grammars: nit

Author: ochafik

common/grammar-parser.cpp

@@ -98,7 +98,7 @@ namespace grammar_parser {
             pos++;
         }
         if (pos == src) {
-            throw std::runtime_error(std::string("expecting name at ") + src);
+            throw std::runtime_error(std::string("expecting integer at ") + src);
         }
         return pos;
     }
@@ -159,6 +159,8 @@ namespace grammar_parser {
                 throw std::runtime_error(std::string("expecting preceding item to */+/?/{ at ") + pos);
             }
 
+            // apply transformation to previous symbol (last_sym_start to end) according to
+            // the following rewrite rules:
             // S*     --> S{0,}
             // S+     --> S{1,}
             // S?     --> S{0,1}

grammars/README.md

@@ -64,7 +64,7 @@ Parentheses `()` can be used to group sequences, which allows for embedding alte
 - `?` makes the preceding symbol or sequence optional (equivalent to `{0,1}`).
 - `{m}` repeats the precedent symbol or sequence exactly `m` times
 - `{m,}` repeats the precedent symbol or sequence at least `m` times
-- `{m,n}` repeats the precedent symbol or sequence at betwen `m` and `n` (included) times (included)
+- `{m,n}` repeats the precedent symbol or sequence at betwen `m` and `n` times (included)
 - `{,n}` repeats the precedent symbol or sequence at most `n` times (included)
 
 ## Comments and newlines