Class: RDF::N3::Reader

Inherits:
Reader show all
Includes:
EBNF::LL1::Parser, Terminals, Util::Logger
Defined in:
vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb

Overview

TODO:

A Notation-3/Turtle parser in Ruby

N3 Parser, based in librdf version of predictiveParser.py Separate pass to create branch_table from n3-selectors.n3

This implementation only supports quickVars at the document scope.

Non-distinguished blank node variables are created as part of reasoning.

  • Formulae as RDF::Query representations
  • Formula expansion similar to SPARQL Construct

See Also:

Author:

Defined Under Namespace

Classes: Recovery, SyntaxError

Constant Summary

Constants included from Terminals

Terminals::ANON, Terminals::BASE, Terminals::BLANK_NODE_LABEL, Terminals::DECIMAL, Terminals::DOUBLE, Terminals::ECHAR, Terminals::ESCAPE_CHAR4, Terminals::ESCAPE_CHAR8, Terminals::EXPONENT, Terminals::INTEGER, Terminals::IPLSTART, Terminals::IRIREF, Terminals::IRI_RANGE, Terminals::LANGTAG, Terminals::PERCENT, Terminals::PLX, Terminals::PNAME_LN, Terminals::PNAME_NS, Terminals::PN_CHARS, Terminals::PN_CHARS_BASE, Terminals::PN_CHARS_BODY, Terminals::PN_CHARS_U, Terminals::PN_LOCAL, Terminals::PN_LOCAL_BODY, Terminals::PN_LOCAL_ESC, Terminals::PN_PREFIX, Terminals::PREFIX, Terminals::QUICK_VAR_NAME, Terminals::STRING_LITERAL_LONG_QUOTE, Terminals::STRING_LITERAL_LONG_SINGLE_QUOTE, Terminals::STRING_LITERAL_QUOTE, Terminals::STRING_LITERAL_SINGLE_QUOTE, Terminals::UCHAR, Terminals::U_CHARS1, Terminals::U_CHARS2, Terminals::WS

Constants included from Util::Logger

Util::Logger::IOWrapper

Instance Attribute Summary collapse

Attributes included from EBNF::LL1::Parser

#lineno

Attributes inherited from Reader

#options

Attributes included from Enumerable

#existentials, #universals

Class Method Summary collapse

Instance Method Summary collapse

Methods included from EBNF::LL1::Parser

#add_prod_data, #add_prod_datum, #depth, #parse, #prod_data, #warn

Methods included from Util::Logger

#log_debug, #log_depth, #log_error, #log_fatal, #log_info, #log_recover, #log_recovering?, #log_statistics, #log_warn, #logger

Methods inherited from Reader

#base_uri, #canonicalize?, #close, each, #each_pg_statement, #encoding, #fail_object, #fail_predicate, #fail_subject, for, format, #intern?, #lineno, open, #prefix, #prefixes, #prefixes=, #read_statement, #read_triple, #rewind, #to_sym, to_sym, #valid?, #validate?

Methods included from Util::Aliasing::LateBound

#alias_method

Methods included from Enumerable

add_entailment, #canonicalize, #canonicalize!, #dump, #each_graph, #each_object, #each_predicate, #each_quad, #each_subject, #each_term, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph?, #graph_names, #invalid?, #method_missing, #object?, #objects, #predicate?, #predicates, #project_graph, #quad?, #quads, #respond_to_missing?, #statement?, #statements, #subject?, #subjects, #supports?, #term?, #terms, #to_a, #to_h, #to_set, #triple?, #triples, #valid?, #validate!

Methods included from Isomorphic

#bijection_to, #isomorphic_with?

Methods included from Countable

#count, #empty?

Methods included from Readable

#readable?

Constructor Details

#initialize(input = $stdin, **options) {|reader| ... } ⇒ reader

Initializes the N3 reader instance.

Parameters:

  • input (IO, File, String) (defaults to: $stdin) —

    the input stream to read

  • options (Hash) —

    a customizable set of options

Options Hash (**options):

  • :base_uri (#to_s) — default: nil —

    the base URI to use when resolving relative URIs (not supported by all readers)

  • :validate (Boolean) — default: false —

    whether to validate the parsed statements and values

  • :canonicalize (Boolean) — default: false —

    whether to canonicalize parsed literals and URIs.

