Class: RDF::Turtle::Reader
- Includes:
- EBNF::LL1::Parser, Terminals, Util::Logger
- Defined in:
- vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb
Overview
A parser for the Turtle 2
Direct Known Subclasses
Defined Under Namespace
Classes: Recovery, SyntaxError
Constant Summary
Constants included from Util::Logger
Constants included from Terminals
Terminals::ANON, Terminals::BASE, Terminals::BLANK_NODE_LABEL, Terminals::DECIMAL, Terminals::DOUBLE, Terminals::ECHAR, Terminals::EXPONENT, Terminals::INTEGER, Terminals::IRIREF, Terminals::IRI_RANGE, Terminals::LANG_DIR, 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::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
Instance Attribute Summary
Attributes included from EBNF::LL1::Parser
Attributes inherited from Reader
Attributes included from Enumerable
Class Method Summary collapse
-
.options ⇒ Object
Reader options.
Instance Method Summary collapse
-
#add_statement(production, statement) ⇒ RDF::Statement
add a statement, object can be literal or URI or bnode.
-
#bnode(value = nil) ⇒ Object
Keep track of allocated BNodes.
- #debug(*args, &block) ⇒ Object protected
-
#each_statement {|statement| ... }
Iterates the given block for each RDF statement in the input.
-
#each_triple {|subject, predicate, object| ... }
Iterates the given block for each RDF triple in the input.
-
#error(node, message, options) ⇒ Object
protected
Error information, used as level
0
debug messages. -
#initialize(input = nil, **options, &block) ⇒ RDF::Turtle::Reader
constructor
Initializes a new reader instance.
- #inspect ⇒ Object
-
#literal(value, **options) ⇒ Object
Create a literal.
-
#pname(prefix, suffix) ⇒ Object
Expand a PNAME using string concatenation.
-
#prefix(prefix, iri = nil) ⇒ Object
Override #prefix to take a relative IRI.
-
#process_iri(iri) ⇒ Object
Process a URI against base.
- #prod(production, recover_to = []) ⇒ Object protected
- #progress(*args, &block) ⇒ Object protected
-
#read_annotation(subject, predicate, object) ⇒ Object
protected
Read an annotation on a triple.
- #read_BlankNode ⇒ RDF::Node protected
- #read_blankNodePropertyList ⇒ RDF::Node protected
- #read_collection ⇒ RDF::Node protected
-
#read_directive
protected
Read directive.
- #read_iri ⇒ RDF::URI protected
- #read_literal ⇒ RDF::Literal protected
-
#read_object(subject = nil, predicate = nil)
protected
Read object.
-
#read_objectList(subject, predicate) ⇒ RDF::Term
protected
Read objectList.
-
#read_predicateObjectList(subject) ⇒ RDF::URI
protected
Read predicateObjectList.
-
#read_reifiedTriple ⇒ RDF::Term
protected
Read reifiedTriple.
-
#read_statement
protected
Read objectList.
-
#read_subject ⇒ RDF::Resource
protected
subject ::= iri | BlankNode | collection.
-
#read_triples ⇒ Object
protected
Read triples.
-
#read_tripleTerm ⇒ RDF::Statement
protected
Read triple term.
-
#read_ttObject(subject = nil, predicate = nil) ⇒ RDF::Term
protected
Read ttObject.
-
#read_ttSubject ⇒ RDF::Term
protected
Read ttSubject.
-
#read_verb ⇒ RDF::URI
protected
Read verb.
- #recover(*args, &block) ⇒ Object protected
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 included from EBNF::LL1::Parser
#add_prod_data, #add_prod_datum, #depth, #parse, #prod_data, #warn
Methods inherited from Reader
#base_uri, #canonicalize?, #close, each, #each_pg_statement, #encoding, #fail_object, #fail_predicate, #fail_subject, for, format, #intern?, #lineno, open, #prefixes, #prefixes=, #read_triple, #rewind, #to_sym, to_sym, #valid?, #validate?
Methods included from Util::Aliasing::LateBound
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
Methods included from Readable
Constructor Details
#initialize(input = nil, **options, &block) ⇒ RDF::Turtle::Reader
Initializes a new reader instance.
