xml_parser.trx

(*
    Copyright © 2011 MLstate

    This file is part of OPA.

    OPA is free software: you can redistribute it and/or modify it under the
    terms of the GNU Affero General Public License, version 3, as published by
    the Free Software Foundation.

    OPA is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
    more details.

    You should have received a copy of the GNU Affero General Public License
    along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
##
## @author Valentin Gatien-Baron
##


{{ open Parser_utils
   open SurfaceAst
 }}

spacing <- Xml.spacing;

let deco rule = (=Opa_lexer.deco(rule));
let careful_deco rule = (=Opa_lexer.careful_deco(rule));
let exact_ident rule = (=Opa_parser.exact_ident(rule));

/** xml parser **/
xml_parser <- (=Opa_lexer.exact_ident("xml_parser")) spacing xml_parser_no_keyword:v {{ v }}

;deco_xml_parser_no_keyword = deco xml_parser_no_keyword;
xml_parser_no_keyword <-
                Opa_lexer.BAR? xml_rule:v (Opa_lexer.BAR xml_rule:v {{v}})*:l
                Opa_parser.match_end {{ (xml_parser (v::l : _ xml_parser) : (_,_) expr_node) }}

trx_parser <- Opa_lexer.PARSER? Trx.Item+:l (*Trx.ParserSeq:e*) {{ l }}

/** xml parser rule **/
xml_rule <- spacing xml_named_pattern+:pl Opa_lexer.rarrow Opa_parser.expr:e {{ ((pl,e) : _ xml_rule) }}

ident_except_parser <- !("parser" Opa_lexer.end_of_ident_nosp) Opa_lexer.ml_identifier:i {{ i }}

/* xml named pattern */
xml_named_pattern <- spacing ident_except_parser:i xml_suffix?:o spacing !Opa_lexer.assign {{ ((Some i, XmlAny, o) : _ xml_named_pattern) }}
                   / spacing (ident_except_parser:i Opa_lexer.assign spacing {{i}})?:i
                       xml_pattern:p xml_suffix?:o spacing
                     {{ ((i, p, o) : _ xml_named_pattern) }}
                   / spacing trx_parser:e spacing {{ (None, XmlParser e, None) }}


/** xml parser pattern **/
xml_pattern <- Xml.begin_open_tag:nstag attribute*:l
                ( Xml.close_sign spacing xml_named_pattern*:l
                  Xml.close_tag_or_frag:close_tag {{ (l, close_tag) }}
                / Xml.autoclose {{ ([],None) }}):p {{
                    let rev_bindings, rev_l = List.fold_left
                      (fun (rev_bindings,rev_l) -> function
                       | `define (bnd:(string * (_,_) expr)) -> (bnd :: rev_bindings, rev_l)
                       | `normal_attr v -> (rev_bindings, v :: rev_l)
                      ) ([],[]) l in
                    let (children, end_tago) = p in
                    Option.iter (tag_mismatch nstag) end_tago;
                    let ns, tag = nstag in
                    let ns =
                      let string, label = ns in
                      (SA.Ident ("xmlns:"^string), label) in
                    let node = XmlNode ({namespace = ns; name = tag}, rev_l, children) in
                    if rev_bindings = [] then node
                    else SA.XmlLetIn (rev_bindings, node)
                }}
             / "_" Opa_lexer.end_of_ident_nosp  {{ XmlAny }}
             / Opa_parser.opa_in_braces_nosp:e {{ XmlExpr e }}
             / Opa_lexer.lpar deco_xml_parser_no_keyword:e Opa_lexer.rpar {{ XmlExpr e }}

attribute_lhs <- Xml.namespace:ns Xml.deco_ename:name spacing
                   {{ match ns, name with
                      | ("xmlns",_), (name,label) ->
                          `define ("xmlns:"^name, label)
                      | ("",_), ("xmlns",label) ->
                          `define ("xmlns:", label)
                      | _ ->
                          let ns =
                            let string, label = ns in
                            (SA.Ident ("xmlns:"^string), label) in
                          `normal_attr {namespace = ns; name = name} }}
attribute_value <- ( String_expr.string_with_opa:e {{ XmlAttrStringParser e }}
                   / Opa_parser.opa_in_braces:e {{ XmlAttrParser e }}
                   / Opa_lexer.underscore {{ XmlExists }}
                   ):e {{ e }}
attribute_rhs <- Opa_lexer.assign spacing
                   ( attribute_value:e {{ e, None }}
                   / Opa_lexer.lpar attribute_value:e Opa_lexer.AS Opa_lexer.ml_identifier:i Opa_lexer.rpar {{ e, Some i}} ):v
                 {{ v }}
               / !Opa_lexer.assign {{ XmlName, None }}

/* xml parser attribute value */
attribute <- spacing attribute_lhs:name attribute_rhs:e {{
               match name with
               | `define (name, label) -> (
                   let e =
                     match e with
                     | _, Some _ -> error1 (Printf.sprintf "You cannot put a 'as' on an xmlns declaration.") label
                     | XmlExists, None -> error1 (Printf.sprintf "'_' is not an expression.") label
                     | XmlAttrParser e, None
                     | XmlAttrStringParser e, None -> e
                     | XmlName, None -> (SA.Ident name, label) in
                   `define ((name,e):(string * (string,_) expr))
                 )
               | `normal_attr name -> `normal_attr (name, snd e, fst e)
             }}

;xml_suffix = deco just_xml_suffix;
just_xml_suffix <- "?" {{ Xml_question }}
            / "+" {{ Xml_plus }}
            / "*" {{ Xml_star }}
            / Opa_parser.lbrace Opa_parser.expr:e1
              (Opa_parser.comma Opa_parser.expr:e2 {{e2}})?:oe2 Opa_parser.rbrace
             {{ match oe2 with None -> Xml_number e1 | Some e2 -> Xml_range (e1,e2) }}