gen.ml

   1 (* C++ code generation *)
   2
   3 open Sql
   4 open Printf
   5 open ExtList
   6 open ExtString
   7 open Operators
   8 open Stmt.Raw
   9
  10 module Cpp =
  11 struct
  12   type value = string * string
  13   type t = value list
  14
  15   let to_string x =
  16     String.concat ", " (List.map (fun (n,t) -> t ^ " " ^ n) x)
  17
  18   let inline x =
  19     String.concat ", " (List.map (fun (n,t) -> n) x)
  20
  21   let quote = String.replace_chars (function '\n' -> "\\\n" | c -> String.make 1 c)
  22 end
  23
  24 let (inc_indent,dec_indent,make_indent) =
  25   let v = ref 0 in
  26   (fun () -> v := !v + 2),
  27   (fun () -> v := !v - 2),
  28   (fun () -> String.make !v ' ')
  29
  30 let print_indent () = print_string (make_indent ())
  31 let indent s = print_indent (); print_string s
  32 let indent_endline s = print_indent (); print_endline s
  33 let empty_line () = print_newline ()
  34 let output fmt = Printf.kprintf indent_endline fmt
  35 let print fmt = Printf.kprintf print_endline fmt
  36 let quote_comment_inline = String.replace_chars (function '\n' -> "\n// " | c -> String.make 1 c)
  37 let comment fmt = Printf.kprintf (indent_endline & quote_comment_inline & (^) "// ") fmt
  38 let open_curly () = output "{"; inc_indent ()
  39 let close_curly fmt = dec_indent (); indent "}"; print fmt
  40 let start_struct name =
  41    output "struct %s" name;
  42    open_curly ()
  43 let end_struct name =
  44    close_curly "; // struct %s" name;
  45    empty_line ()
  46 let out_public () = dec_indent(); output "public:"; inc_indent()
  47 let out_private () = dec_indent(); output "private:"; inc_indent()
  48 let in_namespace name f =
  49   output "namespace %s" name;
  50   open_curly ();
  51   let result = f () in
  52   close_curly " // namespace %s" name;
  53   empty_line ();
  54   result
  55
  56 let generate_header () =
  57     output "// DO NOT EDIT MANUALLY";
  58     output "";
  59     output "// generated by sql2cpp";
  60     output "";
  61     output "#pragma once";
  62     output ""
  63
  64 (*
  65 let ns_name table = table.Table.cpp_name
  66 let item_name _ = "row"
  67 let prefix_name _ = ""
  68 *)
  69
  70 let name_of attr index =
  71   match attr.RA.name with
  72   | "" -> sprintf "_%u" index
  73   | s -> s
  74
  75 let set_column attr index =
  76   output "Traits::set_column_%s(stmt, %u, obj.%s);"
  77     (Type.to_string attr.RA.domain)
  78     index
  79     (name_of attr index)
  80
  81 let get_column attr index =
  82   output "Traits::get_column_%s(stmt, %u, obj.%s);"
  83     (Type.to_string attr.RA.domain)
  84     index
  85     (name_of attr (index+1))
  86
  87 let param_type_to_string t = Option.map_default Type.to_string "Any" t
  88
  89 let param_name_to_string id index =
  90   match id with
  91   | Next -> sprintf "_%u" index
  92   | Numbered x -> sprintf "_%u" x
  93   | Named s -> s
  94
  95 let make_name props default = Option.default default (Props.get props "name")
  96 let default_name str index = sprintf "%s_%u" str index
  97
  98 let set_param index param =
  99   let (id,t) = param in
 100   output "Traits::set_param_%s(stmt, obj.%s, %u);"
 101     (param_type_to_string t)
 102     (param_name_to_string id index)
 103     index
 104
 105 let output_scheme_binder index scheme =
 106   out_private ();
 107   let name = default_name "output" index in
 108   output "template <class T>";
 109   start_struct name;
 110
 111   output "static void of_stmt(sqlite3_stmt* stmt, T& obj)";
 112   open_curly ();
 113   List.iteri (fun index attr -> get_column attr index) scheme;
 114   close_curly "";
 115
 116   output "static void to_stmt(sqlite3_stmt* stmt, const T& obj)";
 117   open_curly ();
 118   List.iteri (fun index attr -> set_column attr (index + 1)) scheme;
 119   close_curly "";
 120   end_struct name;
 121   name
 122
 123 let output_scheme_binder index scheme =
 124   match scheme with
 125   | [] -> "typename Traits::no_output"
 126   | _ -> output_scheme_binder index scheme
 127
 128 let params_to_values = List.mapi (fun i (n,t) -> param_name_to_string n i, param_type_to_string t)
 129 let make_const_values = List.map (fun (name,t) -> name, sprintf "%s const&" t)
 130
 131 let output_value_defs vals =
 132   vals >> make_const_values >> List.iter (fun (name,t) -> output "%s %s_;" t name)
 133
 134 let output_value_inits vals =
 135   match vals with
 136   | [] -> ()
 137   | _ ->
 138     output " : %s"
 139     (String.concat "," (List.map (fun (name,_) -> sprintf "%s_(%s)" name name) vals))
 140
 141 let output_params_binder index params =
 142   out_private ();
 143   let name = default_name "params" index in
 144   start_struct name;
 145   let values = params_to_values params in
 146   output_value_defs values;
 147   empty_line ();