Note, the spec does not define a default mapping for the empty prefix, but it is so commonly used in examples that we define it to be the empty string anyway, except when validating.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 94 def initialize(input = nil, **, &block) super do @options = { anon_base: "b0", whitespace: WS, depth: 0, }.merge(@options) @prod_stack = [] @options[:base_uri] = RDF::URI(base_uri || "") debug("base IRI") {base_uri.inspect} debug("validate") {validate?.inspect} debug("canonicalize") {canonicalize?.inspect} debug("intern") {intern?.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
Class Method Details
.options ⇒ Object
Reader options
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 46 def self. super + [ RDF::CLI::Option.new( symbol: :freebase, datatype: TrueClass, on: ["--freebase"], description: "Use optimized Freebase reader.") {true}, ] end |
Instance Method Details
#add_statement(production, statement) ⇒ RDF::Statement
add a statement, object can be literal or URI or bnode
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 174 def add_statement(production, statement) error("Statement is invalid: #{statement.inspect}", production: produciton) if validate? && statement.invalid? @callback.call(statement) if statement.subject && statement.predicate && statement.object && (validate? ? statement.valid? : true) end |
#bnode(value = nil) ⇒ Object
Keep track of allocated BNodes
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 245 def bnode(value = nil) return RDF::Node.new unless value @bnode_cache ||= {} @bnode_cache[value.to_s] ||= RDF::Node.new(value) end |
#debug(*args, &block) ⇒ Object (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 750 def debug(*args, &block) lineno = ([:token].lineno if [:token].respond_to?(:lineno)) || (@lexer && @lexer.lineno) opts = args.last.is_a?(Hash) ? args.pop : {} opts[:level] ||= 0 opts[:lineno] ||= lineno log_debug(*args, **opts, &block) end |
#each_statement {|statement| ... }
This method returns an undefined value.
Iterates the given block for each RDF statement in the input.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 131 def each_statement(&block) if block_given? log_recover @callback = block begin while (@lexer.first rescue true) read_statement 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.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 159 def each_triple(&block) if block_given? each_statement do |statement| block.call(*statement.to_triple) end end enum_for(:each_triple) end |
#error(node, message, options) ⇒ Object (protected)
Error information, used as level 0
debug messages.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 768 def error(*args) ctx = "" ctx += "(found #{[:token].inspect})" if [:token] ctx += ", production = #{[:production].inspect}" if [:production] lineno = @lineno || ([:token].lineno if [:token].respond_to?(:lineno)) || @lexer.lineno log_error(*args, ctx, lineno: lineno, token: [:token], production: [:production], depth: [:depth], exception: SyntaxError,) end |
#inspect ⇒ Object
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 121 def inspect sprintf("#<%s:%#0x(%s)>", self.class.name, __id__, base_uri.to_s) end |
#literal(value, **options) ⇒ Object
Create a literal
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 196 def literal(value, **) debug("literal", depth: @options[:depth]) do "value: #{value.inspect}, " + "options: #{.inspect}, " + "validate: #{validate?.inspect}, " + "c14n?: #{canonicalize?.inspect}" end RDF::Literal.new(value, validate: validate?, canonicalize: canonicalize?, **) rescue ArgumentError => e error("Argument Error #{e.}", production: :literal, token: @lexer.first) end |
#pname(prefix, suffix) ⇒ Object
Expand a PNAME using string concatenation
