assert model.functions
         fb = model.functions[0]