Initial commit

Author: jnfoster

LICENSE

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Makefile

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+# Copyright 2019-present Cornell University
+# 
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy
+# of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software 
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 
+# License for the specific language governing permissions and limitations 
+# under the License.
+
+NAME=petr4
+
+.PHONY: all build clean %.exe
+
+all: build
+
+build:
+	dune build @install
+
+doc:
+	dune build @doc
+
+run:
+	dune exec $(NAME)  
+
+install:
+	dune install
+
+clean:
+	dune clean

bar

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+Goodbye

bin/dune

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+(executable
+  (public_name p4pp)
+  (name main)
+  (libraries core p4pp))

bin/main.ml

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+(* Copyright 2019-present Cornell University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy
+ * of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *)
+
+open Core
+open P4pp
+
+exception ParsingError of string
+
+let preprocess verbose include_dirs defines p4_file () = 
+  let buf = Buffer.create 101 in
+  let env = Eval.{ file = p4_file; defines } in
+  ignore (Eval.eval_file include_dirs env buf p4_file);
+  Format.print_string (Buffer.contents buf)
+    
+let command = 
+  let spec = 
+    let open Command.Spec in 
+    empty 
+    +> flag "-verbose" no_arg ~doc:"Verbose mode"
+    +> flag "-I" (listed string) ~doc:"<dir> Add directory to include search path" 
+    +> flag "-D" (listed string) ~doc:"<macro> Define macro" 
+    +> anon ("p4file" %:string) in
+  Command.basic_spec
+    ~summary:"p4pp: P4 preprocessor"
+    spec
+    preprocess
+
+let () = 
+  Format.printf "@[";
+  Command.run ~version:"0.1.1" command;
+  Format.printf "@]"

dune-project

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+(lang dune 1.2)
+(using menhir 1.0)
+(name p4pp)

dune-workspace

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+(lang dune 1.2)
+(env
+ (dev (flags (:standard -warn-error "-27-32" -w -27-32)))
+)

lib/ast.ml

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+type term = 
+  | String of string
+  | Include of int * bool * string
+  | Define of string
+  | Undef of string
+  | If of bool * string * term list * term list

lib/dune

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+(menhir
+  (flags --explain)
+  (modules parser))
+
+(ocamllex (modules lexer))
+
+(library
+  (public_name p4pp)
+  (name p4pp)
+   (libraries core))

lib/eval.ml

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+open Core
+open Ast
+
+type env = 
+  { file : string;
+    defines : string list }
+let empty file =
+   { file; defines = [] }
+let is_defined env m = 
+  List.mem env.defines m ~equal:(=)
+let define env m = 
+  if is_defined env m then env 
+  else { env with defines = m::env.defines }
+let undefine env m = 
+  { env with 
+    defines = List.filter env.defines ~f:(fun n -> n <> m) }
+let get_file env = env.file
+let set_file env file = { env with file }
+
+let rec eval (includes:string list) (env:env) (buf:Buffer.t) (term:term) : env = 
+  match term with 
+  | String(s) -> 
+     Buffer.add_string buf s;
+     env
+  | Include(line,search,file) -> 
+     let current = get_file env in 
+     Buffer.add_string buf (Printf.sprintf "#line \"%s\" %d\n" file 1);
+     let env = set_file env file in
+     let env = eval_file includes env buf file in
+     let env = set_file env current in 
+     Buffer.add_string buf "\n";
+     Buffer.add_string buf (Printf.sprintf "#line \"%s\" %d\n" current line);
+     env
+  | Define(m) -> 
+     let env = define env m in 
+     Buffer.add_string buf "\n";
+     env
+  | Undef(m) -> 
+     let env = undefine env m in 
+     Buffer.add_string buf "\n";
+     env
+  | If(b,m,tru,fls) ->
+     let defined = is_defined env m in
+     if b && defined || not (b || defined) then
+       List.fold_left ~init:env ~f:(fun env term -> eval includes env buf term) tru
+     else
+       List.fold_left ~init:env ~f:(fun env term -> eval includes env buf term) fls
+
+and eval_file (includes:string list) (env:env) (buf:Buffer.t) (file:string) : env = 
+  let in_chan = In_channel.create file in
+  let lexbuf = Lexing.from_channel in_chan in
+  let terms = 
+    try Parser.program Lexer.tokenize lexbuf 
+    with _ -> failwith ("Error parsing " ^ file) in 
+  List.fold_left ~init:env ~f:(fun env term -> eval includes env buf term) terms
+
+