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 222 def pname(prefix, suffix) # Prefixes must be defined, except special case for empty prefix being alias for current @base base = if prefix(prefix) prefix(prefix).to_s elsif prefix.to_s.empty? && !validate? base_uri.to_s else error("undefined prefix", production: :pname, token: prefix) '' end # Unescape PN_LOCAL_ESC suffix = suffix.gsub(PN_LOCAL_ESC) {|esc| esc[1]} if suffix.match?(PN_LOCAL_ESC) # Remove any redundant leading hash from suffix suffix = suffix.sub(/^\#/, "") if base.index("#") debug("pname", depth: [:depth]) {"base: '#{base}', suffix: '#{suffix}'"} process_iri(base + suffix.to_s) end |
#prefix(prefix, iri = nil) ⇒ Object
Override #prefix to take a relative IRI
prefix directives map a local name to an IRI, also resolved against the current In-Scope Base URI. Spec confusion, presume that an undefined empty prefix has an empty relative IRI, which uses string contatnation rules against the in-scope IRI at the time of use
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 214 def prefix(prefix, iri = nil) # Relative IRIs are resolved against @base iri = process_iri(iri) if iri super(prefix, iri) end |
#process_iri(iri) ⇒ Object
Process a URI against base
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 183 def process_iri(iri) iri = iri.value[1..-2] if iri === :IRIREF value = RDF::URI(iri) value = base_uri.join(value) if value.relative? value.validate! if validate? value.canonicalize! if canonicalize? && !value.frozen? value = RDF::URI.intern(value) if intern? value rescue ArgumentError => e error("process_iri", e) end |
#prod(production, recover_to = []) ⇒ Object (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 680 def prod(production, recover_to = []) @prod_stack << {prod: production, recover_to: recover_to} @options[:depth] += 1 recover("#{production}(start)", depth: [:depth], token: @lexer.first) yield rescue EBNF::LL1::Lexer::Error, SyntaxError, Recovery => e # Lexer encountered an illegal token or the parser encountered # a terminal which is inappropriate for the current production. # Perform error recovery to find a reasonable terminal based # on the follow sets of the relevant productions. This includes # remaining terms from the current production and the stacked # productions case e when EBNF::LL1::Lexer::Error @lexer.recover begin error("Lexer error", "With input '#{e.input}': #{e.}", production: production, token: e.token) rescue SyntaxError end end raise EOFError, "End of input found when recovering" if @lexer.first.nil? debug("recovery", "current token: #{@lexer.first.inspect}", depth: [:depth]) unless e.is_a?(Recovery) # Get the list of follows for this sequence, this production and the stacked productions. debug("recovery", "stack follows:", depth: [:depth]) @prod_stack.reverse.each do |prod| debug("recovery", level: 4, depth: [:depth]) {" #{prod[:prod]}: #{prod[:recover_to].inspect}"} end end # Find all follows to the top of the stack follows = @prod_stack.map {|prod| Array(prod[:recover_to])}.flatten.compact.uniq # Skip tokens until one is found in follows while (token = (@lexer.first rescue @lexer.recover)) && follows.none? {|t| token === t} skipped = @lexer.shift debug("recovery", depth: [:depth]) {"skip #{skipped.inspect}"} end debug("recovery", depth: [:depth]) {"found #{token.inspect} in follows"} # Re-raise the error unless token is a follows of this production raise Recovery unless Array(recover_to).any? {|t| token === t} # Skip that token to get something reasonable to start the next production with @lexer.shift ensure progress("#{production}(finish)", depth: [:depth]) @options[:depth] -= 1 @prod_stack.pop end |
#progress(*args, &block) ⇒ Object (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 734 def progress(*args, &block) lineno = ([:token].lineno if [:token].respond_to?(:lineno)) || (@lexer && @lexer.lineno) opts = args.last.is_a?(Hash) ? args.pop : {} opts[:level] ||= 1 opts[:lineno] ||= lineno log_info(*args, **opts, &block) end |
#read_annotation(subject, predicate, object) ⇒ Object (protected)
Read an annotation on a triple
annotation := (reifier | annotationBlock)*
The reifier
becomes the identifier for a subsequent annotation block (if it exists). If there is no reifier, then a blank node is created.