  • :prefixes (Hash) — default: Hash.new —

    the prefix mappings to use (not supported by all readers)

  • :list_terms (Hash) — default: false —

    represent collections as an RDF::Term, rather than an rdf:first/rest ladder.

Yields:

  • (reader) —

    self

Yield Parameters:

Yield Returns:

  • (void) —

    ignored

Raises:

  • (Error) —

    :: Raises RDF::ReaderError if validating and an error is found



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 83

def initialize(input = $stdin, **options, &block)
  super do
    @options = {
      anon_base:  "b0",
      whitespace:  WS,
      depth: 0,
    }.merge(@options)
    @prod_stack = []

    @formulae = []
    @formula_nodes = {}
    @label_uniquifier = "0"
    @bnodes = {}
    @bn_labler = @options[:anon_base].dup
    @bn_mapper = {}
    @variables = {}

    if options[:base_uri]
      progress("base_uri") { base_uri.inspect}
      namespace(nil, iri(base_uri.to_s.match?(%r{[#/]$}) ? base_uri : "#{base_uri}#"))
    end

    # Prepopulate operator namespaces unless validating
    unless validate?
      namespace(:rdf, RDF.to_uri)
      namespace(:rdfs, RDF::RDFS.to_uri)
      namespace(:xsd, RDF::XSD.to_uri)
      namespace(:crypto, RDF::N3::Crypto.to_uri)
      namespace(:list, RDF::N3::List.to_uri)
      namespace(:log, RDF::N3::Log.to_uri)
      namespace(:math, RDF::N3::Math.to_uri)
      namespace(:rei, RDF::N3::Rei.to_uri)
      #namespace(:string, RDF::N3::String.to_uri)
      namespace(:time, RDF::N3::Time.to_uri)
    end
    progress("validate") {validate?.inspect}
    progress("canonicalize") {canonicalize?.inspect}

    @lexer = EBNF::LL1::Lexer.new(input, self.class.patterns, **@options)

    if block_given?
      case block.arity
        when 0 then instance_eval(&block)
        else block.call(self)
      end
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Enumerable

Instance Attribute Details

#formula_nodes ⇒ Hash{RDF::Node => RDF::Graph} (readonly)

All nodes allocated to formulae

Returns:



40
41
42
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 40

def formula_nodes
  @formula_nodes
end

#formulae ⇒ Array<RDF::Node> (readonly)

Nodes used as Formulae graph names

Returns:



35
36
37
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 35

def formulae
  @formulae
end

#variables ⇒ Hash{Symbol => RDF::Node} (readonly)

Allocated variables by formula

Returns:



45
46
47
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 45

def variables
  @variables
end

Class Method Details

.options ⇒ Object

N3 Reader options

See Also:



50
51
52
53
54
55
56
57
58
59
60
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 50

def self.options
  super + [
    RDF::CLI::Option.new(
      symbol: :list_terms,
      datatype: TrueClass,
      default: true,
      control: :checkbox,
      on: ["--list-terms CONTEXT"],
      description: "Use native collections (lists), not first/rest ladder.")
  ]
end

Instance Method Details

#each_statement {|statement| ... }

This method returns an undefined value.

Iterates the given block for each RDF statement in the input.

Yields:

  • (statement)

Yield Parameters:



141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 141

def each_statement(&block)
  if block_given?
    log_recover
    @callback = block

    begin
      while (@lexer.first rescue true)
        read_n3Doc
      end
    rescue EBNF::LL1::Lexer::Error, SyntaxError, EOFError, Recovery
      # Terminate loop if EOF found while recovering
    end

    if validate? && log_statistics[:error]
      raise RDF::ReaderError, "Errors found during processing"
    end
  end
  enum_for(:each_statement)
end

#each_triple {|subject, predicate, object| ... }

This method returns an undefined value.

Iterates the given block for each RDF triple in the input.

Yields:

  • (subject, predicate, object)

Yield Parameters:



169
170
171
172
173
174
175
176
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 169

def each_triple
  if block_given?
    each_statement do |statement|
      yield(*statement.to_triple)
    end
  end
  enum_for(:each_triple)
end

#inspect ⇒ Object 



132
133
134
 
# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-n3-a6ef81a7e1ce/lib/rdf/n3/reader.rb', line 132

def inspect
  sprintf("#<%s:%#0x(%s)>", self.class.name, __id__, base_uri.to_s)
end