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+location: 
+    | LOCATION_START EOL*
+      line_statement*
+      LOCATION_END EOL*
+      EOF 
+
+line_statement:
+    | COMMENT EOL+              // A comment
+    | COLUMN IDENT EOL*         // A location
+    | instruction, line_sep     
+    | inline_action  line_sep
+    | ACT expression COLUMN EOL+ // ACT … END ACT
+      line_statement*
+      END ACT?                  // Yes you can have END or END ACT
+      line_sep
+    | IF expression COLUMN EOL+ // IF … END IF
+      line_statement*
+      elif*
+      else
+      END IF?                   // Yes you can have END or END IF
+      line_sep
+
+elif:
+    | ELIF
+      expression COLUMN EOL+
+      line_statement*
+
+else:
+    | ELSE EOL+
+      line_statement*
+    |
+
+line_sep:
+    | EOL+
+    | AMPERSAND+ EOL*
+
+
+instruction:
+    | expression
+    | let_assignation
+    | keyword argument(expression)
+
+keyword:
+    | STAR KEYWORD              // A keyword starting with *
+    | KEYWORD
+
+let_assignation:
+    | assignation
+      variable
+      assignation_operator
+      expression 
+
+assignation: 
+    |
+    | LET 
+    | SET
+
+assignation_operator:
+    | EQUAL
+    | INCR                      // +=
+    | DECR                      // -=
+
+inline_action:
+    | ACT expression COLUMN     // There is a recursive code here
+    | IF expression COLUMN      // Because ACT: can contains an IF: etc
+      (ELSE, instruction)?      // complicated to flatten here.
+
+expression:
+    | delimited(l_paren, expression, r_paren) 
+    | unary_operator expression 
+    | expression binary_operator expression 
+    | literal  
+    | integer 
+    | variable
+    | function argument(expression)
+
+unary_operator:
+    | OBJ
+    | LOC
+    | NO
+    | MINUS
+    | PLUS
+
+binary_operator:
+    | EQUAL
+    | LT GT                 // Different
+    | EXCLAMATION           // Neg, not a comment here
+    | PLUS
+    | MINUS
+    | STAR                  // Not the first char of keyword here
+    | DIV
+    | MOD
+    | GT
+    | LT
+    | GT EQUAL
+    | LT EQUAL
+    | EQUAL GT              // Alternative syntax
+    | EQUAL LT              // Alternative syntax
+    | AND
+    | OR