src/gen.ml

   1 (* Code generation *)
   2
   3 open Printf
   4 open ExtLib
   5 open Prelude
   6 open Stmt
   7
   8 type subst_mode = | Named | Unnamed | Oracle | PostgreSQL
   9
  10 (** defines substitution function for parameter literals *)
  11 let params_mode = ref None
  12
  13 let (inc_indent,dec_indent,make_indent) =
  14   let v = ref 0 in
  15   (fun () -> v := !v + 2),
  16   (fun () -> v := !v - 2),
  17   (fun () -> String.make !v ' ')
  18
  19 let print_indent () = print_string (make_indent ())
  20 let indent s = print_indent (); print_string s
  21 let indent_endline s = print_indent (); print_endline s
  22 let output fmt = kprintf indent_endline fmt
  23 let output_l = List.iter indent_endline
  24 let print fmt = kprintf print_endline fmt
  25 let indented k = inc_indent (); k (); dec_indent ()
  26
  27 let name_of attr index =
  28   match attr.Sql.name with
  29   | "" -> sprintf "_%u" index
  30   | s -> s
  31
  32 let param_name_to_string ((name,_):Sql.param_id) index =
  33   match name with
  34   | None -> sprintf "_%u" index
  35   | Some s -> s
  36
  37 let make_name props default = Option.default default (Props.get props "name")
  38 let default_name str index = sprintf "%s_%u" str index
  39
  40 let choose_name props kind index =
  41   let fix = String.map begin function
  42   | ('a'..'z' | 'A'..'Z' | '0'..'9' | '_' as c) -> c
  43   | _ -> '_'
  44   end in
  45   let fix s =
  46     match Props.get props "subst" with
  47     | Some x -> let (_,s) = String.replace ~str:s ~sub:("%%"^x^"%%") ~by:x in fix s
  48     | None -> fix s
  49   in
  50   let name = match kind with
  51   | Create t -> sprintf "create_%s" (fix t)
  52   | CreateIndex t -> sprintf "create_index_%s" (fix t)
  53   | Update (Some t) -> sprintf "update_%s_%u" (fix t) index
  54   | Update None -> sprintf "update_%u" index
  55   | Insert (_,t) -> sprintf "insert_%s_%u" (fix t) index
  56   | Delete t -> sprintf "delete_%s_%u" (fix t) index
  57   | Alter t -> sprintf "alter_%s_%u" (fix t) index
  58   | Drop t -> sprintf "drop_%s" (fix t)
  59   | Select _  -> sprintf "select_%u" index
  60   | Other -> sprintf "statement_%u" index
  61   in
  62   make_name props name
  63
  64 let substitute_params s params f =
  65   let index = ref 0 in
  66   let b = Buffer.create (String.length s) in
  67   let last = List.fold_left (fun i ((_,(i1,i2)),_ as param) ->
  68     let prefix = String.slice ~first:i ~last:i1 s in
  69     Buffer.add_string b prefix;
  70     Buffer.add_string b (f !index param);
  71     incr index;
  72     i2) 0 params in
  73   Buffer.add_string b (String.slice ~first:last s);
  74   Buffer.contents b
  75
  76 let subst_named index (id,_) = "@" ^ (param_name_to_string id index)
  77 let subst_oracle index (id,_) = ":" ^ (param_name_to_string id index)
  78 let subst_postgresql index _ = "$" ^ string_of_int (index + 1)
  79 let subst_unnamed _ _ = "?"
  80
  81 let get_sql stmt =
  82   let sql = Props.get stmt.props "sql" |> Option.get in
  83   match !params_mode with
  84   | None -> sql
  85   | Some subst ->
  86     let f = match subst with
  87     | Named -> subst_named
  88     | Unnamed -> subst_unnamed
  89     | Oracle -> subst_oracle
  90     | PostgreSQL -> subst_postgresql
  91     in
  92     substitute_params sql stmt.params f
  93
  94 let time_string () =
  95   let module U = Unix in
  96   let t = U.time () |> U.gmtime in
  97   sprintf "%04u-%02u-%02uT%02u:%02uZ" (1900 + t.U.tm_year) (t.U.tm_mon+1) t.U.tm_mday t.U.tm_hour t.U.tm_min
  98
  99 module type LangTypes = sig
 100
 101 val as_api_type : Sql.Type.t -> string
 102 val as_lang_type : Sql.Type.t -> string
 103
 104 end
 105
 106 module Translate(T : LangTypes) = struct
 107
 108 let param_type_to_string = T.as_api_type
 109 let schema_to_values = List.mapi (fun i attr -> name_of attr i, T.as_lang_type attr.Sql.domain)
 110 (* let schema_to_string = G.Values.to_string $ schema_to_values  *)
 111 let all_params_to_values = List.mapi (fun i (n,t) -> param_name_to_string n i, T.as_lang_type t)
 112 (* rev unique rev -- to preserve ordering with respect to first occurrences *)
 113 let params_to_values = List.rev $ List.unique ~cmp:(=) $ List.rev $ all_params_to_values
 114
 115 end
 116
 117 module type Generator = sig
 118   type t
 119   val generate : t -> string -> Stmt.t Enum.t -> unit
 120   val start : unit -> t
 121   val comment : t -> ('a,unit,string,unit) format4 -> 'a
 122   val empty_line : t -> unit
 123 end
 124
 125 module Make(S : Generator) = struct
 126
 127 let generate_header out =
 128   S.comment out "DO NOT EDIT MANUALLY";
 129   S.comment out "";
 130   S.comment out "generated by sqlgg %s on %s" Sqlgg_config.version (time_string ());
 131   S.empty_line out
 132
 133 let process name stmts =
 134   let out = S.start () in
 135   if !Sqlgg_config.gen_header then generate_header out;
 136   S.generate out name stmts
 137
 138 end