 148   output "%s(%s)" name (Cpp.to_string (make_const_values values));
 149   output_value_inits values;
 150   open_curly ();
 151   close_curly "";
 152   empty_line ();
 153   output "void set_params(sqlite3_stmt* stmt)";
 154   open_curly ();
 155   List.iteri set_param params;
 156   close_curly "";
 157   empty_line ();
 158   end_struct name;
 159   name
 160
 161 let output_params_binder index params =
 162   match params with
 163   | [] -> "typename Traits::no_params"
 164   | _ -> output_params_binder index params
 165
 166 let generate_select_code index scheme params props =
 167    let scheme_binder_name = output_scheme_binder index scheme in
 168    let params_binder_name = output_params_binder index params in
 169    out_public ();
 170    output "template<class T>";
 171    let values = params_to_values params in
 172    let all_params = Cpp.to_string
 173      (["db","sqlite3*"; "result","T&"] @ (make_const_values values))
 174    in
 175    let name = make_name props (default_name "select" index) in
 176    let sql = Props.get props "sql" >> Option.get >> Cpp.quote in
 177    output "static bool %s(%s)" name all_params;
 178    open_curly ();
 179    output "return Traits::do_select(db,result,_T(\"%s\"),%s(),%s(%s));"
 180           sql scheme_binder_name params_binder_name (Cpp.inline (make_const_values values));
 181    close_curly "";
 182    empty_line ()
 183
 184 (*
 185 let generate_insert_code columns table index (placeholders,props) sql =
 186       out_public ();
 187       let name = make_name props (default_name table "insert" index) in
 188       output (sprintf "static bool %s(sqlite3* db, const %s& val)" name (item_name table));
 189       open_curly ();
 190       output (sprintf "return Traits::do_insert<binder_%s>(db,val,_T(\"%s\"));" (item_name table) sql);
 191       close_curly "";
 192       output ""
 193   *)
 194
 195 (*
 196 let generate_modify_code table cols inputs index props sql =
 197   (* if there is only one input column - do not require full object as a param *)
 198   let (cols,inputs) = match cols with
 199   | [(x,_)] -> [],(x.Sql.Col.name,x.Sql.Col.sqltype)::inputs
 200   | _ -> cols,inputs
 201   in
 202   let params_binder_name = output_params_binder index table cols inputs in
 203   out_public ();
 204   let data_params = make_const_params inputs in
 205   let data_params = (match cols with
 206     | [] -> data_params
 207     | _ -> ((sprintf "const %s&" (item_name table)),"val")::data_params)
 208   in
 209   let params = Cpp.Params.to_string (("sqlite3*","db") :: data_params) in
 210   let name = make_name props (default_name table "modify" index) in
 211   output (sprintf "static int %s(%s)" name params);
 212   open_curly ();
 213   output (sprintf "return Traits::do_execute(db,\"%s\",%s(%s));" sql
 214       params_binder_name (Cpp.inline data_params));
 215   close_curly "";
 216   output ""
 217
 218 let generate_delete_code table inputs index props sql =
 219   let params_binder_name = output_params_binder index table [] inputs in
 220   out_public ();
 221   let data_params = make_const_params inputs in
 222   let params = Cpp.Params.to_string (("sqlite3*","db") :: data_params) in
 223   let name = make_name props (default_name table "delete" index) in
 224   output (sprintf "static int %s(%s)" name params);
 225   open_curly ();
 226   output (sprintf "return Traits::do_execute(db,\"%s\",%s(%s));" sql
 227       params_binder_name (Cpp.Params.inline data_params));
 228   close_curly "";
 229   output ""
 230
 231 let generate_create_code table sql =
 232   out_public ();
 233   output (sprintf "static int %screate(sqlite3* db)" (prefix_name table));
 234   open_curly ();
 235   output (sprintf "return Traits::do_execute(db,\"%s\",typename Traits::no_params());" sql);
 236   close_curly "";
 237   output ""
 238 *)
 239
 240 let generate_code index stmt =
 241   let ((scheme,params),props) = stmt in
 242   begin match Props.get props "sql" with
 243   | Some s -> comment "%s" s
 244   | None -> ()
 245   end;
 246   generate_select_code index scheme params props
 247
 248 let process stmts =
 249 (*
 250   let generate_code index stmt =
 251     let (kind,table,props,sql) = stmt in
 252     match kind with
 253     | Stmt.Create -> generate_table_code table;
 254                      generate_create_code table sql
 255     | Stmt.Select (outputs,exprs,inputs) ->
 256         generate_select_code table inputs outputs index props sql
 257     | Stmt.Modify (cols,inputs) -> generate_modify_code table cols inputs index props sql
 258     | Stmt.Delete (inputs) -> generate_delete_code table inputs index props sql
 259   in
 260 *)
 261   generate_header ();
 262   output "template <class Traits>";
 263   start_struct "sql2cpp";
 264   List.iteri generate_code stmts;
 265   end_struct "sql2cpp"