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/*
Copyright © 2011 MLstate

This file is part of Opa.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/**
* Parsers for rdf modules
*
* This file provides parsers for several rdf format.
*
* @author Anthonin Bonnefoy, 2011
* @category api
* @destination public
*/


/**
* Parser for the nt rdf format used for base dump
*/
NtParser = {{

  @private any = parser t=((!Rule.white_space .)+) -> Text.to_string(t)
  @private sep = parser Rule.ws -> void

  @private parse_nt = parser
    | sep res=any sep pre=any sep val=any sep "." sep -> (res, pre,val)

  @private parse_nts = parser
    | lst={Rule.parse_list(parse_nt, sep)} -> lst

  try_parse(dump):option(Rdf.base) = Parser.try_parse(parse_nts, dump)

}}

/**
* Parser for a rdf query
*/
QueryParser = {{

  @private any = parser t=((!Rule.white_space ![{}] .)+) -> Text.to_string(t)
  @private sep = Rule.ws

  @private uri_value= parser
    | "<" t=((!Rule.white_space !". " !"}" !">" .)+) ">" -> Text.to_string(t)

  @private parse_prefix = parser
    | "PREFIX" sep pref=any sep value=uri_value -> (pref, value)

  @private parse_variable = parser
    | sep "?" var=any sep -> var

  @private parse_select = parser
    | "SELECT" sep "*" sep -> { all }
    | "SELECT" sep vars={ Rule.parse_list_non_empty(parse_variable, sep) } sep -> { vars = vars }

  @private parse_where_value = parser
    | t=((!Rule.white_space !". " !"}" .)+) -> Text.to_string(t)

  @private parse_where_element = parser
    | sep var=parse_variable sep -> { var = var }
    | sep value=parse_where_value sep -> { value = value }

  @private parse_where_tuple = parser
    | t={Rule.rep(3, parse_where_element)} -> t

  @private where_element_separator = parser
    | sep "." sep -> void

  @private parse_where = parser
    | "WHERE" sep "\{" wheres={Rule.parse_list_non_empty(parse_where_tuple, where_element_separator)} where_element_separator? "}" sep -> wheres

  @private parse_query = parser
    | sep
      prefix={Rule.parse_list(parse_prefix, sep)} sep
      select=parse_select sep
      where=parse_where .*
      -> { ~prefix; ~select; ~where }

  try_parse(query):option(Rdf.query) = Parser.try_parse(parse_query, query)
}}
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