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 543 def read_annotation(subject, predicate, object) error("Unexpected end of file", production: :annotation) unless @lexer.first tt = RDF::Statement(subject, predicate, object, tripleTerm: true) reifier = nil while %w(~ {|).include? @lexer.first.to_s if @lexer.first === '~' prod(:annotation, %(~)) do @lexer.shift # eat '~' reifier = read_iri || read_BlankNode || bnode add_statement('annotation', RDF::Statement(reifier, RDF.reifies, tt)) end else prod(:annotation, %({||})) do @lexer.shift # eat '{|' unless reifier # Emit the reifiedTriple reifier = bnode add_statement('annotation', RDF::Statement(reifier, RDF.reifies, tt)) end # id becomes subject for predicateObjectList read_predicateObjectList(reifier) || error("Expected predicateObjectList", production: :annotation, token: @lexer.first) error("annotation", "Expected closing '|}'") unless @lexer.first === '|}' @lexer.shift # eat '|}' reifier = nil end end end end |
#read_BlankNode ⇒ RDF::Node (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 672 def read_BlankNode token = @lexer.first case token && token.type when :BLANK_NODE_LABEL then prod(:BlankNode) {bnode(@lexer.shift.value[2..-1])} when :ANON then @lexer.shift && prod(:BlankNode) {bnode} end end |
#read_blankNodePropertyList ⇒ RDF::Node (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 625 def read_blankNodePropertyList token = @lexer.first if token === '[' prod(:blankNodePropertyList, %{]}) do @lexer.shift progress("blankNodePropertyList", depth: [:depth]) {"token: #{token.inspect}"} node = bnode read_predicateObjectList(node) error("blankNodePropertyList", "Expected closing ']'") unless @lexer.first === ']' @lexer.shift node end end end |
#read_collection ⇒ RDF::Node (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 641 def read_collection if @lexer.first === '(' prod(:collection, %{)}) do @lexer.shift token = @lexer.first progress("collection", depth: [:depth]) {"token: #{token.inspect}"} objects = [] while object = read_object objects << object end list = RDF::List.new(values: objects) list.each_statement do |statement| add_statement("collection", statement) end error("collection", "Expected closing ')'") unless @lexer.first === ')' @lexer.shift list.subject end end end |
#read_directive (protected)
This method returns an undefined value.
Read directive
directive ::= prefixID | base | sparqlPrefix | sparqlBase
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 283 def read_directive prod(:directive, %w{.}) do token = @lexer.first case token.type when :BASE prod(:base) do @lexer.shift terminated = token.value == '@base' iri = @lexer.shift error("Expected IRIREF", production: :base, token: iri) unless iri === :IRIREF @options[:base_uri] = process_iri(iri) error("base", "#{token} should be downcased") if token.value.start_with?('@') && token.value != '@base' if terminated error("base", "Expected #{token} to be terminated") unless @lexer.first === '.' @lexer.shift elsif @lexer.first === '.' error("base", "Expected #{token} not to be terminated") else true end end when :PREFIX prod(:prefixID, %w{.}) do @lexer.shift pfx, iri = @lexer.shift, @lexer.shift terminated = token.value == '@prefix' error("Expected PNAME_NS", production: :prefix, token: pfx) unless pfx === :PNAME_NS error("Expected IRIREF", production: :prefix, token: iri) unless iri === :IRIREF debug("prefixID", depth: [:depth]) {"Defined prefix #{pfx.inspect} mapping to #{iri.inspect}"} prefix(pfx.value[0..-2], process_iri(iri)) error("prefixId", "#{token} should be downcased") if token.value.start_with?('@') && token.value != '@prefix' if terminated error("prefixID", "Expected #{token} to be terminated") unless @lexer.first === '.' @lexer.shift elsif @lexer.first === '.' error("prefixID", "Expected #{token} not to be terminated") else true end end end end end |
#read_iri ⇒ RDF::URI (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 663 def read_iri token = @lexer.first case token && token.type when :IRIREF then prod(:iri) {process_iri(@lexer.shift)} when :PNAME_LN, :PNAME_NS then prod(:iri) {pname(*@lexer.shift.value.split(':', 2))} end end |
