lib/ast.ml

@@ -69,8 +69,6 @@ and expression_primary =
   | DateLiteral of string
   | TimeLiteral of string
   | TimestampLiteral of string
-  | IntegerLiteral of int
-  | FloatLiteral of float
   | Concatenation of expression_primary * expression_primary
   | Numeric of expression_primary * sign * expression_primary
   | Signed of sign * expression_primary
@@ -105,18 +103,8 @@ and pp_expression exp =
   | DateLiteral(d) -> "'" ^ d ^ "'"
   | TimeLiteral(t) -> "'" ^ t ^ "'"
   | TimestampLiteral(ts) -> "'" ^ ts ^ "'" 
-  | IntegerLiteral(i) -> string_of_int i
-  | FloatLiteral(f) -> string_of_float f
-  | Numeric(n1, s, n2) -> pp_expression n1 ^ pp_sign s ^ pp_expression n2
   | _ -> "Expression not yet supported"
 
-and pp_sign sign =
-  match sign with 
-  | Plus -> "+"
-  | Minus -> "-"
-  | Times -> "*"
-  | Divide -> "/"
-
 and pp_table_expression table_exp =
   match table_exp with
   | TableExpression(tables, filter, _) -> pp_tables tables ^ pp_filter filter

parser/parser.mly

@@ -24,7 +24,7 @@ open Ast
 %token DATE TIME TIMESTAMP
 %token <int> INTEGER 
 %token <float> FLOAT
-%token QUOTE COLON
+%token UNDERSCORE QUOTE COLON
 %token EOF
 %start main
 %type <query> main
@@ -61,7 +61,7 @@ literal :
   | general_literal { $1 }
 
 unsigned_literal:
-  | unsigned_numeric_literal { $1 }
+(*  | unsigned_numeric_literal { $1 }*)
   | general_literal { $1 }
 
 general_literal:
@@ -71,17 +71,19 @@ general_literal:
 character_string_literal:
   | QUOTE IDENT QUOTE { StringLiteral($2) }
 
+introducer:
+  | UNDERSCORE { }
 
 signed_numeric_literal:
-  | sign unsigned_numeric_literal { Signed($1,$2) }
-  | unsigned_numeric_literal { $1 }
+  | sign unsigned_numeric_literal {}
+  | unsigned_numeric_literal {}
 
 unsigned_numeric_literal :
   | exact_numeric_literal { $1 }
 
 exact_numeric_literal:
-  | FLOAT { FloatLiteral($1) }
-  | INTEGER { IntegerLiteral($1) }
+  | FLOAT { }
+  | INTEGER {}
 
 sign:
   | PLUS_SIGN { Plus }
@@ -188,6 +190,10 @@ nonparenthesized_value_expression_primary:
 
 unsigned_value_specification:
   | unsigned_literal { $1 }
+  (*| general_value_specification {}*)
+
+general_value_specification:
+  | {}
 
 (*********************************************)
 

test/test_ast.ml

@@ -58,7 +58,7 @@ let test_simple_select () =
   in
   Alcotest.(check query_testable) query q2 ast2 ;
 
-  let query = "SELECT 1+1, 1, 'b', 'a', DATE '2024-12-25' AS date" in
+  let query = "SELECT 'b', 'a', DATE '2024-12-25' AS date" in
   let q3 = parse query in
   let ast3 =
     Select(
@@ -76,18 +76,6 @@ let test_simple_select () =
         Column(
           StringLiteral("b"),
           None
-        );
-        Column(
-          IntegerLiteral(1),
-          None
-        );
-        Column(
-          Numeric(
-            IntegerLiteral(1),
-            Plus,
-            IntegerLiteral(1)
-          ),
-          None
         )
       ],
       TableExpression(