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spel_parse.ml
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(* * This file is part of the Watson Conversation Service OCaml API project. * * Copyright 2016-2017 IBM Corporation * * 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 Spel_t open Spel_sedlexer_j exception LexError of string let error default msg = Log.error "Spel parsing" default msg let warning default msg = Log.warning "Spel parsing" msg; default type state = BodyLexing | ExprLexing (** {6 Expression lexer} *) let expr_lexer buff lb = Spel_sedlexer_j.token buff lb let mk_expr_lexer () = expr_lexer (Spel_util.string_buff ()) (** {6 lexing} *) let body_lexer st buff lb = begin match !st with | BodyLexing -> let tk = Spel_sedlexer_j.body buff lb in begin match tk with | Spel_parser_j.OPENEXPR _ -> st := ExprLexing ; tk | _ -> tk end | ExprLexing -> let tk = Spel_sedlexer_j.token buff lb in begin match tk with | Spel_parser_j.CLOSEEXPR -> st := BodyLexing ; tk | _ -> tk end end let mk_body_lexer () = body_lexer (ref BodyLexing) (Spel_util.string_buff ()) (** {6 desugaring} *) let rec fold_expr f e = let desc = begin match e.expr_desc with | E_lit l -> E_lit l | E_prop (e, s) -> E_prop (fold_expr f e, s) | E_prop_catch (e, s) -> E_prop_catch (fold_expr f e, s) | E_get (e1, e2) -> E_get (fold_expr f e1, fold_expr f e2) | E_list el -> E_list (List.map (fold_expr f) el) | E_new_array (t, ilo, elo) -> begin match elo with | None -> E_new_array (t, ilo, None) | Some el -> E_new_array (t, ilo, Some (List.map (fold_expr f) el)) end | E_new (t, el) -> E_new (t, List.map (fold_expr f) el) | E_call (eo, s, el) -> begin match eo with | None -> E_call (None, s, List.map (fold_expr f) el) | Some e -> E_call (Some (fold_expr f e), s, List.map (fold_expr f) el) end | E_call_catch (eo, s, el) -> begin match eo with | None -> E_call_catch (None, s, List.map (fold_expr f) el) | Some e -> E_call_catch (Some (fold_expr f e), s, List.map (fold_expr f) el) end | E_op (op, el) -> E_op (op, List.map (fold_expr f) el) | E_conditional (e1, e2, e3) -> E_conditional (fold_expr f e1, fold_expr f e2, fold_expr f e3) | E_ident s -> E_ident s (* WCS extensions *) | E_anything_else -> E_anything_else | E_context -> E_context | E_conversation_start -> E_conversation_start | E_entities -> E_entities | E_input -> E_input | E_intents -> E_intents | E_output -> E_output | E_variable s -> E_variable s | E_intent s -> E_intent s | E_entity (s1, s2) -> E_entity (s1, s2) (* Fallback *) | E_error s -> E_error s end in let desc = f desc in let loc = e.expr_loc in let text = e.expr_text in Spel_util.mk_expr_full desc loc text let refresh_expr_text e = begin match e.expr_text with | None -> () | Some t -> e.expr_text <- Some (Spel_print.to_string e) end let desugar_spel = ref false let desugar_desc e = begin match e with (* Shorthand syntax for variables *) | E_variable (v, None) -> E_get (Spel_util.mk_expr E_context, Spel_util.mk_expr (E_lit (L_string v))) | E_variable (v, Some s) -> E_op (Op_eq, [Spel_util.mk_expr (E_get (Spel_util.mk_expr E_context, Spel_util.mk_expr (E_lit (L_string v)))); Spel_util.mk_expr (E_lit (L_string s))]) | _ -> e end let desugar e = fold_expr desugar_desc e let resugar_spel = ref false let resugar_desc e = begin match e with (* Shorthand syntax for variables *) | E_get ({ expr_desc = E_context }, { expr_desc = E_lit (L_string s) }) -> E_variable (s,None) (* XXX Keeps equality intact when resugaring | E_op (Op_eq, [{ expr_desc = E_get ({ expr_desc = E_context }, { expr_desc = (E_lit (L_string v)) }) }; { expr_desc = E_lit (L_string s) }]) -> E_variable (v, Some s) XXX *) | _ -> e end let resugar e = fold_expr resugar_desc e let sugarer e = let e = if !desugar_spel then desugar e else e in let e = if !resugar_spel then resugar e else e in e (** {6 parsers} *) let fix_empty_condition ocond = begin match ocond with | Some cond -> cond | None -> Spel_util.mk_expr (E_lit (L_boolean false)) end let expression_from_file f = fix_empty_condition (Spel_util.uparse_file Spel_parser_j.condition_main (mk_expr_lexer ()) f) let expr_from_file s = sugarer (expression_from_file s) let expression_from_string s = begin try let parsed = Spel_util.uparse_string Spel_parser_j.condition_main (mk_expr_lexer ()) s in let ast = fix_empty_condition parsed in ast.expr_text <- Some s; ast with | LexError msg -> warning (Spel_util.mk_expr_text (E_error msg) (Some s)) (Format.sprintf "[%s] in expression: '%s'" msg s) | _ -> warning (Spel_util.mk_expr_text (E_error "Parse error in expression") (Some s)) (Format.sprintf "error in expression: '%s'" s) end let expr_from_string s = sugarer (expression_from_string s) let expression_from_quoted_file f = Spel_util.uparse_file Spel_parser_j.body_main (mk_body_lexer ()) f let quoted_expr_from_file s = sugarer (expression_from_quoted_file s) let expression_from_quoted_string s = begin try let ast = Spel_util.uparse_string Spel_parser_j.body_main (mk_body_lexer ()) s in ast.expr_text <- Some s; ast with | LexError msg -> warning (Spel_util.mk_expr_text (E_error msg) (Some s)) (Format.sprintf "[%s] in text: '%s'" msg s) | _ -> warning (Spel_util.mk_expr_text (E_error "Parse error in text") (Some s)) (Format.sprintf "in text: '%s'" s) end let quoted_expr_from_string s = sugarer (expression_from_quoted_string s)