#read_literal ⇒ RDF::Literal (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 577 def read_literal error("Unexpected end of file", production: :literal) unless token = @lexer.first case token.type || token.value when :INTEGER then prod(:literal) {literal(@lexer.shift.value, datatype: RDF::XSD.integer)} when :DECIMAL prod(:literal) do value = @lexer.shift.value value = "0#{value}" if value.start_with?(".") literal(value, datatype: RDF::XSD.decimal) end when :DOUBLE then prod(:literal) {literal(@lexer.shift.value.sub(/\.([eE])/, '.0\1'), datatype: RDF::XSD.double)} when "true", "false" then prod(:literal) {literal(@lexer.shift.value, datatype: RDF::XSD.boolean)} when :STRING_LITERAL_QUOTE, :STRING_LITERAL_SINGLE_QUOTE prod(:literal) do value = @lexer.shift.value[1..-2] error("read_literal", "Unexpected end of file") unless token = @lexer.first case token.type || token.value when :LANG_DIR lang_dir = @lexer.shift.value[1..-1] language, direction = lang_dir.split('--') literal(value, language: language, direction: direction) when '^^' @lexer.shift literal(value, datatype: read_iri) else literal(value) end end when :STRING_LITERAL_LONG_QUOTE, :STRING_LITERAL_LONG_SINGLE_QUOTE prod(:literal) do value = @lexer.shift.value[3..-4] error("read_literal", "Unexpected end of file") unless token = @lexer.first case token.type || token.value when :LANG_DIR lang_dir = @lexer.shift.value[1..-1] language, direction = lang_dir.split('--') literal(value, language: language, direction: direction) when '^^' @lexer.shift literal(value, datatype: read_iri) else literal(value) end end end end |
#read_object(subject = nil, predicate = nil) (protected)
This method returns an undefined value.
Read object
object ::= iri | BlankNode | collection | blankNodePropertyList
| literal | tripleTerm | reifiedTriple
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 435 def read_object(subject = nil, predicate = nil) prod(:object) do if object = read_iri || read_BlankNode || read_collection || read_blankNodePropertyList || read_literal || read_tripleTerm || read_reifiedTriple add_statement(:object, RDF::Statement(subject, predicate, object)) if subject && predicate object end end end |
#read_objectList(subject, predicate) ⇒ RDF::Term (protected)
Read objectList
objectList ::= object annotation* ( ',' object annotation* )*
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 382 def read_objectList(subject, predicate) prod(:objectList, %{,}) do last_object = nil while object = prod(:_objectList_2) {read_object(subject, predicate)} last_object = object # If object is followed by annotations, read them. read_annotation(subject, predicate, object) break unless @lexer.first === ',' @lexer.shift while @lexer.first === ',' end last_object end end |
#read_predicateObjectList(subject) ⇒ RDF::URI (protected)
Read predicateObjectList
predicateObjectList ::= verb objectList (';' (verb objectList)? )*
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 361 def read_predicateObjectList(subject) prod(:predicateObjectList, %{;}) do last_verb = nil while verb = read_verb last_verb = verb prod(:_predicateObjectList_5) do read_objectList(subject, verb) || error("Expected objectList", production: :predicateObjectList, token: @lexer.first) end break unless @lexer.first === ';' @lexer.shift while @lexer.first === ';' end last_verb end end |
#read_reifiedTriple ⇒ RDF::Term (protected)
Read reifiedTriple
reifiedTriple ::= '<<' (subject | reifiedTriple) predicate object reifier? '>>'
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 457 def read_reifiedTriple return unless @options[:rdfstar] if @lexer.first.value == '<<' prod(:reifiedTriple) do @lexer.shift # eat << subject = read_ttSubject || read_reifiedTriple || error("Failed to parse subject", production: :reifiedTriple, token: @lexer.first) predicate = read_verb || error("Failed to parse predicate", production: :reifiedTriple, token: @lexer.first) object = read_ttObject || read_tripleTerm || read_reifiedTriple || error("Failed to parse object", production: :reifiedTriple, token: @lexer.first) tt = RDF::Statement(subject, predicate, object, tripleTerm: true) # An optional reifier. If not specified it is a new blank node. id = if @lexer.first.value == '~' @lexer.shift read_iri || read_BlankNode end || bnode statement = RDF::Statement(id, RDF.to_uri + 'reifies', tt) add_statement('reifiedTriple', statement) unless @lexer.first.value == '>>' error("Failed to end of triple occurence", production: :reifiedTriple, token: @lexer.first) end @lexer.shift id end end end |
#read_statement (protected)
This method returns an undefined value.
