package avro-compiler
Schema compiler for Avro
Install
Dune Dependency
Authors
Maintainers
Sources
v0.1.tar.gz
md5=729b33e6f19b3065fe2e3444c0981d73
sha512=671049a5b471323d87bfa7fd85dc4d1a5ba606c035110e2170b292f32d90d37f093ba91eb0234fbf73435c4c6c3a9a7381fb1a4e450101fa10ff5dea1e3e62a8
doc/src/avro-compiler.lib/codegen.ml.html
Source file codegen.ml
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module Sc = Schema let spf = Printf.sprintf let fpf = Format.fprintf let pstr = Format.pp_print_string (* taken from containers' CCFormat.string_lines *) let ptext out s = fpf out "@[<v>"; let i = ref 0 in let n = String.length s in while !i < n do let j = try String.index_from s !i '\n' with Not_found -> n in if !i>0 then fpf out "@,"; pstr out (String.sub s !i (j - !i)); i := j+1; done; fpf out "@]" module Code = struct type t = | Top of string let to_string (l:t list) : string = let pp out l = List.iteri (fun i s -> if i>0 then fpf out "@ @ "; match s with | Top s -> fpf out "@[%a@]" ptext s ) l; in Format.asprintf "@[<v>%a@]@." pp l let s str : t = Top str let sf fmt = Format.kasprintf s fmt end type state = { mutable code: Code.t list; } let push (self:state) c : unit = self.code <- c :: self.code let ppdoc out = function | None -> () | Some d -> fpf out "@ (** %s *)@ " d (** Generate names for unions *) let mk_gen_name () = let i = ref 0 in fun() -> let n= !i in incr i; spf "union_%d" n type lprinter = Format.formatter -> unit let lstr s out = pstr out s let opt_or default = function None -> default | Some x -> x (** Traverse type, in the context of the toplevel declaration of [ty_name]. *) let rec gen_rec ~root ~is_rec ~names_for_self ~ty_name ~read_name ~write_name ~gen_name (self:state) ty : lprinter * lprinter * lprinter = let recurse ?(names_for_self=names_for_self) ty = gen_rec self ty ~names_for_self ~is_rec ~root:false ~ty_name ~read_name ~write_name ~gen_name in (* check if subtype named [name] is the current type *) let is_self name aliases = let matches s = List.mem s names_for_self in if not root && (matches name || (match aliases with Some l-> List.exists matches l | None -> false)) then ( is_rec := true; true ) else ( false ) in match ty with | Sc.Atomic a -> let tydecl, read, write = match a with | Sc.Null -> "unit", "()", "()" | Sc.Bool -> "bool", "Input.read_bool input", "Output.write_bool out self" | Sc.Int32 -> "int", "Input.read_int input", "Output.write_int out self" | Sc.Int64 -> "int64", "Input.read_int64 input", "Output.write_int64 out self" | Sc.Float32 -> "float", "Input.read_float32 input", "Output.write_float32 out self" | Sc.Float64 -> "float", "Input.read_float64 input", "Output.write_float64 out self" | Sc.String | Sc.Bytes -> "string", "Input.read_string input", "Output.write_string out self" in lstr tydecl, lstr read, lstr write | Sc.Record {name; aliases; _} | Sc.Enum {name; aliases; _} when is_self name aliases -> (* recursive case *) lstr ty_name, (fun out -> fpf out "%s input" read_name), (fun out -> fpf out "%s out self" write_name) | Sc.Named name2 when is_self name2 None -> (* recursive case *) lstr ty_name, (fun out -> fpf out "%s input" read_name), (fun out -> fpf out "%s out self" write_name) | Sc.Named name2 -> lstr name2, (fun out -> fpf out "read_%s input" name2), (fun out -> fpf out "write_%s out self" name2) | Sc.Array ty -> let ty_decl, ty_read, ty_write = recurse ty in let ty out = fpf out "@[%t@ array@]" ty_decl and read out = fpf out "(@[<v>@[<2>let readv input =@ %t@] in@ \ Input.read_array readv input@])" ty_read and write out = fpf out "(@[<v>@[<2>let writev out self =@ %t@] in@ \ Output.write_array writev out self@])" ty_write in ty, read, write | Sc.Str_map ty -> let ty_decl, ty_read, ty_write = recurse ty in let ty out = fpf out "@[%t@ Str_map.t@]" ty_decl in let read out = fpf out "(@[<v>let readv input = %t in@ \ Input.read_map readv input@])" ty_read and write out = fpf out "(@[<v>let writev out self = %t in@ Output.write_map writev out self@])" ty_write; in ty, read, write | Sc.Record {fields; name; aliases; doc; namespace=_ } -> if root then ( let names_for_self = name :: opt_or [] aliases in let enc_fields = List.mapi (fun i (field:Sc.record_field) -> let tydecl, read, write = recurse ~names_for_self field.ty in let ty out = if i>0 then fpf out "@ "; fpf out "@[%s: %t@]; " field.name tydecl; ppdoc out field.doc and read out = fpf out "@[<2>let %s =@ %t in@]@ " field.name read and write out = fpf out "(@[let self = self.%s in@ %t@]);@ " field.name write in ty, read, write) fields in let tydecl out = fpf out "{@ "; List.iter (fun (ty,_,_) -> ty out) enc_fields; fpf out "@;<0 -2>}"; ppdoc out doc; and read out = fpf out "(@[<v>"; List.iter (fun (_,r,_) -> r out) enc_fields; fpf out "{ %s }@])" @@ (String.concat ";" @@ List.map (fun f->f.Sc.name) fields); and write out = fpf out "(@[<v>"; List.iter (fun (_,_,w) -> w out) enc_fields; fpf out "@])" in tydecl, read, write ) else ( (* generate a type decl and refer to it *) let ty_name = String.uncapitalize_ascii name in let read_name' = spf "read_%s" name in let write_name' = spf "write_%s" name in gen_top self ty ~gen_name ~ty_name ~read_name:read_name' ~write_name:write_name'; lstr ty_name, (fun out -> fpf out "%s input" read_name'), (fun out -> fpf out "%s out self" write_name') ) | Sc.Union (([Sc.Atomic Sc.Null; a] | [a; Sc.Atomic Sc.Null]) as l) -> (* basically an option *) let nullfirst = match l with | Sc.Atomic Sc.Null :: _ -> true | _ -> false in let adecl, aread, awrite = recurse a in let ty out = fpf out "@[%t@ option@]" adecl and read out = fpf out "(@[let idx = Input.read_int input in@ \ if idx=%d then None@ else Some (@[%t@])@])" (if nullfirst then 0 else 1) aread and write out = fpf out "(@[<hv>match self with@ \ | None -> Output.write_int out %d@ \ | Some self -> Output.write_int out %d; %t@])" (if nullfirst then 0 else 1) (if nullfirst then 1 else 0) awrite in ty, read, write | Sc.Union l -> if root then ( let l = List.map (fun ty -> ty, recurse ty) l in let ty out = fpf out "@ @[<v>@ "; List.iteri (fun i (ty, (decl,_,_)) -> match ty with | Sc.Fixed {name; _} | Sc.Record {name; _} | Sc.Named name | Sc.Enum {name; _} -> fpf out "@[| C_%s of@ %t @]@ " name decl | Sc.Union _ -> failwith "nested union"; | Sc.Atomic _ | Sc.Array _ | Sc.Str_map _ -> fpf out "@[| C_%d of %t @]@" i decl ) l; fpf out "@]"; and read out = fpf out "(@[<v>let idx = Input.read_int input in@ \ match idx with@ "; List.iteri (fun i (ty,(_,read,_)) -> fpf out "| @[%d ->@ " i; match ty with | Sc.Fixed {name; _} | Sc.Record {name; _} | Sc.Named name | Sc.Enum {name; _} -> fpf out "C_%s@ (%t)@]@ " name read | Sc.Union _ -> failwith "nested union"; | Sc.Atomic _ | Sc.Array _ | Sc.Str_map _ -> fpf out "C_%d %t@]@" i read ) l; fpf out "| _ -> failwith \"bad index\""; fpf out "@])"; and write out = fpf out "(@[<v>match self with@ "; List.iteri (fun i (ty,(_,_,w)) -> match ty with | Sc.Fixed {name; _} | Sc.Record {name; _} | Sc.Named name | Sc.Enum {name; _} -> fpf out "| @[C_%s@ self ->@ Output.write_int out %d;@ %t@]@ " name i w | Sc.Atomic _ | Sc.Array _ | Sc.Str_map _ -> fpf out "| @[C_%d -> Output.write_int out %d; %t@]@" i i w | Sc.Union _ -> failwith "nested union"; ) l; fpf out "@])"; in ty, read, write ) else ( let name' = gen_name () in let read_name' = spf "read_%s" name' in let write_name' = spf "write_%s" name' in gen_top self ty ~ty_name:name' ~read_name:read_name' ~write_name:write_name' ~gen_name; let ty out = pstr out name' and read out = fpf out "%s input" read_name' and write out = fpf out "%s out self" write_name' in ty, read, write ) | Sc.Fixed { name=_; size; doc; namespace=_ } -> let ty out = pstr out "string"; ppdoc out doc; and read out = fpf out "Input.read_string_of_len input %d" size and write out = fpf out "Output.write_string_of_len out %d self" size in ty, read, write | Sc.Enum { name; doc; symbols; aliases=_; namespace=_ } -> if root then ( let ty out = fpf out "@ "; List.iter (fun s -> let cname = String.capitalize_ascii s in fpf out "@ | %s" cname) symbols; ppdoc out doc; and read out = fpf out "(@[<v>let idx = Input.read_int input in@ \ match idx with@ "; List.iteri (fun i s -> let cname = String.capitalize_ascii s in fpf out "| %d -> %s@ " i cname) symbols; fpf out "| _ -> failwith \"bad index\""; fpf out "@])" and write out = fpf out "(@[<v>match self with@ "; List.iteri (fun i s -> let cname = String.capitalize_ascii s in fpf out "| %s -> Output.write_int out %d@ " cname i) symbols; fpf out "@])" in ty, read, write ) else ( let ty_name = String.uncapitalize_ascii name in (* declare type *) let read_name' = spf "read_%s" name in let write_name' = spf "write_%s" name in gen_top self ty ~ty_name ~read_name:read_name' ~write_name:write_name' ~gen_name; let ty out = pstr out ty_name and read out = fpf out "%s input" read_name' and write out = fpf out "%s out self" write_name' in ty, read, write ) and gen_top (self:state) ~gen_name ~read_name ~write_name ~ty_name (ty:Schema.t) : unit = let is_rec = ref false in let decl, read, write = gen_rec self ~names_for_self:[] ~is_rec ~gen_name ~read_name ~ty_name ~write_name ~root:true ty in push self (Code.sf "@[<hv2>type %s%s = %t@]" (if !is_rec then "" else "nonrec ") ty_name decl); push self (Code.sf "@[<hv2>let %s%s (input:Input.t) : %s =@ %t@]" (if !is_rec then "rec " else "") read_name ty_name read); push self (Code.sf "@[<hv2>let %s%s (out:Output.t) (self:%s) : unit =@ %t@]" (if !is_rec then "rec " else "") write_name ty_name write); () let gen ?(internal=false) (sc:Schema.t) : Code.t list = let self = { code=[]; } in push self (Code.sf "(* generated by OCaml-avro schema compiler *)@."); if not internal then push self (Code.sf "open Avro@."); push self (Code.sf "module Str_map = Map.Make(String)@."); push self (Code.sf "let schema = %S@." @@ Schema.to_string sc); let gen_name = mk_gen_name() in gen_top self ~gen_name ~ty_name:"t" ~read_name:"read" ~write_name:"write" sc; List.rev self.code
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