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   let name = sprintf "binder_%u" index in
 107   output "template <class T>";
 108   start_struct name;
 109
 110   output "static void of_stmt(sqlite3_stmt* stmt, T& obj)";
 111   open_curly ();
 112   List.iteri (fun index attr -> get_column attr index) scheme;
 113   close_curly "";
 114
 115   output "static void to_stmt(sqlite3_stmt* stmt, const T& obj)";
 116   open_curly ();
 117   List.iteri (fun index attr -> set_column attr (index + 1)) scheme;
 118   close_curly "";
 119   end_struct name;
 120   name
 121
 122 let output_scheme_binder i s = in_namespace "detail" (fun () -> output_scheme_binder i s)
 123
 124 let params_to_values = List.mapi (fun i (n,t) -> param_name_to_string n i, param_type_to_string t)
 125 let make_const_values = List.map (fun (name,t) -> name, sprintf "%s const&" t)
 126
 127 let output_value_defs vals =
 128   vals >> make_const_values >> List.iter (fun (name,t) -> output "%s %s_;" t name)
 129
 130 let output_value_inits vals =
 131   match vals with
 132   | [] -> ()
 133   | _ ->
 134     output " : %s"
 135     (String.concat "," (List.map (fun (name,_) -> sprintf "%s_(%s)" name name) vals))
 136
 137 let output_params_binder index params =
 138   out_private ();
 139   let name = default_name "params_binder" index in
 140   start_struct name;
 141   let values = params_to_values params in
 142   output_value_defs values;
 143   empty_line ();
 144   output "%s(%s)" name (Cpp.to_string (make_const_values values));
 145   output_value_inits values;
 146   open_curly ();
 147   close_curly "";
 148   empty_line ();
 149   output "void set_params(sqlite3_stmt* stmt)";
 150   open_curly ();
 151   List.iteri set_param params;
 152   close_curly "";
 153   empty_line ();
 154   end_struct name;
 155   name
 156
 157 let output_params_binder index params =
 158   match params with
 159   | [] -> "typename Traits::no_params"
 160   | _ -> output_params_binder index params
 161
 162 let generate_select_code index scheme params props =
 163    let scheme_binder_name = output_scheme_binder index scheme in
 164    let params_binder_name = output_params_binder index params in
 165    out_public ();
 166    output "template<class T>";
 167    let values = params_to_values params in
 168    let all_params = Cpp.to_string
 169      (["sqlite3*","db"; "T&","result"] @ (make_const_values values))
 170    in
 171    let name = make_name props (default_name "select" index) in
 172    let sql = Props.get props "sql" >> Option.get >> Cpp.quote in
 173    output "static bool %s(%s)" name all_params;
 174    open_curly ();
 175    output "return Traits::do_select(db,result,_T(\"%s\"),%s(),%s(%s));"
 176           sql scheme_binder_name params_binder_name (Cpp.inline (make_const_values values));
 177    close_curly "";
 178    empty_line ()
 179
 180 (*
 181 let generate_insert_code columns table index (placeholders,props) sql =
 182       out_public ();
 183       let name = make_name props (default_name table "insert" index) in
 184       output (sprintf "static bool %s(sqlite3* db, const %s& val)" name (item_name table));
 185       open_curly ();
 186       output (sprintf "return Traits::do_insert<binder_%s>(db,val,_T(\"%s\"));" (item_name table) sql);
 187       close_curly "";
 188       output ""
 189   *)
 190
 191 (*
 192 let generate_modify_code table cols inputs index props sql =
 193   (* if there is only one input column - do not require full object as a param *)
 194   let (cols,inputs) = match cols with
 195   | [(x,_)] -> [],(x.Sql.Col.name,x.Sql.Col.sqltype)::inputs
 196   | _ -> cols,inputs
 197   in
 198   let params_binder_name = output_params_binder index table cols inputs in
 199   out_public ();
 200   let data_params = make_const_params inputs in
 201   let data_params = (match cols with
 202     | [] -> data_params
 203     | _ -> ((sprintf "const %s&" (item_name table)),"val")::data_params)
 204   in
 205   let params = Cpp.Params.to_string (("sqlite3*","db") :: data_params) in
 206   let name = make_name props (default_name table "modify" index) in
 207   output (sprintf "static int %s(%s)" name params);
 208   open_curly ();
 209   output (sprintf "return Traits::do_execute(db,\"%s\",%s(%s));" sql
 210       params_binder_name (Cpp.inline data_params));
 211   close_curly "";
 212   output ""
 213
 214 let generate_delete_code table inputs index props sql =
 215   let params_binder_name = output_params_binder index table [] inputs in
 216   out_public ();
 217   let data_params = make_const_params inputs in
 218   let params = Cpp.Params.to_string (("sqlite3*","db") :: data_params) in
 219   let name = make_name props (default_name table "delete" index) in
 220   output (sprintf "static int %s(%s)" name params);
 221   open_curly ();
 222   output (sprintf "return Traits::do_execute(db,\"%s\",%s(%s));" sql
 223       params_binder_name (Cpp.Params.inline data_params));
 224   close_curly "";
 225   output ""
 226
 227 let generate_create_code table sql =
 228   out_public ();
 229   output (sprintf "static int %screate(sqlite3* db)" (prefix_name table));
 230   open_curly ();
 231   output (sprintf "return Traits::do_execute(db,\"%s\",typename Traits::no_params());" sql);
 232   close_curly "";
 233   output ""
 234 *)
 235
 236 let generate_code index stmt =
 237   let ((scheme,params),props) = stmt in
 238   begin match Props.get props "sql" with
 239   | Some s -> comment "%s" s
 240   | None -> ()
 241   end;
 242   generate_select_code index scheme params props
 243
 244 let process stmts =
 245 (*
 246   let generate_code index stmt =
 247     let (kind,table,props,sql) = stmt in
 248     match kind with
 249     | Stmt.Create -> generate_table_code table;
 250                      generate_create_code table sql
 251     | Stmt.Select (outputs,exprs,inputs) ->
 252         generate_select_code table inputs outputs index props sql
 253     | Stmt.Modify (cols,inputs) -> generate_modify_code table cols inputs index props sql
 254     | Stmt.Delete (inputs) -> generate_delete_code table inputs index props sql
 255   in
 256 *)
 257   generate_header ();
 258   output "namespace sql2cpp";
 259   open_curly ();
 260   List.iteri generate_code stmts;
 261   close_curly " // namespace sql2cpp"