Read objectList
statement ::= directive | triples '.'
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 258 def read_statement prod(:statement, %w{.}) do error("read_statement", "Unexpected end of file") unless token = @lexer.first case token.type when :BASE, :PREFIX read_directive || error("Failed to parse directive", production: :directive, token: token) else read_triples || error("Expected token", production: :statement, token: token) if !log_recovering? || @lexer.first === '.' # If recovering, we will have eaten the closing '.' token = @lexer.shift unless token && token.value == '.' error("Expected '.' following triple", production: :statement, token: token) end end end end end |
#read_subject ⇒ RDF::Resource (protected)
subject ::= iri | BlankNode | collection
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 419 def read_subject prod(:subject) do read_iri || read_BlankNode || read_collection || error( "Expected subject", production: :subject, token: @lexer.first) end end |
#read_triples ⇒ Object (protected)
Read triples
triples ::= subject predicateObjectList | blankNodePropertyList predicateObjectList?
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 335 def read_triples prod(:triples, %w{.}) do error("read_triples", "Unexpected end of file") unless token = @lexer.first case token.type || token.value when '[' # blankNodePropertyList predicateObjectList? subject = read_blankNodePropertyList || error("Failed to parse blankNodePropertyList", production: :triples, token: @lexer.first) read_predicateObjectList(subject) || subject when '<<' subject = read_reifiedTriple || error("Failed to parse reifiedTriple", production: :triples, token: @lexer.first) read_predicateObjectList(subject) || subject else # subject predicateObjectList subject = read_subject || error("Failed to parse subject", production: :triples, token: @lexer.first) read_predicateObjectList(subject) || error("Expected predicateObjectList", production: :triples, token: @lexer.first) end end end |
#read_tripleTerm ⇒ RDF::Statement (protected)
Read triple term
tripleTerm ::= '<<(' ttSubject predicate ttObject ')>>'
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 491 def read_tripleTerm return unless @options[:rdfstar] if @lexer.first.value == '<<(' prod(:tripleTerm) do @lexer.shift # eat <<( subject = read_ttSubject || error("Failed to parse subject", production: :tripleTerm, token: @lexer.first) predicate = read_verb || error("Failed to parse predicate", production: :tripleTerm, token: @lexer.first) object = read_ttObject || error("Failed to parse object", production: :tripleTerm, token: @lexer.first) unless @lexer.first.value == ')>>' error("Failed to end of triple term", production: :tripleTerm, token: @lexer.first) end @lexer.shift statement = RDF::Statement(subject, predicate, object, tripleTerm: true) statement end end end |
#read_ttObject(subject = nil, predicate = nil) ⇒ RDF::Term (protected)
Read ttObject
ttObject::= iri | BlankNode | literal | tripleTerm
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 528 def read_ttObject(subject = nil, predicate = nil) prod(:ttObject) do read_iri || read_BlankNode || read_literal || read_tripleTerm end end |
#read_ttSubject ⇒ RDF::Term (protected)
Read ttSubject
ttSubject::= iri | BlankNode
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 515 def read_ttSubject prod(:ttSubject) do read_iri || read_BlankNode end end |
#read_verb ⇒ RDF::URI (protected)
Read verb
verb ::= predicate | 'a'
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 404 def read_verb if @cached_verb v, @cached_verb = @cached_verb, nil return v end error("read_verb", "Unexpected end of file") unless token = @lexer.first case token.type || token.value when 'a' then prod(:verb) {@lexer.shift && RDF.type} else prod(:verb) {read_iri} end end |
#recover(*args, &block) ⇒ Object (protected)
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# File 'vendor/bundler/ruby/3.3.0/bundler/gems/rdf-turtle-6506e92ccd8e/lib/rdf/turtle/reader.rb', line 742 def recover(*args, &block) lineno = ([:token].lineno if [:token].respond_to?(:lineno)) || (@lexer && @lexer.lineno) opts = args.last.is_a?(Hash) ? args.pop : {} opts[:level] ||= 1 opts[:lineno] ||= lineno log_recover(*args, **opts, &block) end |